Document:

Exhibit
10.6

    

    SHELL
COMPANY PURCHASE AGREEMENT

    

    THIS
SHELL COMPANY PURCHASE AGREEMENT (this “Agreement”), is dated as of Dec.8, 2007,
by and between Sinary Bio-Technology Holdings Group, Inc. (Party
A) and Wangyin,CEO of Weikang (Party B)

    

    WHEREAS, the share exchange
agreement between Party A and EXDG.OB as of Dec.7,2007. Party A should pay
650,000 US dollar.

     

    AGREEMENT:

     

    NOW, THEREFORE, in
consideration of the mutual covenants and other agreements contained in this
Agreement, both parties hereby agree as follows:

    

    
      	
            	
              1、

            	
               The
      payment of $650,000 will made by Mr.Wangyin,CEO of Heilongjiang Weikang on
      behalf of Sinary in connection with the reverse acquisition  on
      December 7, 2007. 

            

    

    

    
      	
            	
              2、

            	
              Part
      B will remit the fee to the account the investment bank offered when the
      agreement is in effective.

            

    

    

    
      	
            	
              3、

            	
              Payment: All payment
      is made in US dollar.

            

    

    

    
      	
            	
              4、

            	
              The
      agreement shall become effective as of the day when the Assignor and the
      Assignee have affixed their signatures on it.

            

    

    

    Part
A:Signature
of Wangweili   CEO of Sinary

    Part
B:Signature
of Wangyin    CEO of WeikangExhibit
10.7

    

    
      
        
          
            
              
                
                  
                    
                      	
                              Land
      use right cert

                            
	
                              owner

                            	 	
                              address

                            	 	
                              meters

                            
	
                              Tianfang
      (Guizhou)Pharmaceutical Inc.,

                            	 	
                              Zhenzhu
      Jingpian Area,Zhazuo Town,Xiuwen County,

                            	 	
                              71907.03     square
      meter

                            
	
                              Real
      estate cert

                            
	
                              owner

                            	 	
                              address

                            	 	
                              meters

                            
	
                              Tianfang
      (Guizhou)Pharmaceutical Inc.,

                            	 	
                              Zhenzhu
      Jingpian Area, Zhazuo Town,Xiuwen County,

                            	 	
                              188.7        square
      meter

                            
	
                              Tianfang
      (Guizhou)Pharmaceutical Inc.,

                            	 	
                              Zhenzhu
      Jingpian Area, Zhazuo Town,Xiuwen County,

                            	 	
                              116.61       square
      meter

                            
	
                              Tianfang
      (Guizhou)Pharmaceutical Inc.,

                            	 	
                              Zhenzhu
      Jingpian Area, Zhazuo Town,Xiuwen County,

                            	 	
                              27.85        square
      meter

                            
	
                              Tianfang
      (Guizhou)Pharmaceutical Inc.,

                            	 	
                              Zhenzhu
      Jingpian Area, Zhazuo Town,Xiuwen County,

                            	 	
                              22.60        square
      meter

                            
	
                              Tianfang
      (Guizhou)Pharmaceutical Inc.,

                            	 	
                              Zhenzhu
      Jingpian Area, Zhazuo Town,Xiuwen County,

                            	 	
                              142.48       square
      meter

                            
	
                              Tianfang
      (Guizhou)Pharmaceutical Inc.,

                            	 	
                              Zhenzhu
      Jingpian Area, Zhazuo Town,Xiuwen County,

                            	 	
                              1590.2       square
      meter

                            
	
                              Tianfang
      (Guizhou)Pharmaceutical Inc.,

                            	 	
                              Zhenzhu
      Jingpian Area, Zhazuo Town,Xiuwen County,

                            	 	
                              1342.26      square
      meter

                            
	
                              Tianfang
      (Guizhou)Pharmaceutical Inc.

                            	 	
                              Zhenzhu
      Jingpian Area, Zhazuo Town,Xiuwen County,

                            	 	
                              1815.44      square
      meter

                            
	
                              Tianfang
      (Guizhou)Pharmaceutical Inc.

                            	 	
                              Zhenzhu
      Jingpian Area, Zhazuo Town,Xiuwen County,

                            	 	
                              6943.71      square
      meter

                            

                    

                  

                

              

            

          

        

      

    

    

    Issued
to: Tianfang (Guizhou) Pharmaceutical Co., Ltd.

    

    Expires:
December 9, 2051

    

    (seal)
Xiuwen County Land Bureau

    (seal)
Bureau of Real Estate Management of Guiyang CityExhibit
10.8

    

    
      
        
          
            
              
                	
                        Land
      right cert

                      
	
                        owner

                      	 	
                        address

                      	 	
                        meters

                      
	
                        Heilongjiang
      Weikang Bio-tech Group

                      	 	
                        Economic
      development zone of Shuangcheng City

                      	 	
                        38988     square
      meter

                      
	
                        Real
      Estate cert

                      
	
                        Heilongjiang
      Weikang Bio-tech Group

                      	 	
                        Economic
      development zone of Shuangcheng City

                      	 	
                        46.24     square
      meter

                      
	
                        Heilongjiang
      Weikang Bio-tech Group

                      	 	
                        Economic
      development zone of Shuangcheng City

                      	 	
                        2113.19   square
      meter

                      
	
                        Heilongjiang
      Weikang Bio-tech Group

                      	 	
                        Economic
      development zone of Shuangcheng City

                      	 	
                        46.24     square
      meter

                      
	
                        Heilongjiang
      Weikang Bio-tech Group

                      	 	
                        Economic
      development zone of Shuangcheng City

                      	 	
                        1951.04   square
      meter

                      
	
                        Heilongjiang
      Weikang Bio-tech Group

                      	 	
                        Economic
      development zone of Shuangcheng City

                      	 	
                        646.46    square
      meter

                      
	
                        Heilongjiang
      Weikang Bio-tech Group

                      	 	
                        Economic
      development zone of Shuangcheng City

                      	 	
                        2294.97   square
      meter

                      
	
                        Heilongjiang
      Weikang Bio-tech Group

                      	 	
                        Economic
      development zone of Shuangcheng City

                      	 	
                        1951.04   square
      meter

                      

              

            

          

        

      

    

     

    Weikang

    

    Issued
to: Heilongjiang Weikang Bio-Technology Group

    

    Expires:
April 8, 2055

    

    (seal)
Bureau of Land and Resources of Shuang-Cheng CityUnassociated Document

    Exhibit 10.1

     

    EXECUTION
VERSION

    

    AMENDMENT
NO. 5 TO AMENDED AND RESTATED CREDIT AGREEMENT

    

    This
Amendment No. 5 to the Amended and Restated Credit Agreement, dated as of March
24, 2010 (this “Amendment”), by and
among U.S. Concrete, Inc., a Delaware corporation (the “Borrower”) and the
Lenders party hereto.

    

    Preliminary
Statements

    

    Capitalized
terms defined in the Credit Agreement (as defined below) and not otherwise
defined in this Amendment are used herein as therein defined.

    

    The
Borrower, the Lenders, the Issuers, Citicorp North America, Inc., as agent for
the Lenders and the Issuers and as agent for the Secured Parties under the
Collateral Documents (in such capacity, the “Administrative
Agent”), Bank of America, N.A., in its capacity as syndication agent for
the Lenders and the Issuers (the “Syndication Agent”)
and JPMorgan Chase Bank, N.A., in its capacity as documentation agent for the
Lenders and the Issuers (the “Documentation Agent”)
are parties to that certain Amended and Restated Credit Agreement dated as of
June 30, 2006 (as the same has been amended by Amendment No. 1 dated March 1,
2007, Amendment No. 2 dated November 6, 2007, Amendment No. 3 dated July 11,
2008 and Amendment No. 4 dated February 19, 2010, and has been otherwise
amended, supplemented or modified from time to time, the “Credit
Agreement”).

    

    The
Borrower has requested that the Lenders agree to amend certain provisions of the
Credit Agreement as more fully set forth herein.

    

    The
parties hereto agree to amend the Credit Agreement subject to the conditions set
forth herein.

    

    SECTION
1.                                Amendments. Subject
to the satisfaction of the conditions precedent set forth in Section 2 hereof,
the Credit Agreement is hereby amended as follows:

    

    (a)                 Section
1.1(Defined Terms) is hereby amended as follows:

     

    (i)           by
adding thereto in the appropriate alphabetical order the following
definitions:

    

    “Fifth Amendment” means that
certain Amendment No. 5 to this Agreement, dated as of March 24,
2010.

    

    “Fifth Amendment Effective
Date” means March 24, 2010.

    

    “Mortgage” has the meaning
specified in the Fifth Amendment.

    

    “Quarry” means the aggregates
quarry owned by Eastern Concrete Materials, Inc. (“EMI”) located in Hamburg, New
Jersey and any equipment or other assets of EMI used in the operation of such
quarry in the ordinary course of business and consistent with past practice,
together with any proceeds and products of any of the foregoing (including
Accounts and intangible assets pertaining thereto).

    

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

     

    (ii)           by
amending and restating the definition of “Applicable Amount” in its entirety as
follows:

    “Applicable Amount” means, (i)
from and after the Fifth Amendment Effective Date until the earlier to occur of
(A) April 30, 2010 and (B) the Borrower making the interest payment (or any
portion thereof) due on April 1, 2010 (or giving any notice of its intent to
make such a payment) with respect to the New Notes, $1,500,000 and (ii)
thereafter, $25,000,000.

    

    (iii)           by
amending and restating the definition of “Applicable Margin” in its entirety as
follows:

    “Applicable Margin” means,
with respect to Revolving Loans maintained as (i) Base Rate Loans, a rate equal
to 4.25% per annum and (ii) Eurodollar Rate Loans, a rate equal to 5.25% per
annum.

     

    (iv)           by
amending the definition of “Base Rate” adding the following proviso to the end
thereof:

    

    ;provided that
notwithstanding the foregoing, in no event shall the Base Rate be less than
3.00% per annum.

    

    (v)           by
amending and restating the definition of “Collateral Documents” in its entirety
as follows:

    

    “Collateral Documents” means
the Pledge and Security Agreement, the Deposit Account Control Agreements, the
Securities Account Control Agreements, the Mortgages and any other document
executed and delivered by a Loan Party granting a Lien on any of its property to
secure payment of the Secured Obligations.

     

    (vi)           by
amending the definition of “Eurodollar Rate” by adding the following proviso to
the end thereof:

    

    ;provided that
notwithstanding the foregoing, in no event shall the Eurodollar Rate be less
than 2.00% per annum.

    

    (vii)           by
amending and restating the definition of “Excluded Collateral” in its entirety
as follows:

    

    “Excluded Collateral means (a)
the equity interests of the Excluded Joint Venture (the “Excluded Equity”), (b) the
assets owned by the Excluded Joint Venture (the “Excluded JV Assets”), (c) any
real estate assets leased by the Borrower and its Subsidiaries (the “Leasehold Interests”) and (d)
any real estate assets owned by the Borrower and its Subsidiaries with a net
book value of less than $100,000.

     

    (viii)           by
amending and restating the final sentence of the definition of “Revolving Credit
Commitment” in its entirety as follows:

     

    The
aggregate amount of the Revolving Credit Commitments as of the Fifth Amendment
Effective Date is $60,000,000.

     

    
      
        
        

      

      
        2

        
          

        

      

      
        
        

      

    

     

    (b)                 Section
2.10(c) (Interest) is hereby amended by adding the following proviso at the end
of the first sentence thereof:

    

    (the
“Default Rate”),
provided, that for so long as such Event of Default shall be continuing, the
Default Rate shall increase by an additional 1.0% at the end of each successive
30-day period.

    

    (c)                 Section
7.11(b) (Additional Collateral and Guaranties) is hereby amended by adding at
the end of the proviso in the eleventh line thereof “except to the extent
required by the Fifth Amendment”.

    

    (d)                 Section
7.13 (Real Property) is hereby amended by deleting the text of clause (b)
thereof in its entirety and substituting the phrase “Intentionally Omitted”
therefor.

    

    (e)                 Section
8.1(Indebtedness) is hereby amended by adding the following new paragraph at the
end thereof:

    

    Notwithstanding
anything herein to the contrary, the Borrower shall not, nor shall it permit any
of its Subsidiaries to, directly or indirectly create, incur, assume or
otherwise become directly or indirectly liable with respect to any Indebtedness
after the Fifth Amendment Effective Date, except (i) as permitted with the
consent of the Requisite Lenders, (ii) Indebtedness permitted pursuant to
clauses (a) and (g) above, (iii) unsecured Indebtedness resulting from the
conversion of trade payables and (iv) other Indebtedness incurred in the
ordinary course of business in an aggregate principal amount not to exceed
$1,000,000.

     

    SECTION
2.                                Conditions to
Effectiveness. This Amendment shall become effective on the date when
each of the following conditions precedent have first been satisfied or waived
in writing by the Requisite Lenders (the “Effective
Date”):

    

    (a)                 Certain
Documents. The Lenders shall have received counterparts of each of the
following, each dated the Effective Date (unless otherwise agreed by the
Requisite Lenders), in form and substance reasonably satisfactory to the
Requisite Lenders:

     

    (i)           this
Amendment executed by the Borrower and the Requisite Lenders;

     

    (ii)           a
consent and reaffirmation in respect of this Amendment in the form attached
hereto, executed by each Guarantor;

     

    (iii)           a
certificate of the Secretary or an Assistant Secretary of each Loan Party
certifying (A) the names and true signatures of each officer of such Loan Party
that has been authorized to execute and deliver this Amendment and/or the
attached Reaffirmation and Consent of Guarantors or other document required
hereunder to be executed by or on behalf of such Loan Party and (B) the
resolutions of such Loan Party’s Board of Directors (or equivalent governing
body) approving and authorizing the execution, delivery and performance of this
Amendment and/or the attached Reaffirmation and Consent of Guarantors and the
other documents required hereunder to be executed by or on behalf of such Loan
Party; and

     

    (iv)           
a certificate from a Responsible Officer of the Borrower certifying that the
representations and warranties set forth in Section 6 of this Amendment are true
and correct in all material respects as of the Effective Date.

     

    
      
        
        

      

      
        3

        
          

        

      

      
        
        

      

    

    

    (b)                 Certain
Collateral Documents.  The Lenders shall have received counterparts of
each of the following, each dated on or before the Effective Date, in form and
substance reasonably satisfactory to the Requisite Lenders:

     

    (i)           a
mortgage, deed of trust or other applicable real estate security document with
respect to the Quarry and each other Real Property owned by a Loan Party with a
net book value equal to or greater than $100,000 including, without limitation,
those properties listed on Schedule II hereto (each such other Real Property, a
“Specified Real
Property”) (such mortgages, deeds of trust and other real estate security
documents being collectively referred to herein as the “Mortgages”);

     

    (ii)           an
opinion of counsel in the state in which the Mortgage for the Quarry is to be
recorded;

     

    (iii)           
for the Quarry (x) a mortgagee’s title policy (or policies) or marked-up
unconditional binder (or binders) for such insurance (a “Mortgagee’s Title Insurance
Policy”), which shall (A) be issued at ordinary rates, (B) insure that
the Lien granted pursuant to the Mortgage insured thereby creates a valid first
Lien on the Quarry free and clear of all defects and encumbrances, except for
Customary Permitted Liens, (C) name the Administrative Agent for the benefit of
the Secured Parties as the insured thereunder, (D) be in the form of the ALTA
Loan Policy – 2006 (or equivalent policies), (E) contain the appropriate
endorsements and (F) be issued by one or more national title insurance companies
(including any such title companies acting as co-insurers or reinsurers) and (y)
a copy of all documents referred to, or listed as exceptions to title, in such
title policy (or policies);

     

    (iv)           for
the Quarry, evidence that all premiums in respect of each Mortgagee’s Title
Insurance Policy, all recording fees and stamp, documentary, intangible or
mortgage taxes, if any, in connection with the Mortgage have been paid or
delivered to the title company to pay;

     

    (v)           for
the Quarry and each Specified Real Property, a certification from the Federal
Emergency Management Agency as to whether such Real Property is located in a
floodplain;

     

    (vi)           if
available and in possession of the Borrower, a Phase I environmental report with
respect to the Quarry and each parcel of Specified Real Property, showing no
material condition of environmental concern;

     

    (vii)           if
available and in possession of the Borrower, a survey with respect to the Quarry
and each parcel of Specified Real Property; and

     

    (viii)           such
other agreements, documents and instruments as the Requisite Lenders deem
reasonably necessary to create, register or otherwise perfect, maintain,
evidence the existence, substance, form or validity of, or enforce a valid and
enforceable first priority Lien on the Quarry and each parcel of Specified Real
Property in favor of the Administrative Agent for the benefit of the Secured
Parties (or in favor of such other trustee as may be required under local law)
subject only to Customary Permitted Liens.

     

    Notwithstanding
anything herein to the contrary, the conditions specified in this Section 2
shall be deemed satisfied upon acceptance of this Amendment by the Requisite
Lenders.

    

    
      
        
        

      

      
        4

        
          

        

      

      
        
        

      

    

     

    SECTION
3.                                Additional
Covenants.

    

    (a)                 After
the Effective Date, and prior to the earlier of (x) April 30, 2010 and (y) the
occurrence of an Event of Default, the Lenders agree (on a several and not joint
basis) to use their commercially reasonable efforts not to incur any costs or
expenses associated with any financial advisor in connection with the matters
and transactions contemplated by the terms and conditions of the Credit
Agreement (including this Amendment);

     

    (b)                 No
later than March 31, 2010 (unless otherwise agreed by the Requisite Lenders),
the Lenders shall have received an opinion of counsel in each state in which the
Mortgages for the Specified Real Properties are to be recorded in form and
substance reasonably satisfactory to the Requisite Lenders;

     

    (c)                 Notwithstanding
anything to the contrary in the Credit Agreement, the Lenders agree not to
exercise any right of set-off against any Loan Party without the prior written
consent of the Requisite Lenders; and

     

    (d)                 Within
30 days following the Effective Date (unless otherwise agreed by the Requisite
Lenders), the Lenders shall have received counterparts of each of the following
in form and substance reasonably satisfactory to the Requisite
Lenders:

     

    (i)           for
each Specified Real Property with a net book value equal to or greater than
$700,000 (x) a Mortgagee’s Title Insurance Policy, which shall (A) be issued at
ordinary rates, (B) insure that the Lien granted pursuant to the Mortgage
insured thereby creates a valid first Lien on such parcel of Specified Real
Property free and clear of all defects and encumbrances, except for Customary
Permitted Liens, (C) name the Administrative Agent for the benefit of the
Secured Parties as the insured thereunder, (D) be in the form of the ALTA Loan
Policy – 2006 (or equivalent policies), (E) contain the appropriate endorsements
and (F) be issued by one or more national title insurance companies (including
any such title companies acting as co-insurers or reinsurers) and (y) a copy of
all documents referred to, or listed as exceptions to title, in such title
policy (or policies); and

     

    (ii)           for
each Specified Real Property with a net book value equal to or greater than
$700,000, evidence that all premiums in respect of each Mortgagee’s Title
Insurance Policy, all recording fees and stamp, documentary, intangible or
mortgage taxes, if any, in connection with the Mortgage have been
paid.

     

    SECTION
4.                                Construction with the Loan
Documents.

    

    (a)                 
On and after the Effective Date, each reference in the Credit Agreement to “this
Agreement,” “hereunder,” “hereof,” “herein,” or words of like import, and each
reference in the other Loan Documents to the Credit Agreement, shall mean and be
a reference to the Credit Agreement as amended and waived hereby, and this
Amendment and the Credit Agreement shall be read together and construed as a
single instrument. The table of contents, signature pages and list of Exhibits
and Schedules of the Credit Agreement shall be deemed modified to reflect the
changes made by this Amendment.

     

    (b)                 Except
as expressly amended or waived hereby, all of the terms and provisions of the
Credit Agreement and all other Loan Documents are and shall remain in full force
and effect and are hereby ratified and confirmed, including the respective
guarantees and security interests granted pursuant to the respective Loan
Documents.

     

    
      
        
        

      

      
        5

        
          

        

      

      
        
        

      

    

     

    (c)                 The
execution, delivery and effectiveness of this Amendment shall not, except as
expressly provided herein, operate as a waiver of any right, power or remedy of
the Lenders, the Issuers, or the Agents under any of the Loan Documents, nor
constitute a waiver or amendment of any provision of any of the Loan Documents
or for any purpose except as expressly set forth herein.

     

    (d)                 This
Amendment is a Loan Document.

     

    (e)                 This
Amendment shall not extinguish, discharge or release the Lien or priority of any
Loan Document or any other security therefor or any guarantee thereof. The
Credit Agreement and each of the other Loan Documents shall remain in full force
and effect, except as modified or waived hereby in connection
herewith.

     

    SECTION
5.                                 Governing Law. This
Amendment is governed by, and shall be construed in accordance with, the law of
the State of New York.

    

    SECTION
6.                                Representations and
Warranties. The Borrower hereby represents and warrants that on the
Effective Date:

    

    

    (a)                 Each
of the representations and warranties made by it in the Credit Agreement, as
amended and waived hereby, and the other Loan Documents to which it is a party,
are true and correct in all material respects on and as of the date hereof
(other than representations and warranties in any such Loan Document which
expressly speak as of a specific date, which shall have been true and correct in
all material respects as of such specific date) and no Default or Event of
Default has occurred and is continuing as of the date hereof.

    

    (b)                 This
Amendment has been duly executed and delivered by each Loan Party party thereto
and constitutes a legal, valid and binding obligation of such Loan Party,
enforceable in accordance with its terms, subject to applicable bankruptcy,
insolvency, reorganization, moratorium or other laws affecting creditors’ rights
generally and subject to general principles of equity, regardless of whether
considered in a proceeding in equity or at law.

     

    (c)                 Execution
and delivery by the Borrower of this Amendment, and consummation of the
transactions contemplated hereby and thereby, (i) do not require any consent or
approval of, registration or filing with, or any other action by, any
Governmental Authority, except such as have been obtained or made and are in
full force and effect, (ii) will not violate the Constituent Documents of any
Loan Party, (iii) will not violate any Requirement of Law, (iv) conflict with or
result in the breach of, or constitute a default under, or result in or permit
the termination or acceleration of, any Related Document or any other material
Contractual Obligation of the Borrower or any of its Subsidiaries, and (v) will
not result in the creation or imposition of any Lien on any property of any Loan
Party, except Liens created by the Loan Documents or otherwise permitted by
Section 8.2 of the Credit Agreement.

     

    SECTION
7.                                Execution in
Counterparts. This Amendment may be executed in any number of
counterparts and by different parties in separate counterparts, each of which
when so executed shall be deemed to be an original and all of which taken
together shall constitute one and the same agreement. Signature pages may be
detached from multiple separate counterparts and attached to a single
counterpart so that all signature pages are attached to the same document.
Delivery of an executed counterpart by telecopy or electronic transmission shall
be effective as delivery of a manually executed counterpart of this
Amendment.

    

    SECTION
8.                                Updated Schedule I
(Commitments). The parties hereto agree that (i) Schedule I (Commitments)
attached hereto reflects the Revolving Credit Commitments as of the Fifth
Amendment Effective Date and (ii) the aggregate amount of the Revolving Credit
Commitments on the Fifth Amendment Effective Date is $60,000,000.

    

    
      
        
        

      

      
        6

        
          

        

      

      
        
        

      

    

     

    SECTION
9.                                Release. In further
consideration of the Lenders’ execution of this Amendment, the Borrower
unconditionally and irrevocably acquits and fully forever releases and
discharges each Lender, each Issuer, the Administrative Agent, the Syndication
Agent, the Documentation Agent and all affiliates, partners, subsidiaries,
officers, employees, agents, attorneys, principals, directors and shareholders
of such Persons, and their respective heirs, legal representatives, successors
and assigns (collectively, the “Releasees”) from any
and all claims, demands, causes of action, obligations, remedies, suits, damages
and liabilities of any nature whatsoever, whether now known, suspected or
claimed, whether arising under common law, in equity or under statute, which the
Borrower ever had or now has against any of the Releasees (a) which may have
arisen at any time prior to the date hereof and (b) which were in any manner
related to this Amendment, the Credit Agreement, any other applicable Loan
Document or related documents, instruments or agreements or the enforcement or
attempted or threatened enforcement by any of the Releasees of any of their
respective rights, remedies or recourse related thereto (collectively, the
“Released
Claims”). The Borrower covenants and agrees never to commence,
voluntarily aid in any way, prosecute or cause to be commenced or prosecuted
against any of the Releasees any action or other proceeding based upon any of
the Released Claims.

    

    SECTION
10.                                Perfection
of Additional Collateral.  The parties hereto
acknowledge that perfection of the Administrative Agent's Lien in certain
Collateral, including, without limitation, real property and improvements thereto, is
ongoing, but the Borrower and the other Loan Parties continue to execute such
documents, agreements and instruments in connection therewith in accordance with
Sections 7.11 and 7.13 of the Credit Agreement (as modified by this Amendment) and the other Loan
Documents.  The Borrower agrees that any perfection of Liens described
in the preceding sentence that occurs between the date hereof and April 30, 2010
is intended to have occurred substantially contemporaneously with the Fifth Amendment Effective
Date.

    

    [Signature
Pages Follow]

    

    
      
        
        

      

      
        7

        
          

        

      

      
        
        

      

    

    

                  IN
WITNESS WHEREOF, the parties hereto have caused this Amendment to be executed by
their respective officers thereunto duly authorized, as of the date first above
written.

    

    
      
        	 	U.S. CONCRETE, INC., as
      Borrower	 
	 	 	 	 
	
                 

              	
                By:
      

              	/s/ Robert
      D. Hardy	 
	 	 	Name:
      Robert D. Hardy	 
	 	 	Title:
      Executive
      Vice President and Chief Financial Officer	 
	 	 	 	 

      

     

    
      
        
        

      

      
        8

        
          

        

      

      
        
        

      

    

     

    
      

      
        
          	 	JPMORGAN CHASE BANK,
      N.A., as Documentation Agent and Lender	 
	 	 	 	 
	
                   

                	
                  By:
      

                	/s/ Thomas
      Vertin	 
	 	 	Name:
      Thomas Vertin	 
	 	 	Title:
      Senior Vice President	 
	 	 	 	 

        

      
        
          
          

        

        
          9

          
            

          

        

        
          
          

        

      

    

    

    
      

      
        
          	 	CITICORP NORTH AMERICA,
      INC.	 
	 	 	 	 
	
                   

                	
                  By:
      

                	/s/ Matthew
      Paquin	 
	 	 	Name:
      Matthew Paquin	 
	 	 	Title:
      Vice President and Director	 
	 	 	 	 

        

      
        
          
          

        

        
          10

          
            

          

        

        
          
          

        

      

    

    
      

      
        
          	 	
                  BANK
      OF AMERICA, N.A.

                	 
	 	 	 	 
	
                   

                	
                  By:
      

                	/s/ John
      Todd	 
	 	 	Name:
      John Todd	 
	 	 	Title:
      Executive Vice President	 
	 	 	 	 

        

         

         

        
          
            
            

          

          
            11

            
              

            

          

          
            
            

          

        

      

    

    

    
      

      
        
          	 	
                  
                    BRANCH
      BANKING & TRUST CO.

                  

                	 
	 	 	 	 
	
                   

                	
                  By:
      

                	/s/ Cory
      Boyte	 
	 	 	Name:
      Cory Boyte	 
	 	 	Title:
      Senior Vice President	 
	 	 	 	 

        

         

         

        
          
            
            

          

          
            12

            
              

            

          

          
            
            

          

        

      

    

     

    
      

      
        
          	 	
                  CAPITAL
      ONE, N.A.

                	 
	 	 	 	 
	
                   

                	
                  By:
      

                	/s/ Emily
      Lapse	 
	 	 	Name:
      Emily Lapse	 
	 	 	Title:
      Vice President	 
	 	 	 	 

        

         

         

        
          
            
            

          

          
            13

            
              

            

          

          
            
            

          

        

      

    

     

    
      

      
        
          	 	
                  COMERICA
      BANK

                	 
	 	 	 	 
	
                   

                	
                  By:
      

                	/s/ Sarah
      R. Miller	 
	 	 	Name:
      Sarah R. Miller	 
	 	 	Title:
      Vice President	 
	 	 	 	 

        

      

    

     

    
      
        
        

      

      
        14

        
          

        

      

      
        
        

      

    

    

    CONSENT
AND REAFFIRMATION OF GUARANTORS

    

    Dated as
of March 24, 2010

    

    

    Each of
the undersigned, as a Guarantor under the Guaranty, dated as of March 12, 2004
(the “Guaranty”), and as a
Loan Party under each Collateral Document to which it is a party, hereby
consents to that certain Amendment No. 5 to the Amended and Restated Credit
Agreement dated as of the date hereof and to which this consent and
reaffirmation is attached (the “Amendment”) and
hereby confirms and agrees that, notwithstanding the effectiveness of the
Amendment, the Guaranty and all Liens granted by it pursuant to the Collateral
Documents are, and shall continue to be, in full force and effect and are hereby
ratified and confirmed in all respects, except that, on and after the
effectiveness of the Amendment, each reference in the Guaranty and such
Collateral Documents to the “Credit Agreement”, “thereunder”, “thereof” or words
of like import shall mean and be a reference to the Credit Agreement, as amended
by the Amendment.

    

    [Signature
Pages Follow]

     

     

    
      
        
        

      

      
        15

        
          

        

      

      
        
        

      

    

     

    
      
        
          
            
              	 
      	
                      ALBERTA
      INVESTMENTS, INC.

                    
	 
      	
                      ALLIANCE
      HAULERS, INC.

                    
	 
      	
                      AMERICAN
      CONCRETE PRODUCTS, INC.

                    
	 
      	
                      ATLAS
      REDI-MIX, LLC

                    
	 
      	
                      ATLAS-TUCK
      CONCRETE, INC.

                    
	 
      	
                      BEALL
      CONCRETE ENTERPRISES, LLC

                    
	 
      	
                      BEALL
      INDUSTRIES, INC.

                    
	 
      	
                      BEALL
      MANAGEMENT, INC.

                    
	 
      	
                      BUILDERS’
      REDI-MIX, LLC

                    
	 
      	
                      BWB,
      INC. OF MICHIGAN

                    
	 
      	
                      CENTRAL
      CONCRETE SUPPLY CO., INC.

                    
	 
      	
                      CENTRAL
      PRECAST CONCRETE, INC.

                    
	 
      	
                      HAMBURG
      QUARRY LIMITED LIABILITY COMPANY

                    
	 
      	
                      INGRAM
      CONCRETE, LLC

                    
	 
      	
                      MG,
      LLC

                    
	 
      	
                      REDI-MIX
      CONCRETE, L.P.

                    
	 
      	
                      REDI-MIX
      GP, LLC

                    
	 
      	
                      REDI-MIX,
      LLC

                    
	 
      	
                      SAN
      DIEGO PRECAST CONCRETE, INC.

                    
	 
      	
                      SIERRA
      PRECAST, INC.

                    
	 
      	
                      SMITH
      PRE-CAST, INC.

                    
	 
      	
                      SUPERIOR
      CONCRETE MATERIALS, INC.

                    
	 
      	
                      U.S.
      CONCRETE ON-SITE, INC.

                    
	 
      	
                      USC
      MANAGEMENT CO., LLC

                    
	 
      	
                      USC
      PAYROLL, INC.

                    
	 
      	
                      USC
      TECHNOLOGIES, INC.

                    
	 	 
	 	 
	 	 

            

             

            
              	 	 	 
	 	 	 	 
	
                       

                    	
                      By:
      

                    	/s/ Curt
      M. Lindeman	 
	 	 	Name:
      Curt M. Lindeman	 
	 	 	Title:
      Vice President and Secretary	 
	 	 	 	 

            

          

        

      

    

    
       

      
        	 	
                KURTZ
      GRAVEL COMPANY

                SUPERIOR
      HOLDINGS, INC.

                TITAN
      CONCRETE INDUSTRIES, INC.

              	 
	 	 	 	 
	
                 

              	
                By:
      

              	/s/ Robert
      D. Hardy	 
	 	 	Name:
      Robert D. Hardy	 
	 	 	Title:
      Vice President and Secretary	 
	 	 	 	 

        
           

          
            	 	
                    BRECKENRIDGE
      READY MIX, INC.

                  	 
	 	 	 	 
	
                     

                  	
                    By:
      

                  	/s/ Robert
      D. Hardy	 
	 	 	Name:
      Robert D. Hardy	 
	 	 	Title:
      Vice President	 
	 	 	 	 

          

        

         

        
          
            
            

          

          
            16

            
              

            

          

          
            
            

          

        

      

    

     

    
      
        
          
            	 	RIVERSIDE MATERIALS,
      LLC	 
	 	 	 	 
	
                     

                  	
                    By:
      

                  	/s/ Robert
      D. Hardy	 
	 	 	Name:
      Robert D. Hardy	 
	 	 	Title:
      Vice President	 
	 	 	 	 

          

        

        
           

          
            
              
                
                  	 	EASTERN CONCRETE
      MATERIALS, INC.	 
	 	 	 	 
	
                           

                        	
                          By:
      

                        	/s/ Robert
      D. Hardy	 
	 	 	Name:
      Robert D. Hardy	 
	 	 	Title:
      President and Secretary	 
	 	 	 	 

                

              

              
                
                   

                  
                    
                      
                        
                          	 	LOCAL CONCRETE SUPPLY
      & EQUIPMENT, LLC

                                  MASTER
      MIX CONCRETE, LLC

                                  MASTER
      MIX, LLC

                                  NYC
      CONCRETE MATERIALS, LLC

                                  PEBBLE
      LANE ASSOCIATES, LLC

                                	 
	 	 	 	 
	
                                   

                                	
                                  By:
      

                                	/s/ Curt
      M. Lindeman	 
	 	 	Name:
      Curt M. Lindeman	 
	 	 	Title:
      President and Secretary	 
	 	 	 	 

                        

                      

                                                                                      

                    

                  

                

              

            

          

        

      

    

    
      
        
          
            
              
                	 	CONCRETE XXXIII
      ACQUISITION, INC.

                        CONCRETE
      XXXIV ACQUISITION, INC.

                        CONCRETE
      XXXV ACQUISITION, INC.

                        CONCRETE
      XXXVI ACQUISITION, INC.

                      	 
	 	 	 	 
	
                         

                      	
                        By:
      

                      	/s/ Curt
      M. Lindeman	 
	 	 	Name:
      Curt M. Lindeman	 
	 	 	Title:
      President and Secretary	 
	 	 	 	 

              

            

            
              
                
                  
                    
                      
                        
                          	 	
                                  CONCRETE
      ACQUISITION III, LLC 

                                    CONCRETE
      ACQUISITION IV, LLC

                                    CONCRETE
      ACQUISITION V, LLC

                                    CONCRETE
      ACQUISITION VI, LLC

                                  

                                	 
	 	 	 	 
	
                                   

                                	
                                  By:
      

                                	/s/ Curt
      M. Lindeman	 
	 	 	Name:
      Curt M. Lindeman	 
	 	 	Title:
      President 	 
	 	 	 	 

                        

                      

                       

                    

                  

                

              

            

             

            
              
                
                

              

              
                17

                
                  

                

              

              
                
                

              

               

              
                	
                      
	 	 	 	 

                
                  
                    
                      
                        
                          
                            
                              	 	
                                      
                                        USC
      ATLANTIC, INC.

                                      

                                    	 
	 	 	 	 
	
                                       

                                    	
                                      By:
      

                                    	/s/ Sean
      M. Gore	 
	 	 	Name:
      Sean M. Gore	 
	 	 	Title:
      Vice President and Secretary	 
	 	 	 	 

                            

                          

                        

                      

                    

                  

                

              

               

              
                 

                
                  	
                        
	 	 	 	 

                  
                    
                      
                        
                          
                            
                              
                                	 	USC MICHIGAN,
    INC.	 
	 	 	 	 
	
                                         

                                      	
                                        By:
      

                                      	/s/ Michael
      W. Harlan	 
	 	 	Name:
      Michael W. Harlan	 
	 	 	Title:
      Vice President and Secretary

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