Exhibit 10.29

 
December 15, 2009

Mike Johnson
Wachovia Bank, N.A.
Commercial Lending Division, TN1008
230 Fourth Avenue North, Eighth Floor
Nashville, Tennessee 37219

Dear Mike:

Reference is made to that certain Credit Agreement dated as of April 13, 2007
(the “Credit Agreement”) by and between Astec Industries, Inc. (“Astec”) and
Wachovia Bank, National Association (the “Bank”).  Terms used herein and not
defined herein have their respective defined meanings as set forth in the Credit
Agreement.

Pursuant to the definition of “Line of Credit Loan Maturity Date” contained in
the Credit Agreement.  Astec hereby elects to extend the Line of Credit Loan
Maturity Date for a one-year period to May 15, 2012.

Astec hereby certifies to the Bank that, as of the date hereof, no Default or
Event of Default or Material Adverse Change has occurred or is continuing.

I would ask that the Bank kindly acknowledge such extension by signing the
counterpart of this letter at the space provided below.

On behalf of Astec, we appreciate a very professional and positive relationship
that has developed between our two institutions.

Very truly yours,

ASTEC INDUSTRIES, INC.

/s/ F. McKamy Hall        
By:           F. McKamy Hall
V.P., C.F.O. & Treasurer

Acknowledged and agreed:

WACHOVIA BANK, NATIONAL ASSOCIATION

By: /s/Mike Johnson                         
Title: Senior Vice President