# Lean Concrete Base Course

> Project No: \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
>
> Date: \_\_\_\_\_\_\_\_\_
>
> Reviewer: \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
>
> Time Elapsed: \_\_\_\_\_%
>
> Work Completed \_\_\_\_\_%
>
> In Company With: \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

## Specification Requirements

> Slump \_\_\_\_\_ inch to \_\_\_\_\_ inches
>
> Air Content \_\_\_\_\_% to \_\_\_\_\_% (4.5\" ± 1.5)
>
> Cement Content \_\_\_\_\_ sack/CY
>
> Thickness \_\_\_\_\_ inches

+--------------------------+-------------------------------------------+
| Mix Design Strength -    | Type I Cement \_\_\_\_\_ (at 7 days)      |
|                          |                                           |
|                          | Type II Cement \_\_\_\_\_ (at 7 days)     |
+--------------------------+-------------------------------------------+

## References

> Lean Concrete Base Course - - LCB (Sheets 1 through 6)
>
> Portland Cement Concrete Pavement - - PCCP (Sheets 1 through 23)

## Plant Site

1.  Has the contractor\'s mix design been reviewed and approved? Was
    Type I or II cement used in the mix design? (LCB sheets 1 & 3).

2.  Have the stockpiles of aggregate been tested and accepted (not more
    then 7 days before intended use)? (LCB sheet 2).

3.  Is the material passing the No. 40 sieve non plastic? Have the
    gradation limits been achieved (check on variation from trial batch
    gradation-percent)? (LCB sheets 1 & 2).

4.  Have any admixtures other than air-entraining agents been approved
    for use? (LCB sheet 2)

5.  Are there two separate water lines for insertion of water into the
    mixing drum? If used, are water reducing admixtures injected into
    one line and air-entraining agent into the other? (LCB sheet 3, PCCP
    sheet 12).

6.  Is the batch plant equipped with a numerical printout device that
    will make a continuous, permanent, and accurate record of the
    weights of cement, gravel, and sand as well as the amount of water
    and additives used in each batch of concrete with the time of day
    for each batch shown in hours, minutes, and seconds? (LCB sheet 3,
    PCCP sheet 9).

7.  Have the batch plant scales and water meter(s) been certified and
    sealed by the State Department of Agriculture? If so, what date?
    (LCB sheet 3, PCCP sheet 12).

8.  Is the mixing time 80 seconds or greater after all materials are in
    the drum? Has the engineer approved a shorter mixing time (minimum
    of 60 seconds) based on an efficiency test using design mix
    materials? (LCB sheet 3, PCCP sheet 12).

9.  Is the concrete being sampled from the haul trucks with a square
    mouth shovel at the batch plant platform? (LCB sheet 3, PCCP sheet
    7).

10. Have slump and air tests been taken on the first three truck loads
    of concrete produced each morning and the first three truck loads
    produced after shutdown of more than one hour, and any out of
    specification tests will require three consecutive loads to be
    tested and accepted before full operation resumes? (LCB sheet 3,
    PCCP sheet 8).

11. Are additional slump and air tests made on a random basis throughout
    the day by means of random number tables? At what frequency are
    tests made? (LCB sheet 3, PCCP sheet 8).

12. Has the batching operation been slowed down to allow completion of
    each slump and air test before the next batch is made so test
    results can be communicated to the batch plant operator and
    necessary corrections can be made (first three loads)? (LCB sheet 3,
    PCCP sheet 8).

13. Are the trucks used to haul concrete from the batch plant to the
    paver flat bottom end dump with essentially water tight end gates
    and bottoms with rounded inside corners? (LCB sheet 3, PCCP sheet
    9).

## Project Site

1.  Is the lay-down equipment equipped with a control system which will
    automatically control the laying of the materials to the specified
    longitudinal grades? (LCB sheet 3, PCCP sheet 9).

2.  Is the slip-form paver equipped with vibrators meeting the following
    requirements? (LCB sheet 3, PCCP sheet 10).

    a.  Eccentric diameter - - 1 7/8 inch?

    b.  Frequency - - 9,500 vibrations per/minute minimum in concrete or
        equivalent in air?

    c.  Spacing - - 18\" maximum mounted longitudinally?

    d.  Are they operated horizontally at the midpoint of the concrete
        slab and mounted parallel to the direction of paving?

    e.  Is each vibrator equipped with a gauge or other device that will
        indicate whether or not the vibrator is operating? Is the gauge
        or other devices mounted on the paving machine so they can be
        easily seen by the operator and the inspector?

3.  The subbase shall be in a moist condition at the time LCB is placed.
    Has the subbase been thoroughly watered not less than 6 hours prior
    to placing concrete? Has at least 500 feet of subbase been prepared
    ahead of the paver? (LCB sheet 3).

4.  Has the mixed LCB been discharged from non-agitating hauling
    equipment and processed by the initial power lay-down machine within
    35 minutes after introduction of the mixing water to the cement and
    aggregates? (LCB sheet 4, PCCP sheet 12).

5.  Has the LCB been deposited in such a manner as to require as little
    rehandling as possible? (LCB sheet 4, PCCP sheet 13).

6.  Has any water been added to the pavement surface behind the final
    screed on the paver? (LCB sheet 4, PCCP sheet 13).

7.  Is the LCB surface being checked with a straight edge, chalk-line or
    profilograph to see if the 3/8 inch in 10 feet deviation is being
    met? Are the areas that are high in excess of 1/4 inch being
    recorded or marked for grinding? (LCB sheet 4).

8.  Is the entire exposed area, including sides and edges, of the LCB
    being cured by uniformly spraying with two applications of curing
    compound at a rate of not less than one gallon per 160 SF of surface
    per application? Does the curing compound conform to AASHTO
    Designation M-148, Type II, white pigmented, with wax base? (LCB
    sheets 2 & 4). How is the application rate being monitored?

9.  Is the first application of curing compound being placed as soon as
    the finishing operations have been completed? (LCB sheet 4)

10. Has curing compound been applied with mechanical sprayers of the
    fully atomizing type and are they provided with a hood to protect
    the spray from the wind? (LCB sheet 4).

11. Has traffic or the contractor\'s equipment been permitted on the LCB
    before a period of at least 72 hours has elapsed after placing? (LCB
    sheet 4).

12. Have the core thickness values been plotted on graph paper showing
    thickness values per 12,000 SF areas? Have there been any deficient
    areas of LCB? If so, have the appropriate price adjustments been
    assessed? (LCB sheet 5 & 6).