TranSystems Corporation - LGM Construction

501070099 Federal Express Oakland Sort Expansion Issued for Bid 10/11
1. Air-Entraining Admixture: ASTM C 260. Add to the mixer in the amount necessary to produce the
specified air content. The air-entrainment agent and the water reducer admixture shall be
compatible. Add air-entraining admixture in such a manner that will ensure uniform distribution of
the agent throughout the batch. The air content of freshly mixed air-entrained concrete shall be
based upon trial mixes with the materials to be used in the work adjusted to produce concrete of
the required plasticity and workability. The percentage of air entrainment in the mix shall be in
accordance with Table 3 plus or minus 1-1/2 percentage points. Air content shall be determined by
testing in accordance with ASTM C 231 for gravel and stone coarse aggregate.
TABLE 3. ENTRAINED AIR TOLERANCES
Coarse Aggregate Size Air Content Percent by Volume
1-1/2” 5% (±1%)
2. Chemical Admixtures: Water-reducing, set-retarding and set-accelerating admixtures meeting the
requirements of ASTM C 494. Water reducing and set-controlling admixtures shall be added to the
mix in the manner recommended by the manufacturer and in the amount necessary to comply with
the specification requirements. Tests shall be conducted on trial mixes, during the mix design, in
accordance with ASTM C 494.
G. Curing Materials:
1. Moisture-Retaining Cover: ASTM C 171, polyethylene film or white burlap-polyethylene sheet.
2. White polyethylene film for curing concrete conforming to ASTM C171.
3. Clear Solvent-Borne Liquid-Membrane-Forming Curing Compound: ASTM C 309, Type 1,
Class B.
4. Waterproof paper for curing concrete conforming to ASTM C171.
I. Premolded Joint Filler:
1. Expansion and Isolation-Joint-Filler Strips: ASTM D 1751, asphalt-saturated cellulosic fiber, or
ASTM D 1752, cork or self-expanding cork.
2. Contraction Joints: Resin-impregnated fiberboard conforming to the physical requirements of
ASTM D1752. The filler for each joint shall be furnished in a single piece for the full depth and
width required for the joint. When the use of more than one piece is authorized by the Engineer for
a joint, the abutting ends shall be fastened securely and held accurately to shape by stapling or
other positive fastening means.
J. Joint Sealer:
1. Refer to section 02764 “PAVEMENT JOINT SEALANTS”.
2.4 CONCRETE MIXES AND MIXING
A. Proportions: Proportioning requirements shall be for a flexural strength of 700 psi. Flexural strength shall
be specified at 28 days using test specimens prepared in accordance with ASTM C31 and tested in
accordance with ASTM C78. For slip-form construction, a high degree of uniformity in the plastic concrete
is required. Caution should be exercised in establishing the air-entrainment percentage, as excessive air
entrainment will aggravate edge slumping and insufficient air entrainment will result in poor concrete
CEMENT CONCRETE PAVEMENT 02751 - 3