Rev. 8-20-96
MICROSILICA CONCRETE BRIDGE DECK OVERLAY
733-B-104
The Standard Specifications are revised as follows:
SECTION 733, BEGIN LINE 1, INSERT AS FOLLOWS:
SECTION 733 -- MICROSILICA CONCRETE BRIDGE DECK OVERLAY
MATERIALS
CONSTRUCTION REQUIREMENTS
SECTION 912, AFTER LINE 58, DELETE AND INSERT AS FOLLOWS:
(c) (d)
Certification. Prior to furnishing admixtures, each
manufacturer shall
SECTION 912, AFTER LINE 160, INSERT AS FOLLOWS:
(a) A minimum of 390 kg (658 lb) of cement shall be used per cubic meter (cubic yard) of concrete.
(b) A minimum of 30 kg (50 lb) of microsilica shall be used per cubic meter (cubic yard) of concrete.
(c) The maximum water-cement ratio shall be 0.400.
(d) The coarse aggregate shall be size No. 11.
(e) Entrained air, by volume, shall be 6.5 " 1.5 percent at the time of placement. The admixture shall be a tall oil or a vinsol resin based air entraining agent.
(f) Sufficient high range water reducing admixture shall be used to transform a 25 to 50 mm (1 to 2 in.) slump mix to a 125 to 200 mm (5 to 8 in.) slump mix.
APPROVED MICROSILICA ADMIXTURES FOR CONCRETE
APPROVED MICROSILICA EVAPORATION RETARDANTS