Admixtures. The superplasticizer admixture must be a high-range water reducer (HRWR) capable of increasing the slump of the mix from approximately 2½ inches to 6½ inches upon the addition of the amount recommended by the respective manufacturer. The HRWR must conform to ASTM C494 Type F or Type G and shall be approved by the ConnDOT engineer when ConnDOT is the Client Agency. The use of this material must be in strict accordance with the respective manufacturer's written instructions and procedures.
Admixtures. Add the following Clause PSG 3.5.3:
Admixtures. Usually the water proof concrete specifications are written aiming to achieve a watertight concrete structures. But practically the concrete can sometime be very difficult to place. If agreed by the Engineer, the contractor will be permitted to use concrete with more plastic consistency helping to produce a smoother and denser floor and wall finishes requirements. In heavy reinforced structures, a good and long workability is also important. It is impossible to meet the water/cement ration > 0.5 and a good workability requirements at the same time unless concrete admixtures are used. Contractor may use admixtures and shall use if required by the Engineer admixtures such as: − Retarder − Accelerator − Plasticizer or super plasticizer − air entraining agent − water proofing admixtures − Fluid admixtures − Anti freeze admixtures Plasticizer and super plasticizer gives good workability and correct consistency (even for pumped concrete with extended working times) to enable the concrete to be compacted as fully as possible in as short a time as possible with a high reduction in the water/cement ratio.
Admixtures a. Include limitations of use, including restrictions on cementitious materials, supplementary cementitious materials, air entrainment, aggregates, temperature at time of concrete placement, relative humidity at time of concrete placement, curing conditions, and use of other admixtures.
Admixtures. (a) Air-entraining admixtures shall conform to the requirements of ASTM C260.
(b) Chemical admixtures shall conform to the requirements of ASTM C494 or C1017 for flowing concrete.
(c) All admixtures shall be compatible with all other constituents. The addition of calcium chloride, accelerators and air-reducing agents, will not be permitted, unless otherwise approved by the Contract Administrator.
Admixtures. 11.1 Air entraining admixtures shall conform to the requirements of ASTM C260.
Admixtures. A. Air Entrainment Admixture: ASTM C260.
B. Chemical Admixtures, as required: ASTM C494: 1. Type A - Water Reducing.
Admixtures. A. No admixtures will be permitted without prior notification and approval of the Design Professional and/or Inspector.
B. Air-Entraining Admixture: ASTM C 260.
C. Chemical Admixtures: Provide admixtures certified by manufacturer to be compatible with other admixtures and that will not contribute water-soluble chloride ions exceeding those permitted in hardened concrete. Do not use calcium chloride or admixtures containing calcium chloride.
1. Water-Reducing Admixture: ASTM C 494/C 494M, Type A
2. Retarding Admixture: ASTM C 494/C 494M, Type B.
3. Water-Reducing and Retarding Admixture: ASTM C 494/C 494M, Type D.
4. High-Range, Water-Reducing Admixture: ASTM C 494/C 494M, Type F.
5. High-Range, Water-Reducing and Retarding Admixture: ASTM C 494 494M, Type G.
6. Plasticizing and Retarding Admixture: ASTM C 1017/C 1017M, Type II.
Admixtures. A. No admixtures will be permitted without prior notification and approval of the Design Professional and/or Inspector.
B. Air-Entraining Admixture: ASTM C 260.
C. Chemical Admixtures: Provide admixtures certified by manufacturer to be compatible with other admixtures and that will not contribute water-soluble chloride ions exceeding those permitted in hardened concrete. Do not use calcium chloride or admixtures containing calcium chloride.
1. Water-Reducing Admixture: ASTM C 494/C 494M, Type A
2. Retarding Admixture: ASTM C 494/C 494M, Type B.
3. Water-Reducing and Retarding Admixture: ASTM C 494/C 494M, Type D.
4. High-Range, Water-Reducing Admixture: ASTM C 494/C 494M, Type F.
5. High-Range, Water-Reducing and Retarding Admixture: ASTM C 494 494M, Type G.
6. Plasticizing and Retarding Admixture: ASTM C 1017/C 1017M, Type II.
7. Moisture Vapor Reduction Admixture (MVRA). ISE Logik Industriees MVRA 900, or equal.
Admixtures. A. Use water-reducing admixture or high-range water – reducing admixture (Super- plasticizer) in concrete as required for placement and workability.
