Development of New Special Admixed Agent for Improved Workability and Quality of Hot Weather Concrete
By K. Sakurai, Y. Isaji, K. Saito and T. Oishi
Concrete Journal, Vol.60, No.7, Jul. 2022
- Synopsis
- To improve the workability and quality of concrete work during hot weather, the authors developed a new type of hot weather concrete using a special admixed agent with ingredients that maintain fluidity and delay setting time, and subjected it to various studies. As a result, we found among other things that (1) it is appropriate to use an admixed agent containing fluidity-retaining and setting-delaying ingredients to both maintain fluidity and secure allowable time between placements of fresh concrete, (2) the use of a special admixed agent can improve workability by ensuring the same level of fluidity retention time and allowable time between placements as concrete made at standard temperatures of about 20℃, even in environments exceeding 35℃, (3) the use of special admixed agent does not affect the quality of hardened concrete.
- Keywords:
- Hot weather concrete, Special admixed agent, Fluidity, Allowable time between placements of fresh concrete, Compressive strength, Durability, Workability
