2022 Volume 60 Issue 7 Pages 597-604
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.
