Title: Extended Workability of Concrete Containing High-Range Water-Reducing Admixtures in Hot Weather
Author(s): James S. Hampton
Publication: Symposium Paper
Appears on pages(s): 409-422
Keywords: admixtures; field tests; high temperature; hot weather -- construction; lightweight aggregates; mix proportioning; placing;
plasticizers; portland cements; pumped concrete; slump tests;
water-reducing agents; workability.
Normally in hot weather, it is difficult to maintain the workability of concrete containing high-range water-reducing admixtures (H-R W-RA) as the concrete temperatures approach 85 - 90°F(29 to 32oC). The loss of fluidity and workability often occurs within 30 min. after the introduction of the adrnix-ture making placement and pumping very difficult if there are delays. This paper discusses how certain modified H-R W-RA may be used to provide fluidized concrete with prolonged work-ability.