Effect of Pumice Aggregate and Air Entrainment on the Freeze-Thaw Durabilities of HSC

The objective of this work is to calculate the compressive strength and relative dynamicmodulus of elasticity (RDME) induced into concrete during freezing and thawing. Freeze thaw durability of concrete is of great importance to hydraulic structures in cold areas. In thispaper, freezing of pore solution in concrete exposed to a freeze-thaw cycle is studied byfollowing the change of concrete some mechanical and physical properties with freezing temperatures. The effects of pumice aggregate (PA) ratios on the high strength concrete(HSC) properties were studied at 28 days. PA replacements of fine aggregate (0-2 mm) wereused: 10%, 20%, and 30%. The properties examined included compressive strength and RDME properties of HSC. Results showed that compressive strength and RDME of samples were decreased with increase in PA ratios. Test results revealed that HSC was still durable after 100, 200 and 300 cycles of freezing and thawing in accordance with ASTM C666, Bprocedure. After 300 cycles, HSC showed a reduction in compressive strength between 6 to 21 percent, and reduction in RDME up to 16 percent