Effect of curing temperature on mechanical behaviour of green concrete containing glass powder as cement replacement

Abstract

The effects of curing temperature (23, 40 and 50°C) on the mechanical properties of cement paste and concrete containing glass powder (GP; 0, 10, 20 and 30%) as a cement replacement are investigated. In addition, a new mixing method (NMM) is studied, which involves soaking the GP before adding it to the concrete. The results show that an increase in the immersion time decreases the Na+/Ca2+ ratio for mixes with 10% GP. The amount of dicalcium silicate, tricalcium silicate and portlandite decreases with the increase in curing temperature, indicating the activation of the pozzolanic reaction. The results show a significant increase in the density and compressive strength early in the curing process due to the higher pozzolanic reaction of GP at elevated temperatures. At higher temperatures, the differences between the control and the GP mixes become smaller. The NMM enhances the mechanical behaviour of concrete compared with conventional mixing. An increase in the compressive strength of 30% is obtained at 10% GP.