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Effect of Glass Powder on Strength and Microstructure of Ultra High Performance Cement-Based Materials

The effect of glass powder on strength and microstructure of ultra high performance cement-based materials was investigated in this paper, which aimed to provide an additional option for glass recycling and potentially reduce the high costs of this kind of materials. Compressive strength of pastes and mortars with different glass powder content were tested and their microstructure properties were analyzed by scanning electron microscopy (SEM). Test result showed that the compressive strength rose initially with the increase of the amount of glass powder, and reached to the peak at 20% replacement ratio, then decreased a little. The glass powder in ultra high performance cement-based materials had exhibited pozzolanic reaction and filling effect, contributing substantially to strength increase. In addition, no ASR micro-cracking ring was found around the large glass powder particle due to the enough fineness of glass powder and the existing of silica fume.