Effect of alkali-activated waste glass powder on mechanical performance and microstructure of cement mortar
The effects of the contents of waste glass powder(WGP)and alkaline activator(NaOH)on the compressive and flexural strengths of mortar were investigated and the microstructure was analyzed.The results show that,compared with the pure cement mortar specimens,when NaOH is not blended in the system,the incorporation of WGP reduces the compressive and flexural strengths of the mortar.The incorporation of appropriate content of NaOH can effectively improve the 120 d compressive and flexural strengths of the mortar with WGP.All mortar specimens contain calcite,AFt,calcium hydroxide(CH),C-S-H,of which,the mortar specimens with WGP also contain C-A-S-H.The number of cracks in the specimens of N0 group is relatively small and the size of the cracks is large,while the specimens of N1 and N3 group are characterized by multi-cracks,and the size of the cracks is relatively small.The C-(A)-S-H in the mortar specimens with low NaOH content is in the form of elongated fibers,and the C-(A)-S-H in the mortar specimens with high NaOH content is in the form of coral with multiple fine pores.The activity of WGP is stimulated when NaOH content is appropriate,and participates in the hydration reaction of the system.
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