| Four kinds of ceramic wastes (tableware ceramics, sanitary ceramics, exterior wall ceramics and floor tile ceramics) were ground by a ball milling to obtain two different fineness of each one. Surface areas, density, particle size distribution and particle size index were used to characterize physical property of ceramic waste powder while pH value, oxide compositions and crystal phases were conducted to analyze chemical property of the powder.The partial substitution of Portland cement blended with tableware ceramic waste powder at the ratio of5%,10%,15%,20%and25%weight percentage was analyzed. However, with the sanitary ceramic, exterior wall ceramic, floor tile ceramic waste powder at the ratio of10%,15%and20%. Water requirement of normal consistency, setting time and soundness of some blended cement pastes were tested and so was the compressive strenth. Flowability, flexural strength, compressive strength and shrinkage of blended cement mortars were also conducted in the study. The pozzolanic activity was examined according to the Frattini test method and strength activity index test method.Then the paste with10%and15%tableware ceramic waste powder were choosed to study later in the microstructure, comprehensive thermal analysis, and pore structure analysis compared with CEM.The test results showed that ceramic waste powder can be used as cement admixture in the construction. The Frattini test method and SAI test method supported with each other and verified that ceramic waste powder in the study showed good pozzolanic activity. Pozzolanic activity increased with the surface area of the powder. The ceramic waste powder promoted hydration degree and setting time. To some extent, the porosity and pore distribution homogeneity decreased with the LTC powder. With ceramic waste powder, flowability of mortars improved slightly. The best mix ratio of ceramic waste powder was between10%and15%. From the study, cement with10%tableware ceramic waste powder acted better than that with others. |
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