Improving hydraulic properties of lime–rice husk ash (RHA) binders with metakaolin (MK)
作者： Ndigui Billong , U.C. Melo , E. Kamseu , J.M. Kinuthia , D. Njopwouo
DOI: 10.1016/J.CONBUILDMAT.2010.11.013
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摘要: Abstract To improve long-term hydraulic properties of binders from RHA and lime, 25–75% MK was added to RHA. Binders were formulated compared that containing or as only pozzolans. The lime–pozzolan ratio 1:3. tested after 7, 28 56 days were: absolute density fineness the binders, initial setting time, chemical mineralogical composition hydrated flexural compressive strengths water absorption mortars. micrographs hardened binder pastes at permitted evaluate densification different matrixes development pores. From results obtained, it concluded that, increased mixtures decreased their grindability. presence SiO2 content increases Al2O3 Fe2O3 contents. Calcium-silicate hydrates (CSH) gel gehlenite (C2ASH8) main phases formed during pozzolanic reaction in MK. No reduction observed 28 days for mixture 25% 75% which is recommended gave higher than with pozzolan. Water mortars less 20%.
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