Abstract：Research purposes ： Taking natural pozzolanic concrete as the study object, this paper carries out a comparative analysis on the carbonation resistance of basic concrete (no mineral admixture) , pozzolanic concrete and fly ash concrete through accelerated carbonation test and differential thermal analysis. It also studies the improvement effect of adding few silica fumes on the carbonation resistance of pozzolanic concrete. The experimental study can provide technical guidance for actual engineering.
Research conclusions: (1) Under the dual effect of reduction of cement clinker and consumption of secondary hydration, the contents of Ca ( OH) 2 in pozzolanic concrete and fly ash concrete both decrease, so the carbonation resistance remarkably declines compared with that of basic concrete. (2) Under the same amount of admixture, comparing the fly ash concrete with the pozzolanic concrete, the carbonation resistance of the former is better than the latter. (3 ) The carbonation resistance of pozzolanic concrete mixed with silica fume increases significantly. The pozzolanic concrete mixed with 5% of silica fume, is even better than the fly ash concrete. Therefore, in terms of carbonation resistance, the fly ash concrete can be replaced by pozzolanic concrete mixed with 5% of silica fume.(4) The macroscopic experimental results are validated and analyzed by differential thermal analysis experiment.(5) For concrete engineering with rich natural volcanic ash resources, the research resutlts can stimulate the effective utilization of local resources, and bring the environmental benefits and economic benefits for actual engineering.
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2015, Vol. 32 
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