Influence of fly ash content on chloride diffusion coefficient and carbonation rate of concrete

Based on the chloride immersion test and rapid carbonation test,the laws of chloride diffusion coefficient and carbonation rate influenced by fly ash content were studied.By combining the experimental data and comparative analysis of existing models,more reasonable expressions of fly ash influence coefficient as well as the corresponding suggested values were proposed.Based on the chloride diffusion coefficient of ordinary concrete,the influence coefficient of fly ash content is kF=D/DF0= 4.03(mF/mF+C)2-2.48(mF/mF+C)+1.02.Based on the carbonation rate of ordinary concrete,the influence coefficient of fly ash content is kFc=1.07exp(2.16mF/mF+C).