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研究龄期为7,28,60,140,210 d,粉煤灰取代水泥、取代细骨料和混合取代三种取代方式下混凝土抗压强度的发展状况,建立预测混凝土抗压强度增长因子双参数模型。结果表明:龄期与取代率对强度增长因子的影响是相互独立的;强度增长因子随龄期的增长而增大;取代水泥时,强度增长因子随取代率的增大而减小;取代细骨料时,强度增长因子随取代率的增大先增大后减小,最大值点在20%左右;取代细骨料对强度的增长较取代水泥有利;继而建立了混合取代方式下强度增长因子预测模型,引入取代率权重变化因子,其只与龄期有关,混合取代得到的强度增长因子介于取代水泥和取代细骨料得到的二者之间,且随龄期的增长,粉煤灰取代细骨料对强度的作用效应愈发增强。
The study period is 7,28,60,140,210 d, the fly ash instead of cement, instead of the fine aggregate and mixed substitution of the three kinds of substitution of concrete compressive strength of the development of conditions to establish a predictive concrete compressive strength growth factor two-parameter model. The results show that the effect of age and substitution rate on the strength growth factors are independent of each other. The strength growth factor increases with age. When cement is replaced, the strength growth factor decreases with the increase of substitution rate. Aggregate, the strength growth factor first increases and then decreases with the increase of substitution rate, and the maximum value is about 20%; instead of fine aggregate, the substitution of fine aggregate is more advantageous than the substitution of cement; then the strength of mixed reinforcement is increased Factor prediction model, the introduction of weight change factor of the substitution rate, which is only related to the age, the strength of the mixed substitution was obtained between the replacement of cement and replace the fine aggregate obtained between the two, and with age, The effect of the substitution of fine aggregate for strength on strength is even stronger.