针对多年冻土地区工程施工时混凝土养护的问题,采用10%、20%、30%的矿粉和粉煤灰替代量等量替代水泥,测试了-3 ℃恒温养护条件下0.38水胶比水泥浆体在各个龄期的水泥水化热,计算了水泥水化程度;分析了龄期及矿物掺合料对水泥水化程度的影响规律,建立了综合考虑龄期和矿物掺合料替代量的水泥水化程度计算模型.结果表明:-3 ℃恒温养护下,矿物掺合料等量替代水泥,水泥浆体的水化程度会降低,粉煤灰降低水化程度的值要比矿粉高;在相同矿物掺合料替代量下,随着龄期的增长,矿物掺合料对水泥水化程度的影响逐渐减弱;同一龄期时,随着矿物掺合料的增加,矿物掺合料对水泥水化程度的影响逐渐增强;利用建立的模型计算了分别掺入15%矿粉和粉煤灰的水泥水化程度,与实测值相比,计算值偏离值较少,预测精度较高.
Aiming at the problems of concrete maintenance in the engineering construction in permafrost regions, by 10%, 20% and 30% of the ground granulated blast furnace slag(GGBS) and fly ash(FA) replacing cement content, the hydration heat of cement pastes with 0.38 water cement pastes at different ages was tested under the condition of constant temperature curing at-3 ℃, and the hydration degree of cement was calculated.The influence of age and mineral admixtures on the hydration degree of cement was analyzed, and the calculation model of the hydration degree of cement was established.The results show that the-3 ℃ constant temperature curing, mineral admixture replacing cement, the hydration degree of cement paste can be reduced, FA to reduce the degree of hydration value than GGBS.With the increase of the age, the effect of mineral admixtures on the hydration degree of cement is gradually decreased with the increase of the age of the same mineral admixture.At the same time, with the increase of mineral admixture, the effect of mineral admixtures on the hydration degree of cement is gradually increasing.The cement hydration degree were mixed with 15% FA and GGBS were calculated by using the model, compared with the measured values, the deviation is less, higher prediction accuracy.
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