三元复合水泥浆体水化进程及其与干缩的关系

Relationship between Hydration Degree and Drying Shrinkage of Ternary Composite Cement Paste

采用选择性溶解法和非蒸发水法分别测量了粉煤灰-硅灰和水泥的反应程度;通过复合浆体中有效水胶比的计算和非线性拟合的方法,得出复合浆体中水泥的反应程度,研究了粉煤灰-硅灰-水泥三元体系中矿物掺合料对水泥水化程度的影响。根据矿物掺合料和水泥的反应程度数据,并结合强度数据分析了复合水泥浆体干燥收缩的规律。研究发现:在相同龄期,随着硅灰的逐渐增多,粉煤灰的逐渐减少,复合浆体的干燥收缩逐渐增大;在不同龄期,复合浆体的干燥收缩值随着龄期的延长,干燥收缩曲线由陡逐渐变得平缓;当粉煤灰和硅灰总掺量为50%,而其中的硅灰为5%时,可以得到干燥收缩较小,抗压强度较高的三元复合水泥浆体。

Selective dissolution method and non-evaporable water method were used to measure the reaction degree of fly ash silica fume and cement respectively,combing the effective water-to-cement（ W/C） ratio and nonlinear fitting method to explore the reaction degree of cement of the composite cement paste. The aim of the study was to investigate the impacts of mineral admixtures which in fly ash silica fume cement ternary system on the reaction degree of cement. Combine the reaction degree of mineral admixtures and cement with the compressive strength to analysis the drying shrinkage characteristics of the composite cement paste. It is shown that for the same curing ages,drying shrinkage values of the composite cement paste gradually increase with silica fume increased,fly ash decreased.For the different curing ages,the curve of drying shrinkage of the composite cement paste is steep,then smooth gradually along with ages. The results also show that composite cementitious material containing5% silica fume can meet the composite cement paste which has small drying shrinkage value and high compressive strength when the total amount of fly ash and silica fume accounts for 50%.