【摘要】 为考察粉煤灰对水泥水化进程的影响,系统研究了水泥粉煤灰浆体在不同养护龄期、水胶比、粉煤灰掺量下水泥和粉煤灰反应程度、非蒸发水数量、水化产物数量、孔结构和浆体力学性能.根据实验结果,建立了水泥粉煤灰浆体中水泥反应程度与有效水灰比间的定量关系,推导出水泥和粉煤灰反应程度与胶空比之间的计算公式,并通过研究胶空比与浆体抗压强度关系曲线和比较胶空比与实测孔隙率来验证该公式的正确性;另外,还对水泥粉煤灰浆体的非蒸发水量与水化产物数量间的关系进行了研究,结果表明二者呈线性相关,可用非蒸发水量反映水化产物数量.更多还原

【Abstract】 To explore the hydration process of Portland cement-fly ash system, the reaction degree of fly ash and Portland cement,non-evaporable water content,amount of hydration products,porosity and compressive strength of pure cement pastes and cement-fly ash pastes were studied at various curing ages,water-to-binder ratio(W/B),and fly ash replacement percentages.Based on the experimental results,the relationship between the degree of cement hydration and the effective water-to-cement(W/C) ratio,which is given by W/(C+α_FF),is established.An equation describing the dependence of gel/space ratio on the degree of cement hydration and fly ash reaction is also proposed.The calculated gel/space ratios for cement-fly ash pastes are consistent with those for pure cement pastes in terms of their relationship with compressive strength.The proposed equation is verified by comparing the calculated gel/space ratios with the measured porosity by mercury intrusion porosimetry.Thus the proposed equation has been justified.In addition,the relationship between non-evaporable water content and amount of hydration products calculated by the degree of cement hydration and fly ash reaction is explored.The linear correlativity shows that the amount of hydration products can be figured out by using non-evaporable water content.更多还原