丁苯乳液对合成单矿物石膏复合体系水化热的影响

Effect of Styrene Butadiene Rubber(SBR) Latex on Hydration Heat of the Composite System Composed by Synthesized Clinker Minerals and Gypsum

摘要:

利用等温量热法就丁苯乳液对合成单矿物石膏复合体系(C3SC2SC3AC4AFCaSO4·2H2O)早期水化放热速率、水化放热量以及水化程度的影响进行了分析.结果表明：丁苯乳液的掺加会降低复合体系水化放热速率曲线的第1放热峰值（v1max），而当丁苯乳液掺量(质量比)≥10%后，v1max随丁苯乳液掺量的增加变化不大；丁苯乳液对复合体系水化初始期经历时间基本没有影响；丁苯乳液对复合体系水化诱导期、加速期以及减速期有显著的延缓作用，但当丁苯乳液掺量≥15%时，这种延缓作用不再随着丁苯乳液掺量的增加而增强；丁苯乳液的掺加降低了复合体系水化放热速率曲线的第2放热峰值（v2max）；掺入丁苯乳液后，复合体系早期水化放热量减少，水化程度降低.

Abstract:

The effects of SBR latex on the hydration heat released rate, hydration heat released and hydration degree of the composite system composed by synthesized clinker minerals and gypsum(C3S C2S C3A C4AF CaSO4·2H2O) were analyzed by using isothermal calorimetry. The results show that, SBR latex reduces the first exothermic peak value(v1max) in the hydration heat released rate curve of the composite system, whereas when the use level(by mass) of SBR latex is higher than or equal to 10%, v1max does not change a lot any more with the increase of the SBR latex addition; SBR latex has no obvious influence on the elapsed time of the hydration initial period of the composite system; the hydration induction period, hydration acceleration period and hydration deceleration period of the composite system are delayed significantly by the SBR latex addition, but when the use level of SBR latex reaches higher than or equal to 15%, the delay effect does not enhance anymore with the increase of the SBR latex addition; SBR latex reduces the second exothermic peak value(v2max) in the hydration heat released rate curve of the composite system; the hydration heat released and hydration degree in early stage decrease with the increase of the SBR latex addition.