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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.
The effects of SBR on the early hydration rate, hydration exotherm and degree of hydration of synthetic single mineral-gypsum composite system (C3S-C2S-C3A-C4AF-CaSO4 · 2H2O) were analyzed by isothermal calorimetry The results showed that the addition of SBR decreased the first exothermic peak value (v1max) of the hydration exothermic rate curve of the composite system, while when the SBR content (mass ratio) was more than or equal to 10% But the content of SBR did not change much. The SBR did not affect the initial hydration period of the composite system significantly. Butadiene-styrene latex had a significant retardation effect on the hydration induction phase, acceleration phase and deceleration phase of the composite system. However, When the content of benzene emulsion is more than 15%, the retardation no longer increases with the increase of SBR content. The addition of SBR decreases the second exothermic peak ( v2max). After the incorporation of SBR, the hydration of the composite system decreased and the degree of hydration decreased.