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探讨聚羧酸减水剂与脂肪族减水剂复配的可行性,并将该复配减水剂分别用于秦岭、海螺和锦荣3个不同厂家的水泥制成混凝土,通过对水泥净浆流动度以及混凝土的初凝时间、终凝时间、坍落度、扩展度与抗压强度等性能的测定,研究该复配减水剂对不同水泥的适应性。结果表明,聚羧酸减水剂与脂肪族减水剂溶液可以互溶,随着脂肪族减水剂的增加,3种水泥的净浆流动度均呈下降趋势,但掺入量至60%时,仍有较好的流动度。单独使用聚羧酸减水剂时,锦荣水泥拌合物的凝结时间最短,坍落度最大;海螺水泥的凝结时间最长,坍落度最小。此外,复配减水剂对3种水泥的凝结时间影响不大,但坍落度及其保持性显著降低。抗压强度结果显示,锦荣水泥制成的混凝土抗压强度较好,并且使用复配减水剂时,秦岭和海螺水泥制成的混凝土抗压强度变化不大。
The feasibility of compounding polycarboxylate superplasticizer with aliphatic superplasticizer was discussed. The compound superplasticizer was used to make concrete from three different manufacturers in Qinling, Conch and Jinrong. The fluidity of the slurry and the initial setting time, the final setting time, the slump, the expansion and the compressive strength of the concrete were measured to study the adaptability of the water reducer to different cements. The results show that polycarboxylate superplasticizer and aliphatic superplasticizer solution can be miscible with each other, with the increase of aliphatic superplasticizer, the fluidity of the three kinds of cement paste shows a downward trend. However, when the content of the superplasticizer is 60% , There is still a good degree of mobility. When polycarboxylate superplasticizer is used alone, Jinrong cement mixture has the shortest setting time and the largest slump. Conch cement has the highest setting time and the lowest slump. In addition, the compound superplasticizer has little effect on the setting time of the three kinds of cement, but the slump and its retention are significantly reduced. The results of compressive strength show that the compressive strength of concrete made by Jinrong Cement is better, and the compressive strength of concrete made by Qinling and Conch Cement has little change when complex superplasticizer is used.