超长保坍湿喷混凝土用聚羧酸系减水剂的应用性能评价
发布时间：2019-05-17 09:02
【摘要】：以坍落度损失率及扩展度损失率为主要考察指标,采用正交法制备出超长保坍湿喷混凝土用聚羧酸系减水剂,并对该减水剂进行了不同掺量、不同水泥品种、不同胶凝材料用量及不同环境温度下的长时间保坍性能的评价。结果表明,该减水剂随掺量的提高,坍落度及扩展度的保持性能得到显著的提升,与不同水泥具有相对广泛的高保坍适应性,但该减水剂需要一定用量的胶凝材料才能赋予湿喷混凝土长时间的高保坍性能;环境温度对该减水剂的长时间保坍性能存在一定的影响,但该减水剂依然可以在40℃的环境温度下实现超长时间(4~6 h)的保坍,满足长时间泵送施工的技术要求。
[Abstract]:Taking the slump loss rate and expansion loss rate as the main indexes, the polycarboxylic acid series water reducer for super long slump retaining wet shotcrete was prepared by orthogonal method, and different dosage and cement varieties of the water reducer were carried out. Evaluation of long time slump retention of different cementitious materials and different ambient temperatures. The results show that with the increase of the content of the water reducer, the slump and expansion of the water reducer are significantly improved, and it has a relatively wide adaptability to high slump preservation with different cement. However, the water reducer needs a certain amount of cementitious material in order to give wet shotcrete high slump preservation performance for a long time. The ambient temperature has a certain influence on the slump retention performance of the superplasticizer for a long time, but the superabsorbent can still maintain collapse for a long time (4 脳 6 h) at the ambient temperature of 40 鈩，
本文编号：2478975
[Abstract]:Taking the slump loss rate and expansion loss rate as the main indexes, the polycarboxylic acid series water reducer for super long slump retaining wet shotcrete was prepared by orthogonal method, and different dosage and cement varieties of the water reducer were carried out. Evaluation of long time slump retention of different cementitious materials and different ambient temperatures. The results show that with the increase of the content of the water reducer, the slump and expansion of the water reducer are significantly improved, and it has a relatively wide adaptability to high slump preservation with different cement. However, the water reducer needs a certain amount of cementitious material in order to give wet shotcrete high slump preservation performance for a long time. The ambient temperature has a certain influence on the slump retention performance of the superplasticizer for a long time, but the superabsorbent can still maintain collapse for a long time (4 脳 6 h) at the ambient temperature of 40 鈩，
本文编号：2478975
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