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本课题研究了聚羧酸减水剂与水泥的适应性;根据本地应用较广的典型材料,进行正交试验,找出较优的配合比;设计了系列使用聚羧酸减水剂配制的混凝土试验进行力学性能分析;引入萘系减水剂与其进行对比试验;为了改善聚羧酸减水剂配制混凝土的可泵性,利用自产超细粉煤灰进行可行性研究;同时,从配制成本角度,对聚羧酸减水剂在普通混凝土中应用的经济性进行了分析。研究结果表明:聚羧酸减水剂与水泥的适应性较萘系减水剂强,并且具有明显的高保塑性;减水剂是影响混凝土性能最重要的因素之一;确定自产机制砂与河砂的较佳搭配比例;聚羧酸减水剂所配制的混凝土施工性能、耐久性能都优于萘系减水剂;从配料成本看,除C15、C20使用聚羧酸减水剂在本未有明显降低外,其它标号的混凝土使用聚羧酸减水剂其综合成本下降较大,且随着标号提高,其成本优势越明显;超细粉煤灰在混凝土中使用,不仅能改善混凝土的性能,更能有效降低混凝土的配料成本。
This topic studies the adaptability of polycarboxylate water reducer and cement; according to the typical local materials with wide application, conduct orthogonal test to find out the better mix ratio; design a series of preparation using polycarboxylic acid water reducer The concrete test was used to analyze the mechanical properties; the naphthalene series water reducer was introduced and compared with it; in order to improve the pumpability of the polycarboxylate water reducing agent in the preparation of concrete, the self-produced ultrafine fly ash was used for feasibility study; at the same time, from the preparation From the perspective of cost, the economical application of polycarboxylate water reducer in ordinary concrete was analyzed. The results show that the adaptability of polycarboxylate superplasticizer and cement is stronger than that of naphthalene superplasticizer, and it has obvious high plasticity retention. Water reducer is one of the most important factors affecting the performance of concrete; The ratio of river sand is better; the construction performance and durability of concrete formulated with polycarboxylate water reducer are all superior to those of naphthalene water reducer; from the perspective of the cost of ingredients, except that C15, C20 use polycarboxylate water reducer in this Without significant reduction, the use of polycarboxylate water reducer for other grades of concrete reduces its overall cost, and as the labeling increases, its cost advantage becomes more obvious; ultra-fine fly ash is used in concrete to improve not only concrete but also concrete. The performance is more effective in reducing the ingredients cost of the concrete.