新型聚羧酸系保塑剂的性能研究.pdfVIP

学兔兔 全国中文核心期刊 钎 建巍 新型聚菝酸系保塑剂的性能研究 龚英，段国荣，黄国泓 (南京水利科学研究院 瑞迪高新技术公司，江苏 南京 210024) 摘要：针对混凝土坍落度损失较快问题，研制T一种梯形结构聚羧酸系保塑剂，对该保塑剂的性能研究结果表明，在低掺量时 具有高坍落度保持能力，其混凝土工作性好，与水泥适应性良好，与减水剂复配后效果明显优于单掺。掺入保塑剂后，可明显减缓水 泥早期水化放热速率，有利于提高混凝土的抗裂性。 关键词：聚羧酸：保塑性；适应性；水化热；复配 中图分类号：TU528．042 文献标识码：A 文章编号：1001—702X(2010)l1-0008—03 Study Oil performance of neotype polycarboxylate—plastic retaining admixture GONG Ying，DUAN Guorong，HUANG Guohong (Nanjing RuiDi High Technology Company，Nanjing Hydraulic Research Institute，Nanjing 210024，Jiangsu，China) Abstract：A trapezoidal frame polycarboxylate—plastic retaining admixture was synthesized to solve the problem of quick slump loss in concrete．Performance of the plastic retaining admixture was particularly studied．Results show that even using small dosage of the plastic retaining admixture could have excellent slump retaining capacity and make good workability of concrete：it has g00d compatibility with cements；effect of product mixed with superplasticizer is obviously better than that of single using．Using the plastic retaining admixture could obviously reduce and delay early hydrated heat release rate，which is benefit for improving the crack resistance of concrete． Key words：polycarboxylate：plastic retaining；compatibility；hydrated heat：compounding 当前，随着我国经济的发展和大型工程的建设，大体积、 之后，出现了新的聚羧酸系减水剂 。聚羧酸系减水剂根据 高泵程的混凝土施工工程越来越多地出现。混凝土的商品化 减水剂对水泥的作用机理，通过分子设计方法合成的具有梳 对掺高效减水剂混凝土的流动性保持性提出了更高的要求川。 型结构的分子链，从分子结构上解决了传统减水剂普遍存在 混凝土坍损较快，成为亟待解决的工程问题。混凝土坍损速度 的坍落度经时损失大、减水率相对较低以及会对环境产生危