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发明公开
CN109956701A 一种无砟轨道自密实混凝土工作性保持剂及其制备方法 无效 - 撤回

一种无砟轨道自密实混凝土工作性保持剂及其制备方法
摘要：
本发明属于混凝土外加剂技术领域，具体涉及一种无砟轨道自密实混凝土工作性保持剂及其制备方法。该工作性保持剂由聚羧酸系超塑化剂、HLB值调节剂、分散保持助剂、缓凝剂、消泡剂和去离子水经搅拌混合而成，其中各组分间的质量比为羧酸系超塑化剂（17~28份）：HLB值调节剂（0.02~0.5份）：分散保持助剂（0.01~0.05份）：缓凝剂（0.5~2.5份）：消泡剂（0.02~0.5份）：去离子水（68.9~82.45份）。该工作性保持剂的制备方法为常温常压聚合反应。本发明提出的一种无砟轨道自密实混凝土工作性保持剂可实现在35℃高温环境下保持混凝土3h无坍落度损失，且不影响混凝土的终凝时间；此外，本发明的制备方法简单，制备过程无污染，原料成本低，对混凝土原材料适应性广。
摘要（英）：

The invention belongs to the technical field of concrete admixtures, and particularly relates to a workability keeping agent for ballastless track self-compacting concrete and a preparation method ofthe workability keeping agent. The workability keeping agent is formed by performing mixing under stirring on the following materials, in parts by mass: 17-28 parts of a polycarboxylic acid super plasticizer, 0.02-0.5 part of an HLB value regulating agent, 0.01-0.05 part of a dispersion keeping auxiliary agent, 0.5-2.5 parts of a retarder, 0.02-0.5 part of an antifoaming agent and 68.9-82.45 partsof deionized water; and the preparation method of the workability keeping agent is a normal-temperature normal-pressure polymerization reaction. The workability keeping agent for the ballastless track self-compacting concrete provided by the invention can realize the purpose that the concrete has no slump loss within 3 h in a high-temperature environment of 35 DEG C and does not affect the finalsetting time of the concrete; and in addition, the preparation method is simple, has a pollution-free preparation process, low raw material costs, and wide adaptability to concrete raw materials.

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