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构筑物大坡度成型面的坡度保持是混凝土施工质量控制的难点,尤其是在施工时间有限、抹面次数受限的工况下更难控制。针对混凝土所成坡度在硬化前无法有效保持与定型,导致排水或构造坡度不满足要求的现实难题,通过新拌混凝土形态保持能力、浆体形貌观察分析等室内试验以及现场工程试用,研究采用TKC触变剂来改善新拌混凝土的塑性形态保持能力。结果表明:TKC触变剂的加入改善了新拌混凝土的坡度保持能力,在泵送压力无明显增加、施工难度无明显增加情况下,其混凝土硬化后坡度保持良好。这主要与TKC触变剂中纤维状组分通过缠结、桥接、交织作用形成交联网络对浆体及其骨料的束缚、增糙、限位等效应有关。研究成果可为构筑物大坡度混凝土成型面形态保持的技术难题提供一定的借鉴与参考。
It is difficult to control the quality of concrete construction especially for the limited slope construction time. In view of the fact that the slope made by concrete can not be effectively retained and set before hardening, leading to the difficulty of drainage or structural slope does not meet the requirements, through the laboratory test of fresh concrete morphology retention and slurry morphology observation and analysis and field engineering, TKC thixotropic agent to improve the plasticity of fresh concrete retention ability. The results show that the addition of TKC thixotropic agent improves the slope retention ability of fresh concrete. The slope of the concrete remains well after no significant increase in pumping pressure and no significant increase in construction difficulty. This is mainly related to the effect of fibrinous components in TKC thixotropic agent, such as tethering, bridging and interweaving, to form a cross-linked network that binds the slurry and its aggregates, increases roughness and limits. The research results can provide some reference and reference for the technical problems of maintaining the shape of the large slope concrete structures.