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首页> 美国卫生研究院文献>Polymers >Developing a Polypropylene Fabric Silica Fume and Redispersible Emulsion Powder Cementitious Composite for Dynamic Water Environment
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Developing a Polypropylene Fabric Silica Fume and Redispersible Emulsion Powder Cementitious Composite for Dynamic Water Environment

机译：开发用于动态水环境的聚丙烯织物硅粉和可再分散乳胶粉水泥基复合材料

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In the dynamic water environment, grouting requires a material with higher strength and anti-washout performance to prevent groundwater inrush. This study aims to develop a dynamic water slurry by mixing polypropylene fiber (PP fiber), silica fume (SF) and the polymer material of redispersible emulsion powder (REP) to the Portland cement. Towards this aim, a series of tests, including strength, gel time, bleeding rate, fluidity, and anti-washout, were conducted to evaluate the effects of SF, PP fiber, and REP on the slurry properties. The test results show that: (1) SF displays significant effects on strength, gel time, fluidity, and bleeding rate of cement slurry. Differently, PP fiber mainly affects the stress–strain behavior of the slurry and can improve the ductility significantly. (2) By mixing SF and fiber simultaneously, the slurry strength can increase by about 30%, and its strain can extend by more than 70%. Meanwhile, the composite slurry possesses great anti-washout properties at a low flow velocity (v ≤ 0.4 m/s), and the grouting retention rate (GRR) can reach up to 98.7%. However, the GRR decreases to a maximum value of 31.3% when v = 0.6 m/s. (3) By mixing the REP into the fiber-SF composite slurry, the GRR can further increase, reaching more than 60% even when v = 0.6 m/s. As a result, the developed fiber-SF cementitious composite slurry, which when mixed with REP, presents a favorable performance in the dynamic water environment.
机译：在动态水环境中，灌浆需要具有更高强度和抗冲洗性能的材料，以防止地下水涌入。这项研究旨在通过将聚丙烯纤维（PP纤维），硅粉（SF）和可再分散乳胶粉（REP）的聚合物材料混合到波特兰水泥中来开发动态水浆。为了达到这个目的，进行了一系列测试，包括强度，胶凝时间，渗出率，流动性和抗冲洗性，以评估SF，PP纤维和REP对浆料性能的影响。试验结果表明：（1）SF对水泥浆的强度，胶凝时间，流动性和渗出率有显着影响。不同的是，PP纤维主要影响浆液的应力-应变行为，并且可以显着提高延展性。 （2）通过同时混合SF和纤维，浆液强度可以增加约30％，并且其应变可以延伸超过70％。同时，该复合浆料在低流速（v≤0.4 m / s）下具有较强的抗冲刷性能，灌浆固持率（GRR）可达98.7％。但是，当v = 0.6 m / s时，GRR下降到最大值31.3％。 （3）通过将REP混入纤维-SF复合浆料中，即使v = 0.6 m / s，GRR仍可进一步提高，达到60％以上。结果，所开发的纤维-SF水泥基复合浆料与REP混合后，在动态水环境中表现出良好的性能。

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