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首页> 外文期刊>International journal of green energy >Experimental study on the effect of fly ash content in cemented paste backfill on its anti-sulfate erosion
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Experimental study on the effect of fly ash content in cemented paste backfill on its anti-sulfate erosion

机译：粉煤灰含量在粘液浆料回水抗硫酸盐侵蚀中的实验研究

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摘要

In order to study the effect of fly ash content in cemented paste backfill (CPB) on its anti-sulfate erosion, the apparent phenomenon, strength development, and hydration products change the law of CPB with different fly ash content under long-term soaking of 5% sodium sulfate solution were studied by the macrotest and microanalysis, in addition, the mechanism of CPB anti-sulfate attack was analyzed by combining with a scanning electron microscope (SEM). The results indicated that the effect of sulfate environment on the strength of fly ash cemented paste backfill (FCPB) was mainly determined by the hydration products in the FCPB at different soaking times. In the early soaking stage, the formation of ettringite (AFt) in FCPB could improve its compactness, which was conducive to improving the strength of FCPB. In the late soaking stage, there were ettringite-type erosion damage and gypsum erosion-type damage internal of the FCPB with low content fly ash, resulting in microfracture, cracking of the FCPB, and reducing the strength. CPB with an appropriate content of fly ash could improve the internal structure of the FCPB to achieve the purpose of anti-sulfate erosion.
机译：为了研究粉煤灰含量在水泥浆料回填（CPB）对其抗硫酸盐侵蚀的影响，表观现象，强度发展和水合产物在长期浸泡下用不同的粉煤灰含量改变CPB定律通过MACROTEST和微分分析研究了5％硫酸钠溶液，另外，通过与扫描电子显微镜（SEM）组合来分析CPB抗硫酸盐发作的机理。结果表明，硫酸盐环境对粉煤灰粘贴浆料回填（FCPB）的强度的影响主要由不同浸泡时间的FCPB中的水合产物确定。在早期浸泡阶段，FCPB中Ettringite（AFT）的形成可以提高其紧凑性，这有利于提高FCPB的强度。在晚期浸泡阶段，耐菌型侵蚀损伤和石膏侵蚀型损伤，具有低含量粉煤灰，导致微折冲，FCPB的开裂，降低强度。 CPB具有适当的粉煤灰含量可以改善FCPB的内部结构，以达到抗硫酸盐腐蚀的目的。

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