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沙漠砂混凝土耐久性试验分析-experimental analysis on durability of desert sand concrete
摘要沙漠砂资源在我国是很丰富的,也是未来建筑上很有潜力的材料。混凝土材料已成为目前建 筑上最主要的材料,混凝土主要是由水泥,粗骨料、细骨料、水等组成。细骨料主要来源是河砂, 细度模数在 1.5 以上,对细度模数在 1.5 以下的特细砂在混凝土方面的应用研究甚少,通过试验 把特细砂掺入混凝土中,能使混凝土强度和耐久性方面都接近普通混凝土,应用在工程建设中, 这样可以充分的利用沙漠砂资源,并且经济适用、资源丰富、能产生比较好的社会经济效益。本文以沙漠砂取代普通混凝土中的部分中砂为基础,进行了相应的抗冻性、抗水渗透性、碳 化性等耐久性试验的研究,通过试验数据分析,结合目前普混凝土耐久性方面的研究,本文得出 一些研究结果。本文试验研究的主要结论如下:1. 对沙漠砂混凝土抗冻性的研究,在试验的基础上分析出了最优的配合比及最优的沙漠砂 取代率,砂率取为 33%,水灰比为 0.4,沙漠砂的取代为 25%,减水剂掺量为 1.0%时,沙漠砂混 凝土的抗冻性最好。在粉煤灰的掺量下,粉煤灰掺量为 15%时的混凝土抗冻性要好于不掺粉煤灰 的混凝土的抗冻性,但随粉煤灰掺量继续的增加,混凝土的抗冻性变差。腾格里沙漠砂混凝土的 抗冻性略好于毛乌素沙地砂混凝土的抗冻性。2.对沙漠砂混凝土抗水渗透性的研究,通过单因素的试验,在抗冻性试验的基础上,选出 最佳的砂率,水灰比,只变化沙漠砂的取代率,试验结果表明沙漠砂的取代率为 15%时抗水渗透 性比较好。在粉煤灰的掺量下,粉煤灰掺量为 15%时沙漠砂的混凝土抗水渗透好于不掺粉煤灰混 凝土的抗水渗透性。对比两个沙漠砂混凝土的抗水渗透性,毛乌素沙漠砂混凝土好于腾格里沙漠 砂混凝土。3.对沙漠砂混凝土碳化性的研究,在沙漠砂取代率为 15%-25%时,碳化性能较好,沙漠砂 混凝土碳化性在随着沙漠砂取代率的增加,碳化性能力下降,在粉煤灰的掺量下,沙漠砂混凝土 碳化性能力随着粉煤灰掺量增加碳化性能力下降。关键词:沙漠砂混凝土、抗冻性、抗碳化、粉煤灰AbstractDesert sand resources in China is very rich, but also building on the promising future materials. Concrete has become the most important building materials, concrete is mainly made of cement, coarse aggregate, fine aggregate, water and other components. Main sources of river sand fine aggregate, fineness modulus of 1.5 or more, on the fineness modulus of 1.5 below the fine sand in the little concrete application of aspect, by testing the extra fine sand mixed with concrete, can Strength and durability of concrete are close to ordinary concrete, used in construction, so you can fully utilize resources in the desert sand, and affordable, abundant resources, can produce a better social and economic benefits.In this paper, replace the desert sand as part of ordinary concrete sand as the basis of the corresponding frost resistance, resistance to water penetration, carbonation resistance and other durability test research, analysis of the experimental data, combined with the durability of general concrete aspects of the present Research, we draw some of the findings.The main conclusions of this paper study are as followsFrost resistance of co
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