玉米秸秆灰替代水泥对刚性路面混凝土强度的影响

Roza Mildawati, A. Puri, M. Handayani
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引用次数: 0

摘要

水泥是混凝土混合物除水、细、粗骨料外的粘结材料。水泥的主要成分之一是二氧化硅(SiO2),它来源于地壳。二氧化硅也存在于玉米秸秆等植物中。本研究的目的是利用玉米秸秆灰分(CSA)作为混凝土中部分水泥的替代品,用于道路施工的刚性路面。根据印尼标准,弯曲抗拉强度应至少超过4.5 MPa。由于抗压强度,弯曲抗拉强度也具有相关性。混凝土材料由来自廖内省贡巴地区的粗骨料(河流碎石)和来自廖内省贡巴地区的Danau Bingkuang砂,以及来自Semen Padang的波特兰复合水泥组成。CSA是通过将干燥的玉米秸秆在钢瓶中燃烧24小时制成的。CSA含量变化幅度分别为0%、5%、7%和9%。混凝土设计抗压强度为31.3 MPa。测试程序以印度尼西亚混凝土标准为基础。测试样本包括用于压缩测试的立方体样本(150毫米x 150毫米x 150毫米)和用于弯曲强度测试的梁样本(150毫米x 150毫米x 600毫米)。所有标本均于28日龄进行检测。结果表明,CSA可以部分替代混凝土中的水泥。CSA的加入倾向于提高混凝土的抗压强度而不是抗弯抗拉强度。CSA的最佳掺量为7%,经设计可使材料抗压强度和抗折强度分别提高8.0%和6.9%。抗压、抗折强度符合标准。弯曲抗拉强度为抗压强度的15%。玉米秸秆灰可作为硬质路面混凝土的水泥替代品。它可以降低水泥的利用率,具有潜在的成本效益。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effects of Corn Stalks Ash as A Substitution Material of Cement Due to the Concrete Strength of Rigid Pavement
Cement is an adhesive material for concrete mixtures in addition to water, fine and coarse aggregates. One of the main ingredients of cement is silica (SiO2) which is originated from the earth's crust. Silica is also available in plants such as corn stalks. This research is aimed to utilize the corn stalk ash (CSA) as an alternative substitution for some cement in concrete for the rigid pavement of road construction. According to the Indonesian standard, the flexural tensile strength should be exceeded at least 4.5 MPa. The flexural tensile strength has also a correlation due to compressive strength. The concrete materials consisted of the coarse aggregate (river crushed stone) from Kampar River and Danau Bingkuang sands from Kampar District of Riau Province, and Portland Composite Cement from Semen Padang. The CSA was made by burning the dried corn stalks in a steel cylinder can over 24 hours. The content of CSA was varied by  0%, 5%, 7% and 9%. The compressive strength design of concrete was 31,3 MPa. Testing procedures were based on the Indonesian Standard for concrete. The tested specimens have consisted of cube specimens (150 mm x 150 mm x 150 mm) for compressive tests, and beam specimens (150 mm x 150 mm x 600 mm) for flexural strength tests. All specimens were tested on 28 days-age. The results show that CSA can be used as a partial substitution of cement in concrete. The addition of CSA tends to increase the compressive strength of concrete instead of its flexural tensile strength. The optimum content of CSA was 7% and resulted in an 8.0% and 6.9% increase in compressive and flexural tensile strength due to design respectively. Compressive and flexural tensile strength fulfilled the standard. Flexural tensile strength is obtained by 15% of the compressive strength. Cornstalk ash can be used as a substitution of cement for rigid pavement concrete. It can reduce the utilization of cement and will be potentially cost efficiency.
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