Utilization of straw ash as a partial substitute for ordinary Portland cement in concrete

Liang Wen, Changhong Yan, Yehui Shi, Zhenxiang Wang, Gang Liu, Wei Shi
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Abstract

The disposal of agricultural waste ash is a great ecological challenge. This study analyzed the basic properties of corn straw ash and soybean straw ash, encompassing the identification of key oxides, the assessment of particle size distribution, and the performance of thermogravimetric analysis. This study also evaluated the potential of corn straw ash and soybean straw ash to replace cement in mortar and concrete through laboratory tests. The findings indicated that the strength activity index of corn straw ash was higher than soybean straw ash. Furthermore, when these ashes were used as cement replacements, the compressive strength of concrete decreased. Notably, concrete containing corn straw ash exhibited greater strength than concrete with the same substitution amount of soybean straw ash. Specifically, at a 5% substitution level, the compressive strengths of corn straw ash concrete and soybean straw ash concrete were 31.5 and 30.5 MPa, respectively. Additionally, soybean straw ash concrete demonstrated superior resistance to water penetration compared to corn straw ash concrete. Both corn straw ash and soybean straw ash exhibited the potential to enhance the early crack resistance of concrete.
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利用稻草灰部分替代混凝土中的普通硅酸盐水泥
农业废灰的处理是一项巨大的生态挑战。本研究分析了玉米秸秆灰和大豆秸秆灰的基本特性,包括关键氧化物的鉴定、粒度分布的评估以及热重分析的性能。这项研究还通过实验室测试评估了玉米秸秆灰和大豆秸秆灰在砂浆和混凝土中替代水泥的潜力。结果表明,玉米秸秆灰的强度活性指数高于大豆秸秆灰。此外,用这些灰烬替代水泥时,混凝土的抗压强度会降低。值得注意的是,含有玉米秸秆灰的混凝土比含有相同替代量大豆秸秆灰的混凝土强度更高。具体来说,在 5% 的替代水平下,玉米秸秆灰混凝土和大豆秸秆灰混凝土的抗压强度分别为 31.5 兆帕和 30.5 兆帕。此外,与玉米秸秆灰混凝土相比,大豆秸秆灰混凝土的抗渗水性能更优。玉米秸秆灰和大豆秸秆灰都具有增强混凝土早期抗裂性的潜力。
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