为实现绿色环保宗旨,推动工业废渣利用,通过高炉矿渣、粉煤灰和电石渣等工业废渣协同水泥固化淤泥的一维固结和扫描电镜试验,研究了工业废渣种类、掺量和养护龄期对压缩特性的影响,探讨了微观作用机制。结果表明:工业废渣协同水泥固化淤泥对压缩性能提升作用明显。随工业废渣掺量增加,固化土孔隙比和压缩量逐渐减小,屈服应力逐渐增大;电石渣协同水泥固化土压缩性能逐渐增大,粉煤灰和高炉矿渣协同水泥固化土表现出先增加后减小的规律,最佳掺量与工业废渣种类有关;扫描电镜试验表明胶结和填充作用是改善压缩性能的主要原因;最后,基于有界函数建立了固化淤泥的压缩量预测模型,拟合效果优异,可为后续施工和研究提供参考。
Abstract
In the aim of environmental protection and promoting the utilization of industrial by-products, we conducted one-dimensional consolidation and scanning electron microscope (SEM) tests on cement solidified soil mixed with industrial by-products such as ground granulated blast-furnace slag, fly ash, and calcium carbide slag. We examined the microscopic mechanism of industrial by-products' type, content, and curing age affecting the compressibility behavior of cement solidified soil. Results demonstrated a significantly positive effect of industrial by-products on the compressibility behavior of cement solidified soil. As the content of industrial by-products increased, the void ratio and compression amount of solidified soil gradually decreased, while the yield stress increased. Moreover, the compressibility of soil solidified by cement with calcium carbide slag increased with higher content, whereas the compressibility of soil solidified by cement with fly ash and ground granulated blast-furnace slag initially increased and then decreased. The optimum content varied dependent on the type of industrial by-products. SEM test revealed that the improvement in compressibility can be attributed to cementation and filling effects. Additionally, we established a prediction model of compression amount based on the bounded function to offer reference for future construction and research.
关键词
工业废渣 /
固化 /
压缩特性 /
屈服应力 /
预测模型
Key words
industrial by-products /
solidification /
compressibility behavior /
yield stress /
prediction model
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