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作 者:安浩东 郭思瑶[1] 王坤[1] 吕换军 吴玉林 岳志豪 AN Haodong;GUO Siyao;WANG Kun;L Huanjun;WU Yulin;YUE Zhihao(School of Civil Engineering,Qingdao University of Technology,Qingdao 266525,China)
出 处:《青岛理工大学学报》2024年第6期34-42,101,共10页Journal of Qingdao University of Technology
基 金:山东省自然科学基金资助项目(ZR2020YQ43)。
摘 要:为解决淤泥力学性能差无法直接用于路基填筑以及大量工业废渣无法资源化利用的问题,基于以废治废理念,选取粉煤灰、微硅粉和电石渣3种工业废渣为固化原材料,对青岛胶州湾地区近海沉积淤泥进行固化。以掺水泥固化的淤泥为对照组,通过无侧限抗压试验、直剪试验、干湿循环试验和冻融循环试验一系列试验研究,评估S-FSC(工业废渣固化淤泥)的路用性能;采用X射线衍射和扫描电镜试验方法对S-FSC固化淤泥进行微观分析,揭示其固化机理。试验结果表明,粉煤灰、微硅粉和电石渣3种废渣之间的火山灰反应生成的水化硅酸钙、水化铝酸钙等产物,会将土颗粒紧密联结起来,填充土体孔隙,使固化淤泥的力学性能和耐久性能得到显著提高。In order to solve the problems that poor mechanical properties of silt cannot be directly used for roadbed filling and a large amount of industrial waste cannot be utilized as resources,based on the concept of waste to waste,this study selects three kinds of industrial waste as raw materials,namely,fly ash,microsilica fume and calcium carbide slag,to solidify the silt deposited in Qingdao’s Jiaozhou Bay area.The cement-mixed solidified silt is used as a control group.A series of experimental studies are conducted to evaluate the road performance of S-FSC(industrial waste solidified silt)through the unconfined compressive strength test,direct shear test,wet and dry cycle test and freeze-thaw cycle test.The X-ray diffraction and scanning electron microscope test methods are used to conduct microanalysis of the S-FSC solidified silt and to reveal its solidified mechanism.The test results indicate that products such as hydrated calcium silicate and hydrated calcium aluminate,generated by the volcanic ash reaction between fly ash,microsilica fume and calcium carbide slag,can tightly associate the soil particles and fill the pores of the soil at the same time,which leads to a significant improvement in the mechanical properties and the durability of the solidified silt.
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