首页|三种固废改性生土材料配方设计及力学性能研究

三种固废改性生土材料配方设计及力学性能研究

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为改善生土材料的力学性能,本研究以铁尾矿、煤矸石、电石渣、油泥与水泥等材料作为掺和料对生土进行改性.基于单形格子法设计配方,对3种配方、180个改性生土试件进行抗压强度试验,研究不同因素对试件破坏形态、抗压强度和试验数据离散性的影响;利用频数分析法,研究了固废改性生土材料的最优配方;通过CT扫描,从细观层面分析受荷后材料内部的分形和孔隙.结果表明:改性生土试件抗压破坏形态基本相同,极限位移受掺料影响显著.以煤矸石与电石渣、铁尾矿与水泥、油泥与水泥作为掺和料均可大幅提高改性生土试件的力学性能,掺和料种类、掺量对改性生土试件强度及数据离散性影响显著.经过频数寻优,3种配方的理想强度掺和料配比分别为1)铁尾矿 12.1％～19.5％(质量分数,下同)、水泥 13.9％～19.1％、生土 65.5％～69.9％;2)电石渣 6.7％～14.1％、煤矸石 8.9％～11.8％、生土 76.7％～81.8％;3)油泥 11.4％～14.4％、水泥 17.4％～19.4％、生土 67.1％～70.5％.材料内部的分形和孔隙特征稳定,表现出较小的波动性和良好的密实性.
Formula Design and Mechanical Properties of Three Kinds of Modified Raw Soil Materials Mixed with Solid Waste
In order to improve the mechanical properties of raw soil materials,iron tailings,gangue,calcium carbide slag,oil sludge and cement were used as admixtures to modify raw soil.On the basis of the monomorphic lattice method,the effects of different factors on the failure morphology,compressive strength and data discreteness of the specimen were studied through compressive test of 180 modified raw soil specimens of three modified formulas.Using the frequency analysis method,the optimal formula of solid waste modified raw soil material was studied.Then,the fractal and pore structures inside the loaded material were analyzed at a microscopic level through CT scanning.The results show that the compressive failure forms of different admixture-modified raw soil specimens are basically the same,but the admixture significantly affects the limit displacement.Gangue and calcium carbide slag,iron tailings and cement,oil sludge and cement as raw soil admixtures can greatly improve the mechanical properties of modified raw soil specimens,the type and the amount of admixture have a significant impact on the strength and data discreteness of modified raw soil specimens.After frequency optimization,the ideal strength admixture ratios for the three formulas are 1)iron tailings 12.1％～19.5％(mass fraction,the same below),cement 13.9％～19.1％and raw soil 65.5％～69.9％;2)calcium carbide slag 6.7％～14.1％,coal gangue 8.9％～11.8％and raw soil 76.7％～81.8％;3)oil sludge 11.4％～14.4％,cement 17.4％～19.4％and raw soil 67.1％～70.5％.The fractal and pore characteristics inside the material are stable,exhibiting small fluctuations and good compactness.

modified raw soilsolid waste utilizationcompressive strengthformula designfrequency analysis

张坤、付智勇、张凌寒、杨文豪、兰官奇、朱熹育

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西安石油大学土木工程学院,西安 710065

西安石油大学博士后创新基地/基建处,西安 710065

西安石油大学机械工程学院,西安 710065

改性生土 固废利用 抗压强度 配方设计 频数分析法

国家自然科学基金陕西省自然科学基础研究计划西安市科技计划陕西省重点研发计划研究生创新与实践能力培养计划西安石油大学"立德树人"研究课题

523082042022JQ-3012022JHRYFW-01252022GY-431YCS23214275LD202214

2024

硅酸盐通报
中国硅酸盐学会 中材人工晶体研究院

硅酸盐通报

CSTPCD北大核心
影响因子：0.698
ISSN：1001-1625
年,卷(期)：2024.43(2)
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