掺入钢渣与偏高岭土水泥改性土的性能与微观机制
发布时间：2019-04-13 09:27
【摘要】：围绕工业废弃钢渣再生利用、高性能地聚合物偏高岭土在改性土中应用以及水泥改性土性能提升这3个问题,设计了掺入钢渣与偏高岭土后水泥改性土的一系列室内试验,从击实特性、抗压强度以及劈裂抗拉强度3个方面阐述改性土的宏观性能;同时开展了SEM,XRD,TGA与MIP等微观试验,明晰水化产物生成以及微观结构与孔隙分布的内在机制,进而为废弃物再生利用与改性土性能提升奠定理论基础。宏观试验结果表明:钢渣对水泥改性土击实特性和力学强度有所改善;引入偏高岭土后,上述性能得到明显改良和提升,改良后力学强度与偏高岭土掺量之间呈现先增加后减小的规律,最优掺入比(偏高岭土与水泥质量比值)为1/3~1/2;劈裂抗拉强度与无侧限抗压强度之间成正比关系,斜率比值为0.83。微观试验结果表明:钢渣和偏高岭土掺入后,不能改变水泥改性土中水化产物的类型,但改变了水化产物的包裹形式和数量,使得试样的微观结构和孔径分布发生改变,这是2种材料提升水泥改性土宏观力学强度,但改良效果有明显区别的内在原因。
[Abstract]:A series of laboratory tests of cement modified soil with steel slag and metakaolin were designed based on three problems: recycling of industrial waste steel slag, application of high performance geopolymer metakaolin in modified soil and improvement of performance of cement modified soil. The macroscopical performance of modified soil is expounded from three aspects: compaction property, compressive strength and splitting tensile strength. At the same time, microcosmic tests such as SEM,XRD,TGA and MIP were carried out to clarify the internal mechanism of the formation of hydration products and the microstructure and pore distribution, thus laying a theoretical foundation for waste recycling and improvement of the properties of modified soil. The macro-test results show that the compaction characteristics and mechanical strength of cement-modified soil are improved by steel slag. After the addition of metakaolin, the above-mentioned properties were obviously improved and improved, and the relationship between the mechanical strength and the content of metakaolin was first increased and then decreased, and the optimum mixing ratio (mass ratio of metakaolin to cement) was 1 ~ 3 ~ 1 ~ 2; The splitting tensile strength is proportional to the unconfined compressive strength, and the slope ratio is 0.83. The results of microcosmic test showed that the type of hydration products in cement modified soil could not be changed by mixing steel slag and metakaolin, but the form and quantity of hydration products were changed, and the microstructure and pore size distribution of samples were changed. This is the internal reason why the two kinds of materials enhance the macro-mechanical strength of cement-modified soil, but the improvement effect is obviously different.
【作者单位】： 东南大学交通学院;连云港港口集团;连云港赣榆港区建设现场指挥部;合肥工业大学资源与环境工程学院;
【基金】：国家自然科学基金项目(41572280,41372281) 江苏省六大人才高峰项目(2014-XCL-003) 东南大学优秀博士学位论文基金项目(YBJJ1634) 江苏省普通高校学术学位研究生创新计划项目(KYLX16-0240)
【分类号】：U414
本文编号：2457440
[Abstract]:A series of laboratory tests of cement modified soil with steel slag and metakaolin were designed based on three problems: recycling of industrial waste steel slag, application of high performance geopolymer metakaolin in modified soil and improvement of performance of cement modified soil. The macroscopical performance of modified soil is expounded from three aspects: compaction property, compressive strength and splitting tensile strength. At the same time, microcosmic tests such as SEM,XRD,TGA and MIP were carried out to clarify the internal mechanism of the formation of hydration products and the microstructure and pore distribution, thus laying a theoretical foundation for waste recycling and improvement of the properties of modified soil. The macro-test results show that the compaction characteristics and mechanical strength of cement-modified soil are improved by steel slag. After the addition of metakaolin, the above-mentioned properties were obviously improved and improved, and the relationship between the mechanical strength and the content of metakaolin was first increased and then decreased, and the optimum mixing ratio (mass ratio of metakaolin to cement) was 1 ~ 3 ~ 1 ~ 2; The splitting tensile strength is proportional to the unconfined compressive strength, and the slope ratio is 0.83. The results of microcosmic test showed that the type of hydration products in cement modified soil could not be changed by mixing steel slag and metakaolin, but the form and quantity of hydration products were changed, and the microstructure and pore size distribution of samples were changed. This is the internal reason why the two kinds of materials enhance the macro-mechanical strength of cement-modified soil, but the improvement effect is obviously different.
【作者单位】： 东南大学交通学院;连云港港口集团;连云港赣榆港区建设现场指挥部;合肥工业大学资源与环境工程学院;
【基金】：国家自然科学基金项目(41572280,41372281) 江苏省六大人才高峰项目(2014-XCL-003) 东南大学优秀博士学位论文基金项目(YBJJ1634) 江苏省普通高校学术学位研究生创新计划项目(KYLX16-0240)
【分类号】：U414
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1 雷小文;何晓鸣;;偏高岭土混凝土性能试验分析及应用[A];湖北省公路学会二○○九年学术年会论文集[C];2010年
，本文编号：2457440
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