碱钢渣混凝土设计与性能的试验研究

发布时间：2019-04-17 13:53

【摘要】：钢渣作为冶炼钢铁时排出的一种工业废渣,2014年我国钢渣产生量为1亿吨左右,目前全国钢渣累积堆存近10亿吨,综合利用率仅为10%。大量的钢渣堆放如山,不仅占用了土地资源,更重要的是给环境带来了严重的污染。随着混凝土的不断复合化,以钢渣粉作为掺合料来取代一定的水泥量在混凝土的研究中较成熟,但如何发挥钢渣在混凝土中的最大活性及最大掺量还有待进行深入研究。本课题从化学激发钢渣等复合胶凝材料入手,以碱钢渣混凝土力学性能和工作性能为前提,对比研究了不同掺比胶凝体系在激发剂的激发作用下对应混凝土的力学性能以及耐久性能。并利用XRD、SEM等微观测试手段对混凝土胶凝体系和骨料-胶凝体系界面进行分析。试验结果表明:掺以60%钢渣、15%矿渣、5%硅灰及20%基准水泥,在5%复合激发剂的激发下,可配制出满足设计强度等级为C30的碱钢渣混凝土;增大矿渣掺量至35%、钢渣掺量降至40%,可制备出C40强度等级的混凝土,且具有良好的耐久性能;由5%粉煤灰替代矿渣配制出的混凝土力学强度基本没有影响,工作性能有所提高。微观试验表明:掺40%钢渣、35%矿渣试样的胶凝体系水化程度高、结构致密、骨料与胶凝体系的粘结性较好。
[Abstract]:Steel slag is a kind of industrial slag discharged from smelting iron and steel. In 2014, the production of steel slag in China is about 100 million tons. At present, the steel slag accumulates nearly 1 billion tons in China, and the comprehensive utilization rate is only 10%. A large number of steel slag piled up as a mountain, not only occupied the land resources, but also, more importantly, brought serious pollution to the environment. With the continuous compounding of concrete, it is more mature to use steel slag powder as admixture to replace a certain amount of cement in the study of concrete. However, how to exert the maximum activity and maximum amount of steel slag in concrete remains to be further studied. This subject starts with the composite cementitious materials such as chemically excited steel slag and takes the mechanical and working properties of the alkali steel slag concrete as the premise. The mechanical properties and durability of concrete with different ratio of cementitious system under the excitation of activator were studied in this paper. The interface of concrete cementitious system and aggregate-cementitious system was analyzed by XRD,SEM and other micro-testing methods. The test results show that the alkali steel slag concrete can be prepared by adding 60% steel slag, 15% slag, 5% silica fume and 20% benchmark cement under the excitation of 5% compound activator. When the slag content is increased to 35% and the steel slag content is reduced to 40%, the concrete with C40 strength grade can be prepared and has good durability. The mechanical strength of concrete prepared by 5% fly ash instead of slag has no effect and the working performance is improved. The microcosmic tests show that the cementitious system with 40% steel slag and 35% slag has high hydration degree, compact structure and good adhesion between aggregate and cementitious system.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528

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