碱矿渣混凝土力学性能研究

发布时间：2018-04-03 02:22

本文选题：碱矿渣混凝土　切入点：流动性　出处：《湖南工业大学》2017年硕士论文

【摘要】：充分利用冶金工业副产物粒化高炉矿渣生产碱激发高性能水泥,成为了当前建材领域热门研究方向之一,这对于建立资源节约型、环境友好型社会具有重要意义。近些年来,人们对于矿渣的利用进行了大量的研究,并取得了一定的成果。目前矿渣主要是作为填充料或者取代部分硅酸盐水泥熟料生产矿渣水泥,亦或者作为碱激发水泥的主要原料。本课题主要研究了碱矿渣混凝土抗压强度、静态应力-应变性能以及动态应力-应变性能,与此同时对流动性也进行了一定的研究。通过变换碱掺量、粉煤灰掺量、石灰掺量和硅灰掺量等因素,来分析其对碱矿渣混凝土流动性和立方体抗压强度的影响。研究结果表明:粉煤灰能改善和易性,掺量为25%较好,强度不会明显下降;水玻璃掺量越高,流动性越好,强度也越高;偏高岭土能显著降低强度和流动性,掺量为30%时混凝土几乎没有强度;硅灰会引起流动性与早期强度下降,但对后期强度具有一定的提升作用;石灰能提高早期强度,但会引起后期强度降低,并对流动性具有一定的不利影响。通过改变粉煤灰掺量、水胶比和碱掺量,研究其对碱矿渣混凝土静态应力-应变性能和动态应力-应变性能的影响。静态应力-应变试验结果表明:碱矿渣混凝土应力-应变曲线形状与普通混凝土相差不大,但上升段具有一定的离散性,下降段则明显更加陡峭;混凝土峰值应变随着粉煤灰所占比例增加与水胶比增大而降低,随着碱掺量增加而增加;碱矿渣混凝土立方体抗压强度与棱柱体抗压强度的比值约为1.09。动态应力-应变试验结果表明:掺入50%粉煤灰或者水玻璃掺量为16%时均能显著提高混凝土的应变率敏感性;动态抗压强度随应变率增加基本呈线性增加;峰值应变随着应变率增加而呈增加的趋势。
[Abstract]:Make full use of metallurgical industry by-product granulated blast furnace slag production of alkali activated cement high performance, has become one of the hot research direction in the field of building materials, which has important significance to build a resource-saving, environment-friendly society. In recent years, people have done a lot of research for slag utilization, and achieved certain results. The slag is mainly used as filling material or replace part of Portland cement clinker slag cement production, or as the main raw material of alkali activated cement. This paper mainly studies the compressive strength of alkali activated slag concrete, static stress-strain properties and dynamic stress-strain properties at the same time, the liquidity is studied. By changing alkali admixture, fly ash, lime and factors of silica fume, to analyze the fluidity of alkali slag concrete and cube compressive strength. Ring. The results show that fly ash can improve the workability, volume 25% is good, strength will not be significantly decreased; water glass content is higher, the better liquidity, higher strength; metakaolin can significantly reduce the strength and fluidity of concrete admixture of 30% silica fume will almost no strength; decrease the fluidity and early strength, but has the promotion effect on the later strength; lime can improve the early strength, but will cause a decrease in late strength, and has a certain negative impact on liquidity. By changing the amount of fly ash, water cement ratio and alkali dosage, on the alkali slag concrete static stress the stress-strain properties and dynamic stress-strain properties. The static stress-strain test results show that the alkali slag concrete stress-strain curve and ordinary concrete are similar, but the ascent has discreteness, decreased significantly more The steep increase of concrete; peak strain with fly ash proportion and water cement ratio decreases, with increasing alkali content increasing; the ratio of compressive strength of alkali activated slag concrete compressive strength and prism is about 1.09. dynamic stress-strain test results show that the incorporation of 50% fly ash or water glass dosage 16% all can significantly improve the strain rate sensitivity of concrete; dynamic compressive strength increases with the increase of strain rate increases linearly with the increase of strain rate; the peak strain and showed an increasing trend.

【学位授予单位】：湖南工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528

【参考文献】