漂珠对玻化微珠保温混凝土性能的影响试验研究

发布时间：2018-03-23 10:27

本文选题：粉煤灰漂珠　切入点：玻化微珠保温混凝土　出处：《太原理工大学》2017年硕士论文

【摘要】：玻化微珠保温混凝土具有保温、承重、节能、质轻等优点,符合国家建筑节能的标准,具有广阔的应用前景。近年来,在节能减排的大背景下,要满足我国在建筑节能方面提出的更高要求,需要对玻化微珠保温混凝土保温性能进行优化。粉煤灰是一种排放量大且严重污染环境的工业废料。漂珠是其在燃烧过程中产生的一种固体废弃物,具有自身强度高(约为玻化微珠的6倍)、导热系数小的特点。因此,在保证玻化微珠保温混凝土力学性能的前提下,以取代砂子的方式,将漂珠作为细骨料加入到玻化微珠保温混凝土中是优化其保温性能的一种重要途径。本文在C35等级的玻化微珠保温混凝土的基础上,研究了漂珠细度、取代率(取代砂子)对玻化微珠保温混凝土工作性能、力学性能、热工性能的影响规律。主要包括:1.不同漂珠细度对玻化微珠保温混凝土性能的影响研究。研究了三种不同细度(1.9、2.5、3.2)漂珠在取代率为50%时对玻化微珠保温混凝土工作性能、力学性能以及保温性能指标的影响规律,研究结果表明:漂珠取代砂子对保温混凝土抗压强度有不利影响,抗压强度降低幅度为10.9%~21.5%,但对导热系数具有明显的改善作用,其降低幅度为14.9%~27.6%。满足保温混凝土设计强度下传热性能最优对应的漂珠细度为1.9。2.不同漂珠取代率对玻化微珠保温混凝土性能的影响研究。研究了五种不同取代率(0、25%、50%、75%、100%)对玻化微珠保温混凝土的工作性能、力学性能以及保温性能指标的影响规律,研究结果表明:(1)随着漂珠取代率的增大,保温混凝土的坍落度先增大后减小,漂珠取代率为50%和75%时,拌合物和易性能较好。(2)随着漂珠取代率的增大,保温混凝土的劈裂抗拉强度、抗折强度、轴心抗压强度、弹性模量减小。当漂珠取代率大于50%时,其抗压强度降低幅度明显增大,且不能够满足设计强度要求。掺有漂珠的保温混凝土的拉压比、折压比均高于基准值,漂珠的掺入,一定程度可以改善保温混凝土的延性性能。(3)随着漂珠取代率的增大,保温混凝土的导热系数逐渐减小。当取代率从25%到100%时,其导热系数下降幅度为6.4%~34%。(4)满足混凝土设计强度下传热性能最优对应的漂珠取代率为50%。综合分析漂珠细度、取代率对玻化微珠保温混凝土工作性能、力学性能、热工性能的影响规律,得到相关性能指标间的关系式,分析并得出漂珠细度为1.9,取代率为50%时保温混凝土的性能最优。
[Abstract]:Glass microbead insulation concrete has the advantages of heat preservation, load bearing, energy saving, light weight and so on. It conforms to the national building energy saving standard and has a broad application prospect. In recent years, under the background of energy saving and emission reduction, In order to meet the higher requirements of our country in building energy conservation, It is necessary to optimize the thermal insulation performance of glass microbead insulation concrete. Fly ash is a kind of industrial waste with high emission and serious environmental pollution. Drifter bead is a kind of solid waste produced in the process of combustion. It has the characteristics of high strength (about 6 times of vitrified microbeads and low thermal conductivity). Therefore, on the premise of ensuring the mechanical properties of glass microbeads thermal insulation concrete, the method of replacing sand is adopted. It is an important way to optimize its thermal insulation performance by adding drifted beads as fine aggregate into glass microbead insulation concrete. Based on the C35 grade glass microbead insulation concrete, the fineness of drifted beads is studied in this paper. The working performance and mechanical properties of glass microbead insulation concrete with substitution ratio (replacing sand), The influence law of thermal properties mainly includes: 1. Study on the effect of different drifters fineness on the properties of glass microbead insulating concrete. The working performance of three kinds of bead beads on glass microbeads insulation concrete is studied when the substitution ratio is 50. The influence of mechanical properties and thermal insulation properties on the compressive strength of insulating concrete is studied. The results show that the compressive strength of insulating concrete is adversely affected by the replacement of sand by drifters, and the decrease of compressive strength is 10.9% and 21.5m, but the thermal conductivity is obviously improved. The decrease range is 14.9% and 27.6%. The optimum heat transfer performance corresponding to the heat transfer performance of insulating concrete is 1.9.2. The effect of different replacement ratio of floating beads on the properties of glass microbead insulating concrete is studied. The working performance of glass microbead insulation concrete, The results show that the slump of insulating concrete increases first and then decreases with the increase of the replacement ratio of drift-bead, and the substitution ratio of drift-bead is 50% and 75% respectively. With the increase of the replacement ratio, the splitting tensile strength, flexural strength, axial compressive strength and elastic modulus of insulating concrete decrease. The decrease range of compressive strength is obviously increased, and it can not meet the design strength requirement. The ratio of tension to compression and the ratio of bending to compression of the insulation concrete with drifters are all higher than the reference value, and the admixture of the drifters is not satisfied with the requirements of the design strength. The ductility of insulating concrete can be improved to a certain extent.) with the increase of the replacement ratio of bleach beads, the thermal conductivity of insulating concrete decreases gradually. When the replacement ratio ranges from 25% to 100%, The decreasing range of thermal conductivity is 6.4x34.) the optimum heat transfer performance corresponding to the optimum heat transfer performance of concrete is 50. The comprehensive analysis of the fineness of drift-bead and its effect on the working performance and mechanical properties of glass bead insulation concrete, The influence law of thermal performance is obtained, and the relationship between the related performance indexes is obtained. The results show that the properties of insulating concrete are optimal when the fineness of drift-bead is 1.9 and the substitution rate is 50.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528

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