秸秆菱镁混凝土物理力学性能试验研究

发布时间：2018-01-23 23:40

本文关键词： 秸秆菱镁混凝土创新型工艺物理力学性能拟静力试验　出处：《山东农业大学》2017年硕士论文　论文类型：学位论文

【摘要】：秸秆菱镁混凝土是以秸秆纤维为加筋材料,以菱镁水泥作为胶结材料,掺加适当比例的矿物填料和添加剂,加水制成的具有一定强度、保温性能和较好稳定性的新型环保节能材料。旨在突破传统秸秆类建材秸秆掺量低、强度低等缺点,并充分利用秸秆的保温性能在农村建房,打造绿色生态建筑。本文对传统秸秆类混凝土的研究现状和不能大规模推广的原因进行了分析。自行设计了秸秆混凝土的专用制作装置来研制新型秸秆混凝土。确定了新型秸秆混凝土的原材料组成,并探索性的对秸秆的处理和选材、卤水的制作和浓度的取值、胶凝材料的制备和配比取值、氯氧镁水泥的性能等进行了研究。形成了一套完善的秸秆混凝土试件的制作工艺技术。试验设计了600 Kg/m3、800 Kg/m3、1000 Kg/m3三个等级的秸秆菱镁混凝土正交试验组,研究秸秆掺量、胶凝材料配比和砂掺量对秸秆混凝土抗压强度、弹性模量、干密度的影响规律。并对正交试验结果进行了系统的分析,包括极差分析、点图分析、方差分析。试验确定了三个密度等级的秸秆混凝土的最优配合比。并根据试验结果研究低密度秸秆混凝土抗压强度数据规律,设计1600 Kg/m3、1800 Kg/m3两个密度等级的秸秆混凝土,使其达到承重砌块强度的要求。然后对秸秆菱镁混凝土立方体试件的受压破坏形态进行分析,并绘制应力-应变曲线,计算弹性模量。对不同密度秸秆菱镁混凝土试件的应力-应变曲线进行综合性分析,研究其受压变形规律。然后将不同密度等级的秸秆菱镁混凝土与其它几种混凝土的抗压强度、弹性模量和干密度进行了系统性对比,证明了秸秆菱镁混凝土性能的优越。本文对不同密度等级的秸秆菱镁混凝土的导热系数和软化系数进行了测试。证明了秸秆混凝土其优良的保温性能,并针对秸秆菱镁混凝土的耐水性能差的缺点提出了改进方案。而且应用设计了秸秆菱镁混凝土预制中型砌块和轻钢骨架-秸秆混凝土混合结构墙体,并针对墙体的抗震性能进行了拟静力试验,充分证明了秸秆菱镁混凝土砌块建造墙体的优越的抗震性能。
[Abstract]:Straw magnesite concrete is made of straw fiber as reinforcement material, magnesium magnesite cement as cementing material, with appropriate proportion of mineral fillers and additives, and water has a certain strength. The aim of this paper is to break through the disadvantages of low mixing amount and low strength of traditional straw building materials, and make full use of the thermal insulation property of straw to build houses in rural areas. In this paper, the research status of traditional straw concrete and the reasons why it can not be popularized on a large scale are analyzed. A special production device of straw concrete is designed to develop new straw concrete. The raw material composition of new straw concrete was determined. And explore the treatment and selection of straw, brine production and concentration of the value, the preparation of cementitious materials and the ratio of values. The properties of magnesium oxychloride cement were studied. A set of perfect processing technology of straw concrete specimen was formed. The 600 kg / m ~ (3 +) ~ (800) Kg/m3 was designed. The compressive strength and elastic modulus of straw concrete with three grades of 1000 Kg/m3 were studied in the orthogonal test group, including the content of straw, the proportion of cementing material and the amount of sand. The effects of dry density on the results of orthogonal test are analyzed systematically, including range analysis and point diagram analysis. Variance analysis. The optimum mix ratio of straw concrete with three density grades was determined. According to the experimental results, the compressive strength data of low density straw concrete was studied, and the design was made at 1600 Kg/m3. Two density grades of straw concrete at 1800 Kg/m3 made it meet the requirements of bearing block strength. Then the compressive failure pattern of cubic specimen of straw magnesite concrete was analyzed. The stress-strain curve was drawn and the elastic modulus was calculated. The stress-strain curves of different density straw magnesite concrete specimens were comprehensively analyzed. Then, the compressive strength, elastic modulus and dry density of straw magnesite concrete with different density grades were systematically compared with other concrete. In this paper, the thermal conductivity and softening coefficient of straw magnesite concrete with different density grades were tested, and the excellent thermal insulation performance of straw magnesite concrete was proved. According to the shortcoming of poor water resistance of straw magnesite concrete, the improvement scheme is put forward, and the precast medium block of straw magnesite concrete and the mixed structure wall of light steel skeleton and straw concrete are designed. The quasi static test on the seismic behavior of the wall is carried out, which fully proves the excellent seismic performance of the wall constructed by the straw magnesite concrete block.
【学位授予单位】：山东农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528

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