复合再生混凝土砌块试验研究

发布时间：2018-01-06 10:25

本文关键词：复合再生混凝土砌块试验研究　出处：《华侨大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着城市化的发展，废弃混凝土的处理成为了一大难题，同时国家在大力提倡建筑的节能，而目前大部分围护结构材料不能满足相关要求。因此本文从节能利废的角度出发，提出将再生混凝土经过破碎所得到的再生骨料用于生产再生混凝土空心砌块，再内填低密度泡沫混凝土保温材料，制得一种新型的环保节能自保温墙体材料，，这样既能为废弃混凝土的处理提供一条新的出路，又能减少建筑的耗能。本文采用试验研究、理论分析以及数值模拟相结合的方法对复合再生混凝土砌块进行了较为系统研究。首先，通过对泡沫混凝土配合比进行优化，得到了性能能够满足要求的低密度泡沫混凝土；其次，将低密度泡沫混凝土填充到再生混凝土砌块中，研制出复合再生混凝土砌块，并对砌块的基本物理力学性能进行了研究；最后，采用理论分析和数值模拟相结合的方法，研究了该种砌块的热工性能。通过研究发现，水灰比是影响低密度泡沫混凝土性能的主要因素，同时减水剂加入对于提高泡沫混凝土的性能起到了一定的作用。再生混凝土砌块在填充了低密度泡沫混凝土保温材料后，抗压强度提高作用不明显，但是砌块的抗折强度却提高了16.7%，使砌块承受复杂应力的性能得到增强。在热工性能方面，再生混凝土砌块砌体和复合再生混凝土砌块砌体传热系数理论计算结果分别为：2.15W/(m2·k)和1.40W/(m2·k)；砌块传热数值模拟结果表明，砌块的温度场基本符合热量传递的规律，复合再生混凝土砌块的等温线波动幅度明显大于再生混凝土砌块，在填充了保温材料的位置处的温度变化率明显大于其他部位，由于保温材料与砌块基材的导热系数相差较大，砌块肋处容易形成热桥，因此在传热过程中，大部分热量都是沿着砌块肋的位置传递出去；最后计算得到再生混凝土砌块和复合再生混凝土砌块传热系数的数值模拟结果分别为：2.18W/(m2·k)和1.44W/(m2·k)，相对误差在3%以内，满足精度要求。
[Abstract]:With the development of urbanization , the treatment of waste concrete has become a big problem . At the same time , most of the surrounding structure materials can not meet the relevant requirements . Therefore , the recycled aggregate obtained by breaking the recycled concrete is used in the production of recycled concrete hollow blocks , then the low density foam concrete heat insulation material is added to produce a novel environment - friendly and energy - saving self - insulation wall material , which can not only provide a new way for the treatment of waste concrete , but also can reduce energy consumption of the building . In this paper , a systematic study on the composite recycled concrete block is carried out by means of experimental research , theoretical analysis and numerical simulation . Firstly , by optimizing the mixing ratio of foam concrete , the low density foam concrete with satisfactory performance can be obtained ; secondly , the low density foam concrete is filled into the recycled concrete block , the basic physical and mechanical properties of the building block are studied ; and finally , the thermal performance of the building block is studied by combining theoretical analysis and numerical simulation . It is found that the water - cement ratio is the main factor affecting the performance of the low density foam concrete , while the addition of water reducing agent plays a certain role in improving the properties of the foam concrete . The results of the numerical simulation show that the temperature field of the building block is higher than that of the recycled concrete block . The numerical simulation results of the heat transfer coefficient of the recycled concrete block masonry and the composite recycled concrete block are respectively 2.18W / ( m2 路 k ) and 1.44W / ( m2 路 k ) . The relative error is within 3 % and the accuracy requirement is met .

【学位授予单位】：华侨大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU522.3

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