再生细骨料墙体材料制备方法与力学性能试验研究

发布时间：2018-11-08 12:33

【摘要】：随着城镇化建设的推进以及自然灾害比如地震、台风的频繁发生,每年废弃的建筑垃圾逐渐增多,这些建筑垃圾严重污染环境,如何变废为宝,成为当前研究的热点之一。混凝土的再生利用就成为当前变废为宝解决环境污染途径之一。在再生骨料的制造利用过程中,再生细骨料用来制作墙体材料具有极大的可操作性。因为普通的墙体材料比如砌块、砂浆的力学性能要求并没有主体结构构件梁、板、柱的力学性能要求高。本文先做了再生细骨料的物理性能研究,比如颗粒级配、表观密度、堆积密度、空隙率、吸水率和含泥量等。接着阐述了再生细骨料混凝土空心砌块的生产技术,研究了再生细骨料混凝土空心砌块常温下和高温后残余的抗压强度,以及常温下的抗折强度。最后做了再生石灰水泥砂浆的密度、稠度、分层度和抗压强度试验研究。再生细骨料的物理性能研究按照《混凝土和砂浆用再生细骨料》要求的基本试验方法进行试验。配制再生细骨料混凝土空心砌块,考虑的影响因素是再生细骨料的含量,按照《混凝土小型空心砌块试验方法》进行抗压试验、抗折试验。再将该批次再生细骨料混凝土空心砌块置于不同高温环境,冷却后测定其质量和残余抗压强度值。通过再生细骨料配制再生石灰水泥砂浆,考虑再生细骨料取代率的影响,测定其稠度、分层度、密度和抗压强度。研究结果得出以下三点：(1)再生细骨料的含泥量、吸水率是比天然河砂有所增大,其余所测物理性能指标都是减小。(2)在影响再生混凝土空心砌块抗压和抗折的其余条件都不变的情况下,随着再生细骨料取代率的增加,抗压和抗折强度随之减小。在相同的再生细骨料取代率条件下,温度不断升高,冷却后抗压强度也随之降低,烧失量增大；在同样高温的条件下,随着再生细骨料取代率的增加,烧失量增大,抗压强度降低。(3)在取代率按10%的幅度从0-100%递增,再生石灰水泥砂浆的稠度和分层度的变化满足砌筑砂浆的要求,但是强度比天然水泥石灰砂浆的低。
[Abstract]:With the development of urbanization and the frequent occurrence of natural disasters such as earthquakes and typhoons, the waste of construction waste is gradually increasing every year. How to turn waste into treasure has become one of the hotspots of current research. The recycling of concrete has become one of the ways to solve the environmental pollution. In the process of manufacture and utilization of recycled aggregate, recycled fine aggregate can be used to make wall material with great maneuverability. The mechanical properties of common wall materials such as block and mortar do not require high mechanical properties of beam, plate and column. In this paper, the physical properties of recycled fine aggregate are studied, such as particle gradation, apparent density, packing density, porosity, water absorption and mud content. Then the production technology of recycled fine aggregate concrete hollow block is described. The compressive strength and flexural strength of recycled fine aggregate concrete hollow block at room temperature and high temperature are studied. Finally, the density, consistency, stratification and compressive strength of lime cement mortar are studied. The physical properties of recycled fine aggregate were studied in accordance with the basic test method required by "recycled fine aggregate for concrete and mortar". In the preparation of recycled fine aggregate concrete hollow block, the influence factor is the content of recycled fine aggregate. According to "Test method of concrete small Hollow Block", compressive test and flexural test are carried out. Then the batch recycled fine aggregate concrete hollow block was placed in different high temperature environment and its quality and residual compressive strength were measured after cooling. The consistency, stratification, density and compressive strength of regenerated fine aggregate were measured by taking into account the influence of the replacement rate of regenerated fine aggregate on the preparation of reclaimed lime cement mortar. The results are as follows: (1) the water absorption of recycled fine aggregate is higher than that of natural river sand. The other physical properties are reduced. (2) the compressive and flexural strength of recycled concrete hollow block decreases with the increase of the replacement ratio of recycled fine aggregate under the condition that the other conditions affecting the compressive and flexural resistance of recycled concrete hollow block are not changed. Under the same replacement rate of regenerated fine aggregate, the compression strength decreases and the burning loss increases with the increasing of temperature. At the same high temperature, with the increase of the replacement rate of regenerated fine aggregate, the loss of burning increases and the compressive strength decreases. (3) the substitution rate increases from 0-100% in the range of 10% to 100%. The change of consistency and delamination of relime cement mortar meets the requirements of masonry mortar, but its strength is lower than that of natural cement lime mortar.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU52

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