自保温聚丙烯轻质墙体砌块试验研究

发布时间：2018-04-08 18:14

本文选题：聚丙烯纤维　切入点：发泡混凝土试块　出处：《河南理工大学》2014年硕士论文

【摘要】：本文主要为探索性实验,目的是为了开发出新型的墙体材料,该墙体材料应该具有轻质、高强、节能、利废、施工方便且价格便宜等优点。本文采用水泥、砂子、石膏、粉煤灰、聚丙烯纤维等原材料研究自保温发泡混凝土新型墙体材料。本次研究通过对比实验,固定次要因素,变化主要因素,逐一测试单一因素对发泡混凝土的抗压强度和劈裂抗拉强度等力学性能的影响、对发泡混凝土的干表观密度和吸水率等物理性能的影响、对发泡混凝土的导热系数的影响,并且最后理论分析了孔结构对各项性能的影响。本实验采用化学发泡剂,比以往的物理发泡剂发泡效果更好,采用常温养护,实验过程更加简单,操作更加方便。由实验可知,水灰比从0.45增加到0.6,分别研究发泡混凝土7天、14天、28天的各项性能,从物理性能和力学性能等方面综合考虑,选出最优水灰比为0.5;固定上次最优水灰比,用砂子替换水泥,随着替换量的增多,发泡混凝土的各项性能(物理性能和力学性能)变化显著,同样经过综合考虑,最后选出最优掺量,即掺量为1500g;固定上次的最优实验结果(砂子掺量的数据),用石膏替换砂子,石膏的替换量从200g增加到800g,发泡混凝土的性能(物理性能和力学性能)变化显著,最后选出最优的掺量为600g;然后固定上次实验的最优结果(石膏掺量的数据),用粉煤灰去替代水泥,即替换量从500g增加到1700g,发泡混凝土的性能变化非常显著(除了物理性能和力学性能还有发泡的现象),但由于本次研究的目的为“变废为宝”,故选定900g的掺量为最优掺量;最后一步掺加聚丙烯纤维,同时利用上面实验的最优掺量,可以看出,聚丙烯纤维可以大大改善发泡混凝土的性能,使之朝着各项性能有利的方向发展。研究结果表明:粉煤灰的掺加使发泡混凝土的各项性能朝着不利的方向发展,需要严格控制其掺加量,聚丙烯纤维可大大提高发泡混凝土试块的物理力学性能,弥补粉煤灰掺加后带来的缺陷,其是主要的增强材料。本次选出合适的水灰比,控制住砂子、石膏、粉煤灰的掺量,利用聚丙烯纤维的增强作用,仍然有可能做出性能合适的发泡混凝土试块,并且有可能达到墙体材料的要求,从而生产出性能合格的绿色墙体材料。
[Abstract]:The purpose of this paper is to develop a new type of wall material, which should have the advantages of light weight, high strength, energy saving, waste benefit, convenient construction and cheap price.In this paper, cement, sand, gypsum, fly ash, polypropylene fiber and other raw materials are used to study new wall materials of self-insulating foamed concrete.In this study, the influence of single factor on the compressive strength and splitting tensile strength of foamed concrete was tested one by one by comparing experiments, fixing secondary factors and changing main factors, and testing the effect of single factor on the mechanical properties of foamed concrete, such as compressive strength and splitting tensile strength.The effects on the physical properties such as dry apparent density and water absorption of foamed concrete and on the thermal conductivity of foamed concrete are also discussed. Finally, the influence of pore structure on the properties of foamed concrete is theoretically analyzed.The chemical foaming agent is used in this experiment, and the foaming effect is better than the physical foaming agent in the past. The experiment process is simpler and the operation is more convenient when curing at room temperature.The experimental results show that the water-cement ratio is increased from 0.45 to 0.6. The properties of foamed concrete in 14 days and 28 days are studied respectively. The optimum water-cement ratio is 0.5 and the optimum water-cement ratio is fixed from physical and mechanical properties.When the cement is replaced by sand, the properties (physical and mechanical properties) of foamed concrete change significantly with the increase of replacement amount.That is to say, the content of gypsum is 1500g, and the best experimental results (the data of sand content) are fixed. The replacement amount of gypsum increases from 200g to 800g, and the properties (physical and mechanical properties) of foamed concrete change significantly.Finally, the optimal dosage of 600g was selected, and the optimal results of the previous experiment were fixed (the data of gypsum content was used to replace cement with fly ash).That is to say, with the increase of substitution amount from 500g to 1700g, the performance of foamed concrete changes remarkably (besides physical and mechanical properties, there is foaming phenomenon, but because the purpose of this study is to "turn waste into treasure", the optimum dosage of 900g is chosen;The last step is to add polypropylene fiber and the optimum content of the experiment above shows that polypropylene fiber can greatly improve the performance of foamed concrete and make it develop towards various performance favorable direction.The results show that the properties of foamed concrete will develop in a disadvantageous direction with the addition of fly ash. It is necessary to strictly control the amount of fly ash, and polypropylene fiber can greatly improve the physical and mechanical properties of foamed concrete test blocks.It is the main reinforcement material to make up for the defects caused by the addition of fly ash.This time choosing the appropriate water-cement ratio, controlling the amount of sand, gypsum and fly ash, and using the reinforcement of polypropylene fiber, it is still possible to make the appropriate performance of foamed concrete test blocks, and possibly to meet the requirements of wall materials.In order to produce a qualified performance of green wall materials.
【学位授予单位】：河南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU522.3

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