本文選題：聚丙烯纖維　切入點(diǎn)：發(fā)泡混凝土試塊　出處：《河南理工大學(xué)》2014年碩士論文

【摘要】：本文主要為探索性實(shí)驗(yàn),目的是為了開(kāi)發(fā)出新型的墻體材料,該墻體材料應(yīng)該具有輕質(zhì)、高強(qiáng)、節(jié)能、利廢、施工方便且價(jià)格便宜等優(yōu)點(diǎn)。本文采用水泥、砂子、石膏、粉煤灰、聚丙烯纖維等原材料研究自保溫發(fā)泡混凝土新型墻體材料。本次研究通過(guò)對(duì)比實(shí)驗(yàn),固定次要因素,變化主要因素,逐一測(cè)試單一因素對(duì)發(fā)泡混凝土的抗壓強(qiáng)度和劈裂抗拉強(qiáng)度等力學(xué)性能的影響、對(duì)發(fā)泡混凝土的干表觀密度和吸水率等物理性能的影響、對(duì)發(fā)泡混凝土的導(dǎo)熱系數(shù)的影響,并且最后理論分析了孔結(jié)構(gòu)對(duì)各項(xiàng)性能的影響。本實(shí)驗(yàn)采用化學(xué)發(fā)泡劑,比以往的物理發(fā)泡劑發(fā)泡效果更好,采用常溫養(yǎng)護(hù),實(shí)驗(yàn)過(guò)程更加簡(jiǎn)單,操作更加方便。由實(shí)驗(yàn)可知,水灰比從0.45增加到0.6,分別研究發(fā)泡混凝土7天、14天、28天的各項(xiàng)性能,從物理性能和力學(xué)性能等方面綜合考慮,選出最優(yōu)水灰比為0.5;固定上次最優(yōu)水灰比,用砂子替換水泥,隨著替換量的增多,發(fā)泡混凝土的各項(xiàng)性能(物理性能和力學(xué)性能)變化顯著,同樣經(jīng)過(guò)綜合考慮,最后選出最優(yōu)摻量,即摻量為1500g;固定上次的最優(yōu)實(shí)驗(yàn)結(jié)果(砂子摻量的數(shù)據(jù)),用石膏替換砂子,石膏的替換量從200g增加到800g,發(fā)泡混凝土的性能(物理性能和力學(xué)性能)變化顯著,最后選出最優(yōu)的摻量為600g;然后固定上次實(shí)驗(yàn)的最優(yōu)結(jié)果(石膏摻量的數(shù)據(jù)),用粉煤灰去替代水泥,即替換量從500g增加到1700g,發(fā)泡混凝土的性能變化非常顯著(除了物理性能和力學(xué)性能還有發(fā)泡的現(xiàn)象),但由于本次研究的目的為“變廢為寶”,故選定900g的摻量為最優(yōu)摻量;最后一步摻加聚丙烯纖維,同時(shí)利用上面實(shí)驗(yàn)的最優(yōu)摻量,可以看出,聚丙烯纖維可以大大改善發(fā)泡混凝土的性能,使之朝著各項(xiàng)性能有利的方向發(fā)展。研究結(jié)果表明:粉煤灰的摻加使發(fā)泡混凝土的各項(xiàng)性能朝著不利的方向發(fā)展,需要嚴(yán)格控制其摻加量,聚丙烯纖維可大大提高發(fā)泡混凝土試塊的物理力學(xué)性能,彌補(bǔ)粉煤灰摻加后帶來(lái)的缺陷,其是主要的增強(qiáng)材料。本次選出合適的水灰比,控制住砂子、石膏、粉煤灰的摻量,利用聚丙烯纖維的增強(qiáng)作用,仍然有可能做出性能合適的發(fā)泡混凝土試塊,并且有可能達(dá)到墻體材料的要求,從而生產(chǎn)出性能合格的綠色墻體材料。
[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.
【學(xué)位授予單位】：河南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU522.3

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