玻化微珠保温砂浆力学性能及耐久性研究
发布时间：2018-09-04 14:54
【摘要】：随着社会的发展,人们对建筑节能问题越来越重视。建筑保温材料、保温体系不断涌现,玻化微珠是一种性能优异的无机保温材料,虽然应用在工程上比较多,但是自身还存在一些缺陷需要改进。本文以水泥基玻化微珠保温砂浆为研究对象,通过正交试验和单因素试验,研究了各组分材料对玻化微珠保温砂浆性能的影响,并研究了玻化微珠保温砂浆在耐久性方面的性能以及改善措施。试验表明:骨料和可再分散乳胶粉的掺量、粉煤灰取代水泥比率、水灰比四因素对玻化微珠保温砂浆的性能有着重要影响。对于保温砂浆的不同性能,各因素的影响作用大小不一样,为获得性能优异的玻化微珠保温砂浆配合比,必须综合考虑各因素之间的关系,调整最主要的影响因素。可再分散乳胶粉和纤维素醚作为外加剂,可显著改善玻化微珠保温砂浆的性能。可再分散乳胶粉可以增大砂浆的稠度,提高抗压强度,同时干密度也会增大。纤维素醚具有很好的保水作用,适量添加可以使保温砂浆具有良好的和易性,有利施工,纤维素醚同时还具有引气作用,可以降低砂浆的干密度。但是若纤维素醚添加过多,保温砂浆的粘度就会过大,反而会影响施工。利用正交试验和单因素试验对玻化微珠保温砂浆的配合比的试配结果,得到了玻化微珠保温砂浆的优化配合比:玻化微珠掺量28.5%,可再分散乳胶粉2%,纤维素醚0.5%,聚丙烯纤维0.45,粉煤灰取代水泥的比例为20%,水灰比为1.7。通过在玻化微珠保温砂浆中添加不同种类、长度的纤维,研究了其对玻化微珠保温砂浆性能的影响。纤维能提高砂浆的抗折强度,减小干缩,降低折压比,有利于保温砂浆的耐久性。其中玻璃纤维在改善抗压强度、线性收缩方面效果要好,聚丙烯纤维对抗折强度的影响效果更好,在纤维的长度上,在保温砂浆砂中浆添加玻璃纤维时,3mm的添加效果优于6mm。纤维能够提高玻化微珠的冲击韧性,随着纤维的掺量的加大,砂浆破坏出现“脆性”特征,聚丙烯纤维的掺量为0.15%时,砂浆的抗冲击性能最好。在热雨循环、冻融循环条件下,玻化微珠保温砂浆都出现较大的质量损失和强度损失,冻融循环造成的损失率更大。通过憎水处理的玻化微珠保温砂浆的强度和质量损失相比普通保温砂浆有一定的降低,但效果不是特别明显。
[Abstract]:With the development of society, people pay more and more attention to the problem of building energy conservation. Building insulation materials and thermal insulation system are emerging constantly. Glass microbeads is a kind of inorganic thermal insulation material with excellent performance. Although it is widely used in engineering, there are still some defects that need to be improved. In this paper, the effects of different components on the properties of cement based vitrified microbead insulation mortar were studied by orthogonal test and single factor test. The durability of vitrified microbead insulation mortar and its improvement measures are also studied. The results show that the content of aggregate and redispersible latex powder, the ratio of fly ash to cement, and the ratio of water to cement have important effects on the properties of glass microbead thermal insulation mortar. For the different properties of the insulating mortar, the effect of each factor is different. In order to obtain the mix ratio of the glass microbead insulation mortar with excellent performance, the relationship among the factors must be considered synthetically and the most important influencing factors should be adjusted. Redispersible emulsion powder and cellulose ether as admixture can improve the properties of glass microbead insulating mortar. The dispersible emulsion powder can increase the consistency of mortar, increase the compressive strength and increase the dry density. Cellulose ether has good water retention effect. Proper addition of cellulose ether can make the insulation mortar have good and easy, favorable construction, cellulose ether also has the function of air entraining, which can reduce the dry density of mortar. However, if cellulose ether is added too much, the viscosity of insulation mortar will be too large, but will affect the construction. By using orthogonal test and single factor test, the mixing ratio of vitrified microbead insulation mortar was tested. The optimum mix ratio of vitrified microbead insulation mortar was obtained as follows: the proportion of vitrified microbeads was 28.5wt%, the amount of dispersed emulsion powder was 2%, cellulose ether 0.5%, polypropylene fiber 0.45, the ratio of fly ash replacing cement 20 and the water-cement ratio 1.7. The effects of different types and lengths of fibers on the properties of vitrified microbead insulation mortar were studied. Fiber can improve the flexural strength of mortar, reduce dry shrinkage, reduce the ratio of folding and pressure, which is beneficial to the durability of insulation mortar. The effect of glass fiber on improving compressive strength and linear shrinkage is better than that of polypropylene fiber on flexural strength. In terms of fiber length, the addition effect of glass fiber 3mm in insulating mortar is better than that of 6 mm. Fiber can improve the impact toughness of vitrified microbeads. With the increase of fiber content, the damage of mortar appears "brittle" characteristic. When the content of polypropylene fiber is 0.15, the impact resistance of mortar is the best. Under the conditions of hot rain cycle and freeze-thaw cycle, the mass loss and strength loss of vitrified microbead thermal insulation mortar are larger, and the loss rate caused by freeze-thaw cycle is even greater. The strength and quality loss of glass microbead insulation mortar treated by hydrophobic treatment is lower than that of ordinary insulating mortar, but the effect is not particularly obvious.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ177.6
本文编号：2222493
[Abstract]:With the development of society, people pay more and more attention to the problem of building energy conservation. Building insulation materials and thermal insulation system are emerging constantly. Glass microbeads is a kind of inorganic thermal insulation material with excellent performance. Although it is widely used in engineering, there are still some defects that need to be improved. In this paper, the effects of different components on the properties of cement based vitrified microbead insulation mortar were studied by orthogonal test and single factor test. The durability of vitrified microbead insulation mortar and its improvement measures are also studied. The results show that the content of aggregate and redispersible latex powder, the ratio of fly ash to cement, and the ratio of water to cement have important effects on the properties of glass microbead thermal insulation mortar. For the different properties of the insulating mortar, the effect of each factor is different. In order to obtain the mix ratio of the glass microbead insulation mortar with excellent performance, the relationship among the factors must be considered synthetically and the most important influencing factors should be adjusted. Redispersible emulsion powder and cellulose ether as admixture can improve the properties of glass microbead insulating mortar. The dispersible emulsion powder can increase the consistency of mortar, increase the compressive strength and increase the dry density. Cellulose ether has good water retention effect. Proper addition of cellulose ether can make the insulation mortar have good and easy, favorable construction, cellulose ether also has the function of air entraining, which can reduce the dry density of mortar. However, if cellulose ether is added too much, the viscosity of insulation mortar will be too large, but will affect the construction. By using orthogonal test and single factor test, the mixing ratio of vitrified microbead insulation mortar was tested. The optimum mix ratio of vitrified microbead insulation mortar was obtained as follows: the proportion of vitrified microbeads was 28.5wt%, the amount of dispersed emulsion powder was 2%, cellulose ether 0.5%, polypropylene fiber 0.45, the ratio of fly ash replacing cement 20 and the water-cement ratio 1.7. The effects of different types and lengths of fibers on the properties of vitrified microbead insulation mortar were studied. Fiber can improve the flexural strength of mortar, reduce dry shrinkage, reduce the ratio of folding and pressure, which is beneficial to the durability of insulation mortar. The effect of glass fiber on improving compressive strength and linear shrinkage is better than that of polypropylene fiber on flexural strength. In terms of fiber length, the addition effect of glass fiber 3mm in insulating mortar is better than that of 6 mm. Fiber can improve the impact toughness of vitrified microbeads. With the increase of fiber content, the damage of mortar appears "brittle" characteristic. When the content of polypropylene fiber is 0.15, the impact resistance of mortar is the best. Under the conditions of hot rain cycle and freeze-thaw cycle, the mass loss and strength loss of vitrified microbead thermal insulation mortar are larger, and the loss rate caused by freeze-thaw cycle is even greater. The strength and quality loss of glass microbead insulation mortar treated by hydrophobic treatment is lower than that of ordinary insulating mortar, but the effect is not particularly obvious.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ177.6
【参考文献】
相关期刊论文 前2条
1 方萍;吴懿;龚光彩;;膨胀玻化微珠的显微结构及其吸湿性能研究[J];材料导报;2009年10期
2 巩永忠;苑峰;孙艳;;国内建筑外墙外保温材料现状与发展前景[J];新型建筑材料;2006年10期
相关硕士学位论文 前1条
1 项道阳;薄抹灰外墙外保温系统耐候性试验研究[D];北京工业大学;2008年
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