外涂和内掺有机硅对水泥砂浆的性能影响研究

发布时间：2018-04-07 00:19

本文选题：有机硅　切入点：水泥砂浆　出处：《武汉轻工大学》2015年硕士论文

【摘要】：对混凝土进行有机硅的防水处理,可极大减少外界环境的有害介质侵蚀混凝土,主要有两种的处理方式:一、对混凝土结构表层进行涂刷处理;二、直接将有机硅按一定的比例掺入混凝土,提高整体混凝土质量,从而增大其抵抗有害介质侵蚀的能力。本文简要介绍了有机硅防水剂的国内外发展现状、研究意义及防水机理,通过几组试验对比分析有机硅外涂与内掺效果,主要研究内容如下:一、通过吸水率、防水性能试验,得出外涂和内掺都能很大程度上降低水泥砂浆的吸水率。外涂有机硅时由于在水泥砂浆表面形成一层膜使得聚合物水泥砂浆具较强的疏水性;而内掺有机硅聚合物的水泥砂浆试件由于结构发生变化,试样内部孔隙率降低,具有良好的疏水性。二、通过抗折强度、抗压强度试验,得出外涂有机硅水泥砂浆试样较基准水泥砂浆的抗折强度、抗压强度变化不大,而内掺有机硅水泥砂浆试样较基准水泥砂浆抗折强度、抗压强度稍有下降趋势,但下降程度不明显。三、通过抗冻融试验、抗酸碱试验、抗碳化试验、大板抗裂试验等一系列耐久性试验,有机硅改性水泥砂浆的耐久性均优于未改性水泥砂浆,并且内掺有机硅聚合物水泥砂浆在某种程度上来说稍优于外涂水泥砂浆的耐久性改良效果。四、通过在电子显微镜下观察有机硅防水剂外涂与内掺下水泥砂浆内部结构的变化,以及防水功效,通过空白样进行对比,从微观上得出有机硅聚合物水泥砂浆的强度和防水能力优于普通水泥砂浆试样。
[Abstract]:The silicone waterproof treatment of concrete can greatly reduce the harmful medium erosion of concrete in the outside environment. There are two main ways of treatment: first, to brush the surface of concrete structure; second, to apply brush treatment to the surface layer of concrete structure.Silicone is directly mixed into concrete in a certain proportion to improve the quality of the whole concrete, thus increasing its ability to resist the erosion of harmful media.This paper briefly introduces the development of silicone water-repellent at home and abroad, its research significance and waterproof mechanism, and analyzes the effects of silicone coating and admixture through several groups of experiments. The main research contents are as follows: first, through water absorption, waterproofing performance test,It is concluded that the water absorption rate of cement mortar can be greatly reduced by both coating and admixture.The polymer cement mortar has strong hydrophobicity due to the formation of a film on the surface of cement mortar while the internal porosity of the sample decreases because of the change of the structure of the cement mortar specimen with organic silicon polymer.Good hydrophobicity.Secondly, through the test of flexural strength and compressive strength, it is concluded that the flexural strength and compressive strength of the silicone cement mortar coated with silicone mortar is less than that of the standard cement mortar, but the flexural strength of the silicone cement mortar sample is higher than that of the standard cement mortar.The compressive strength decreased slightly, but the degree of decrease was not obvious.Third, through a series of durability tests, such as freezing and thawing test, acid and alkali resistance test, carbonation resistance test, crack resistance test of large plate, etc., the durability of organic silicon modified cement mortar is better than that of unmodified cement mortar.And silicone polymer cement mortar is a little better than the external coating cement mortar in improving the durability to some extent.Fourthly, by observing the change of internal structure of silicone waterproof agent and cement mortar under electron microscope, and by comparing it with blank sample,From the microcosmic point of view, the strength and waterproof ability of silicone polymer cement mortar is better than that of ordinary cement mortar.
【学位授予单位】：武汉轻工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ177.62

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