有机硅防水剂对泡沫混凝土的影响研究

发布时间：2018-06-21 13:28

本文选题：泡沫混凝土 + 甲基硅酸盐有机硅　；参考：《重庆大学》2015年硕士论文

【摘要】：泡沫混凝土一般是指用机械方法把泡沫剂制备成泡沫,再将泡沫与含硅质材料、钙质材料、水和各种外加剂等组成的料浆混合、搅拌、浇注成型、养护的一种多孔材料,目前被广泛应用于建筑领域。但是,泡沫混凝土在加入泡沫的同时,引入了大量气泡,导致实际应用出现问题,比如抗压强度低、吸水率高等,这些问题严重限制了泡沫混凝土的应用。另外,随着粉煤灰和矿渣的排放量逐渐增加,环境压力越来越大,因此将粉煤灰和矿渣掺入泡沫混凝土,对于节能减排,节约资源有着十分重要的意义。所以,怎样提高掺入了粉煤灰和矿渣的泡沫混凝土的强度,降低吸水率,对扩宽其应用领域显得尤其重要。本文旨在研究乳液型有机硅、甲基硅酸盐有机硅对泡沫混凝土的吸水率、抗压强度的影响。我们在纯水泥泡沫混凝土、掺加了粉煤灰的泡沫混凝土、掺加了矿渣的泡沫混凝土表面刷涂乳液型有机硅,在纯水泥泡沫混凝土表面刷涂甲基硅酸盐有机硅防水剂之后,观察这两种有机硅对泡沫混凝土性能的影响。我们查阅了大量有关泡沫混凝土防水性能、乳液型有机硅及甲基硅酸盐有机硅防水剂的防水机理的文献,结合已有的研究成果,改变有机硅浓度及掺量,以找到能有效降低泡沫混凝土吸水率、提高抗压强度的有机硅。研究结果表明:在试块表面刷涂乳液型有机硅后,纯水泥泡沫混凝土、粉煤灰泡沫混凝土、矿渣泡沫混凝土与未刷涂乳液型有机硅相比较,抗压强度有所提高,吸水率降低明显,且与乳液型有机硅的浓度有关,而与乳液型有机硅的刷涂质量没有直接相关关系。在纯水泥泡沫混凝土表面刷涂甲基硅酸盐有机硅防水剂能提高纯水泥泡沫混凝土强度,降低吸水率。
[Abstract]:Foam concrete generally refers to a porous material that is prepared into foam by mechanical method and then mixed, stirred, molded, and preserved with a mixture of silica, calcium, water and various admixtures. At present, it is widely used in the field of architecture. However, when foam concrete is added, a large number of bubbles are introduced, which leads to problems in practical application, such as low compressive strength and high water absorption. These problems seriously limit the application of foam concrete. In addition, with the increase of the discharge of fly ash and slag, the environmental pressure is increasing. Therefore, it is very important to add fly ash and slag into foamed concrete for energy saving and resource saving. Therefore, how to improve the strength of foamed concrete mixed with fly ash and slag and reduce the water absorption is especially important to widen its application field. In this paper, the effects of emulsion silicone and methyl silicate organosilicon on water absorption and compressive strength of foam concrete are studied. We brush the surface of pure cement foam concrete with fly ash, with slag, with emulsion silicone on the surface of pure cement foam concrete, after the surface of pure cement foam concrete is brushed with methyl silicate silicone water-repellent. The effects of these two organosilicon on the properties of foamed concrete were observed. We have consulted a large number of literatures on the waterproof properties of foam concrete, the waterproof mechanism of emulsion silicone and methyl silicate silicone waterproof agents, and combined with the existing research results, to change the concentration and content of organosilicon. In order to find the silicone which can effectively reduce the water absorption of foam concrete and improve the compressive strength. The results show that the compressive strength of pure cement foam concrete, fly ash foam concrete and slag foam concrete is improved compared with that of non-brush emulsion silicone. The water absorption decreased obviously and was related to the concentration of emulsion silicone, but not to the quality of brush coating of emulsion silicone. The strength of pure cement foam concrete can be improved and the water absorption rate can be reduced by brushing methyl silicate organic silicon waterproof agent on the surface of pure cement foam concrete.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528

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