柔性水泥基薄层修补材料的研究
发布时间：2019-01-26 12:44
【摘要】：近年来,随着各类建筑结构的破损、劣化逐步增多,建筑修补材料得到迅速发展,尤其是性能优异的聚合物水泥基修补材料,成为国内外研究的热点。柔性水泥基薄层修补材料是指由聚合物乳液与水泥为主要原料,辅以填料、助剂等其它组分所制成的厚度为2mm左右的具有一定结构强度和柔韧性的材料。本文采用不同种类的聚合物乳液、水泥、填料等原材料组分,通过研究单一组分中不同种类原材料对修补材料各项性能的影响,参照原有的聚合物水泥基修补材料的性能指标,提出了该材料的工作性能、界面性能、耐久性能建议性能指标。并对聚合物水泥基类修补材料的形成过程、结构形成机理、微观结构模型等进行了探究,并得到了如下结论:(1)聚灰比对涂料的工作性影响明显,对丙烯酸酯乳液水泥基材料,材料的拉伸性能随聚灰比的增大而增大,其中聚灰比在0.6时增大效果突变。EVA乳液的拉伸性能随聚灰比的增大有所下降,只有聚灰比小于0.4时,有增大的趋势。三种乳液的断裂延伸率都是随聚灰比的增大而变大,苯丙乳液制成的涂料力学性能最好,纯丙乳液的其次,EVA乳液的最差。(2)普通硅酸盐水泥涂料的流动度比硫铝酸盐水泥的流动度大,表干时间和实干时间都更长,普硅水泥涂料的界面性能都比硫铝酸盐水泥涂料的好,且耐久性能优异。(3)石英砂作为填料在单掺时,当石英砂粒径∮≤400时,涂料拉伸强度最低,∮≥600时,其次,而石英砂粒径400≤∮≤600时最大。但是无论哪种石英砂单掺时,其涂料的强度都比用混合砂制作的涂料强度小,而且拉伸强度降低显著,可见填料太细或者太粗均不利于涂料的性能。(4)纤维的加入可以显著改善材料的界面性能和低温柔性,其中使用玄武岩纤维的材料性能最优,碳纤维其次,聚丙烯纤维的最次。以上研究结论为柔性水泥基薄层修补材料的研制奠定了基础,最终研发出的柔性水泥基薄层修补材料Ⅰ型产品具有以下特点:一是与基层粘结性能好,防水性能优异;二是对基层的微裂缝追随性强,涂层柔韧性好;三是操作简单,便于施工。
[Abstract]:In recent years, with the damage and deterioration of various kinds of building structures, the building repair materials have been developed rapidly, especially the polymer cement based repair materials with excellent performance, which has become a hot research topic at home and abroad. Flexible cement-based thin-layer repair material is a kind of material with certain structural strength and flexibility, which is made of polymer emulsion and cement as main raw material, supplemented by filler, auxiliary and other components, whose thickness is about 2mm. In this paper, different kinds of polymer emulsion, cement, fillers and other raw materials are used to study the effects of different kinds of raw materials in a single component on the properties of the repair materials, referring to the performance indexes of the original polymer cement based repair materials. The working performance, interface performance and durability of the material are suggested. The formation process, structure formation mechanism and microstructure model of polymer cement based repair materials are also studied. The conclusions are as follows: (1) the influence of polymer cement ratio on the workability of coatings is obvious. For acrylic emulsion cement based materials, the tensile properties of the composites increase with the increase of the ratio of polymer to cement, and when the ratio of polymer to cement increases at 0.6, the tensile properties of the EVA emulsion decrease with the increase of the ratio of polymer to cement. Only when the ratio of aggregate to cement is less than 0.4, there is an increasing trend. The elongation at break of the three kinds of emulsions increased with the increase of the ratio of polymer to cement. The mechanical properties of the coatings prepared by the styrene-acrylic emulsion were the best, followed by the pure acrylic emulsion. EVA emulsion is the worst. (2) the fluidity of ordinary Portland cement coating is larger than that of sulphoaluminate cement, the surface drying time and dry time are longer, and the interfacial performance of common silicate cement coating is better than that of sulphoaluminate cement coating. And excellent durability. (3) when quartz sand is used as filler, when quartz sand particle size is 鈮，
本文编号：2415500
[Abstract]:In recent years, with the damage and deterioration of various kinds of building structures, the building repair materials have been developed rapidly, especially the polymer cement based repair materials with excellent performance, which has become a hot research topic at home and abroad. Flexible cement-based thin-layer repair material is a kind of material with certain structural strength and flexibility, which is made of polymer emulsion and cement as main raw material, supplemented by filler, auxiliary and other components, whose thickness is about 2mm. In this paper, different kinds of polymer emulsion, cement, fillers and other raw materials are used to study the effects of different kinds of raw materials in a single component on the properties of the repair materials, referring to the performance indexes of the original polymer cement based repair materials. The working performance, interface performance and durability of the material are suggested. The formation process, structure formation mechanism and microstructure model of polymer cement based repair materials are also studied. The conclusions are as follows: (1) the influence of polymer cement ratio on the workability of coatings is obvious. For acrylic emulsion cement based materials, the tensile properties of the composites increase with the increase of the ratio of polymer to cement, and when the ratio of polymer to cement increases at 0.6, the tensile properties of the EVA emulsion decrease with the increase of the ratio of polymer to cement. Only when the ratio of aggregate to cement is less than 0.4, there is an increasing trend. The elongation at break of the three kinds of emulsions increased with the increase of the ratio of polymer to cement. The mechanical properties of the coatings prepared by the styrene-acrylic emulsion were the best, followed by the pure acrylic emulsion. EVA emulsion is the worst. (2) the fluidity of ordinary Portland cement coating is larger than that of sulphoaluminate cement, the surface drying time and dry time are longer, and the interfacial performance of common silicate cement coating is better than that of sulphoaluminate cement coating. And excellent durability. (3) when quartz sand is used as filler, when quartz sand particle size is 鈮，
本文编号：2415500
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