Research Of Flexible Cement Base Thin Layer Repairing Material

In recent years, due to damage and deterioration of various types of building structures gradually increased, making the building repair materials developed rapidly, especially the excellent performance of polymer cement-based repair materials, it has become a research hotspot.Flexible cement-based patching material is defined by a thin layer of polymer emulsion and cement as the main raw material, thickness combined with other ingredients fillers, additives made from about 2mm of material has a certain structural strength and flexibility. In this paper, different types of polymer emulsion, cement, fillers and other raw materials component, through influence of the individual components of different kinds of raw materials to repair the property, referring to the original performance polymer cement repair material is proposed the performance, the interfacial properties of the material, durability performance is recommended. And the formation of polymer cement based patching material type, structure formation mechanism, microstructure models has been explored, and get the following conclusions:(1) Poly-cement ratio to affect performance significantly repair materials, acrylic emulsion for cement-based materials, the tensile properties of the material with increasing polymer- cement ratio increases, which increases the effect of poly-cement ratio of 0.6 mutations. Tensile properties of EVA emulsion polymerization with increasing cement ratio has declined only poly-cement ratio is less than 0.4, there is an increasing trend. Elongation at break is over three emulsion polymer- cement ratio increases and becomes larger, the mechanical properties of the material is preferably made of styrene-acrylic emulsion, acrylic emulsion secondly, the worst EVA emulsion.(2) Flow of the material made with ordinary Portland cement fluidity than sulfur aluminate cement materials made large, and dry time and have a longer drying time, good interface properties, and excellent durability.(3) Quartz sand as filler added separately, when quartz sand particle size ??400, the minimum tensile strength of the coating, ??600, the second, and quartz sand particle size 400???600 maximum. However, when added separately Either quartz sand, its intensity than the mixed sand intensity, and the tensile strength decreased significantly, showing that the filler is too thin or too thick are not conducive to coating performance.(4) Fiber can significantly improve the interfacial properties of the material and low temperature flexibility, in which optimum material properties of basalt fiber, carbon fiber Secondly, polypropylene fibers most times.The above findings for the development of a flexible thin layer of cement-based repair materials laid the foundation, and ultimately developed a flexible thin layer of cement-based repair materials ?type product has the following characteristics: First, with the primary bond performance, excellent waterproof performance; the second is microfractures of strong grassroots following, coating flexibility is good; the third is a simple operation, ease of construction.