水泥基材料的自愈合及與BFRP筋復(fù)合結(jié)構(gòu)的力學(xué)性能研究
[Abstract]:Concrete cracking can lead to a series of durability problems, but the conventional crack repair method is time-consuming and laborious, but it can not achieve good results. Therefore, fiber reinforced cement matrix composites with crack limiting ability and stainless high strength FRP bars can be used as good substitute materials for reinforced concrete. In addition, cement matrix composites also have a certain ability of self-healing of cracks. Because the two materials complement each other, they are expected to improve the cracking and corrosion of traditional reinforced concrete structures. In order to study the tensile properties and self-healing ability of fiber reinforced cement matrix composites and the mechanical properties of composite structures of cement matrix composites and BFRP tendons, related experiments were carried out in this paper. The effects of mineral admixtures on the tensile properties of cement matrix composites and the self-healing properties of composites based on impermeability, strength recovery and crack change were evaluated. The mechanical properties of composite-BFRP composite beams and the effect of crack self-healing on the mechanical properties of composite beams are also discussed. It is found that slag can enhance the structure density and permeability resistance of cement-based composites at 28 days of age, and the composites with fly ash, metakaolin, silica fume and slag have 2% fiber volume. The ultimate tensile strength and ultimate strain can reach 3.86 MPa and 2.2, and the crack width of the material can be well limited by the development of multiple cracks during tension, and the excellent self-healing ability of crack is shown under the condition of dry-wet cycle curing, the tensile strength and the ultimate strain can reach 3.86 MPa and 2.2, respectively. The strength of cracking material after dry and wet cycle curing for 28 days can reach 1177.The dry and wet cycle is the best curing condition for composite material self-healing considering the effect of self-healing and practical operation. The initial crack width plays a leading role in fracture self-healing. Cracks less than 50 渭 m can basically heal, while those larger than 150 渭 m have no obvious healing effect. When the composite material is used to replace the tensile zone of 70 mm concrete beam and the normal carbon steel is replaced by the FRP bar, the flexural capacity of the beam is increased by about 10% compared with that of the BFRP bar, and the overall stiffness of the beam is obviously increased. The deflection of the composite beam decreases obviously when it is destroyed and the composite beam is preloaded and subjected to dry and wet cycle curing for 28 days the overall stiffness of the beam recovers obviously and the micro-crack healing effect is better.
【學(xué)位授予單位】:浙江大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TU528
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