混凝土结构防腐蚀衬膜的设计、制备及其性能研究

发布时间：2018-01-13 11:31

本文关键词：混凝土结构防腐蚀衬膜的设计、制备及其性能研究　出处：《武汉理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：纤维增强树脂基复合材料(FRP)因具有强度高、耐腐蚀和疲劳性能好的特点,被广泛应用于混凝土结构的加固和防腐蚀工程。基于FRP材料,从预制构件和有效粘结出发,本文提出了混凝土结构表面衬膜技术,通过在FRP基体材料上集成功能桥接材料制备得到糙化FRP衬膜(roughing FRP sheet,RFS)。与传统的表面涂层和FRP应用技术相比,无需表面处理和胶黏剂即可实现FRP材料与混凝土结构有效地粘结,发挥防腐蚀作用。本文对RFS的粘结性能和耐久性能进行了系统的研究,对RFS的施工装配及修补技术进行了初步的探索。RFS的构造深度和粘结强度随桥接材料粒径的增加而增大,以粒径为3.15~4.75mm的900级轻集料制备的RFS粘结性能最佳,与混凝土表层平均粘结强度达到2.17MPa。RFS与混凝土表层主要由机械啮合和界面结构效应协同粘结,采用多孔结构的桥接材料既减轻了自重,达到轻质化的目的,同时可以与水泥石及FRP互穿啮合。当桥接材料和混凝土强度等级一定时,RFS与混凝土表层粘结强度与桥接材料粒径、集成密度、容积率等参数有关,平均粘结失效力可表述为F=K1hsp+K2D50+K3。采用硅烷偶联剂(Silane coupling agent,SCA)作为界面剂来增强RFS与混凝土之间的粘结质量。结果表明,SCA可调控轻集料吸水率,适宜浓度的SCA可优化界面区组成和结构,提高粘结强度、机械强度及界面区显微硬度。本文中,当SCA溶液浓度为0.05%时,体系性能提升最为明显。本文评价了RFS-混凝土体系在氯离子侵蚀、温度冲击、海水干湿循环、紫外老化及荷载冲击等环境作用下的耐久性能。结果表明,RFS的抗氯离子渗透性能优异;在90次温度冲击、海水干湿循环后,RFS外观无明显变化,粘结强度降低了79.3%和54.8%;经过2000h的紫外光照老化后,RFS外观颜色逐渐加深变黄,粘结强度降低了59.6%;SCA改善不同环境作用对RFS-混凝土体系耐久性影响的效果表现差异,对温度冲击作用基本无改善效果,对海水干湿循环作用改善较为明显。采用浓度为0.05%的SCA溶液处理试样,经过90次温度冲击和海水干湿循环作用后粘结强度分别降低了80.4%和34.0%;对于采取丙烯酸树脂涂层的试样,经2000h的紫外光照老化后粘结强度仅降低了28.5%,表明表面涂层可显著提高RFS-混凝土体系的抗紫外光耐久性能。荷载冲击结果表明只有当内部混凝土被冲击溃散破裂时,才会出现RFS与混凝土剥离的情况,而局部破损时,RFS并不会从混凝土表面剥落。通过实验室条件下的模拟试验,本文提出的施工总体技术思路是将RFS固定在混凝土模板内侧,通过浇铸使其与混凝土粘结成为一个整体,当外模板拆卸后,即完成RFS的装配施工。当RFS破损后,可采取涂刷树脂浆液的方式进行有效的修补。
[Abstract]:Fiber reinforced resin matrix composites (FRP) because of its high strength, corrosion and fatigue performance, is widely used in reinforced concrete structure and corrosion engineering. Based on the FRP material, starting from prefabricated and effective bond, is proposed in this paper. The concrete structure surface lining membrane technology, through the FRP matrix materials. The integrated function of bridging material was prepared by roughening FRP (roughing FRP sheet, lining film RFS). Compared with the traditional surface coating and FRP application technology, FRP materials and concrete structure effectively bonded without surface treatment and adhesive can play anti corrosion effect. Based on RFS's performance and durability of bonding system research, construction assembly and repair technology of RFS conducted a preliminary exploration of.RFS structure depth and bond strength with the increase of particle size of bridging material increases, the particle size of 3.15 ~4.75mm 900 The best bond performance lightweight aggregate prepared by RFS, and the average bond strength of concrete surface and the concrete surface to 2.17MPa.RFS mainly by mechanical engagement and interface structure of the synergistic effect of bonding, the bridging material with porous structure can reduce the weight, achieve the purpose of light, with cement and FRP interpenetrating mesh at the same time. When the bridge materials and concrete strength grade is RFS and the concrete surface bonding strength and bridging material particle size, integrated density, relevant parameters such as volume rate, average bond failure force can be expressed as F=K1hsp+K2D50+K3. using silane coupling agent (Silane coupling, agent, SCA) as the interface agent to enhance the bonding quality between RFS and concrete. The results show that SCA, adjustable light aggregate water absorption rate, the suitable concentration of SCA can optimize the interface composition and structure, improve the bonding strength, mechanical strength and hardness. The interfacial zone, When the SCA concentration is 0.05%, the system performance is most obvious. This paper evaluates the RFS- system in the chloride ion erosion of concrete, temperature shock, seawater wet dry cycling, durability and load effect of ultraviolet aging impact under the environment of RFS. The results showed that the resistance to penetration of chloride ions in the 90 excellent; temperature shock and the seawater wet dry cycles, the appearance of the RFS had no obvious change, the bond strength decreased by 79.3% and 54.8%; after 2000h UV aging, RFS color gradually become yellow, the bond strength decreased by 59.6%; improve the environment with different SCA effects on RFS- system of concrete durability performance difference, basically no effect the impact of seawater temperature, wet and dry cycle had obvious improvement. The concentration of 0.05% SCA solution samples, after 90 times of thermal shock and seawater wet dry cycle after bond strength respectively. Decreased by 80.4% and 34%; to take samples of acrylic resin coating, the 2000h ultraviolet aging after bond strength decreased only 28.5%, showed that the surface coating can effectively improve the durability of anti UV RFS- concrete system. The results show that only when the impact load inside the concrete impact of collapsibility rupture, RFS occurs with concrete stripping the situation, while the local damage, RFS is not from the surface spalling of concrete. Through laboratory simulation test, the overall idea of construction technology is proposed in this paper is RFS fixed on the concrete template by casting, making it a whole and concrete bond, when the template is removed, to complete the assembly and construction of RFS. When the RFS is damaged, can take the coating resin grout way effective repair.

【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU37;TU599

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