梯度结构混凝土构件的设计、制备与性能评价  

Design,Preparation and Property Evaluation of Gradient Structure Concrete Members

作　　者：温小栋[1] 赵莉[2] 董博[1] 

机构地区：[1]云南民族大学电气信息工程学院,云南昆明650031 [2]宁波工程学院建筑与交通工程学院,浙江宁波315016

出　　处：《公路交通科技》2017年第7期53-59,共7页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51569035);浙江省自然科学基金项目(LY15E080014);浙江省本科院校中青年学科带头人学术攀登项目(pd2013426)

摘　　要：为了提高恶劣环境下混凝土结构耐久性,基于功能梯度材料理念,利用无细观界面过渡区水泥基材料的高抗裂自修复、低离子传输能力,对混凝土构件进行梯度复合结构设计,主动增强保护层。考虑构件体型、内外层材料差异及现场施工,研究梯度结构混凝土构件制备方法,并对1∶5缩尺构件及足尺构件进行性能试验。结果表明:GSCM不会发生体积变形不一致性破坏;与传统的单层混凝土构件相比,GSCM表层的强度提高幅度为30%;GSCM面层仅存在少量宽度在0.02~0.05 mm之间不可见裂纹,而传统的单层构件存在宽度在0.2~0.5 mm的可见裂纹;GSCM渗透深度与氯离子扩散系数分别为0 mm和6.3×10^(-13)m^2/s,而传统的单层构件为15 mm和12.8×10^(-13)m^2/s;三环拼装性能良好,满足工程要求。For enhancement the durability of concrete structure under severe environment, based on the concept of functionally graded materials, the design of graded composite structures is performed for concrete components by using meso-defect interfacial transition zone-free cement-based material as the active enhanced protective layer due to its excellent anti-crack, self-healing and low ion transport properties. Moreover, the preparation method for the gradient structure concrete member （GSCM） is studied considering about the structure style, materials variance of inner and outer layers, and site operation. What is more, the experiments of 1：5 scale and full scale specimens are carried out. The result shows that （1） the non-uniform deformation does not occur in GSCM; （2） the surface-layer strength of the GSCM improved by 30% compared to that of traditional single-layer concrete member; （3） a few invisible tiny cracks exists in the surface layer of GSCM, and the width of these cracks range from 0. 02 mm to 0. 05 mm, whereas the traditional single-layer concrete member are distributed with visible cracks whose width ranges from 0. 2 mm to 0. 5 mm; （4） the permeating depth and chlorine ion diffusion coefficient of the GSCM are 0 mm and 6. 3×10^-13m^2/s respectively, while a conventional single-layer component is 15 mm and 12. 8 ×10^-13m^2/s.

关 键 词：桥梁工程 梯度结构设计 数值模拟 性能分析 混凝土构件 恶劣环境 

分 类 号：U449.7[建筑科学—桥梁与隧道工程]