梯度结构混凝土构件的设计、制备与性能评价
发布时间：2018-08-25 18:49
【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。
[Abstract]:In order to improve the durability of concrete structures under harsh environment, based on the concept of functionally graded materials, the gradient composite structure of concrete members is designed by using the high crack resistance self-repairing and low ion transport ability of cement based materials in the transition zone without meso interface. Active enhancement of protective layer. Considering the shape of components, material difference between inner and outer layers and site construction, the preparation method of gradient structure concrete members was studied, and the performance tests of 1:5 shrinkage and full scale members were carried out. The results show that the volume deformation inconsistency failure will not occur in the WGSCM, and the strength of the surface layer of the GSCM is increased by 30% than that of the conventional monolayer concrete members. There are only a few cracks in the surface layer whose width is between 0.02 and 0. 05 mm, and only a few cracks can not be seen in the surface layer of the GSCM. The conventional monolayer members have a penetration depth and a chloride diffusion coefficient of 0 mm and 6. 3 脳 10 ~ (-13) m ~ (-2 / s), respectively, with a width of 0. 2 ~ 0. 5 mm, while the traditional monolayer members are 15 mm and 12. 8 脳 10 ~ (-13) m ~ (2 / s) respectively, and the three-ring assembly has good performance to meet the engineering requirements.
【作者单位】： 云南民族大学电气信息工程学院;宁波工程学院建筑与交通工程学院;
【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)
【分类号】：U442.5
[Abstract]:In order to improve the durability of concrete structures under harsh environment, based on the concept of functionally graded materials, the gradient composite structure of concrete members is designed by using the high crack resistance self-repairing and low ion transport ability of cement based materials in the transition zone without meso interface. Active enhancement of protective layer. Considering the shape of components, material difference between inner and outer layers and site construction, the preparation method of gradient structure concrete members was studied, and the performance tests of 1:5 shrinkage and full scale members were carried out. The results show that the volume deformation inconsistency failure will not occur in the WGSCM, and the strength of the surface layer of the GSCM is increased by 30% than that of the conventional monolayer concrete members. There are only a few cracks in the surface layer whose width is between 0.02 and 0. 05 mm, and only a few cracks can not be seen in the surface layer of the GSCM. The conventional monolayer members have a penetration depth and a chloride diffusion coefficient of 0 mm and 6. 3 脳 10 ~ (-13) m ~ (-2 / s), respectively, with a width of 0. 2 ~ 0. 5 mm, while the traditional monolayer members are 15 mm and 12. 8 脳 10 ~ (-13) m ~ (2 / s) respectively, and the three-ring assembly has good performance to meet the engineering requirements.
【作者单位】： 云南民族大学电气信息工程学院;宁波工程学院建筑与交通工程学院;
【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)
【分类号】：U442.5
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