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Study on Development of Rehabilitation Systems for Reinforced Concrete Slabs

钢筋混凝土板修复系统的开发研究

基本信息

批准号：
10650446
负责人：
KAWAKAMI Makoto
金额：
$ 2.24万
依托单位：
AKITA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650446/
关键词：
Concrete slab Snowy and cold region Durability Exposure test Polymer mortar Setting shrinkage Bonding steel plate Repairing and reinforcement

项目摘要

1) The observation survey of reinforced concrete slabs (RC slabs) in service in the north-east district of Japan corresponding to the typical snow and cold region was performed first. Based on the survey results, the factors of deterioration of RC slabs were classified into the following four group: a) Materials b) Construction c) Structures d) Surrounding Conditions.2) Countermeasures for the deteriorated RC slabs were investigated. The proposed methods are described as follows ; a) Crack injection b) Bonding steel plate c) Bonding carbon fiber sheets d) Installation of additional stringer e) Increasing the deck thickness.Some characteristics of polymer mortars as repair and restoration materials were clarified. Particularly the setting shrinkage stress and deformation of the repaired concrete members due to polymer mortars were main subject of this part.3) Cover depth of RC slabs more than 70 mm and the epoxy polymer coating over the surface of RC slabs were effective to protect the reinforcing bars from severe condition such as salt attack, and freezing and thawing.4) Service life and functions of RC slabs should be always compare and balanced. Life cycle cost is also an important factor at the construction of new concrete structures from the view point of environmental problem. Rehabilitation systems of RC slabs considering above factors and conditions were proposed.5) All results of two years from 1998 to 2000 were summarized and the repot was completed.

1)首先对日本东北地区典型雪寒地区对应的在役钢筋混凝土板（RC板）进行观测调查。根据调查结果，将影响RC板劣化的因素分为以下四类：a)材料b)施工c)结构d)周边条件2)RC板劣化的对策。提出的方法描述如下：a)裂纹注入b)粘合钢板c)粘合碳纤维板d)安装附加筋e)增加甲板厚度。阐述了聚合物砂浆作为修复材料的一些特点。特别是聚合物砂浆对修复混凝土构件的凝结收缩应力和变形是本部分的主要研究内容。3) RC板覆盖深度大于70 mm，表面环氧聚合物涂层可有效保护钢筋免受盐侵蚀、冻融等恶劣工况的影响。4) RC板的使用寿命和功能应经常进行比较和平衡。从环境问题的角度来看，生命周期成本也是新建混凝土结构施工的一个重要因素。考虑上述因素和条件，提出了钢筋混凝土板的修复系统。5)总结了1998 - 2000年两年的全部结果，完成了报告。