INTRODUCTION TO THE LOHAS BRIDGE PROJECT AIMING AT THE REALIZATION OF HEALTHY AND SUSTAINABLE BRIDGES
In Japan, there is significant rapid aging of the concrete deck slabs of road bridges in snowy cold regions due to the large-scale use of de-icing agent (NaCl).When de-icing agent is sprinkled, salt damage, frost damage, and alkali-silica reaction (ASR) of concrete deck slabs are promoted, and horizontal cracking and aggregation occurs within deck slabs due to fatigue under the action of water.As countermeasures against these deteriorations, it is considered important to reduce the water binder ratio while ensuring that there is sufficient entrained air, and by using fly ash or ground granulated blast furnace slag, the ingress of chlorides from the top surface of the deck slab can be reduced.Also, it is expected that the problems on site are caused by cracking such as shrinkage cracking, etc., due to the constraint by steel main girders.To solve these problems, it is necessary to develop high durability concrete deck slabs satisfying the required performance, by producing full size models that reproduce the situation on site, and to evaluate the constructability, the expansion/shrinkage behavior under the actual environment, and to evaluate the long-term durability performance.In this research, a project has been initiated to reproduce full size concrete deck slabs on steel main girders within the campus of college.Design (materials, mix) and construction measures were carried out, and the performance was evaluated at each stage, to develop slabs that satisfy the required performance, and that can be realized on site.This project is called the LOHAS Bridge Project, and has the aim of realizing healthy and sustainable bridges.In this paper, an outline of the project is presented, and the application of the measurement results, durability test results, and research results to an example on site are presented.
LOHAS bridge de-icing agent durability combined deterioration Multiple protection
Ichiro Iwaki
Department of Civil Engineering, College of Engineering, Nihon University, Japan
国际会议
西安
英文
2-9
2017-09-11（万方平台首次上网日期，不代表论文的发表时间）