Behavior of Epoxy Bonded Bars in Concrete Affected by Alkali-Silica Reaction

被引：4
|
作者：
Villemure, Felix-Antoine [1 ,2 ]
Fiset, Mathieu [3 ]
Bastien, Josee [4 ]
Mitchell, Denis [5 ]
Fournier, Benoit [6 ]
机构：
[1] Univ Laval, Dept Civil Engn, Quebec City, PQ, Canada
[2] WSP Canada, Quebec City, PQ, Canada
[3] Univ Quebec Chicoutimi, Dept Appl Sci, Saguenay, PQ, Canada
[4] Univ Laval, Dept Civil & Water Engn, Quebec City, PQ, Canada
[5] McGill Univ, Dept Civil Engn & Appl Mech, Montreal, PQ, Canada
[6] Univ Laval, Dept Geol & Geol Engn, Quebec City, PQ, Canada
来源：
ACI MATERIALS JOURNAL | 2019年 / 116卷 / 06期
基金：
加拿大自然科学与工程研究理事会;
关键词：
alkali-silica reaction (ASR); bond; post-installed reinforcing bar; pullout test; DAMAGE TEST SDT; ASR; STRENGTH; ELEMENTS;
D O I：
10.14359/51719069
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Installation of drilled-in epoxy-bonded reinforcing bars is generally an effective strengthening method to increase the flexural and shear capacities of deficient concrete structures. However, most of the available studies characterizing the bond behavior of epoxy bonded bars in concrete have been carried out on sound concrete elements-that is, without any pathological material damage. This raises the question of bond capacities in existing damaged elements. This study investigates the influence of alkali-silica reaction (ASR) on the capacity of post-installed reinforcing bars. ASR is a deleterious mechanism that causes expansion and cracking in the affected concrete elements. Pullout tests on post-installed reinforcing bars having embedded lengths of 2d(b), 4d(b), and 5d(b) with 15M reinforcing bars (d(b) = 15.9 mm [0.626 in.]) have demonstrated a drop-in bond strength when concrete is affected by ASR. In addition, the study revealed that the progression of concrete expansion due to ASR may lead to some confinement of the post-installed reinforcing bar and possibly increases the bond strength.
引用
收藏
页码：179 / 191
页数：13
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