Compressive strength of micropile-to-grout connections

被引：21
|
作者：
Veludo, J. [2 ]
Julio, E. N. B. S. [1 ]
Dias-da-Costa, D. [3 ]
机构：
[1] Univ Tecn Lisbon, Dept Civil Engn, ICIST, Inst Super Tecn, Lisbon, Portugal
[2] Polytech Inst Leiria, Dept Civil Engn, ICIST, P-2411901 Alto Do Vieiro, Leiria, Portugal
[3] Univ Coimbra, Dept Civil Engn, INESCC, Coimbra, Portugal
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2012年 / 26卷 / 01期
关键词：
Bond; Strength; Confinement; Retrofitting; Interface; Micropile; Grout; Push-off tests; REINFORCING BARS; BOND STRENGTH; CABLE BOLTS; CONFINEMENT;
D O I：
10.1016/j.conbuildmat.2011.06.007
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Strengthening foundations with micropiles is progressively being used, due to the major advantages that this technique presents. Nevertheless, the influence of some relevant parameters in the overall behavior of the retrofitted foundations has not yet been studied. Generally, micropiles are installed in holes drilled through the existing RC footing, which are then filled with grout. The efficiency of the load transfer mechanism depends on the bond strength of both the micropile-grout and the concrete-grout interfaces. This paper describes an experimental study performed to specifically study the influence of the following parameters on the bond strength between micropile-grout interface: hole diameter: embedment length of the micropile; and level of confinement of the grout mass. Thirty micropile-grout specimens were submitted to monotonic push-off tests, until failure. Bond strength was found to increase with a decrease of the hole diameter and with an increase of the confinement level. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：172 / 179
页数：8
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