Water distribution in beams damaged by Alkali-Silica Reaction: global weighing and local gammadensitometry

Title: Water distribution in beams damaged by Alkali-Silica Reaction: global weighing and local gammadensitometry
Author(s): S. Multon, E. Merliot, M. Joly, F. Toutlemonde
Paper category : journal
Serial title: Materials and Structures
Abreviated Serial title: Mater. Struct.
ISSN: 1359-5997
Publisher: RILEM Publications SARL
Volume: 37
Issue: 269
Issue date: 2004-06-01
Publication year: 2004
Pages: 282 - 288
Total Pages: 7
Nb references: 20
Language: English

Abstract: Concrete repair works involve most of the time the removal of the damaged or contaminated surface layer.
It is necessary to assess the effect of that operation (tool, procedure, etc.
) upon the integrity of the residual concrete substrate, prior to the placement of the repair material, since it can affect significantly the adhesion of the repair system.
This paper summarizes the findings of a study intended to develop a simple test method for that purpose.
After a thorough review of the related scientific documentation, it has been decided to adapt the so-called pull-off test, which is commonly used to determine the bond strength of repair products.
An experimental program has been conducted to evaluate the influence of various test parameters on the measured cohesion of a reference concrete surface: transfer plate thickness and diameter, core drilling depth, speed of loading, adhesive type and thickness, and number of tests.
A multivaried statistical analysis of the test results clearly shows that the plate diameter and core depth are the most significant parameters, presumably with threshold values, and that there exists a synergetic effect between them.
Also, a minimum number of tests can be defined based on the standard deviation and required level of confidence of the results.
Overall, the test method shows good potential for a sound quantitative evaluation of a concrete surface mechanical integrity prior to repair, provided that the test parameters are selected properly.

Online publication: 2004-04-27
Classification: Scientific Reports
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/13945