Title:
Effects of Compressive Strength, Autogenous Shrinkage and Testing Methods on the Bond Behavior of HES-ECC
Author(s):
G. Yildirim, M. S¸ ahmaran, M. K. M. Al-Emam, R. K. H. Hameed, Y. Al-Najjar, and M. Lachemi
Publication:
Materials Journal
Volume:
112
Issue:
3
Appears on pages(s):
409-418
Keywords:
autogenous shrinkage; bond strength; direct pulloff test; engineered cementitious composites (ECC); high early strength; slant shear test.
DOI:
10.14359/51687188
Date:
5/1/2015
Abstract:
An experimental study was undertaken to assess the bond characteristics of high-early-strength engineered cementitious composites (HES-ECC) with characteristics of high ductility and low early-age shrinkage. For comparison purposes, a mixture of repair material (REP), which is commercially available and extensively used for fast and durable repair of infrastructures, was used to compare the bonding performance. For the evaluation of bond characteristics, slant shear and tensile pulloff tests were performed. In this study, the influence of compressive strength and autogenous shrinkage on individual bond strength results is also discussed, along with the basic mechanical properties of the proposed materials. Experimental results indicate that the influence of compressive strength
and autogenous shrinkage on bond strength results varies significantly depending on the test method. It was also shown that the use of HES-ECC mixtures significantly improves the bond characteristics of a repair assembly in comparison to REP. Enhanced bond performance of HES-ECC mixtures over REP is more evident in the case of direct pulloff tests than in slant shear tests, both in terms of bond strength results and failure type.
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