Bond Strength of Deformed Bars in Polymer-Modified Lightweight Aggregate Concrete

摘要

The recycling of industrial waste such as the bottom ash from furnaces is anrnimportant issue in the construction industry since it enables the reduction ofrnconstruction costs and the creation of beneficial effects on the environment. In thisrnstudy, the bond characteristics of steel deformed bars embedded in artificialrnlightweight aggregate concrete with SBR-Latex which is manufactured with bottomrnash were investigated. This study focuses on the bond strength of deformed barsrnembedded with polymer-modified lightweight aggregate concrete with SBR-Latex.rnA pullout test was performed on sixty cubic specimens to measure the bond strength.rnThe compressive strength of the concrete and the embedment length werernconsidered as variables in this study. The bond stress-slip responses and modes ofrnfailure were identified during the test. The results of the test indicated that averagernbond stress was decreased as the embedded length was increased while therncompressive strength of concrete decreased. This reduction is not proportional to thernincrease in embedment length while the bond strength increases as the compressivernstrength of concrete increases. The test data was also compared with the predictionsrnusing the ACI 408(2003), Orangun’s equation [1]. The comparison shows that thernexisting bond strength equations cannot be directly applied to the design ofrnlightweight concrete with SBR-Latex.