Comparative Study On Bond Behavior Of Structural Concrete Made Of Scoria Aggregates

Scoria aggregate is one of the most widely found natural lightweight materials in Ethiopia. Thisrnresearch compares the bond behavior of reinforced concrete, produced by scoria aggregates withrnnormal-weight aggregate concrete. In this study, pull-out tests were performed on cubicrn(150x150x150mm) and cylindrical (150x300mm) specimens, with embedded reinforcing barsrn(diameter 14mm, 16mm, and 20mm). Three concrete mix types were studied having; scoriarncoarse and fine aggregate (Sc-Sc), scoria coarse aggregate and natural sand (Sc-Sa), and naturalrnsand fine aggregate and crushed stone/gravel coarse aggregate (N). The results of the experimentrnshowed that scoria aggregate concrete has reasonably less bond strength as compared to normalweightrnrnconcrete. Moreover, the design bond strengths of the three concrete mixes used in thernexperiment were calculated using the provisions given by the two codes, Euro code-2 and ACI318.rnThenrncomparisonrnwasrndonernbetweenrnthernresultsrnofrntherntworncodesrnandrnthatrnofrnthernexperiment.rnrnConsequently,rnrnthe reduction in bond strength of scoria aggregate concrete obtained from thernexperiment was found to be lower than the results of the two codes. This signifies that equationsrngiven by both the ACI and Euro code are in safe range to be used for calculating the design bondrnstrength and anchorage length of scoria aggregate concrete.

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