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Title |
Influence of Material Factors on Estimation of Compressive Strength of Concrete by P Type Schmidt Rammer
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Keywords |
P형 슈미트해머; 압축강도 추정; 재료요인; 시멘트 종류; 혼화재 치환율; P type schmidt hammer; estimation of compressive strength; material factor; kinds of cement; replacing ratio of mineral admixture |
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Abstract |
The present paper is intended to investigate the influence of materials such as cement, mineral admixture and aggregate, on the estimation of compressive strength by P type schmidt hammer. According to the results, the materials of concrete, such as the types of cement, the replacing ratio of mineral admixture, the kinds and maximum size of aggregate, hardly influence on non-destructive test by P type schmidt hammer except for alumina cement, hence, P type schmidt can be applicable to most of the concrete with a wide range. Since the correlativity between the rebound value of P type schmidt hammer and compressive strength is very favorable(above coefficient of correlation 0.96) regardless of materials, it is considered that compressive strength can be estimated comparatively exactly by P type schmidt hammer. The estimating formula of compressive strength by rebound value are derived from this experiment as following. Horizontal strike : Fc = 0.765RH - 5.74 (R=0.965) Vertical strike Fc = 0.793RV - 8.66 (R=0.959)
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