이형 콘크리트 블록의 강도 평가방법에 관한 연구

Abstract

PURPOSES: This study aims to develop a strength test method for irregularly shaped concrete block paver. METHODS : Ten (10) different types of concrete block pavers including porous and dense blocks were tested for strength capacities. Destructive and non-destructive methods were used to develop a strength test method for irregularly shaped concrete block paver. The flexuralstrength evaluation was conducted in accordance to KS F 4419, while compressive strength was conducted with a 45.7mm-diameter corespecimen. The impact echo test method was used to evaluate the elastic modulus. Finally, regression analysis was used to investigate therelationship between flexural strength, compressive strength and elastic modulus based on their corresponding test results. RESULTS : The flexural strength of the tested block pavers ranged from 4MPa to 10MPa. At 95% confidence level, the coefficients ofdetermination between compressive-flexural strength relationship and compressive strength-elastic modulus relationship were 0.94 and 0.84,respectively. These coefficients signified high correlation. CONCLUSIONS : Using the test method proposed in this study, it will be easier to evaluate the strength of irregularly shaped concreteblock pavers through impact echo test and compressive test, instead of the flexural test. Relative to the flexural strength requirement of 5MPa,the minimum values of compressive strength and elastic modulus, as proposed, are 13.0MPa and 25.0GPa, respectively.