Experimental Study on Size Effect in Strength of Pervious Concrete and its Associated Factor

Abstract:

Based on the test results of compressive strength and splitting strength of three kinds of cubic specimens of pervious concrete whose side length is respectively 100mm, 150mm and 200 mm, the size effect on strength and its associated impact factors which include porosity and particle size of coarse aggregate analyzed. In the test, water cement ratio of every group of concrete mix proportion is constant. The main results are as follows: (1) Size effect on concrete of the pervious concrete is greater than that of ordinary concrete; (2) Size effect on splitting strength is greater than that on cubic compressive strength. (3) Size effect on splitting strength significantly increases with the increase of the aggregate size; (4) Weibull modulus m obtained in statistical test for compressive strength equals to 9, which should be more than twice the value of tensile strength. (5)Size effect on strength of concrete is related to its statistical discreteness, that is, the size effect is more obvious when the dispersion coefficient Cv is greater; (6)Weibull’s statistical size effect can be used to describe the size effect on strength indicators of concrete; Theoretical values of Weibull’s statistical size effect derived from the experiment agree with the test results well. (7) The abnormal trends of size effect are related to the abnormal changes of dispersion coefficient.

• Periodical: Advanced Materials Research (Volumes 634-638)
• Pages: 2684-2692
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.634-638.2684
• Online since: January 2013
• Authors: Xi Xi He, Shan Wu
• Keywords: Dispersion Coefficient, Pervious Concrete, Porosity, Size Effect, Strength

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