不同强度等级混凝土尺寸效应试验研究

Experimental study on impact of strength grade on size effect of concrete strength

为了研究不同强度等级混凝土强度的尺寸效应,分别对C15、C20和C30等级混凝土,边长分别为100、150和150 mm的立方体试件进行了抗压和劈裂抗拉试验。建立了不同强度等级混凝土抗压与劈裂抗拉强度尺寸效应律的计算式,并通过试验数据验证了其适用性。试验结果表明,混凝土的立方体抗压强度和劈裂抗拉强度均存在尺寸效应,随着强度等级增大尺寸效应显著性逐渐增大;抗拉尺寸效应大于抗压尺寸效应。

In order to investigate the size effectof different strength grade concrete,a series of compression and tensile splitting tests were performed on 54 cubic specimens with three different strength grades of C15,C20 and C30,and the specimen size length of 100, 150 and 200 mm. The size effect equation on the concrete was proposed based on the test result. The results show that the size effect ob-viously exists in the cubic compressive and tensile splitting strength of all three strength grades,and that the size effect is significantly enhanced with the increase of the strength grade. The size effect of tensile splitting strength is much strong than that of compressives-trength.