【摘要】 骨料对于混凝土断裂性能的影响是近年来各国学者普遍关心的课题。采用基于粘性裂纹模型(FCM)的数值分析方法,通过三点弯曲试验,评价了粗细骨料比例(砂率:0.30-0.67)及水泥石强度(混凝土抗压强度:40-80MPa)对混凝土断裂参数的影响。这些参数包括抗拉强度、抗弯强度、应力-裂纹宽度关系和断裂能。研究结果表明,骨料总量一定而粗骨料含量不同时,抗压强度几乎不受影响,而随粗骨料含量增加,抗拉强度、抗弯强度和断裂能均逐渐增大。同时,水泥石强度增高,开裂强度、抗拉强度、抗弯强度和断裂能均增大。更多还原

【Abstract】 The effect of aggregate combination (the ratio of fine aggregate to the sum of fine and coarse aggregates in weight from 0.30 to 0.67) and matrix strength (compressive strength from 40 to 80MPa) on the fracture parameters, including tensile strength, flexural strength, stress-crack width (w-s) relationship as well as fracture energy are evaluated from three point bending test results by means of fictitious crack model based analyses. The results show that for a constant total aggregate amount, the compressive strength is almost not influenced by varying the coarse aggregate content. Tensile strength, flexural strength as well as fracture energy determined from the (w-s) relation can be enhanced by adding more coarse aggregate. However, the above enhancement is gradually reduced with the increase of matrix compressive strength.更多还原