在水灰比分别为0.35、0.40、0.45中分别以0、10%,20%和30%的橡胶掺量配制橡胶混凝土,分别在-30 ℃、20 ℃环境下进行橡胶混凝土抗折性能研究.结果表明:低温下橡胶混凝土破坏状态和常温下相比基本一致,随着橡胶掺量增大,破坏时试件显示出一定保持整体形态的能力.常温20 ℃时,随着橡胶掺量的增加,橡胶混凝土的抗折强度降低,且下降趋势越来越快.在低温环境下,橡胶混凝土试件的抗折强度提高系数随着橡胶掺量的增加,表现出先下降后上升的趋势.在橡胶掺量相同的情况下,随着橡胶混凝土的水灰比的增加,抗折强度也提高,同时提高系数也增加; 在低温环境下,橡胶混凝土折压比变化情况与常温下的变化情况相似,低温的折压比高于常温情况,表明橡胶混凝土在低温仍具有良好的韧性.
Four kinds of rubber content concrete were prepared in three kinds of water-to-binder ratios of 0.35, 0.40 and 0.45, and the study of the flexural performance test was carried out at low temperature-30 °C and normal temperature at 20 °C. Result shows that the failure feature of the rubber concrete at low temperature is basically the same as that under normal temperature. With the increase of rubber content, the test piece shows the ability to maintain the overall shape. At the temperature of 20 °C, the flexural strength decreases with the increase of the rubber content, and the downward trend is accelerated. At low temperature, as the rubber content increases, the flexural strength increase coefficient appears to decrease first and then increase. When the rubber content is the same, the flexural strength of the rubber concrete increased as the water-to-binder ratio increases, and the coefficient of the flexural strength increases as well. With the increase of rubber content, the change trend of low temperature bend-press ratio of rubber concrete is similar to that of the normal temperature. The bend-press ratio at low temperature is higher than the normal temperature, which indicates that the rubber concrete still has good toughness at low temperatures.
