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本论文提供常压下混凝土试件在70°～450°F(21°～232℃)的六种不同温度(在每种温度下施加三个级别的应力)的受热状态下,经过11个月的徐变及徐变回缩情况,并与以前进行的相同的大体积混凝土对应的试验结果作对比。一般说来,徐变随温度的升高而增加,但当温度超过16°F(71℃)时,则徐变随温度的继续升高而减少。温度为160°F时的徐变约为70°F(21℃)时徐变的3倍,但比大体积混凝土相对应的徐变要小得多。在某些情况下,当其他条件相同时,密封混凝土的徐变是非密封混凝土徐变的5倍多。徐变与应力—强度比值是线性关系。文中提出了徐变机理的假定。
In this paper, under normal pressure, concrete specimens are heated at six different temperatures (applying three levels of stress at each temperature) from 70° to 450°F (21° to 232°C) for 11 months. The creep and creep retraction conditions are compared with the corresponding test results of the same mass concrete used previously. Generally speaking, the creep increases with increasing temperature, but when the temperature exceeds 16°F (71°C), the creep decreases as the temperature continues to rise. The creep at 160°F is approximately three times the creep at 70°F (21°C), but much smaller than the corresponding creep of mass concrete. In some cases, when the other conditions are the same, the creep of the sealed concrete is more than five times that of the unsealed concrete. Creep and stress-strength ratios are linear. The hypothesis of the creep mechanism is proposed in this paper.