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中文摘要：
采用温度-应力试验机,研究了两种骨料组合的大坝混凝土在绝热、温度匹配及20℃恒温养护模式下的综合抗裂性,并以绝热模式的混凝土成熟度为基准,控制恒温与温度匹配模式试验开始降温的时间和降温速率（0.5～1.0℃/h）.结果表明：绝热养护模式下混凝土应力发展较快,开裂温度较高,两种混凝土的抗裂性能差别较显著;另两种模式下,两种混凝土抗裂性能相当;绝热模式高估了起始降温点、低估了混凝土抗裂能力,恒温模式不能体现温升产生的预压应力的影响、混凝土开裂温度偏低,温度匹配模式客观体现了温度历程对实际结构物应力和开裂温度的影响.
英文摘要：
The complex crack resistance of dam concretes cured by three modes,i.e.adiabatic curing,temperature matched curing（TMC） and 20 ℃ constant temperature curing,were studied through the temperature stress testing machine.Based on the maturity of concrete under adiabatic mode,the start time of cooling and cooling rate（i.e.0.5~1.0 ℃/h） of other two curing modes were determined.Two kinds of aggregates combination were used in the tested dam concretes.Different to the test results of concretes under the curing modes of constant temperature and TMC,the tensile stress of concrete develops faster and the cracking temperature of concrete is higher under the adiabatic curing mode.Meanwhile,the crack resistance of concrete can be easily distinguished and evaluated under the adiabatic curing mode than under other two curing modes.However,the beginning point of cooling is overestimated and the crack resistance of concrete is underestimated under the adiabatic curing mode.Moreover,the influence of precompressive stress on the crack resistance of concrete cured under the constant temperature can not be obviously evaluated,and the cracking temperature of concrete is lower than true value under this curing condition.The test results show that the influence of the temperature history on the stress development and crack resistance of concrete could be reasonably investigated only under TMC condition.
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