TY - JOUR A2 - Harries, Kent A. AU - Raoufi, Kambiz AU - schitter, John AU - Bentz, Dale AU - Weiss，杰森PY - 2011 DA - 2011/08/29 TI -参数评估内部应力发展和开裂的治愈克制迫击炮经历自体变形和热负荷SP - 870128六世- 2011 AB -有限元模型用于研究胶结砂浆的性质与发展的双重压力ring test. The results of this investigation are used to explain the thermal cracking behavior of mixtures containing prewetted lightweight aggregates (LWA) by quantifying the contribution of several material properties individually. In addition to the beneficial effects of using the LWA as an internal curing agent to reduce the autogenous shrinkage of concrete, the LWA also helps to reduce the potential for thermal cracking due to a lower elastic modulus and increased stress relaxation. The rate of stress development, age of cracking, and magnitude of the temperature drop necessary to induce cracking in a dual ring specimen are dependent on a variety of factors, including the coefficient of thermal expansion of both the cementitious mortar and the restraining rings, elastic modulus of the mortar, creep effect of the mortar, and rate of thermal loading. Depending on the rate of cooling, cracking may or may not occur. The slowest rate of cooling ( 2．5 ∘ C/h)最大限度地减少蠕变的影响，而冷却速度比 8 ∘ C/h可以通过需要考虑的砂浆截面产生一个热梯度。JF - Advances in Civil Engineering(土木工程进展