碱集料反应与冻融循环协同作用对混凝土破坏的影响

研究了碱集料反应与冻融循环协同作用下的混凝土的破坏行为，结果表明，当混凝土先进行碱集料反应试验而随后再冻融时，碱集料反应对冻融循环有促进作用，随着碱集料反应程度的提高，混凝土开裂愈严重，随后表现的混凝土抗冻性愈差；然而当混凝土先冻融，而后再进行碱集料反应时，冻融循环对碱集料反应的促进作用则不大，随着冻融次数的增加，混凝土破坏程度增大，在继续进行的碱集料反应结束时，混凝土最终膨胀值增大，相对动弹模量损失增大，但是混凝土劣化速度则相差不大。

Effects of the Combination of Alkali-Aggregate Reaction and Freeze/Thow Cycles on Deterioration of Concrete

The behavior of concrete attacted by the combintion of alkali-aggregate reaction and freeze/thaw cycles, has been tested and the rezults show that, when AAR is in first and freeze/thaw is in later, with the increase of degree of alkali-aggregate reaction, the concrete cracking is more seriously, and the freeze/thaw damage of concrete becomes more susceptible, however, when the freeze/Thaw is in first and AAR is in later, with the increase of the freeze/thaw cycles, the expansion and the loss of relative dynamic modulus of elasticity are greater but the deterioration rates are not much different.