再生骨料黏附砂浆含量对人工成孔透水混凝土抗冻性的影响

Effect of Recycled Aggregate Attached Mortar Content on Frost Resistance of Artificial Porous Pervious Concrete

研究了不同冻融工况下黏附砂浆含量对高强再生透水混凝土抗冻耐久性的影响,并用SEM对其微观机理进行了分析。结果表明,300次冻融循环后,以相对动弹性模量不低于60%和抗压强度损失率不高于25%为失效准则,确定了再生粗骨料黏附砂浆的界限含量分别为41.19%和43.89%。在设计使用年限分别为100年、50年和30年的严寒地区高度饱水条件下,再生粗骨料最大黏附砂浆含量分别为33.00%、38.94%和40.27%。

The influence of attached mortar content on the frost resistance of high strength recycled pervious concrete under different freeze-thaw conditions was studied,and the microscopic mechanism was analyzed by SEM.The results show that after 300 freezing-thawing cycles,taking the relative dynamic elastic modulus of not less than 60%and the loss rate of compressive strength not more than 25%as the failure criterion,the limit content of recycled coarse aggregate attached mortar is determined to be 41.19%and 43.89%,respectively.When the designed service life is 100 years,50 years and 30 years respectively,the maximum attached mortar content of recycled coarse aggregate applied for structural concrete is 33.00%,38.94%and 40.27%,respectively.