冻融交替作用下煤矸石混凝土性能裂化的研究

为探究冻融交替作用下煤矸石混凝土性能裂化规律，采用快冻法，分析不同水灰比和含气量对其质量、动弹性模量及强度等方面损失特性影响。结果表明：质量损失率与循环数呈正相关，其显著性为水灰比0.75>水灰比0.65>水灰比0.55；水灰比为0.65和0.75时，其相对动弹性模量显著降低，降低变化率分别为9.56%、11.2%；不同含气量条件下强度损失率与循环数呈正相关，显著性为含气量1.8%＞含气量3.5%＞含气量4.4%。

Experiment Study on Properties Deterioration of Coal Gangue Concrete under Alternative Effect of Freezing-thawing

AbstractIn order to study the properties deterioration of coal gangue concrete under alternative effect of freezing-thawing. Research the loss characteristics of coal gangue concrete quality, dynamic elastic modulus, and compressive strength under different water cement ratio and air content by quick freezing method. The results showed that the relationship between weight loss rate and cycle number was positive, and the signiifcant strength was water cement ratio 0.75>water cement ratio 0.65>water cement ratio 0.55. When the water cement ratio was 0.65 and 0.75, the relative dynamic elastic modulus was signiifcantly decreased and the reduction rate was 9.56% and 11.2%, respectively. The relationship between relative compressive strength loss rate and cycle number was positive under different air content, and the signiifcant strength was air content 1.8%>air content 3.5%>air content 4.4%.