胶凝砂砾石含泥量对其强度的影响

Effect of Mud Content in Cemented Sand Gravel Based on Its Strength

胶凝砂砾石骨料多为现场开挖料,含泥量较普通混凝土高得多,对混凝土的工作性能有较大的不利影响。为了给工程设计提供参考依据,进行了水胶比为1.0、1.1、1.2、1.3、1.4的情况下含泥量为0%~50%的胶砂试块强度试验和SEM电镜扫描,通过试验数据分析和微观SEM图像分析,研究了含泥量对胶凝砂砾石强度的影响。结果表明:泥在胶砂试块内部影响胶凝材料的水化反应,导致试块整体结构性变差、密实度和强度降低;随着含泥量的增加,胶砂试块强度降低,当含泥量在10%以下、水胶比为1.0左右时对胶砂试块强度影响最小,即含泥量小于10%时才能保证试块强度。

The cementitious sand gravel aggregate is mostly excavated on site,and the mud content is much higher than that of ordinary con⁃crete,which has a large adverse effect on the workability of the concrete.In order to provide a reference for the engineering design,a waterbinder ratio of 1.0,1.1,1.2,1.3,and 1.4 was carried out,the strength test and SEM Scanning electron microscope of the rubber sand test block with a mud content of 0%to 50%were studied by analyzing the test data and microscopic SEM image analysis and the effect of the strength of content sand gravel was studied.The results show that mud affects the hydration reaction of the cementitious material inside the rubber sand test block,which leads to the deterioration of the overall structure of the test block,the decrease in compactness and strength;as the mud content increases,the strength of the rubber test block decreases.When the mud content is below 10%and the water-binder ratio is about 1.0,the effect on the strength of the rubber sand test block is the smallest,that is,the strength of the test block can be guaranteed when the mud content is less than 10%.