硅粉掺量对钢纤维混凝土抗冲耐磨性能的影响

Effect of Silica Content on Anti-wear Resistance of Steel Fiber Reinforced Concrete

基于钢纤维掺量为0.8%的3个不同等级的混凝土,在满足和易性要求的前提下,掺入不同量的硅粉进行配合比试验,利用HNK-3型混凝土抗含沙水流冲刷仪对多组混凝土进行抗冲耐磨试验.结果表明,混凝土抗冲耐磨强度随着硅粉掺量的增加呈现出先增强后减弱的趋势,硅粉掺量临界点10%对应其抗冲耐磨的峰值强度.对比4个硅粉掺量的钢纤维混凝土微观影像可知,临界点处的硅粉掺量能最有效的提升钢纤维、水泥和混凝土骨料之间的黏结力,使钢纤维混凝土的抗冲耐磨强度获得显著提升.

Concrete abrasion resistance was an important indicator to estimate the quality of hydraulic structures,itdirectly affected the safety and durability of hydraulic structures under the velocity of silt laden flow. This study wascarried out under the premise of the workability requirement with different amount of silicon powder which mixedproportion based on 0.8% content steel fiber of three different grades of concrete. We tested the impact abrasionresistance of several groups concrete using the instrument HNK-3. The results showed that anti-wear resistanceof concrete obviously strengthens with the increasing amount of silicon powder,it was a tendency to increase firstlyand then decrease. The critical point 10% of silicon powder was corresponded to its peak strength of impact abrasionresistance. Comparing the microscopic images of four different dosage silicon powder of steel fiber reinforced concrete,it indicated that the critical point of silicon powder was most effectively enhanced cohesive force between steel fiber,cement and concrete aggregate. It could improve the anti-wear resistance of steel fiber reinforced concrete.