路面机制砂水泥混凝土的抗滑耐久性研究

Study on anti-skid durability of pavement manufactured sand cement concrete

从路面机制砂水泥混凝土的抗滑耐久性机理分析出发,研究了不同水灰比、砂率、细度模数、石粉含量和河砂掺量对混凝土抗滑性和耐磨性的影响规律,并将两者联系起来,对抗滑耐久性进行了研究。研究结果表明:机制砂的细度模数和石粉含量是影响路面混凝土抗滑性的关系因素,降低水灰比、降低砂率、增大细度模数、减少石粉含量和增加河砂掺量均能提高抗滑性。耐磨性可用表面回弹值间接评价,在一定范围内耐磨性随着水灰比增大而快速下降,细度模数、石粉含量、河砂掺量和砂率对耐磨性影响不大。降低水灰比是提高机制砂路面混凝土抗滑耐久性的重要措施,机制砂路面混凝土的优化,在保证水灰比满足耐磨性要求前提下,主要优化抗滑性。

Based on the analysis of the anti-skid durability of the pavement manufactured sand cement concrete,the effects of different water-cement ratio,sand ratio,fineness modulus,stone dust content in manufactured and river sand content on the skid resistance and abrasion resistance of concrete was studied,and the two factors were combined to study the anti-skid durability.Results show that fineness modulus and stone dust content of the manufactured sand are the related factors affecting the skid resistance of the pavement concrete,and the skid resistance can be improved by reducing the water-cement ratio,reducing the sand ratio,increasing the fineness modulus,reducing the stone dust content and increasing the content of river sand.Abrasion resistance can be evaluated indirectly by surface rebound value.In a certain range,the abrasion resistance decreases rapidly with the increase of water-cement ratio,and the fineness modulus,stone dust content,river sand content and sand ratio have little influence on the abrasion resistance.Reducing the water-cement ratio is an important measure to improve the anti-skid durability of pavement manufactured sand cement concrete.The optimization of the pavement manufactured sand cement concrete mainly optimizes the skid resistance on the premise of ensuring that the water-cement ratio meets the requirements of abrasion resistance.