纤维网格布表层强化混凝土早期开裂特性

Early cracking characteristics of concrete strengthened with fiber mesh

为解决机场道面水泥混凝土在施工期易产生早期微裂缝,给使用期飞机运行带来安全隐患的问题,提出通过在混凝土表层砂浆层中布设纤维网格布的方式强化机场道面的表面性能。选择了碳纤维、芳纶纤维和玄武岩纤维3种纤维网格布作为强化材料,以水泥砂浆早期开裂性能表征混凝土早期抗开裂性能,探究了在高温多风模拟环境下水灰比、灰砂比、细度模数和纤维网格布对水泥砂浆早期抗开裂性能的影响。结果表明,当水灰比为0.43、灰砂比为0.47、细度模数为3.4时,水泥砂浆早期抗开裂性能最好;当纤维网格布为玄武岩纤维网格布,网格尺寸为3 mm×3 mm时水泥砂浆早期抗开裂性能强化效果最好。

In order to solve the problem that the cement concrete of the airport pavement is easy to produce early micro cracks during the construction period and bring potential safety hazards to the aircraft operation during the service period, this study proposed a method to strengthen the surface performance of the airport pavement by laying fiber mesh in the concrete surface mortar layer. Carbon fiber, aramid fiber and basalt fiber mesh were selected as reinforcement materials to characterize the early cracking resistance of concrete with the early cracking performance of mortar. The effects of water cement ratio, cement sand ratio, fineness modulus and fiber mesh on the early cracking resistance of cement mortar in high temperature and multi wind simulation environment were studied. The results show that the early cracking resistance of cement mortar is the best when the water cement ratio is 0.43, the cement sand ratio is 0.47 and the fineness modulus is 3.4, and when the fiber mesh is basalt fiber with a grid size of 3 mm ×3 mm, the strengthening effect of early cracking resistance is the best.