摘要
机场水泥混凝土道面表面的砂浆层易开裂和剥落,产生大量粉尘和碎屑,影响跑道的正常使用。采用ANSYS软件模拟分析了纤维网格布种类、尺寸、埋置深度、约束钢筋直径以及布置密度对混凝土道面表层砂浆层早期抗开裂性能的影响。结果表明,纤维网格布能减少水泥砂浆层的裂缝,但对整体开裂损伤影响较小,不同种类纤维网格布对水泥砂浆开裂损伤的影响相近;网格尺寸越小,砂浆内部微观开裂损伤越明显,但依然能起到抑制宏观裂缝发生和扩展的效果;纤维网格布埋置深度越大,砂浆表层收缩应力越大,越容易增大中心十字形裂缝的扩展;约束钢筋直径越小,砂浆表层裂缝损伤越小,中心处裂缝数量越少;约束钢筋布置密度越大,对砂浆收缩的约束作用越强,但微观裂缝造成的总体损伤越大。
The mortar layer formed on the surface of airport cement concrete pavements is susceptible to cracking and peeling,which generates significant dust and debris,thereby affecting the normal operation of the runway.ANSYS software was employed to simulate and analyze the effects of various factors such as the type,size,and embedding depth of fiber mesh,as well as the diameter and layout density of constraint reinforcement on the early crack resistance performance of the mortar layer.The results indicate that fiber mesh can effectively reduce cracks in the cement mortar layer but has limited influence on overall cracking damage.Different types of fiber mesh exhibit similar effects on crack inhibition.Smaller mesh sizes tend to induce more pronounced micro-cracking within the mortar.However,these micro-cracks are constrained by the fiber mesh structure and thus remain localized,contributing to the suppression of macro-crack initiation and propagation.Greater embedding depth of the fiber mesh increases surface shrinkage stress,making the central cross-shaped cracks more likely to expand.A smaller diameter of constraint reinforcement leads to reduced surface cracking and fewer central cracks.The greater the density of constraint reinforcements,the stronger the restraining effect on mortar shrinkage,but the greater the overall damage caused by microcracks.
作者
肖定侃
张俊
张晨
周勇
许巍
邬娟
XIAO Dingkan;ZHANG Jun;ZHANG Chen;ZHOU Yong;XU Wei;WU Juan(College of Civil Aviation,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;College of Aeronautical Engineering,Air Force Engineering University,Xi'an 710038,China;Air Force Research Institute,Guangzhou 510052,China)
出处
《新型建筑材料》
2025年第8期64-69,共6页
New Building Materials
基金
国家自然科学基金项目(52308470)
陕西省自然科学基础研究计划项目(2023-JC-YB-375)。
关键词
机场道面
早期抗开裂性能
表层强化
纤维网格布
仿真分析
airport pavement
early crack resistance
surface strengthening
fiber mesh cloth
simulation analysis
作者简介
肖定侃,男,2000年生,硕士研究生,E-mail:dingkan.X@nuaa.edu.cn;通讯作者:张俊,博士,副教授,E-mail:zhangjun_afeu@sina.com。
