CRTSⅢ型普通钢筋混凝土轨道板预制浇筑水化热分析-《高速铁路技术》

文章信息/Info

Title:: Study on Pouring Hydration Heat of CRTSⅢ Ordinary Reinforced Concrete Track Slab

作者:: 李保友; 姜恒昌; 张光明; 康维新; 杨荣山; 1. 中铁二院工程集团有限责任公司, 成都 610031;
2. 西南交通大学, 成都 610031

Author(s):: LI Baoyou; JIANG Hengchang; ZHANG Guangming; KANG Weixin; YANG Rongshan; 1. China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China;
2. Southwest Jiaotong University, Chengdu 610031, China

Keywords:: precast|pouring|hydration heat|early strength|temperature|peak value

摘要:: 轨道板预制浇筑过程中，随着浇筑的进行，混凝土水化反应剧烈，且由于此时混凝土强度较低，较强的水化反应会对轨道板的预制质量产生影响。针对这一问题，文章开展CRTSⅢ型普通钢筋混凝土轨道板预制浇筑水化热变化的监测试验，明确轨道板预制浇筑过程中承受的温度荷载；采用有限元方法对预制过程中的应力变形进行分析，研究预制浇筑过程中水化热的产生对轨道板质量的影响。结果表明：（1）预制浇筑过程中，轨道板温度随着时间的变化先增大后减小，其中轨道板中部的温度峰值高于上下表面的峰值；（2）轨道板预制浇筑阶段，应对轨道板内部水化热进行重点关注，防止出现整体温降超过18℃的情况，以保证轨道板的预制质量。

Abstract:: During the pouring process of the track slab, the concrete hydration reaction is intense, and because the concrete strength is low at this time, the strong hydration heat reaction will affect the prefabrication quality of the track slab. Therefore, the change of hydration heat in the precasting of CRTSⅢ ordinary reinforced concrete track slab is monitored and tested to determine the temperature load during the pouring process of the track slab. The finite element method was used to analyze the stress and deformation of the prefabrication process, and the influence of the hydration heat on the quality of the track slab during the precasting process was studied. The results show that:(1) during the pouring process, the temperature of the track slab increases first and then decreases with the change of time, and the peak value of temperature in the middle of the track slab is higher than that in the upper and lower surfaces; (2) during the pouring stage of the track slab, the internal hydration heat of track slab should be continuously monitored to prevent the overall temperature drop of more than 18℃, so as to ensure the precast quality of track slab.