|Table of Contents|

Study on hydration heat temperature effect and cracking risk of precast concrete box culvert in alpine region(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2025年02期
Page:
153-164
Research Field:
桥隧工程
Publishing date:

Info

Title:
Study on hydration heat temperature effect and cracking risk of precast concrete box culvert in alpine region
Author(s):
LI Fulu1;  MA Zhiyuan2;  ZHANG Yongliang3;  QIAN Song3;  LIU Jiang2
(1. Qinghai Traffic Control Construction Engineering Group Co., Ltd., Xining 810002, Qinghai, China; 2. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 3. China United Northwest Institute for Engineering Design & Research Co., Ltd., Xi'an 710076, Shaanxi, China.)
Keywords:
hydration heat;  concrete box culvert;  alpine region;  temperature effect;  cracking risk
PACS:
U448.21
DOI:
10.19815/j.jace.2023.06055
Abstract:
In order to study the distribution law of hydration heat temperature field of large size precast concrete box culvert in alpine area, and reduce early age cracking risk during precast of box culvert, the finite element simulation calculation of hydration heat temperature of precast concrete box culvert in Qinghai area was carried out, and the time history change and temperature distribution characteristics of hydration heat temperature of concrete box culvert were analyzed. Based on the temperature stress calculation method considering the growth of concrete age, the cracking risk of concrete box culverts during the hydration heat release period was evaluated. The effects of different factors on the effect of hydration heat temperature on concrete box culverts were obtained by parametric analysis. The results show that the temperature time history change process of concrete box culverts affected by hydration can be divided into hydration heating stage, hydration cooling stage and environmental influence stage. The distribution of hydration heat temperature shows a radial distribution with the shape center as the midpoint. The stress levels on the top and bottom surfaces of concrete box culvert are relatively high, with the highest stress at the inner side of the chamfer top surface, which is 1.71 MPa. The chamfer position of the concrete box culvert has the highest cracking risk due to the significant secondary stress generated by the frame effect. The material properties, structural parameters, and environmental effects have a significant impact on the hydration heat temperature during precast of concrete box culverts, with the most significant effect of material properties. By reducing the cement hydration heat release, reducing the concrete cement mixture, reducing the size of box culvert, reducing the initial temperature, reducing the top surface flow heat transfer coefficient and other parameters can effectively reduce the risk of early cracking of concrete box girders. The design and construction plan of concrete box girder can be optimized by adjusting material properties, structural parameters and environmental effects to reduce the risk of early cracking.

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Last Update: 2025-03-20