Journal of Shandong University(Engineering Science) ›› 2024, Vol. 54 ›› Issue (1): 109-122.doi: 10.6040/j.issn.1672-3961.0.2022.363

• Civil Engineering • Previous Articles     Next Articles

Experiment of the model of hydration heat temperature field and strain field of concrete single box and three chamber girder

Peng WANG1(),Cheng HUANG2,Guohao ZHAO3,Feng ZHANG3,*()   

  1. 1. China Merchants Chongqing Communications Technology Research and Design Institute Co. Ltd., Chongqing 400067, China
    2. Guangxi Road Construction Engineering Group Co. Ltd., Nanning 530001, Guangxi, China
    3. Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, Shandong, China
  • Received:2022-11-01 Online:2024-02-20 Published:2024-02-01
  • Contact: Feng ZHANG E-mail:wangpeng@cmhk.com;zhangfeng2008@mail.sdu.edu.cn

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Abstract:

In order to study the distribution law of concrete hydration heat temperature field and strain field in concrete single box and three chamber girder, a concrete box girder scaled-down(1∶2) model was cast in Laibin, 148 temperature sensors and 20 strain sensors were embedded in the concrete. Meteorological sensors were arranged, and the distribution law of hydration heat field of C60 high-strength concrete box girder was obtained through the analysis of field actual measurement data. The research results showed that the hydration heat of single-box three-compartment box girder was divided into three stages: temperature rise stage (0-24 h), rapid temperature drop stage (24-96 h) and smooth temperature drop stage (96-240 h). The average temperature of the box girder cross-section needed 179 h before it was lower than the entering temperature, the heat generated by the hydration of the box girder needed at least 7 d to be completely dissipated; the peak temperature of the whole cross-section was 24 h after pouring, and the highest area was at the pedicle axillary position, with the highest temperature reaching 90.2 ℃, and the maximum horizontal temperature difference of the top plate reached 32.2 ℃ at this time. Influenced by the layered pouring, the maximum vertical temperature difference of the side web reached 12 h after pouring 40.1 ℃, and the construction cold joints could be observed on the site. The temperature field distribution at the stalk axle was complicated, and the maximum transverse temperature difference at the stalk axle was 22.5 ℃ and the maximum vertical temperature difference was 29.9 ℃, and the transverse shrinkage strain at the surface of the stalk axil is smaller than the vertical one. The strain on the outer surface of the stalk axil is lower and constrained by the template, so the strain is smaller than that inside the stalk axil. it was calculated that there was a risk of vertical cracking in six pedicle axils, and the maximum shrinkage tensile stress was 1.51 times of the tensile strength.

Key words: heat of hydration, test model, temperature field, strain field, concrete box girder

CLC Number: 

  • U441.5

Fig.1

Diagram of model structure size"

Fig.2

Diagram of sensor arrangement"

Fig.3

Site model schematic"

Table 1

Concrete quantity per square table"

项目 每m3用量/kg 比热/(kJ·(kg·℃)-1) ω/%
水泥 422.00 0.46 17.5
砂 725.00 4.19 6.4
石 1 044.00 0.70 30.1
水 153.00 0.80 43.4
粉煤灰 53.00 0.92 2.2
减水剂 7.92 0.3

Fig.4

Meteorological conditions of hydration heat stage"

Fig.5

Cross-sectional average temperature comparison chart"

Fig.6

Two-dimensional temperature field clouds"

Fig.7

Time course curve of heat of hydration at typical location of box girder"

Fig.8

Distribution of heat of hydration along the width of the web"

Table 2

Table of changes in heat of hydration temperature of the web 单位: ℃"

边腹板温度 中腹板温度
89.40 88.40
83.68 82.78
77.96 77.16
72.24 71.54
66.52 65.92
60.80 60.30
55.08 54.68
49.36 49.06
43.64 43.44
37.92 37.82
32.20 32.20

Fig.9

Vertical temperature distribution during the hydration heat of the web"

Fig.10

Transverse temperature distribution curves of box girder"

Fig.11

Schematic diagram of the division of the pedicle axillary area"

Fig.12

Stem axillary-cross-sectional temperature time course curve"

Fig.13

Temperature gradient stratification diagram"

Fig.14

Stem axils Lateral temperature distribution"

Fig.15

Vertical temperature gradient distribution"

Fig.16

Stem axillary strain sensor arrangement"

Fig.17

Strain time curves at each section of the stem axle"

Fig.18

Strain distribution curve of measured points on the axillary surface of the roof plate"

Fig.19

Vertical strain time course curves of measurement points inside the pedicle axil of the substrate"

Fig.20

Calculation of contraction stress diagram"

Fig.21

Early-age stress at the peduncle axils"

Fig.22

Early-age cracks at the pedicle axils of the base plate"

Fig.23

Finite element calculation cloud map"

Fig.24

Geotextile effect"

Fig.25

Effect of pouring temperature"

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