Journal of Jilin University(Engineering and Technology Edition) ›› 2025, Vol. 55 ›› Issue (7): 2343-2353.doi: 10.13229/j.cnki.jdxbgxb.20231113

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Creep properties of concrete under hydrothermal coupling curing

Wei-jing YAO1,2,3(),Meng-yu BAI1,Hai-bing CAI1,3,Tao LIU1   

  1. 1.School of Civil Engineering and Architecture，Anhui University of Science and Technology，Huainan 232001，China
    2.Postdoctoral Science Research Workstation，Wuhu Surveying and Mapping Design Institute Co. ，Ltd. ，Wuhu 241000，China
    3.Anhui Key Laboratory of Mining Construction Engineering，Anhui University of Science and Technology，Huainan 232001，China
  • Received:2023-10-17 Online:2025-07-01 Published:2025-09-12

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Abstract:

To study the influence of hydrothermal coupling curing at different temperatures on the creep characteristics of concrete， uniaxial compression test， multistage creep test， and scanning electron microscope （SEM） test of concrete after hydrothermal coupling curing at 20， 40， 60， 80 ℃ were conducted. The results show that the strength of concrete under different temperatures in hydrothermal coupling curing is significantly higher than that of normal curing in the 20 days of curing. The maximum increase rate of concrete strength under the hydrothermal coupling curing at 60 ℃ is 54.8%. Then the strength of concrete decreases at different temperatures hydrothermal coupling curing， and the strength is lower than the normal curing after curing 60 days. With the increasing hydrothermal coupling temperature， the creep performance of concrete first increases and then decreases. The creep properties of concrete were significantly improved after the hydrothermal coupling at 60 ℃， and the creep strength was increased by 22.24%， the creep time was extended by 23.95 hours， the instantaneous strain and creep strain were decreased by 6.4% and 32%， respectively， compared with normal curing. However， after experiencing hydrothermal coupling at 80 ℃， it will have a greater negative effect on the concrete creep properties. Based on the test results， the Burgers creep model agrees well with the creep test data.

Key words: structure engineering, hydrothermal coupling curing, concrete, creep, constitutive model, micro structure

CLC Number: 

  • TU528

Table 1

Chemical composition of cement"

组成SiO2Al2O3Fe2O3CaOMgOSO3烧失量
质量分数/％22.605.034.3863.111.462.241.18

Table 2

Chemical composition of fly ash"

组成Al2O3SiO2SO3CaOFeH2O烧失量
质量分数/％30503110.8~1.011.18

Table 3

Test mix ratio"

混凝土水泥粉煤灰碎石砂水减水剂
C3042050856856211.54.7

Fig.1

Relationship between concrete compressive strength and hydrothermal coupling curing age"

Fig.2

Creep-strain time curves after hydrothermal coupling curing at different temperatures"

Table 4

Results of creep test of concrete after hydrothermal coupling curing at different temperatures"

试件

编号

加载级数

蠕变

总时长/h

蠕变破坏

应力/MPa

蠕变破坏应力/

单轴峰值应力

NC-20560.0727.520.64
DW-20672.2930.590.88
DW-40560.4427.520.77
DW-60784.0233.640.92
DW-80672.0330.570.99

Fig.3

Relationship between instantaneous strain and stress level after hydrothermal coupling curing at different temperatures"

Table 5

Fitting formula of instantaneous strain and stress"

试件编号拟合公式斜率k截距dR2
NC-20y=0.022 1x+0.102 10.022 10.102 10.99
DW-20y=0.022 3x+0.115 20.022 30.115 20.99
DW-40y=0.017 6x+0.058 50.017 60.058 50.99
DW-60y=0.017 2x+0.143 50.017 20.143 51.00
DW-80y=0.027 6x+0.112 20.027 60.112 21.00

Fig.4

Creep strain of concrete after hydrothermal coupling curing at different temperatures"

Fig.5

Creep rate of DW-20 and DW-80 ateach stress level"

Fig.6

Steady state creep rate of concrete ateach stress level"

Fig.7

Creep ratio of concrete at each stress level"

Fig.8

Burgers model"

Table 6

Burgers model parameters for DW-80 concrete at each stress level"

等级

应力/

MPa

K/GPaEK/GPaEM/GPaηK/（GPa·h）ηM/（GPa·h）
11220.8317.620.9075.98309.67
21546.3031.840.96162.28522.32
31841.6730.951.04145.68510.87
42115.989.261.2131.69141.22
52434.1921.801.09106.66333.55
62718.7511.191.2175.77155.97

Fig.9

DW-80 creep measured value and prediction line at each stress level"

Fig.10

Microscopic morphology of concrete after hydrothermal coupling curing"

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