A comparative study of temperature of mass concrete placed in August and November based on on-site measurement

Hu, Yehong; Chen, Jin; Zou, Feng; He, Meng; Mao, Jianguo; Liu, Xinglin; Zhou, Canjun; Zhong-xia, Yuan

doi:10.1016/j.cscm.2021.e00694

Cited by 5 publications

(2 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A literature review showed that the long-term internal temperature of mass concrete is approximately 40 °C (Saeed et al, 2015;Hu et al, 2021;El-Mir et al, 2022). Therefore, this paper studied the hydration mechanism and durability of LHCC used for dam concrete under 40 °C water curing through thermodynamic modeling and experiments.…”

Section: Introductionmentioning

confidence: 99%

Hydration and durability of low-heat cementitious composites for dam concrete: Thermodynamic modeling and experiments

Zhang

2023

Front. Mater.

View full text Add to dashboard Cite

To demonstrate the superiority of dam concrete, a systematic study was conducted to examine the durability of low-heat cementitious composite (LHCC) that is composed of Portland cement (PC), fly ash (FA), and MgO expansive additive (MEA) with PC as the reference group. Through GEMS software, XRD, SEM, and EDS, the difference mechanism in durability between the two cementitious materials was revealed from the perspectives of phase evolution and microstructural characteristics. Water at 40 °C was adopted for curing in the study to match the long-term temperature field inside the concrete dam. According to the results of the RCM, accelerated carbonation, and rapid freeze–thaw cycle experiments, LHCC outperforms PC in durability. The hydration process of LHCC is simulated by inputting the reaction degree of each phase calculated using the MPK model into the GEMS software. The thermodynamic model output shows that portlandite first increases and then decreases as LHCC hydration proceeds, and C-S-H and stratlingite are supplemented in the later stage, which reflects the high performance of FA involved in hydration. In addition, hydrotalcite that is capable of chloride ion adsorption is increasingly generated with the consumption of brucite. As is clearly shown in the SEM images, there are denser space grids formed by overlapping C-S-H in LHCC with almost no capillary pores. Meanwhile, when combined with the results of EDS, it is strongly demonstrated that the FA in LHCC can be hydrated to produce dense fibrous C-S-H in large amounts, providing a basis for the positive development of durability.

show abstract

Section: Introductionmentioning

confidence: 99%

Hydration and durability of low-heat cementitious composites for dam concrete: Thermodynamic modeling and experiments

Zhang

2023

Front. Mater.

View full text Add to dashboard Cite

show abstract

“…The involvement of more cement in the hydration reaction also means more heat is generated inside the concrete. Because the temperature environment inside the mass concrete is similar to adiabatic conditions [ 9 ], the lower thermal conductivity of concrete [ 10 ] prevents heat from dissipating inside mass concrete promptly, and the high temperature inside the concrete promotes the hydration reaction of cement particles [ 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Fineness of Cement on the Autogenous Shrinkage of Mass Concrete under Variable Temperature Conditions

et al. 2023

View full text Add to dashboard Cite

The internal temperature of the mass concrete is not constant. In the actual project, the internal temperature of the concrete will experience a process of rapid warming to reach the peak temperature and then slow down. In this study, volume measurement method is used to simulate the internal volume deformation of mass concrete under actual engineering conditions. The embedded strain gauge was embedded in concrete with a water–cement ratio of 0.32 for 28 days, and the development of total volume deformation and autogenous volume deformation of concrete under variable temperature conditions was studied by external heating of concrete. The results show that the finer the cement, the earlier the concrete starts to shrink, and the greater the total shrinkage of the concrete. The high temperature will promote the hydration of cement with different fineness and will reduce the total porosity of their paste, but the proportion of harmful pores in the paste with finer cement particles is lower.

show abstract

Experimental and finite element investigations on hydration heat and early cracks in massive concrete piers

Sheng

Xiao

Zheng

et al. 2023

Case Studies in Construction Materials

View full text Add to dashboard Cite

A comparative study of temperature of mass concrete placed in August and November based on on-site measurement

Cited by 5 publications

References 3 publications

Hydration and durability of low-heat cementitious composites for dam concrete: Thermodynamic modeling and experiments

Hydration and durability of low-heat cementitious composites for dam concrete: Thermodynamic modeling and experiments

Effect of Different Fineness of Cement on the Autogenous Shrinkage of Mass Concrete under Variable Temperature Conditions

Experimental and finite element investigations on hydration heat and early cracks in massive concrete piers

Contact Info

Product

Resources

About