Temperature Control and Crack Prevention Strategies in the Construction of Large Volume Concrete
Journal: Architecture Engineering and Science DOI: 10.32629/aes.v5i4.3208
Abstract
This paper delves into the intricacies of temperature control and crack prevention in the construction of large volume concrete structures, emphasizing their criticality for maintaining structural integrity and longevity. The primary challenges arise from the exothermic hydration of cement, leading to substantial internal temperature variations and consequent thermal stresses. To address these, the paper explores a comprehensive approach starting with the selection of raw materials and mix design. It advocates for the use of low-heat cement, supplementary cementitious materials like fly ash and slag, and strategic aggregate selection to mitigate heat generation. The paper further discusses the importance of optimizing the water-cement ratio and incorporating admixtures to enhance workability without compromising strength.During the construction processes, the paper highlights the significance of scheduling placements to avoid peak heat, using chilled water and ice in the mix, and implementing proper curing practices to manage temperature gradients effectively. It also underscores the role of temperature monitoring and hydration control through the use of slow-release admixtures. In the context of crack prevention, the paper outlines proactive measures such as material selection, mix design optimization, and construction practices that help preempt the formation of cracks. For existing cracks, it discusses treatment techniques like epoxy injection and the application of fiber-reinforced polymers to restore structural integrity.
Keywords
temperature control, crack prevention, large volume concrete, construction practices
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[6]Li, Maosen,Wang, Lu,Wang, Jun, et al.Research Progress on Carbonation Behavior of Concrete with Large Volume of Mineral Admixture[J].Bulletin of the Chinese Ceramic Society,2023,42(11):3787-3798.
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[9]Li, Jinhui,Yu, Zi,Wu, Jing, et al.The Application of Heat-Shrinkable Fibers and Internal Curing Aggregates in the Field of Crack Resistance of High-Strength Marine Structural Mass Concrete: A Review and Prospects[J].POLYMERS,2023,15(19).DOI:10.3390/polym15193884.
[10]Jiaxiang, Xu,Tao, Yang,Cao, Wang, et al.Temperature effects and damage characteristics of concrete pour in large-volume floor of subway-station baseboard[J].ENGINEERING REPORTS,2024,6(07).DOI:10.1002/eng2.12802.
[11]Su, Hui,Luan, Yawei,Ma, Qiujuan, et al.Effect of Different Temperatures on the Hydration Kinetics of Urea-Doped Cement Pastes[J].MATERIALS,2022,15(23).DOI:10.3390/ma15238343.
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