高原混凝土的环境特征和裂缝控制研究

Xiaochuan Hu, Manping Liao, Ming Li, Fuqiang Wang, Xiang Lyu, Mei-Ling Zhuang
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摘要

本研究首先揭示了川藏线高原混凝土施工过程中的环境挑战和开裂特征。然后,利用水化温度湿度约束的多场耦合收缩模型,研究了高原墩身核心部位的早期和长期开裂风险。随后,分析了抗拉强度、浇筑间隔龄期和绝热温升对开裂风险的影响。最后,提出了针对高海拔混凝土开裂的各种控制措施。结果表明,高原复杂的环境导致墩身出现不同形式的裂缝,尤其是直线段的垂直裂缝。高原墩身核心裂缝的长期风险明显大于早期裂缝的风险。这种风险受混凝土抗拉强度、浇筑间隔龄期和绝热温升等因素的影响较大,应引起更多重视。变形补偿能显著提高高原混凝土的峰值和残余变形能力,在第 60 天时,峰值大于 900 με,残余变形大于 200 με,同时还能提高其抗开裂能力。采用辐射降温技术、改进施工技术和实施有效的管理措施等策略都能在提高高原混凝土抗裂性方面发挥重要作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigations on the Environmental Characteristics and Cracking Control of Plateau Concrete
In the present study, first, the environmental challenges and cracking characteristics during the construction of plateau concrete on the Sichuan–Tibet route were revealed. Then, using a multi-field coupled shrinkage model with hydration temperature humidity constraints, the early and long-term cracking risks in the core of plateau pier bodies were investigated. Later, the effects of tensile strength, pouring interval age and adiabatic temperature rise on the cracking risk were analyzed. Finally, various control measures for high-altitude concrete cracking were proposed. The results indicated that the complex environment of the plateau led to different forms of cracks in the pier body, especially vertical cracks in the straight sections. The long-term risk of core cracking in the plateau pier body is significantly greater than the risk of early cracking. This risk was strongly influenced by factors such as the concrete tensile strength, pouring interval age and adiabatic temperature rise, which should be given more attention. Deformation compensation can significantly enhance the peak and residual deformation capacities of plateau concrete, with peak values greater than 900 με and residual deformation greater than 200 με at day 60, as well as its resistance to cracking. Strategies such as adopting radiant cooling techniques, improving construction techniques and implementing effective management measures can all play a vital role in improving the cracking resistance of highland concrete.
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