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随着我国基础建设的飞速发展,大体积混凝土的应用日益增多(包括水坝、桥梁的承台及基础、高层建筑的箱型基础等),而大体积混凝土施工中普遍会遇到裂缝控制问题。因为混凝土体积较大时,内部产生大量的水化热,使混凝土内外形成温差。在受到内外约束的情况下,混凝土内部将产生较大的温度应力,并导致裂缝产生,最终为工程结构埋下严重质量隐患。因此,大体积混凝土施工中应严格控制裂缝产生和发展,以保证工程质量。通过研究大体积混凝土裂缝的类型,分析了裂缝产生的原因,并在前人研究的基础上,提出了设计方面、材料方面、施工方面等裂缝控制措施,能有效控制大体积混凝土的裂缝产生。
With the rapid development of China’s infrastructure construction, the application of mass concrete is increasing (including the dams and foundation of dams and bridges, the box foundation of high-rise buildings, etc.), and cracks control problems are commonly encountered in mass concrete construction. Because of the larger volume of concrete, a large amount of hydration heat generated inside and outside the concrete to form a temperature difference. In the case of internal and external constraints, the concrete will have a greater temperature stress and lead to cracks, eventually laying a serious quality problems for the engineering structure. Therefore, mass concrete construction should be strictly controlled crack generation and development in order to ensure the quality of the project. By studying the types of cracks in mass concrete, the causes of cracks are analyzed. Based on the previous studies, cracks control measures are put forward, such as design, material and construction, which can effectively control the cracks in mass concrete.