Early cracks are the primary threat to the durability of concrete structures, which originate from stress exceeding limits caused by temperature deformation and shrinkage deformation constraints.
This article deeply analyzes the formation mechanism of early temperature and stress fields in concrete, and systematically discusses the comprehensive strategy of preventing cracks from the material source through mix proportion optimization.
The focus was on exploring the mix proportion methods to reduce hydration heat and optimize shrinkage performance, and the technical principles and applications of compensating shrinkage concrete (especially MgO expansion agent) were introduced.
The article emphasizes that “crack resistance” should be included as a key constraint condition in the multi-objective optimization design system of concrete mix proportions, to achieve the synergistic optimization of material performance, durability requirements, and economy.
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