What property of concrete allows and results in deterioration processes?
Permeability of concrete is what allows maximum damage. Deterioration in concrete begins with loss of water-tightness. When air or water is allowed to penetrate the concrete, carrying chemicals dissolved or dispersed in it, the concrete is said to be permeable. Permeability is mainly the hydraulic conductivity of water. Pore size, continuity of pores, micro cracks from weathering, loading effects and their connectivity determine the permeability of concrete. Cement pastes, as well as aggregates have pores and influence permeability. Low cement content, high water cement ratio, poor proportioning, inadequate mixing, improper compaction, and insufficient curing affect the process of hydration, development of hydration products, pore size, pore distribution and, consequently, the permeability of concrete. The aggregate paste bond becomes weak and allows micro crack formation. Durability is a factor that is also closely linked with the permeability of concrete. Thus, any activity that arre
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