How The Concrete Formed After Hydration Essay - 1372 Words

INTRODUCTION When cement is mixed with water in order to prepare concrete, the hardened concrete formed after hydration is not a solid mass but a porous material. There is formation of pores due to water which is initially added. Water occupies some fraction of the total initial volume and after the hydration of cement water is held physically, chemically or is adsorbed on product after hydration. This leads to formation of different types of pore structure inside the hydrated cement. CLASSIFICATION OF PORES STRUCTURES IN HYDRATED CEMENT 1. Capillary pores:-The hydration of cement leads to formation of a network of hydrated solid product with the left empty spaces between the hydrated products that are occupied by water left after hydration. These residual spaces are known as capillary pores. The capillary porosity of the cement paste depends on the original water-cement ratio and on the amount of cement that has become hydrated. Capillary pores volume reduces with time by precipitation of hydrates, into originally water filled space. Capillary pores have high irregular shapes. Capillary pores are assumed to have a major effect on transportation process but only minor effect on hydration rates. These pores represents about 18.5% of the original volume of dry cement. Further classification of capillary pores are a) Large capillary pores: - These are pores with large space and they b) Medium capillary pores: - These are medium poresShow MoreRelatedEssential Materials And Establishing The Compressive Strength1326 Words   |  6 PagesIntroduction Concrete is a vital construction material and establishing the compressive strength is key as the ability to maximise the compressive strength will enhance a structures lifespan. Mortar is formed through the mixing of cement and water before being cast to harden. When the cement and water is mixed the process of hydration occurs forming a paste which then hardens. 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