Limestone is the largest raw materials forcement production

Cement production process, each producing one ton of Portland cement grinding at least 3 tons of materials (including raw materials, fuel, clinker, mixed materials, gypsum), according to statistics, the dry process cement production line grinding operations need to consume power accounts for over 60% of the whole power plant, where raw material grinding accounted for more than 30 percent, accounting for about 3% of the coal mill, cement grinding about 40%. Therefore, a reasonable choice of grinding equipment and processes, optimization of process parameters, the correct operation, control operation system for ensuring product quality, reduce energy consumption is of great significance.

Pozzolanic materials chemically react with calcium hydroxide in the presence of water to form compounds possessing cementitious properties. The pozzolanic reactions are silica reactions in the presence of calcium hydroxide and water to produce calcium silicate hydrates(C-S-H). C-S-H creates a denser microstructure that increases strength, reduces the permeability of concrete and improves its resistance to chemical attack. The partial replacement of ordinary portland cement by pozzolanas are known to improve the resistance of concrete to sulphates.As additives in modern cements pozzolanas improve mechanical strength and provide resistance to physical and chemical weathering. The addition of pozzolanas reduces pore sizes and porosity leading to increased strength. The aim of the study is to investigate experimentally the effects of partial replacement of OPC with pozzolana on the workability and compressive strength of concrete. This study seeks to contribute to efforts to make use of locally available materials in infrastructural development in line with the Ghana Government’s objective of using at least 40% of local building materials in government infrastructural projects.

Crushing the cement production process, most of the raw material to be broken, such as limestone, clay, iron ore and coal. Limestone is the largest amount of raw materials for cement production, the larger the particle size after mining, high hardness, thus crushing the material crushing limestone cement plant occupies a more important position.

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