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Unformatted text preview: cementitious properties. This secondary reaction as a result of pozzolanic reaction increases the volume of CSH at the expense of CH. Also CSH formed is denser than that formed due to the hydration of ordinary Portland cements. This means that pozzolanic materials can exhibit secondary reaction on hydration resulting in concrete having higher strength, greatly reduced permeability, potentially greater durability, and better appearance in many environments than plain Portland cement concrete. The presence of CH can also cause efflorescence and this is reduced in concrete containing pozzolanic materials. The pozzolanic reaction is rather slow and requires the presence of moisture in concrete, which includes both mixing, and to a lesser extent curing water. 2.3 Different types of Pozzolonas 2.3.1 Fly ash 18.104.22.168 General...
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- Spring '11
- Portland cement, pozzolanic reaction