Abstract
The effect of incorporating varying percentages of sodium chloride (NaCl) and calcium chloride (CaCl 2) in ordinary Portland cement (OPC) mortar mixes on the free chloride ion content was investigated. After curing for 28 days with different levels of chloride ions, mixes were tested to assess the percentages of chlorides that remain in the pore solutions and those that are chemically bound by the cement hydration products. It was found that a considerable amount of chloride remains in a free form and that NaCl produces higher percentages of free chloride ions than CaCl 2 at all concentrations up to 2% (Cl − ion by mass of cement). NaCl was also found to produce lower pH than CaCl 2. Thus NaCl will present a greater threat in terms of corrosion of reinforcement than CaCl 2.
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