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The effect of chloride ion source on the free chloride ion percentages in OPC mortars

✍ Scribed by M.J. Al-Hussaini; C.M. Sangha; B.A. Plunkett; P.J. Walden

Publisher: Elsevier Science
Year: 1990
Tongue: English
Weight: 351 KB
Volume: 20
Category: Article
ISSN: 0008-8846
DOI: 10.1016/0008-8846(90)90007-k

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✦ Synopsis

The effect of incorporating varying percentages of sodium chloride (NaCI) and calcium chloride (CaC12) 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 NaCI produces higher percentages of free chloride ions than CaCI2 at all concenm'ations up to 2% (C1-ion by mass of cement). NaC1 was also found to produce lower pH than CaCI2. Thus NaCI will present a greater threat in terms of corrosion of reinforcement than CaCI2.

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