Factors influencing chloride-binding in concrete

✍ Scribed by C. Arya; N.R. Buenfeld; J.B. Newman

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 442 KB
• Volume: 20
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(90)90083-a

✦ Synopsis

Chloride binding in concrete has been investigated by analysing pore solution expressed from cement paste specimens using a pore press.

For chlorides introduced at the time of mixing, cement type, the type and proportion of cement replacement material, the chloride salt and total chloride content were found to be the most important factors governing binding.

Binding also increased with increases in water/cement ratio, curing temperature and age.

Similar, though less pronounced, trends were observed when chlorides were introduced externally by immersing thin discs of hardened, but relatively immature, cement paste, although SRPC gave ~imiiAr results to OPC.

Water/cement ratio and curing time prior to immersion had little effect, but the level of binding increased with exposure time and chloride concentration of the external solution.

Solutions of calcium chloride, and particularly magnesium chloride, produced far higher levels of binding than sodium chloride.