The effect of additions of alkaline-earth metal chlorides on the setting behavior of a refractory calcium aluminate cement

✍ Scribed by MR Nilforoushan; JH Sharp

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 886 KB
• Volume: 25
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(95)00146-4

✦ Synopsis

The literature concerned with the effect of alkaline and alkaline-earth metal chlorides on the hydration of calcium aluminate cements is confused. For example, some authors have suggested that magnesium chloride acts as a retarder, while others stated that it acts as an accelerator.

Accordingly a thorough investigation has been carried out into the setting behaviour and early hydration of Secar 71, mixed with a range of concentrations of MgC12, CaC12, SrC12, and BaC12. At 12°C all chlorides brought about retardation of the setting time of the cement, which increased with increasing concentration of the admixture. At 2O"C, at low concentrations they brought about acceleration of the set, but acted as retarders at higher concentrations. At 28°C and 36'C, retardation was observed and its extent increased with increasing concentration of the admixture.