Influence of the type of calcium sulfate on the strength and hydration of portland cement under an initial steam-curing condition

✍ Scribed by Hong Zhang; Zhongsou Lin; Damao Tong

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 420 KB
• Volume: 26
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(96)00149-4

✦ Synopsis

The influence of gypsum (G) and anhydrite (A) on the strength and hydration of ordinary Portland cement (OPC) has been investigated. Under an initial steam-curing condition (65°C x 4 h), optimum SO3 contents of both samples were found rising to 4-5% SO3 and a higher optimum strength was gained with anhydrite as the retarder. Tests show that compared with Sample G, Sample A has higher non-evaporable water content, higher Ca(OHh content, less pore volume and lower average pore diameter. Pore solution analyses show that it's the higher [S04'-] and lower [OH-] concentrations in Sample A that result in the above differences.