The effectiveness of supplementary cementing materials in suppressing expansion due to ASR: Another look at the reaction mechanisms part 2: Pore solution chemistry

✍ Scribed by J. Duchesne; M.A. Bérubé

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 598 KB
• Volume: 24
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(94)90047-7

✦ Synopsis

Pore solution chemistry (high pressure extraction method) of cement pastes made with two condensed silica fumes, three pulverized fly ashes and one ground granulated blast furnace slag was measured after 7, 28, 84, 182, 364 and 545 days of curing (38°C and 100% R.H.). Results were compared to expansions obtained for a 2 year time period in the CAN/CSA A23.2-14A Concrete Prism Method for concrete specimens made with two very alkali-silica reactive aggregates and tested at the same conditions and water/cement/SCM. A long-term threshold in alkali hydroxide concentration was observed around 0.65N, below which no significant expansion occurred in corresponding concretes. The lower the SCM alkali content and the concrete alkali content as well, and the higher the SCM content, the easier this limit is satisfied. 222