Pore solution composition and reinforcement corrosion characteristics of microsilica blended cement concrete

✍ Scribed by Rasheeduzzafar; S. Ehtesham Hussain; A.S. Al-Gahtani

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 848 KB
• Volume: 21
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(91)90064-o

✦ Synopsis

Plain and microsilica blended cement pastes with water-cement ratio of 0.6 were prepared using a 14% C aA cement. Two levels of chloride from NaC1 corresponding to 0.6% and 1.2% by weight of cement were added through mix water. The pastes were allowed to hydrate in sealed containers for 180 days and then subjected to pore solution expression. The expressed pore fluids were analyzed for chloride and hydroxyl ion concentrations. The results show that the OH ion concentration in the pore solutions of both chloride-free and chloride-bearing pastes drop steeply with increasing cement replacement by microsilica. For 10% microsilica cement pastes the pH for both 0.6% and 1.2% chloride addition was found to be around 13.30. However, the pH drops to a level below that of saturated Ca(OH)2 solution when cement replacement by