Low temperature steam curing hydration of lime-fly-ash compacts

✍ Scribed by A. Marcialis; L. Massidda; U. Sanna

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 390 KB
• Volume: 13
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(83)90090-x

✦ Synopsis

Low pressure steam-curing hydration of mixtures with different fly-ash-to-lime ratios compacted at 50 and 150 MPA was studied. The pastes were cured for between 8 and 72 h at 60 ° , 75 ° and 90oc. For comparative purposes duplicate samples were treated for 28 days at 25oc. Compressive strength tests were perform ed on the hydrated samples and the results obtained compared with those pertaining to combined lime and porosity. Higher lime contents of the anhyd r o u s mixtures correspond to greater amounts of reacted productand enhanced strengths. Higher temperature accelerates the reaction rate and produces an increment in strength, even if moderate in passing from 75 ° to 90°C. This can be attributed to the corresponding increase in porosity of the specimens which contr a s t s with the positive effect produced by the progression of the pozzolanic reaction.