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Basic study on recovery technique of unhydrated cement grains from waste fresh concrete



Title: Basic study on recovery technique of unhydrated cement grains from waste fresh concrete
Author(s): R. Sakurada
Paper category : conference
Book title: RILEM International Symposium on Environment-Conscious Materials and Systems for Sustainable Development
Editor(s): N. Kashino and Y. Ohama
Print-ISBN: 2-912143-55-1
e-ISBN: 2912143640
Publisher: RILEM Publications SARL
Publication year: 2004
Pages: 119 - 126
Total Pages: 8
Nb references: 3
Language: English


Abstract: This study proposes separation techniques of unhydrated cement grains from waste fresh concrete: freeze-drying method and oven-drying method. These methods enable one to reuse the recovered cement as cementitious admixtures of concrete. The hydration reaction can sufficiently take place again by adding batch water to the recovered cement powders. The cement paste of recovered cement can produce the compressive strength 92-87% against the corresponding strength of reference cement paste using ordinary Portland cement for w/c of 0.3. The use of retarding admixture to the cement paste before freezing or oven-drying results in significantly higher strength compared with the cement paste without retarding admixture.


Online publication: 2004-11-24
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143640.014