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134. Mechanical properties of self-compaction concrete using recycled material from demolished concrete structure as aggregate and powder



Title: 134. Mechanical properties of self-compaction concrete using recycled material from demolished concrete structure as aggregate and powder
Author(s): K. Nishikawa, H. Mizuguchi, C. Hashimoto, H. Tsutsui
Paper category : conference
Book title: 5th International RILEM Symposium on Self-Compacting Concrete
Editor(s): G. De Schutter and V. Boel
Print-ISBN: 978-2-35158-047-9
e-ISBN: 978-2-35158-088-2
Publisher: RILEM Publications SARL
Publication year: 2007
Pages: 887 - 892
Total Pages: 6
Nb references: 5
Language: English


Abstract: In Japan, a great many concrete structure was constructed in 1950's and these structures are demolished now. It is estimated that these will increase more and more in the future. All most of these demolished concrete is recycled, and it is used as aggregate for concrete, roadbed materials or backfill as regenerated materials. However, the using amount of aggregate for concrete is very small. It is very difficult to use for normal concrete as aggregate, because this regenerated materials, in general, is including much fine particle of 0.15mm under up to 40%.
Therefore, the purpose of this study is developed a powder-type self-compaction concrete using all of recycled materials from demolished concrete. Because powder-type self-compaction concrete is used much fines. At the first, it is investigated that the mix proportion of self-compaction concrete having 65±5cm of slump flow using three types of cement. Three self-compaction concretes were used just all of recycled material as powder, fine and coarse aggregate with the same ratio of the recycled material from a demolished concrete structure.
The mechanical properties of these concrete such as compressive strength, dynamic modulus of elasticity, shrinkage and resistance for freezing and thawing, were investigated. As the results, the compressive strength of three concretes are bigger than the specified value of Japanese Architectural Standard Specification(JASS5) for self-compaction concrete. However the shrinkaging change of three concretes are bigger than the specified value of JASS5. Then, it was examined the different mixtures that were used an expanding agent or a shrinkage reduction agent to reduce shrinkage. As the result, it was obtained the smaller shrinkage of self-compaction concrete compared with the concrete without these agents.


Online publication: 2009-06-16
Publication type : full_text
Public price (Euros): 0.00