Deflections and cracks in recycled coarse aggregate concrete members processed by decompression and rapid release

Title: Deflections and cracks in recycled coarse aggregate concrete members processed by decompression and rapid release
Author(s): K. Imamoto
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: 171 - 177
Total Pages: 7
Nb references: 1
Language: English

Abstract: The quality of concrete made from recycled aggregate is generally lower than that of concrete made from virgin aggregate. The main reason for this is that recycled aggregate with its higher water absorption capacity has a porous mortar matrix around the virgin aggregate and hence develops an inferior bond. In this paper we address this problem by proposing an innovative method to improve the quality of recycled aggregate concrete.High quality recycled aggregate concrete (HiRAC) can be obtained through a decompression and rapid release (DC-RR) procedure applied after normal mixing of concrete with recycled aggregate[1]. Through this procedure, the quality of the transition zone between the aggregate and cement matrices can be dramatically improved.
In this paper, experimental and analytical studies are described on the effectiveness of the DC-RR procedure on some of the mechanical and physical properties of recycled aggregate concrete. Full-scale specimens which simulate columns and slabs were constructed and the core compressive strengths and deflections were tested. It was found that the DC-RR procedure increased the core compressive strength and decreased the deflection of slabs made from recycled coarse aggregate concrete.

Online publication: 2004-11-24
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143640.020