Influence of Gravel Damage and Mortar Attached on Mechanical Properties of Recycled Aggregate Concrete

Title: Influence of Gravel Damage and Mortar Attached on Mechanical Properties of Recycled Aggregate Concrete
Author(s): Gaifei PENG, Yanzhu HUANG, Jiufeng ZHANG
Paper category : conference
Book title: 2nd International Conference on Waste Engineering and Management - ICWEM 2010
Editor(s): J.Zh. Xiao, Y. Zhang, M.S. Cheung and Reuben P. K. Chu
Print-ISBN: 978-2-35158-102-5
e-ISBN: 978-2-35158-103-2
Publisher: RILEM Publications SARL
Publication year: 2010
Pages: 466 - 474
Total Pages: 9
Nb references: 10
Language: English

Abstract: This paper presents an experimental research on the influence of gravel damage and mortar attached on mechanical properties of recycled aggregate concrete (RAC). Concretes at two water/binder ratios (0.255 and 0.586) were broken into recycled aggregates (RA). A type of thermal treatment was employed to remove mortar in RA. Tests were conducted on aggregate to measure water absorption and crushed values, and on RAC and natural aggregate concrete (NAC) to measure compressive strength, tensile splitting strength, and fracture energy. The results revealed that both gravel damage and mortar attached can significantly influence the water absorption and crushed value of RA. The mechanical properties RAC were obviously lower than those of NAC at an identical mix proportion. Moreover the removal of mortar caused a decrease in mechanical properties in the case of low water/binder ratio, but caused an increase in mechanical properties in the case of high water/binder ratio. As to RAC at a low water/binder ratio, gravel damage was a main factor governing the decrease in fracture energy. However, as to RAC at a high water/binder ratio, mortar attached could significantly cause a greater decrease in cracking resistance of RAC than that caused by gravel damage.

Online publication: 2011-01-25
Publication type : full_text
Public price (Euros): 0.00