The Full Utilization of Recycled Concrete Aggregates Produced Using the Microwave Beneficiation Technique in Combination with Carbon Sequestration

Author(s): Ashokreddy Annapareddy, Lin Jie and K. C. Gary Ong
Paper category: Proceedings
Book title: Proceedings of the 71st RILEM Annual Week & ICACMS 2017,Chennai,India, 3rd -8th September 2017
Editor(s): Manu Santhanam
Ravindra Gettu
Radhakrishna G. Pillai
Sunitha K. Nayar
ISBN: 978-2-35158-196-4
ISBN: 978-2-35158-190-2 (Set)
e-ISBN: 978-2-35158-191-9:
Publisher: Published by RILEM Publications S.A.R.L.
Publication year: 2017
Pages: 330-337
Total Pages: 8
Language : English

Abstract: The global shortage of good quality natural aggregates (NA) has led to an increase in demand
for alternative sustainable sources of aggregates. One such source is via recycling of concrete waste. However, currently produced recycled concrete aggregates (RCA) are usually of low
quality and generally not considered suitable for use in structural concrete. The presence of
the mortar adhering to the RCA particles and impurities are identified as the major factors
affecting the quality of RCA when compared to NA. Various methods have been developed
to deal with the mortar adhering to the RCA, most of which are uneconomical and time and
energy consuming. In addition, almost all the methods concentrate only on the coarse RCA,
completely neglecting the accompanying fines that are also produced. Using microwave
beneficiation combined with carbon sequestration has the potential to fully utilize both the
fine and coarse components of RCA produced. The microwave beneficiation technique
improves the yield and quality of the RCA produced, while carbon sequestration renders the
residual RCA fines chemically inert, which is one of the major advantages of NA. The effects
of the water-cement ratio and the size of the coarse aggregates on the microwave
beneficiation method coupled with carbon sequestration is investigated in this paper.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00