Effect of Molarity of Sodium Hydroxide and Curing Temperature on the Strength of Geopolymer Concrete Containing Recycled Concrete Aggregate

Author(s): Thulasirajan krishnan and Revathi Purushothaman
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: 70-79
Total Pages: 10
Language : English

Abstract: The present experimental study focuses on the effect of molarity of sodium hydroxide and
curing temperature on the compressive strength of geopolymer concrete containing 100%
natural coarse aggregate (NCA) and 100% recycled concrete aggregate (RCA). Geopolymer
concrete was prepared using Class-F low calcium fly ash, sodium silicate, sodium hydroxide
(NaOH), river sand and coarse aggregate (NCA and RCA). Curing was done in a hot-air oven
with constant heating duration of 24 hours. The specimen was allowed to cool down in the
oven for 24 hours. Afterwards, the compressive strength was obtained. The results are
compared by varying the molar concentration of NaOH and the curing temperature of
geopolymer concrete with natural aggregate (GCNA) and geopolymer concrete with recycled
concrete aggregate (GCRCA). It is noted that for a curing temperature of 60°C, the strength
of GCNA increases from 40 MPa to 72.7 MPa when molarity of NaOH increases from 6 M to
14 M. Whereas in case of GCRCA, the compressive strength increases up to 12 molarity
beyond which it declines. While the curing temperature is maintained at 90°C, both GCNA
and GCRCA have more or less similar strength at all molarities. Hence, it is seen that the
maximum compressive strength of GCRA may be obtained at 12M corresponding to 60°C
and 90°C curing.

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