Effect of Surface Protection on Carbonation Induced Corrosion in Reinforced Foamed Concrete

Author(s): Marlin S. Mubatapasango and Algurnon S. van Rooyen
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: 204-213
Total Pages: 10
Language : English

Abstract: Surface protection has been used in reinforced concrete to improve durability properties such
as carbonation and chloride resistance. The application of existing surface protection
admixtures in reinforced lightweight foam concrete (RLWFC), a cellular material, their
influence on pore structure and effectiveness against carbonation have not been investigated.
However, RLWFC as a vesicular material require more research on the susceptibility to
carbonation. RLWFC samples were exposed to carbon dioxide concentrations for 13 weeks at
constant temperature and humidity. The RLWFC consisted of 3 groups, that is, non-integral
pore-lining surface treatment, integral pore-blocking treatment and a control batch. The
progression of the carbonation front depth and the corrosion potential were tested periodically.
Penetration depths of the pore-lining treatment were 50 % less than the product specifications
while integral pore-blocking treatment reduced the porosity by 20 %. The control specimens
exhibited low carbonation resistance and showed high corrosion susceptibility. The pore-liner
surface protected LWFC reduced carbonation depths by 30 % and a noticeable positive effect
on corrosion susceptibility. Lastly, the integral surface protected samples exhibited the highest
carbonation resistance with a 55 % reduction in carbonation depths and significant protection
against reinforcement corrosion.

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