Effect of Calcium Nitrite Inhibitor on Mechanical and Durability Parameters of Concrete

Author(s): Bhaskar Sangoju, Bharatkumar B. H. and Ravindra Gettu
Paper category: Proceedings
Book title: Proceedings of International Conferences (ICACMS) Advances in Construction Materials and systems Vol 2
Editor(s): Manu Santhanam, Ravindra Gettu, Radhakrishna G. Pillai, Sunitha K. Nayar
ISBN: 978-2-35158-194-0
e-ISBN: 978-2-35158-191-9
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 452-460
Total Pages: 9
Language : English

Abstract: This paper discusses the results of laboratory studies on the effect of calcium nitrite inhibitor (CNI) with different dosages (10, 20 and 30 l/m3) on the mechanical and durability parameters of fly ash based Portland pozzolana cement concrete. A water-to-cement ratio of 0.47 was used and different specimens such as cubes, cylinders and prisms as per ASTM G 109 were cast. For determining the effects of chemical admixtures on corrosion of embedded steel in concrete exposed to chloride environments, G 109 test was believed to be more representative of field conditions compared to other accelerated tests. Therefore, G 109 test specimens with different dosages of CNI were cast and exposed to continuous wetting and drying cycles for a period of more than 2 years. Half-cell potential measurements indicate the concrete with CNI did not show any inhibition effect on the occurrence of proneness of corrosion. The current in specimens of concrete with 10 l/m3 of CNI showed large variation whereas the average integrated macrocell current in control specimens is about 4.08 C indicating the test to be continued for still more longer periods to reach the integrated macrocell currents equal to or greater than 150 C. The 28 day compressive strength and RCPT results of concrete with CNI indicate lower compressive strengths (about 11 to 20%) and higher charge passed (about 4 to 42%) when compared to that of control concrete.

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