Effect of using sea water as mixing and curing water on the corrosion of steel bar in concrete with varying amount of fly ash.

Date

10-2012

Degree

Bachelor of Science in Civil Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Tirazona, Sunseehray Alessandra B.

Committee Member

Madlangbayan, Marish P.

Abstract

This study investigated the effect of using sea water as mixing and curing water of concrete on the corrosion rate of reinforcements in concretes having different fly ash content. Fly ash levels used were 0%, 10%, 20% and 30% by weight of cement. Concrete specimens with water-cement ratio of 0.55 were casted from a 100 mm- diameter by 200 mm-high concrete moulds and were cured in sea water for 28 days. Twelve concrete specimens were mixed normally with purified water (nw/sw) while 12 specimens were mixed using sea water (sw/sw). Sea water used in this study was simulated using 3% NaCl solution. Each concrete specimen was embedded with a 12 mm diameter, 100 mm long steel bars. Corrosion rates of steels were determined using Weight Loss Analysis (ASTM G1-90 1990 E1). Results showed that corrosion rates of steels sw/sw concretes are significantly higher (p< 0.05) than in nw/sw. Results showed that corrosion rates decreased as amount of fly ash in the mix is increased. Thus, it can be deduced that there is a potential for producing green concrete using sea water as ingredient in the mix as long as fly ash is added to reduce corrosion in the steel reinforcement.

Language

English

Location

UPLB College of Engineering and Agro-Industrial Technology

Call Number

LG 993.5 2012 E63 /P53

Document Type

Thesis

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