Effect of curing on corrosion of steel bars in type l and type lP cement mortars subjected to accelerated short-term technique using weight loss analysis.

Date

4-2012

Degree

Bachelor of Science in Civil Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Ginghis B. Maranan

Abstract

The study investigated the effect of curing to corrosion rates of steel bars (12mm in diameter) in Type I and Type IP cement mortars subjected to cycling wetting and drying conditions. Weight loss analysis was done on cement mortars (4 in by 8 in) after the fifth cycle of accelerated short-term technique. The study used water-to-cement ratio of 0.55 and curing periods of 3 days, 38 days and 56 days. Two-way ANOVA and multiple comparisons were used to compare variables. In Type I mortars, corrosion rate decreased with increasing curing days. This can be explained by its C₃S content which is responsible for early development of its microstructure and for chloride binding of cement which decrease ion diffusion and permeability within mortar. Based on statistical analysis corrosion rate of 28 days is not significantly different with that of 56 days, therefore, 28 days is enough to cure Type I cement. In Type IP mortars, corrosion rates decreased only on the 26th day of curing. This is because its fly ash content, which retards rate of hydration, therefore development of microstructure is delayed. However, corrosion rate in 56 days decreased significantly. Therefore, Type IP cement must be cured for approximately 56 days.

Language

English

Location

UPLB College of Engineering and Agro-Industrial Technology (CEAT)

Call Number

LG 993.5 2012 E63 /S86

Document Type

Thesis

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