Investigation of the chloride ingress in submerged Type I and Type IP cement mortar specimens using colorimetric method

Date

10-2011

Degree

Bachelor of Science in Civil Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Abstract

Chloride attack constitutes 90% among the different types of deterioration in marine structures. Chloride ingress investigations are significant to redude the corrosion risks and costs spent on the repair and rehabilitation of these structures. The study investigated on the chloride ingress in submerged Type IP cement mortar specimens using colorimetric method. Two types of cement ( Type I and Type IP), three different water-to-cement(w/c) ratios (0.55, 0.6, and 0.65), two different curing periods (7days and 28 days) and two different exposure periods (30 days and 60 days) were considered. Chloride (CI) penetration depths were determined through colorimetric test considering four different parameters: type of cement, curing period, w/c and submersion period. It was found out that Type IP cementhas higher CI penetration resistance thn Type I cement. Longer curing periods also decreased CI penetration. The effect on both parameters was due to the pozzolanic reaction, hydration f cement, and additional formation of C-S-H (calcium silicate hydrate) which led to a reduction of mortar porosity and CI penetration. On the other hand, highew/c and longer exposure periods were found to increase CI penetration. This was due to the formation of bigger ores as w/c increases and also opened pathways for chloride transport. The study concluded the Type IP cement mortar exhibited a stronger CI penetration resistance than Type I cement mortar, especially at lower w/c and longer curing period.

Language

English

Location

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

Call Number

LG 993 2011 E63 /T75

Document Type

Thesis

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