Macrocell corrosion behavior of reinforcement in mortar mixed and cured with seawater

Date of Publication

2017

Document Type

Bachelor's Thesis

Degree Name

Bachelor of Science in Civil Engineering with Spec in Construction Technology & Management

Subject Categories

Civil Engineering

College

Gokongwei College of Engineering

Department/Unit

Civil Engineering

Thesis Adviser

heryl Lyne C. Roxas

Defense Panel Chair

Richard De Jesus

Defense Panel Member

Joseph P. Juanzon

Ronald S. Gallardo

Abstract/Summary

This paper tackled the idea of using seawater as a possible alternative to fresh water as main components of mortar. Using two different types of cement OPC and rapid set cement as basis to see how steel reinforcement would react to fresh water compared to seawater. Macro cell corrosion is when corrosion occurs to two adjacent steel bars. This study was conducted to analyze whether using seawater is a feasible component to mortar and if it has a big impact to the progrresion of macro cell corrosion on steel bar. It was also an objective of this study to relate the compressive strength of the mortar to the rate of corrosion of the steel bar and analyze how steel and mortar would react to components of seawater. The compressive strength was monitored in a span of 3 months using a zero resistance ammeter.

The experimental results showed that seawater accelerated the progress of compressive strength due to presence of calcium chloride thus developing the higher compressive strength on a 28-day period compared to mortar mix and cured with seawater. On the other hand, seawater also accelerated the occurrence of corrosion more so with the presence of cold joint where mortar had more voids where seawater seeped in while being cured. The development of corrosion when seawater was used skyrocketed as seen in the 2-month period.

Abstract Format

html

Language

English

Format

Print

Accession Number

TU21968

Shelf Location

Archives, The Learning Commons, 12F, Henry Sy Sr. Hall

Physical Description

85 leaves : illustrations (some color) ; 30 cm.

Keywords

Building materials; Mortar; Cement; Seawater

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