Investigation on the electrical resistivity of type I and type IP concrete with volcanic pumice as aggregate

Date

2011

Degree

Bachelor of Science in Civil Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Eliseo V. Ana, Jr.

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Abstract

Gradual depletion of stone materials had urged the public to find more eco-friendly source of material in concrete production. This study aims to investigate the electrical resistivity of Type I and Type IP concrete with volcanic pumice (VP) as aggregate. Electrical resistivity is the key indicator of durability of concrete in terms of corrosion. High electrical resistivity indicates high durability of concrete. Direct current (DC) electrical resistivity tests were done on concrete samples, with varying water to binder ratio (w/b) of 0.50, 0.55, 0.60 and 0.65, after 28 days curing. Concrete specimens were exposed to NaCl solution in order to test its resistance to transport chloride ions which are corrosion agents. The electrical resistivity and chloride penetration depths of the concrete specimens, after 7 and 15 days NaCl exposure, were also measured. It was found out that electrical resistivity of VP concrete after curing was higher than that of normal concrete. However after 15 days of NaCl exposure, the VP concrete showed higher depths of chloride penetration than normal concrete. This indicates that the use of VP concrete in harmful environments induces higher corrosion rate. It was also found that Type IP concrete have higher electrical resistivity than Type I concrete because of the higher amount of pozzolans of Type IP cement compared to Type I. It was also discovered that lowering the w/b will result to higher electrical resistivity due to the decrease of free water that may evaporate and produce voids and microcracks within the concrete. Given the above results, it can be concluded that VP concrete may be utilized in harmful environments provided it has low water to binder ratio and Type IP cement is used. The use of VP concrete with Type IP cement and w/b of 0.50 can be recommended since it has the highest electrical resistivity and least chloride penetration depth measured.

Language

English

LC Subject

Concrete--Electric properties, Pumice

Location

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

Call Number

LG 993 2011 E63 D43

Document Type

Thesis

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