Effect of water- cement on the electrical resistivity of type l and type lP cement mortar.

Date

2012

Degree

Bachelor of Science in Civil Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Abstract

This study investigated the behavior of electrical resistivity of mortar with different water-cement (w/c) ratios. Electrical resistivity, a durability parameter. indicates the ability of a material to resist the flow of electric current. High electrical resistivity means high durability of mortar. Direct Current Electrical Resistivity Tests were conducted on mortar with four different w/c ratios (0.50, 0.55, 0.60 and 0.65). Also two types of cement (Type I and Type IP) were used. After 28 days of curing, initial resistivities of the specimens were measured. Then, their resistivities were determined after chloride exposure. It showed that as w/c ratio decreases, electrical resistivity increases chloride exposure. It showed that as w/c ratio decreases, electrical resistivity increases. Evaporable water in the system supports the migration of charges since water contains ions. Furthermore, water dictates the amount of pores which also contributes to the flow of charges. Comparing the cement types, Type IP cement mortar had higher resistivity for each chloride exposure conditions due to improve pore structure in the interfacial transition zone. The pozzolan in Type IP cement consumes calcium hydroxide and produces calcium silicate hydrate which is less porous. Since pores are reduced, the flow of current is less efficient resulting to higher resistivity. Moreover, colorimetric test was done and the results were consistent with the electrical resistivity data.

Language

English

Location

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

Call Number

LG 993.5 2012 E63 M36

Document Type

Thesis

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