Effect of water-cement on the electrical resistivity of type l type lP cement-concrete

Date

2012

Degree

Bachelor of Science in Civil Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

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Abstract

This study investigated the effect of water-cement ratio and cement type to the behavior of the electrical resistivity of concrete. Electrical resistivity is a key durability parameter of concrete. It is the resistance of a material to the passage of electric current-high electrical resistivity indicates high durability of concrete. Electrical resistivity tets were done on concrete samples with 0.50, 0.55, 0.60 and 0.65 water-cement ratio. Electrical resistivity were determined after the concrete samples were cured for 28 days in distilled water bath, then after 30 days and 60 days of immersion to 3% Sodium Chloride (NaCI) solution, respectively. The study concludes that water-cement ratio is inversely proportional to electrical resistivity and Type IP cement has higher electrical resistivity than Type I cement. higher water-cement ratio leads top a less durable concrete due to the evaporable water that increases voids and spaces that allows presence of ions that are essential to the passage of electric current. Type IP cement concretes have higher electrical resistivity since it contains pozollans. Pozollanic reaction converts calcium hydroxide (C-H) to a less porous product known as calcium silicate hydrate (C-S-H). Also, as chloride exposure condition continues to 60 days, the concrete continued to degrade as dictated with the decreasing value od electrical resistivity. Moreover, a colorimetric test was done on selected specimens and test results had validated the electrical resistivity data.

Language

English

Location

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

Call Number

LG 993.5 2012 E63 D45

Document Type

Thesis

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