Effect of varying water-to- binder ratio on electrical resistivity of Type IP cement concrete with crystalline Rice Husk Ash as supplementary cementing material.

Date

4-2013

Degree

Bachelor of Science in Civil Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Joseph M. Caburnay

Committee Member

Eliseo V. Ana Jr.

Abstract

This study investigated the behavior of the direct current electrical resistivity of concrete mixes with the addition of crystalline rice husk ash (RHA) and with variation of water-to-binder ratios (0.5, 0.55, and 0.6). Electrical resistivity, a key durability parameter of concrete, is the resistance of a material to channel of electric current. When concrete is highly resistive to electric current, it shows the concrete's high durability. Electrical resistivity test was done on concrete samples containing 5%, 10%, 15%, and 20% RIM (by mass of total binding material). The results were then compared to the controlled mix containing 100% Type IP Portland cement. All electrical resistivity tests were done after the concrete samples were cured for 28 days and after the samples were submerged to NaCI solution for 30 days. It was found out that after 28 days curing, the electrical resistivities of concrete specimens increased as the replacement level of RHA increased. Also, the electrical resistivities of the specimens, with or without RHA, decreased as the w/b ratio increased. Moreover, the electrical resistivities of the specimens, before and after submersion to Nita solution, acquired a similar trend. However, lower electrical resistivities were observed after exposing the specimens to saline environment. Statistical analysis confirmed that the interaction between RIM replacement level and w/b ratio was significant. This indicated that any change on RHA replacement level and/ or w/b ratio would significantly affect the electrical resistivity of the specimens. The best combination was the mixture of 0.50 w/b ratio with 20% RHA and the least effective was the mixture of 0.60 w/b ratio with 0% RHA.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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