Influence of curing time on the electrical resistivity of type 1 cement concrete containing 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. Richelle G. Zafra

Abstract

The study investigated the influence of the curing time on the electrical resistivity behavior of concrete produced with constant percent crystalline RHA replacement of 15%, w/c of 0.55 and s/a of 0.53. Two sets of specimens were made. After curing, the first set was submerged under simulated 3% NaCI solution at the laboratory while the other set was brought to Batangas for actual marine environment exposure. Curing periods were set to 7,28, and 56 days. Electrical resistivity is a measure of the passage of current through a material. A highly electrical resistive concrete has high resistance to corrosion, thereby more durable. The values obtained from the measurement of electrical resistivity were done using the DC electrical resistivity test. This was done after submerging all the specimens in NaCI solution after 60 days. The results proved that there was a reduction in Coulomb charges when longer curing period were applied to all the mixes. There was a positive correlation between the amount of time specimens were cured and their resistance to electricity. Specimens cured for 7 days showed the weakest resistance to electricity while those exposed for 56 days exhibited the strongest. Therefore, the effect of crystalline RHA as a pozzolan is evident at a longer period of curing (e.g. 56 days). Thus incorporation of RHA with longer curing period will produce more durable concrete as opposed to using concrete with Type I cement. Furthermore, the difference between the two submersion environment (actual and simulated NaCI solution set-up) caused an insignificant change in the trend of the results for electrical resistivity test.

Language

English

Location

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

Call Number

LG 993.5 2013 E63 M33

Document Type

Thesis

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