Effect of seawater for mixing and curing on the compressive strength of concrete with fly ash replacement.

Date

2012

Degree

Bachelor of Science in Civil Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Abstract

This research studied the behavior of the compressive strength of concretes with fly ash (FA) replacement casted and cured on different mixing and curing conditions. Compression test were done on samples containing 10% and 20% FA and results were compared with a control containing 100% ordinary Portland cement after 7, 28, and 90 days of curing. There were five mixing and curing conditions using normal water and 3% NaCI solution. Air curing was also performed. It was found out that the strength of FA concrete mixed or cured with seawater is similar to the control (NN concrete with 0% FA replacement). Air-cured concretes have the least strength. There is a significant increase in strength after 7 days, but, after 28 days, strength development is already negligible. The strength od FA concrete mixed or cured with seawater similar with the control specimen can be attributed to the trapping effect of fly ash. Crystals increase the packing of the structure but further crystallization would cause volume instability, hence, promote damage of the concrete. A well-developed FA concrete structure can only be achieved with longer curing period. Based on the experimental results and statistical analysis of this study, seawater can be used as mixing or curing water with the aid of fly ash.

Language

English

Location

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

Call Number

LG 993.5 2012 E63 O73

Document Type

Thesis

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