COMPRESSIVE STRENGTH OF CONCRETE WITH SEAWATER AND POWDERED EGGSHELLS AS PARTIAL REPLACEMENT FOR CEMENT

Authors

  • Bernardo Lejano
  • Rev Jacob Barron
  • Philip Daniel Saludo
  • Jericho Mari Tugade
  • Ken Yokohama

Keywords:

Cement Replacement, Compressive Strength, Concrete, Eggshells, Seawater

Abstract

In efforts to generate sustainable concrete, alternative mixing constituents are used. In this
study, the use of powdered eggshells as partial cement replacement and seawater as freshwater replacement
were explored. The experiment consisted of two phases. First phase was the investigation of 50-mm mortar
cube specimens to determine the effect on the compressive strength of mortars with 5% cement replacement
with powdered eggshells that were heated at varying temperatures and duration. In the preparation of
powdered eggshells, the heating duration was varied at 3, 6, and 12 hours while the temperature was varied at
100OC and 200OC. Based on the compressive strength test results, it was determined that heating of powdered
eggshells at 100OC for 12 hours achieved the highest compressive strength. Results of Scanning Electronic
Microscope (SEM) showed that there was formation of fiber-like structures for mixes with powdered
eggshell. This is believed to be the cause of increase in strength. For the second phase, the better heating
method of powdered eggshells that was determined from the first phase was adopted and was used as mixing
guide for the cylindrical concrete specimens. The three water-cement ratios used in making the concrete
cylinders were 0.4, 0.5 and 0.6. All water-cement ratios of concrete cylinders cured for 28 days exhibited
increased compressive strength as powdered eggshells were added as partial cement replacement. It was also
determined that the compressive strength further increased when both seawater and powdered eggshells were
utilized in concrete. An increase up to 36.4% was observed.

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Published

2020-05-30

How to Cite

Bernardo Lejano, Rev Jacob Barron, Philip Daniel Saludo, Jericho Mari Tugade, & Ken Yokohama. (2020). COMPRESSIVE STRENGTH OF CONCRETE WITH SEAWATER AND POWDERED EGGSHELLS AS PARTIAL REPLACEMENT FOR CEMENT. GEOMATE Journal, 18(69), 52–58. Retrieved from https://geomatejournal.com/geomate/article/view/1484

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