Effect of Mineral Admixtures on Carbonation of Seawater Mixed Concrete

Adiwijaya, Ali and Hamada, Hidenori and Sagawa, Yasutaka and Yamamoto, Daisuke (2015) Effect of Mineral Admixtures on Carbonation of Seawater Mixed Concrete. In: The 2nd Makassar International Conference on Civil Engineering 2015, 11st - 12nd August 2015, Makassar-Indonesia.

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Official URL: http://eng.unhas.ac.id/id/news/11-The-2nd-Makassar...

Abstract

This study presents carbonation of seawater mixed concrete and tap water mixed concrete incorporating mineral admixtures such as Fly Ash (FA) and Ground Granulated Blast-Furnace Slag (GGBS) with W/B of 40%, 50% and 60% in tap water curing (TC), seawater curing (SC) and air curing (AC). The effect of seawater mixing, mineral admixtures, water-binder ratio, curing conditions and exposure condition on carbonation process of concrete were evaluated. Concrete prism specimens using tap water and seawater as mixing water were prepared. At 24 hours after casting, specimens were de-molded and followed by distinct curing conditions such as tap water curing, seawater curing and air curing. After curing until 28 days, specimens were exposed in air during 4 weeks before they were brought into accelerated chamber for carbonation and natural outdoor exposure. Based on experimental result, it was shown that carbonation depth of seawater-mixed concrete with and without mineral admixtures in AC was lower compared to tap water mixed concrete in both accelerated and natural exposure carbonation. Moreover, mineral admixtures increased carbonation rate of seawater mixed concrete in all curing condition. Besides, the carbonation rate of seawater-mixed concrete with and without mineral admixtures in SC was smaller than that of in TC. In addition, accelerated carbonation depth of seawater mixed or tap water mixed FA and GGBS concrete was seven times larger than natural exposure carbonation. Keywords: Seawater mixing, carbonation, mineral admixture, curing condition, exposure condition

Item Type: Conference or Workshop Item (Paper)
Subjects: T Technology > TH Building construction
Depositing User: Dr.Eng. Adiwijaya, S.ST., M.T.
Date Deposited: 07 Apr 2018 14:13
Last Modified: 16 Apr 2018 06:11
URI: http://repository.poliupg.ac.id/id/eprint/643

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