THE USE OF NON-CHLORIDE BASED ADMIXTURE FOR ENHANCING THE MECHANICAL PROPERTIES OF CONCRETE: A CASE STUDY OF COSTARCEL-200

Daniel E. Ogheneochuko, Victory A. Ndanenu, Favour A. Amalachukwu

Abstract


The use of chemical admixtures has gained popularity in recent times as they help to improve the fresh and hardened properties of concrete. This research investigated the use of a non-chloride admixtures; Costarcel-200 on concrete at certain percentages. Non-Chloride admixtures were added at 1%, 1.2%, 1.4% and 1.5% of the cement weight. Several cubes were cast and tests conducted on the concrete. The fresh concrete tests conducted were workability and wet density tests while the hard concrete tests were dry density tests at 7 and 28 days, compressive strength test at 7 and 28 days and flexural strength test at 28 days. The workability test conducted was slump test which showed that at 1.4% addition of admixtures,  the highest value of slump was obtained. The wet density tests showed that at 1.0% addition of admixtures, the highest wet density was achieved which was 0.9% higher than the control. The 7-day dry density test showed that no significant increase in dry density was achieved with the addition of admixtures to the concrete rather reduction of 2.2% was seen at 1% addition while at 28 days, the highest dry density was achieved at 1.5% addition of admixtures which gave a 1.14% increase as compared with the control. The compressive strength test showed that the 7 days compressive strength gave the highest at 1.4% addition of admixture with 15.66 N/mm2 while the lowest was at 1.2% addition with 12.33 N/mm2 whereas the 28days test results showed that at 1.5% addition of admixture, a compressive strength of 25.66 N/mm2,  a 3.81% increase from the control. The flexural strength test showed that at 1.5% addition of admixture gave the highest flexural strength of 3.9 N/mm2 while the lowest was the control which gave a flexural strength of 2.5 N/mm2. This indicates that a 56% increase in flexural strength is achieved at 1.5% addition of non- chloride admixture as compared with the control.

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KEYWORDS:   density, admixtures, super plasticizers, workability, compressive strength, flexural strength.


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