PRODUCING CONCRETE OF HIGHER STRENGTH USING FLY ASH AND A GENERIC SULFONATED NAPHTHALENE FORMALDEHYDE CONDENSATE SUPERPLASTICIZER

Chukwunonso U. Chidolue, Boniface O. Adinna (PhD), Chukwurah H. Aginam (PhD)

Abstract


This study investigated the effects of fly ash and Sulfonated Naphthalene Formaldehyde condensate (SNF) on the strength of concrete. A nominal mix of 1:2:4 was used, with the water/cement ratio varied between 0.4, 0.5, and 0.6. Fly ash was kept constant at 8%, while SNF was varied between 0% and 3%. The results showed that the addition of fly ash and SNF increased the compressive strength of concrete. The highest compressive strength was achieved at a water/cement ratio of 0.4, 8% fly ash, and 3% SNF at 28 days curing. 40 N/mm2 is a threshold value for high-strength concrete which is normally tested at 90 days. In conclusion, the study showed that adding fine fly ash and SNF in a normal concrete is an effective way of greatly increasing the expected strength. It was then recommended that they should be used for the purpose and also for high-strength concrete.

 KEYWORDS: Compressive strength, high strength, Sulfonated Naphthalene Formaldehyde condensate (SNF)


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References


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