2015 CSCE Annual Conference Regina - Building on our Growth Opportunities

2015 CSCE Annual Conference Regina - Building on our Growth Opportunities Conference


Title
Performance of Metakaolin Concrete


Author(s)
Mr. Amr El Margoushy, the american university in cairo
Mr. Khaled Saad
Mr. Mohamed Hamed, The American University in Cairo
Mr. Mohamed Shaheen, The American University in Cairo
Mr. Mostafa Emam, The american university in cairo
Ms. Minass Asaad, The American University in Cairo
Dr. Mohamed Abou-Zeid, The American University in Cairo (Presenter)
Abstract

With current environmental challenges, studies have been focusing on innovative  sustainable materials that can contribute to good quality concrete. Recently, there has been a growing interest in investigating the use of high-reactivity Metakaolin (MK) as a supplementary cementitious material in concrete. Metakaolin is an ultrafine pozzolanic material produced by calcinating purified kaolinite clay at temperatures ranging from 700 to 900°C and used as is incorporated as a mineral admixture.

This study focuses on studying the performance of concrete incorporating two types of Metakaolin. Thirteen mixtures were prepared using Type I and Type II Portland cement and different w/c ratios. MK was added at dosages of 10, 15 and 25% replacement of Portland cement.  In addition, comparative mixtures were prepared using naturally-formed kaolin. The testing program included slump, air content, compressive strength, flexure strength, rapid chloride permeability tests as well as assessment of bonding, chemical attack and corrosion.

Results reveal that Metakaolin-modified mixtures exhibited higher workability as well as improved compressive and flexure strength tests when compared to conventional mixtures. Furthermore, both metakaolin and kaolin mixtures have demonstrated less permeability; improved bond strength and enhanced corrosion resistance. Further work is recommended to validate the findings of this study and to pinpoint other potential merits of metakaolin.