Hydration Characteristics of Blended Cement Containing Metakaolin
Hagrass, A., Ibrahim, S., El-Hosiny, F., Youssef, S., Moharam, M. (2018). Hydration Characteristics of Blended Cement Containing Metakaolin. EKB Journal Management System, 107(1), 38-51. doi: 10.21608/tims.2018.199446
A. A. Hagrass; S. S. Ibrahim; F. I. El-Hosiny; S. I. Youssef; M. R. Moharam. "Hydration Characteristics of Blended Cement Containing Metakaolin". EKB Journal Management System, 107, 1, 2018, 38-51. doi: 10.21608/tims.2018.199446
Hagrass, A., Ibrahim, S., El-Hosiny, F., Youssef, S., Moharam, M. (2018). 'Hydration Characteristics of Blended Cement Containing Metakaolin', EKB Journal Management System, 107(1), pp. 38-51. doi: 10.21608/tims.2018.199446
Hagrass, A., Ibrahim, S., El-Hosiny, F., Youssef, S., Moharam, M. Hydration Characteristics of Blended Cement Containing Metakaolin. EKB Journal Management System, 2018; 107(1): 38-51. doi: 10.21608/tims.2018.199446

Hydration Characteristics of Blended Cement Containing Metakaolin

The Bulletin Tabbin Institute for Metallurgical Studies (TIMS)
Volume 107, Issue 1, 2018, Page 38-51  XML PDF (1.23 MB)
Document Type: Original research papers
DOI: 10.21608/tims.2018.199446
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Authors
A. A. Hagrass email 1; S. S. Ibrahim2; F. I. El-Hosiny3; S. I. Youssef1; M. R. Moharam4
1Tabbin Institute for Metallurgical Studies, Helwan, Cairo, Egypt.
2Central Metallurgical R&D Institute, Helwan, Cairo, Egypt.
3Faculty of Science, Ain Shams University, Cairo, Egypt.
4Faculty of Engineering, Al-Azhar University, Cairo, Egypt.
Abstract
Meta-kaolin as a pozzolanic active material was prepared by firing kaolin ore at different temperatures ranged from 500-1000°C for different soaking times from 1- 5 hours. Optimization of the preparation study was carried out. The optimum conditions were shown to be at 750°C for 5 hours. Mechanical and physico-chemical characterization of blended cement pastes made by partial replacement of Portland cement (PC) with 0, 5, 10 and 15 wt. % of metakaolin were studied. The pastes were hydrated for various time intervals of 1, 3, 7, 14 and 28 days. At each time interval, the hydrated pastes specimens were tested for compressive strengths, hydration kinetics, differential scanning calorimetry, XRD analysis and scanning electron microscopy. Blended pastes made of 90% OPC + 10% MK showed the highest compressive strength values at all hydration ages. DSC thermograms and XRD diffractograms results showed the formation of nearly amorphous calcium silicate hydrates (mainly as CSH. I & II), calcium sulphoaluminate hydrates (ettringite and monosulphate hydrates), calcium aluminate hydrates, calcium hydroxide (CH) and CaCOR3R. Scanning electron microscopy micrographs indicated the formation of denser microstructure for the hardened OPC- MK pastes as compared to neat OPC pastes after 28 days.
Keywords
Blended Cement; Ordinary Portland Cement; Metakaolin; compressive strengths; hydration kinetics
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