Possibility of using different types of Egyptian serpentine as fine and coarse aggregates for concrete production
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ORIGINAL ARTICLE
Possibility of using different types of Egyptian serpentine as fine and coarse aggregates for concrete production M. A. Masoud . Alaa M. Rashad
. K. Sakr . M. G. Shahien . A. M. Zayed
Received: 25 December 2019 / Accepted: 1 July 2020 Ó RILEM 2020
Abstract This work is the first attempt to study the possibility of incorporating three different types of Egyptian serpentine aggregates (antigorite, lizardite and chrysotile) with different serpentinization grades as fine and coarse aggregates for normal concrete production. The results of physical and mechanical tests for each type of aggregate were compared to the others. In addition, the effect of serpentinization grade on their mineralogical composition, physico-mechanical and morphological properties of was evaluated and compared. The results were analyzed by using sophisticated tools such as X-ray diffraction, thermogravimetry/differential thermogravimetry and
scanning electron microscopy. The results revealed that the physical, mechanical and microstructural properties of serpentine-based concretes were negatively influenced by the progress of serpentinization and deformation processes. The antigorite aggregate showed the lowest serpentinization grade compared to the others (i.e. lizardite and chrysotile). Thus, the antigorite-based concrete revealed better physical and mechanical properties as well as a condensed interfacial transition zone than those of lizardite- and chrysotile-based. Therefore, the results of this study indicated that antigorite is the most appropriate serpentine aggregate to be used in normal concrete production, however, more tests on the durability of such concrete are needed.
M. A. Masoud M. G. Shahien A. M. Zayed (&) Applied Mineralogy and Water Research Lab, Department of Geology, Faculty of Science, Beni-Suef University, Beni Suef 62521, Egypt e-mail: [email protected]; [email protected]
Keywords Serpentine aggregate Serpentinization grade Concrete Microstructure Mechanical strength Hydration product
A. M. Rashad (&) Building Materials Research and Quality Control Institute, Housing and Building National Research Center (HBRC), Cairo, Egypt e-mail: [email protected]
1 Introduction
A. M. Rashad Civil Engineering Department, College of Engineering, Shaqra University, Riyadh, Saudi Arabia K. Sakr Hot Laboratory Center, Atomic Energy Authority, Cairo 13759, Egypt
Geology is an important science for nominating suitable aggregates necessary to prepare and produce construction materials [1]. Therefore, the knowledge of geological and petrographical characteristics of natural aggregates facilitates the selection of appropriate aggregates with desired physico-chemical and
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mechanical properties for producing concrete with intended characteristics [2, 3]. Generally, the quality of concrete depends on three items: aggregates, cement paste and bonding strength of aggregates to the cement paste via interfacial transitiona
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