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The effect of wollastonite powder with pozzolan micro silica in conventional concrete containing recycled aggregate

Authors: 

Du Dinh-Cong, Mohammad. H Keykhosravi, Rayed Alyousef, Musab N A Salih, Hoang Nguyen, Hisham Alabduljabbar, Abdulaziz Alaskar, Fahed Alrshoudi, Shek Poi-Ngian

Source title: 
Smart Structures and Systems, 24(4): 541-552, 2019 (ISI)
Academic year of acceptance: 
2019-2020
Abstract: 

Construction development and greenhouse gas emissions have globally required a strategic management to take some steps to stain and maintain the environment. Nowadays, recycled aggregates, in particular ceramic waste, have been widely used in concrete structures due to the economic and environmentally friendly solution, requiring the knowledge of recycled concrete. Also, one of the materials used as a substitute for concrete cement is wollastonite mineral to decrease carbon dioxide (CO2) from the cement production process by reducing the concrete consumption in concrete. The purpose of this study is to investigate the effect of wollastonite on the mechanical properties and durability of conventional composite concrete, containing recycled aggregates such as compressive strength, tensile strength (Brazilian test), and durability to acidic environment. On the other hand, in order to determine the strength and durability of the concrete, 5 mixing designs including different wollastonite values and recovered aggregates including constant values have been compared to the water - cement ratio (w/c) constant in all designs. The experimental results have shown that design 5 (containing 40% wollastonite) shows only 6.1% decrease in compressive strength and 4.9% decrease in tensile strength compared to the control plane. Consequently, the use of wollastonite powder to the manufacturing of conventional structural concrete containing recycled ceramic aggregates, in addition to improving some of the properties of concrete are environmentally friendly solutions, providing natural recycling of materials.