Manufacturing of lightweight aggregates with carbon fiber and mineral wastes |
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| Affiliation: | 1. University of Castilla-La Mancha, Department of Physical Chemistry, Faculty of Environmental Sciences and Biochemistry, Avenida Carlos III, s/n, 45071 Toledo, Spain;2. University of Castilla-La Mancha, Department of Chemical Engineering, School of Civil Engineering, Av. Camilo José Cela, 2, 13071 Ciudad Real, Spain;3. University of Castilla-La Mancha, Department of Physical Chemistry, Faculty of Chemical Sciences and Technology, Av. Camilo José Cela, s/n, 13071 Ciudad Real, Spain;1. Geology Department, Faculty of Science, Ain Shams University, Cairo 11566, Egypt;2. Department of Geosciences, University of Bremen, Klagenfurter Straße, D-28359 Bremen, Germany;3. Ceramic Department, National Research Center, Dokki, Cairo 12622, Egypt;1. Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil Engineering, Shenzhen University, Shenzhen 518060, PR China;2. Department of Civil and Architectural Engineering, City University of Hong Kong, Hong Kong;3. Department of Civil Engineering, COMSATS Institute of Information Technology, Pakistan;4. Department of Architecture, Graduate School of Engineering, The University of Tokyo, Japan;1. Department of Physical Chemistry, School of Environmental Sciences and Biochemistry, University of Castilla-La Mancha, Ave. Carlos III, s/n, 45071 Toledo, Spain;2. Department of Crystallography and Mineralogy, School of Geological Sciences, Complutense University of Madrid, Ciudad Universitaria, 28040 Madrid, Spain |
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| Abstract: | The use of carbon fiber wastes (FC) as a component to manufacture lightweight aggregates (LWAs) for concrete has been studied. Amounts of 0, 2.5, 5 and 10% (w/w) of powdered FC were added into a mineral matrix composed by 90% of granite-marble sludge (COR) plus 10% of sepiolite rejection (SEP). The mixtures were milled, kneaded with water, extruded, shaped into pellets, oven-dried and finally fired at 1100, 1125 and 1150 °C for 4, 8 and 16 min in a rotary kiln. The main technological properties of the sintered aggregates were measured. The addition of FC promoted bloating and the formation of an internal structure in which both pores and unburnt carbon fibers were present. Improvements in lightness and mechanical properties were also observed. This is the first time that carbon fibers have been embedded within aggregates, opening the way to the development of a new type of LWAs for concrete. |
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| Keywords: | Lightweight aggregate Carbon fiber Waste management Ornamental rock Sepiolite Lightweight concrete |
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