Effect of activated coal mining wastes on the properties of blended cement |
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| Authors: | M Frías MI Sanchez de Rojas R García A Juan Valdés C Medina |
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| Affiliation: | 1. Eduardo Torroja Institute (CSIC), 28033 Madrid, Spain;2. Dpto de Geología y Geoquímica, Unidad Asociada CSIC–UAM, Universidad Autónoma de Madrid, 28049 Madrid, Spain;3. Dpto de Ingeniería y Ciencias Agrarias, Universidad de León, Spain;1. Centro de Investigación para la Ingenieria en Mineria Sostenible (CIPIMS), Escuela Tecnica Superior de Ingenieria, Universidad de Huelva, Ctra. Palos Fra. s/n, 21819 Palos de la Frontera, Huelva, Spain;2. Centro de Investigação Geológica, Ordenamento e Valorização de Recursos (CIG-R), Departamento de Ciências da Terra, Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal;1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;3. School of Engineering and Computer Science, University of the Pacific, Stockton, CA 95211, USA;4. School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;1. School of Civil Engineering, Central South University, Changsha, Hunan, 410075, China;2. Center for Green Technology, School of Civil & Environmental Engineering, University of Technology Sydney, NSW, 2007, Australia;3. Xi''an Railway Survey and Design Institute Co, Ltd., Xi''an, Shaanxi, 710054, China;1. Tecnalia, Parque Tecnológico de Bizkaia, 28160 Derio, Spain;2. Eduardo Torroja Institute for Construction Science (CSIC), 28033 Madrid, Spain;1. College of Land Science and Technology, China University of Geosciences, 29 Xueyuanlu, Haidian District, 100083 Beijing, People''s Republic of China;2. Key Laboratory of Land Consolidation and Rehabilitation, Ministry of Land and Resources, 100035 Beijing, People''s Republic of China |
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| Abstract: | The large volumes of coal waste generated world-wide in mining operations are mostly deposited in refuse dumps, to the severe detriment of the surrounding groundwater and soil. After calcination under controlled conditions, this waste has been shown to exhibit high pozzolanicity, making it apt for use as an addition in the manufacture of blended cements.The present paper describes the first detailed study designed to evaluate the behavior of coal tailings from different sources. After activation at 650 °C for 2 h, this waste was used to manufacture blended cements containing 10 and 20 wt.% of the addition. Inclusion of this pozzolan did not affect the initial setting time, although the compressive strength of the blended mortars declined, by 4.7–8.3% in the 10% and by 9.76–14.9% in the 20% material. Nonetheless, the activated carbon waste (ACW) blends complied with all the requirements for Type II/A cement in the existing European legislation. |
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