An investigation on the recycling of hydrated cement from concrete demolition waste |
| |
| Affiliation: | 1. Buzzi Unicem S.p.A., Via Luigi Buzzi 6, 15033 Casale Monferrato, Alessandria, Italy;2. Science and Technological Innovation Department, University of Piemonte Orientale, Viale T. Michel 11, 15121 Alessandria, Italy;1. School of Engineering, UEX-CSIC Partnering Unit, University of Extremadura, Avda. De la Universidad, s/n, 10071 Cáceres, Spain;2. School of Engineering, University of the West of Scotland, Paisley Campus, Paisley PA1 2BE, United Kingdom;3. “Eduardo Torroja” Institute for Construction Sciences, C/Serrano Galvache, 4, 28033 Madrid, Spain;1. Department of Civil and Environmental Engineering, University of Pittsburgh, PA 15261, USA;2. Shanghai Research Institute of Building Science, 200032, China;3. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, 430072, China;4. Dujiangyan Recycled Construction Material Company, China;1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;2. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;3. School of Science, Wuhan University of Technology, Wuhan 430070, China;1. Department of Architecture and Ocean Space, Korea Maritime and Ocean University, Republic of Korea;2. Department of Architecture, Dong-A University, Republic of Korea;3. Research Institute of Industrial Science and Technology, Republic of Korea;1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;2. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;3. School of Science, Wuhan University of Technology, Wuhan 430070, China |
| |
| Abstract: | Construction and demolition waste (CDW) recycling is generally limited to the use of the coarser fraction as aggregate for new concrete. The recovery of fine aggregates requires a cleaning by removing the hydrated cement waste (HCW). In this paper, the possibility to use HCW extracted from CDW as alternative component for the production of new clinker is explored.A pure HCW sample was prepared and used in partial replacement of natural materials in raw admixtures for new clinker production. At a replacement degree of 30%, a new Portland clinker containing almost 50% of C3S could be produced with a huge spare in the release of CO2 (about 1/3 less). At higher HCW dosage a non-Portland clinker containing almost 80% of C2S has been obtained: its use as supplementary cementing material in blended cements revealed satisfying long term performances. |
| |
| Keywords: | Hydrated cement waste Recycled aggregate Concrete demolition waste Fine fraction |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
