Microconcrete with partial replacement of Portland cement by fly ash and hydrated lime addition |
| |
| Affiliation: | 1. Instituto de Ciencia y Tecnología del Hormigón (ICITECH), Universitat Politècnica de València, Camino de Vera s/n, Edificio 4N, E-46022 Valencia, Spain;2. Departamento de Construcciones Arquitectónicas, Universitat Politècnica de València, Camino de Vera s/n, E-46022 Valencia, Spain;1. Department of Construction, School of Engineering, University of Extremadura, Institute for Sustainable Regional Development (INTERRA), 10003 - Cáceres, Spain;2. Materials Recycling Department, Eduardo Torroja Institute for Construction Science, Spanish National Research Council (CSIC), 28033 - Madrid, Spain;3. SOSMAT, University of Extremadura, CSIC Partnering Unit, Spain;1. Department of Civil Engineering, Faculty of Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, UK;2. Civil Engineering Department, Faculty of Engineering, University of Anbar, Iraq;2. Instituto de Ciencia y Tecnología del Hormigón, ICITECH, Camino de Vera s/n, Edificio 4N, Universitat Politècnica de València, E-46022 Valencia, Spain |
| |
| Abstract: | The reduction in Portland cement consumption means lower CO2 emissions. Partial replacement of Portland cement by pozzolans such as fly ash has its limitations due to the quantity of calcium hydroxide generated in the mix. In this work we have studied the contribution of the addition of hydrated lime to Portland cement + fly ash systems. We have also studied several levels of cement replacement, ranging from 15% to 75%.The best mechanical results were obtained replacing 50% of Portland cement by the same amount of fly ash plus the addition of hydrated lime (20% respect to the amount of fly ash). In these systems, an acid-base self-neutralization of the matrix has occurred through a pozzolanic reaction of fly ash with portlandite liberated in the hydration of Portland cement and the added hydrated lime. It has been identified for these mixtures a significant amount of hydrated gehlenite, typical reaction product from rich-alumina pozzolans. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
