Evaluation of blends of high and low calcium fly ashes for use as supplementary cementing materials |
| |
| Affiliation: | 1. State Key Laboratory of Integrated Service Networks, School of Telecommunications Engineering, Xidian University, Xi''an 710071, China;2. School of Physics and Optoelectronic Engineering, Xidian University, Xi''an 710071, China;1. Department of Civil and Environmental Engineering and Construction, University of Nevada, Las Vegas, USA;2. Zachry Department of Civil Engineering, Texas A&M University, College Station, TX, USA;3. Concrete Technology and Durability Research Center, Department of Civil Engineering, Amirkabir University of Technology, Tehran, Iran;4. Department of Civil Engineering, University of Guilan, Rasht, Iran;1. Construction Material Research Group (CMRG), Faculty of Civil Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia;2. Dept. of Architectural Engineering, Hanyang University, Ansan, Republic of Korea;3. Construction Research Centre (UTM CRC), Institute for Smart Infrastructure and Innovative Construction, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia;1. Laboratory of Composite Materials, Institute of Building Materials, Vilnius Gediminas Technical University, Vilnius, Lithuania;2. ISEL, High Institute of Engineering of Lisbon (ISEL), Lisbon Polytechnic Institute, Lisbon, Portugal;3. VTDK, Civil Engineering Faculty, Vilnius College of Technologies and Design, Vilnius, Lithuania |
| |
| Abstract: | The present paper outlines the results of a research attempt aimed at developing and evaluating the performance of ternary blended cements, incorporating mixtures of two different types of fly ash (of high and low calcium content). The main target of this study was to investigate whether and by what means, the introduction of a certain type of fly ash into a fly ash–cement (FC) matrix containing a different type of ash, can improve the performance of the initial binary system. For achieving this, new pozzolans were prepared by mixing, in selected proportions, a high lime fly ash with an ash of lower calcium content. The efficiency of the new materials was examined in terms of active silica content, pozzolanic activity potential, strength development, k-values and progress of the pozzolanic action by means of fixed lime capabilities. The results obtained demonstrated that the mixtures containing equal amounts of each fly ash were the most effective for moderate cement substitution, whilst for higher replacements the intermixture possessing the highest active silica content shows supremacy at almost all hydration ages. The superior performance of the ternary fly ash blends was mainly attributed to synergistic effects detected for all the ashes utilized. These were quantified in each case and almost linear correlations were obtained with the k-values of the most efficient ternary mixes. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
