Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 300, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2021.124012
Keywords
Blended cement; Calcined coal gangue; Limestone; Reactivity; Hydration
Categories
Funding
- Hunan University
Ask authors/readers for more resources
The combined use of calcined coal gangue and limestone can enhance the compressive strength of cement and improve the microstructure of the material, thus enhancing the mechanical performance.
Utilization of calcined coal gangue (CCG) as cement replacement has the potential to relieve the environmental burden and reduce clinker consumption. However, typical coal gangue in China usually contains low kaolinite content and exhibits poor pozzolanic reactivity even after calcination. This study aims to enhance the performance of CCG blended cement by coupled use of limestone. To further understand the pozzolanic and synergic effect of CCG (with kaolinite content of similar to 28.4%) and limestone, comparative studies were also conducted by replacing cement with CCG or inert quartz powder from 0 up to 60%. From the results of the experiment, it was clear that the co-utilization of CCG and limestone (2:1 wt ratio) enhances the later strength by 5 similar to 12% as compared with corresponding CCG mortars. Microstructure studies also reveal that limestone facilitates low-kaolinite CCG to form hemi-and monocarboaluminates which refine the pore structure and improve the mechanical performance. In addition, the toxicity characteristic leaching procedure (TCLP) test was performed and no leached toxic element was detected for all blended cements containing CCG. (C) 2021 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available