CEMENTITIOUS CHARACTERISTICS OF ULTRAFINE POWDER FOR COAL-FIRED CFB ASH AND CFB SLAG

WANG Jianke; LIAO Hongqiang; DUAN Siyu; YANG Yelin; GAO Hongyu

doi:10.13205/j.hjgc.202208015

Volume 40 Issue 8

Nov. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2022 > 40(8): 110-117

WANG Jianke, LIAO Hongqiang, DUAN Siyu, YANG Yelin, GAO Hongyu. CEMENTITIOUS CHARACTERISTICS OF ULTRAFINE POWDER FOR COAL-FIRED CFB ASH AND CFB SLAG[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(8): 110-117. doi: 10.13205/j.hjgc.202208015

Citation:

WANG Jianke, LIAO Hongqiang, DUAN Siyu, YANG Yelin, GAO Hongyu. CEMENTITIOUS CHARACTERISTICS OF ULTRAFINE POWDER FOR COAL-FIRED CFB ASH AND CFB SLAG[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(8): 110-117. doi: 10.13205/j.hjgc.202208015

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CEMENTITIOUS CHARACTERISTICS OF ULTRAFINE POWDER FOR COAL-FIRED CFB ASH AND CFB SLAG

doi: 10.13205/j.hjgc.202208015

1. State Environment Protection Key Laboratory of Efficient Utilization of Coal Waste Resources & Shanxi Key Laboratory of Coal and Electricity Pollution Control and Waste Resource Utilization, Institute of Resources and Environment Engineering, Shanxi University, Taiyuan 030006, China;
2. College of Environmental Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030006, China

Received Date: 2021-11-27
Publish Date: 2022-11-08

Abstract

Abstract

Aiming at the problem of resource utilization of coal-fired circulating fluidized bed boiler (CFB) ash and slag, the CFB ash and slag were ultra-refined by a supersonic steam mill. The cement-based cementitious properties of CFB ash ultrafine powder and their mixtures were compared and studied, including compressive strength, water requirement of normal consistency, stability and setting time. The results showed that under the premise of meeting the P·F 42.5 strength standard, the incorporation of CFB original ash in cement reached 40%, the CFB ash ultrafine powder was 55%, the CFB slag ultrafine powder was 25%, and the incorporation of CFB ash and slag wltrafine powder reached 40% if the CFB ash and slag were mixed according to 2∶1. The incorporation of CFB slag ultrafine powder significantly increased the water requirement of normal consistency of the cement system. A large dosage (≥70%) would lead to the early setting of the cementitious system, and less dosage (≤55%) would show retarding effect. Although the addition of solid waste superfine powder led to the deterioration of volume stability of the cement system, it still met the requirements of China’s national standard, GB 175—2020 Common Portland Cement (＜5 mm).
- CFB ash,
- CFB slag,
- superfine pulverization,
- gelation characteristics

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References

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