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controlled low-strength material incorporating recycled fine aggregate from urban red brick based construction waste

引用

Journal of Southeast University(English Edition) 2017年第4期33卷 496-501页

作者： Ran Jin Zhang Jinxi Yang Mijia Jia Dongdong Lu Shengdi Beijing Key Laboratory of Traffic Engineering Beijing University of Technology’ Beijing 100124’ China Key Laboratory of Expressway Maintenance Technology of Ministry of Transport (Ji’nan) Ji’nan 250102 Kaibo International Group Corporation Beijing 100022 China Anhui Transportation Holding Group Co. Ltd.Hefei 230088 China

Sixteen controlled low-strength material( CLSM)mixtures with various cement-to-sand( C/Sa) ratios and water-to-solid( W/So) ratios were prepared using recycled fine aggregate from urban red brick based construction *** fluidity and bleeding of the fresh CLSM mixtures were measured via the modified test methods, and the hardened CLSM mixtures were then molded to evaluate their compressive strength and durability. The results showthat the fluidity of the fresh CLSM mixtures is 105 to 227 mm with the corresponding bleeding rate of 3. 7% to 15. 5%, which increases with the increase in fluidity. After aging for 28 d,the compressive strength of the hardened CLSM mixtures reaches 1. 15 to 13. 96 M Pa, and their strength can be further enhanced with longer curing ages. Additionally, the strength increases with the increase of the C/Sa ratio, and decreases with the increase of the W/So ratio under the same curing age. Based on the obtained compressive strength, a fitting model for accurately predicting the compressive strength of the CLSM mixtures was established, which takes into account the above two independent variables( C/Sa and W/So ratios).M oreover, the durability of the hardened CLSM mixtures is enhanced for samples with higher C/Sa ratios.

关键词： controlled low-strength material recycled fine aggregate fo m urban red brick based construction waste fluidity bleeding compressive strength durability

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Performance Appraisal of controlled low-strength material Using Sewage Sludge and Refuse Incineration Bottom Ash

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Chinese Journal of Chemical Engineering 2012年第1期20卷 80-88页

作者：甄广印周海燕赵天涛赵由才 The State Key Laboratory of Pollution Control and Resource Reuse School of Environmental Science and Engi-neeringTongji University Shanghai Laogang Waste Treatment Company

This research evaluated the use of sewage sludge and refuse incineration bottom ash to replace calcium sulfoaluminate cement （CSA） in making controlled low-strength material （CLSM）. Various properties of CLSM mixtures were characterized in terms of unconfined compressive strength, microstructure and leachability. It was found that the strength of tested CLSM mixtures ranged from 3.6 to 9.0 MPa, over the upper excavatable limit of 2.1 MPa. The micro-structural analysis revealed that sewage sludge and bottom ash were crystallochemically in- corporated within CLSM system_s by forming the needle-like ettringite （C3A＇3CS＇_H32） with exiguous *** via the typical Pozzolanic Reaction, leading to a dense and low-porosity microst;＇ucture. Furthermore,-the toxicity characteristic leaching procedure evidenced that the cumulative leachable metals in the leachate were much below the regulatory thresholds. The potential for us!ng sewage sludge and bottom ash!n CLSM makin.g was thus confirmed.

关键词： dewatered siudge refuse incineration bottom ash controlled low-strength material solidification/stabilization leachability

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