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《中国化学工程学报(英文版)》 2012-01
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Performance Appraisal of Controlled Low-strength Material Using Sewage Sludge and Refuse Incineration Bottom Ash

ZHEN Guangyin 1,ZHOU Haiyan 2,ZHAO Tiantao 1 and ZHAO Youcai 1,** 1 The State Key Laboratory of Pollution Control and Resource Reuse,School of Environmental Science and Engi-neering,Tongji University,Shanghai 200092,China 2 Shanghai Laogang Waste Treatment Company,Shanghai 201302,China  
This research evaluated the use of sewage sludge and refuse incineration bottom ash to replace calcium sulfoaluminate cement(CS(_)A) 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 systems by forming the needle-like ettringite(C3A?3CS(_)?H32) with exiguous tubers via the typical Pozzolanic Reaction,leading to a dense and low-porosity microstructure.Furthermore,the toxicity charac-teristic leaching procedure evidenced that the cumulative leachable metals in the leachate were much below the regulatory thresholds.The potential for using sewage sludge and bottom ash in CLSM making was thus confirmed.
【Fund】: Supported by the Science and Technology Commission of Shanghai Municipality (08 DZ 1202802 09 DZ 1204105 09 DZ2251700);; the National Natural Science Foundation of China (51008322)
【CateGory Index】: X705
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