Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 184, Issue -, Pages 545-551Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2016.10.027
Keywords
Waste cooking oil; Portland cement; Grinding aid; Compressive strength; Calcium hydroxide; Consistency
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Funding
- National Natural Science Foundation of China [51132010, 51302189, 51578412, 51308406]
- National Key Project of Scientific and Technical Supporting Programs of China [2014BAL03B02]
- Fundamental Research Funds for the Central Universities
- Key Laboratory of Advanced Civil Engineering Materials (Tongji University), Ministry of Education
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Although there are several methods for managing waste cooking oil (WCO), a significant result has not been achieved in China. A new method is required for safe WCO management that minimizes the environmental threat. In this context, this work was developed in which cement clinker and gypsum were interground with various WCOs, and their properties, such as grindability, water-cement ratio required to achieve a normal consistency, setting times, compressive strength, contents of calcium hydroxide and ettringite in the hardened paste, microstructure and economic and environmental considerations, were addressed in detail. The results show that, overall, WCO favorably improves cement grinding. WCO prolonged the cement setting times and resulted in longer setting times. Additionally, more remarkable effects were found in cements in which WCO contained more unsaturated fatty acid. WCOs increased the cement strength. However, this enhancement was rated with respect to the WCO contents and components. WCOs decreased the CH and AFt contents in the cement hardened paste. Even the AFt content at later ages was reduced when WCO was used. WCO also densify microstructure of the hardened cement paste. It is economically and environmentally feasible to use WCOs as grinding aids in the cement grinding process. These results contribute to the application of WCOs as grinding aids and to the safe management of WCO. (C) 2016 Elsevier Ltd. All rights reserved.
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