title: The effect of lime-dried sewage sludge on the heat-resistance of eco-cement.
abstract: The treatment and disposal of sewage sludge is a growing problem for sewage treatment plants. One method of disposal is to use sewage sludge as partial replacement for raw material in cement manufacture. Although this process has been well researched, little attention has been given to the thermal properties of cement that has had sewage sludge incorporated in the manufacturing process. This study investigated the fire endurance of eco-cement to which lime-dried sludge (LDS) had been added. LDS was added in proportions of 0%, 3%, 6%, 9%, and 12% (by weight) to the raw material. The eco-cement was exposed to 200, 400, or 600 °C for 3 h. The residual strength and the microstructural properties of eco-cement were then studied. Results showed that the eco-cement samples suffered less damage than conventional cement at 600 °C. The microstructural studies showed that LDS incorporation could reduce Ca(OH)(2) content. It was concluded that LDS has the potential to improve the heat resistance of eco-cement products.
authors.affiliation: College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China E-mail: xujick@tongji.edu.cn.
authors.forename: Wen-Quan
authors.initials: WQ
authors.lastname: Li
authors.affiliation: College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China E-mail: xujick@tongji.edu.cn.
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.affiliation: College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China E-mail: xujick@tongji.edu.cn.
authors.forename: Hai-Hua
authors.initials: HH
authors.lastname: Cao
authors.affiliation: College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China E-mail: xujick@tongji.edu.cn; Key Laboratory of Yangtze River Water Environment of Education Ministry, Shanghai 200092, China.
authors.forename: Jing-Cheng
authors.initials: JC
authors.lastname: Xu
authors.affiliation: College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China E-mail: xujick@tongji.edu.cn.
authors.forename: Jia
authors.initials: J
authors.lastname: Liu
authors.affiliation: College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China E-mail: xujick@tongji.edu.cn.
authors.forename: Guang-Ming
authors.initials: GM
authors.lastname: Li
authors.affiliation: College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China E-mail: xujick@tongji.edu.cn.
authors.forename: Juwen
authors.initials: J
authors.lastname: Huang
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry; D003252:Construction Materials / Q000032:analysis* / Q000191:economics; D006358:Hot Temperature; D010087:Oxides / Q000737:chemistry; D012722:Sewage / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D010087:Oxides; D012722:Sewage; C016538:lime