Lightweight aggregates from industrial sludge-marine clay mixes

被引:20
|
作者
Show, KY
Lee, DJ
Tay, JH
Hong, SY
Chien, CY
机构
[1] Nanyang Technol Univ, Div Environm & Water Resources Engn, Sch Civil & Environm Engn, Singapore 639798, Singapore
[2] Natl Taiwan Univ, Dept Chem Engn, Taipei 10617, Taiwan
来源
JOURNAL OF ENVIRONMENTAL ENGINEERING-ASCE | 2005年 / 131卷 / 07期
关键词
D O I
10.1061/(ASCE)0733-9372(2005)131:7(1106)
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Waste disposal problems are often the result of rapid industrial and economic developments in land-scarce municipalities. Waste utilization could be a viable choice to alleviate the problems by transforming wastes into useful products while conserving natural resources. Previous studies by the writers indicated that in the process of thermal conversion of industrial sludge and dredged marine clay mixes into concrete aggregates, pyro-expansion and bloating were often exhibited by the aggregates. The expansion and bloating mechanisms, however, have not been looked into in greater detail. This research examines the petrology of sintered industrial sludge-marine clay aggregates in order to better understand the mechanisms leading to pyro-expansion and bloating of the aggregates. The study would enable development of an efficient and cost-effective bloating methodology for lightweight aggregate production. Main factors investigated were sludge-clay mix proportions, firing temperatures, and salt additives. The investigation revealed that firing at temperatures of 1,200 and 1,300 degrees C produced aggregates of lower specific gravity in the range of 0.5-1.6. The highest aggregate porosity can be achieved at 1,200 degrees C with a clay content of 50 %. Scanning electron microscope images indicated that the intrinsic lightweight characteristic of the aggregates could be attributed to large pores within a dense surrounding matrix. The effect of lightweight structures may be ascribed to the release of volatile substances at each respective peak endothermic transitions during firing. The release of substances in vapor form required a large amount of energy, which resulted in the peak endothermic transitions that correspond to the formation of the porous lightweight structures. The results suggested that it is possible to promote pores formation in the production of aggregates possessing lightweight characteristics through careful control of temperature and the selection of sludge-clay proportion.
引用
收藏
页码:1106 / 1113
页数:8
相关论文
共 50 条
  • [21] Production of Lightweight Aggregates from Phosphate Washing Plant Sludge
    Fakhfakh, Emna
    Khiari, Imen
    Hajjaji, Walid
    Medhioub, Mounir
    Rocha, Fernando
    Lopez-Galindo, Alberto
    Jamoussi, Fakher
    ENGINEERING GEOLOGY FOR SOCIETY AND TERRITORY, VOL 5: URBAN GEOLOGY, SUSTAINABLE PLANNING AND LANDSCAPE EXPLOITATION, 2015, : 59 - 63
  • [22] Lightweight aggregates produced from sand sludge and zeolitic rocks
    Volland, S.
    Broetz, J.
    CONSTRUCTION AND BUILDING MATERIALS, 2015, 85 : 22 - 29
  • [23] Drying of lightweight concrete produced from crushed expanded clay aggregates
    Merikallio, T
    Mannonen, R
    Penttala, V
    CEMENT AND CONCRETE RESEARCH, 1996, 26 (09) : 1423 - 1433
  • [24] Lightweight expanded aggregates from the mixture of waste automotive if plastics and clay
    Liu, Peiyao
    Farzana, Rifat
    Rajarao, Ravindra
    Sahajwalla, Veena
    CONSTRUCTION AND BUILDING MATERIALS, 2017, 145 : 283 - 291
  • [25] Recycling of sand sludge as a resource for lightweight aggregates
    Volland, S.
    Kazmina, O.
    Vereshchagin, V.
    Dushkina, M.
    CONSTRUCTION AND BUILDING MATERIALS, 2014, 52 : 361 - 365
  • [26] Paper Sludge Reuse in Lightweight Aggregates Manufacturing
    Chen, How-Ji
    Hsueh, Ying-Chih
    Peng, Ching-Fang
    Tang, Chao-Wei
    MATERIALS, 2016, 9 (11):
  • [28] Feasibility Study on Manufacturing Lightweight Aggregates from Water Purification Sludge
    Peng, Ching-Fang
    Chen, How-Ji
    INTERNATIONAL CONFERENCE ON MECHANICAL ENGINEERING AND APPLIED COMPOSITE MATERIALS, 2018, 307
  • [29] Lightweight aggregates based on industrial wastes
    Monteiro, MA
    Raupp-Pereira, F
    Ferreira, VM
    Dondi, M
    Labrincha, JA
    INDUSTRIAL CERAMICS, 2005, 25 (03): : 157 - 163
  • [30] Strength and modulus of marine clay-cement mixes
    Lee, FH
    Lee, Y
    Chew, SH
    Yong, KY
    JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING, 2005, 131 (02) : 178 - 186