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Use of waste gypsum to replace natural gypsum as set retarders in portland cement

Chandara, Chea ; Azizli, Khairun Azizi Mohd ; Ahmad, Zainal Arifin ; Sakai, Etsuo

Waste Management, 2009, Vol.29(5), pp.1675-1679 [Tạp chí có phản biện]

ISSN: 0956-053X ; E-ISSN: 1879-2456 ; DOI: 10.1016/j.wasman.2008.11.014

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  • Nhan đề:
    Use of waste gypsum to replace natural gypsum as set retarders in portland cement
  • Tác giả: Chandara, Chea ; Azizli, Khairun Azizi Mohd ; Ahmad, Zainal Arifin ; Sakai, Etsuo
  • Chủ đề: Engineering ; Chemistry
  • Là 1 phần của: Waste Management, 2009, Vol.29(5), pp.1675-1679
  • Mô tả: The present study is focused on clarifying the influence of waste gypsum (WG) in replacing natural gypsum (NG) in the production of ordinary Portland cement (OPC). WG taken from slip casting moulds in a ceramic factory was formed from the hydration of plaster of paris. Clinker and 3–5 wt% of WG was ground in a laboratory ball mill to produce cement waste gypsum (CMWG). The same procedure was repeated with NG to substitute WG to prepare cement natural gypsum (CMNG). The properties of NG and WG were investigated via X-ray Diffraction (XRD), X-ray fluorescence (XRF) and differential scanning calorimetry (DSC)/thermogravimetric (TG) to evaluate the properties of CMNG and CMWG. The mechanical properties of cement were tested in terms of setting time, flexural and compressive strength. The XRD result of NG revealed the presence of dihydrate while WG contained dihydrate and hemihydrate. The content of dihydrate and hemihydrates were obtained via DSC/TG, and the...
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 0956-053X ; E-ISSN: 1879-2456 ; DOI: 10.1016/j.wasman.2008.11.014

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