Effects of Nano-Materials on Properties of Waterworks Sludge Ash Cement Paste

Wen-Ten Kuo; Kae-Long Lin; Wei-Che Chang; Huan-Lin Luo

Journal of Industrial and Engineering Chemistry, Vol.12, No.5, 702-709, September, 2006

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Effects of Nano-Materials on Properties of Waterworks Sludge Ash Cement Paste

Wen-Ten Kuo, Kae-Long Lin¹, Wei-Che Chang², and Huan-Lin Luo^{3, †}

Department of Civil Engineering, National Kaohsiung University of Applied Sciences, 415 Chien-Kung Road,Kaohsiung 807, Taiwan
¹Department of Environmental Engineering, National Ilan University, I-Land, 26041, Taiwan
²Department of Civil Engineering, Kao Yuan University, No.1821, Jhongshan Rd., Lujhu Township, KaohsiungCounty 82151, Taiwan
³Department of Civil and Ecological Engineering, I-Shou University, 1, section 1, Hsueh-Cheng Rd., Ta-HsuHsiang, Kaohsiung County, Taiwan

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To extend the beneficial reuse of waterworks sludge, nano-SiO2 was considered as an additive to improve the engineering properties of waterworks sludge ash cement paste. Waterworks sludge was first incinerated to ash at 800 ℃. Different amounts of nano-SiO2 were added to the sludge ash and then mixed with cement to make a paste. The benefits of using sludge ash as a replacement for cement were assessed. Tests of the fresh paste properties (including flowability and setting time), hardened paste properties (compressive strength), and microstructure analysis (SEM) were performed to assess the influences of the different proportions of nano-SiO2 and sludge ash added to the paste. Both added admixtures could reduce the flowability and shorten the setting time of the cement paste. Furthermore, the cement paste became denser, more uniform, and exhibited improved early and later compressive strengths after the addition of nano-SiO2. However, because of the late development of pozzolanic effects, the compressive strengths of the cement paste were reduced with increased amounts of ash replaced. This study indicates that, because Portland cement is well compatible with nano-SiO2, the performance of silicate cement is improved and the strength of the hardened cement paste is raised, especially for the early strength.

Keywords:cement paste;nano-SiO2;waterworks sludge ash

[References]

Pan JR, Huang C, Lin S, Resource from Sludge - Forging New Frontiers in Singapore, Beneficial Reuse and Reclamation, CD-ROM (2004)
Luo HL, Lin DF, Kuo WT, Water Sci. Technol., 50, 57 (2004)
Lin DF, Luo HL, Ye MQ, Proceeding of the Conference on the Application of Nano-materials to Recycle Concrete. Kaohsiung County, Taiwan, pp. E1-18 (2005)
Lin DF, Tsai MC, J. Air Waste Manage. Assoc., 56, 1146 (2006)
Shih JY, Chang TP, Hsiao TC, Mater. Sci. Eng., 424, 266 (2006)
Feng Q, Liang CD, Liu GM, J. Mater. Sci. Eng., 22, 224 (2004)
Wang LJ, Wang BM, J. Dalian Univ. Technol., 43, 666 (2003)
Ray JC, Park DW, Ahn WS, J. Ind. Eng. Chem., 12(1), 142 (2006)
Turanli L, Uzal B, Bektas F, Cement Concrete Res., 34, 2277 (2004)
Davraz M, Gunduz L, Cement Concrete Res., 35, 1251 (2005)
Zhu WH, Yin YF, Jiang LH, Che LM, J. Building Mater., 7, 14 (2004)

[Referenced By]

[1] Pan JR, Huang C, Lin S, Resource from Sludge - Forging New Frontiers in Singapore, Beneficial Reuse and Reclamation, CD-ROM (2004)

[2] Luo HL, Lin DF, Kuo WT, Water Sci. Technol., 50, 57 (2004)

[3] Lin DF, Luo HL, Ye MQ, Proceeding of the Conference on the Application of Nano-materials to Recycle Concrete. Kaohsiung County, Taiwan, pp. E1-18 (2005)

[4] Lin DF, Tsai MC, J. Air Waste Manage. Assoc., 56, 1146 (2006)

[5] Shih JY, Chang TP, Hsiao TC, Mater. Sci. Eng., 424, 266 (2006)

[6] Feng Q, Liang CD, Liu GM, J. Mater. Sci. Eng., 22, 224 (2004)

[7] Wang LJ, Wang BM, J. Dalian Univ. Technol., 43, 666 (2003)

[8] Ray JC, Park DW, Ahn WS, J. Ind. Eng. Chem., 12(1), 142 (2006)

[9] Turanli L, Uzal B, Bektas F, Cement Concrete Res., 34, 2277 (2004)

[10] Davraz M, Gunduz L, Cement Concrete Res., 35, 1251 (2005)

[11] Zhu WH, Yin YF, Jiang LH, Che LM, J. Building Mater., 7, 14 (2004)