Modeling and optimization of compressive strength and bulk density of metakaolin-based geopolymer using central composite design: A numerical and experimental study

详细信息    查看全文

• 作者：M. Ghanbari^a ; A.M. Hadian^a ; ^{Hadian@ut.ac.ir" class="auth_mail" title="E-mail the corresponding author} ; A.A. Nourbakhsh^b ; ^{anourbakhs@yahoo.com" class="auth_mail" title="E-mail the corresponding author} ; K.J.D. MacKenzie^c
• 关键词：Metakaolin-based geopolymer ; Central composite design ; Optimization ; Compressive strength ; Bulk density
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：324-335
• 全文大小：2345 K

文摘

Geopolymers have received considerable attention due to their properties and applications as environmentally friendly alternatives to ordinary Portland cement. This paper reports the use of a central composite design technique to model four synthesis parameters (curing temperature, SiO₂/Al₂O₃, Na₂O/SiO₂, and H₂O/Na₂O ratio) to optimize the compressive strength and bulk density of metakaolin-based geopolymer bodies. Thirty-one geopolymer paste compositions, derived by applying central composite design software, were prepared and their compressive strengths and bulk densities were measured. The experimental data were then modeled by the method of analysis of variance and the effect of the interactions between the four chosen variables parameters on the compressive strength and bulk density was studied by surface plots. The optimum values of the four variables, determined in this way, were a curing temperature of 67 °C, SiO₂/Al₂O₃=2.90, Na₂O/SiO₂=0.20, H₂O/Na₂O=13.75. The measured strength and density of this sample was 62.4 MPa and 1.59 g/cm³ respectively, and the amorphous character of this sample was demonstrated by XRD.