Kaolin-based geopolymers with various NaOH concentrations

查看全文 作　　者：C.Y. [1]Heah;H. [1]Kamarudin;A.M. Mustafa Al [1]Bakri;M. [2]Bnhussain;M. [1]Luqman;I. Khairul [1]Nizar;C.M. [1]Ruzaidi;Y.M. [1]Liew

机构地区：[1]Center of Excellence Geopolymer and Green Technology (CEGeoGTech), School of Materials Engineering, Universiti Malaysia Perlis (UniMAP);[2]King Abdulaziz City Science and Technology

出　　处：《International Journal of Minerals,Metallurgy and Materials》索引2013年第20卷第3期,共10页

基　　金：the King Abdulaziz City Science and Technology (KACST) for funding this study through collaboration between KACST-Universiti Malaysia Perlis (UniMAP) 摘　　要：Kaolin geopolymers were produced by the alkali-activation of kaolin with an activator solution (a mixture of NaOH and sodium silicate solutions). The NaOH solution was prepared at a concentration of 6-14 mol/L and was mixed with the sodium silicate solution at a Na2SiO3 /NaOH mass ratio of 0.24 to prepare an activator solution. The kaolin-to-activator solution mass ratio used was 0.80. This paper aimed to analyze the effect of NaOH concentration on the compressive strength of kaolin geopolymers at 80℃for 1, 2, and 3 d. Kaolin geopolymers were stable in water, and strength results showed that the kaolin binder had adequate compressive strength with 12 mol/L of NaOH concentration. When the NaOH concentration increased, the SiO2/Na2O decreased. The increased Na2O content enhanced the dissolution of kaolin as shown in X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) analyses. However, excess in this content was not beneficial for the strength development of kaolin geopolymers. In addition, there was the formation of more geopolymeric gel in 12 mol/L samples. The XRD pattern of the samples showed a higher amorphous content and a more geopolymer bonding existed as proved by FTIR analysis. 关键词：NAOH 地聚合物浓度增加高岭土傅里叶变换红外光谱 FTIR分析地质聚合物抗压强度

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Kaolin-based geopolymers with various NaOH concentrations

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