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Novel method for preparation of calcined kaolin intercalation compound-based geopolymer
Abstract This paper introduces a novel method for the preparation of a geopolymer using kaolinite intercalation compound which is calcined at a low temperature and forms a geopolymer by alkaline activation. The samples were characterized by X-ray diffraction (XRD), Thermogravimetric/Differential scanning calorimetry (TG/DSC) and Fourier transformed infrared spectroscopy (FTIR). Coal-bearing strata kaolin (CSK) mainly consisting of kaolinite and quartz was used to prepare the intercalation compound (CSK-K) with potassium acetate (KAc) and calcined below 400°C. The calcination temperature and the dosage of KAc were analyzed. The results showed that CSK calcined below 400 °C cannot be alkali-activated to harden and when the dosage of KAc was 30% by mass of CSK, CSK-K calcined between 350°C and 400°C can be alkali-activated to form the geopolymer with a high compressive strength around 31MPa. This was attributed to the formation of metakaolin and geopolymerization which were related to the effect of intercalation reaction and the content of K+. CSK-K calcined at low temperature has great potential as a novel material for the manufacture of geopolymers.
Highlights Potassium acetate-intercalated kaolinite (CSK-K) is prepared in a simple way. Kaolin calcined below 400°C cannot be alkali-activated to form a geopolymer. CSK-K calcined between 350 and 400°C can form a geopolymer by alkaline activation. The geopolymer prepared in this way has a high compressive strength.
Novel method for preparation of calcined kaolin intercalation compound-based geopolymer
Abstract This paper introduces a novel method for the preparation of a geopolymer using kaolinite intercalation compound which is calcined at a low temperature and forms a geopolymer by alkaline activation. The samples were characterized by X-ray diffraction (XRD), Thermogravimetric/Differential scanning calorimetry (TG/DSC) and Fourier transformed infrared spectroscopy (FTIR). Coal-bearing strata kaolin (CSK) mainly consisting of kaolinite and quartz was used to prepare the intercalation compound (CSK-K) with potassium acetate (KAc) and calcined below 400°C. The calcination temperature and the dosage of KAc were analyzed. The results showed that CSK calcined below 400 °C cannot be alkali-activated to harden and when the dosage of KAc was 30% by mass of CSK, CSK-K calcined between 350°C and 400°C can be alkali-activated to form the geopolymer with a high compressive strength around 31MPa. This was attributed to the formation of metakaolin and geopolymerization which were related to the effect of intercalation reaction and the content of K+. CSK-K calcined at low temperature has great potential as a novel material for the manufacture of geopolymers.
Highlights Potassium acetate-intercalated kaolinite (CSK-K) is prepared in a simple way. Kaolin calcined below 400°C cannot be alkali-activated to form a geopolymer. CSK-K calcined between 350 and 400°C can form a geopolymer by alkaline activation. The geopolymer prepared in this way has a high compressive strength.
Novel method for preparation of calcined kaolin intercalation compound-based geopolymer
Zeng, Lu (author) / Cao, Dan-yang (author) / Xu, Yan (author) / Fan, Chun-wei (author) / Peng, Xiao-qin (author)
Applied Clay Science ; 101 ; 637-642
2014-09-22
6 pages
Article (Journal)
Electronic Resource
English
Novel method for preparation of calcined kaolin intercalation compound-based geopolymer
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