Lime-calcined clay materials with alkaline activation: Phase development and reaction transition zone

The research aim was to investigate phase development and reaction transition zone of alkaline activated lime-calcined clay materials. Locally available china clay mainly supplied metakaolin (MK) after calcination. MK and calcium hydroxide (CH) were used to supply SiO2 and CaO, respectively. The CH...

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Main Authors: Boonjaeng S., Chindaprasirt P., Pimraksa K.
Format: Article
Language:English
Published: Elsevier Ltd 2014
Online Access:http://www.scopus.com/inward/record.url?eid=2-s2.0-84902087431&partnerID=40&md5=c83a977018e8b830a8f239475e022a4d
http://cmuir.cmu.ac.th/handle/6653943832/4808
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spelling th-cmuir.6653943832-48082014-08-30T02:55:48Z Lime-calcined clay materials with alkaline activation: Phase development and reaction transition zone Boonjaeng S. Chindaprasirt P. Pimraksa K. The research aim was to investigate phase development and reaction transition zone of alkaline activated lime-calcined clay materials. Locally available china clay mainly supplied metakaolin (MK) after calcination. MK and calcium hydroxide (CH) were used to supply SiO2 and CaO, respectively. The CH to MK ratio of 0.4 with CaO/SiO2 of 1.18 was selected to coincide with the theoretical CaO/SiO2 of calcium silicate hydrate in tobermorite group (Ca5Si6O16(OH)2). Phase development was investigated using X-ray diffraction and Fourier transform infrared spectroscopy. Compressive strength and density were also investigated to confirm binding properties of the pozzolanic reaction products. The reaction of mixture was dependent on the NaOH concentration. At low concentration of NaOH (<1M), the pozzolanic reaction was dominant while the zeolitic reaction and geopolymerization became dominant at medium NaOH concentration (>1M) and at high NaOH concentration, respectively. The activations of CH:MK mixtures with 0.01 and 0.1M NaOH promoted semicrystalline calcium silicate hydrate (CSH (I)) and crystalline calcium aluminosilicate hydrate (CASH) formations. The mixture with 0.01M NaOH gave the highest compressive strength of 19.0MPa. With 3 and 5M NaOH activations, sodium aluminosilicate hydrate (NASH) and sodium calcium silicate hydrate (NCSH) compounds were formed instead of CSH (I) gel and crystalline CASH phase. At 10M NaOH, NCSH disappeared and only NASH was formed and resulted in a relatively low compressive strength of 6.7MPa. © 2014 Elsevier B.V. 2014-08-30T02:55:48Z 2014-08-30T02:55:48Z 2014 Article 01691317 10.1016/j.clay.2014.05.002 ACLSE http://www.scopus.com/inward/record.url?eid=2-s2.0-84902087431&partnerID=40&md5=c83a977018e8b830a8f239475e022a4d http://cmuir.cmu.ac.th/handle/6653943832/4808 English Elsevier Ltd
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
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language English
description The research aim was to investigate phase development and reaction transition zone of alkaline activated lime-calcined clay materials. Locally available china clay mainly supplied metakaolin (MK) after calcination. MK and calcium hydroxide (CH) were used to supply SiO2 and CaO, respectively. The CH to MK ratio of 0.4 with CaO/SiO2 of 1.18 was selected to coincide with the theoretical CaO/SiO2 of calcium silicate hydrate in tobermorite group (Ca5Si6O16(OH)2). Phase development was investigated using X-ray diffraction and Fourier transform infrared spectroscopy. Compressive strength and density were also investigated to confirm binding properties of the pozzolanic reaction products. The reaction of mixture was dependent on the NaOH concentration. At low concentration of NaOH (<1M), the pozzolanic reaction was dominant while the zeolitic reaction and geopolymerization became dominant at medium NaOH concentration (>1M) and at high NaOH concentration, respectively. The activations of CH:MK mixtures with 0.01 and 0.1M NaOH promoted semicrystalline calcium silicate hydrate (CSH (I)) and crystalline calcium aluminosilicate hydrate (CASH) formations. The mixture with 0.01M NaOH gave the highest compressive strength of 19.0MPa. With 3 and 5M NaOH activations, sodium aluminosilicate hydrate (NASH) and sodium calcium silicate hydrate (NCSH) compounds were formed instead of CSH (I) gel and crystalline CASH phase. At 10M NaOH, NCSH disappeared and only NASH was formed and resulted in a relatively low compressive strength of 6.7MPa. © 2014 Elsevier B.V.
format Article
author Boonjaeng S.
Chindaprasirt P.
Pimraksa K.
spellingShingle Boonjaeng S.
Chindaprasirt P.
Pimraksa K.
Lime-calcined clay materials with alkaline activation: Phase development and reaction transition zone
author_facet Boonjaeng S.
Chindaprasirt P.
Pimraksa K.
author_sort Boonjaeng S.
title Lime-calcined clay materials with alkaline activation: Phase development and reaction transition zone
title_short Lime-calcined clay materials with alkaline activation: Phase development and reaction transition zone
title_full Lime-calcined clay materials with alkaline activation: Phase development and reaction transition zone
title_fullStr Lime-calcined clay materials with alkaline activation: Phase development and reaction transition zone
title_full_unstemmed Lime-calcined clay materials with alkaline activation: Phase development and reaction transition zone
title_sort lime-calcined clay materials with alkaline activation: phase development and reaction transition zone
publisher Elsevier Ltd
publishDate 2014
url http://www.scopus.com/inward/record.url?eid=2-s2.0-84902087431&partnerID=40&md5=c83a977018e8b830a8f239475e022a4d
http://cmuir.cmu.ac.th/handle/6653943832/4808
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