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 SiO 2 and CaO, respectively. The CH...

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Main Authors: S. Boonjaeng, P. Chindaprasirt, K. Pimraksa
Format: Journal
Published: 2018
Online Access:https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84902087431&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/45617
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Institution: Chiang Mai University
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spelling th-cmuir.6653943832-456172018-01-24T06:13:51Z Lime-calcined clay materials with alkaline activation: Phase development and reaction transition zone S. Boonjaeng P. Chindaprasirt K. Pimraksa 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 SiO 2 and CaO, respectively. The CH to MK ratio of 0.4 with CaO/SiO 2 of 1.18 was selected to coincide with the theoretical CaO/SiO 2 of calcium silicate hydrate in tobermorite group (Ca 5 Si 6 O 16 (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. 2018-01-24T06:13:51Z 2018-01-24T06:13:51Z 2014-01-01 Journal 01691317 2-s2.0-84902087431 10.1016/j.clay.2014.05.002 https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84902087431&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/45617
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
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 SiO 2 and CaO, respectively. The CH to MK ratio of 0.4 with CaO/SiO 2 of 1.18 was selected to coincide with the theoretical CaO/SiO 2 of calcium silicate hydrate in tobermorite group (Ca 5 Si 6 O 16 (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 Journal
author S. Boonjaeng
P. Chindaprasirt
K. Pimraksa
spellingShingle S. Boonjaeng
P. Chindaprasirt
K. Pimraksa
Lime-calcined clay materials with alkaline activation: Phase development and reaction transition zone
author_facet S. Boonjaeng
P. Chindaprasirt
K. Pimraksa
author_sort S. Boonjaeng
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
publishDate 2018
url https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84902087431&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/45617
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