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dc.contributor.authorS. Boonjaengen_US
dc.contributor.authorP. Chindaprasirten_US
dc.contributor.authorK. Pimraksaen_US
dc.description.abstractThe 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 SiO2and CaO, respectively. The CH to MK ratio of 0.4 with CaO/SiO2of 1.18 was selected to coincide with the theoretical CaO/SiO2of 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.en_US
dc.subjectEarth and Planetary Sciencesen_US
dc.titleLime-calcined clay materials with alkaline activation: Phase development and reaction transition zoneen_US
article.title.sourcetitleApplied Clay Scienceen_US
article.volume95en_US Mai Universityen_US Kaen Universityen_US
Appears in Collections:CMUL: Journal Articles

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