title: Synthesis of belite cement from nano-silica extracted from two rice husk ashes.
abstract: Nano-silicas extracted from a pure rice husk ash calcined in the laboratory (RHA) and ash from an impure industrial rice husk waste (BRHA), were used to form belite cement by firing with two different calcium sources (calcium carbonate and calcium nitrate). The nano-silica extracted from RHA was highly reactive due to its high pore volume and low activation energy of dehydration. The formation of belite cement from both nano-silicas was studied by firing with two different calcium sources, Ca(NO3)2and CaCO3at 800-1100 °C. Both nano-silicas formed the principal phase in belite cement (larnite or β-C2S) at temperatures as low as 800 °C, especially with calcium nitrate as the calcium source. Thus, highly impure BRHA is shown to be very suitable as a starting material for the low-temperature production of belite cement, especially in conjunction with calcium nitrate as the calcium source.
authors.affiliation: Division of Engineering, Mahidol University Kanchanaburi Campus, Kanchanaburi, Thailand. Electronic address: suthatip.sin@mahidol.ac.th.
authors.forename: Suthatip
authors.initials: S
authors.lastname: Sinyoung
authors.affiliation: School of Engineering and Resources, Walailuk University, Nakhonsithammarat, Thailand.
authors.forename: Kittipong
authors.initials: K
authors.lastname: Kunchariyakun
authors.affiliation: School of Energy, Environment and Materials, King Mongkut's University of Technology Thonburi, Bangkok, Thailand. Electronic address: suwimol.asa@kmutt.ac.th.
authors.forename: Suwimol
authors.initials: S
authors.lastname: Asavapisit
authors.affiliation: MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Chemical and Physical Science, Victoria University of Wellington, Wellington, New Zealand.
authors.forename: Kenneth J D
authors.initials: KJD
authors.lastname: MacKenzie
mesh_terms: D002119:Calcium Carbonate / Q000737:chemistry; D017610:Calcium Compounds / Q000737:chemistry; D003252:Construction Materials; D005899:Glass Ionomer Cements / Q000138:chemical synthesis* / Q000737:chemistry; D007220:Industrial Waste; D049329:Nanostructures / Q000737:chemistry*; D009566:Nitrates / Q000737:chemistry; D012275:Oryza / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D013696:Temperature; D014866:Waste Products; D014961:X-Ray Diffraction; D017641:Zeolites / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D017610:Calcium Compounds; D005899:Glass Ionomer Cements; D007220:Industrial Waste; D009566:Nitrates; D014866:Waste Products; C516482:belite; D017641:Zeolites; D012822:Silicon Dioxide; D002119:Calcium Carbonate; C059948:calcium nitrate
keywords: Belite; Cement; Nano-silica; Rice husk ash