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Strength and chloride resistance of blended Portland cement mortar containing palm oil fuel ash and fly ash

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International Journal of Minerals,Metallurgy and Materials 2009年第4期16卷 475-481页

作者： Sumrerng Rukzon prinya chindaprasirt Department of Civil Engineering Rajamangala University of Technology Phra Nakhon Department of Civil Engineering Khon Kaen University

This paper presented a study on the strength and chloride resistance of mortars made with ternary blends of ordinary Portland cement （OPC）, ground palm oil fuel ash （POA）, and classified fly ash （FA）. The mortar mixtures were made with Portland cement type I containing 0-40wt% FA and POA. FA and POA with 1wt%-3wt% retained on a sieve No.325 were used. The compressive strength and rapid chloride penetration depth of mortars were determined. The results reveal that the use of ternary blended cements produces good strength mortars. The use of the blend of FA and POA also produces high strength mortars and excellent resistance to chloride penetration owing to the synergic effect of FA and POA. A mathematical analysis and two-parameter polynomial model were presented to predict the compressive strength. The mathematical model correlated well with the experimental results. The computer 3-D graphics of strength of the ternary blended mortars were also constructed and could be used to aid the understanding and the proportioning of the blended system.

关键词： compressive strength chloride resistance fly ash palm oil fuel ash mortar

Effect of chemical admixtures on properties of high-calcium fly ash geopolymer

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International Journal of Minerals,Metallurgy and Materials 2011年第3期18卷 364-369页

作者： Ubolluk Rattanasak Kanokwan Pankhet prinya chindaprasirt Department of Chemistry and Center for Innovation in Chemistry Faculty of Science Burapha University Sustainable Infrastructure Research and Development Center Department of Civil Engineering Faculty of Engineering Khon Kaen University

Owing to the high viscosity of sodium silicate solution, fly ash geopolymer has the problems of low workability and rapid setting time. Therefore, the effect of chemical admixtures on the properties of fly ash geopolymer was studied to overcome the rapid set of the geo-polymer in this paper. High-calcium fly ash and alkaline solution were used as starting materials to synthesize the geopolymer. Calcium chloride, calcium sulfate, sodium sulfate, and sucrose at dosages of 1wt% and 2wt% of fly ash were selected as admixtures based on concrete knowledge to improve the properties of the geopolymer. The setting time, compressive strength, and degree of reaction were recorded, and the microstructure was examined. The results show that calcium chloride significantly shortens both the initial and final setting times of the geopolymer paste. In addition, sucrose also delays the final setting time significantly. The degrees of reaction of fly ash in the geopolymer paste with the admixtures are all higher than those of the control paste. This contributes to the obvious increases in compressive strength.

关键词： geopolymers chemical admixtures setting time fly ash

Factors affecting the shrinkage of fly ash geopolymers

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International Journal of Minerals,Metallurgy and Materials 2011年第1期18卷 100-104页

作者： Charoenchai Ridtirud prinya chindaprasirt Kedsarin Pimraksa Sustainable Infrastructure Research and Development Center Department of Civil EngineeringFaculty of EngineeringKhon Kaen University Department of Industrial Chemistry Faculty of SciencesChiang Mai University

The shrinkage of fly ash geopolymers was studied in the present *** ash was used as the source material for making the *** effects of the concentration of NaOH,sodium silicate-to-NaOH ratio,liquid-to-ash ratio,curing temperature,and curing time on shrinkage were *** geopolymers were cured at 25,40,and 60℃,*** results indicate that the shrinkage of geopolymers is strongly dependent on curing temperature and liquid-to-ash *** increase in shrinkage is associated with the low strength development of *** is also found that NaOH concentration and sodium silicate-to-NaOH ratio also affect the shrinkage of geopolymers but to a lesser extent.

关键词： fly ash inorganic polymers shrinkage compressive strength

Influence of fly ash fineness and shape on the porosity and permeability of blended cement pastes

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International Journal of Minerals,Metallurgy and Materials 2010年第6期17卷 683-690页

作者： Theerawat Sinsiri prinya chindaprasirt Chai Jaturapitakkul School of Civil Engineering Suranaree University of Technology Department of Civil Engineering Khon Kaen University Department of Civil Engineering King Mongkut's University of Technology Thonburi

The effects of the fineness and shape of fly ash on the porosity and air permeability of cement pastes were investigated. Pulverized coal combustion （PCC） fly ash and fluidized bed coal combustion （FBC） fly ash classified into three different finenesses were used. River sand with particle size distribution similar to that of fly ash was also used for comparison. Portland cement was replaced with fly ash and ground sand at the dosages of 0, 20wt%, and 40wt%. A water-to-binder ratio （w/b） of 0.35 was used throughout the experiment. The results show that the porosity and air permeability of the pastes are influenced by the shape, fineness, and replacement level of fly ash. The porosity and air permeability of FBC fly ash pastes are higher than those of PCC fly ash pastes. This is due to the higher irregular shape and surface of FBC fly ash compared to the spherical shape and relatively smooth surface of PCC fly ash. The porosity increases with the increase in fly ash replacement level and decreases with the increase in its fineness. The permeability of PCC fly ash pastes decreases with the increase in replacement level and fineness, while for FBC fly ash, the permeability increases with the increase in replacement level. Decreases in porosity and permeability are due to a combined effect of the packing of fine particles and the reaction of fly ash.

关键词： cement fly ash coal combustion porosity permeability

Electrical conductivity and dielectric property of fly ash geopolymer pastes

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International Journal of Minerals,Metallurgy and Materials 2011年第1期18卷 94-99页

作者： Sakonwan Hanjitsuwan prinya chindaprasirt Kedsarin Pimraksa Sustainable Infrastructure Research and Development Center Department of Civil EngineeringFaculty of EngineerKhon Kaen University Department of Industrial Chemistry Faculty of ScienceChiang Mai University

The electrical conductivity and dielectric property of fly ash geopolymer pastes in a frequency range of 100 Hz-10 MHz were *** effects of the liquid alkali solution to ash ratios（L/A） were *** mineralogical compositions and microstructures of fly ash geopolymer materials were also investigated using X-ray diffraction（XRD） and scanning electron microscopy（SEM）.The 10 mol sodium hydroxide solution and sodium silicate solution at a sodium silicate-to-sodium hydroxide ratio of 1.0 were used in making geopolymer *** pastes were cured at 40℃.It is found that the electrical conductivity and dielectric constant are dependent on the frequency range and L/A *** conductivity increases but the dielectric constant decreases with increasing frequency.

关键词： fly ash inorganic polymers dielectric properties electrical conductivity

Development of high volume rice husk ash alumino silicate composites

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International Journal of Minerals,Metallurgy and Materials 2010年第5期17卷 654-659页

作者： Ubolluk Rattanasak prinya chindaprasirt Prasert Suwanvitaya Department of Chemistry and Center for Innovation in Chemistry Faculty of Sciences Burapha University Department of Civil Engineering Faculty of Engineering Khon Kaen University Department of Civil Engineering Faculty of Engineering Kasetsart University

The development of high volume rice husk ash （RHA） alumino silicate composites （ASC） was studied. RHA was used as the source of silica and aluminium in the ASC. The mass ratios of RHA：Al（OH）3 of 70：30 to 99：1 were tested. The results indicate that the obtained ASC mortars are not stable and disintegrate in water. Boric acid was introduced to the mixture to overcome this problem. Stable ASC mortars with high RHA：Al（OH）3 mass ratios of 90：10 to 97.5：2.5 were obtained with the use of boric acid and 115oC curing. The compressive strength of the mortar of 20 MPa was gained. The immersion test indicates that high volume RHA ASC mortars show good resistance in 3vol% H2SO4 solution, but is slightly less durable in 5wt% MgSO4 solution.

关键词： composite materials rice husk ash aluminium hydroxide boric acid alumino silicates sulphate attack

Thermal treatment and utilization of Al-rich waste in high calcium fly ash geopolymeric materials

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International Journal of Minerals,Metallurgy and Materials 2012年第9期19卷 872-878页

作者： prinya chindaprasirt Ubolluk Rattanasak Pimdao Vongvoradit Supichart Jenjirapanya Sustainable Infrastructure Research and Development Center Department of Civil Engineering Faculty of Engineering Khon Kaen University Khon Kaen 40002 Thailand Department of Chemistry Faculty of Sciences Burapha University Chonburi 20131 Thailand Applied Science Department Faculty of Sciences Chandrakasem Rajabhat University Bangkok 10900 Thailand

The Al-rich waste with aluminium and hydrocarbon as the major contaminant is generated at the wastewater treatment unit of a polymer processing plant. In this research, the heat treatment of this Al-rich waste and its use to adjust the silica/alumina ratio of the high calcium fly ash geopolymer were studied. To recycle the raw Al-rich waste, the waste was dried at 110℃ and calcined at 400 to 1000℃. Mineralogical analyses were conducted using X-ray diffraction （XRD） to study the phase change. The increase in calcination temperature to 600, 800, and 1000℃ resulted in the phase transformation. The more active alumina phase of active θ-Al2O3 was obtained with the increase in calcination temperature. The calcined Al-rich waste was then used as an additive to the fly ash geopolymer by mixing with high calcium fly ash, water glass, 10 M sodium hydroxide （NaOH）, and sand. Test results indicated that the calcined Al-rich waste could be used as an aluminium source to adjust the silica/alumina ratio and the strength of geopolymeric materials. The fly ash geopolymer mortar with 2.5wt% of the Al-rich waste calcined at 1000℃ possessed the 7-d compressive strength of 34.2 MPa.

关键词： waste utilization calcination geopolymers fly ash

Effect of grinding on chemical and physical properties of rice husk ash

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International Journal of Minerals,Metallurgy and Materials 2009年第2期16卷 242-247页

作者： Sumrerng Rukzon prinya chindaprasirt Rattana Mahachai Department of Civil Engineering Rajamangala University of Technology Phra NakhonBangkok 10300Thailand Department of Civil Engineering Faculty of EngineeringKhon Kaen University40002Thailand Department of Chemistry Faculty of ScienceKhon Kaen University40002Thailand

The effect of grinding on the chemical and physical properties of rice husk ash was studied. Four rice husk ashes with different finenesses, i.e. coarse original rice husk ash （RHA0）, RHA1, RHA2, and RHA3 were used for the study. Ordinary Portland cement （OPC） was partially replaced with rice husk ash at 20% by weight of binder. The water to binder ratio （W/B） of the mortar was maintained at 110%±5% with flow table test. Specific gravity, fineness, chemical properties, compressive strength, and porosity test of mortars were determined. The differences in chemical composition of the rice husk ashes with different finenesses from the same batch are small. The use of RHA3 produces the mortars with good strength and low porosity. The strength of the mortar improves with partial replacement of RHA3 in comparison with normal coarse rice husk ash. The use of RHA3 results in a strong and dense mortar, which is due to the better dispersion and filling effect, as well as an increase in the pozzolanic reaction.

关键词： fineness grinding mortar physical properties rice husk ash

Cellular lightweight concrete containing high-calcium fly ash and natural zeolite

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International Journal of Minerals,Metallurgy and Materials 2013年第5期20卷 462-471页

作者： Khamphee Jitchaiyaphum Theerawat Sinsiri Chai Jaturapitakkul prinya chindaprasirt School of Civil Engineering Institute of EngineeringSuranaree University of TechnologyNakhon Ratchasima 30000Thailand Department of Civil Engineering Faculty of EngineeringKing Mongkut's University of Technology ThonburiBangkok 10140Thailand Sustainable Infrastructure Research and Development Center Department of Civil EngineeringFaculty of Engineering Khon Kaen UniversityKhon Kaen 40002Thailand

Cellular lightweight concrete （CLC） with the controlled density of approximately 800 kg/m3 was made from a preformed foam, Type-I Portland cement （OPC）, fly ash （FA）, or natural zeolite （NZ）, and its compressive strength, setting time, water absorption, and microstructure of were tested. High-calcium FA and NZ with the median particle sizes of 14.52 and 7.72 μm, respectively, were used to partially replace OPC at 0, 10wt%, 20wt%, and 30wt% of the binder （OPC and pozzolan admixture）. A water-to-binder mass ratio （W/B） of 0.5 was used for all mixes. The testing results indicated that CLC containing 10wt% NZ had the highest compressive strength. The replacement of OPC with NZ decreased the total porosity and air void size but increased the capillary porosity of the CLC. The incorporation of a suitable amount of NZ decreased the setting time, total porosity, and pore size of the paste compared with the findings with the same amount of FA. The total porosity and cumulative pore volume decreased, whereas the gel and capillary pores increased as a result of adding both pozzolans at all replacement levels. The water absorption increased as the capillary porosity increased; this effect depended on the volume of air entrained and the type or amount of pozzolan.

关键词： lightweight concrete fly ash zeolites compressive strength microstructure water absorption