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- 저자 : Tanakorn Phoo-ngernkham (검색결과 3 건)
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Tanakorn Phoo-ngernkham,Sakonwan Hanjitsuwan,Nattapong Damrongwiriyanupap,Prinya Chindaprasirt 대한토목학회 2017 KSCE Journal of Civil Engineering Vol.21 No.6
In this paper, the mechanical performance of fly ash and Portland cement geopolymer activated with sodium hydroxide and sodium silicate solutions was studied. The Geopolymer Mortars (GM) were made from high calcium Fly Ash (FA) and ordinary Portland Cement (PC) with FA:PC weight ratios of 100:0, 95:5, 90:10, 85:15, and 80:20. The GMs were activated with three combinations of sodium Hydroxide Solution (SH) and sodium Silicate Solution (SS) viz., SH, SH+SS (SH:SS=2) and SS. For all mixes, 10 molar SH, alkali activator liquid/solid binder ratio of 0.60 and curing at ambient temperature of 25oC were used. The result indicated that the compressive and shear bond strengths of GM depended on the alkali activators used and the amount of PC. The use of SH and SHSS resulted in the formation of additional Calcium Silicate Hydrate (CSH) which coexisted with sodium aluminosilicate hydrate (NASH) gel. Whereas, the use of SS resulted in NASH gel with only a small amount of CSH. The increasing of PC content enhanced the compressive and shear bond strengths of GMs due to the formation of additional CSH. The 15% PC mixed with SHSS gave the optimum compressive and shear bond strengths.
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The effects of replacement fly ash with diatomite in geopolymer mortar
Theerawat Sinsiri,Tanakorn Phoo-ngernkham,Vanchai Sata,Prinya Chindaprasirt 사단법인 한국계산역학회 2012 Computers and Concrete, An International Journal Vol.9 No.6
This article presents the effect of replacement fly ash (FA) with diatomite (DE) on the properties of geopolymer mortars. DE was used to partially replace FA at the levels of 0, 60, 80 and 100% by weight of binder. Sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) solutions were used as the liquid portion in the mixture in order to activate the geopolymerization. The NaOH concentrations of 15M, Na2SiO3/NaOH ratios of 1.5 by weight, and the alkaline liquid/binder (LB) ratios by weight of 0.40, 0.50, 0.60 and 0.70 were used. The curing at temperature of 75oC for 24 h was used to accelerate the geopolymerization. The flows of all fresh geopolymer mortars were tested. The compressive strengths and the stress-strain characteristics of the mortar at the age of 7 days, and the unit weights were also tested. The results revealed that the use of DE to replace part of FA as source material in making geopolymer mortars resulted in the increased in the workability, and strain capacity of mortar specimens and in the reductions in the unit weights and compressive strengths. The strain capacity of the mortar increased from 0.0028 to 0.0150 with the increase in the DE replacement levels from 0 to 100%. The mixes with 15M NaOH, Na2SiO3/NaOH of 1.5, LB ratio of 0.50, and using 75oC curing temperature showed 7 days compressive strengths 22.0-81.0 MPa which are in the range of normal to high strength mortars.
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Investigation of Properties of Lightweight Concrete with Calcined Diatomite Aggregate
Patcharapol Posi,Surasit Lertnimoolchai,Vanchai Sata,Tanakorn Phoo-ngernkham,Prinya Chindaprasirt 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.5
This paper reports the investigation of the properties of Lightweight Concrete (LWC) made from Portland cement and diatomiteaggregate. The chemical and physical properties of diatomite and the mechanical properties of LWC with regard to the effects ofcalcined temperature and gradation were studied. The uncalcined diatomite was crushed and calcined at 400, 600, and 800°C for 4hours and used as lightweight aggregate. A constant Water to Cement ratio (W/C) of 2.0 and Aggregate to Cement ratio (A/C) of 1.6were used for all mixes. The 28-day compressive strength of LWC of 6.4-11.9 MPa, porosity and water absorption of 34.0-49.4%,modulus of elasticity of 2.0-4.3 GPa, thermal conductivity of 0.166-0.192 W/mK, and unit weight of 1170-1300 kg/m3 wereobtained. The results indicated that the strength of concrete increased when the calcined temperature of diatomite and the amount ofsmall-size aggregate were increased. The increase in temperature ridded the burnable elements and improved the properties ofdiatomite. The small-size aggregate produced good matrix-aggregate bonding and enhanced the strength of concrete. The calcineddiatomite could, therefore, be used as good aggregate in making lightweight concrete.
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