Journal of the Korean Ceramic Society Vol. 46, No. 1, pp. 58~68, 2009. Rheological Properties of Ordinary Portland Cement - Blast Furnace Slag - Fly Ash Blends Containing Ground Fly Ash Hyo Sang Park, Dong woo Yoo*, Seung Ho Byun, and Jong Taek Song Department of Materials Science and Engineering, Dankook University, Cheonan 330-714, Korea *Major of Materials Science and Engineering, Kunsan National University, Kunsan 573-701, Korea (Received October 28, 2008; Revised December 9, 2008; Accepted December 15, 2008) v yww 3 p p z Á *Á yá k w œw * w œw (2008 10 28 ; 2008 12 9 ; 2008 12 15 ) ABSTRACT In this study, rheological properties of ternary system cement containing ground fly ash(f3, Blaine specific surface area 8,100 cm 2 /g) were investigated using mini slump, coaxial cylinder viscometer and conduction calorimeter. In the results, the segregation resistance was observed at high W/B and PC area while the replacement ratio of F3 was increasing. The 2:5:3 system was shown in higher fluidity and lower hydration heat than 3:4:3 system. The segregation range of cement pastes occurred over 175 mm in average diameter by mini slump and below 10 dynesec/cm 2 of the plastic viscosity or below 50 cp of the yield stress by coaxial cylinder viscometer. It was observed that even if BFS and FA blended together admixture properties would remaine as they were separately. The properties of admixture would not be changed. On the above results, the decreased replacement ratio of OPC and increased replacement ratio of admixtures would be possible. Key words : Fly ash, Blast furnace slag, Rheological properties, Blended cement, Fluidity 1. šdy xy š gj p w ƒ ƒw. ü 2000 š k 1,2) r w r šd w. w šd, 2, k, DMC j 100d šd z š. w p 3) gj p št y š» y p y š, p š yƒ š. p gj p w ¾ š, š gj p ƒ w w ù š ƒ. p r p w gj p v w, g Corresponding author : Jong-Taek Song E-mail : song8253@dankook.ac.kr Tel : +82-41-550-3533 Fax : +82-41-550-3530 j p,,, w š š4) š. gj p t w j» w ƒ yw w 5-7)ƒ w š, t v, š, e{, ke. š š Ÿ, gj z sw p yw š. ü ky ƒ w y š, t yw v ky š. ky k z ƒ w Ì,» w z kz(ash, z) w. w w gj p yw š v (fly ash), m p yw wš. ù k w t r ƒ j» š w y w 58
v yww 3 p p 59 Table 1. Chemical Compositions of Raw Materials (wt%) Chemical Compositions Average Particle Blaine Al 2 O 3 SiO 2 Fe 2 O 3 CaO MgO TiO 2 K 2 O Na 2 O SO 3 LOI Size (µm) (cm 2 /g) OPC 4.19 17.76 3.24 67.16 2.26 0.23 1.21 0.09 2.99 0.84 13.70 3,350 B F S1 14.55 29.98 0.50 45.92 4.90 0.73 0.60 0.21 - - 7.83 3,950 S F F1 23.66 49.83 9.03 8.77 1.83 1.62 1.97 0.72 0.96 2.88 10.70 3,060 A F2 23.68 51.58 8.7 8.00 1.83 1.37 1.8 0.68 0.77 2.84 3.52 8,100 õ OPC : Ordinary Portland Cement, BFS : Blast Furnace Slag, FA : Fly Ash v w w v w ƒ m š š w v w w. w v 3 w p wš w. š v w / w (W/B) s e p š y (PC) w y w p w OPC30:BFS40:FA30 System OPC w jš BFS w ƒ k OPC20 :BFS50:FA30 System v (8,100 cm 2 /g) 0~30%¾ eyw W/B PCw y p yw p w y p v,, y d mw mw. 2. x 2.1. x p S m sp p( w OPC w) w, yw S š ( w BFS w) w. v ( w FA w) s y w. BFS Blaine t 3,950, 7,910 cm 2 /g( w S1, S2 w) w š, w FA Blaine t 3,060 cm 2 /g( w F1 w) 4,120, 8,100 cm 2 /g( w F2, F3 w) w w, OPC BFS, FA yw Table 1 ùkü. š y ü L s e p š y ( w PC w) w. x ey Table 2 ùkü, w Table 3 ùkü. 2.2. v x d 8) v x» w p r p w W/B PC ƒ w d w. x v x 8) k p r p p w yw z w» w š x. w w v g v g š v v w y ùküš 9) p. x 2-3-2 w v g p r p 1 ew z, v g r p r ù ƒ 4 w s³ w t w. w, 90 ¾ Table 2. Experimental Factors Levels Factors OPC-BFS-FA W/B 50, 70 (wt%) Admixtures BFS(S1), FA(F1, F2) Replacement ratios of mineral admixture 0, 10, 20, 30 (wt%) Dosages of Polycarboxylate 0, 0.3, 0.5 (wt%) Table 3. Mixing Ratio of Cement Pastes System Name OPC BFS F1 F2 OPC30%-BFS40% -FA30% system OPC20%-BFS50% -FA30% system (30: 0) (20: 10) (10: 20) (0: 30) (30: 0) (20: 10) (10: 20) (0: 30) 30 40 20 50 30 0 20 10 10 20 0 30 30 0 20 10 10 20 0 30 46«1y(2009)
60 z Á Á yá k y d w d 1 w. v x mw yy ƒ w p w. p r p OPC, š (S1) v (F1, F2) PC š r Fig. 1. Change of mini-slump as a function of PC dosage in cement pastes. (3 : 4 : 3 System) w wz
p 3 yww w, w ƒ w mx» š z 1rpm v yww 3 p p 61 š 150 rpm¾ w g p w. x z Brookfield Fig. 2. Change of mini-slump as a function of PC dosage in cement pastes. (2 : 5 : 3 System) 46«1y(2009)
62 z Á Á yá k RVDV II+(USA), spindle SC4-29 w. 2.3. y d 3:4:3 System 2:5:3 System y p» w W/B 0.5, 20 w y (Tokyo Ricko TCC-26) w 24 y d w w. 3. x š 3.1. p r p v x w 3:4:3 System 2:5:3 System F3 eyw W/B PCw y Figs. 1, 2 ùkü. W/B PCw ƒ ƒw, p w w x w BFS FA Ÿ p w v ey ƒw w w ƒw. v Blaine t ƒ v w» yy ƒ ƒwš FA yy ƒw» p w x w š, SCC(self-compacting concrete) w e yy w p 10,11) w x yy w FA yw r p x yw ƒw w w ùkü ù, w F2 ƒw w w ƒ. x W/B 70 wt% PC 0.3 wt% 0.5 wt% ƒ s³ 175 mm l w. W/B PC ƒ w x ƒ» w x W/B 70 wt% w x w w x w w wz Fig. 3. Rheological curves as a function of PC dosage for the samples with various W/B. (3 : 4 : 3 System)
v yww 3 p p 63 Fig. 4. Rheological curves as a function of PC dosage for the samples with various W/B. (2 : 5 : 3 System) š w. x w v 3:4:3 System 2:5:3 System w ùkü. OPC w 10 wt% jš BFS w 10 wt% ƒ k BFS ƒwš FA w w ƒ. BFS FA Ÿ p yww w Ÿ š p w š û» 11) d OPC š yw ƒ w š ƒ. 3.2. p 3 yw p d m w y w. v w w ƒw p r p š d mw Figs. 3, 4 ùkü. x y ùkü., w š w š»», r w w. w l v(hysteresis Loop) z ƒ w š w, w w p r p yƒ w q (structural breakdown) ùkü ƒ w. 12) š w w w Figs. 5, 6 ùkü. v x PC ƒ W/B ƒ w w š, ƒ 46«1y(2009)
64 z Á Á yá k Fig. 5. Change of plastic viscosity and yield stress as a function of PC dosage for the samples with various replacement ratio of F2. (3 : 4 : 3 System, þ : Segregation) w ùkü W/B 70 wt%, PC 0.3 wt% ƒ û w ùkü. w 3:4:3 system 2:5:3 system û w ùkü x w w ùküš. w x 50 cp w, w 10 dynesec/cm 2 w ƒƒ w. W/B 70 wt%, PC 0.3 wt%, 0.5 wt% 0 w ù v ù kü. W/B 50% 3:4:3 System 2:5:3 system PC 0 wt% 3:4:3 system 2:5:3 system w w ƒw ù, PC 0.3 wt% ƒ w w ù kû. w BFSƒ OPC PC w yy w j ƒ. 11) v W/B 50 wt%, PC 0.3 wt% w ùk ù d ew. w W.B 50 wt%, PC 0.3 wt% ƒ 3:4:3 system w wz F1(20):F2(10) 2:5:3 system F1(10):F3(20)ƒ v, w w d ù kü system w p ƒ. 3.3. xz PC ƒ W/B y xz w w d ww y š wš Fig. 7 ùkü. y w, v d w w š, ƒƒ R 2 ( ) 3:4:3 system 0.691 0.787 ùkü š, 2:5:3 system 0.729 0.852 ùkü 2:5:3 system ƒ. 3.4. y p y z
v yww 3 p p 65 Fig. 6. Change of plastic viscosity and yield stress as a function of PC dosage for the samples with various replacement ratio of F2. (2 : 5 : 3 System, þ : Segregation) gj p üyw en w ü ƒ k, gj p w š. 3 p sp 3) p yw w w ƒ ƒ w ù kü» w s yw ƒ g w. 13,14) x w 3:4:3 system 2:5:3 system y p w» w ƒ w W/B 70, 50 wt%, PC 0.3 wt% F1(10):F2(20) y w d w š Fig. 8 ùkü. š y y Table 4 ùkü. x w OPC>3:4:3 system >2:5:3 system y ùkû, W/B OPC>3:4:3 system >2:5:3 system ùkû. y j OPC w wš y j BFS ƒw 2:5:3 system p ùkü ƒ. w 2:5:3 system 3:4:3 system w ùkü pƒ w ùkü š ew. 13,15) 4. v yww sp p-š -v yw p p q w» w x w. 1. x 50 cp w, w 10 dynesec/cm w 2., W/B 70 wt% PC 0.3, 0.5 wt%, 3 w š, 3:4:3 system W/B 50 wt%, PC 0.5 wt% F1(0): F2(30) wš ù w. 2. ƒ ƒw 3 w ƒw. 3. w v 3:4:3 system 2:5:3 system w ùkü. 4. W/B 50 wt%, PC 0 wt% ƒ 3:4:3 system 2:5:3 system w ƒw š, PC 46«1y(2009)
66 z Á Á yá k Fig. 7. Correlation between plastic viscosity, yield stress and minislump. ( : segregation) Table 4. Hydration Heat Comparision of the Hydrated Cement Pastes Hydration heat OPC 100% (W/B 50%) Notation 3:4:3 System 2:5:3 System (10: 20) (10: 20) OPC 100% (W/B 70%) W/B 50% W/B 70% W/B 50% W/B 70% Total (J/g) 123.58 37.19 34.16 28.99 25.58 91.52 w wz
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