testskek - 1 Dr Kimberly Kurtis School of Civil Engineering...

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Unformatted text preview: 1 Dr. Kimberly Kurtis School of Civil Engineering Georgia Institute of Technology Atlanta, Georgia Tests on Portland Cement Composition ~ 5 CSH 2 CaSO 4 •2H 2 O Calcium sulfate dihydrate 5 - 15 C 4 AF 4CaO•Al 2 O 3 •Fe 2 O 3 Tetracalcium aluminoferrite 5 - 10 C 3 A 3CaO•Al 2 O 3 Tricalcium aluminate 15 - 30 C 2 S 2CaO• SiO 2 Dicalcium silicate 50 - 70 C 3 S 3CaO•SiO 2 Tricalcium silicate Mass (%) Shorthand Notation Chemical Formula Chemical Name 2 Composition The relative quantities of each of these phases affects: • setting time • rate of strength development • overall strength • durability • color It is important, then, to know the composition of the cement. Physical Properties Fineness Soundness Consistency Setting time False set and flash set Compressive strength Heat of hydration Loss on ignition Density Bulk density Sulfate expansion Tests on Portland, Blended & Hydraulic Cements Tests on Portland, Blended & Hydraulic Cements Chemical Properties Chemical analysis Compound composition Chemical limits 3 Alite, C 3 S Belite, C 2 S Width of field = 0.31 mm 4 http://www.bruker-axs.de / Chemical Analysis Chemical Analysis ASTM C 114 Standard Test Methods for Chemical Analysis of Hydraulic Cement Manganic oxide Mn 2 O 3 Sulfide sulfur Titanium dioxide TiO 2 Phosphorus pentoxide P 2 O 5 Zinc oxide ZnO Potassium oxide K 2 O Sodium oxide Na 2 O Loss on ignition LOI Sulfur trioxide SO 3 Magnesium oxide MgO Calcium oxide CaO Ferric oxide Fe 2 O 3 Aluminum oxide Al 2 O 3 Silicon dioxide SiO 2 Major components Minor components Separate determinations • Insoluble residue • Free calcium oxide • CO 2 (carbon dioxide) • Water-soluble alkali • Chloroform – soluble organic substances 5 ASTM C114 Oxide % SiO 2 20.6 Al 2 O 3 5.07 Fe 2 O 3 2.90 CaO 63.9 MgO 1.53 K 2 O 0.73 Na 2 O 0.15 SO 3 2.53 LOI 1.58 Oxide Analysis + other trace elements Oxide Shorthand Common Name CaO C lime SiO 2 S silica Al 2 O 3 A a l u m i n a Fe 2 O 3 F ferric oxide MgO M magnesia H 2 O H w a t e r K 2 O K alkalis Na 2 O N SO 3 sulfate S CO 2 carbonate C 90 – 95% (Only valid when A/F ≥ 0.64) C 2 S = 2.87S – 0.75C 3 S C 3 A = 2.65A – 1.69F C 4 AF = 3.04F Bogue Composition Compound Composition Compound Composition C 3 S = 4.07C – 7.60S – 6.72A – 1.43F – 2.85S 6 Bogue Composition: Example Oxide Analysis C 3 S = 4.07(63.9) – 7.60(20.6) – 6.72(5.07) – 1.43(2.90) - 2.85(2.53) = 58.1 C 2 S = 2.87(20.6) – 0.754(58.1) = 15.6 C 3 A = 2.65(5.07) – 1.69(F 2.90) = 8.5 C 4 AF = 3.04(2.90) = 8.8 Calculated Phase Composition Oxide % SiO 2 20.6 Al 2 O 3 5.07 Fe 2 O 3 2.90 CaO 63.9 MgO 1.53 K 2 O 0.73 Na 2 O 0.15 SO 3 2.53 LOI 1.58 9% C 4 AF 9% C 3 A 16% C 2 S 58% C 3 S Bogue Potential Composition: Oxide % SiO 2 20.6 Al 2 O 3 5.07 Fe 2 O 3 2.90 CaO 63.9 MgO 1.53 K 2 O 0.73 Na 2 O 0.15 SO 3 2.53 LOI 1.58 Typical Chemical Composition of Portland Cement Oxide Analysis + other trace elements Sodium equivalent, Na 2 Oe Na 2 Oe = Na 2 O + (0.658 x K 2 O) Na 2 Oe = 0.15 + (0.658 x 0.73) Na 2 Oe = 0.63% 7...
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testskek - 1 Dr Kimberly Kurtis School of Civil Engineering...

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