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CEMENT

CEMENT

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Descripción
SPECIFICATIONS OF CEMENT 42,5 R ORIGIN :
RUSSIA / UKRAINE / INDONESIA /
SOUTH AMERICA

Grey Portland cement for construction grade 42.5
R as our following specification
chemical composition: Portland cement Type I or
2 42.5 R according to BS 12 / 1996 or
ASTM - C 150
Silicon dioxide 20,5 % minimum
Aluminium Oxide ( Al2O3 4,3 % to 6,0 % maximum
Iron oxide ( Fe 2O3 ) 3,8 % to 6,0 % maximum
Calcium Oxide ( CaO ) 62,2 % to 67,0 % maximum
Magnesium Oxide ( MgO ) 1,10 % minimum
Sulfur trioxide ( SO3 ) 2,7 % ASTM C 563 optimum
3,0 % maximum
Loss on Ignition 1,10 % to 3,0 % maximum
Insoluble Residue 0,2 % to 0,75 % maximum
Alkalies as Na 2O 0,45 % to 0,6 %
Tricalcium Silicate ( C3S ) 8,0 % to 9,8 % maximum
PHYSICAL ANALYSIS
Blaine surface, m2/kg 370 to 380
% passing 325 mesh sieve 95,1 to 93,5
Vicat Set, minutes
Initial 115 not less than 45
Not more than 375
Final 235
Air content 7,7 % 12 % maximum
Autoclave Expansion 0,02 % to 0,8 % minimum
Compression Strenght, p.s.i. ( Mpa )
1 day 2430 ( 16,8 ) > 2100
3 days 230 KG / CM2

7 days 305 KG / MC2
28 days 420 KG /CM2
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