PORTLAND CEMENT 42.5

GREY PORTLAND CEMENT CONSTRUCTION GRADE 42.5 ACCORDING TO UNITED STATES STANDARDS ASTM C 150, AS FOLLOWS:  

Silicon Dioxide (SiO2) 20.8–21.5   

Blain CM2/GR 3.250 

Aluminium Oxide (Al2O3) 5.30 

Autoclave Expansion 0.02 

Ferric Oxide (Fe2O3) 3.25–3.5 

Normal Consistency % 27.5 

Calcium Oxide (CaO) 65.60 

Initial Setting Time (Hours:Mins) 3.25 – 4.50 

Magnesium Oxide (MgO%) 1.7–3.0 

Hard Set (Hours:Mins) 4.54 – 6.00 

Sulphur Trioxide (SO3) 2.7–3.0 

Fitness Index (CM2/GM) 2800-3040 

CHEMICAL COMPOSITION  

PHYSICAL AND MECHANICAL PROPERTIES   

Loss Of Ignition (LOI) 1.8–3.0  

COMPRESSION STRENGTH      

Insoluble Residue % 0.1–0.7 

@ 03 DAYS 2.65 – 34.2 KG/CM2 

Tricalcium Silicate (C3S%) 50.0–54.4  

@ 07 DAYS 37.3 – 42.5 KG/CM2  

Dicalcium Silicate (C2S%) 14.2–18.2  

@ 28 DAYS 52.8 – 54.6 KG/CM2  

Tricalcium Aluminate (C3A%) 6.0–6.8 

Tricalcium Alumino Ferrice (C4AF%) 11.6 

Chromium (Cr%) 2.0Max

PHYSICAL PROPERTIES:          

SOUNDNESS AUTOCLAVE EXPANSION      MAXIMUM 0.8%                     MAXIMUM 0.8% 

SURFACE AREA cm2/gm  

(BLAINE METHOD)          NOT LESS THAN 2800          NOT LESS THAN 2800 

INITIAL SETTING TIME (VICAT)        MINIMUM 45 min  

FINAL SET TIME (VICAT)          MAXIMUM 375 min 

COMPRESSION RESISTANCE N/mm2           CUBES 5 X 5 X 5 cm              CUBES 5 X 5 X 5 cm 

MINIMUM 10.3 (1 day )           MINIMUM 10.3 (1 day ) 

MINIMUM 17.2 ( 3 days )        MINIMUM 17.2 ( 3 days ) 

MINIMUM 27.6 ( 7 days)         MINIMUM 27.6 ( 7 days) 

MINIMUM 42.5 ( 28 days)       MINIMUM 42.5 ( 28days) 

HYDRATION KJ/Kg AFTER 7 days       MAXIMUM 290 KJ/KGM         MAXIMUM 290 KJ/KGM