China Portland cement for export

Specification for China Portland cement

China cement

OPC ASTM C150-97 TYPE I/II & GB175-1999 P.O42.5R & 42.5 cement.
The eligible rate of leaving factory cement and the eligible rate of margin coefficient have kept 100% twenty-five years in succession. Through ISO9002 quality system certification and product quality certification.

Character brief introduction

All the technological indexes of our brand cement overstep the national standard and accord with international advanced level. With their characters of high strength in early period, fast coagulation and hardening, low-alkali, strong resistance to corrosion of acid and alkali, resistance to cold and melt, short period of leaving matrix and high speed construction, they are widely used in industry and civil construction and especially in roads, bridges, ports, water conservancy and underground construction.

Specification for cement

ASTM C150-97 TYPE I/II

(ASTM I / II )	Examine data	Mandatory Targets	Standard
SiO₂(%)	20.61	min.20.0	ASTM C114
Al₂O₃(%)	4.89	max.6.0	ASTM C114
Fe₂O₃(%)	3.41	max.6.0	ASTM C114
MgO (%)	3.68	max.6.0	ASTM C114
SO₃(%)	2.38	max.3.0	ASTM C114
C₃A(%)	7.18	max.8.0	ASTM C114
Loss on Ignition (LOI) (%)	1.69	max.3.0	ASTM C114
Insoluble Residue (%)	0.61	max.0.75	ASTM C114
Alkalies(Na₂O+0.658K₂O) (%)	0.51	max.0.60	ASTM C114
(ASTM I / II )
Blaine m²/kg	347	min.280	ASTM C204
Air Content	7.1	max.12.0	ASTM C185
Vicat (Initial) Set Time	142	min.45	ASTM C191
Vicat (Final) Set Time	195	max.375	ASTM C191
Autoclave Expansion	0.18	max.0.80	ASTM C151
Palse Set Paste	86.0	min.50	ASTM C451
Strength @ 3-day	19.6	min.12.0	ASTM C109/C109M
Strength @ 7-day	25.2	min.19.0	ASTM C109/C109M

Survey report GB175-1999 P.O 42.5 R

Portland Cement GB175-1999 P.O 42.5 R	DATE:		2005.8.1
ITEMS	Examine data	Mandatory Targets	Standard
MgO(%)	3.49	≤5.0	GB/T 176-1999
SO3 (%)	2.48	≤3.5	GB/T 176-1999
LOI(%)	4.29	≤5.0	GB/T 176-1999
Fineness(80p m residue on sieve)(%)	4.0	≤10.0	GB/T 1345-1991
Setting Time: Initial (min)	152	≥45	GB/T 1346-2001
Setting Time: Final (min)	230	≤600	GB/T 1346-2001
Soundness(pat test)	qualified	qualified	GB/T 1346-2001
Strength (3 day):Bending Strength (Mpa)	5.7	≥4.0	GB/T 17671-1999
Strength (3 day):Compressive Strength(Mpa)	28.0	≥21.0	GB/T 17671-1999
Strength (28 day):Bending Strength (Mpa)	8.3	≥6.5	GB/T 17671-1999
Strength (28 day):Compressive Strength(Mpa)	48.0	≥42.5	GB/T 17671-1999

P. O 32.5\P. O 32.5R\P. O 42.5\P. O 42.5R

Items/ Indexex		P. O 32.5		P. O 32.5R		P. O 42.5		P. O 42.5R
Items/ Indexex		National standard	Internally controlled indexes	National standard	Internally controlled indexes	National standard	Internally controlled indexes	National standard	Internally controlled indexes
Cement MgO (%)		≤5.0	≤4.0	≤5.0	≤4.0	≤5.0	≤4.0	≤5.0	≤4.0
Cement SO₃(%)		≤3.5	≤3.0	≤3.5	≤3.0	≤3.5	≤3.0	≤3.5	≤3.0
Cement loss on ignition (%)		≤5.0	≤4.0	≤5.0	≤4.0	≤5.0	≤4.0	≤5.0	≤4.0
Cement fineness (%)		≤10.0	≤6.0	≤10.0	≤6.0	≤10.0	≤4.0	≤10.0	≤4.0
Setting time (min)	Initial setting time	≥45	≥60	≥45	≥60	≥45	≥60	≥45	≥60
Setting time (min)	Final setting time	≤600	≤300	≤600	≤300	≤600	≤270	≤600	≤270
Soundness		qualified	qualified	qualified	qualified	qualified	qualified	qualified	qualified
Strength (MPa)	3-day bending strength	≥2.5	≥3.5	≥3.5	≥4.0	≥3.5	≥4.5	≥4.0	≥5.0
	3-day compressive strength	≥11.0	≥19.0	≥16.0	≥21.0	≥16.0	≥25.0	≥21.0	≥26.0
	28 -day bending strength	≥5.5	≥6.5	≥5.5	≥6.5	≥6.5	≥7.5	≥6.5	≥7.5
	28-day compressive strength	≥32.5	≥38.0	≥32.5	≥38.0	≥42.5	≥50.0	≥42.5	≥50.0

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