Standardization

Public significance

As Portland cement is considered to be a product of particular importance for the stability and security of facilities he is subject of mandatory implementation of conformity assessment procedure, which consists of a series of measurements and activities. In Serbia the appropriate regulation is the Rulebook On Cement Quality (“Official Gazette of the RS No. 34/2013 and 44/2014 hereinafter referred to as Rulebook).

Types and composition of cements

The provisions of the Rulebook shall apply to the following cements:
1. Common Portland cement;
2. Sulfate resisting common cement;
3. White Portland cement;
4. Low heat common Portland cement;
5. Calcium aluminate cement.

According to Rulebook, common Portland cements are grouped into the following five varieties:
1. CEM I Portland cement;
2. CEM II Portland – composite cement;
3. CEM III Blastfurnace cement;
4. CEM IV Pozzolanic cement;
5. CEM V Composite cement.

The composition of the common Portland cements by individual types are shown in Table 1.
The composition of the Sulfate resisting common Portland cements by individual types are shown in Table 2.

Strength classes of cement

Cements are according to standard strength grouped into three classes, they being:
• Class 32,5
• Class 42,5
• Class 52,5

Three classes of early strength are defined for each class of standard strength:
• Class with ordinary early strength – N
• Class with high early strength – R
• Class with low early strength – L
Class L can be applied only on CEM III cements.

Additional perfomance of cement

Sulfate resisting common Portland cements are identified by the notation SR.
Low heat common Portland cements are identified by the notation LH.

Labeling

In technical, commercial and other documentation, as well as on bags, according to the Rulebook, cement are designated with the following mark : X Y (Z), where: 
X designates the type of cement
Y designates the class of standard strength of cement
Z designates the additional (optional) label for sulfate resisting common cements and low heat common cements.
The link between labeling of types of cement according to the Rulebook and standards SRPS EN 197-1 and SRPS 14647 is shown in Table 3.

Conformity assesment

Characteristics of quality of common Portland cements for mandatory assessment of conformity are tested through the implementation of methods determined in the following standards:

SRPS EN 196- 1:2017	Methods of testing cement - Part 1: Determination of strength
SRPS EN 196-2:2015	Methods of testing cement - Part 2: Chemical analysis of cement
SRPS EN 196-3:2017	Methods of testing cement - Part 3: Determination of setting times and saundness
SRPS EN 196-5:2012	Methods of testing cement - Part 5: Pozzolanicity test for pozzolanic cement
SRPS EN 196-6:2019	Methods of testing cement – Part 6: Determination of fineness
SRPS EN 196-8:2011	Methods of testing cement - Part 8: Heat of hydration - Solution method
SRPS EN 196-9:2011	Methods of testing cement - Part 9: Heat of hydration - Semi-adiabatic method
SRPS EN 196-10:2017	Methods of testing cement - Part 10: Determination of the water-soluble chromium (VI) content of cement
SRPS EN 196-11:2019	Methods of testing cement - Part 11: Heat of hydration - Isothermal Conduction Calorimetry method
SRPS CEN/TR 196-4:2009	Methods of testing cement – Part 4: Quantitative determination of constituents
SRPS B.C8.023:2021	Cement - Determination of bulk density
SRPS EN 13639:2017	Determination of total organic carbon in limestone
ISO 9277:2010	Determination of the specific surface area of solids by gas adsorption using the BER method

Table 1 – Main types of cement and composition

Composition in percentage by mass1)

Main types	Notation of the 27 products (types of common cement)		Composition  (percentage by mass % a))
			Main constituents										Minor additional constituents
			Clinker	Blast furnace slag	Silica fume	Pozzolan		Fly ash		Bunt shale	Limestone
						natural	Natural calcined	siliceous	calcareous
	Name	Notation	K	S	D b)	P	Q	V	W	T	L	LL
CEM I	Portland cement	PC	95-100	-	-	-	-	-	-	-	-	-	0 to 5
CEM II	Portland – slag cement	PC 20S	80-94	6-20	-	-	-	-	-	-	-	-	0 to 5
		PC 35S	65-79	21-35	-	-	-	-	-	-	-	-	0 to 5
	Portland –silica fume cement	PC 20D	90-94	-	6-10	-	-	-	-	-	-	-	0 to 5
	Portland –pozzolan cement	PC 20P	80-94	-	-	6-20	-	-	-	-	-	-	0 to 5
		PC 35P	65-79	-	-	21-35	-	-	-	-	-	-	0 to 5
		PC 20Q	80-94	-	-	-	6-20	-	-	-	-	-	0 to 5
		PC 35Q	65-79	-	-	-	21-35	-	-	-	-	-	0 to 5
	Portland – fly ash cement	PC 20V	80-94	-	-	-	-	6-20	-	-	-	-	0 to 5
		PC 35V	65-79	-	-	-	-	21-35	-	-	-	-	0 to 5
		PC 20W	80-94	-	-	-	-	-	6-20	-	-	-	0 to 5
		PC 35W	65-79	-	-	-	-	-	21-35	-	-	-	0 to 5
	Portland –burnt shale  cement	PC 20T	80-94	-	-	-	-	-	-	6-20	-	-	0 to 5
		PC 35T	65-79	-	-	-	-	-	-	21-35	-	-	0 to 5
	Portland –limestone cement	PC 20L	80-94	-	-	-	-	-	-	-	6-20	-	0 to 5
		PC 35L	65-79	-	-	-	-	-	-	-	21-35	-	0 to 5
		PC 20LL	80-94	-	-	-	-	-	-	-	-	6-20	0 to 5
		PC 35LL	65-79	-	-	-	-	-	-	-	-	21-35	0 to 5
	Portland –composite b)	PC 20M	80-88	<-----------------------------12-20 ---------------------------->									0 to 5
		PC 35M	65-79	<--------------------------------21-35 ------------------------->									0 to 5
CEM III	Blast furnace cement	M 35K	35-64	36-65	-	-	-	-	-	-	-	-	0 to 5
		M 20 K	20-34	66-80	-	-	-	-	-	-	-	-	0 to 5
		M 5K	5-19	81-95	-	-	-	-	-	-	-	-	0 to 5
CEM IV	Pozzolanic cement c)	P 35	65-89	-	<-----------------11-35 --------------->					-	-	-	0 to 5
		P 55	45-64	-	<----------------- 36-55 --------------->					-	-	-	0 to 5
CEM V	Composite cement c)	MP 30	40-64	18-30	-	<--------18-30------->			-	-	-	-	0 to 5
		MP 50	20-38	31-49	-	<--------31-49------->			-	-	-	-	0 to 5
a) The values in the Table refer to the sum of the main and minor additional constituents.  b) The proportion of silica fume is limited to 10%. c) In Portland-composite cements PC 20M and PC 35M, in pozzolanic cements P 35 and P 55 and in composite cements MP 30 and MP 50 the main constitutes other than clinker shall be declared by designation of the cement.

Table 2 – Main types of sulfate resisting common cements and composition

Main types	Notation of the 7 products (types of sulfate resisting common cement)		Composition (percentage by mass %)
			Main constitutes				Minor additional constituents
			Clinker	Gran. blast furnace slag	Pozzolan natural	Siliceous fly ash
			K1	S	P	V
CEM I	Sulfate resisting Portland cement	PC-SR 0	95-100	-	-	-	0-5
		PC-SR 3
		PC-SR 5
CEM III	Sulfate resisting blast furnace cement	M 20K-SR	20-34	66-80	-	-	0-5
		M 5K-SR	5-19	81-95	-	-	0-5
CEM IV	Sulfate resisting pozzolanic cement	P 35- SR	65-79	-	<--------------21-35--------->		0-5
		P 55- SR	45-64	-	<--------------36-55--------->		0-5
1 Chemical composition of clinker must be in compliance with the defined in Table 5 of Rulebook on cement quality

 

Table 3 – The link between labeling of type of cement

Family of common Portland cements
Main type	Cement type	Article 16	SRPS EN 197-1
CEM I	Portland cement	PC	CEM I
CEM II	Portland-slag cement	PC 20S	CEM II/A-S
		PC 35S	CEM II/B-S
	Portland-silica fume cement	PC 20D	CEM II/A/D
	Portland-pozzolan cement	PC 20P	CEM II/A-P
		PC 35P	CEM II/B-P
		PC 20Q	CEM II/A-Q
		PC 35Q	CEM II/B-Q
	Portland-fly ash cement	PC 20V	CEM II/A-V
		PC 35V	CEM II/B-V
		PC 20W	CEM II/A-W
		PC 35W	CEM II/B-W
	Portland-burnt shale cement	PC 20T	CEM II/A-T
		PC 35T	CEM II/B-T
	Portland-limestone cement	PC 20L	CEM II/A-L
		PC 35L	CEM II/B-L
		PC 20LL	CEM II/A-LL
		PC 35LL	CEM II/B-LL
	Portland composite cement	PC 20M	CEM II/A-M
		PC 35M	CEM II/B-M
CEM III	Blast furnace cement	M 35K	CEM III/A
		M 20K	CEM III/B
		M 5K	CEM III/C
CEM IV	Pozzolanic cement	P 35	CEM IV/A
		P 55	CEM IV/B
CEM V	Composite cement	MP 30	CEM V/A
		MP 50	CEM V/B
Family of sulfate resisting common cements
CEM I	Sulfate resisting Portland cement	PC-SR 0	CEM I-SR 0
		PC-SR 3	CEM I-SR 3
		PC-SR 5	CEM I-SR 5
CEM III	Sulfate resisting blast furnace cement	M 20K-SR	CEM III/B-SR
		M 5K-SR	CEM III/C-SR
CEM IV	Sulfate resisting pozzolanic cement	P 35- SR	CEM IV/A-SR
		P 55- SR	CEM IV/B-SR
Calcium aluminate cement
Main type	Cement type	Article 13 of the Rulebook	SRPS EN 14647
-	-	AC	CAC