Type I 52,5 N SR5 - Tipo I 52,5 N SR5 - Buzzi Unicem Italia

Type I 52,5 N SR5

This cement contains at least 95% clinker and up to 5% minor constituents, not including the addition of calcium sulfate and additives.

Known for its rapid early strength development and due to the low aluminate content in the clinker, this cement offers special advantages such as the high/very high resistance to sulfates, suitability for use in marine environments, and controlled development of the heat of hydration. The cement conforms to the harmonized European standard EN 197/1 and displays the CE marking as required by European regulation 305/2011 (CPR).

The designation SR means that the cement is sulfate-resistant, an additional property of the product based on the composition and performance requirements specified in tables 2 and 5 of EN 197/1.

Chemical properties

Parameter	Test method	Indicative values ⁽¹⁾	Specified characteristic limits
Sulfates (SO₃)	EN 196/2	<3,3%	<=3,5%
Chlorides (Cl^-)	EN 196/2	<0,08%	<=0,10%
Loss on ignition	EN 196/2	<5,0%	<=5,0%
Insoluble residue	EN 196/2	<2,0%	<=5%
Water-soluble chromium VI	EN 196/10	<=2 ppm	<=2 ppm

Physical/mechanical properties

Parameter	Test method	Indicative values ⁽¹⁾	Specified characteristic limits
Blaine specific surface	EN 196/6	4000/5300 cm2/g
Initial setting time	EN 196/3	>90 min	>=45 min
Volume stability	EN 196/3	<=10 mm	<=10 mm
Flow test	UNI 7044	>80%
Compressive strength after curing for	EN 196/1
2 days		>35,0 MPa	>=30,0 MPa
28 days		>55,0 MPa	>=52,5 MPa

(1) The values represent the level above (or below) the reasonably expected median values for the parameters indicated of BUZZI UNICEM cements belonging to the type and class named in the headers. These values are calculated on a yearly basis and take into account internal self-inspection data.

Current applications

Standard and non-standard reinforced concrete for works requiring significant early and final strengths
Concrete for prefabricated and/or prestressed structures, also with pre-tensioned tendons
Concrete for works requiring formwork removal shortly after pouring
Concrete for precast elements with or without accelerated curing
Concrete for works requiring resistance to aggressive environments due to chemical attack
Concrete for works requiring resistance to marine environments