EN 933-7:1998

Tests for geometrical properties of aggregates - Part 7: Determination of shell content - Percentage of shells in coarse aggregates

This European Standard specifies a method for the determination of shell content of coarse aggregates.  It applies to gravel or mixed aggregate containing gravel.  The test method specified in this part of this European Standard is applicable to particle size fractions di/Di where Di<=63 mm and di>=4 mm.  NOTE: For aggregate sizes with D > 63 mm and/or d < 4 mm the test may be carried out on particle size fractions di/Di where Di<=63 mm and di>=4 mm.

Prüfverfahren für geometrische Eigenschaften von Gesteinkörnungen - Teil 7: Bestimmung des Muschelschalengehaltes - Prozentsatz von Muschelschalen in groben Gesteinkörnungen

Dieser Teil der vorliegenden Europäischen Norm legt ein Prüfverfahren zur Bestimmung des Muschelschalengehaltes in groben Gesteinskörnungen fest. Er ist für Kies oder Mischungen von Gesteinskörnungen mit Kies anwendbar. Das in diesem Teil der vorliegenden Europäischen Norm festgelegte Prüfverfahren ist auf Kornklassen di/Di mit Di <= 63 mm und di >= 4 mm anwendbar. Anmerkung: Für Gesteinskörnungen mit Di > 63 mm und/oder d < 4 mm kann die Prüfung an Kornklassen di>Di mit Di <= 63 mm und di >= 4 mm durchgeführt werden.

Essais pour déterminer les propriétés géométriques des granulats - Partie 7: Détermination de la teneur en éléments coquilliers - Pourcentage des coquilles dans les gravillons

La présente partie de cette norme européenne décrit une méthode de détermination de la teneur en éléments coquilliers des gravillons. Elle s'applique aux gravillons alluvionnaires ou aux mélanges en contenant.  La méthode d'essai spécifiée dans la présente partie de cette norme européenne s'applique à des granulats di/Di où Di<=63 mm et di>=4mm.  NOTE : Pour les granulats ou Di> 63 mm et/ou d <4 mm l'essai peut être effectué sur la fraction di/Di ou Di<=63 mm et di>=4 mm.

Preskusi geometričnih lastnosti agregatov - 7. del: Določevanje vsebnosti školjk - Odstotek školjk v grobih agregatih

General Information

• Status: Published
• Publication Date: 17-Mar-1998
• ICS: 91.100.15 - Mineral materials and products
• Technical Committee: CEN/TC 154 - Aggregates
• Drafting Committee: CEN/TC 154/SC 6 - Test methods
• Current Stage: 9060 - Closure of 2 Year Review Enquiry - Review Enquiry
• Start Date: 02-Dec-2024
• Completion Date: 02-Dec-2024
• Directive: 305/2011 - Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec
• Directive: 89/106/EEC - Construction products
• Mandate: M/125 - Mandate to CEN/CENELEC concerning the execution of standardization work for harmonized standards on aggregates
• Ref Project: SIST EN 933-7:1999 - Tests for geometrical properties of aggregates - Part 7: Determination of shell content - Percentage of shells in coarse aggregates

Overview

EN 933-7:1998 is a European Standard developed by CEN that specifies the test method for determining the shell content in coarse aggregates. This standard focuses on measuring the percentage of shells present in gravel or mixed aggregates containing gravel. The method applies primarily to particle size fractions where the maximum particle size (Di) is less than or equal to 63 mm and the minimum particle size (di) is greater than or equal to 4 mm. The test may also be adapted for larger aggregate sizes or smaller particles by maintaining the specified size fraction limits.

This standard is critical for assessing the quality and physical properties of coarse aggregates, which directly affect the performance and durability of construction materials such as concrete and asphalt.

Key Topics

• Shell Content Determination: The process to quantify the percentage of shell fragments within coarse aggregates. Shells typically include particles with hollow or fragile outer layers that can affect aggregate strength.
• Particle Size Fractions: The method applies specifically to aggregate fractions limited to sizes between 4 mm and 63 mm to ensure consistent and reliable measurements.
• Applicability: Designed for gravel or mixed aggregates containing gravel, commonly used in construction, road building, and concrete production.
• Test Procedure: Provides a standardized approach to accurately assess geometric properties related to the shell content, ensuring reproducibility and comparability of results.

Applications

• Quality Control in Aggregate Supply: Testing shell content helps suppliers and users verify aggregate quality, ensuring compliance with construction specifications.
• Concrete and Asphalt Manufacturing: Aggregates tested according to EN 933-7 enable manufacturers to select materials with optimal mechanical properties, thereby enhancing the durability and strength of the finished products.
• Road Construction: Determining shell content is vital for specifying aggregates used in road base and surfacing layers to improve the structural integrity and longevity of pavements.
• Research and Development: Laboratories and testing facilities use this standard for analyzing new sources of aggregate materials and for investigating the influence of shell content on material behavior.

Related Standards

• EN 933 Series: Part of a wider series of standards that establish test methods for geometrical properties of aggregates including particle size distribution, shape, and other physical characteristics.
• EN 12620: Specification for aggregates for concrete, which references limits on shell content for suitable aggregate selection.
• EN 13043: Aggregates for bituminous mixtures - relates to physical and mechanical properties applicable in road construction.
• ISO 470-1: International standards for aggregate testing that may complement or align with EN 933-7 procedures.

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Keywords: EN 933-7, shell content determination, coarse aggregates testing, gravel aggregate quality, geometric properties of aggregates, percentage of shells, aggregate particle size, construction materials testing, CEN standards, aggregate quality control.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-1999
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2GVWRWHNãNROMNYJURELKDJUHJDWLK
Tests for geometrical properties of aggregates - Part 7: Determination of shell content -
Percentage of shells in coarse aggregates
Prüfverfahren für geometrische Eigenschaften von Gesteinkörnungen - Teil 7:
Bestimmung des Muschelschalengehaltes - Prozentsatz von Muschelschalen in groben
Gesteinkörnungen
Essais pour déterminer les propriétés géométriques des granulats - Partie 7:
Détermination de la teneur en éléments coquilliers - Pourcentage des coquilles dans les
gravillons
Ta slovenski standard je istoveten z: EN 933-7:1998
ICS:
91.100.15 Mineralni materiali in izdelki Mineral materials and
products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali d
...