prEN 12350-10
(Main)Testing fresh concrete - Part 10: Self-compacting concrete - L box test
Testing fresh concrete - Part 10: Self-compacting concrete - L box test
The document specifies the procedure for determining the passing ratio, using the L-box test, for self-compacting concrete.
Prüfung von Frischbeton - Teil 10: Selbstverdichtender Beton - L-Kasten-Versuch
Essai pour béton frais - Partie 10 : Béton auto-plaçant - Essai à la boîte en L
Preskušanje svežega betona - 10. del: Samozgoščevalni beton - Preskus z L-zabojem
General Information
- Status
- Not Published
- Technical Committee
- CEN/TC 104 - Concrete ( performance, production, placing and compliance criteria )
- Drafting Committee
- CEN/TC 104/SC 1 - Revision of ENV 206
- Current Stage
- 4098 - Decision to abandon - Enquiry
- Start Date
- 07-Aug-2009
- Completion Date
- 07-Aug-2009
- Directive
- 89/106/EEC - Construction products
Overview
prEN 12350-10 (CEN draft) defines the L-box test procedure for assessing the passing ability of fresh self‑compacting concrete (SCC). The L-box test measures how well SCC flows horizontally through narrow openings and between reinforcing bars without segregation or blocking. The standard is part of the EN 12350 series on testing fresh concrete and was prepared by CEN/TC 104.
Key topics and requirements
- Scope: Procedure to determine the passing ability ratio (PA) for SCC using the L-box.
- Principle: A measured volume of SCC flows from a vertical hopper through bar spacings into a horizontal section; heights are measured and the ratio PA = H2 / H1 is calculated.
- Apparatus:
- L-box with smooth, rigid surfaces; vertical hopper volume ~12.7 ±0.1 L.
- Smooth steel bars 12 ±0.2 mm diameter; two‑bar gap = 59 ±1 mm (two-bar test) and three‑bar gap = 41 ±1 mm (three-bar test) to simulate different reinforcement congestion.
- Rule/tape (min. 500 mm, 1 mm divisions), spirit level, straight edge, containers (≥14 L).
- Sample & procedure:
- Sample size ≥14 L (EN 12350‑1 sampling).
- L-box placed level, dampened (not wet); gate closed; fill hopper and strike off level.
- Allow to stand (60 ±10) s, open gate and let concrete flow.
- Measure height drops at three equally spaced points in vertical and horizontal sections; calculate mean depths H1 (vertical) and H2 (horizontal).
- Result & reporting:
- Passing ability ratio PA = H2 / H1 (reported to nearest 0.05).
- Test report must record identification, location, date/time, two/three-bar choice, observed segregation/bleeding, PA, concrete age, deviations and a responsible declaration. Optional: temperature.
- Precision:
- Repeatability and reproducibility values determined by inter-laboratory trials (examples: r ≈ 0.11–0.13, R ≈ 0.12–0.16 depending on PA).
Applications and users
- Used by: concrete technologists, testing laboratories, contractors, quality control/assurance teams, structural engineers and specifiers.
- Practical uses:
- Verify SCC mix designs for adequate passing ability before casting around congested reinforcement.
- Compare two‑bar vs three‑bar performance to simulate varying reinforcement densities.
- Support acceptance testing, QC checks on-site or in the laboratory and R&D of SCC mixtures.
Related standards
- EN 12350 series (fresh concrete testing): Part 1 (Sampling), Part 8 (Slump‑flow), Part 9 (V‑funnel), Part 11 (Sieve segregation), Part 12 (J‑ring), etc.
- ISO 5725 (precision of test methods) referenced for repeatability/reproducibility assessment.
Keywords: prEN 12350-10, EN 12350-10, L-box test, self-compacting concrete, SCC, passing ability, fresh concrete testing, CEN, workability.
Frequently Asked Questions
prEN 12350-10 is a draft published by the European Committee for Standardization (CEN). Its full title is "Testing fresh concrete - Part 10: Self-compacting concrete - L box test". This standard covers: The document specifies the procedure for determining the passing ratio, using the L-box test, for self-compacting concrete.
The document specifies the procedure for determining the passing ratio, using the L-box test, for self-compacting concrete.
prEN 12350-10 is classified under the following ICS (International Classification for Standards) categories: 91.100.30 - Concrete and concrete products. The ICS classification helps identify the subject area and facilitates finding related standards.
prEN 12350-10 is associated with the following European legislation: EU Directives/Regulations: 305/2011, 89/106/EEC. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
prEN 12350-10 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2008
3UHVNXãDQMHVYHåHJDEHWRQDGHO 6DPR]JRãþHYDOQLEHWRQ3UHVNXV]/
]DERMHP
Testing fresh concrete - Part 10: Self-compacting concrete - L box test
Prüfung von Frischbeton - Teil 10: Selbstverdichtender Beton - L-Kasten-Versuch
Essai pour béton frais - Partie 10 : Béton auto-plaçant - Essai a la boîte en L
Ta slovenski standard je istoveten z: prEN 12350-10
ICS:
91.100.30
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
DRAFT
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2007
ICS 91.100.30
English Version
Testing fresh concrete - Part 10: Self-compacting concrete - L
box test
Essai pour béton frais - Partie 10 : Béton auto-plaçant - Prüfung von Frischbeton - Teil 10: Selbstverdichtender
Essai à la boîte en L Beton - L-Kasten-Versuch
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 104.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other language
made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the
same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12350-10:2007: E
worldwide for CEN national Members.
Contents Page
Foreword.3
1 Scope .4
2 Normative references .4
3 Principle.4
4 Apparatus .4
4.1 L-box .4
4.2 Rule or measuring tape.4
4.3 Containers .4
4.4 Spirit level.5
4.5 Straight edge.5
5 Test sample .6
6 Test procedure.6
7 Test result.7
8 Test report .7
9 Precision.7
Foreword
This document (prEN 12350-10:2007) has been prepared by Technical Committee CEN/TC 104 “Concrete
and related products”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This standard is based on the results from the EU-project “Testing-SCC” under the 5th Frame Programme
(GRD2-2000-30024/G6RD-CT-2001-00580).
Owing to its significant advantages in the improvement of construction quality and working environment, self-
compacting concrete (SCC) has been more widely accepted by the construction owners. The use of SCC in
practical concrete construction is stably increasing. Since SCC has to give satisfactory in-situ properties
(perfect filling of the mould and embedment of the reinforcement, homogeneity and full compaction) without
vibration, the proper methods for testing the workability of fresh SCC are very important. The workability of
fresh SCC should basically include three key properties: filling ability, passing ability and resistance to
segregation. It is desirable, especially in the case of new constituents or new concrete compositions, to test
the workability of fresh SCC before casting in place.
A number of test methods are available for testing fresh SCC. Most of the commonly used test methods were
evaluated in the recently closed EU-project “Testing-SCC” under the 5th Frame Programme (GRD2-2000-
30024/G6RD-CT-2001-00580). According to the results from this EU project, it seems no single test method
can completely cover all the three key properties. Nevertheless any test method should at least be correlated
to the practical situation and give consistent results in order to provide reliable data for judgment of concrete
workability.
This standard is one of a series concerned with testing fresh concrete.
This series EN 12350 includes the following parts.
EN 12350, Testing fresh concrete
— Part 1: Sampling;
— Part 2: Slump test;
...
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