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Concrete Repair According to the new Concrete European Standard EN 1504
Er. Er. Devinder Devind er Chawla Cha wla Managing Director
European standard EN 1504 The European standard EN 1504 is entitled: Products and systems for the repair and protection of concrete structures. EN 1504 is aimed at all those involved with the repair of concrete. For the first time in the industry, industry, EN 1504 deals with all aspects of the repair and / or protection process including: – –
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definitions and repair principles; the need for accurate diagnosis of deterioration causes before specification of the repair method; detailed understanding of the needs of the client; product performance requirements and test methods; factory production control and evaluation of conformity, including CE marking site application methods and quality control of the Works
European standard EN 1504 The European standard EN 1504 is entitled: Products and systems for the repair and protection of concrete structures. EN 1504 is aimed at all those involved with the repair of concrete. For the first time in the industry, industry, EN 1504 deals with all aspects of the repair and / or protection process including: – –
– – –
–
definitions and repair principles; the need for accurate diagnosis of deterioration causes before specification of the repair method; detailed understanding of the needs of the client; product performance requirements and test methods; factory production control and evaluation of conformity, including CE marking site application methods and quality control of the Works
EN 1504 – The Documents The European Standards EN 1504 consist of 10 parts.
PARTS OF BS EN 1504
IMPORTANCE OF BS EN 1504 •
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Protection, repair and reinforcement (i.e. rehabilitation) of concrete structures requires relatively complicated design, dimensioning and control. The series of CEN standards under EN 1504 defines the principles of rehabilitation of concrete structures, which are damaged. These standards specify guidelines for the choice of repair materials and systems that are appropriate for rehabilitation and maintenance of concrete structures. These standards describe the main points of rehabilitation of a damaged concrete structure:
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Assessment of the registered state of a concrete structure
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Determination of the courses of damage
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Determination of the objective of the rehabilitation of a damaged concrete structure concrete structure or its members
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Specification of requirements for the maintenance that should always follow rehabilitation of a damaged concrete structure or its
EN 1504 -REVIEW •
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Part 1 only reports introductory definitions, while Parts 8 and 10 concern quality control and site application. Parts 2-7 describe the products and systems suggested for the repair and protection of the concrete structures. Part 9 reports the general principles and the methods for the use of such products and systems.
Design Philosophy Specifying to BS EN 1504 Part 9 of BS EN 1504 outlines a structured approach to the investigation of the causes of defects in concrete and explains the 11 Principles of remedial action which clients and designer/specifiers should use to prepare their specification. The system of options, principles and methods is the basis for the selection of products and Designers can make optimal use of the repair principles to find the most appropriate action taking into account health and safety, structural and environmental factors.
BS ENV 1504-9 General Principles for the Use of Products and Systems
BS DDENV 1504 defines the principles for protection and repair of concrete structures which have suffered or may suffer damage or deterioration The standard also provides guidance on the key stages in the repair and protection process 1. Assessment of defects 2. Identification of the causes of defects 3. Objectives of protection and repair 4. Selection of the appropriate principles and methods 5. Properties of products and systems (1504 parts 2-7) 6. Maintenance management
ENV 1504, Part 9 – Basic considerations •
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This part of the EN 1504 specifies the basic principles which shall be used, separately or in combination, where it is necessary to protect or repair concrete structures, above or below ground or water. Successful repair of a structure starts with a correct condition assessment and identification of the cause of degradation. All other stages in the repair and protection process depend on these matters. The methods for the repair and protection of concrete structures detailed in ENV 1504, part 9 are grouped in 11 principles which relate to –
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degradation of the concrete matrix, or defects caused by reinforcement corrosion membranes
The 11 Principles for concrete repair and rehabilitation (BS EN 1504-9 )
SKETCH SHOWING ALL 11 PRINCIPLES AT ONE LOCATION
Systematics of planning according to EN 1504-9
FLOW CHART FOR REPAIR
Decision Making Tree
The phases of repair projects
Structural and Non-structural repair (BS EN 1504-3) Range of different mortars has been developed to provide appropriate solutions to the wide variety of problems resulting in defective concrete. These pre-bagged single component products are available in the 4 different classes specified in BS EN 1504 for structural and non structural concrete repair products:
This basic classification is by compressive strength, however additional test data is required for each product depending on the application for which it is being used.
