CEN/TC 104/WG 10 - Sprayed concrete

This document specifies methods (Methods A and B) for the determination of the first peak, ultimate and residual strength of specimens of hardened sprayed concrete.

This document is applicable to sprayed concrete to be used for repair and upgrading of structures, for new structures and for strengthening of ground.
This document covers:
-   classification related to consistence of wet mix;
-   environmental exposure classes; young, hardened and fibre reinforced concrete;
-   requirements for constituent materials, for concrete composition and for basic mix, for fresh and hardened concrete and all types of fibre reinforced sprayed concrete;
-   specification for designed and prescribed mixes;
-   conformity.
This document is applicable to wet mix as well as dry mix sprayed concrete. The substrates to which sprayed concrete can be applied include:
-   ground (rock and soil);
-   sprayed concrete;
-   different types of formwork;
-   structural components constituted of concrete, masonry and steel;
-   drainage materials;
-   insulating materials.
Additional or different requirements may be needed for applications not within this document, for instance-refractory uses.

This European Standard describes a means of determining the tensile bond between sprayed concrete and substrate of concrete or rock tested in a laboratory as a direct tension test. Bond strength is defined as the capacity to transfer tension between two layers. Bond strength is calculated as the ultimate tensile force divided by the stressed cross-sectional area of a core, drilled out of a sprayed concrete layer together with a portion of the substrate concrete or rock.
Alternative in situ test methods for determining bond strength are allowed provided they meet all the requirements of this European Standard. In case of dispute, the method described in this European Standard is the reference test method.

This European Standard specifies a method for obtaining samples of fresh or hardened (i.e. before or after set) sprayed concrete, depending on the property to be measured and its associated test method.

This European Standard is applicable to sprayed concrete to be used for ground strengthening, repair and upgrading of existing structures and for free-standing structures.
The standard specifies requirements for the execution of concrete spraying both by wet and dry process.
The standard is applicable to temporary as well as permanent structures.
This standard does not cover safety and health aspects of execution.
This standard does not state requirements for quality assurance and for qualification of personnel for the various activities.

This part specifies two methods from which an estimate of the in situ compressive strength of young hardened sprayed concrete can be made

This standard describes methods for the determination of the thickness of sprayed concrete on a substrate after spraying. The results can also give an indication of the parallelism of the concrete to the substrate. The substrate may be rock, soil, concrete or other surface.

This part of European Standard specifies a method for the determination of the load/deflection response of a slab specimen in order to calculate the energy absorption capacity up to a specified deflection.

This part of European Standard specifies a method for the determination of the fibre content of sprayed concrete from either a fresh or hardened (i.e. before or after set) concrete sample. Only the method using a fresh sample is appropriate with polymer fibres, while both types are applicable with steel fibres.

Modifications to German title, Scope and 5.2

This part of European Standard specifies a method for the determination of the flexural (first peak, ultimate and residual) strength of beam specimens of hardened sprayed concrete.

This European Standard is applicable to sprayed concrete, to be used for repair and upgrading of structures, for new structures and for strengthening of ground.
This European Standard covers:
¾   classification related to consistence of wet mix;
¾   environmental exposure classes; young, hardened and fibre reinforced concrete;
¾   requirements for constituent materials, for concrete composition and for basic mix, for fresh and hardened concrete and all types of fibre reinforced sprayed concrete;
¾   specification for designed and prescribed mixes;
¾   conformity.
This European Standard is applicable to wet mix as well as dry mix sprayed concrete.
The substrates to which sprayed concrete can be applied include:
¾   ground (rock and soil);
¾   sprayed concrete;
¾   different types of formwork;
¾   structural components constituted of concrete, masonry and steel;
¾   drainage materials;
¾   insulating materials.
Additional or different requirements may be needed for applications not within this document, for instance-refractory uses.

This European Standard describes a means of determining the tensile bond between sprayed concrete and substrate of concrete or rock tested in a laboratory as a direct tension test. Bond strength is defined as the capacity to transfer tension between two layers. Bond strength is calculated as the ultimate tensile force divided by the stressed cross-sectional area of a core, drilled out of a sprayed concrete layer together with a portion of the substrate concrete or rock.