Betong och betongprodukter

Ämnesområden: Betong och betongprodukter
Kommittébeteckning: SIS/TK 556 (Betongkonstruktioner)
Källa: CEN
Svarsdatum: den 25 okt 2018
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This document specifies requirements for polymer fibres for structural or non-structural use in concrete, mortar and grout. It covers fibres intended for use in all types of concrete and mortar, including sprayed concrete, flooring, precast, in-situ and repair concretes.

Provisions governing the application of polymer fibres in the production of fibre reinforced concrete or mortar elements, i. e. requirements concerning fibre content, structural design, mixing, placing, etc. of concrete including polymer fibres are not part of this standard.

NOTE Structural use of fibres is where the addition of fibres is designed to contribute to the load bearing capacity of a concrete or mortar element, see 3.18.

Ämnesområden: Betong och betongprodukter
Kommittébeteckning: SIS/TK 146 (Korrosion)
Källa: CEN
Svarsdatum: den 4 nov 2018
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This document specifies a procedure for carrying out impressed current electrochemical chloride extraction from chloride bearing concrete in existing structures. It is applicable to atmospherically exposed parts of structures with ordinary reinforcement and/or post-tensioned tendon ducts embedded in concrete. In the latter case, it is essential to verify that there is no risk of hydrogen embrittlement, if necessary by conducting trials and installing monitoring during the treatment.

This document does not apply to concrete containing pre-stressing steel which can suffer hydrogen embrittlement during chloride extraction, or to concrete containing epoxy-coated or galvanized reinforcement.

In case of post-tensioned, pre-stressing concrete, the endangered tendon strands may be shielded by the tendon ducts from unwanted and/ or exceeded polarization into the cathodic range and respective water reduction.