Betong och betongprodukter

Kommittébeteckning: SIS/TK 254 (Järnvägar)
Källa: CEN
Svarsdatum: den 7 feb 2019
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This part of the EN 13230 series defines additional technical criteria and control procedures as well as specific tolerance limits related to manufacturing and testing prestressed bearers for switches and crossings with a maximum length of 8,5 m. Bearers longer than 8,5 m are considered as special elements and will comply with FprEN 13230 5:2015.

Ämnesområden: Betong och betongprodukter
Kommittébeteckning: SIS/TK 190 (Betong)
Källa: ISO
Svarsdatum: den 5 mar 2019
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This document gives the test method for determination of ten percent fines value (TFV) of aggregates. This method gives a relative measure of the resistance of the aggregate crushing under the gradually applied compressive load.

It covers two sets of procedures: The first procedure is applicable for aggregates tested in dry condition and the second procedure is applicable for aggregates tested in a soaked condition.

NOTE Generally, the test may be done under dry conditions. However, the engineer in charge may choose to test them in soaked condition, if required.

The test can be carried out on aggregates of different strengths covering both weak and strong aggregates.

The test is carried out on a standard size of aggregates, i.e., passing a 14.0 mm test sieve and retained on 10.0 mm test sieve. The aggregate size fraction taken for this test may also be as per relevant national standards. In case this definite size fraction is not available, the test may be made on other sizes, given in Annex A. The comparison of results of non standard sizes with standard size aggregates is not possible due to lack of available data.

NOTE : Minor variations in grading divisions may be permitted in accordance with the respective national standards.

Kommittébeteckning: SIS/TK 556 (Betongkonstruktioner)
Källa: ISO
Svarsdatum: den 11 mar 2019
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This part of ISO 10406 specifies test methods applicable to unidirectional carbon fibre-reinforced polymer (CFRP) strips as external-bonded reinforcements on the concrete substrate. This standard shall be applicable for the CFRP strips that consist of carbon fibre and thermoset resin, manufactured by pultrusion method, has a higher carbon fibre fraction such as over 60 percent and whose thickness is within 3 mm. Also, the test piece for determining tensile properties shall be cut down from CFRP strips along to CFRP strips axis and have bonded anchorage block at the both ends of the test piece.