BS 8539-2012 pdf free download

BS 8539-2012 pdf free download.Code of practice for the selection and installation of post-installed anchors in concrete and masonry.
5.3.3.3 Masonry COMMENTARY ON 5.3.3.3
The term “masonry” covers all constructions built from masonry units and bonded together via mortar joints, including brickwork, block work and stonework. It can be an unpredictable material to fix into. The strength can vary from as low as
1.8 N/mm2 (aerated blocks) to 90 N/mm2 (engineering bricks). Masonry units can be solid or have perforations, and the mortar might be weak or non-existent in parts of the joints.
Product certificationhinspectioraftesting. Users of this British Standard are advised to consider the desirability of selecting anchors with a European Technical Approval (ETA) . Annex D, Figure D.2 shows the selection process for anchors in masonry with and without an ETA.
5.3.3.3.1 General
Specifiers should select anchors proven to be able to function reliably in the type of masonry for which the application is intended.
NOTE 1 Plastic anchors conforming to ETAG 020 (71 are suitable only for multiple use (statically indeterminate applications). Part 3 relates to plastic anchors used in solid masonry structures and Part 4 is for plastic anchors used in hollow or perforated masonry structures. Bonded anchors conforming to ETAG 029 (151 are suitable for use in applications that are both statically determinate and indeterminate, in masonry which is (depending on the scope of ETA gained) solid, hollow or perforated. Other anchors might also be approved by the manufacturer as being suitable.
Injection-type bonded anchors are particularly suitable for use in masonry as they exert no expansion stresses in the base material. They will also fill any small voids present.
Where suitable anchors conforming to an ETAG are available and the masonry of a particular project falls within the general category of the masonry type referred to in the ETA but does not conform to the dimensions and/or strength of the defined masonry type, then tests should be carried out on site to determine the allowable resistance (see 9.2a)J. Where an anchor is being considered which does not conform to an ETAG (or which does conform to an ETAG but is not qualified for the category of masonry used on the project) and no published recommended resistance is available, then the tests called up in 9.2b) should be carried out to determine the allowable resistance. The project documentation should clearly state which tests have been used.
NOTE 2 Details of appropriate test regimes are given in Annex B.BS 8539-2012 pdf free download.