EN 1739:2007 – Determination of shear strength for in-plane forces of joints between prefabricated components of autoclaved aerated concrete or lightweight aggregate concrete with open structure
1 Scope
This European Standard specifies methods of determining the shear strength for in-plane forces of joints between prefabricated components made of autoclaved aerated concrete (AAC) according to prEN 12602 or lightweight aggregate concrete with open structure (LAC) according to EN 1520.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 678, Determination of the dry density of autoclaved aerated concrete
EN 679, Determination of the compressive strength of autoclaved aerated concrete
EN 992, Determination of the dry density of lightweight aggregate concrete with open structure
EN 1353, Determination of moisture content of autoclaved aerated concrete
EN 1354, Determination of compressive strength of lightweight aggregate concrete with open structure
3 Principle
The shear strength for in-plane forces of longitudinal joints between two adjacent prefabricated AAC- or LAC-components or sections thereof is determined by applying an in-plane shear force parallel with to the joint.
The load is increased continuously or in steps until failure of the joint. The load-displacement diagram and the failure load are determined. The shear strength is determined from the failure load.
4 Apparatus
a) saw for cutting components and test specimens;
b) compression testing machine or a hydraulic jack, capable of applying a compressive load without shock continuously or in steps. The precision of the compression testing machine or of the hydraulic jack and of the load indication shall be such that the failure load can be determined to an accuracy of ± 3 %. The measuring range shall be such that the failure load is higher than one-tenth of the range used;
c) callipers and/or rule, capable of measuring the dimensions of the test specimens and the joints to an accuracy of 1 mm;
d) loading frame and/or devices (e.g. steel plates, flat steel bars, steel rollers, soft fibre board) according to Figures 1, 2, 3 or 4 (or Figures 5 or 6, for alternative tests) for transmitting the load and support reactions to the test specimen;
e) dial gauge or a displacement transducer with a reading accuracy of 0,01 mm for measuring the relative displacement between the loaded and the supported part of the test specimen.
EN 1739:2007 – Determination of shear strength for in-plane forces of joints between prefabricated components of autoclaved aerated concrete or lightweight aggregate concrete with open structure