СТБ EN 1052-1-2009
1. Scope
This European Standard specifies a method for determining the compressive strength of masonry. Guidance is given on the preparation of the specimens, the conditioning required before testing, the testing machine, the method of test, the method of calculation and the contents of the test report.
2. Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. prEN 772-1 Methods of test for masonry units - Part 1: Determination of compressive strength, prEN 772-10 Methods of test for masonry units - Part 10: Determination of moisture content of calcium silicate and autoclaved aerated concrete masonry units, prEN 998-2 Specification for mortar for masonry - Part 2: Masonry mortar, prEN 1015-3 Methods of test for mortar for masonry - Part 3: Determination of consistence of fresh mortar (by flow table), prEN 1015-7 Methods of test for mortar for masonry - Part 7: Determination of air content of fresh mortar, prEN 1015-11 Methods of test for mortar for masonry - Part 11: Determination of flexural and compressive strength of hardened mortar.
3. Principle
The compressive strength of masonry perpendicular to the bed joints is derived from the strength of small masonry specimens, tested to destruction. The materials, construction and bonding pattern should correspond to those used in practice. The specimens are loaded uniformly in compression. The maximum load (Fmax) achieved is recorded. The characteristic compressive strength of the masonry is derived from the strengths of the individual specimens. If the units, or the mortar, do not achieve the exact strengths specified, then it is permissible to adjust the measured values in accordance with Annex A within the specified range. Any such adjustment should be clearly indicated in the test report.
4. Definitions and symbols
4.1 Definitions. For the purpose of this standard the following definitions apply: 4.1.1 masonry: An assemblage of masonry units laid in a specified bonding pattern and jointed together with mortar. 4.1.2 compressive strength of masonry: The strength of masonry in compression without the effects of loading restraint, slenderness or eccentricity of loading. 4.2 Symbols. Ai is the loaded cross-section of an individual masonry specimen, (mm2). E is the mean modulus of elasticity, (N/mm2). Документ показан в сокращенном демонстрационном режиме
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