1.1 本试验方法包括测定砌块的劈裂抗拉强度。 1.2 单位- 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值可能不是精确的等效值；因此，每个系统应相互独立使用。将两个系统的值合并可能会导致不符合标准。 1.3 本标准的文本引用了提供解释材料的注释和脚注。这些注释和脚注（不包括表和图中的注释和脚注）不应视为本标准的要求。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 当受压破坏时，单独和组合内的砌块通常以拉伸模式破坏。这些拉伸应力是由砌块和砂浆之间的弹性模量和泊松比的差异引起的。此外，在荷载作用下，砌块芯内灌浆行为的不同会导致砌块内的拉应力，并导致劈裂破坏。 5.2 该试验方法沿砌块床面产生线荷载。通过支承杆施加在装置上的压缩载荷导致拉伸应力分布在装置分裂长度的装置高度上。该试验方法可在杆朝向床面纵向或横向的情况下进行。劈裂抗拉强度通过以下公式计算: 10.1 . 5.3 测试值提供了砌块劈裂抗拉强度的指标。此外，可能会发现砌块中存在缺陷，例如可见的孔隙或杂质。 5.4 试样的含水量会影响测试结果。 5.5 试样的高度会影响测试结果。

1.1 This test method covers the determination of the splitting tensile strength of masonry units. 1.2 Units— The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.3 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 Masonry units alone and within assemblages commonly fail in a tensile mode when loaded in compression to failure. These tensile stresses result from differences in modulus of elasticity and Poisson's ratio between the masonry unit and mortar. Additionally, the dissimilarity in behavior of the grout within cores of masonry units under load leads to tensile stresses in the units and results in a splitting failure. 5.2 This test method produces a line load along the bed surface of the masonry unit. The compressive load applied to the unit, imposed by means of bearing rods, results in a tensile stress distributed over the height of the unit for the split length of the unit. This test method can be conducted with the rod oriented either in the longitudinal direction or in the transverse direction of the bed face. The splitting tensile strength is calculated by the equation given in 10.1 . 5.3 The test value provides an indicator of masonry-unit splitting tensile strength. Additionally, the presence of defects such as visible voids or impurities in masonry units may be revealed. 5.4 The moisture content of the specimen will affect test results. 5.5 The height of the specimen will affect test results.