1.1 本试验方法包括测定水硬性水泥砂浆的弯曲强度。 1.2 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.3 以国际单位制为单位的数值应通过以国际单位制为单位的测量或通过适当的转换获得，使用中给出的转换和舍入规则 IEEE/ASTM SI 10 ，以其他单位进行的测量。 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。 ( 警告- 新鲜的水硬性胶结混合物具有腐蚀性，长时间接触可能会导致皮肤和组织化学烧伤。 2. ) 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 本试验方法提供了测定水硬性水泥砂浆弯曲强度的方法。 根据本试验方法进行弯曲试验的砂浆棱柱部分可用于根据试验方法测定抗压强度 C349 . 5.2 根据本试验方法确定的值仅用于研究或参考目的，不用于确定是否符合规范要求。

1.1 This test method covers the determination of the flexural strength of hydraulic-cement mortars. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 Values in SI units shall be obtained by measurement in SI units or by appropriate conversion, using the Rules for Conversion and rounding given in IEEE/ASTM SI 10 , of measurements made in other units. 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. ( Warning— Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure. 2 ) 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 This test method provides a means for determining the flexural strength of hydraulic cement mortars. Portions of the mortar prisms tested in flexure in accordance with this test method may be used for the determination of compressive strength in accordance with Test Method C349 . 5.2 The values are determined from this test method for research or reference purposes only and are not used for determining compliance with specification requirements.