1.1 本试验方法包括测定模塑矩形梁形式的固化耐化学材料的弯曲强度和弯曲弹性模量。这些材料包括砂浆、砖和瓷砖灌浆、结构灌浆、机械灌浆、整体表面（60密耳或更大）和聚合物混凝土。这些材料应基于树脂、硅酸盐、二氧化硅或硫粘合剂。 1.2 矩形截面的钢筋在中心点荷载下作为简单梁进行弯曲试验:钢筋位于两个支架上，通过支架中间的加载鼻施加荷载。 1.3 方法A概述了通常用于含有尺寸小于0.2 in.（5 mm）骨料的系统的测试程序。方法B涵盖了通常用于含有0.2 尺寸为0.4英寸（10毫米）。方法C用于包含大于0的骨料的系统。 4英寸。 1.4 以英寸磅为单位的数值应视为标准。括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 4.1 该试验方法通常适用于刚性和半刚性材料。 虽然不能确定那些不断裂的材料的弯曲强度，但可以确定切线弹性模量。 4.2 通过该试验方法获得的结果应作为指导，但不是为特定应用选择耐化学材料的唯一依据。未尝试将实际使用时可能影响材料性能的所有各种因素纳入本试验方法。 4.3 除了切线弹性模量外，还计算了应力-应变（荷载-挠度）图上应变为50的点的割线模量 % 最大应变。

1.1 This test method covers the determination of flexural strength and modulus of elasticity in flexure of cured chemical-resistant materials in the form of molded rectangular beams. These materials include mortars, brick and tile grouts, structural grouts, machinery grouts, monolithic surfacings (60 mils or greater), and polymer concretes. These materials shall be based on resin, silicate, silica, or sulfur binders. 1.2 A bar of rectangular cross section is tested in flexure as a simple beam in center point loading: the bar rests on two supports and the load is applied by means of a loading nose midway between supports. 1.3 Method A outlines the testing procedure generally used for systems containing aggregate less than 0.2 in. (5 mm) in size. Method B covers the testing procedure generally used for systems containing aggregate from 0.2 in. to 0.4 in. (10 mm) in size. Method C is used for systems containing aggregate larger than 0.4 in. 1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.5 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. 1.6 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 ====== 4.1 This test method is generally applicable to rigid and semirigid materials. Although flexural strength cannot be determined for those materials that do not break, tangent modulus of elasticity can be determined. 4.2 The results obtained by this test method should serve as a guide in, but not as the sole basis for, selection of a chemical-resistant material for a particular application. No attempt has been made to incorporate into this test method all the various factors that may affect the performance of a material when subjected to actual service. 4.3 In addition to the tangent modulus of elasticity, a secant modulus is calculated at the point on the stress-strain (load-deflection) graph where the strain is 50 % of the maximum strain.