1.1 本试验方法包括通过测定烘干砖砂浆接缝在室温下的弯曲强度（断裂模量）来测定气凝耐火砂浆的粘结强度。 1.2 以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.3 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。 1.4 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====== 3.1 通过该试验方法得出的数据显示了不同质量的气凝砂浆的粘结强度和固有强度。本试验方法中描述的程序测量了与特定品牌或大量耐火砖一起使用时，气凝砂浆的粘结强度和固有强度。 3.2 请注意，对于在高温下不兼容使用的砖和砂浆组合，可以使用这些方法获得结果。用户必须确定此兼容性。只有已知或打算兼容特定用途的砖和砂浆组合才应进行测试。 3.3 砖的特性，包括其强度、表观孔隙率和孔径分布，可能会影响砖的粘结强度的测量- 砂浆的组成和砂浆的内在强度。试验砖的平均断裂模量，由试验方法确定 C133 ，应超过测试砂浆的预期值。最好测试特定品牌或大量的砖和砂浆。 3.4 有三种失效模式:破裂可能发生在砖内部、砖-砂浆界面或砂浆内部。后者提供了砂浆本身强度的实际测量，是所述四点弯曲试验的主要失效模式。三点弯曲试验测量砖-砂浆复合材料的破坏强度。砖本身内部的失效表明，特定砖包含严重缺陷，或者砂浆接缝强度与耐火砖的强度相同或更大。 故障模式应始终在最终报告中报告。 3.5 本试验方法的耐久性试验 3. 1985年进行的试验发现以下变量较为粗糙:试样尺寸（2.5至3.0英寸），砂浆表面（切割与未切割），接缝厚度( 1. / 16 到 1. / 8. 英寸），牵引杆（快速与慢速）、加载速率（500至1000 lbf/min）、加载方法（三点与四点）和操作员。 3.6 通过本试验方法获得的耐火砂浆的冷粘结强度适用于研究和开发、质量控制，以及建立和评估生产商和消费者之间的规范合规性。

1.1 This test method covers the determination of the bonding strength of air-setting refractory mortar by determining the flexural strength (modulus of rupture) at room temperature of oven-dried brick-mortar joints. 1.2 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. 1.3 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. 1.4 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 ====== 3.1 The data developed by this test method show the bonding strength and intrinsic strength of different qualities of air-setting mortar. The procedures described in this test method measure the bonding strength and intrinsic strength of air-setting mortars when used with specific brands or lots of refractory brick. 3.2 Note that it is possible to obtain results with these methods for brick and mortar combinations which are incompatible for use at high operating temperatures. The user must determine this compatibility. Only brick and mortar combinations known or intended to be compatible for a particular use should be tested. 3.3 Properties of the brick, including its strength, apparent porosity, and pore size distribution, can affect the measurement of both the bonding strength of the brick-mortar composite and the intrinsic strength of the mortar. The average modulus of rupture of the test brick, as determined by Test Methods C133 , should exceed that expected for the mortar being tested. The testing of specific brands or lots of brick and mortar is preferred. 3.4 Three modes of failure are available: the break may occur within the brick itself, at the brick-mortar interface, or within the mortar itself. The latter provides a practical measurement of the strength of the mortar itself and is the predominant mode of failure with the four-point flexure test described. The three-point flexure test measures the failure strength of the brick-mortar composite. Failure within the brick itself suggests that either the particular brick contained a serious flaw, or that the mortar joint strength is of the same magnitude or greater than that of the refractory brick. The mode of failure should always be reported in the final report. 3.5 A ruggedness test for this test method 3 performed in 1985 found the following variables to be rugged: specimen size (2.5 to 3.0 in.), mortared surface (cut versus uncut), joint thickness ( 1 / 16 to 1 / 8 in.), pulling of rods (fast versus slow), the loading rate (500 to 1000 lbf/min), the method of load application (three- versus four-point), and the operator. 3.6 The cold bonding strengths of refractory mortars obtained by this test method are suitable for use in research and development, quality control, and for establishing and evaluating compliance with specifications between producers and consumers.