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首页> 外文会议>SME annual meeting and exhibit >A PRACTICAL METHOD OF MEASURING SHOTCRETE ADHESION STRENGTH
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A PRACTICAL METHOD OF MEASURING SHOTCRETE ADHESION STRENGTH

机译：一种测量胶粘强度的实用方法

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The National Institute for Occupational Safety and Health (NIOSH) is conducting research to develop safe practices for the use of shotcrete as ground support in underground mines, particularly mines operating in weak host rock. As part of this research, tests were conducted with a commercial poly-fiber reinforced shotcrete mix to develop a practical means of measuring shotcrete adhesion strength. Full-scale tests were conducted in a test frame equipped with concrete panels having three distinct surface roughness profiles. Adhesion test fixtures either embedded or epoxied in the shotcrete were overcored into the underlying concrete, and direct tensile tests were conducted to determine the bond strength of the shotcrete cores to the substrate after a selected shotcrete curing interval (1, 3, 7, 14, 28, or 90 days). Measured adhesion strengths typically ranged from 0.5 to 2.0 MPa depending on the curing age of the shotcrete samples. This paper presents the results of these tests, describes the portable test system components, and addresses some of the design issues encountered in the development of a rugged and reliable method for determining shotcrete adhesion strength in underground mines.
机译：美国国家职业安全与健康研究所（NIOSH）正在进行研究，以开发在地下矿井（特别是在弱主岩中工作的矿井）中使用喷浆混凝土作为地面支撑的安全做法。作为这项研究的一部分，对商用多纤维增强喷射混凝土混合物进行了测试，以开发一种测量喷射混凝土粘结强度的实用方法。在配备有具有三个不同表面粗糙度轮廓的混凝土面板的测试框架中进行全面测试。将嵌入或喷塑在喷浆混凝土中的附着力测试夹具压入下层混凝土中，并进行直接拉伸测试，以确定在选定的喷浆固化间隔后（1、3、7、14、14）喷浆芯与底材的粘结强度。 28天或90天）。取决于喷射混凝土样品的固化年龄，测得的粘合强度通常在0.5到2.0 MPa的范围内。本文介绍了这些测试的结果，描述了便携式测试系统的组件，并解决了在开发坚固可靠的方法来确定地下矿井中喷射混凝土附着强度时遇到的一些设计问题。

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