简述了使用低压夹具测试型砂低湿压强度的试验方法和原理。着重分析低压夹具曲杆工作的力学原理,指出该测试原理中的理论错误。对我国GB2684-81标准中规定的低湿压强度测试标准方法与美国A FS试验方法进行了分析对比,指出两者间的差异。提出了修改低湿压强度测试方法和使用夹具的意见。 The test method and principle of using low pressure fixture to test the low compressive strength of sand are described. Emphasis is placed on analyzing the mechanics principle of the work of the low-voltage clamp crank and pointing out the theoretical error in the test principle. Analyzed and contrasted the standard method of testing low-wet-compressive strength specified in GB2684-81 of our country with the test method of AFS in the United States, and pointed out the difference between them. Proposed to modify the low wet strength test methods and the use of jigs.