The classical pull-off test indicates that the compressive strength of concrete increases with its tensile strength. But it is difficult to obtain the effective data due to the loading eccentricity, which could produce combined bending plus axial stress instead of the uniaxial tension. The objective of this study is to introduce a modified pull-off testing method (MPTM) and improve the classical method by using a cup-shaped loading probe, so that the tensile strength of concrete can measured under pure axial-load. Experimental results indicate that several influential factors upon the MPTM strength could be excluded. There is a good relationship between the MPTM strength and the concrete cube strength (10–80 MPa) both at early age and later age. The repeatability of the MPTM is slightly better than the classical pull-off test method. The verification investigation shows that the MPTM provides a more accurate estimate of in-place cube strength and is easier to perform than the core-drilling method.

经典的拉拔试验表明，混凝土的抗压强度随抗拉强度的增加而增加。但是由于加载偏心率很难获得有效的数据，这可能会产生弯曲加轴向应力的组合，而不是单轴拉伸。这项研究的目的是介绍一种改进的拉拔试验方法（MPTM），并通过使用杯形载荷探针来改进经典方法，以便可以在纯轴向载荷下测量混凝土的抗拉强度。实验结果表明，可以排除一些影响MPTM强度的因素。在早期和后期，MPTM强度与混凝土立方体强度（10-80 MPa）之间都有良好的关系。MPTM的可重复性比经典的拉拔测试方法稍好。