依据针贯入法的检测原理,分别对C30~C70混凝土强度和贯入深度进行了试验研究。在试验研究的基础上,对试验数据采用不同类型的曲线进行了拟合,且进行对比分析,发现贯入深度与混凝土强度为非线性的指数函数关系。进一步探讨该测强曲线的精度是否满足混凝土幼龄期强度和高强混凝土的测定及验证性检测。 According to the principle of needle penetration method, the strength and penetration depth of C30 ~ C70 concrete were studied respectively. Based on the experimental study, the test data were fitted with different types of curves, and comparative analysis was carried out. The relationship between penetration depth and the strength of concrete is nonlinear exponential function. To further explore whether the accuracy of the strength curve meets the concrete strength and young age of concrete testing and confirmatory test.