The use of nondestructive techniques in the technological control of concrete allows to evaluate and monitor the condition of the material without interfering with its properties; therefore, it is highly desirable in on-site inspections. Among these techniques, ultrasonic testing stands out as one of the most promising by its speed and simplicity to obtain results. However, inferences of strength and stiffness properties using ultrasound parameters should be made with caution, since many factors may interfere with wave propagation. This research aimed to evaluate the behavior of parameters obtained by ultrasonic testing (velocity of wave propagation [V] and stiffness coefficient [C = density × V²]) as predictors of the strength (f_c) and stiffness (E_ci) of concrete produced with coarse aggregates from different mineralogical origins. To achieve the objective, 128 specimens were produced with four aggregate mineralogical origins and four water-cement ratios, with 8 replications each. The ultrasonic tests were performed with two-frequency transducers (45 and 80 kHz). Prediction models of f_c and E_ci were statistically significant (P-value < 0,05) for both frequencies. The model using [C] as independent variable present better correlation with E_ci (R² > 91,2%) and with f_c (R² > 82%) than the model using only [V]. General regression models (regardless of the gravel type) were also statistically significant (P-value < 0.05), with R² > 79% and prediction errors higher than those obtained for the specific models for different rock types.

在混凝土技术控制中使用无损技术可以评估和监控材料的状况，而不会干扰其性能；因此，现场检查是非常可取的。在这些技术中，超声波检测因其速度快且获取结果简单而成为最有前途的技术之一。然而，使用超声参数推断强度和刚度特性时应谨慎，因为许多因素可能会干扰波传播。本研究旨在评估通过超声波测试获得的参数（波传播速度 [V] 和刚度系数 [C = 密度 × V ² ]）作为强度预测因子 (f _c ）。为了实现这一目标，生产了 128 个样本，具有四种骨料矿物学来源和四种水灰比，每个样本有 8 个复制品。超声波测试使用双频换能器（45 和 80 kHz）进行。 f _c 和 E _ci 的预测模型对于两个频率均具有统计显着性（P 值 < 0,05）。使用 [C] 作为自变量的模型与 E _ci (R ² > 91,2%) 和 f _c (R ² > 82%）比仅使用 [V] 的模型高。一般回归模型（无论砾石类型）也具有统计显着性（P 值 < 0.05），R ² > 79%，预测误差高于针对不同岩石类型的特定模型获得的预测误差。