Effect of Microfillers on Selected Destructive and Nondestructive Mechanical Properties of Cement Mortars: Different Types of Recycled Materials

The paper presents the use of non-destructive testing to determine the evolution of mechanical properties. For testing, we used the resonance method. The measuring device of company Brüel&Kjær was used. Specifically, evolution of dynamic modulus of elasticity (determined from the longitudinal and transverse vibration) and the shear modulus was determined for the first 28 days after production of the samples. The results of non-destructive method were also used for verifying the relevance of the results of destructive testing, specifically the results of the compressive strength and a three-point flexural strength. Testing of mechanical properties was performed on samples of cement mortars, where the micronized recycled concrete and micronized marble powder were used as microfillers, both materials were prepared on a high-speed mill of the Lavaris company (Czech Republic).