All the flexural tests, three-point bending test, were conducted at room temperature (20°C). The support length was adapted to the size of sample, and at least seven specimens were tested for each mix under study. A total of 105 tensile tests were therefore conducted both with the fibrous and nonfibrous samples and the mechanical properties determined from these tests included the flexural modulus, the ultimate stress, and the ultimate strain (see Table 4.3 and Fig. 4.1).
After breaking samples by the three-point bending test, both halves were used to determine compressive strength and a total of 210 compressive strength tests were carried out (see Table 4.3 and Fig. 4.2).
Application of ultrasonic methods for testing of materials including polymer composites has a long-lasting tradition. In this context, ultrasound’s physical nature as a mechanical wave is used and knowledge of sound wave propagation characteristics in a tested medium allows for a theoretical analysis of a phenomenon.
The UPV tests were carried on the prismatic specimens as per the guidelines of UNE-EN 583-1/A1. Non-destructive testing, Ultrasonic examination, Part 1, General principles. AENOR, (2004), European Committee for Standardization. Test pieces with dimensions 160 X 40 X 40 mm were tested, prior to mechanical testing, perpendicularly to the 40 X 40 mm plane and the results are shown in Fig. 4.6. A comparison between mechanical and UPV test results of all soils and mixes is shown in Table 4.3 and Fig. 4.3.