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JOURNAL OF MATERIALS AND ENGINEERING STRUCTURES 7 (2020) 57–72 69 as the increases of the compressive strength and the tensile strength, also raise, but at a lessen rate [28]. From Fig. 13, it is apparent that splitting tensile strength is a compressive strength, function and the graph indicate that raising compressive strength will lead to raise in splitting tensile strength. It found an empirical formula to express relation between split tensile strength and compressive strength, which is as following: fsp = - 2.6341+ 0.3679fc-0.0072 fc2 (6) For this earlier formula R2 is equal to 0.96. 2.5 2 1.5 1 0.5 0 Experimental data Poly. (Experimental data) 15 16 17 18 19 20 21 22 23 24 25 Compressive strength [MPa] Fig. 13- Splitting tensile and compressive strengths relationship for concrete 3.5 Ultrasonic pulse velocity (UPV) Figure 14 presents the effect of LDPE aggregate on UPV for cubical and cylindrical specimens. It can be showed a slight decrease in UPV with increase PE aggregate content in the mixture. This is due to the fact that when an occurrence, wave goes through various elements (concrete, LDPE, holes), it be inverted and transferred partly, so, decreases its speed. As the UPV is a properties of the flexibility and volumetric components function concentrations, so replacement fine aggregate by LDPE granules will decrease UPV. 5 4.9 4.8 4.7 4.6 4.5 4.4 4.3 4.2 4.1 4 cubical specimen cylindrical specimen Linear (cubical specimen ) Linear (cylindrical specimen) 0 5 10 15 20 25 30 35 PVC volume [%] Fig. 14- Ultrasonic pulse velocity and PE volume relationship of cubical and cylindrical concrete specimens Ultrasonic Pulse Velocity [km/s] Splitting tensile strength [MPa]PDF Image | Properties of Concrete and Mortar with LDPE Aggregate
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