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66 JOURNAL OF MATERIALS AND ENGINEERING STRUCTURES 7 (2020) 57–72 3 Results and Discussion 3.1 Density of concrete and mortar Results of dry densities of LDPE granule concrete and mortar mixes are seen in Fig. 8. This data show the dry density of concrete tends to reduce by the same manner reaching upper decreasing 8.6% for CP30 as given in Table 6. Whilst dry density of mortar is decreased by slightly higher difference contrasted to density of concrete and upper reduction reached 12% for MP25 and lowest density as presented in Table 6. This decreasing may be attributed to density of LDPE particles which are less than the sand and leads to dry density reduction. However, the lowest dry density is 2240 kg/m3 for CP30. From obtained data, the Mathematical model for prediction of density (kg/m3) of concrete and mortar is as follows: γcdP/ γcd = 0.9897- 0.0051(VLDPE)+ 9*10-5 (VLDPE) 2 (1) γmdP/ γmd = 0.9858 - 0.0114 (VLDPE)+ 0.0003 (VLDPE) 2 (2) In which γcd, γmd are dry density of concrete and mortar without LDPE, γcdP, γmdP are dry density of concrete and mortar with LDPE and VLDPE is the LDPE volume. For the relationship one R2 is equal to 0.90 and R2 is 0.88 for relationship two. 1.02 1 0.98 0.96 0.94 0.92 0.9 0.88 0.86 Experimental data of concrete Experimental data of mortar Poly. (Experimental data of concrete) Poly. (Experimental data of mortar) 0 5 10 15 20 25 30 35 LDPE[%] Fig. 8- Relative dry density and LDPE volume for concrete and mortar 3.2 Concrete compressive strength The Fig. 9 showed the results of compressive strength. One can find that there is decreasing of the strength of mortar and concrete when different volume of LDPE particles is added, as given in Table 6. This decreasing can be attributed to the decrease LDPE aggregate elastic modulus contrasted to ordinary fine aggregate, huge volume of molecules of LDPE aggregates than ordinary fine aggregate, and weak of bonding between cement paste and LDPE aggregate because of water internal bleeds from the lightweight aggregates wholly saturated that surrounded and amassed the granules of waste LDPE. Also, the concrete compressive strength is decreased when LDPE granules are added, reaching less decrease 76 % for CP30 compared to plain concrete (control mix). Additional reasons behind this strength lessening are approximately identical size of PE particles which led to increase pores size in the concrete internal structure and caused a strength reduction, and plastic is a hydrophobic material that may be restricted the water essential for hydration of cement from step inside a concrete specimens structure during a remediation period. Moreover, every compressive strength value is greater than the lower compressive strength requisite for structural of concrete to be 17.24 MPa. The failure samples of the concrete that consist of LDPE aggregates under effect of pressure not revealed the usual brittle kind of failure generally good for ordinary concrete. The experimental failure was further step by step failure, based on PE aggregates content. While LDPE aggregates content was raised, the failure type turned into more flexible. At end of the test, these samples including LDPE aggregates were able of carrying the compress for a little minutes with no full crush (see figure 10). Mathematical models using Excel programmed are getting to explain the relation between compressive strength (MPa) and PE aggregate content for concrete and mortar, which are as follows: Relative dry densityPDF Image | Properties of Concrete and Mortar with LDPE Aggregate
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