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58 JOURNAL OF MATERIALS AND ENGINEERING STRUCTURES 7 (2020) 57–72 mechanical recycling, chemical recycling or the combination of the two methods usually are followed. One type of plastics is Polyethylene (PE); the polyethylene divided into two main kinds, the high density polyethylene (HDPE) and low-density polyethylene (LDPE). HDPE is stiffer and tougher than LDPE, and is every time white milky color, even when very thin. It is utilized for manufactures sheath and bags, detergents, fine drinks glasses, toys, cosmetic containers, jerry cans, crate, garbage and other domestic materials [1]. LDPE is smooth, flexible and cutting easy, with the candle wax feeling. When it is very thin, it is clear; when thick, it is white milky, except if added pigment. Used of LDPE in the film bags manufacture, sheeting and sacks, food boxes, bang-mildew glasses, hosepipes and pliable piping, domestic materials such as bowls and buckets, sheaths of telephone cable and toys etc.. Nowadays, there is a large amount of LDPE wastes in Iraq as a result of industrializes actions and it requires to removal this waste. There is a chance to use another method of recycling via shredding different concrete properties with a normal aggregate partly plastic aggregate altered came from different plastic wastes. Ismail and AL-Hashmi [4] applied waste plastic utilized as a smooth aggregate partial altered by 0%, 10%, 15%, and 20% by weight and the mixtures of concrete was evaluated at period 3, 7, 14, to 28 days. These parameters include solidity index, compressive strength, fresh density, slump, dry density and flexural strength. The mixtures of waste plastic concrete slump results manifested a trend to reduce lower the plunge of the reference mix of concrete. Also, the dry and fresh density and flexural strengths and compressive have a trend to reduce with rising the ratio of waste plastic on whole treated ages. Choi et al. [5] explained in their research the mortar characteristics and concrete including fine aggregate made from waste reprocess polyethylene terephthalate (PET) glasses as waste plastic lightweight aggregate (WPLA). The mixtures of concrete were utilized with water to cement ratio (w/c) of 0.45, 0.49 and 0.53. For each round of concrete, the alteration of WPLA by ball of fine aggregate was 0%, 25%, 50% and 75%, respectively. They reported that for WPLA 25%, 50% and 75% concrete mixtures, decreased of the compressive strength, 6%, 16% and 30% respectively, when average contrasted to the stander concrete. Akcaozoglu et al. [6] achieved investigation on two mortar sample groups; one just synthetic with PET aggregates and the other was synthetic both sand aggregates and PET. Furthermore, 50% of cement on mass basis was replaced with blast furnace slag. The authors found that the compressive, weight of unit, the flexural and values tensile strength, sand aggregates and carbonation deepness of the mortars including PET together to be high-rise than the only PET aggregates mortars including. Hannawi et al. [7] utilized (PET) waste and polycarbonate (PC) as partially alters of the sand in mortar. Different volume portions of sand, 3%, 10%, 20% and 50% were altered by the same used plastic volume. The results showed that the waste plastic mixtures dry density values tendency to reduce by 19% and 24%, respectively; for 50% PET and PC plastic aggregates; increasing PET and PC aggregate content lead to decreased flexibility modulus and the strength compress in the mixtures. The authors did not observe important variations in the mortar specimens up to 20 % PC-aggregates and flexural strength up to 10 % PET-aggregates with the same texture. Moreover, reduce of 9.5 and 17.9 % for mixtures with 20 and 50 % PET- aggregates, respectively, were noticed. For add with 50 % PC aggregates, a reduction of 32.8 % was calculated. Rai et al. [8] utilized waste plastic plates as a partial sand replacement in different ratios (0%, 5%, 10%, and 15%) by volume with and without superplasticizer. The authors stated that there is a sharply declining in slump results with increase the ratio of waste plastic; fresh and dry density during all treated age tend to drop with raising ratio of waste plastic for every concrete mix. Also, they found, at every curing age, flexural strength and the compressive estimations of plastic waste concrete blends reduce by raising the ratio of waste plastic. Rahman et al. [9] studied the possible by using waste polymeric materials recycled alteration for concrete aggregates. The waste polymer divided into three kind, namely high density polyethylene (HDPE), tire of cars and widened polystyrene (EPS), were used in this study. The results indicated that addition of waste polymer lowering absorption of water and concrete porosity. It also lowered the compressive strength with increase the waste polymer content for the concrete. Safi [10] explained using of the plastic waste impact such as a fine aggregate on self-compress mortar action. The sand was replaced with the plastic waste at ratios (0%, 10%, 20%, 30% and 50% by weight of the sand). According to results obtained, the bulk density, the porosity, the compressive and flexural strengths of self-condense mortars reduced with increasing content of plastic waste at all curing ages. The results showed a little lower o sound velocity of self-condense mortar for any sand replacement by plastic waste, contrasted to the reference mortar at all treated age. Rahmani et al. [11] discussed the concrete mechanical characteristics that contain waste PET particles at proportions (5%, 10% and 15%) as a partial altered of sand with two w/c ratios (0.42, 0.54). The results explained that the workability ofPDF Image | Properties of Concrete and Mortar with LDPE Aggregate
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