Durability and hardened characteristics of cement mortar incorporating waste plastic and Polypropylene exposed to MgSO4 attack
Osamah Mohammed Ghazi Al-Kerttani, Nahla Hilal, Sheelan Mahmoud Hama, Nadhim Hamah Sor, Qais Sahib Banyhussan, Taher A. Tawfik
Abstract
• Analysis of the impact of recycled waste plastic on the durability, and mechanical aspects of cement mortar. • Comprehensive assessment of recycled two types of waste plastic as sand influence on cement mortar durability, and strength properties. • Use of waste materials will reduce environmental menace. • Investigated the effects of magnesium sulfate on the performance of cement mortar specimens. • A model using ANOVA was proposed to predict the compressive strength of recycled waste plastic sand contents in concrete. Annual waste plastic disposal has grown, harming nature. Utilising this waste in concrete production may help preserve building resources. This study tested cement mortar with polyvinyl chloride (PVC) and polypropylene (PP) substituted for sand aggregate at 0, 5, 10, 15, and 20%. The samples were nevertheless exposed to a 10% and 20% MgSO 4 solution for a month. The properties of both fresh and hardened materials under these circumstances have been evaluated and contrasted with those evaluated under typical circumstances. For mixes including PP and PVC, the flow diameter increased. The rounded plastic particles provided fewer contact surfaces and less friction among mixtures, which reduced water consumption and improved workability, leading to an increase in slump flow. As the amount of plastic aggregate increases, the compressive strength decreased. Moreover, this pattern might be explained by the weakening of the bond between the surfaces of the plastic aggregate and cement paste. The hydration of cement may also be hampered by the hydrophobic properties of plastic aggregate. Like compressive strength, the splitting tensile strength decreased as the replacement level of plastic ratio increased regardless of its type under all conditions (normal and exposing to MgSO 4 ). PP and PVC fine aggregate in mortar increases sorptivity under all situations. Following screening, those circumstances and PVC have the most impact on compressive strength. increasing PVC and PP at 10% for each of them leads to lower values of compressive and tensile strength. An optimization process was implemented to determine the optimum value of PVC, PP, and MgSO 4 . It shows that using PVC of 3.9%, PP of 10.1%, and MgSO 4 of 19.59% leads to maximum compressive and tensile strength with the minimum cost and CO 2 emissions.