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Experimental Study on Cementless PET Mortar with Marble Powder and Iron Slag as an Aggregate
Shahid Ullah Khan1, Abdur Rahim1, Nur Izzi Md Yusoff2
1Department of Transportation and Management, University of Engineering and Technology, Lahore 54890, Pakistan.
Materials (Basel, Switzerland)
|August 12, 2023
Summary
This study explores using waste polyethylene terephthalate (PET) plastic as a binder in mortar, finding that mixes with marble and iron slag significantly enhance strength and durability. PET mortar without cement shows promise for construction applications.
Area of Science:
- Materials Science
- Civil Engineering
- Environmental Science
Background:
- Global plastic production is rising, with low recycling rates contributing to environmental pollution.
- Incorporating waste plastic into construction materials offers a potential solution to plastic waste.
- Previous attempts using waste polyethylene terephthalate (PET) as concrete aggregate weakened its properties.
Purpose of the Study:
- To investigate the mechanical and durability properties of mortar utilizing waste PET bottles as a binder.
- To evaluate the effectiveness of marble and iron slag as additives in PET-based mortar.
- To compare the performance of novel PET mortar formulations against ordinary Portland cement (OPC) mortar.
Main Methods:
- Preparation of various PET mortar mixes: plastic and marble (PM), plastic and iron slag (PI), plastic, sand, and marble (PSM), plastic, iron slag, and marble (PIM), and plastic, sand, and iron slag (PSI).
- Testing of mechanical properties, including compressive and flexural strength, for different plastic content percentages.
- Assessment of durability through mass loss measurements in chemical solutions (5% HCl, 20% NaOH, NaCl) over 3, 7, and 28 days.
Main Results:
- PM mixes with 30-45% plastic showed increased compressive and flexural strength by up to 35.73% and 20.21%.
- PI mixes (30-35% plastic) improved strength, but higher plastic content (45%) led to decreased strength.
- PSM, PIM, and PSI specimens demonstrated nearly double the strength of OPC mortar.
- PET mortar exhibited good resistance to HCl and NaCl but lower resistance to NaOH compared to OPC mortar.
Conclusions:
- PET mortar incorporating marble and iron slag exhibits superior mechanical properties and durability compared to conventional cement mortar.
- PET mortar without cement shows enhanced strength and durability, making it a viable sustainable material for applications like paver tiles, drainage systems, and roads.
- Further research into optimizing PET mortar formulations can lead to significant environmental benefits and innovative construction materials.
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