Physical–mechanical properties of wood panel composites produced with Qualea sp. sawdust and recycled polypropylene

High-performance concrete has low tensile strength and brittle failure. In order to improve these properties of unreinforced concrete, the effects of adding recycled polypropylene fibers on the mechanical properties of concrete were investigated. The polypropylene fibers used were made from recycled plastic packaging for environmental reasons (long degradation time). The compressive, flexural and split tensile strengths after 1, 7, 14 and 28 days were tested. Moreover, the initial and final binding times were determined. This experimental work has included three different contents (0.5, 1.0 and 1.5 wt.% of cement) for two types of recycled polypropylene fibers. The addition of fibers improves the properties of concrete. The highest values of mechanical properties were obtained for concrete with 1.0% of polypropylene fibers for each type of fiber. The obtained effect of an increase in mechanical properties with the addition of recycled fibers compared to unreinforced concrete is unexpected and unparalleled for polypropylene fiber-reinforced concrete (69.7% and 39.4% increase in compressive strength for green polypropylene fiber (PPG) and white polypropylene fiber (PPW) respectively, 276.0% and 162.4% increase in flexural strength for PPG and PPW respectively, and 269.4% and 254.2% increase in split tensile strength for PPG and PPW respectively).

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Short-Term Mechanical Properties of Concrete Containing Recycled Polypropylene Coarse Aggregates under Ambient and Elevated Temperature

Journal of Materials in Civil Engineering ◽

10.1061/(asce)mt.1943-5533.0002046 ◽

2017 ◽

Vol 29 (10) ◽

pp. 04017191 ◽

Cited By ~ 13

Author(s):

Togay Ozbakkaloglu ◽

Lei Gu ◽

Aliakbar Gholampour

Keyword(s):

Mechanical Properties ◽

Elevated Temperature ◽

Short Term ◽

Coarse Aggregates ◽

Recycled Polypropylene

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Use of Cellulose-Containing Fillers in Composites with Polypropylene

Materials Science ◽

10.5755/j01.ms.17.2.484 ◽

1970 ◽

Vol 17 (2) ◽

pp. 150-154

Author(s):

Marianna LAKA ◽

Svetlana CHERNYAVSKAYA ◽

Galia SHULGA ◽

Viktor SHAPOVALOV ◽

Andrej VALENKOV ◽

...

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Shear Modulus ◽

Rapeseed Oil ◽

Water Retention ◽

Raw Materials ◽

Water Retention Value ◽

Water Vapour Sorption ◽

Recycled Polypropylene ◽

Sulphate Pulp

The composites, containing recycled polypropylene and fillers, obtained from different lignocellulosics by the thermocatalytic destruction method, were investigated. Birch sawdust, newsprint wastes, cotton residues and wood bleached sulphate pulp were used as raw materials for obtaining fillers. The indices of mechanical properties (tensile strength, modulus of elasticity, deformation at break, shear modulus, toughness, twisting moment) of the composites' samples were determined. It has been found that the obtained composites have relatively good mechanical properties. Better results were obtained, using fillers from sawdust and wood pulp. After treating the fillers with rapeseed oil, their water vapour sorption and water retention value (WRV) decreased. In this case, the strength of the composites was higher.http://dx.doi.org/10.5755/j01.ms.17.2.484

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Effect of Fiber Size on Mechanical and Water Absorption Properties of Recycled Polypropylene/Empty Fruit Bunches (rPP/EFB) Bio-Composites

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.842.7 ◽

2016 ◽

Vol 842 ◽

pp. 7-13 ◽

Cited By ~ 2

Author(s):

Ozi Adi Saputra ◽

Ludfiaastu Rinawati ◽

Kartika Setia Rini ◽

Dheo Adha Saputra ◽

Edi Pramono

Keyword(s):

Mechanical Properties ◽

Water Absorption ◽

Chemical Interaction ◽

Raw Materials ◽

Short Fiber ◽

Wave Number ◽

Empty Fruit Bunch ◽

Absorption Properties ◽

Recycled Polypropylene ◽

Fiber Size

The influence of fiber size on mechanical and water absorption properties of recycled Polypropylene/Palm Empty Fruit Bunch (namely, rPP/EFB) bio-composites has been conducted study. rPP/EFB bio-composite was a compounding of recycled polypropylene (rPP) and palm empty fruit bunch (EFB) with different sizes, i.e. particle size (150 mesh sieve escaped, referred as p-EFB) and short fiber (s-EFB). Manufacturing of the bio-composites was prepared by the solution method in boiling xylene via reactively process using benzoyl peroxide as an initiator. The addition of coupling agent, such as maleic anhydride grafted polypropylene (PP-g-MAH) was improve the chemical interaction between the rPP and EFB which evidenced by the shift of the wave number of raw materials on infra-red spectra of rPP/EFB bio-composite. Mechanical properties test showed that s-EFB was increase the tensile strength value up to 95% compare to rPP, higher than the p-EFB which is 56% compare to rPP. However, the elongation percentage of the bio-composites contain s-EFB was lower than the bio-composites contain p-EFB. Water absorption analysis also performed in this study to determine the biodegradability of bio-composites. In this study, fiber size gives a considerable influence on the mechanical properties of rPP/EFB bio-composites, however not significant on water absorption properties.

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Preparation and Properties of Recycled Polypropylene /Carbon Nanotube Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.279.106 ◽

2011 ◽

Vol 279 ◽

pp. 106-110 ◽

Cited By ~ 6

Author(s):

Jing Long Gao ◽

Yan Hui Liu ◽

Dong Ming Li

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Thermal Properties ◽

Carbon Nanotube ◽

Thermal Degradation ◽

Elongation At Break ◽

Recycled Polypropylene ◽

Nanotube Composites ◽

Carbon Nanotube Composites ◽

Rupture Characteristic

Recycled polypropylene (PP)/carbon nanotube (CNTs) composites with different CNTs fraction were prepared by the melting blend method. The effects of CNTs content on the thermal properties and mechanical properties were mainly investigated. The results show that the thermal degradation of the composites shifts towards higher temperatures as the concentration of CNTs is increased. With increasing CNTs content, tensile strength and elongation at break increase firstly and then decrease. When CNTs content is 3 %, tensile strength and elongation at break are 34.71 and 27.00, respectively. Moreover, a unique tensile rupture characteristic was found by SEM observations, which explained the critical broken theory of the PP/CNTs composites.

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