Effectiveness of waste rubber tire with high-density polyethylene binder as a biaxial geogrid reinforcement material for subgrade soil based on its California bearing ratio/ Eric Estrada, Angelica Marie Alyssa C. Oribiana, Frances Mae S. Loreto, John David D. Ting, and Dariella Z. Villahermosa .--

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Estrada, Eric [author ]

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TextPublication details: Manila: Technological University of the Philippines, 2023.Description: xvii, 161pages: 29cm. +1 CD-ROM (4 3/4in.)Content type:

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BTH TA 145 E88 2023

Dissertation note: College of Engineering .-- Bachelor of Science in Civil Engineering: Technological University of the Philippines, 2023. Summary: This study aimed to determine the effectiveness of utilizing waste rubber tires with high-density polyethylene binder as a biaxial geogrid reinforcement material for subgrade soil based on its California-Bearing ratio. Powdered waste rubber tires were mixed with a binding material, shredded High-Density Polyethylene (HDPE), using a ratio of 65% rubber to 35% HDPE, 60% rubber to 40% HDPE, and 55% rubber to 45% HDPE. The mixture was processed under a roll mill machine and pressed in a compression molder to produce 8 inches by 8 inches sheet with 2mm thickness. An equally spaced 33-mm by 33- mm aperture was extruded from the sheet to form a grid. It was then tested for physical properties to determine rib thickness and aperture. Moreover, mechanical tests including tensile strength tested using a Multi-rib Tensile Method (ASTM 6637) and the California Bearing Ratio Test (ASTM D1883) performed on both commercially available geogrids and the waste rubber geogrid. Test specimens include unreinforced subgrade soil, a subgrade soil reinforced with commercially available geogrid, and a subgrade soil reinforced with the rubber geogrid. The results showed that among the variants of waste rubber tire geogrid that was made, the ratio of 65% rubber to 35% HDPE was the most viable mixture due to having the closest CBR value when compared to the commercially available geogrid. The researchers also concluded that the other mixtures of WRT geogrid were still competent enough due to having positive change/improvements. Therefore, it concludes that all design mix ratios have an effect in increasing the CBR value of unreinforced soil but only design mix ratio 60:40, 65:35, and commercially available geogrid shows a notable effect as supported by their strong significant difference.

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Item type	Current library	Shelving location	Call number	Copy number	Status	Date due	Barcode
Bachelor's Thesis COE	TUP Manila Library	Thesis Section-2nd floor	BTH TA 145 E88 2023 (Browse shelf(Opens below))	c.1.	Not for loan		BTH0003932

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Thesis (undergraduate)

College of Engineering .-- Bachelor of Science in Civil Engineering: Technological University of the Philippines, 2023.

Includes bibliography:

This study aimed to determine the effectiveness of utilizing waste rubber tires with
high-density polyethylene binder as a biaxial geogrid reinforcement material for subgrade
soil based on its California-Bearing ratio. Powdered waste rubber tires were mixed with a
binding material, shredded High-Density Polyethylene (HDPE), using a ratio of 65%
rubber to 35% HDPE, 60% rubber to 40% HDPE, and 55% rubber to 45% HDPE. The
mixture was processed under a roll mill machine and pressed in a compression molder to
produce 8 inches by 8 inches sheet with 2mm thickness. An equally spaced 33-mm by 33-
mm aperture was extruded from the sheet to form a grid. It was then tested for physical
properties to determine rib thickness and aperture. Moreover, mechanical tests including
tensile strength tested using a Multi-rib Tensile Method (ASTM 6637) and the California
Bearing Ratio Test (ASTM D1883) performed on both commercially available geogrids
and the waste rubber geogrid. Test specimens include unreinforced subgrade soil, a
subgrade soil reinforced with commercially available geogrid, and a subgrade soil
reinforced with the rubber geogrid. The results showed that among the variants of waste
rubber tire geogrid that was made, the ratio of 65% rubber to 35% HDPE was the most
viable mixture due to having the closest CBR value when compared to the commercially
available geogrid. The researchers also concluded that the other mixtures of WRT geogrid
were still competent enough due to having positive change/improvements. Therefore, it
concludes that all design mix ratios have an effect in increasing the CBR value of
unreinforced soil but only design mix ratio 60:40, 65:35, and commercially available
geogrid shows a notable effect as supported by their strong significant difference.

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