Physical and mechanical properties of geopolymer-crumb rubber composite

Name: Krissanapat Yomthong

Address: 333 Moo1, Thasud, Muang, Chiang Rai 57100

Organization : Mae Fah Luang University. School of Science. Materials Science

Email : ask.library@mfu.ac.th

keyword: Rubber composite

LCSH: Rubber

Classification :.LCCS: TA418.9.C6

LCSH: Polymers

LCSH: Crumb rubber

LCSH: Composite materials

Abstract: Geopolymer materials have been gained attention due to the fast development of mechanical properties. Geopolymer exhibited mechanical properties similar to Ordinary Portland Cement. However, geopolymer also exhibited brittleness properties like a ceramic material. This thesis has been done to improve the impact strength by compositing geopolymer with crumb rubber. The physical and mechanical properties including density, porosity, water absorption, microstructure, compressive strength, flexural strength, impact strength, fracture toughness were studied. This thesis was separated into 2 parts which are paste and mortar form. As the paste form, processing parameters optimization was studied including the effect of NaOH concentrations, the effect of mixings, and effect of curing regimes. In the preparation process, the ratio between alkali solution to fly ash and sodium hydroxide solution to sodium silicate solution was constant as 0.6 and 1.0. The results indicated that 6M NaOH exhibited highest compressive strength, mechanic mixing exhibited higher compressive strength than hand mixing and curing the geopolymer samples at 90°C for 24 h and further cure at room temperature was appropriate. After that, geopolymer-crumb rubber was fabricated. The suitable condition from the optimization part was selected. The crumb rubber added at 5%, 10%, 15%, and 20% using crumb rubber no. 20 and 40 mesh. The result of density was decreased with increasing crumb rubber content while porosity and water absorption approximately 32%-35% and 20% was found, respectively. The compressive and flexural strength were decreased with increasing crumb rubber content but sharply increasing impact strength and brittleness failure. The fracture toughness was improved only 5%, and 10% of crumb rubber no. 20 mesh replacement. After that, it was decreased with increasing crumb rubber content as same as crumb rubber no.40 mesh addition. As for geopolymer mortar, the optimization on river sand to fly ash ratio was studied before composited. The 7 days flexural strength of mortar wad sharply increased with increasing sand to fly ash ratio as same as density. However, porosity was in a range of 8 % accepted 20% replacement of crumb rubber no.40 mesh was 12%. The suitable sand to fly ash ratio was 1.75 because of high flexural strength with low water absorption. After compositing with crumb rubber in the percentage of 5%, 10%, 15%, and 20%, the density, flexural strength, and fracture toughness were decreased with increasing crumb rubber. The porosity was increased with increasing crumb rubber content while water absorption was around 8% accepted 20% replacement of crumb rubber no.40 mesh. As the impact strength, noted that impact strength was higher than neat geopolymer mortar at every percentage replacement. At 5% and 10% of crumb rubber no.20 mesh replacement, impact strength was sharply increased after that decreased with increasing crumb rubber content. As well as 5% of crumb rubber no.20 mesh replacement, impact strength was also sharply increased after that decreased with decreasing crumb rubber content. The highest impact strength was 20% crumb rubber no.40 mesh replacement. Finally, the potential application of geopolymer-crumb rubber composite is paving block and roof tile.

Mae Fah Luang University. Learning Resources and Educational Media Center

Address: CHIANG RAI

Email: library@mfu.ac.th

Name: Suthee Wattanasiriwech

Role: Advisor

Email : ask.library@mfu.ac.th

Name: Darunee Wattanasiriwech

Role: Co-Advisor

Email : ask.library@mfu.ac.th

Name: Pavadee Aungkavattana

Role: Co-Advisor

Email : ask.library@mfu.ac.th

Created: 2019

Issued: 2563

Modified: 2020-03-02

Issued: 2020-03-02

วิทยานิพนธ์/Thesis

application/pdf

CallNumber: Thesis TA418.9.C6 K928p 2019

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Materials Science

Grantor: Mae Fah Luang University

©copyrights Mae Fah Luang University

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