Strength Properties of Coffee Waste Based Geopolymers

Küçük Resim Yok

Tarih

2021

Dergi Başlığı

Dergi ISSN

Cilt Başlığı

Yayıncı

Springer Science and Business Media Deutschland GmbH

Erişim Hakkı

info:eu-repo/semantics/closedAccess

Özet

A considerable amount of coffee waste is disposed in the landfills annually. This study aims to investigate the possible use of coffee waste based geopolymers as a green construction material for landfills. Coffee is an organic and a biodegradable material. In order to use coffee waste as a construction material, the strength development of a coffee-based geopolymer was observed. Fly ash or rice husk ash were used as a precursor. These precursors were preferred because they are silica and alumina rich materials. Alkaline activator formed of sodium silicate and sodium hydroxide (Na2SiO3–NaOH) was used to trigger the geopolymerization process. Three variables were tested, the ratio of Na2SiO3–NaOH; effect of ash type, and curing time on the strength development of coffee-based geopolymers. By adding 30% of ash into coffee waste, a geopolymer was synthesized with an activator/ash ratio of 1.7 and Na2SiO3–NaOH ratio of 90–10%, which provided the highest (up to 1000 kPa) unconfined compressive strengths. This paper denotes that the coffee based-geopolymerization products will further develop the organic material into a nondegradable material, therefore suggesting geopolymers as an option to stabilize highly organic soils. © 2021, Springer Nature Switzerland AG.

Açıklama

2nd International Conference on Environmental Geotechnology,Recycled Waste Materials and Sustainable Engineering, EGRWSE 2019 -- 16 June 2019 through 20 June 2019 -- -- 248969

Anahtar Kelimeler

Coffee waste, Geopolymer, Unconfined compressive strength

Kaynak

Lecture Notes in Civil Engineering

WoS Q Değeri

Scopus Q Değeri

Q4

Cilt

90

Sayı

Künye