Strength and microstructure properties of spent coffee grounds stabilized with rice husk ash and slag geopolymers

Suksiripattanapong, Cherdsak; Kua, Teck-Ang; Arulrajah, Arul; Maghool, Farshid; Horpibulsuk, Suksun

doi:10.1016/j.conbuildmat.2017.04.103

Cited by 91 publications

(23 citation statements)

References 51 publications

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“…There exist only a relatively small number of studies on the utilisation of RHA as a precursor for the production of AAB. RHA was blended with other precursors such as fly ash (Detphan and Chindaprasirt, 2009;Hwang and Huynh, 2015;Ziegler et al, 2016), calcined water treatment sludge (Nimwinya et al, 2016), slag and palm oil fuel ash (Karim et al, 2013), slag and fly ash (Karim et al, 2015), slag (Suksiripattanapong et al, 2017), or red mud (He et al, 2013). Research results confirmed the reactivity of RHA in an alkaline environment as a Si donor.…”

Section: Introductionmentioning

confidence: 70%

Use of Vietnamese rice husk ash for the production of sodium silicate as the activator for alkali-activated binders

Tong

Vinai

Soutsos

2018

Journal of Cleaner Production

186

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Geopolymer and Alkali-Activated Binders (AAB) has recently emerged as a new, green material with the potential to replace Portland cement in several applications. They can reduce the CO2 footprint of concrete by up to 80% and this is in addition to being more durable in certain aggressive environments. However, commercial alkaline activators contribute significantly to the cost and CO2 footprint of AAB concrete mixes. This research investigated the production of a low cost, low environmental impact sodium silicate solution (waterglass) from Rice Husk Ash (RHA) and more specifically RHA from Vietnam. A hydrothermal process for the dissolution of RHA in sodium hydroxide solution was developed. Sodium hydroxide solution concentration, process temperature and duration were studied. Optimised procedure parameters were found to be: NaOH concentration 3M, heating temperature 80 ℃ and heating duration 3h. The obtained solution was used for the production of AAB mortar made with a blend of fly ash and ground granulated blast furnace slag. Obtained compressive strength of mortar was in the range of 60 MPa at 28 days, matching the strength obtained from control samples produced with commercially available activators. Microstructural investigation (isothermal calorimetry, infrared spectroscopy, X-ray diffraction and thermogravimetric analysis) on pastes confirmed the equivalence between the solution produced with the optimised method and commercially available options. Cost analysis indicated that the proposed method could allow a reduction of almost 55% of the cost for the activation of AAB. Results from a simplified preliminary environmental analysis suggested increased sustainability of the RHA-derived solution when compared with commercially available waterglass.

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Section: Introductionmentioning

confidence: 70%

Use of Vietnamese rice husk ash for the production of sodium silicate as the activator for alkali-activated binders

Tong

Vinai

Soutsos

2018

Journal of Cleaner Production

186

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“…More recently, the use of recycled materials in civil engineering has gained attention. The optimal mix of several coffee by-products demonstrated that SCG, CS, and RH ash could be used as sustainable materials in pavement applications [120]. Later, Andreola et al experimented in clay ceramic aggregates with outstanding results, while SCG were tested as a pore-forming agent that partially replaces red clay in the material formulation before firing.…”

Section: Materials and Others Construction Materialsmentioning

confidence: 99%

Scientometric Overview of Coffee By-Products and Their Applications

et al. 2021

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As coffee consumption is on the rise, and the global coffee production creates an excess of 23 million tons of waste per year, a revolutionary transition towards a circular economy via the transformation and valorization of the main by-products from its cultivation and preparation (Coffee Husk (CH), Coffee Pulp (CP), Coffee Silverskin (CS), and Spent Coffee Grounds (SCG)) is inspiring researchers around the world. The recent growth of scholarly publications in the field and the emerging applications of coffee by-products published in these scientific papers encourages a systematic review to identify the knowledge structure, research hotspots, and to discuss the challenges and future directions. This paper displays a comprehensive scientometric analysis based on 108 articles with a high level of influence in the field of coffee by-products and their applications. According to our analysis, the research in this field shows an explosive growth since 2017, clustered in five core applications: bioactive compounds, microbial transformation, environmental applications, biofuels from thermochemical processes, and construction materials.

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“…This examination gives an understanding on the long term strength. [11] There has been interest into rectify the issue of problematic soils while they are present in a field. Application of by-product is a benefit due to firstly usage of waste and secondly gaining benefit from them rather than landfills.…”

Section: Introductionmentioning

confidence: 99%

Repeated Loading Triaxial Test on Bentonite-Slag-Tire Mixture

Chegenizadeh*,

Tay,

Nikraz

et al. 2020

IJRTE

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A road may be built on expansive soil. Therefore, it is important to know the behavior of soil in the presence of other additives such as slag and tire; which in these days research wants to use them in geotechnical and pavement projects. One of the potential way to investigate the issue is application of by-products. Among all by-product/waste, slag and tire were selected in this study. This study investigates the effect of tire and slag into the behavior of bentonite under repeated triaxial loading. For the purpose of this research, RLTT was employed. The RLTT device represents real pavement condition in laboratory scale. Three percentage of slag along with three percentage of tire were employed. The results proved that a sample with up to 15% tire behaves better against permanent deformation which the effect of slag was limited against permanent deformation.

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Strength and microstructure properties of spent coffee grounds stabilized with rice husk ash and slag geopolymers

Cited by 91 publications

References 51 publications

Use of Vietnamese rice husk ash for the production of sodium silicate as the activator for alkali-activated binders

Use of Vietnamese rice husk ash for the production of sodium silicate as the activator for alkali-activated binders

Scientometric Overview of Coffee By-Products and Their Applications

Repeated Loading Triaxial Test on Bentonite-Slag-Tire Mixture

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