Evaluation of Rice Straw Ash as a Pozzolanic Addition in Cementitious Mixtures

Rice husk ash is one of the most widely studied biomass ashes used in pozzolanic addition. Given its lower silica content, rice straw ash (RSA) has been explored less often, despite the fact that, according to the United Nations Food and Agriculture Organization (FAO), rice straw (RS) production is estimated at 600 million tons/year. In this work, RSA was physically and chemically characterized, and its pozzolanic properties were assessed. A controlled conditioning, burning, homogenization and grinding procedure was carried out to obtain RSA from RS. Chemical composition, insoluble residue, reactive silica, chloride content and particle size distribution were assessed for ash characterization. To determine RSA pozzolanicity, Frattini, electrical conductivity and pH measurements in an aqueous suspension of hydrated CH/RSA mixtures were obtained. Portland cement (PC) mortars with 15% and 30% RSA substitutions evaluated. The mechanical tests showed specimens with a strength activity index up to 90% and 80% with 15% and 30% RSA, respectively, after 3 days, and these values grew to 107–109% after 90 curing days.

Download Full-text

Co-Incineration of Rice Straw-Wood Pellets: A Sustainable Strategy for the Valorisation of Rice Waste

Energies ◽

10.3390/en13215750 ◽

2020 ◽

Vol 13 (21) ◽

pp. 5750

Author(s):

Cristina Moliner ◽

Dario Bove ◽

Elisabetta Arato

Keyword(s):

Rice Straw ◽

Experimental Tests ◽

Silica Content ◽

Added Value ◽

Special Focus ◽

Experimental Plant ◽

Wood Pellets ◽

Operational Conditions ◽

Food And Agriculture ◽

Food And Agriculture Organization

Agricultural activities produce an estimated amount of 32.7 MToe/year of residues in EU countries. They are mostly disposed in landfills, incinerated without any control, or abandoned in fields, causing severe impacts on human health and environment. Rice is one of the most consumed crops worldwide with an annual production of 782 million tons according to the Food and Agriculture Organization of the United Nations database. In this context, the EU-funded project LIFE LIBERNITRATE promotes the use of renewable residual sources (i.e., rice straw) to obtain new materials with an added value. The methodology is based on the incineration of rice straw in an own-designed and constructed valorization system. Rice straw/wood pellets are burned in optimized conditions to produce a maximized quantity of ashes with high silica content. These materials will be then used to treat water polluted with nitrates, representing an optimal example of circular economy strategy. In this work, the own-designed valorization unit is described, with special focus on its main constituting elements. The theoretical study of the co-incineration of rice straw and wood pellets identified the optimised combustion conditions. Experimental tests using the theoretical inputs confirmed the most adequate operational conditions (10 g rice straw pellets/min + 10 g wood pellets/min, 6–7 Nm3/h of air, T = 500 °C) and helped in the definition of improvements on the experimental plant.

Download Full-text

An Approach to a New Supplementary Cementing Material: Arundo donax Straw Ash

Sustainability ◽

10.3390/su10114273 ◽

2018 ◽

Vol 10 (11) ◽

pp. 4273 ◽

Cited By ~ 2

Author(s):

Jordi Payá ◽

Josefa Roselló ◽

José Monzó ◽

Alejandro Escalera ◽

María Santamarina ◽

...

Keyword(s):

Chloride Content ◽

Silica Content ◽

Arundo Donax ◽

Main Element ◽

Strength Development ◽

Steel Reinforced Concrete ◽

Plant Parts ◽

Compressive Strength Development ◽

Cementing Material ◽

Straw Ash

Arundo donax is a plant native to Asia and is considered an invader species in the Mediterranean region and many tropical zones in the world. These invader plants can be collected to produce a biomass, which can be converted to ash by combustion. The scope of the study is to assess the use of these ashes (Arundo donax straw ash [ADSA]) as supplementary cementing material due to their relatively high silica content. Electron microscopy studies on dried and calcined samples of different plant parts (cane, sheath leaf and leaf) were carried out. Some different cellular structures were identified in the spodogram (remaining skeleton after calcination). Major silica content was found in leaves and sheath leaves. The main element in all the ashes studied, together with oxygen, was potassium (22 to 46% depending on the part of the plant). Chloride content was also high (5–13%), which limits their use to non-steel reinforced concrete. The pozzolanic reactivity of ADSA was assessed in pastes by thermogravimetric analysis and in mortars with ordinary Portland cement based on compressive strength development. Excellent results were found in terms of reactivity.

Download Full-text

Water Extract of Rice Straw Ash: Experimental Design and Evaluation of Their Activity in the Hydrothiolation Reaction

Waste and Biomass Valorization ◽

10.1007/s12649-021-01370-9 ◽

2021 ◽

Author(s):

Marcia Victória Silveira ◽

Giovani Zandoná ◽

Andrielli Leitemberger ◽

Lucas M. C. Böhs ◽

Toni J. Lopes ◽

...

Keyword(s):

Experimental Design ◽

Rice Straw ◽

Water Extract ◽

Straw Ash

Download Full-text

Characterization and Evaluation of Thermodynamic Parameters for Egyptian Heap Fired Rice Straw Ash (RSA)

International Journal of Chemistry ◽

10.5539/ijc.v2n1p81 ◽

2010 ◽

Vol 2 (1) ◽

Cited By ~ 11

Author(s):

Morsi M. Abou-Sekkina ◽

Raafat M. Issa ◽

Alam El-Deen M. Bastawisy ◽

Wael A. El-Helece

Keyword(s):

Thermodynamic Parameters ◽

Rice Straw ◽

Straw Ash

Download Full-text

Sustainable and Environmentally Friendly Essential Oils Extracted from Pineapple Waste

Biointerface Research in Applied Chemistry ◽

10.33263/briac125.68336844 ◽

2021 ◽

Vol 12 (5) ◽

pp. 6833-6844

Keyword(s):

Essential Oil ◽

Essential Oils ◽

Bioactive Compounds ◽

Raw Material ◽

Ananas Comosus ◽

Pineapple Waste ◽

Food And Agriculture ◽

Food And Agriculture Organization ◽

Aldehydes And Ketones ◽

United Nations Food

Pineapple (Ananas comosus (L.) Merril), one of the major fruit crops, is mainly used for raw consumption and for industrial juice production, which creates large amounts of residues. The United Nations Food and Agriculture Organization (FAO) has estimated that pineapple waste accounts for between 50 to 65 % of the total weight of the fruit. Industrial pineapple waste is a major source of pollution as important quantities of primary residues are not further processed. Pineapple waste contains bioactive compounds such as carotenoids, polyphenols, fibers, vitamins, enzymes, and essential oils. These phytochemicals can be used in the food industry, medicine and pharmacy, textile, and others. This review highlights essential oil and other bioactive compounds extracted from pineapple waste and the composition of pineapple essential oil. Pineapple peels are the potential raw material for essential oil extraction through various methods. Modern spectrometric methods have shown that essential oil extracted from pineapple waste comprises esters, alcohols, aldehydes, and ketones. From this overview, it can be concluded that there is an important need for further research into pineapple waste as a potential source of valuable byproducts, as well as new techniques to studying industrial organic residuals to achieve higher recovery rates of valuable bioactive compounds used in pharmaceuticals, cosmetic and chemical industries as well as for developing new functional foods.

Download Full-text

Karakterisasi Bionanofiller Dari Limbah Padi Sebagai Alternatif Penguatan Pada Polimer Komposit

Jurnal Serambi Engineering ◽

10.32672/jse.v3i2.717 ◽

2018 ◽

Vol 3 (2) ◽

Author(s):

Eryani . ◽

Sri Aprilia ◽

Farid Mulana

Keyword(s):

Rice Straw ◽

Rice Husk ◽

Rice Husk Ash ◽

Particle Density ◽

Agricultural Waste ◽

Xrd Analysis ◽

Silica Content ◽

Sem Analysis ◽

Agricultural Produce ◽

Mechanical Properties Characterization

<p>Agricultural waste such as rice straw, rice husk and rice husk ash have not been utilized properly. This waste of agricultural produce can actually be used as an alternative to bionanofiller because it contains an excellent source of silica. The silica content contained in the rice waste when combined with the polymer matrix can produce composites having high thermal and mechanical properties. Characterization of bionanofiller from this rice waste is done by SEM, XRF, FTIR, XRD and particle density. The result of SEM analysis from this rice waste is feasible to be used as filler because it has size 1 μm. Likewise with the results of XRF analysis that rice waste contains a high enough silica component that is 80.6255% - 89.83%. FTIR test results also show that bionanoparticles from rice waste have the same content of silica. In the XRD analysis the best selective gain of rice waste is found in rice husk ash which is characteristic of amorp silica at a range of 2ϴ = 22<br />. The largest density analysis of paddy waste was found in rice husk 0.0419 gr / cm , followed by rice straw by of 0.0417 gr / cm 3 and rice hulk ash 0.0407 g / cm 3</p>

Download Full-text

PENGARUH PENAMBAHAN ABU CANGKANG BEKICOT PADA SEMEN RAMAH LINGKUNGAN TERHADAP KUAT TEKAN MORTAR

JURNAL QUA TEKNIKA ◽

10.30957/quateknika.v8i2.502 ◽

2018 ◽

Vol 8 (2) ◽

pp. 63-69

Author(s):

Achendri M. Kurniawan ◽

Devita Sulistiana

Keyword(s):

Compressive Strength ◽

Experimental Method ◽

Rice Straw ◽

Research Method ◽

Environmental Damage ◽

Fine Aggregate ◽

Compressive Test ◽

Snail Shell ◽

Substitute Material ◽

Straw Ash

Blitar Regency is one of the strange culinary centers, among which are processed various foods from snail base ingredients, ranging from kripik, sate oseng-oseng and so on as well as the existence of Blitar district is one of the rice barns in East Java. With the existence of Blitar district as a snail-based culinary producer and one of the rice barns in East Java, this is not spared from several problems, such as the disposal of snail shells in the river and burning of rice straw in rice fields which both will cause environmental damage. This study aims to examine the use of snail shell ash and rice straw ash as a substitute material for cement in mortar mixtures against mortar compressive strength. The research method used was the experimental method by mixing fine aggregate main ingredients with snail shell ash and rice straw ash then testing the compressive strength. The results of the compressive test with the addition of the percentage of snail shell shell turned out to increase by 54.78%.

Download Full-text