Properties of Cement Mortar Consisting Raw Rice Husk

Ahmad, Muhammad Munsif; Ahmad, Fauziah; Azmi, Mastura; Zahid, Mohd Zulham Affandi Mohd

doi:10.4028/www.scientific.net/amm.802.267

Cited by 12 publications

(4 citation statements)

References 10 publications

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“…Hence filling up of pores, in forming the dense slurry coating may have been less consistent with RHA. The lower density of RHA compared to other particles can be another cause for the lower densities in type 2 treated aggregates [66,67]. Also, slightly higher water absorbing nature of RHA [67] might have caused the diminutive increment in water absorption compared to type 1.…”

Section: Particle Density and Water Absorption Of Aggregatesmentioning

confidence: 99%

“…It can be said that effects from the two types of slurries are similar, since resulting aggregate properties obtained, are very much alike for type 1 and type 2. The only slight difference is that inclusion of RHA in the concrete mix has resulted in lowering the hardened density owing to the slight porosity induced by RHA in the concrete mix [39,66].…”

Section: Compressive Strength and Density Of Hardened Concretementioning

confidence: 99%

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Development of high strength recycled aggregate concrete-composite effects of fly ash, silica fume and rice husk ash as pozzolans

et al. 2022

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The world today has started facing bigger problems related to the concrete industry, especially with concrete becoming the most extensively used construction material in the world. At a time like this, where more eco-friendly substitutions are stringent, it calls for a more comprehensive approach in producing recycled concrete from recycled concrete aggregates (RCA). This study is an extension to previous studies involving composite utilization of pozzolans in treating RCA. It investigates on the possibility of using rice husk ash (RHA) along with other pozzolans as a cement replacement, in both stages of aggregate treatment and concrete production. It was observed that through this treatment, aggregate specific gravity was increased to a value of 2.37 which was earlier 2.18 for untreated RCA, 26% and 59% reductions were obtained for water absorption and porosity of aggregates, respectively. Further the concrete which contained RHA in both stages, attained a high strength of 55.4 MPa, even surpassing the control mix containing natural aggregates. The same mix resulted a 12% increase in its surface resistivity. Rapid Chloride Permeability Test (RCPT) and water permeability results also showed substantial improvements when compared to the reference RCA mix. Similar to previous studies involving composite use of pozzolans, improvements in the microstructure of both the aggregates and concrete through the use of RHA resulted in the amelioration of both mechanical and durability properties of concrete. This evidently indicates the possibility of achieving high strengths, even with the use of RCA derived from parent concretes of lower grades.

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Section: Particle Density and Water Absorption Of Aggregatesmentioning

confidence: 99%

Section: Compressive Strength and Density Of Hardened Concretementioning

confidence: 99%

Development of high strength recycled aggregate concrete-composite effects of fly ash, silica fume and rice husk ash as pozzolans

et al. 2022

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“…Nesses estudos, o volume de fibra adicionada foi o fator principal para a redução da condutividade térmica, apontando uma relação inversamente proporcional. Nessa perspectiva [34,35] estudaram os efeitos da adição de casca de arroz em materiais cimentícios e relataram o aumento da porosidade, o que a princípio deveria reduzir a condutividade térmica, e contraria os resultados encontrados.…”

Section: Condutividade Térmicaunclassified

Desempenho térmico-acústico-mecânico de um compósito de matriz cimentícia leve reforçado com casca de arroz

et al. 2019

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RESUMOVisando desenvolver um novo produto com bom desempenho térmico-acústico-mecânico para servir como alternativa aos materiais comumente utilizados para vedação, foi produzido um compósito a partir de uma matriz cimentícia leve e casca de arroz. A matriz cimentícia consistindo em uma pasta de cimento com ar incorporado, que é intitulada por vários pesquisadores como concreto celular, tem como características principais sua reduzida massa específica e o grande número de pequenos poros não interligados. Por sua vez, a casca de arroz é uma fibra vegetal oriunda da benfeitoria do arroz abundante no estado do Rio Grande do Sul, que é o maior produtor nacional do grão, e que não possui atualmente uma destinação adequada. O concreto celular e o compósito (concreto celular mais casca de arroz) foram testados quanto à resistência mecânica à compressão axial simples e quanto aos desempenhos acústico e térmico. Em relação à resistência à compressão, apesar de constatar-se que a casca de arroz influenciou negativamente no produto, ambos os materiais atingiram respectivamente as resistências mínimas de 1,20 MPa e 1,50 MPa estipuladas pelas NBR 13.438 e NBR 15.270, entretanto, somente a matriz atendeu aos 3,00 MPa exigidos pela NBR 6136. Na análise acústica, o compósito obteve um melhor desempenho quanto a absorção acústica, por outro lado, quanto ao isolamento acústico os materiais não apresentaram valores estatisticamente diferentes, impossibilitando afirmar qual produto é superior. No que concerne a condutividade térmica, o compósito com casca de arroz apresentou desempenho inferior à matriz, fato atribuído à elevada quantidade de matéria orgânica presente nas fibras. Palavras-chave: concreto celular, casca de arroz, desempenho acústico, condutividade térmica, resistência mecânica. ABSTRACTAiming to develop a new product with good thermal-acoustic-mechanical performance to serve as an alternative to the materials commonly used for sealing, a composite was fabricated from a light cementitious matrix and rice husk. The cement matrix consisting in a cement paste with incorporated air, titled by several researchers as cellular concrete, presents main characteristics such as low specific mass and the large number of non-interconnected small pores. In turn, the rice husk is a vegetal fiber derived from the residue of rice production abundant in the Rio Grande do Sul state, the largest national producer of the grain. The cellular concrete and the composite (cellular concrete plus rice husk) were tested for mechanical resistance by single axial compression and by acoustic and thermal performance. Regarding the compressive strength, although the rice husk had a negative influence on the product, the both materials reached respectively the minimum strengths of 1.20 MPa and 1.50 MPa stipulated by NBR 13.438 and NBR 15.270, however, only the matrix (cellular concrete) hit the 3.00 MPa required by the NBR 6136. For the acoustic test, the composite obtained a better performance in acoustic absorption; on the other hand, concerned with...

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“…Rice husks are used as fillers in polymeric materials and are one of the agricultural residues used to manufacture wood replacement materials [23]. Many researchers have used rice husk ash to obtain nano-silica for composite materials, cement, and concrete [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Geopolymeric Composite Materials Made of Sol-Gel Silica and Agroindustrial Wastes of Rice, Barley, and Coffee Husks with Wood-Like Finishing

et al. 2022

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Geopolymers have been mainly utilized as structural materials; their chemical structure and morphologies have been explored for their potential as a high-performance material in emerging applications. Geopolymer composites reinforced with materials based on agro-waste are attracting interest in engineering applications due to their easy processing, low cost, low density, and high strength-to-weight ratio. This investigation pursues an experimental methodology that consists of a scheme to make composites with a geopolymer matrix and agro-waste (rice husk, barley, and coffee) as aggregate material, that can be applied in various fields of construction. The study was intended to determine the influence of adding various agro-wastes on the mechanical properties of the geopolymer. According to the respective ASTM standards, the materials obtained were prepared and analyzed to determine their compressive strength, flexural strength, hardness and scanning electron microscopy (SEM)-determined characteristics. The results revealed that, for the compression tests, the composites formed by a sol-gel matrix and barley husk showed a better yield, obtaining the highest value of 3.5 N/mm2. Concerning hardness testing, the composites with a geopolymer matrix and coffee husks obtained higher values compared to the other composites. For the flexural tests, the compounds with the sol-gel/fly ash matrix obtained the highest yield stress value, which was 5.25 MPa with an elastic modulus of 7.59 GPa. The results of the microstructural analysis showed good husk-matrix interaction, together with failure mechanisms. The conformation of such waste-based compounds may enable them to replace natural wood in some applications, such as in the finishing of interiors of homes, during the final stages in the construction of buildings, or in the decoration of inhabited houses, as well as in finishing in the manufacture of furniture.

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Properties of Cement Mortar Consisting Raw Rice Husk

Cited by 12 publications

References 10 publications

Development of high strength recycled aggregate concrete-composite effects of fly ash, silica fume and rice husk ash as pozzolans

Development of high strength recycled aggregate concrete-composite effects of fly ash, silica fume and rice husk ash as pozzolans

Desempenho térmico-acústico-mecânico de um compósito de matriz cimentícia leve reforçado com casca de arroz

Geopolymeric Composite Materials Made of Sol-Gel Silica and Agroindustrial Wastes of Rice, Barley, and Coffee Husks with Wood-Like Finishing

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