Composites of scrap tire rubber particles and adhesive mortar – Noise insulation potential

Corredor-Bedoya, A.C.; Zoppi, Rita Aparecida; Serpa, Alberto Luiz

doi:10.1016/j.cemconcomp.2017.05.007

Cited by 55 publications

(28 citation statements)

References 40 publications

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“…De maneira coincidente à literatura [29,30,31,32], o aumento da dimensão dos poros gerados pela adição da casca de arroz acarretou em uma melhoria significativa na absorção acústica do produto. Por outro lado, os resultados de isolamento acústico não foram estatisticamente diferentes aos resultados da matriz, também coincidente à literatura [30,31,33].…”

Section: Conclusõesunclassified

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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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Section: Conclusõesunclassified

“…Além disso, dos 22 pontos analisados apenas em um houve sobreposição das faixas de dispersão, o que indica que há diferença estatisticamente significativa entre os valores médios. Segundo[29,30] a melhora do desempenho ocorre em virtude do aumento da dimensão dos poros, fato esse observado após a adição da casca de arroz (CA) na matriz (Figura 4).…”

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

et al. 2019

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“…Through analysing the stress-strain curves of cementitious composites with different contents of rubber fibres, Dong et al 15 observed the larger loops generated with increase of stress cycles and magnitudes, and qualitatively concluded the better energy absorption and damping properties for the composites with more rubber fibres. In addition, by introducing the impedance tube method on the rubberized concrete, Corredor-Bedoya et al 30 observed that the cement mortar with 15% rubber crumbs represented higher sound transmission losses, while composites with 25% rubber particles possessed higher sound absorption coefficient.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Conductive Properties of Smart Cementitious Composites with Conductive Rubber Crumbs

Dong¹,

Li²,

Vessalas³

et al. 2020

ES Mater.Manuf.

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Massive waste rubber products become very challenging because the disposal generates negative impacts on the ecological environments. The effect of conductive rubber crumbs replacing the fine aggregate on the physical, mechanical properties and electrical characteristics of cement composites were investigated in this study. The results show that the flowability of cement mortar increased when the rubber crumbs replacement rate lower than 10%, but decreased when the substitution rate higher than 10%. The compressive strengths of rubberized mortar were decreased with the increase of amount of rubber crumbs. However, as the amount of rubber crumbs increased, less reduction on compressive strength was observed for the cement mortar at water-to-binder (W/B) ratio of 0.42, because of the improved flowability. In terms of the electrical properties, both the near-surface resistivity and the volumetric resistivity of rubberized mortar were increased with the curing age because of the continuing cement hydration. The near-surface resistivity of cement mortar was limitedly affected by conductive rubber crumbs, while the volumetric resistivity did gradually decrease with the increase of rubber content. The developed cement mortar containing recycled conductive rubber crumbs can be used for manufacturing self-sensing concrete used for structural health monitoring..

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“…Some researchers have studied the physical and mechanical properties of CRM . And some researchers have also studied the sound insulation properties of CRM . Moreover, some researchers have found that scanning electron microscopy images and image processing techniques are contributing to the understanding of the influence of particles in the main physical and mechanical properties of cementitious composites.…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5][6][7] And some researchers have also studied the sound insulation properties of CRM. 8,9 Moreover, some researchers have found that scanning electron microscopy images and image processing techniques are contributing to the understanding of the influence of particles in the main physical and mechanical properties of cementitious composites. Voids derived from the use of rubber as aggregate in mortar can be analyzed and distinguished by scanning electron microscopy technique and image processing techniques.…”

Section: Introductionmentioning

confidence: 99%

Fracture monitoring and damage pattern recognition for carbon nanotube‐crumb rubber mortar using acoustic emission techniques

Han

et al. 2019

Struct Control Health Monit

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Summary This article presents the results from an experimental study on the application of acoustic emission (AE) analysis to assess the strengthening effect of carbon nanotubes and monitoring the damage progression of carbon nanotube‐crumb rubber mortar (CNT‐CRM) under three‐point flexural tests. Normal cement mortar and CRM were also tested for the comparison with CNT‐CRM. The various AE statistical parameters were employed for the analysis, and the following conclusions were drawn: (a) The incorporation of carbon nanotubes can increase the strength and ductility of CRM. (2) The damage and fracture processes of CNT‐CRM can be well analyzed according to the double evaluation index of cumulative number of hits and cumulative energy. (3) Ib‐value analysis can provide a good early warning of structural damage for CNT‐CRM. (4) The peak frequency and the average frequency can effectively distinguish the AE signals of different damage modes in CNT‐CRM. The results obtained in this article demonstrate that the AE technique can provide valuable information for a better understanding of micro‐cracking and fracture monitoring of CNT‐CRM.

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Composites of scrap tire rubber particles and adhesive mortar – Noise insulation potential

Cited by 55 publications

References 40 publications

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

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

Mechanical and Conductive Properties of Smart Cementitious Composites with Conductive Rubber Crumbs

Fracture monitoring and damage pattern recognition for carbon nanotube‐crumb rubber mortar using acoustic emission techniques

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