Thermo-physical properties of nanostructured lightweight fiber reinforced cementitious composites

Shoukry, H.; Kotkata, M. F.; Abo-El-Enein, S.A.; Morsy, Mohamed; Shebl, S. S.

doi:10.1016/j.conbuildmat.2015.10.188

Cited by 44 publications

(20 citation statements)

References 12 publications

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“…A incorporação de resíduos LV contribuiu com o aumento da resistência à tração e à compressão quando se compara o traço E90 com o traço E90LV. Esses resultados reforçam estudos anteriores que apontaram melhorias após a inserção de resíduos fibrosos e também de pesquisas que avaliaram individualmente a incorporação de resíduos de lã de rocha ou lã de vidro às argamassas [6,26,[29][30][31][32] Tabela VII -Caracterização das argamassas -estado endurecido (valores médios).…”

Section: Resultsunclassified

“…Assim, é possível compreender a influência da envoltória das edificações no desempenho térmico e nas condições de habitabilidade das edificações, uma vez que esta se relaciona com o conforto térmico proporcionado aos usuários [5]. Em vista disso, o emprego de argamassas leves pode, por meio da redução de parâmetros de condutividade, representar uma solução à medida que se aumenta a resistência térmica do sistema de vedação [6]. Acrescenta-se a preocupação com o desempenho das edificações, que foi expressa recentemente a partir de processos normativos que resultaram na publicação da norma ABNT NBR 15575:2013.…”

Section: Introductionunclassified

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Argamassas com resíduos para revestimento isolante térmico de parede pré-moldada de concreto

Passos

Carasek

2018

Cerâmica

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Resumo Inserido em contexto de preocupações com desempenho térmico e sustentabilidade na construção civil, este trabalho visou desenvolver argamassas com propriedades isolantes térmicas para revestimento de paredes pré-moldadas de concreto. O programa experimental avaliou três dosagens de argamassa com resíduo de poliestireno expandido (EPS) e resíduo da produção de placas isolantes termoacústicas (contendo fibras de lã de rocha, lã de vidro e vermiculita expandida), e uma dosagem de referência. Caracterizou-se o resíduo por meio de MEV, DRX, FRX e picnometria a gás hélio. Efetuaram-se ensaios das argamassas (estado fresco e endurecido), do revestimento aplicado (resistência de aderência e permeabilidade à água) e avaliação do desempenho térmico do sistema de vedação. Os resultados demonstraram potencial das argamassas com resíduos como revestimento isolante (valores de condutividade térmica até quatro vezes inferiores aos de referência). A inserção do resíduo com fibras otimizou propriedades mecânicas das argamassas e do revestimento (resistência à tração e de aderência).

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Section: Resultsunclassified

Section: Introductionunclassified

Argamassas com resíduos para revestimento isolante térmico de parede pré-moldada de concreto

Passos

Carasek

2018

Cerâmica

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“…From the combustion fuel used to heat the raw materials to sintering temperatures (1400-1600 C). The theoretical heat requirement for clinker-making is calculated to be about 1.75 ± 0.1 MJ per kg [5][6][7] . First step to reduce this source of pollution with reducing its amount in concrete, mortar and other construction purposes, using Supplementary cementations materials (SCMs) can achieve that were partially replacing by cement content, as Supplementary cementations materials can be used either as fillers or for their pozzolanic properties.…”

Section: Introductionmentioning

confidence: 99%

Contribution of Economic Nano-materials and Industry By-Products to the Fresh and Hardened Properties of Cement Mortars

Hodhod¹,

Salah²,

Khalil³

et al. 2020

International Journal of Engineering Research and Technology

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This study aims at evaluating the influence of low cost nano materials including; nano silica (NS) and nano clay (NC) and various industry by-products including; silica fume (SF), Fly ash (FA), and fine Air-Cooled Slag (FACS) as cement replacements on the compressive strength, flexural strength and rheological properties of cement mortars. The results revealed that, the investigated industrial by-products contribute to the strength development by various ratios at various replacement percentages. The best mechanical performance was obtained for the mortar incorporating 15 wt. % SF; remarkable enhancements by about 30.8 and 26.8 were obtained for the compressive and flexural strengths respectively as compared with the plain ordinary mortar. FACS showed insignificant contribution to both compressive and flexural strengths. Even at low levels of replacement; the nano-materials provide better enhancements of the mechanical strength. Incorporation of 3 wt. % NS into the cement mortar has increased the compressive strength by about 38.5%; while, the incorporation of 5 wt.% of activated NC has considerably increased the flexural strength by 59% as compared to the ordinary cement mortar at 28 days of hydration. The workability of the blended mortars decreases with the loading of silica fume, fine air cooled slag nano-silica and nano-clay while increases with using fly ash and marble dust. The nano materials showed noticeable improvement of the structural integrity and microstructure, confirming the enhanced durability characteristics.

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“…This is mainly because of the weakness of the polyolefin matrix and a lack of interfacial bonding between the hydrophilic wood and hydrophobic polyolefin matrix . Therefore, two primary approaches have been taken to improve the mechanical properties of WPCs: using coupling agents to enhance the interfacial adhesion and incorporating strong hybrid fillers including synthetic fiber, as well as inorganic particles to reinforce the system.…”

Section: Introductionmentioning

confidence: 99%

Reinforcement of wood flour/HDPE composite with a copolyester of p‐hydroxy benzoic acid and 2‐hydroxy‐6‐naphthoic acid

Hao

Zhou

Wang

et al. 2018

J of Applied Polymer Sci

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Various contents of copolyester of p-hydroxy benzoic acid and 2-hydroxy-6-naphthoic acid (HBA/HNA) were compounded with high-density polyethylene (HDPE). The reinforcing effect on the properties of the resulting wood/HDPE composites was determined. The results showed that incorporating HBA/HNA copolyester led to an increase by 340 and 30% in the impact strength of blends and composites, respectively. Improved toughness was also evidenced by the rough impact fractured surface observed by scanning electron microscope. HBA/HNA copolyester had a positive effect on both tensile and flexural properties in blends and composites. The presence of HBA/HNA copolyester enhanced the crystallization and melting temperature, though it did not change the crystal structure of the blends or composites. The dynamic mechanical property conformed with static property. These findings demonstrated that the incorporation of low amounts of HBA/HNA copolyester can substantially reinforce the wood flour/HDPE composites.

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Thermo-physical properties of nanostructured lightweight fiber reinforced cementitious composites

Cited by 44 publications

References 12 publications

Argamassas com resíduos para revestimento isolante térmico de parede pré-moldada de concreto

Argamassas com resíduos para revestimento isolante térmico de parede pré-moldada de concreto

Contribution of Economic Nano-materials and Industry By-Products to the Fresh and Hardened Properties of Cement Mortars

Reinforcement of wood flour/HDPE composite with a copolyester of p‐hydroxy benzoic acid and 2‐hydroxy‐6‐naphthoic acid

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