Technological performance of açaí natural fibre reinforced cement-based mortars

Azevedo, Afonso Rangel Garcez de; Marvila, Markssuel Teixeira; Tayeh, Bassam A.; Cecchin, Daiane; Pereira, Artur Camposo; Monteiro, Sérgio Neves

doi:10.1016/j.jobe.2020.101675

Cited by 114 publications

(57 citation statements)

References 28 publications

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“…As for the optimum levels of incorporated air, some authors suggest the use of this parameters between 7 and 17% [ 18 , 69 ]. It aims that the mortars do not present high values of incorporated air.…”

Section: Resultsmentioning

confidence: 99%

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Rheological and the Fresh State Properties of Alkali-Activated Mortars by Blast Furnace Slag

Marvila¹,

Azevedo²,

Matos

et al. 2021

Materials

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The fresh and rheological properties of alkali mortars activated by blast furnace slag (BFS) were investigated. Consistency tests, squeeze flow, dropping ball, mass density in the hardened state, incorporated air, and water retention were performed. Mortars were produced with the ratio 1:2:0.45 (binder:sand:water), using not only ordinary Portland cement for control but also BFS, varying the sodium content of the activated alkali mortars from 2.5 to 15%. The results obtained permitted understanding that mortars containing 2.5 to 7.5% sodium present a rheological behavior similar to cementitious mortars by the Bingham model. In turn, the activated alkali mortars containing 10 to 15% sodium showed a very significant change in the properties of dynamic viscosity, which is associated with a change in the type of model, starting to behave similar to the Herschel–Bulkley model. Evaluating the properties of incorporated air and water retention, it appears that mortars containing 12.5% and 15% sodium do not have compatible properties, which is related to the occupation of sodium ions in the interstices of the material. Thus, it is concluded that the techniques used were consistent in the rheological characterization of activated alkali mortars.

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Section: Resultsmentioning

confidence: 99%

“…In addition, the durability of these mortars is superior to cementitious materials, as indicated in the literature [ 69 ]. This happens due to the formation of tobermorite (C-A-S-H), which presents network cross-connections, providing the mortars with superior performance as compared with hydrated cement with C-S-H networks [ 4 , 72 ].…”

Section: Resultsmentioning

confidence: 99%

Rheological and the Fresh State Properties of Alkali-Activated Mortars by Blast Furnace Slag

Marvila¹,

Azevedo²,

Matos

et al. 2021

Materials

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“…The problem of solid waste is one of the great modern challenges, since in order to comply with the environmental legislations, industries end up discarding their waste in landfills, which despite being legally acceptable, it is far from being a good solution. The landfills can generate at large high economic and environmental costs (such as scarcity of disposal area and raw materials, and potential leaching of hazardous liquids in waters) 6‐9 . Thus, many industries have been concerned with the issues of solid waste generated by them, investing in research and methodologies that enable the reinsertion of these materials in another production chain 10 …”

Section: Introductionmentioning

confidence: 99%

“…The landfills can generate at large high economic and environmental costs (such as scarcity of disposal area and raw materials, and potential leaching of hazardous liquids in waters). [6][7][8][9] Thus, many industries have been concerned with the issues of solid waste generated by them, investing in research and methodologies that enable the reinsertion of these materials in another production chain. 10 One important economic segment that is closely linked to the reuse of industrial solid waste is the industries that produce civil construction materials, such as the production of red ceramics and cementitious ceramics, which are applied in different stages of a building.…”

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confidence: 99%

Circular economy in cementitious ceramics: Replacement of hydrated lime with a stoichiometric balanced combination of clay and marble waste

Marvila¹,

Azevedo

Alexandre³

et al. 2020

Int J Applied Ceramic Tech

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Cementitious ceramics, produced from the hydration of cement and hydrated lime, are responsible for a great deal of damage to the environment due to the high emission of CO 2 that occurs in the production of cement and lime. Therefore, the objective of this work was to substitute the hydrated lime with a combination of clay residue and marble waste extracted from ceramic and ornamental rock producing industries, respectively, which constitutes a circular economy for the ceramic industry related to masonry applications. Ceramics were produced in the proportion 1:1:6:1.5 (cement:lime:sand:water), through the molding procedure, and were studied by replacing hydrated lime with 100% clay residue and 100% marble residue, in addition to stoichiometric calculated parts of marble to clay. The molar ratios used were 1:1, 1:2, and 2:1 (marble:clay). Tests of consistency, incorporated air content, water retention, compression strength, density, water absorption by capillarity, adhesion, and electrical resistivity were performed. The results obtained demonstrate that the use of residue of marble and clay together, as long as they are correctly balanced, provides a high gain in technological properties, enabling the circular economy of cementitious ceramics, mainly for the composition 1 marble:1clay, which presented the best properties, both in the fresh and hardened state. The economic analysis carried out proved the financial gains for the industrial sectors involved (civil construction, ornamental rock, and ceramic).

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“…Chajes et al [ 17 ] have examined the effect of surface preparation, different kinds of adhesives, as well as concrete strength utilizing the single shear testing procedure. de Azevedo et al [ 22 ] conducted experimental studies on the technological performance of açaí natural fiber-reinforced cement-based mortars. Azevedo et al [ 23 ] also conducted research on the development of mortar for laying and coating with pineapple fiber.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Bond Parameters on the Mechanical Properties of FRP and Concrete Interface

et al. 2020

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This paper presents double shear tests performed to investigate factors influencing the bond behavior between basalt fiber-reinforced polymer (BFRP), glass fiber-reinforced polymer (GFRP) laminate, and concrete blocks. In detail, thirty-six twin concrete blocks strengthened with the aforementioned FRP types were tested to evaluate the influence of FRP length, width, and thickness, and their bonding behavior. The 2D-DIC (digital image correlation) technique and several strain gauges bonded along the laminate were used to measure the strain distributions of the FRP-to-concrete interface. The failure mode, ultimate load, load–slip, strain distribution, and bond–slip relationships between the laminates and concrete were analyzed. Furthermore, bond–slip curves were compared with some other existing literature models. The results from the experiment showed that the ultimate load, peak bond stress, and slip increased with the increase in the BFRP and GFRP laminates length, width, and thickness. The values of peak shear stress and the corresponding maximum shear slip were significantly different because of the above-mentioned factors’ influence on them. The bond interface that contributes to the bearing of the shear load may grow to an extent and later shift from the loaded end when debonding progresses. Finally, the fractured surfaces of the failed FRP laminates were examined using scanning electron microscope (SEM), revealing that FRP rupture, debonding in concrete, and debonding in an adhesive–concrete interface were the main failure types.

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Technological performance of açaí natural fibre reinforced cement-based mortars

Cited by 114 publications

References 28 publications

Rheological and the Fresh State Properties of Alkali-Activated Mortars by Blast Furnace Slag

Rheological and the Fresh State Properties of Alkali-Activated Mortars by Blast Furnace Slag

Circular economy in cementitious ceramics: Replacement of hydrated lime with a stoichiometric balanced combination of clay and marble waste

Effect of Different Bond Parameters on the Mechanical Properties of FRP and Concrete Interface

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