Effects of fiber hybridization in advanced cementitious composites durability in humid and aggressive environments

Pacheco, Fernanda; Christ, Roberto; Quinino, Uziel Cavalcanti de Medeiros; Tutikian, Bernardo Fonseca

doi:10.1590/s1517-707620180003.0505

Cited by 8 publications

(11 citation statements)

References 18 publications

(17 reference statements)

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“…The loss of weight due to the marine water was improved up to 47% with the incorporation of hybrid fibres, whereas the loss in compressive strength was improved by 66%. The loss in mass and compressive strength of HTGPC was lower than the TGPC, which is similar to the sample treated in the acid environment [44,52].…”

Section: Marine Attacksupporting

confidence: 61%

“…The samples with minimal weight reduction values were those with 1% steel fibre and 0.2% polypropylene fibres, indicating that fibre hybridisation is possible for all environment exposure conditions. The samples without fibres exhibit the highest weight reduction, proving that fibres contribute to the durability of concrete in an acidic environment [52]. Figure 9 shows the loss in compressive strength due to acid attack.…”

Section: Acid Attackmentioning

confidence: 96%

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Effect of Hybrid Fibres on the Durability Characteristics of Ternary Blend Geopolymer Concrete

2021

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The need to develop sustainable concrete in the civil infrastructure industry increases day by day, resulting in new eco-friendly materials such as geopolymer concrete. Geopolymer concrete is one of the eminent alternatives to conventional concrete for sustainable development by reducing the carbon footprint. Ternary blend geopolymer concrete (TGPC) is a sustainable and environmentally friendly concrete produced with three different source materials to form a binder. The main advantage of TGPC is that it possesses densely packed particles of different shapes and sizes, which results in improved properties. This paper deals with the experimental investigations to evaluate the durability properties of plain and hybrid fibre reinforced TGPC. The durability of concrete is defined as the ability to withstand a safe level of serviceability and different environmental exposure conditions without any significant repair and rehabilitation throughout the service life. Conventional concrete is vulnerable to cracking due to its low tensile and durability properties. The TGPC considered in this work consists of fly ash, GGBS and metakaolin as source materials, selected mainly based on the material’s silica and alumina content, shape, size, and availability. The grade of concrete considered was M55. The main variables considered in this study were the proportions of crimped steel fibres (Vf), viz., 0.5% and 1% and proportions of polypropylene fibres (Vp)viz., 0.1%, 0.15%, 0.20% and 0.25%. The durability properties like water absorption, sorptivity, resistance to marine attack, acid attack, sulphate attack, and abrasion were studied in this investigation. The experimental test results were compared with the requirements provided in the standard/literature and found to be well within limits. The study also indicates that the inclusion of fibres in a hybrid form significantly improves the durability parameters of TGPC. The TGPC with 1% steel fibre and 0.15% polypropylene fibre performs better than the other combination of fibres considered in this experimental investigation.

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Section: Marine Attacksupporting

confidence: 61%

Section: Acid Attackmentioning

confidence: 96%

Effect of Hybrid Fibres on the Durability Characteristics of Ternary Blend Geopolymer Concrete

2021

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“…In the case of mortar between blocks heated to this temperature, system rupture would occur due to mortar squashing even if the blocks remained unbroken. Ingham (2009) and Pacheco et al (2018) agreed that compression resistance decreased in structural masonry due to mortar deterioration under heating.…”

Section: Introductionmentioning

confidence: 78%

Experimental analysis of fire resistance of mortar coatings on structural masonry walls

Prager

Périco

Poleto

et al. 2020

rdlc

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The discussion on fire safety is necessary in Brazilian buildings. Current legislation requires construction with compartmentalized areas separated by walls with structural ceramic blocks capable of resisting fire for an amount of time pre-determined in norm NBR 14432 (ABNT, 2001). However, a lack of building standards requires experimental tests according to NBR 5628 (ABNT, 2001) to determine the necessary configuration to achieve fire resistance. For this purpose, this study analyzed the effect of fire on structural walls covered with a mortar coating. Experiments were conducted in real scale in a standardized vertical oven and the fire growth curve of ISO 834 (ISO, 1999). Three types of walls were tested, each with a different mortar coating: (a) lime; (b) 0.6 kg/m³ polypropylene fiber and 1.2 kg/m³ polypropylene fiber. The mortar coatings were 1.5 cm thick on the side facing the fire and 2.5 cm thick in the outside. The wall was composed of structural blocks measuring 14 cm x 19 cm x 29 cm. Fire experiments evaluated the structure stability, impermeability to hot gases and smoke and thermal insulation of each sample. Results showed that the structural system with 1.2 kg/m³ polypropylene fiber mortar coating obtained the best thermal insulation effect with the longest fire resistance time of 176 min.

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“…Fiber geometry is intrinsically linked to composite quality. The longer the fiber length or the smaller its diameter, the more the fiber aspect ratio length/diameter (l/d) improves, which has a positive effect on the mechanical properties of composites [ 61 ]. Nonetheless, decreasing the fiber length more than the critical length (smallest possible length for load transfer) implies a reduction in the transfer of tension from the matrix to the fiber since short fibers are not the most indicated for reinforcement material [ 62 ].…”

Section: Properties and Importance Of Use In Cementitious Materialsmentioning

confidence: 99%

A Review of the Use of Natural Fibers in Cement Composites: Concepts, Applications and Brazilian History

Rocha¹,

Júnior²,

Marvila³

et al. 2022

Polymers

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The use of natural lignocellulosic fibers has become popular all over the world, as they are abundant, low-cost materials that favor a series of technological properties when used in cementitious composites. Due to its climate and geographic characteristics, Brazil has an abundant variety of natural fibers that have great potential for use in civil construction. The objective of this work is to present the main concepts about lignocellulosic fibers in cementitious composites, highlighting the innovation and advances in this topic in relation to countries such as Brazil, which has a worldwide prominence in the production of natural fibers. For this, some common characteristics of lignocellulosic fibers will be observed, such as their source, their proportion of natural polymers (biological structure of the fiber), their density and other mechanical characteristics. This information is compared with the mechanical characteristics of synthetic fibers to analyze the performance of composites reinforced with both types of fibers. Despite being inferior in tensile and flexural strength, composites made from vegetable fibers have an advantage in relation to their low density. The interface between the fiber and the composite matrix is what will define the final characteristics of the composite material. Due to this, different fibers (reinforcement materials) were analyzed in the literature in order to observe their characteristics in cementitious composites. Finally, the different surface treatments through which the fibers undergo will determine the fiber–matrix interface and the final characteristics of the cementitious composite.

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Effects of fiber hybridization in advanced cementitious composites durability in humid and aggressive environments

Cited by 8 publications

References 18 publications

Effect of Hybrid Fibres on the Durability Characteristics of Ternary Blend Geopolymer Concrete

Effect of Hybrid Fibres on the Durability Characteristics of Ternary Blend Geopolymer Concrete

Experimental analysis of fire resistance of mortar coatings on structural masonry walls

A Review of the Use of Natural Fibers in Cement Composites: Concepts, Applications and Brazilian History

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