Mechanical autogenous recovery and crack sealing of natural curauá textile reinforced concrete

Souza, Letícia Oliveira de; Souza, Lourdes Maria Silva de; Silva, Flávio de Andrade

doi:10.1016/j.conbuildmat.2019.117476

Cited by 18 publications

(6 citation statements)

References 64 publications

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“…To investigate the degradation of facades and the factors involved in its process, different considerations are required, mainly regarding climate variables. In Brasília, DF, Brazil, in general, North-facing facades present potentially more significant levels of degradation resulting from exposure to a set of active agents [12,15,16]. From another perspective, high exposure to possible climatic degradation agents does not necessarily imply higher levels of degradation.…”

Section: Facade Degradationmentioning

confidence: 99%

“…The building exposure conditions can contribute to the reduction of performance, consequently affecting the degradation and service life of the building facade [15,20,21]. Building elements are affected by an evolutionary process of degradation over time, mainly related to the conditions of exposure to the environment and the agents and mechanisms of degradation [22][23][24].…”

Section: Degradation Agents and Mechanismsmentioning

confidence: 99%

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Influence of the Exposure Degree on the Degradation of Facades of Buildings in Brasília—Brazil

de Souza,

Romeiro,

Bauer

2024

Buildings

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Facades play an important role in building performance and durability since these systems, one of the most external elements, are highly exposed to climatic degradation agents. The degradation process evolves over time, causing anomalies and performance failures, ultimately reducing the building’s service life. When directly influenced by the agents and mechanisms, the expected degradation of the systems that constitute the facade depends on the degree of exposure to the agents and how the degradation mechanisms act under different conditions. Given the relevance of the topic and the need for information on the degradation process of facade elements, this investigation aims to evaluate the relationship between the degradation measured in buildings in Brasília and the exposure degree of the facades, focusing on climatic degradation agents. The facades are evaluated regarding exposure to driving rain and solar radiation and classified into two groups: high exposure and low exposure. The sample degradation was quantified using the Degradation Measurement Method (DMM) and the General Degradation Factor (FGD). This methodology showed both the behavior models for the different exposure groups and allowed us to calculate estimated service life (ESL) values of approximately 26 and 35 years for facades with high and low exposures, respectively. The FGD values are higher for facades with high exposure compared to those with lower exposure. Additionally, North-oriented facades are the most critical, exhibiting the highest degradation levels due to the greater intensity of driving rain and incident solar radiation.

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Section: Facade Degradationmentioning

confidence: 99%

Section: Degradation Agents and Mechanismsmentioning

confidence: 99%

Influence of the Exposure Degree on the Degradation of Facades of Buildings in Brasília—Brazil

de Souza,

Romeiro,

Bauer

2024

Buildings

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“…To our knowledge the are the only Amazon NLFs currently applied as reinforcements of cementitious composites. Among these fibers, açai [52], curaua [53,54], guaruman [55] and piassava [56] are native to the Amazon region, while the others are only locally cultivated; bamboo [57,58], jute [53,59] and sisal [58,59] that are originally from distinct regions of the world, such as East Asia, Middle Asia, Africa and North America. The chemical composition of NLFs has a great influence on their mechanical properties and durability.…”

Section: Anatomy Of Amazon Natural Lignocellulosic Fibers (Nlfs)mentioning

confidence: 99%

Potential of Using Amazon Natural Fibers to Reinforce Cementitious Composites: A Review

Lima¹,

Azevedo²,

Marvila

et al. 2022

Polymers

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The engineering application of natural lignocellulosic fibers (NLFs) has been intensifying all over the world due to their low cost and abundance, as well as their being eco-friendly and presenting favorable technological properties in polymeric and cementitious composites. Brazil, especially the Amazon region, owing to its climate and geographic position, has an abundant variety of NLFs that are still unexplored with great potential for use in various composite materials and applications such as civil construction, automobile parts and armor. Therefore, this review aims to establish a parallel between the technological properties of cementitious composites reinforced with Amazon NLFs, both in fresh and hardened states, and to analyze, compare results and contribute to a better understanding of the similarities and differences between the types of reinforcements. A relevant contribution of this review is the possibility of improving knowledge about Amazon NLFs, showing their potential for application in eco-friendly materials, in addition to contributing to studies with new NLFs not yet applied in composite. For this, it was necessary to carry out a literature survey on the physical, chemical and mechanical properties of cementitious composites reinforced with NLFs, in addition to analyzing case studies involving fibers such as curaua, açai, bamboo, jute and sisal. It can be concluded that the physical and chemical characteristics of the Amazon NLFs directly influence the technological properties of cementitious compounds, such as mechanical strength and water absorption. However, there might be a need for surface treatment aimed at improving adhesion and durability of the cementitious composite. Finally, some suggestions for future research work are highlighted in order to show the need to continue investigations on the application of Amazon NLFs in cementitious composites.

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“…The water-binder ratio, which can play an essential role on the durability of the matrix and the composite system [8,10,12], is also usually higher in these composites (to enhance workability). The addition of fly ash, metakaolin, silica fume and blast furnace slag can reduce the alkalinity of the cement pore solution [8] or enhancement of the self-healing properties [46], thus enhancing the durability of glass-based TRCs against alkaline corrosion. Mobasher et al [47] showed the addition of fly ash (60% replacement with cement) and 5% silica fume could enhance the mechanical properties of AR-glass TRCs by increasing the density of the matrix and decreasing the calcium hydroxide at the interface transition zone [47].…”

Section: Additivesmentioning

confidence: 99%

Durability of Textile Reinforced Concrete: Existing Knowledge and Current Gaps

2021

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This paper aims to provide a review of the current literature on the durability of textile-reinforced concrete and mortar (TRC/TRM) composites. Most previous studies have focused on the role of chemical attacks, freeze-thaw conditions, and high temperatures on the mechanical performance of these composites. Information on the long-term performance of TRCs under synergistic action of mechanical and environmental loads is scarce. Considering the variety of fabrics and matrices used for the production of TRC composites, the existing data are still very limited and comprehensive studies are needed in this field. Additionally, due to the lack of standard procedures, different approaches are often followed for durability or post-ageing mechanical tests, or sufficient data on the curing and post-ageing preparation procedures followed are not provided. These have led to incompatibility of the existing data and in some cases contradictory results on the durability of these materials.

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Mechanical autogenous recovery and crack sealing of natural curauá textile reinforced concrete

Cited by 18 publications

References 64 publications

Influence of the Exposure Degree on the Degradation of Facades of Buildings in Brasília—Brazil

Influence of the Exposure Degree on the Degradation of Facades of Buildings in Brasília—Brazil

Potential of Using Amazon Natural Fibers to Reinforce Cementitious Composites: A Review

Durability of Textile Reinforced Concrete: Existing Knowledge and Current Gaps

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