Cristina Frazão

Cristina Frazão
CiviTest

Doctor in Civil Engineering

About

26
Publications
3,609
Reads
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375
Citations
Citations since 2017
12 Research Items
351 Citations
2017201820192020202120222023020406080
2017201820192020202120222023020406080
2017201820192020202120222023020406080
2017201820192020202120222023020406080
Additional affiliations
January 2012 - February 2015
University of Minho
Position
  • Researcher
January 2012 - November 2015
University of Minho
Position
  • Researcher

Publications

Publications (26)
Article
This paper presents a new pre-fabricated lightweight slab system where the relatively high post-cracking tensile capacity of steel fibre reinforced concrete (SFRC) is combined with the high ductility and tensile strength of optimized shape profiles made by cold formed steel sheets for a synergetic result in terms of structural performance. The SFRC...
Conference Paper
A exposição de estruturas de betão a temperaturas elevadas, como no caso de incêndio, conduz, entre outros, a uma degradação das propriedades mecânicas do material. Dependendo da temperatura e do tempo de exposição, esta ocorrência acidental potencia a ocorrência de fissuração e destacamento do betão – spalling (por vezes de forma explosiva), poden...
Article
The use of recycled materials and industrial by-products as sustainable constituents of cement-based materials could be an environmentally and technically promising solution for application to structural elements. In the present work, the technical and environmental impact of using recycled steel fibers as an alternative to industrial steel fibers...
Chapter
Within the scope of the “NG_TPfib” R&D project, Exporplás and CiviTest have, in the recent past, developed a new typology of polypropylene fibers for the production of urban furniture of high durability by eliminating conventional steel reinforcements susceptive to corrosion. This reinforcement replacement strategy also allows the development of li...
Article
Full-text available
The main purpose of the present work is to study the mechanical behavior and durability performance of recycled steel fiber reinforced concrete (RSFRC) under a chloride environment. To this end, the effect of chloride attack on the load-carrying capacity of pre-cracked RSFRC round panels is investigated by performing round panel tests supported on...
Article
Full-text available
For structural elements exposed to chloride environments, an important aspect of Recycled Steel Fiber Reinforced Concrete (RSFRC) durability is the corrosion resistance. In the present work, an experimental program was carried out to evaluate the long-term effects of chloride attack on the post-cracking behavior of RSFRC by performing splitting ten...
Thesis
Recycled Steel Fibers (RSF) derived from the tire recycling industry have been successfully used in concrete to improve its post-cracking load bearing capacity and energy absorption performance. For structural elements exposed to chloride environments, an important aspect of Recycled Steel Fiber Reinforced Concrete (RSFRC) durability is the corrosi...
Article
Under chloride attack, an important aspect of Recycled Steel Fiber Reinforced Concrete (RSFRC) durability is its corrosion resistance. However, the insufficient knowledge on this domain contributes for a conservative design philosophy, which can compromise the cost competitiveness of RSFRC. In the present work, an experimental program was performed...
Article
This research proposes the development of an innovative structural panels based on the use of thin outer layers of Sisal Fiber-Cement Composites (SiFCC) together with a core layer of Polypropylene Fiber-Reinforced Lightweight Concrete (PFRLC). The influence of sisal fibers was studied in two different ways, short sisal fibers (50 mm) randomly distr...
Chapter
Pneumatic tyres are nowadays among the most widespread industrial products and, hence, handling tyres that have reached their end-of-life is indeed a critical issue. This Chapter provides readers with the key facts about tyre production and consumption. Particularly, it describes the raw materials which they are made from, and summarises the main c...
Article
In the present study, the effectiveness of fibres in transferring stress across cracks under a sustained load was assessed. Single fibre pull-out creep tests were performed, in which fibre slip was monitored as a function of the time. The influence of the fibre orientation angle (0, 30 and 60°), as well as pre-imposed fibre slip levels, spr, 0.3 an...
Conference Paper
Full-text available
O presente artigo apresenta os resultados obtidos num programa experimental de caracterização de três argamassas de matriz cimentícia reforçadas com diferente tipo de fibras, nomeadamente, fibras de poliacrilonitrila (PAN), vidro (GF), polipropileno (PP) e de álcool polivinílico (PVA). A avaliação do desempenho das fibras como reforço efetivo de ma...
Conference Paper
This research proposes the development of innovative structural sandwich panels composed of thin outer wythes of Sisal Fiber-Cement Composites (SiFCC) and a core layer of Polypropylene FiberReinforced Lightweight Concrete (PFRLC). Sisal fibers were used in two different lengths, short sisal fibers (50 mm) randomly distributed in the matrix; and lon...
Conference Paper
Steel fibers are used in concrete to improve its mechanical properties, such as postcracking load bearing capacity and energy absorption performance, and also to limit the crack width, with beneficial consequences of concrete durability. Steell fiber reinforced concrete (SFRC) structures are subjected to chloride and carbonation penetration that ca...
Conference Paper
By taking advantage of the appropriate use of cement and polymer based materials and advanced computational tools, a pre-fabricated affordable house was built in a modular system. Modular system refers to the complete structure that is built-up by assembling pre-fabricated sandwich panels composed of steel fibre reinforced self-compacting concrete...
Conference Paper
Full-text available
Quando adicionadas ao betão, a possibilidade de corrosão das fibras de aço, devido à penetração de cloretos e ação da carbonatação, é um parâmetro de durabilidade no betão auto-compactável reforçado com fibras de aço (BACRFA) que requer especial atenção. No BACRFA fendilhado, a corrosão tende a ocorrer nas fibras de aço que atravessam as fissuras,...
Article
The present paper deals with the experimental assessment of the effectiveness of steel fibre reinforcement in terms of punching resistance of centrically loaded flat slabs, and to the development of an analytical model capable of predicting the punching behaviour of this type of structures. For this purpose, eight slabs of 2550 × 2550 × 150 mm3 dim...
Article
Fiber reinforced concrete structures are subjected to chloride and carbonation penetration that could initiate corrosion of steel fibers, with eventual pernicious consequences in terms of structural and durability performance. Cracks in concrete are known to hasten initiation of steel corrosion in reinforced concrete structures. The investigation o...
Conference Paper
Full-text available
A durabilidade é um dos aspetos mais importantes que o betão deve garantir, devido à sua fundamental incidência na vida útil das estruturas. Devido ao número crescente de estruturas degradadas prematuramente, a durabilidade das estruturas de betão tem sido uma preocupação constante no meio técnico da construção. As estruturas de betão reforçado com...
Conference Paper
Foi desenvolvida uma argamassa de ultra elevada ductilidade reforçada com fibras (FRCC) para uma nova técnica de reforço de estruturas existentes. São apresentados os estudos de caracterização do material, do ponto de vista mecânico (compressão e flexão), durabilidade (absorção de água por capilaridade, permeabilidade ao ar e à água, retração por s...
Conference Paper
Full-text available
A durabilidade é um dos aspetos mais importantes que o betão deve garantir devido à sua fundamental incidência na vida útil das estruturas.Para os betões convencionais, sem adição de fibras de aço, existem indicadores de durabilidade que são já de utilização corrente. No entanto, para o betão auto-compactável reforçadocom fibras de aço (BACRFA) a...
Thesis
Durability is one of the most important aspects of concrete due to its fundamental incidence in the serviceability working conditions of structures. Research on the durability of steel fiber reinforced self compacting concrete (SFRSCC) is still scarse, particularly in the aspects of the corrosion resistance, which is treated in an incipient form, g...
Conference Paper
Full-text available
For conventional concrete without steel fibers, although still an aspect under discussion, there are some commonly used durability indicators. However, for steel fiber reinforced self-compacting concrete (SFRSCC) literature is sparse and the aspects of durability, particularly corrosion resistance, still deserve deeper research, mainly the corrosio...

Network

Cited By

Projects

Projects (4)
Project
Innovative construction system for fully prefabricated lightweight slab of high behaviour performance
Project
The project "NG_TPfib - New Generation of Fibers for the Reinforcement of Cement Matrix Materials" is promoted by the companies Exporplás and CiviTest and funded by the European Regional Development Fund (POCI 01 0247 FEDER 033719) through the Operational Competitiveness and Internationalization Program. It aims to develop a new generation of thermoplastic fibers for the reinforcement of cementitious matrix materials in the civil construction market.
Project
The EcOffshoreBE project’s main goal is the creation of a joint R&D Unit between CiviTest (the project leader) and University of Minho (UMinho), represented by its Departments of Biology, Industrial Electronics, Polymer Engineering and Civil Engineering. This new collaborative framework aims at reinforcing the internal R&D competences of both CiviTest and UMinho for the future, post-project, development of high-performance cement-based materials (more durable and eco-sustainable) for energy production offshore maritime structures. By setting a medium/long-term strategic partnership, these entities purport to gather the adequate/necessary conditions for the joint planning of projects that will allow the development of new products and significant scientific and technological advances, leveraged by this project’s sharing, mobility and exchange of resources between both entities, as well as transfer and sharing of technology and knowledge. Particularly, the R&D Unit will study the problems associated with maritime environmental exposure of concrete in offshore structures (especially wind farms). The decrease in its mechanical resistance, derived from physical-chemical phenomena taking place on its micro-structure, leads to the shortening of its life-cycle demanding high maintenance costs, limiting, thusly, its competitiveness. This situation limits the most desired exploitation of the potential of offshore energy production (e.g., offshore windfarms), an area of most special interest for the smart specialisation of the County and the Northern Region in particular.