scholarly journals Can Polyolefin Fibre Reinforced Concrete Improve the Sustainability of a Flyover Bridge?

2018 ◽  
Vol 10 (12) ◽  
pp. 4583 ◽  
Author(s):  
Alejandro Enfedaque ◽  
Marcos Alberti ◽  
Jaime Gálvez ◽  
Marino Rivera ◽  
José Simón-Talero
Keyword(s):  
Reinforced Concrete ◽  
Value Function ◽  
Fibre Reinforced Concrete ◽  
Function Concept ◽  
Environmental Aspects ◽  
The Past ◽  
Steel Bars ◽  
Value Model ◽  
The Value Function ◽  
Reinforcement Configuration

The use of polyolefin fibre reinforced concrete (PFRC) as an alternative for reducing the reinforcing steel bars employed in reinforced concrete has become real in the past years. This contribution analyses the improvements in sustainability that a change in the aforementioned reinforcement configuration might provide in a flyover bridge. Economic, environmental and social parameters of both possibilities were studied by means of the integrated value model for sustainable assessment. Such model, which acronym is MIVES (Modelo Integrado de Valor para una Evaluación Sostenible, MIVES), is a multi-criteria decision-making method based on the value function concept and the seminars delivered by experts. The results of the MIVES method showed that the use of PFRC in combination with reinforced concrete (RC) has a sustainability index 22% higher. An analysis of the parameters that form this evaluation shows that there are no remarkable differences in the financial costs between the two possibilities studied. Nevertheless, social and environmental aspects provide with a better qualification the option of building a bridge by using PFRC combined with RC.

scholarly journals Can Polyolefin Fibre Reinforced Concrete Improve the Sustainability of a Flyover Bridge?

2018 ◽  
Author(s):  
Alejandro Enfedaque ◽  
Marcos G. Alberti ◽  
Jaime C. Galvez ◽  
Marino Rivero ◽  
Jose Simon-Talero
Keyword(s):  
Reinforced Concrete ◽  
Value Function ◽  
Fibre Reinforced Concrete ◽  
Function Concept ◽  
Environmental Aspects ◽  
The Past ◽  
Steel Bars ◽  
Value Model ◽  
The Value Function ◽  
Reinforcement Configuration

The use of polyolefin fibre reinforced concrete (PFRC) as an alternative for reducing or even eliminating the reinforcing steel bars employed in reinforced concrete has become real in the past years. This contribution analyses the improvements in sustainability that a change in the aforementioned reinforcement configuration might provide in a flyover bridge. Economic, environmental and social parameters of both possibilities were studied by means of the integrated value model for sustainable assessment use (Modelo Integrado de Valor para una Evaluación Sostenible, MIVES) used in Spain, which is a multi-criteria decision-making method based on the value function concept and the seminars delivered by experts. The results of the MIVES method showed that the use of PFRC in combination with reinforced concrete (RC) has a sustainability index 22% higher. An analysis of the parameters that form this evaluation shows that there are no remarkable differences in the financial costs between the two possibilities studied. Nevertheless, social and environmental aspects provide with a better qualification the option of building a bridge by using PFRC combined with RC.

scholarly journals Use of Steel and Polyolefin Fibres in the La Canda Tunnels: Applying MIVES for Assessing Sustainability Evaluation

2018 ◽  
Author(s):  
Marcos G. Alberti ◽  
Jaime C. Gálvez ◽  
Alejandro Enfedaque ◽  
Ana Carmona ◽  
Cristina Valverde ◽  
...  
Keyword(s):  
Value Function ◽  
Raw Materials ◽  
High Energy ◽  
Point Of View ◽  
Concrete Slabs ◽  
Function Concept ◽  
Sustainability Evaluation ◽  
Value Model ◽  
The Value Function ◽  
High Energy Consumption

Construction involves the use of significant quantities of raw materials and entails high-energy consumption. For the sake of choosing the most appropriate solution that considers environmental and sustainable concepts, tools such as the integrated value model for sustainable assessment (Modelo Integrado de Valor para una Evaluación Sostenible, MIVES) used in Spain, plays a key role in obtaining the best solution. MIVES is a multi-criteria decision-making method based on the value function concept and the seminars delivered by experts. Such tools, in order to show how they may work, require application to case studies. In this paper, two concrete slabs manufactured with differing reinforcement during the construction of the La Canda Tunnels are compared by means of MIVES. The two concrete slabs were reinforced with a conventional steel-mesh and with polyolefin fibres. The results showed that from the point of view of sustainability, the use of polyolefin fibres provided a significant advantage mainly due to the lower maintenance required.

scholarly journals Use of Steel and Polyolefin Fibres in the La Canda Tunnels: Applying MIVES for Assessing Sustainability Evaluation

2018 ◽  
Vol 10 (12) ◽  
pp. 4765 ◽  
Author(s):  
Marcos G. Alberti ◽  
Jaime C. Gálvez ◽  
Alejandro Enfedaque ◽  
Ana Carmona ◽  
Cristina Valverde ◽  
...  
Keyword(s):  
Value Function ◽  
Raw Materials ◽  
High Energy ◽  
Point Of View ◽  
Concrete Slabs ◽  
Function Concept ◽  
Sustainability Evaluation ◽  
Value Model ◽  
The Value Function ◽  
High Energy Consumption

Construction involves the use of significant quantities of raw materials and entails high-energy consumption. For the sake of choosing the most appropriate solution that considers environmental and sustainable concepts, tools such as the integrated value model for sustainable assessment (Modelo Integrado de Valor para una Evaluación Sostenible, MIVES) used in Spain, plays a key role in obtaining the best solution. MIVES is a multi-criteria decision-making method based on the value function concept and the seminars delivered by experts. Such tools, in order to show how they may work, require application to case studies. In this paper, two concrete slabs manufactured with differing reinforcements during the construction of the La Canda Tunnels are compared by means of MIVES. The two concrete slabs were reinforced with a conventional steel-mesh and with polyolefin fibres. This research was focussed on the main aspects affecting the construction. That is to say, the environmental, economic, and social factors were assessed by the method, being of special impact the issues related with maintenance of the structure. The results showed that from the point of view of sustainability, the use of polyolefin fibres provided a significant advantage, mainly due to the lower maintenance required.

scholarly journals Recent advances in structural fibre-reinforced concrete focused on polyolefin-based macro-synthetic fibres

2020 ◽  
Vol 70 (337) ◽  
pp. 206 ◽  
Author(s):  
M. G. Alberti ◽  
A. Enfedaque ◽  
J. C. Gálvez ◽  
A. Picazo
Keyword(s):  
Reinforced Concrete ◽  
Reinforce Concrete ◽  
Tensile Tests ◽  
Environmental Benefits ◽  
Fibre Reinforced Concrete ◽  
Steel Fibres ◽  
Lower Weight ◽  
Steel Bars ◽  
Future Challenges ◽  
And Storage

Fibre-reinforced concrete (FRC) allows reduction in, or substitution of, steel-bars to reinforce concrete and led to the commonly named structural FRC, with steel fibres being the most widespread. Macro-polymer fibres are an alternative to steel fibres, being the main benefits: chemical stability and lower weight for analogous residual strengths of polyolefin-fibre-reinforced concrete (PFRC). Furthermore, polyolefin fibres offer additional advantages such as safe-handling, low pump-wear, light weight in transport and storage, and an absence of corrosion. Other studies have also revealed environmental benefits. After 30 years of research and practice, there remains a need to review the opportunities that such a type of fibre may provide for structural FRC. This study seeks to show the advances and future challenges of use of these polyolefin fibres and summarise the main properties obtained in both fresh and hardened states of PFRC, focussing on the residual strengths obtained from flexural tensile tests.

scholarly journals Steel Fibre Reinforced Light weight Aggregate Concrete

2020 ◽  
Vol 9 (1) ◽  
pp. 1962-1965
Keyword(s):  
Reinforced Concrete ◽  
Steel Fibre ◽  
Waste Materials ◽  
Light Weight ◽  
Fibre Reinforced Concrete ◽  
Underground Structures ◽  
Environmental Aspect ◽  
Steel Fibre Reinforced Concrete ◽  
The Past ◽  
Light Weight Aggregate

Paper From the past studies on Steel fibre reinforced concrete, it has been established that the performance of concrete can be enhanced by incorporating fibres from waste materials from the commercial benefit and environmental aspect.. Reinforcing concrete with steel fibres (SFRC) increases the tensile strength of concrete thereby improving its brittle behaviour.The major applications of SFRC being in tunnel lining,underground structures,flooring. The analysis presented states that the light weight concrete when incorporated with the waste steel from reinforcement and formworks with different fibre contents yield the comparable outcomes as the already studied fibre reinforced concrete

scholarly journals Modern concrete pipes: a review of reinforcement and new technologies

2021 ◽  
Vol 43 (s1) ◽  
pp. 548-557
Author(s):  
Tomasz Abel ◽  
Natalia Pelczar
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Service Life ◽  
New Technologies ◽  
Attractive Alternative ◽  
Fibre Reinforced Concrete ◽  
Concrete Pipes ◽  
Steel Bars ◽  
Biological Corrosion ◽  
Sewage Systems

Abstract The paper discusses existing reinforcement, future reinforcement and new technologies for concrete pipes used in the sewage systems. Concrete pipes currently in use and under investigation are reviewed. Structural fibres, as the main reinforcement of concrete pipes, are known as an attractive alternative to the traditional steel bars. Steel, synthetic and basalt fibres have been considered. The latest research and mechanical properties of individual fibres are presented. Advances in fibre-reinforced concrete provide a new basis for the design of more efficient concrete pipes, especially those resistant to biological corrosion and with a longer service life. In the article, future non-corrosive reinforcement due to the reduction of steel reinforcement and corrosion protection linings has been proposed.

scholarly journals On Polynomial Sized MDP Succinct Policies

2004 ◽  
Vol 21 ◽  
pp. 551-577 ◽  
Author(s):  
P. Liberatore
Keyword(s):  
Markov Decision Processes ◽  
Value Function ◽  
Decision Processes ◽  
Polynomial Hierarchy ◽  
The Past ◽  
Current State ◽  
A Value ◽  
Markov Decision ◽  
The Value Function

Policies of Markov Decision Processes (MDPs) determine the next action to execute from the current state and, possibly, the history (the past states). When the number of states is large, succinct representations are often used to compactly represent both the MDPs and the policies in a reduced amount of space. In this paper, some problems related to the size of succinctly represented policies are analyzed. Namely, it is shown that some MDPs have policies that can only be represented in space super-polynomial in the size of the MDP, unless the polynomial hierarchy collapses. This fact motivates the study of the problem of deciding whether a given MDP has a policy of a given size and reward. Since some algorithms for MDPs work by finding a succinct representation of the value function, the problem of deciding the existence of a succinct representation of a value function of a given size and reward is also considered.

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