Bonding in Cementitious Composites: How Important is it?

1987 ◽  
Vol 114 ◽  
Author(s):  
Sidney Mindess
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Mechanical Behaviour ◽  
Secondary Effect ◽  
Hydrated Cement ◽  
Fibre Reinforced Concrete ◽  
Reinforcing Bars ◽  
Interfacial Bond ◽  
Hydrated Cement Paste ◽  
Different Types

ABSTRACTA number of different types of interfacial bonding occur in concrete, including:i) bonding between various phases (including anhydrous cement) in the hydrated cement paste (hcp) systemii) bonding between cement and aggregatesiii) bonding between cement or mortar and the fibres in fibre-reinforced concrete; andiv) bonding between concrete and steel reinforcing bars or prestressing cables.The importance of these types of bonds with respect to the mechanical behaviour of concrete is discussed. It is concluded that in some systems, the mechanical properties are governed primarily by the interfacial bond; in other systems, however, this bond has only a secondary effect.

scholarly journals Comparison of Mechanical Properties of Normal and Fibre Reinforced Concrete (Grade M15)

2019 ◽  
Vol 5 ◽  
pp. 153-164
Author(s):  
Sagar Bista ◽  
Sagar Airee ◽  
Shikshya Dhital ◽  
Srijan Poudel ◽  
Sujan Neupane
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Steel Fibre ◽  
Residential Buildings ◽  
Fibre Reinforced Concrete ◽  
Cement Concrete ◽  
Normal Concrete ◽  
Steel Fibre Reinforced Concrete ◽  
Cracking Control ◽  
Different Types

Concrete is weak in tension, hence some measures must be adopted to overcome this deficiency as well as to enhance physical and other mechanical properties but in more convenient and economical method. Through many research from the past, it has been observed that addition of different types of fibres has been more effective for this purpose. This report presents the work undertaken to study the effect of steel and hay fibre on normal cement concrete of M-15 Grade on the basis of its mechanical properties which include compressive and tensile strength test and slump test as well. Although hay fibres are abundantly available in Nepal, no research have been popularly conducted here regarding the use of hay fibres in concrete and the changes brought by it on concrete’s mechanical properties. Experiments were conducted on concrete cubes and cylinders of standard sizes with addition of various percentages of steel and hay fibres i.e. 0.5%, 1% and 1.5% by weight of cement and results were compared with those of normal cement concrete of M-15 Grade. For each percentage of steel and hay fibre added in concrete, six cubes and six cylinders were tested for their respective mechanical properties at curing periods of 14 and 28 days. The results obtained show us that the optimum content of fibre to be added to M-15 grade of concrete is 0.5% steel fibre for compression and 0.5% hay fibre content for tension by weight of cement. Also, addition of steel and hay fibres enhanced the binding properties, micro cracking control and imparted ductility. In addition to this, two residential buildings were modeled in SAP software, one with normal concrete and other with concrete containing 0.5% steel fibre. Difference in reinforcement requirements in each building was computed from SAP analysis and it was found that 489.736 Kg of reinforcement could be substituted by 158.036 kg of steel fibres and decrease in materials cost of building with 0.5% steel fibre reinforced concrete was found to be Rs. 32,100.

scholarly journals Functionally Graded Concrete Using Glass Fiber and Flyash

2019 ◽  
pp. 446-450
Author(s):  
Sureshkumar M.P. ◽  
Naveenkumar V ◽  
Thangaprakash R ◽  
Gokul S ◽  
Gunasekaran M.A
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Glass Fiber ◽  
Fibrous Material ◽  
Structural Integrity ◽  
Basalt Fiber ◽  
Functionally Graded ◽  
Fiber Reinforced Concrete ◽  
Fibre Reinforced Concrete ◽  
Different Types

It has been found that different type of fibers added in specific percentage to concrete improves the mechanical properties, durability and serviceability of the structure. Fiber-reinforced concrete (FRC) is concrete containing fibrous material which increases its structural integrity. It contains short discrete fibers that are uniformly distributed and randomly oriented. Different types of Fibre reinforced concrete includes steel fibres, glass fibres, synthetic fibres and natural fibres Basalt fiber is a material made from extremely fine fibers of basalt, which is composed of the minerals plagioclase, pyroxene, and olivine.  

scholarly journals Behaviour of UHPFRCs in compression under high stress-rates

2018 ◽  
Vol 183 ◽  
pp. 02005
Author(s):  
Ezio Cadoni ◽  
Matteo Dotta ◽  
Daniele Forni
Keyword(s):  
Reinforced Concrete ◽  
Mechanical Behaviour ◽  
High Performance ◽  
High Stress ◽  
Slight Reduction ◽  
Fibre Reinforcement ◽  
Fibre Reinforced Concrete ◽  
Dynamic Event ◽  
The Matrix ◽  
High Performance Fibre

The paper presents the results obtained on cylindrical Ultra High Performance Fibre Reinforced Concrete specimens with diameter of 30mm and a height of 60mm under compression at high stress rate (1.7–2.3 TPa/s). Four different percentages of fibre reinforcement are considered (1, 2, 3, and 4% fibre content) and compared with the results of the matrix (UHPC). A slight reduction of the strength and fracture time with the introduction of fibres is observed. The experimental results are analysed and discussed with the intent to better understand the mechanical behaviour of UHPFRC materials in case of dynamic event under service loading conditions.

Experiment Study on Mechanics and Pore Structure of Steel Fibre Reinforced Concrete

2010 ◽  
Vol 150-151 ◽  
pp. 825-828
Author(s):  
Yan Wang ◽  
Di Tao Niu ◽  
Yuan Yao Miao ◽  
Nai Qi Jiao
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Reinforced Concrete ◽  
Pore Structure ◽  
Steel Fibre ◽  
Fibre Reinforced Concrete ◽  
Experiment Study ◽  
Steel Fibre Reinforced Concrete ◽  
Mercury Intrusion ◽  
Strength And Durability

The concrete microstructure can affect its macroscopic properties, such as the strength and durability, etc. Based on the experimental study of cube compressive strength of steel fibre reinforced concrete, splitting tensile strength, flexural strength, and using by mercury intrusion method to test the pore structure of steel fibrous, this paper analyzes the influence of fibre on concrete pore structure. And then on mechanical properties of concrete from microcosmic perspective.

Dynamic compressive mechanical behaviour and modelling of basalt–polypropylene fibre-reinforced concrete

2018 ◽  
Vol 18 (3) ◽  
pp. 914-927 ◽  
Author(s):  
Qiang Fu ◽  
Ditao Niu ◽  
Jian Zhang ◽  
Daguan Huang ◽  
Yan Wang ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Mechanical Behaviour ◽  
Polypropylene Fibre ◽  
Fibre Reinforced Concrete

scholarly journals Numerical Simulation of the Fracture Behaviour of High-Performance Fibre Reinforced Concrete by Using a Cohesive-Crack-Based Inverse Analysis

2021 ◽  
Author(s):  
Alejandro Enfedaque ◽  
Marcos G. Alberti ◽  
Jaime C. Gálvez ◽  
Pedro Cabanas
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Inverse Analysis ◽  
High Performance ◽  
Fracture Behaviour ◽  
Constitutive Models ◽  
Cohesive Crack ◽  
Fibre Reinforced Concrete ◽  
Steel Fibres ◽  
Structural Applications

Fibre reinforced concrete (FRC) has become an alternative for structural applications due its outstanding mechanical properties. The appearance of new types of fibres and the fibre cocktails that can be configured mixing them has created FRC that clearly exceed the minimum mechanical properties required in the standards. Consequently, in order to take full advantage of the contribution of the fibres in construction projects, it is of great interest to have constitutive models that simulate the behaviour of the materials. This study aimed to simulate the fracture behaviour of five types of FRC, three with steel hooked fibres, one with a combination of two types of steel fibres and one with a combination of polyolefin fibres and two types of steel fibres, by means of an inverse analysis based on the cohesive crack approach. The results of the numerical simulations defined the softening functions of each FRC formulation and have pointed out the synergies that are created through use of fibre cocktails. The information obtained might suppose a remarkable advance for designers using high-performance FRC in structural elements.

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