The impact of RCA and fly ash on the mechanical and durability properties of polypropylene fibre-reinforced concrete exposed to freeze-thaw cycles and MgSO4 with ANN modeling

2021 ◽  
Vol 313 ◽  
pp. 125508
Author(s):  
Oguzhan Yavuz Bayraktar ◽  
Samı Salem Taher Eshtewı ◽  
Ahmet Benli ◽  
Gokhan Kaplan ◽  
Kenan Toklu ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Fly Ash ◽  
Polypropylene Fibre ◽  
Fibre Reinforced Concrete ◽  
Freeze Thaw ◽  
Ann Modeling ◽  
Durability Properties ◽  
The Impact

scholarly journals PROPERTIES OF FRESH POLYPROPYLENE FIBRE REINFORCED CONCRETE UNDER THE INFLUENCE OF POZZOLANS

2003 ◽  
Vol 9 (4) ◽  
pp. 271-279 ◽  
Author(s):  
Hau-yan Leung ◽  
Ramapillai V. Balendran
Keyword(s):  
Reinforced Concrete ◽  
Fly Ash ◽  
Silica Fume ◽  
Setting Time ◽  
Polypropylene Fibre ◽  
Partial Replacement ◽  
Fibre Reinforced Concrete ◽  
Polypropylene Fibres ◽  
Fibre Concrete ◽  
Time Substitution

This paper summarises experimental results of some fresh concrete tests. Polypropylene fibres were added to the concrete mix to produce fibre reinforced concrete. Pozzolanic materials, including pulverised fly ash and silica fume, were used as partial replacement of cement, and their effects on the fresh fibre concrete were reported. Test results showed that the polypropylene fibre reduced the concrete workability significantly by thixotropic effect and decreased the setting time. Substitution of pozzolans also greatly affected the properties. The presence of fly ash increased the workability and setting time but in the presence of silica fume a reverse trend was observed. Empirical equations were proposed.

scholarly journals Assessment of Concrete Mixes Replaced with Fly Ash and Reinforced with Steel and Polypropelene Fibres

2019 ◽  
Vol 8 (4S2) ◽  
pp. 92-96
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Fly Ash ◽  
Steel Fibre ◽  
Plain Concrete ◽  
Polypropylene Fibre ◽  
Structural Behavior ◽  
Experimental Program ◽  
Fibre Reinforced Concrete ◽  
Polypropylene Fibres

This paper presents a series of tests for characterizing the structural behavior of fibre reinforced concrete subjected to different loading. The experimental program involves investigation of fly ash replaced concrete with two types of fibres i.e. Steel fibre and polypropylene fibre. Plain concrete and conventionally fly ash replaced reinforced concrete specimens have also been casted and tested in the laboratory. The mechanical properties of Conventional M30 grade of concrete and concrete with cement replaced by fly ash and reinforced with steel and polypropylene fibres of three volume fractions of 0.2 % to 1.4 % are studied. This research is to study about the mechanical properties of fly ash with steel and polypropylene as a strengthening material

scholarly journals RESONANT FREQUENCY IN POLYPROPYLENE FIBRE REINFORCED CONCRETE (PFRC) WITH POZZOLANIC MATERIALS

2002 ◽  
Vol 8 (3) ◽  
pp. 169-176
Author(s):  
Hau Y. Leung ◽  
Ramapillai V. Balendran
Keyword(s):  
Reinforced Concrete ◽  
Fly Ash ◽  
Resonant Frequency ◽  
Silica Fume ◽  
Polypropylene Fibre ◽  
Partial Replacement ◽  
Fibre Reinforced Concrete ◽  
Polypropylene Fibres ◽  
Curing Conditions ◽  
Curing Condition

In this study, the resonant frequency of polypropylene fibre reinforced concrete (PFRC) under three different curing conditions was investigated and the influences of fly ash (PFA) and silica fume (SF) on PFRC under the same curing condition were also studied. The experiments were carried out in the Heavy Laboratory of City University of Hong Kong. Four types of concrete mixes were tested. A total of 24 concrete specimens were prepared. Test results show that the resonant frequency can be affected by the presence of polypropylene fibres, partial replacement of cement by silica fume or pulverized fly ash, and curing condition.

scholarly journals Chloride Diffusion Property of Hybrid Basalt–Polypropylene Fibre-Reinforced Concrete in a Chloride–Sulphate Composite Environment under Drying–Wetting Cycles

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1138
Author(s):  
Yang Luo ◽  
Ditao Niu ◽  
Li Su
Keyword(s):  
Reinforced Concrete ◽  
Coupling Effect ◽  
Early Stage ◽  
Polypropylene Fibre ◽  
Chloride Diffusion ◽  
Fibre Reinforcement ◽  
Fibre Reinforced Concrete ◽  
Basalt Fibre ◽  
Diffusion Property ◽  
Chloride Attack

The effect of fibre reinforcement on the chloride diffusion property of concrete is controversial, and the coupling effect of sulphate erosion and drying–wetting cycles in marine environments has been neglected in previous studies. In this study, the chloride diffusion property of hybrid basalt–polypropylene fibre-reinforced concrete subjected to a combined chloride–sulphate solution under drying–wetting cycles was investigated. The effects of basalt fibre (BF), polypropylene fibre (PF), and hybrid BP–PF on the chloride diffusion property were analysed. The results indicate that the presence of sulphate inhibits the diffusion of chloride at the early stage of erosion. However, at the late stage of erosion, sulphate does not only accelerate the diffusion of chloride by causing cracking of the concrete matrix but also leads to a decrease in the alkalinity of the pore solution, which further increases the risk of corrosion of the reinforcing steel. An appropriate amount of fibre can improve the chloride attack resistance of concrete at the early stage. With the increase in erosion time, the fibre effectively prevents the formation and development of sulphate erosion microcracks, thus reducing the adverse effects of sulphate on the resistance of concrete to chloride attack. The effects of sulphate and fibre on the chloride diffusion property were also elucidated in terms of changes in corrosion products, theoretical porosity, and the fibre-matrix interface transition zone.

Polypropylene Fibre Reinforced Concrete Air Permeability

1990 ◽  
Vol 211 ◽  
Author(s):  
Miguel A. Sanjuan ◽  
A. Moragues ◽  
B. Bacle ◽  
C. Andrade
Keyword(s):  
Carbon Dioxide ◽  
Reinforced Concrete ◽  
Steel Corrosion ◽  
Air Permeability ◽  
Polypropylene Fibre ◽  
Fibre Reinforced Concrete ◽  
Polypropylene Fibres ◽  
Cement Ratio ◽  
Reinforcing Steel Corrosion

AbstractThe permeability of concrete to gases is of direct importance to the durability of concrete structures, because of carbon dioxide flowing through the concrete favour lime carbonation and reinforcing steel corrosion.Mortar with and without polypropylene fibres having water/cementitious ratios of 0.30, 0.35 and 0.40 and a cement/sand ratio of 1/1 were studied. Polypropylene dosage varied from 0.1 to 0.3% by volume of cement.The characterization of mortar permeability was made using cylindrical shaped samples (3 cm height and 15 cm diameter). These specimens were 28 days cured and then dried before the test.The addition of fibres results in a decrease of air permeability. Variation of the water/cement ratio is of lesser importance than fiber addition.

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