The glass fibre/polymer interface. 1 — Theoretical considerations for single fibre pullout tests

Composites ◽  
1985 ◽  
Vol 16 (4) ◽  
pp. 339
Keyword(s):  
Glass Fibre ◽  
Single Fibre ◽  
Polymer Interface ◽  
Pullout Tests ◽  
Fibre Pullout ◽  
Theoretical Considerations

Single fibre pullout tests on auxetic polymeric fibres

2005 ◽  
Vol 40 (16) ◽  
pp. 4355-4364 ◽  
Author(s):  
V. R. Simkins ◽  
A. Alderson ◽  
P. J. Davies ◽  
K. L. Alderson
Keyword(s):  
Single Fibre ◽  
Pullout Tests ◽  
Fibre Pullout

scholarly journals Effect of Using Hybrid Polypropylene and Glass Fibre on the Mechanical Properties and Permeability of Concrete

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3786 ◽  
Author(s):  
Abubaker A. M. Ahmed ◽  
Yanmin Jia
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Glass Fibre ◽  
Single Fibre ◽  
Air Permeability ◽  
Fibre Content ◽  
Peak Performance ◽  
Fibre Reinforced Concrete ◽  
Performance Limit ◽  
Hybrid Fibre

A comprehensive program of experiments consisting of compression, uniaxial compression, direct shear, flexural as well as splitting tensile and air permeability tests were performed to analyse the effect of the level of fibre dosage and the water–cement ratio on the physical properties of hybrid fibre-reinforced concrete (HFRC). Two types of fibres were studied in terms of their effect on the properties of HFRC. The results indicated that the mechanical properties of concrete were significantly improved by increasing the fibre content. However, increasing the percentage fibre content past a certain peak performance limit (0.9% glass fibre (GF) and 0.45% polypropylene fibre (PPF)) led to a decrease in strength compared to reference mixes. Additionally, the incorporation of hybrid fibres yielded an increase in air permeability in the tested specimens. The results showed that the strength-related properties of HFRC were superior to the properties of single fibre-reinforced concrete.

Mechanical Behaviour of Cement Concrete using Fibres

2018 ◽  
Vol 6 (04) ◽  
Author(s):  
Gaurav Vats ◽  
Preeti Kuhar ◽  
Sanjeev Kumar
Keyword(s):  
Glass Fibre ◽  
Steel Fibre ◽  
Weight Fraction ◽  
Single Fibre ◽  
Polyamide Fibre ◽  
Mix Design ◽  
Modern Time ◽  
Cement Concrete ◽  
Fibre Glass ◽  
Concrete Matrix

Concrete is the most used material for the construction in the modern time of infrastructures. Concrete is strong in compression but it is weak in tension and shear. To minimise those problems, fibres were introduced in concrete to enhance its tensile strength and shear strength. In my present investigation, the mechanical properties of fibres reinforced concrete are studied by using steel fibre, glass fibre and polyamide fibre with a different weight fraction of fibres with respect to cement. The mix design of M25 concrete with W/C ratio of 0.42 is prepared and total thirteen mixes included one control mix was prepared and tested in the laboratory. The total quantity of fibres mixed in the concrete are in order of 0%, 0.75%, 1.5%, and 2.25% by weight of cement and one mix contains 0.33% of glass fibre, 0.33% of steel fibre and 0.33% of polyamide. The study shows that the mixed fibres provide better properties in controlling cracks and high strengths than single fibre and concrete without fibre. On increasing the percentage of fibres beyond 1.5%, the strength of the concrete matrix decrease due to mat form of fibres or non-uniform distribution of fibres and also decrease due to non-cohesiveness of the concrete particle to each other.

scholarly journals INVESTIGATION OF STEEL FIBRE PULLOUT AND MODELING OF BRIDGING BEHAVIOUR IN SFRC

2012 ◽  
Vol 4 (3) ◽  
pp. 77-88
Author(s):  
Ulvis Skadins ◽  
Janis Brauns
Keyword(s):  
Numerical Model ◽  
Fibre Type ◽  
Fracture Process ◽  
Steel Fibre ◽  
Test Results ◽  
Average Force ◽  
Pullout Tests ◽  
Fibre Pullout ◽  
Concrete Mix ◽  
Pullout Behaviour

By adding fibres to concrete mix the objective is to bridge discrete cracks providing for some control to the fracture process and increase the fracture energy. Fibres become active mainly when cracking starts and deformation of the fibre occurs. Pullout tests with four types of fibres with different orientation, embedment lengths, and concrete strengths are performed to simulate the bridging process. Fibre pullout behaviour is analysed for relatively small slippage displacement to keep it close to real designing situations. The test results show significant effect of fibre type on pullout behaviour, nevertheless the effect is intangible on fibres inclined at 30 degrees or more. An effective displacement is introduced, derived from experimental force-slip curves, when fibre becomes involved in bridging. Based on the effective displacement and simplified average force-slip curves a numerical model is proposed to analyse the tensile stresses transferred by fibres crossing a crack.

scholarly journals Micromechanical Tests on Natural Fibre Composites with Enzymatically Enhanced Fibre–Matrix Adhesion

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Hanna M. Brodowsky ◽  
Anne Hennig
Keyword(s):  
Shear Strength ◽  
Single Fibre ◽  
Natural Fibre ◽  
Interfacial Shear ◽  
Frictional Stress ◽  
Reinforced Composites ◽  
Fragmentation Test ◽  
Fibre Pullout ◽  
Fibre Matrix ◽  
Fibre Reinforced Composites

Abstract Natural fibre–reinforced composites are more sustainable than other composites with respect to the raw materials. Their properties are attractive due to high specific properties, and especially so wherever high damping is valued. As the interphase between fibre and matrix is the region of highest stresses, a strong bond between fibre and matrix is essential for any composites’ properties. The present study compares two methods of determining the interfacial shear stress in natural fibre–reinforced composites: the single fibre fragmentation test and the single fibre pullout test. The studied composites are flax fibre reinforced epoxy. For a variety of fibre–matrix interaction, the fibres are treated with a laccase enzyme and dopamine, which is known to improve the fibre–matrix shear strength. In the observed samples, single fibre fragmentation test data, i.e. of fracture mode and fragment length, scatter when compared to pullout data. In single fibre pullout tests, the local interfacial shear strength showed a 30% increase in the laccase-treated samples, compared to the control samples. The method also permitted an evaluation of the frictional stress occurring after surface failure.

Sign in / Sign up

Export Citation Format

Share Document