Effect of binders and hemp fibre in concrete

2021 ◽  
Author(s):  
F. Stella mary ◽  
G. Nithambigai ◽  
P.M. Rameshwaran
Keyword(s):  
Hemp Fibre

Effect of fibre content on the mechanical properties of hemp fibre woven fabrics/polypropylene composite laminates

2021 ◽  
pp. 096739112110239
Author(s):  
Sheedev Antony ◽  
Abel Cherouat ◽  
Guillaume Montay
Keyword(s):  
Mechanical Properties ◽  
Polymer Matrix ◽  
Composite Laminates ◽  
Volume Fraction ◽  
Fibre Volume Fraction ◽  
Fibre Volume ◽  
Woven Fabrics ◽  
Fibre Content ◽  
Viscoelastic Behaviour ◽  
Hemp Fibre

Nowadays natural fibre composites have gained great significance as reinforcements in polymer matrix composites. Composite material based on a polymer matrix reinforced with natural fibres is extensively used in industry due to their biodegradability, recyclability, low density and high specific properties. A study has been carried out here to investigate the fibre volume fraction effect of hemp fibre woven fabrics/PolyPropylene (PP) composite laminates on the tensile properties and impact hammer impact test. Initially, composite sheets were fabricated by the thermal-compression process with desired number of fabric layers to obtain composite laminates with different fibre volume fraction. Uniaxial, shear and biaxial tensile tests were performed and mechanical properties were calculated. Impact hammer test was also carried out to estimate the frequency and damping parameters of stratified composite plates. Scanning Electron Microscope (SEM) analysis was performed to observe the matrix and fibre constituent defects. Hemp fabrics/PP composite laminates exhibits viscoelastic behaviour and as the fibre volume fraction increases, the viscoelastic behaviour decreases to elastic behaviour. Due to this, the tensile strength increases as the fibre content increases. On the other hand, the natural frequency increases and damping ratio decrease as the fibre volume fraction increases.

Characteristics of hemp fibre reinforced foam concretes with fly ash and Taguchi optimization

2021 ◽  
Vol 294 ◽  
pp. 123607
Author(s):  
Osman Gencel ◽  
Oguzhan Yavuz Bayraktar ◽  
Gokhan Kaplan ◽  
Ahmet Benli ◽  
Gonzalo Martínez-Barrera ◽  
...  
Keyword(s):  
Fly Ash ◽  
Taguchi Optimization ◽  
Hemp Fibre

Environmental Effects on the Static and Fatigue Behaviours of Hemp Fibre under Tensile Loading

2015 ◽  
Vol 798 ◽  
pp. 410-418
Author(s):  
Anh Dung Ngo ◽  
Thu Nga Ho ◽  
Khalid Sefrioui Manar
Keyword(s):  
Mechanical Properties ◽  
Moisture Content ◽  
Failure Modes ◽  
Harmful Effect ◽  
Tensile Loading ◽  
Ambient Air ◽  
Absorption Mechanism ◽  
Hemp Fibre ◽  
Temperature And Humidity ◽  
Static Tensile

Environmental and loading mode effects on the tensile properties of Hemp fibre were investigated. At first, absorption of moisture into the fibre from ambient air and absorption of water into the fibre in immersion were studied. Then static and cyclic loadings tensile tests were conducted in various temperature and humidity conditions. It was found that, in ambient air (0% < RH < 80%) the moisture content of the studied fibre decreased with the increase of temperature conformed to the GAB model suggesting a multilayer absorption mechanism. On the contrary, for the fibre immersed in water, the moisture content increased with the increase of temperature. The activation of temperature on the diffusion of the water into the fibre by micro-pores and lumens jointly with the lack of possibility for the imprisoned water to evaporate might be the cause of this effect. Experimental results suggested that temperature and humidity could individually reduce the mechanical properties of Hemp fibre. Their interaction caused even a more harmful effect. Semi empirical and neural networks were used to predict the hygro-thermal effects on the mechanical properties under static tensile loading. Broken surfaces of the specimens were also examined showing different failure modes for static and cyclic tensile loadings. Finally, the value of the cellulose micro-fibrils angle (MFA) estimated using the static tensile stress-strain curve was 8.4o±1.9o.

scholarly journals Characteristic and Performance of Elementary Hemp Fibre

2010 ◽  
Vol 01 (06) ◽  
pp. 336-342 ◽  
Author(s):  
Dasong Dai ◽  
Mizi Fan
Keyword(s):  
Hemp Fibre ◽  
And Performance

The Development of Hemp Fibre Nonwovens

2015 ◽  
Vol 1117 ◽  
pp. 227-230
Author(s):  
Uljana Iljina ◽  
Ilze Baltina ◽  
Stephen Russell
Keyword(s):  
Surface Modification ◽  
Electrical Properties ◽  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Research Work ◽  
Oxide Nanoparticles ◽  
Hemp Fibre ◽  
Hemp Fibres

Hemp fibre nonwovens are developed in the research work with a goal to the materials surface modification applying metal and metal oxide nanoparticles. It is planned to investigate the electrical properties of nonwovens to determine their ability to serve as radiation insulation. Fibres cut into 5 cm long, some of them passed through Laroche Cadette equipment twice that opens the fibres and part manually combed before making nonwovens. Carded webs formed from prepared fibres by parallel-laid carding method. The fibres opened by using Laroche Cadette equipment formed web only by mixing hemp fibres with 15% Tencel fibres. Clean hemp fibres webs created from manually combed fibres. Hemp fibres nonwovens created by using hydroentanglement method.

Hemp Fibre Reinforced Composites

2017 ◽  
Author(s):  
Ivana Schwarzova ◽  
Nadezda Stevulova ◽  
Tomas Melichar
Keyword(s):  
Physical And Mechanical Properties ◽  
High Strength ◽  
Sustainable Construction ◽  
Component Part ◽  
Reinforced Composites ◽  
Hemp Fibre ◽  
And Performance ◽  
Water Absorbability ◽  
Industrial Hemp ◽  
Fibre Reinforced Composites

The conventional homogeneous materials can no longer effectively satisfy the growing demands on product capabilities and performance, due to the advancement in products design and materials engineering. Therefore, the fibre reinforced composites with better properties and desirable applications emerged. Natural fibres have high strength to low weight ratios and have good sound and thermal insulation properties. Combination of organic filler and inorganic matrix creates high-quality products such as fibre boards and composites. The great importance is attached to industrial hemp as source of the rapidly renewable fibres and as non-waste material. Industrial hemp fibre has great potential in composite materials reinforcement. However, improving interfacial bonding between fibres and matrix is an important factor for its using in composites. This paper deals with hemp fibre reinforced composites in civil engineering as component part of sustainable construction. Prepared lightweight composites based on original and pre-treated hemp hurds are characterized by selected physical and mechanical properties (density, thermal conductivity, water absorbability, compressive and tensile strength) in dependence on used inorganic binder (traditional Portland cement and alternative MgO-cement).

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