Flexural Strength Improvement using Human Hair Fibre (HHF) in Reinforced Concrete

FRC (Fibre Reinforced Concrete) is fibrous material which increases its structural integrity, resists to explosive spalling in case of environmental affects, improves mix cohesion, improves ductility, reduces of steel reinforcement requirements and reduces the voids due to good stiffness. It contains short discrete fibres that are uniformly distributed. Mostly, natural fibers are the waste material which may have negative impact on environment. Synthetic fibres include steel fibres and glass fibres but natural fibres are coconut fibres and human hair fibres which tends to vary the properties to concrete. In addition, the character of FRC changes with varying concrete, fibre material, geometries, distribution, orientation and densities. Hair fibre concrete gives a practical, cost-effective and convenient method to avoid cracks and deficiencies regarding strength and proper mixing ratio which occurs at a longer period. Fibres have been used to reduce plastic shrinkage and drying shrinkage in concrete. In some structural elements, fibrous concrete can be used to reduce the cost of structure. Different fibres are used to improve the tensile strength of concrete. Human hair are strong in tension. Hair fibres can be utilized as a strengthening material. Hair fibre is a non-decay able matter and available at a cheap rate. Experiments have been performed on fibrous concrete cylinders containing various percentages of human hair which is 0, 0.5, 1 and 1.5% by the weight of cement. A total of seventy-two cylinders have been prepared with FRC having different %ages of hair content. Workability, compressive strength and split tensile strength have been checked at three curing ages i.e. 7, 14 and 28 days. This research will open a new wicket in the horizon of reuse of waste material efficiently in construction industry. This innovation in construction industry will save our natural resources and use fibre in productive and an effective approach.

Download Full-text

Comparative Study of Shear and Flexural Strength for Various Parameters on Hardened High Strength Fibre Reinforced Concrete Beam (HSFRC) for M70 and M80 Grade

SSRN Electronic Journal ◽

10.2139/ssrn.3430048 ◽

2019 ◽

Author(s):

Rakhi Nimbhore ◽

Rahul Pandit ◽

Abhijeet Wadekar

Keyword(s):

Reinforced Concrete ◽

Flexural Strength ◽

Comparative Study ◽

Concrete Beam ◽

High Strength ◽

Reinforced Concrete Beam ◽

Fibre Reinforced Concrete

Download Full-text

Simultaneous effects of rice husk silica and silicon carbide whiskers on the mechanical properties and morphology of sodium geopolymer

Journal of Composite Materials ◽

10.1177/0021998320928579 ◽

2020 ◽

Vol 54 (29) ◽

pp. 4611-4620 ◽

Cited By ~ 2

Author(s):

Akm Samsur Rahman ◽

Chirag Shah ◽

Nikhil Gupta

Keyword(s):

Silicon Carbide ◽

Compressive Strength ◽

Flexural Strength ◽

Silica Nanoparticles ◽

Rice Husk ◽

Silicon Carbide Whiskers ◽

Short Beam ◽

Spherical Silica ◽

Beam Shear ◽

Strength Improvement

The current research is focused on developing a geopolymer binder using rice husk ash–derived silica nanoparticles. Four types of rice husks were collected directly from various rice fields of Bangladesh in order to evaluate the pozzolanic activity and compatibility of the derived rice husk ashes with precursors of sodium-based geopolymers. Silicon carbide whiskers were introduced into sodium-based geopolymers in order to evaluate the response of silicon carbide whiskers to the interfacial bonding and strength of sodium-based geopolymers along with rice husk ashes. Compression, flexural and short beam shear tests were performed to investigate the synergistic effect of rice husk ashes–derived silica and commercially available silicon carbide whiskers. Results show that rice husk ashes–derived spherical silica nanoparticles reduced nano-porosity of the geopolymers by ∼20% and doubled the compressive strength. The simultaneous additions of rice husk ashes and silicon carbide whiskers resulted in flexural strength improvement by ∼27% and ∼97%, respectively. The increase in compressive strength due to the inclusion of silica nanoparticles is related to the reduction in porosity. The increase in flexural strength due to simultaneous inclusion of silica and silicon carbide whiskers suggest that silica particles are compatible with the metakaolin-based geopolymers, which is effective in consolidation. Finally, microscopy suggest that silicon carbide whiskers are effective in increasing bridged network and crack resistance.

Download Full-text

Influence of the Composition of Cement Mortars Modified by Lime or Polymers on the Mechanical Properties and Microstructure of Mortars

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.592-593.647 ◽

2013 ◽

Vol 592-593 ◽

pp. 647-650 ◽

Cited By ~ 2

Author(s):

Małgorzata Lenart

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Reinforced Concrete ◽

Flexural Strength ◽

Polyvinyl Alcohol ◽

Polymer Composites ◽

Adhesion Strength ◽

Hardened Cement ◽

Cement Mortars ◽

Styrene Butadiene

Cement – polymer composites are nowadays widely used in repair systems not only in case of concrete or reinforced concrete constructions but also in masonry. Polymers addition for example already at 5% m.c. modifies the structure of the cement – polymer composite in a way that many of the mechanical properties such as flexural strength, tensile strength or adhesion to substrates are improved. The paper presents the results of tests such as flexural, compressive or adhesion strength to ceramic substrate of hardened cement mortars with different composition, as well as selected cement mortars modified by two polymers: polyvinyl alcohol and styrene – butadiene polymer dosed at 5 % m.c. Four types of cement mortars modified by lime (component used in historical constructions as well as in contemporary masonry mortars) are also examined for comparison.

Download Full-text

Influence of the Fiber Volume Content on the Durability-Related Properties of Polypropylene-Fiber-Reinforced Concrete

Sustainability ◽

10.3390/su12020549 ◽

2020 ◽

Vol 12 (2) ◽

pp. 549

Author(s):

Chenfei Wang ◽

Zixiong Guo ◽

Ditao Niu

Keyword(s):

Reinforced Concrete ◽

Flexural Strength ◽

Volume Content ◽

Polypropylene Fiber ◽

Fiber Reinforced Concrete ◽

Fiber Reinforced ◽

Fiber Volume ◽

Freeze Thaw ◽

Chloride Environment ◽

Polypropylene Fiber Reinforced Concrete

Polypropylene-fiber-reinforced concrete impacts the early shrinkage during the plastic stage of concrete, and the fiber volume content influences the durability-related properties of concrete. The purpose of this paper was to investigate the influence of fiber volume content on the mechanical properties, durability, and chloride ion penetration of polypropylene-fiber-reinforced concrete in a chloride environment. Tests were carried out on cubes and cylinders of polypropylene-fiber-reinforced concrete with polypropylene fiber contents ranging from 0% to 0.5%. Extensive data from flexural strength testing, dry–wet testing, deicer frost testing, and chloride penetration testing were recorded and analyzed. The test results show that the addition of the fiber improves the failure form of the concrete specimens, and 0.1% fiber content maximizes the compactness of the concrete. The flexural strength of specimen C2 with 0.1% fiber shows the highest strength obtained herein after freeze–thaw cycling, and the water absorption of specimen C2 is also the lowest after dry–wet cycling. The results also indicate that increasing the fiber volume content improves the freeze–thaw resistance of the concrete in a chloride environment. Chlorine ions migrate with the moisture during dry–wet and freeze–thaw cycling. The chlorine ion diffusion coefficient (Dcl) increases with increasing fiber content, except for that of specimen C2 in a chloride environment. The Dcl during freeze–thaw cycling is much higher than that during dry–wet cycling.

Download Full-text