Production of Durable High Strength Flowable Mortar Reinforced With Hybrid Fibers

2018 ◽  
Vol 9 (1) ◽  
pp. 10 ◽  
Author(s):  
Eethar Thanon Dawood ◽  
Mahyuddin Ramli
Keyword(s):  
Silica Fume ◽  
Impact Load ◽  
Activity Index ◽  
High Strength ◽  
Steel Fibers ◽  
Partial Replacement ◽  
Hybrid Fibers ◽  
Synthetic Fibers ◽  
Static Modulus ◽  
Static Modulus Of Elasticity

This study deals with the production of durable high strength flowable mortar (HSFM). Firstly, the optimum percentage of silica fume was determined due to Pozzolanic Activity Index (P.A.I) test. Secondly, the selected mortar reinforced by different percentages of steel fibers or hybrid fibers of  steel fibers , palm fibers and synthetic fibers (Barchip) to prepare HSFM mixes. Such mixes were tested in compressive strength, splitting tensile strength, static modulus of elasticity, flexural strength, toughness indices determination, and impact load for all the mixes. Lastly, the effects of seawater exposure on the properties of HSFM have been observed. The results show that the use of 10% silica fume as a partial replacement of cement indicate the best P.A.I. On the other hand, the hybridizations of such fibers enhance the performance of HSFM mixes. In addition, the hybrid fibers reduce the permeability of HSFM leading to significance improvement against seawater exposure.

scholarly journals Influence of Hybrid Fibers on Toughness Behavior of High Strength Flowing Concrete

2011 ◽  
Vol 57 (3) ◽  
pp. 249-260 ◽  
Author(s):  
Eethar Thanon Dawood ◽  
Mahyuddin Ramli
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Modulus Of Elasticity ◽  
Hybrid Composite ◽  
High Strength ◽  
Steel Fibers ◽  
Hybrid Fibers ◽  
Static Modulus ◽  
Static Modulus Of Elasticity ◽  
Strength And Toughness

Abstract This study investigates the use of steel fibers and hybrid composite with a total fibers content of 2% on the high strength flowing concrete and determines the density, compressive strength, static modulus of elasticity, flexural strength and toughness indices for the mixes. The results show that the inclusion of more than 0.5% of palm fibers in hybrid fibers mixes reduces the compressive strength. The hybrid fibers can be considered as a promising concept and the replacement of a portion of steel fibers with palm fibers can significantly reduce the density, enhance the flexural strength and toughness. The results also indicates that the use of hybrid fibers (1.5 steel fibers + 0.5% palm fibers) in specimens increases significantly the toughness indices and thus the use of hybrid fibers combinations in reinforced concrete would enhance their flexural toughness & rigidity and enhance their overall performances

scholarly journals Evolution of Durable High-Strength Flowable Mortar Reinforced with Hybrid Fibers

2012 ◽  
Vol 2012 ◽  
pp. 1-10
Author(s):  
Eethar Thanon Dawood ◽  
Mahyuddin Ramli
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Modulus Of Elasticity ◽  
High Strength ◽  
Experimental Tests ◽  
Steel Fibers ◽  
Synthetic Fiber ◽  
Hybrid Fibers ◽  
Static Modulus ◽  
Static Modulus Of Elasticity

The production and use of durable materials in construction are considered as one of the most challenging things for the professional engineers. Therefore, this research was conducted to investigate the mechanical properties and the durability by using of different percentages of steel fiber with high-strength flowable mortar (HSFM) and also the use of the hybridization of steel fibers, palm fibers, and synthetic fiber (Barchip). Different experimental tests (compressive strength, splitting tensile strength, flexural strength, and static modulus of elasticity among others) were determined after 90 days of normal water curing and 180 days of seawater exposure. The results indicate that hybrid fibers of 1.5% steel fibers + 0.25% palm fibers + 0.25% Barchip fibers provide significant improvement in the different mechanical properties of HSFM. Besides, the hybridization of fibers was found to be effective in the terms of durability (exposure to seawater). Therefore, the minimum reduction in static modulus of elasticity, compressive, splitting and flexural strength was obtained for the HSFM mixes of hybrid fibers using steel fibers with palm fibers and also for the use of steel, palm, and Barchip fibers.

scholarly journals Effects of Steel Fibers Geometry on the Mechanical Properties of SIFCON Concrete

2020 ◽  
Vol 6 (1) ◽  
pp. 21-33 ◽  
Author(s):  
Shahad S. Khamees ◽  
Mohammed M. Kadhum ◽  
Nameer A. Alwash
Keyword(s):  
Mechanical Properties ◽  
Steel Fiber ◽  
Volume Fraction ◽  
Fiber Reinforced Concrete ◽  
Steel Fibers ◽  
Partial Replacement ◽  
Fiber Volume ◽  
Fiber Network ◽  
Static Modulus ◽  
Static Modulus Of Elasticity

This research aims to shed light on the effect of steel fiber shape, length, diameter, and aspect ratio on the mechanical properties of slurry infiltration fiber reinforced concrete (SIFCON). This study comprised of casting and testing three groups of SIFCON specimens with 6% fiber volume fraction. The first group was reinforced with micro steel fiber, other reinforced by hook end steel fibers, while the last group of specimens reinforced by mixing two shape of steel fiber as hybrid fiber (3% micro steel fiber +3% hook end steel fiber). Silica fume was used as a partial replacement (10%) by weight of cement. 3.7% super plasticizer was used to make the slurry liquid enough to penetrate through the fiber network, while the w/c ratio kept constant at 0.33. It was found from the results achieved that the compressive strength, static modulus of elasticity, splitting tensile strength and toughness are extremely affected by the geometry of fibers because the network of fibers formed and their density depends on the size and shape of fibers. Where the values of micro steel fibers are far outweighing the values of hooked end fibers. It was also deduced from empiricism results that combining long and short fibers gives excellent results.

scholarly journals Developing a Sustainable Concrete using Waste Glass and Rubber for Application in Precast Pedestrian Slabs

2021 ◽  
Vol 7 (5) ◽  
pp. 786-803
Author(s):  
Asish Seeboo ◽  
Chetanand Choollun
Keyword(s):  
Plain Concrete ◽  
Mean Value ◽  
Partial Replacement ◽  
Sustainable Concrete ◽  
Durability Properties ◽  
Static Modulus ◽  
Fine Glass ◽  
Pre Treatment ◽  
Natural Aggregates ◽  
Static Modulus Of Elasticity

In this piece of research, n attempt was made to produce a sustainable concrete with the partial replacement of both fine and coarse natural aggregates with two different non-biodegradable wastes. The selected wastes were fine glass and shredded rubber tires. Fine glass passing through 4.75 mm BS sieve was utilised for the partial replacement of fine natural aggregates. Coarse natural aggregates were partially replaced with shredded rubber passing through 20 mm sieve and retained on 6.30 mm sieve. Several mixes with varying % of fine glass but with a fixed 10 % of shredded rubber were tested. Optimum fine glass content was determined to be in the order of 20 %. The resulting concrete exhibited lower plastic and hardened densities (2040 and 2117 kg/m3 respectively) in comparison to normal plain concrete. The static modulus of elasticity was found to be 18.3 GPa (mean value), while the splitting tensile strength was 2.37 MPa. The flexural strength showed a significant increase of 20.3% compared to the control mix. The results concluded that the concrete thus produced is a viable means of disposing of such non-biodegradable wastes (rubber and glass), thus reducing the loads at landfills. This new genre of concrete was produced at a lower cost than normal concrete because of the very low pre-treatment costs of the recycled wastes used. Furthermore, the properties tend to indicate that the concrete could be applied where lower strength and high durability properties are warranted. Hence precast slabs were made from the new design concrete and were tested along a stretch of a highly trafficable pedestrian walkway on the University campus. The slabs were continuously monitored for defects such as cracks, broken corners and slabs for a period of 24 consecutive weeks. After the test period it was observed that only 4 out of the 80 precast slabs had hairline cracks. Hence concluding the enhanced durability properties of the new design concrete. Doi: 10.28991/cej-2021-03091690 Full Text: PDF

scholarly journals Mechanical Behaviour of Steel Fibers Added High Strength Concrete with GGBS and Silica Fume Replacements

2019 ◽  
Vol 9 (1) ◽  
pp. 4449-4452
Keyword(s):  
Carbon Dioxide ◽  
Silica Fume ◽  
Mechanical Behaviour ◽  
High Strength ◽  
Future Generation ◽  
Partial Replacement ◽  
Cement Production ◽  
Effective Utilization ◽  
Steel Fibres ◽  
Carbon Dioxide Gas

Sustainable development implies meeting current needs without compromising the ability of future generation to meets their own needs. It also requisites that development be undertaken, in a manner, that planetary resources are sustained by effective utilization, without unnecessary wastage. Cement production emits carbon dioxide gas and hence its partial replacement by GGBS and silica fume reduces them. These materials have cementitious properties. This is significant because the production of one ton of Portland cement results in emission of nearly equivalent amount of Carbon dioxide. The study undertakes the variation of important properties of M40 grade concrete, namely compressive, split tensile and modulus of elasticity with addition of these replacements in varying percentages. These properties determine the mechanical behaviour of concrete in structures. Steel fibres are also added as a fixed percentage to the concrete, as it improves its ductility and toughness and reduces its susceptibility to cracking. Comparison of the variation of properties with and without addition of steel fibres is also made, to bring out the beneficial aspects of its addition

Macro, Micro and Nanoscale Bamboo Fiber as a Potential Reinforcement for Composites

2015 ◽  
Vol 668 ◽  
pp. 11-16 ◽  
Author(s):  
Viviane da Costa Correia ◽  
Fabíola Maria Siqueira ◽  
Rafael Donizetti Dias ◽  
Holmer Savastano
Keyword(s):  
Mechanical Properties ◽  
High Strength ◽  
Bamboo Fiber ◽  
Partial Replacement ◽  
Synthetic Fibers ◽  
Chemical Pulping ◽  
Tropical Areas ◽  
Bamboo Fibers ◽  
Mechanical Nanofibrillation ◽  
Inorganic Matrices

Vegetal fibers are obtained from leaves, stalks, culms, fruit and seeds, and have been used in the macro, micro and nanoscale as partial replacement of synthetic fibers in organic and inorganic matrices. Bamboo has high strength fibers, and is one of main nonwood resources and is available in tropical areas worldwide. These characteristics justify the study and application of bamboo fiber as reinforcement in the macro, micro and nanoscale. The macrofibers were obtained from bamboo culms, the microfibers from the chemical pulping and the nanofibers were obtained from the mechanical nanofibrillation of the pulp. The fibers were subjected to chemical, physical, mechanical and morphological tests. There was modification in the chemical composition of the bamboo after pulping, such as decrease of amount of the lignin, hemicellulose and extractives in 42.4%, 33.3% and 83.7%, respectively.The bamboo fibers width have been reduced from 0.26 mm to 19.8 μm after pulping and after nanofibrillation process the width was reduced from 19.8 μm to 16.2 nm.The decrease of the fibers dimension can be seen from the micrographs and analyzing it mechanical properties, the bamboo fibers are a reinforcement potential in macro, micro and nanoscale to organic and inorganic matrices.

Impact Resistance of Steel Fibre Reinforced Thin-Walled Shell Structures

2014 ◽  
Vol 1000 ◽  
pp. 203-206
Author(s):  
Stanislav Řeháček ◽  
Petr Huňka ◽  
David Čítek ◽  
Ivo Šimúnek
Keyword(s):  
Positive Impact ◽  
Impact Load ◽  
Impact Resistance ◽  
Shell Structures ◽  
Impact Loads ◽  
Test Machine ◽  
Static Modulus ◽  
Thin Walled ◽  
Drop Weight Test ◽  
Static Modulus Of Elasticity

Fibre-reinforced composite materials are becoming important in many areas of technological application. In addition to the static load, such structures may be stressed with short-term dynamic loads or even dynamic impact loads during their lifespan. Dynamic effects can be significant especially for thin-walled shell structures and barrier constructions. Impact loading of construction components produces a complex process, where both the characteristics of the design itself and the material parameters influence the resultant behavior. It is clear that reinforced concrete with fibers has a positive impact on increasing the resistance to impact loads. Results of impact load tests carried out on drop-weight test machine are presented in this paper. The results are supplemented by static modulus of elasticity.

Sign in / Sign up

Export Citation Format

Share Document