Mechanical and Durability Characteristics of Sustainable Coconut Fibers Reinforced Concrete with Incorporation of Marble Powder

The development of nanotechnology continues to grow. The use of nanocement in concrete is expected to reduce the number of pores and improve hydration in concrete and provide more strength to the concrete. The use of natural fibers, in this case, coconut fiber can prevent cracks in concrete and make fiber concrete more ductile than ordinary concrete. The effect of using nanocement on coconut fiber concrete on the strength of the concrete to be studied. Methodology to complete the research objectives, use nanocement used in concrete, which has added coconut fiber. Tests reviewed the value of slump and specific gravity. Then, testing the compressive strength at 7, 24, 28 days. The results obtained were an increase of 48.19% in the strength of concrete. Further research needs to review on mixing nanocement with other natural fibers.

Download Full-text

MECHANICAL PROPERTIES OF COCONUT FIBER-REINFORCED CONCRETE

Proceedings of International Structural Engineering and Construction ◽

10.14455/isec.res.2017.93 ◽

2017 ◽

Vol 4 (1) ◽

Cited By ~ 1

Author(s):

Gino Ng ◽

Girum Urgessa ◽

Yared Shifferaw ◽

Harianto Hardjasaputra

Keyword(s):

Mechanical Properties ◽

Reinforced Concrete ◽

Flexural Strength ◽

Natural Fibers ◽

Fiber Reinforced Concrete ◽

Sustainable Construction ◽

Fiber Reinforced ◽

Coconut Fiber ◽

Concrete Plates ◽

Coconut Fibers

The use of natural fibers in concrete has significantly increased in recent years as a result of the push for sustainable construction. Coconut fibers, also known as coir fibers, have been used as natural fibers in concrete, particularly in some parts of Asia. This paper presents an experimental study that investigates the use of coconut fibers in concrete. Two baseline concrete mix designs were selected based on design standards with a water-cement ratio of 0.4 and 0.5 respectively. For each baseline mix design, four 20 cm x 20 cm x 1 cm concrete plates were constructed by varying the percentage of coconut fibers by weight of cement. The fiber contents studied are 0%, 0.1%, 0.175%, and 0.25%. The concrete plates were then tested to determine the mechanical properties of the coconut fiber-reinforced concrete and comparisons were made with the mix designs with 0% coconut fiber content. The results show that adding coconut fibers increases the flexural strength of concrete plates. This is particularly beneficial for low scale construction applications such as those in concrete tile production. For both mix designs, adding 0.25% of coconut fibers increased the flexural strength of the concrete plates by 90% when compared to concrete with no coconut fibers.

Download Full-text

Axial Compressive Behavior of Reinforced Concrete (RC) Columns Incorporating Multi-Walled Carbon Nanotubes and Marble Powder

Crystals ◽

10.3390/cryst11030247 ◽

2021 ◽

Vol 11 (3) ◽

pp. 247

Author(s):

Abdul Jalil Khan ◽

Liaqat Ali Qureshi ◽

Muhammad Nasir Ayaz Khan ◽

Akhtar Gul ◽

Muhammad Umar ◽

...

Keyword(s):

Carbon Nanotubes ◽

Compressive Strength ◽

Reinforced Concrete ◽

Main Property ◽

Concrete Columns ◽

Sem Analysis ◽

Multiwalled Carbon ◽

Reinforced Concrete Columns ◽

Multi Walled Carbon Nanotubes ◽

Marble Powder

In this study, Multiwalled Carbon Nanotubes (MWCNTs) and Marble Powder (MP) have been utilized in reinforced concrete columns to assess their structural behavior. The nanotubes from 0.025% to 0.20% and 5% MP by weight of cement were used. The compressive strength of reinforced concrete columns and cubes was analyzed as the main property. The incorporation of MWCNTs and marble powder was able to increase the compressive strength of columns by 72.69% and mortar by 42.45% as compared to reference concrete. The ductility was noted to be improved by 42.04%. The load-deformation and stress-strain behaviors were also analyzed. The Scanning Electron Microscopy (SEM) analysis revealed the formation of a strong compact bridge (90–100 layers), Calcium Silicate Hydrate (C-S-H) gel, evenly dispersion, and bridging effect caused by MWCNTs. The incorporation of 0.20% MWCNTs by weight of cement was recommended to be effectively used as a reinforcing agent in concrete.

Download Full-text

Improving the Tensile Energy Absorption of High Strength Natural Fiber Reinforced Concrete with Fly-Ash for Bridge Girders

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.765.335 ◽

2018 ◽

Vol 765 ◽

pp. 335-342 ◽

Cited By ~ 1

Author(s):

Umair Aziz Khan ◽

Hafiz Muhammad Jahanzaib ◽

Mehran Khan ◽

Majid Ali

Keyword(s):

Reinforced Concrete ◽

Fly Ash ◽

High Strength ◽

Fiber Reinforced Concrete ◽

Bridge Girders ◽

Fiber Reinforced ◽

Absorbed Energy ◽

Strength Concrete ◽

The Impact ◽

Coconut Fibers

Nowadays high strength concrete is used in bridge girders due to its improved mechanical properties. However, its behavior is relatively more brittle compared to that of normal strength concrete. Due to the highest toughness among natural fibers, coconut fibers are chosen. In this work, the impact of different fly-ash contents on tensile absorbed energy of high strength coconut fiber reinforced concrete (CFRC-SF) will be investigated for structural application. The mix design ratio of CFRC-SF is 1:2:2 (cement: sand: aggregate) with a water-cement ratio of 0.50 and silica-fume content of 15%. The coconut fibers of 5 cm length and content of 2%, by cement mass, are added. To prepare CFRC-SF5, CFRC-SF10 and CFRC-SF15, different fly-ash contents of 5%, 10% and 15%, respectively, (by cement mass) are added. For determination of splitting-tensile strength, pre-crack/ absorbed energy after crack and toughness indices, cylinders of size 100 mm diameter and 200 mm height are cast and are tested under splitting-tensile load as per ASTM standard. The tensile absorbed energy of CFRC-SF is increased up to 10% fly-ash content. Further study on durability of CFRC-SF is suggested due to the biological nature of coconut fibers.

Download Full-text