Strength is one of the most important properties of concrete and now a days different material are being used to enhance the strength property of concrete. The research aims to study the effect of basalt fibre on strength of concrete. M30 grade of concrete was used in this experiment. Basalt fibre were added in different proportion as 0%, 0.1%, 0.2% and 0.3 % by volume of concrete. Tests were conducted to determine the compressive strength , split tensile strength and bending strength of concrete. A gain in strength of concrete was observed when basalt fibre was used at 0.2% by volume of concrete.
Introduction
I. INTRODUCTION
Basalt is an extrusive igneous rock. It is formed from rapid cooling of lava having low viscosity. On earth basalt is found in abundance, around 90% of volcanic rock is basalt. The richness in silica content of basalt is responsible for its low viscosity. Basalt fibre is derived from the fine fibres of basalt which has better physicomechanial properties than other fibres used in construction such as fiberglass. It is much cheaper than other fibres and is also easily available. Crushed basalt rock are melted at 15000C and continuous filament of basalt fibres are produced having high specific strength and increased elastic modulus. Out of those fibres, the thicker one is used in the form of chopped strand for reinforcement in concrete. Several researches have been carried out to increase the strength of concrete by addition of different silicious material. The effect of basalt fibre on the strength of concrete was investigated and increase in strength property of concrete is found . The research aims to find the correct proportioning of basalt fibre for its optimum usage for enhancing the strength of concrete.
II. MATERIAL USED
For conducting experimental study following materials has been used :
Cement :OPC 53 grade cement was used for experimental purpose.
Fine aggregate : Sand conforming to zone II were used , passing from 4.75mm sieve and retained on 60 micron sieve.
Coarse aggregate : maximum 20mm size coarse aggregate were used.
Basalt fibre : basalt fibre of length 16mm were used for experimental purpose.
Table 1 : Properties of basalt fibre
Length
Density
Break elongation
Modulus of elasticity
Tensile strength
Water absorption
16 mm
2.61 g/cc
3.12 %
84 Gpa
4.25 Mpa
<0.4
Table 2 : Chemical composition of basalt fibre
S.No
Chemical name
Composition
1
Sio2
50.7 % - 57.8 %
2
Al2O3
14 % - 16.9 %
3
CaO
5.6 % - 8.8 %
4
MgO
3.5% - 5.8%
5
Na2O + K2O
3.9 % - 6.1%
6
TiO2
0.8% - 2.22%
7
Fe2O3 + FeO
9.3% - 15.6 %
8
Others
0.09% - 0.23%
III. SPECIMEN DETAILS
Cubes specimen of standard size were casted for determination of compressive strength and cylinder specimen were casted for the split tensile strength . For determining bending strength molds were casted. Basalt fibre was added in different proportion as 0%, 0.1% , 0.2% and 0.3% by volume of concrete in experimental specimens. Design mix of M30 grade concrete was used and specimen were tested after 28days.
Table 3 : Specimen Detail
S.no
Proportion of basalt fibre
Length of basalt fibre
Specimen quantity
Cube specimen size for compressive strength
Cylindrical specimen size for split tensile strength
Specimen size for bending strength
1
0 %
-
3
150 x 150 x 150 mm
150mm diameter
100 mm x 100 mm x 500mm
2
0.1 %
16 mm
3
150 x 150 x 150 mm
150mm diameter
100 mm x 100 mm x 500mm
3
0.2 %
16 mm
3
150 x 150 x 150 mm
150mm diameter
100 mm x 100 mm x 500mm
4
0.3 %
16 mm
3
150 x 150 x 150 mm
150mm diameter
100 mm x 100 mm x 500mm
IV. EXPERIMENTAL INVESTIGATION
Specimen were casted for different proportions of basalt fibre and test were performed under standard procedure and conditions after 28 days of curing.
Table 4: Compressive strength of cube specimen
S.No
Detail of cube specimen
Number of cube sample
Average Compressive strength
1
BFRCCS 0
3
32.23 Mpa
2
BFRCCS 0.1
3
34.19 Mpa
3
BFRCCS 0.2
3
35.25 Mpa
4
BFRCCS 0.3
3
31.88 Mpa
Table 5: Split Tensile strength of cylindrical specimen
S.No
Detail of cylindrical specimen
Number of cylindrical sample
Average split Tensile strength
1
BFRCTS 0
3
2.83 Mpa
2
BFRCTS 0.1
3
3.21 Mpa
3
BFRCTS 0.2
3
3.95 Mpa
4
BFRCTS 0.3
3
3.15 Mpa
Table 6: Bending strength of concrete specimen
S.No
Detail of specimen
Number of sample
Average bending strength
1
BFRBS 0
3
4.35 Mpa
2
BFRBS 0.1
3
4.72 Mpa
3
BFRBS 0.2
3
4.98 Mpa
4
BFRBS 0.3
3
4.53 Mpa
V. RESULT AND DISCUSSION
There was an increase in strength of concrete specimen on addition of basalt fibre. The addition of basalt fibre of 0.2 % by volume of concrete provides the better result as compared to the conventional mix concrete and it was found that further increase in amount of basalt fibre tends to reduce the strength of concrete. The use of basalt fibre in low composites for concrete construction may provide better strength at lower cost of basalt fibre.
References
[1] Bureau of Indian Standards “ Plain and Reinforced concrete code for practice “ IS 456 :2000
[2] Sangmesh V Biradar, M Sai Dileep , Dr T Vijaya Gowri “ Study of concrete mechanical properties with basalt fibre” IOP conference series Material science and Engineering 2020
[3] Krishan Pareek , Dr Purnachandra Saha “ Basalt fibre and its composites: An overview “ COAST 2019
[4] Navnath Raut , Urmila Kawade “ Conventional concrete by using basalt fibre “ IRJET vol 4, issue 7 – 2017
[5] K.Sathes Kumar , K. Tamilarasan, N.Sathish Kumar, “ Analysis of basalt fibre in concrete “ IJCR , 2017
[6] Maria Wlodarczyka , Igor Jedrejewskia “ Concrete slab strengthened with basalt fibre “ Experimental tesr results Procedia Engineering 153 (2016) 866-873
[7] Elshafie, S. and Whittleston. G. “ A review of the effect of baalt fibre length and proportion on the mechanical properties of concrete, IJRET VOl 4, Issue 1- 2015
[8] GAuvin F. , Cousin P. and Robert M. “ Improvement of interphase between basalt fibres and vinylester by nano reinforced post sizing “ 2015
[9] Mr Gore Ketan R , Suhasinu M Kulkarni “ The performance of basalt fibre in high strength concrete” journal of information, Knowledge and research in civil engineering, vol 2, issue 2 – 2013
[10] A. Tabsheer , A. Abid , Experimental study on mechanical properties of basalt fibre reinforced concreten. IJSR 2013