THE USA JOURNALS
THE AMERICAN JOURNAL OF ENGINEERING AND TECHNOLOGY (ISSN
–
2689-0984)
VOLUME 06 ISSUE10
164
https://www.theamericanjournals.com/index.php/tajet
PUBLISHED DATE: - 30-10-2024
https://doi.org/10.37547/tajet/Volume06Issue10-18
PAGE NO.: - 164-168
STRENGTH AND DEFORMABILITY OF
BASALT FIBER-REINFORCED CONCRETE
Xolmirzaev Sattor Abdujabborovich
Professor, Doctor of Technical Sciences at Namangan Engineering-
Construction Institute, Uzbekistan
Gulamiddinov Sarvarjon Gayratjonovich
PhD Candidate, Namangan Engineering-Construction Institute, Uzbekistan
INTRODUCTION
Concrete reinforced with basalt fiber exhibits
higher strength compared to concrete without
basalt fiber. Tests were conducted to determine
the nature of the change in strength of basalt fiber-
reinforced concrete over time. Samples prepared
for testing consisted of two types of materials:
concrete cubes with basalt fiber and concrete
cubes without basalt fiber. Tests were conducted
over periods of 28, 90, 180, and 360 days. The most
rapid increase in the strength of basalt fiber-
reinforced concrete was observed in the period up
to 28 days. However, the subsequent strength
increase was greater in the samples with basalt
fiber than in the samples without it. The difference
in strength between samples with and without
basalt fiber after 28 days ranged from 17-41%
after one year compared to the 28-day strength.
Based on the test results, the compressive strength
of concrete with basalt fiber is higher than that of
concrete without basalt fiber. As can be seen from
Table 1, the compressive strength of concrete with
basalt fiber remains higher over time than that of
concrete without basalt fiber. The analysis results
show that regardless of the testing method, the
compressive strength of basalt fiber-reinforced
concrete is on average 30-40% higher than that of
concrete without basalt fiber.
The highest value of the modulus of deformation
was observed in 28-day samples of concrete with
basalt fiber. In tests conducted after 90 days, the
modulus of deformation for basalt fiber-reinforced
concrete increased by 17%, while the modulus of
deformation for concrete without basalt fiber
remained nearly unchanged (Table 2). This
behavior is related to the curing dynamics of basalt
fiber-reinforced concrete. In the initial stage, the
intensity of curing and the effect of high
temperature accelerate cement hydration, which
hinders the increase in the modulus of
deformation. Research indicates that the reduction
in the modulus of deformation of samples with
compressive strength of 16.0 MPa does not exceed
24-13-11%.
RESEARCH ARTICLE
Open Access
Abstract
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The following formula is recommended for
determining the modulus of deformation of basalt
fiber-reinforced concrete:
*
*
*
3130
3
B
в
R
p
=
(1)
Here:
•
R - the average density of concrete, t/m³;
•
R - the cubic strength of concrete, MPa;
•
BB - the coefficient accounting for the reduction in strength of basalt fiber-reinforced concrete
under normal conditions.
Figure 1. Elasticity Coefficient of Basalt
Fiber-Reinforced Concrete
Figure 2. Ultimate Compressibility of
Basalt Fiber-Reinforced Concrete
•
x - Without basalt fiber
•
Δ
- With basalt fiber
The change in the cubic strength of basalt fiber-reinforced concrete and concrete
without basalt fiber over time
.
Table 3.1.
№
пп
Condition
of storage
The cubic compressive strength of
basalt fiber-reinforced concrete
(MPa) over time (in days) is as
follows:
The work condition coefficient of
basalt fiber-reinforced concrete at
various times is as follows:
Recomended
value
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28
60
90
180
360
28
60
90
180
360
1.
2.
Basalt
fiber-
reinforced
Non
-
reinforced
(without
basalt
fiber)
24.2
------
135
17,9
-----
100
24,9
-----
139
18,4
-----
103
25,2
------
141
19,1
5
-----
107
25,9
-----
145
19,69
------
110
26,5
-----
148
20,2
------
-
113
-
1,35
-
1,34
-
1,31
-
1,31
-
1,3
-
1,3
The preparation time of basalt fiber-reinforced concrete affects its strength and deformation properties.
Table 2.
Condition
of
storage
The age of
concrete in
days.
Volume weight
(kg/m³)
R,
MPa
R
в
,
MPa
К
вс
Е
в
МPa
вс
10
-5
Basalt
fiber-
reinforced
Non
-reinforced
(without basalt
fiber)
28
60
90
180
360
28
60
90
180
360
2410
2405
2390
2390
2390
2340
2320
2300
2280
2280
16,5
18,8
18,6
20,7
23,2
17,9
18,1
18,3
19,04
20,8
13,7
14,0
14,3
15,4
16,8
14,1
14,2
14,4
14,9
15,2
0,83
0,78
0,76
0,74
0,72
0,78
0,78
0,78
0,78
0,74
13000
13800
15300
15800
16100
12400
12500
12500
13200
14000
190
194
197
208
215
205
205
241
237
259
The value of this coefficient is determined by the
following formula:
Where:
•
- Modulus of deformation of basalt
fiber-reinforced concrete samples;
•
- Modulus of deformation of
concrete samples without basalt fiber.
For calculating reinforced concrete structures
made from basalt fiber-reinforced concrete, .
Change in Ultimate Compressibility of Basalt Fiber-
Reinforced Concrete
Table 3
т/р
Curing conditions
The change in the ultimate compressibility of
basalt fiber-reinforced concrete under normal
conditions.
28
60
90
180
360
1
Basalr fiber-reinrorced
196
202
209
227
236
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2
Non-reinforced basalt
202
210
219
237
249
It can be concluded that the ultimate
compressibility of basalt fiber-reinforced concrete
varies slightly from its limiting value. The ultimate
compressibility of basalt fiber-reinforced concrete
depends on its curing conditions. As shown in
Table 3, the ultimate compressibility of basalt
fiber-reinforced concrete samples is 11% higher
than that of samples without basalt fiber.
Experiments indicate that the actual value of
ultimate compressibility in basalt fiber-reinforced
concrete is relatively higher than that in concrete
without basalt fiber, and this value depends on its
strength as well as the time when the load is
applied. The change in the ultimate compressibility
of basalt fiber-reinforced concrete is presented in
Table 3.
The increase in the average values of ultimate
compressibility suggests that it should be viewed
in conjunction with the age of the concrete at the
time of loading and its curing conditions. The
relationship between these factors can be
determined using the following expression:
*
1
,
36
10
*
3
2
3
R
в
−
=
−
(3)
Here:
•
R
–
the cubic strength of concrete (MPa) at the time the load is applied.
This expression (3) confirms the existence of a
relationship between ultimate compressibility and
its strength. The theoretical calculations
conducted indicate that they are close to the
experimental values. Since the ratio between the
experimental values and theoretical calculations is
shown to be 1.05, this confirms that formula (3)
can be practically applied.
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