количество алита, но увеличилось количество вытянутых кристаллов алита, что сказывается
положительно на прочностных характеристиках цемента в 28-суточном возрасте. Результаты
пониженного тепловыделения экспериментального цемента за первые трое суток можно
объяснить содержанием кристаллов алита, которое предопределяет интенсивное
тепловыделение при твердении, особенно в начальные сроки. А это имеет большое
практическое значение при возведении массивных бетонных конструкций.
СПИСОК ИСПОЛЬЗОВАННОЙ ЛИТЕРАТУРЫ:
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IMPROVING THE STRENGTH OF ASPHALT-CONCRETE PAVEMENT
ABLAKULOV ABDUNAYIM,
JAMOLOV SAIDKAMOLHON KHUSANKHON UGLI
Tashkent state transport university
Annotation:
This article presents the results of research on increasing the strength of asphalt concrete pavements
used on highways. In order to increase the strength of the asphalt concrete coating, the results of tests conducted in
laboratory conditions with the addition of various surface-active additives are presented.
Аннотация
: В данной статье представлены результаты исследований по повышению долговечности
асфальтобетонных покрытий, используемых на автомобильных дорогах. С целью повышения прочности
асфальтобетонного покрытия представлены результаты испытаний, проведенных в лабораторных условиях с
добавлением различных поверхностно-активных добавок.
Annotatsiya:
Ushbu maqolada avtomobil yo’lllarida ishlatiladigan asfaltbeton qoplamalarining mustahkamligini
oshirish bo’yicha tadqiqot natijalari keltirilgan. Asfaltbeton qoplamasining mustahkamligini oshirish uchun turli-xil sirt-
faol qo’shimchalarini qo’shib laboratoriya sharoitida o’tqazilgan sinov natijalari havola etiladi.
Key words:
Asphalt concrete, bitumen, surface-active additives, physical and mechanical properties of asphalt
concrete.
Ключевые слова
: Асфальтобетон, битум, поверхностно-активные добавки, физико-механические
свойства асфальтобетона.
Kalit so‘zlar
: Asfaltbeton, bitum, sirt-faol qo’shimchalar, asfaltbetonning fizik-mexanik xususiyatlari
INTRODUCTION.
The safe and comfortable movement of vehicles depends on the condition of road surfaces.
Currently, asphalt-concrete roads are the main part of public roads in our country. In recent years, as
a result of the sharp increase in the number of large cargo vehicles and the anomalous climate change
in our country in the last 4 years, asphalt concrete pavements have various and visible deformations.
This, in turn, has a negative impact on traffic conditions and safety on highways. In order to prevent
such negative situations, research work was carried out to increase the strength of the asphalt concrete
coating. In particular, in order to increase the durability of asphalt concrete, research works were
carried out in laboratory conditions by adding additional surface-active materials [1].
Recently, various types of SAA have been used both in the republic and abroad; to carry out
experimental work, from the beginning, a search for SAA was carried out to increase the strength
indicators of asphalt concrete and we selected the following materials: Topcel, Xrizopro, Aramid,
Viatop 66, EkoTop, Xrizotop, monoethanolamine (MEA) and polymer-enriched rubber powders [2].
Topcel - It is a raw granulated material consisting of 93-95% cellulose fiber and 7-5% wax
mixture, which is a coating granule. Kolichestvo fiber and granule opredelyaet rashod materiala.
Xrizopro - made on the basis of chrysotile fibers (from 85 to 95 %) with the use of binders on
the basis of bituminous components (from 5 to 15 %).
Aramid is a synthetic fiber with high parameters of density, resistance to temperature
fluctuations and resilience. It has good resistance to various chemical reagents.
VIATOP 66 - ecologically safe natural fibers from cellulose [3]
EcoTop is a stabilizing additive on the basis of chrysotile mineral fiber [4].
Xrizotop is an ecologically safe fiber made from cellulose [5].
Monoethanolamine (MEA) - colorless, viscous hygroscopic liquids with specific odors, for
increasing the viscosity of road bitumen.
METHOD
The appearance of the above surface-active materials is presented in Fig. 1.
The main purpose of the application of SAA is to expand the interval of plasticity, increase the
viscosity and resistance to aging of bitumen, concrete and asphalt concrete, and increase its physical
and mechanical properties.
A)
B)
C)
D)
E)
F)
Figure 1. Types of surface-active materials:
A) Topcel. B) Xrizopro C) Aramid
D) VIATOP 66. E) EkoTop, F) Xrizotop
The size of surface-active material treated with polymer (polybutadiene) on the rubber powder
obtained on the basis of grinding old car tires, which is one of the secondary industrial wastes, is 9.5
mm. Its appearance is shown in Figure 2.
Figure 2. Rubber powder is a surface-active material treated with a polymer (polybutadiene).
We conducted experimental studies in laboratory conditions in order to increase the physical
and mechanical properties of asphalt concrete [2, 6, 7].
RESULT AND DISCUSSION
The above-mentioned surface-active materials were added to asphalt concrete, their
composition was selected, samples were prepared in laboratory conditions according to the
requirements of GOST-9128, test-research works were carried out (see Fig. 3) and the results are
presented in the table 2.
A)
B)
C)
D)
E)
F)
Figure 3. Preparation and testing of samples of asphalt concrete mixture based on GOST:
A) Quality control of bitumen B) Asphalt concrete C) Process of mixing materials D) Preparation
of samples E) Samples ready for testing
F) sample testing process
Table 1.
№
Name of materials
Selected composition
at %
1
Crushed stone fr. 5-20 mm
50
2
Sand from crushing screenings
38
3
Mineral powder
12
4
Bitumen BND 60/90
6
6
5,7
4,5
5
Surface active
additives
- TOPCELL
0,5 % of
the total
mass AС
- Xrizopro
0,5 % of
the total
mass AС
- EkoTop
0,5 % of
the total
mass
bitumen
- Rubber powder
12,5 % of
the total
mass
bitumen
Xrizotop
0,3% of
the total
mass AС
Viatop 66
0,4 % of
the total
mass AС
Aramid
0,5 % of
the total
mass AС
Monoethanolamine
(MEA)
0,05% of
the total
mass
bitumen
*Comment: The total mass AС - the total mass asphalt concrete
Table 2.
Comparison of physical and mechanical properties of asphalt concrete according to test results
№
The name of indicators
unit of
measure
According
to GOST
Actual results
Without
additives
Topcell
Rezina
kukuni
Ekotop
Xrizopro
Xrizotop
Viatop
66
Aramid
1
Ultimate compressive strength at a
temperature of 50 °C , not less than
МPа
0,7
1,2
1,8
2,2
1,2
0,96
1,86
1,57
1,7
2
Ultimate compressive strength at a
temperature of 20 °C , not less than
МPа
2,5
2,4
6,0
7,0
3,7
3,3
2,93
2.38
2,8
3
Ultimate compressive strength at 0 °C ,
no more
МPа
3,0-6,5
3,2
4,2
3,8
4,4
4,2
13,3
15,1
15
4
Water resistance, no less
-
0,75
0,79
0,83
0,99
0,80
0,96
0,92
0.96
0.96
5
Average density
g/cm3
-
2,35
2,35
2,39
2,39
2,40
2,38
2.38
2,38
CONCLUSION.
The following conclusions can be made based on the results of research
conducted in laboratory conditions.
- We used two different methods to increase the durability of asphalt concrete.
Method 1. Adding surface-active additives to bitumen. adding surface-active materials to
bitumen in the following ratio gives high efficiency" Monoethanolamine (MEA)- 0.05% of the
total mass bitumen, EkoTop- 0.5% of the total mass bitumen, rubber powder 12.5% of the total
mass bitumen.
Method 2. Adding surface-active materials to asphalt concrete: Topcell - 0.5% of the total
mass AS, Khrizopro - 0.5% of the total mass AS, Khrizotop - 0.3% of the total mass AS, Viatop
66 - 0 .4% of the total mass AS, Aramid - 0.5% of the total mass AS was added.
Adding these surfactants improved the physical and mechanical properties of asphalt
concrete (Table 2). At the same time, due to the addition of surface-active materials, the durability
of the asphalt-concrete pavement is increased, and various deformations (cracks, shifts, ruts, etc.)
that appear in it are reduced, and its service life is increased by at least 25-35%.
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