INTERNATIONAL MULTIDISCIPLINARY JOURNAL FOR
RESEARCH & DEVELOPMENT
SJIF 2019: 5.222 2020: 5.552 2021: 5.637 2022:5.479 2023:6.563 2024: 7,805
eISSN :2394-6334 https://www.ijmrd.in/index.php/imjrd Volume 12, issue 08 (2025)
233
METHODS OF INCREASING THE DURABILITY OF ASPHALT-CONCRETE AND
ROAD SURFACES
Ismailov Sarvarbek Takhirjanovich
Teacher, Andijan State Technical Institute, Andijan, Uzbekistan
Abstract.
The issues of increasing the durability of asphalt concrete pavements in modern
conditions of high-speed movement of vehicles are considered. The operation of asphalt
concrete pavements in a wide frequency range is shown. The results of tests for the fatigue life
of asphalt concrete at different loading frequencies are presented. Design solutions are proposed
to increase the fatigue life of asphalt concrete pavements.
Keywords:
asphalt concrete pavements, fatigue life, testing, design solutions.
INTRODUCTION
The continuous increase in traffic intensity on highways, the increase in the load-bearing
capacity of vehicles and axles, and the increase in speed limits require a new approach to
considering the issues of road surface strength. The main factors determining the strength of
asphalt concrete pavements are traffic loads, the design and condition of the road surface, and
climatic conditions. The development of effective methods for increasing the strength of asphalt
concrete pavements should be based on the study of the properties of asphalt concrete taking
into account real loading conditions.
Experimental research
Experimental studies conducted at stationary observation points made it possible to obtain
information about the real dynamic stress-strain state of road structures and to conclude that the
asphalt-concrete pavement is subject to dynamic effects in a wide frequency range. When the
bucket moves from the wheel of the machine, bending deformations do not develop in the
asphalt-concrete layer. The components of the asphalt-concrete mixture perform high-frequency
vibrations that vary in phase and amplitude, and destruction occurs with the appearance of
cracks in the voids formed as a result of the decomposition of the mineral material. In this
process, the role of the elastic properties of bitumen decreases, and the role of adhesion
between the components of asphalt-concrete increases [1-4].
To establish the effect of polymer and adhesive additives on the fatigue failure mechanism,
asphalt concrete samples No. 1 (asphalt concrete mixture of type B without additives),
composition No. 2 (asphalt concrete mixture of type B with 0.3% RTEP of polymer additive)
and asphalt concrete mixture of type B with surfactant additive of composition No. 3 were
tested. The tests were conducted at low (17 Hz) and high (50 Hz) loading frequencies.
Comparison of test results at low frequencies shows a significant increase in the failure time by
samples with polymer additives (2.6 times). The effect of SAW on fatigue strength, in contrast
to low frequencies, was more pronounced when tested at high frequencies.
In order to objectively assess the durability of asphalt-concrete pavements in modern conditions
of intensive high-speed traffic, it is necessary to switch to new methods of testing asphalt-
concrete, corresponding to the repeated impact of vehicles on loading conditions. and the
selection of asphalt-concrete composition taking into account the estimated number of
applications of the calculated load over the entire service life.
To increase the fatigue life of asphalt-concrete pavements on roads with high traffic intensity,
new design solutions are required: the use of asphalt-concrete mixtures with polymer-bitumen
binders in the lower layers of the pavements; the use of an organic binder with high adhesive
properties in the upper (closed) layers of the pavement (if they are absent, the introduction of
INTERNATIONAL MULTIDISCIPLINARY JOURNAL FOR
RESEARCH & DEVELOPMENT
SJIF 2019: 5.222 2020: 5.552 2021: 5.637 2022:5.479 2023:6.563 2024: 7,805
eISSN :2394-6334 https://www.ijmrd.in/index.php/imjrd Volume 12, issue 08 (2025)
234
surfactant additives into the bitumen is mandatory); the use of dense mixtures with a high
bitumen content in the composition at the highest tensile stresses (the lower layer of the asphalt-
concrete layer "package"), as well as reinforcing layers [5-7].
The use of modified bitumen
- bitumen reinforced with polymers or rubber increases the
elasticity and resistance to cracking of asphalt.
Additional fillers
- adding mineral powder, fibers or other reinforcing materials - increase the
wear and deformation resistance of asphalt.
Improving the production and laying process
Laying at optimal temperature
- the quality of asphalt concrete depends on temperature, and
improper laying in extremely cold or hot conditions leads to rapid deterioration of the coating.
High-quality mixing
- asphalt and filler materials must be evenly distributed.
Compaction by pressure
- compaction of the asphalt coating using special roller and vibratory
equipment, making it strong and durable.
Reinforcement of the main layer
Preparing a solid and dense base
- the gravel, sand and geogrid layers under the asphalt
concrete layer must be of high quality.
Improving the drainage system
- the accumulation of water can corrode the asphalt, causing
cracking and deformation. Therefore, the water drainage system must be well planned.
Maintenance and prevention
Regular maintenance
- if small cracks and potholes are closed in a timely manner, they will
not be allowed to grow larger.
Protective coatings
- special protective coatings can be applied to the asphalt to protect it from
water, UV light and chemical effects.
Preventing scratches and cracks
- durability is increased by controlling the weight of vehicles
and using protective layers on the asphalt surface.
CONCLUSION
In order to objectively assess the durability of asphalt-concrete pavements in modern conditions
of intensive high-speed traffic, it is necessary to switch to new methods of testing asphalt-
concrete, corresponding to the repeated impact of vehicles on loading conditions. and the
selection of asphalt-concrete composition taking into account the estimated number of
applications of the calculated load over the entire service life.
To increase the fatigue life of asphalt-concrete pavements on roads with high traffic intensity,
new design solutions are required: the use of asphalt-concrete mixtures with polymer-bitumen
binders in the lower layers of the pavements; the use of an organic binder with high adhesive
properties in the upper (closed) layers of the pavement (if they are absent, the introduction of
surface-active additives into the bitumen is mandatory); the use of dense mixtures with a high
bitumen content in the composition at the highest tensile stresses (the lower layer of the asphalt-
concrete layer is the "package"), as well as reinforcing layers.
REFERENCES
1.Abramov Yu.V. "Yo'l sirtlari va poydevorlari" - Moskva, Transport, 2001 yil.
2.Miroshnichenko A.I. "Asfalt-beton qoplamalar texnologiyasi" - Moskva, Stroyizdat, 1990 yil.
3.Kozlov V.V. "Asfalt-beton aralashmalari va ularni qo'llash" - Moskva, Transport, 1985 yil.
4.P. S. Kandhal "Asfalt qoplamalari: muhandislar va arxitektorlar uchun dizayn, ishlab
chiqarish va texnik xizmat ko'rsatish bo'yicha amaliy qo'llanma" - CRC Press, 2016 yil.
5.Hiks R. G., Scholz T. V. "Polimer bilan o'zgartirilgan bog'lovchilar bilan asfalt qoplamasining
ishlashini yaxshilash" - Qurilish muhandisligi materiallari jurnali, 2003 yil.
6.Malygin V.I. "Yo'l sirtlari uchun polimer qo'shimchalari" - Moskva, Transport, 2005 yil.
7.Whiteoak D. "Shell Bitum qo'llanmasi" - Tomas Telford nashriyoti, 2015 yil.
