Buy the latest types of Bituminous Asphalt at a reasonable price
When it comes to bituminous pavement in cities, the disadvantages of asphalt typically used for construction layers can be outstanding.
bituminous asphalt coating
One of the main problems with road construction in various countries is the destruction and gradual replacement of natural asphalt, which has caused billions of dollars in losses to the national economy, greatly reduced the safety factor of roads and roads, and of course caused a lot of losses.
asphalt for road construction
Asphalt road construction includes multiple steps such as foundation route planning, bituminous coal application, asphalt mix placement, rolling and quality control. In different layers such as base layer, adhesive layer and surface layer, bitumen.
Sidewalks are built. These layers are made of different materials, and the asphalt pavement has different functions. Bituminous road has three layers. Which is as follows:
In a bituminous pavement, the base course layer consists of mineral aggregates mixed along with bituminous materials including such asphalt, stones as well as sands. This coating is used as the base for the positioning of the surface course or binder.
An intermediate layer between the base course and the surface layer is the Binder course layer. That is the first layer in the case of a bituminous two-layer resurfacing. The bituminous binder course, also called the levelling course, is composed of a bituminous-aggregate mixture.
- Bituminous Concrete Layer
A mixture of aggregates continually graded from maximum size to minimum size is a bituminous concrete layer (typically less than 25 mm to 0.075 mm aggregates).
bituminous asphalt paving
Enough bitumen is applied to the blend such that it is essentially impervious to the compacted concrete mix and has reasonable transverse and elastic properties.
What Is Bituminous Macadam?
Sprinkling and Grouting in WBM
Bituminous Macadam (BM) consists of crushed aggregates and bituminous binder heated and mixed in a hot mix plant at specified temperature, transported to the construction site, laid with a mechanical paver and compacted by a roller.
The BM is laid in a compact thickness of 50 to 100 mm. two different gradations of aggregates have been suggested by the IRC to provide open-graded mixture suitable for base course of highway pavements.
Therefore, the BM layer should be covered by a suitable surfacing course before exposing to weather or traffic.
In case there is a delay in laying appropriate bituminous layers ( such as binder course and/or surfacing course) above the BM layers as per the design, at least a seal coat should be applied to prevent Ingress of water during unexpected rains and possible damaged to the BM layer.
With regard to load dispersion properties and toughness, the BM base course is known to be far superior to other forms of base course materials such as penetration macadam, WMM or WBM, providing the overall structural design satisfies the exact specifications at the location.
In terms of the granular base course layer, the equivalence ratios of the BM base course are assumed to be 1.5 m; in other words, one unit thickness of the BM base course layer is considered equal to 1.5-unit thickness of the granular base course layer and therefore of the construction methods of penetration.
Disadvantages of Bituminous Asphalt in Road Construction
The condition of bituminous asphalt and its compliance with international standards depends largely on adherence to pavement construction techniques.
The disadvantages of using bitumen in road pavement is the lack of a high temperature resistant monolithic material that provides a long development time.
Today, the construction industry is one of the most important industries in the world and plays an important role in national development, tourism and income generation.
Because of this, many countries have taken more efforts and measures to increase and develop their share in the international arena.
At the same time, the international community has attempted to fill the existing gaps in recent years by using new and affordable technologies in the road sector and in the construction industry to beautify urban areas and recreational areas.
In many countries, in urban and rural areas, in general, substandard access or sidewalks or lack thereof, as well as the use of old construction methods and pollution of surface water and insufficiency of litter, pits and tables, dust and noxious gases cause greenhouses.
In metropolitan areas, the depletion of groundwater resources and the intensity of pollution and urban pollution are serious threats to the civic affairs of the country. Reduce costs and create new technologies and jobs.
Since the current road construction technology cannot solve and solve this problem, there are people who oppose structural and technological changes in the design and construction of roads and traffic roads.
bituminous asphalt definition
On the other hand, the environmental concerns of using existing materials and hydrocarbons to make up bitumen and hard bitumen powders are used with bitumen and bitumen to achieve many of the necessary technical specifications, especially durability and stability. Climate change and glacial cycles are an alternating process.
Bituminous bitumen is not very resistant to physical pressure, this resistance of the best bitumen in Iran is equal to 75-75 kg/cm2. It deforms with changes in climate and temperature and has a short lifespan.
Using natural bitumen also causes some other problems, and there are some other disadvantages as follows:
Air and Environmental Pollution
The production of bitumen requires a temperature of about 140 degrees Celsius, so a large amount of fuel is required to produce this asphalt, which can be said to be very inappropriate and economical in terms of environment and economy. Air pollution, especially in the subway.
Inconsistent With Weather Conditions
An important part of bitumen quality occurs in cold and wet weather, and factors such as water absorption and freeze-thaw phenomena, water penetration into the substrate or the use of salt to thaw are major factors, bitumen corrosion. Asphalt is experiencing cold weather.
Not Stable to Chemicals
Asphalt Bitumen is degraded by petroleum products such as diesel, petroleum, gasoline, and acids found in industrial applications.
Using Unsuitable Asphalt
Asphalt or asphalt powder used for road construction is directly exposed to atmospheric factors and must withstand the effects of vehicular traffic.
Disadvantages of using asphalt
Application of RCCP
Major and minor roads and streets, highways, runways, hangars, industrial hall grounds, industrial areas and warehouses, docks, mine roads, sidewalks, stadiums, racetracks, industrial and commercial exhibition grounds, commercial areas, ports, docks, farms , winter warehouses, ramps, loops, plazas, driveways, bridges, terminal floors, bus stops, and trucks (garages) can all be named, and probably faster and stronger.
Low water-cement ratio and zero slump of 150 to 300 kg/cm2, which are obtained in processing conditions and high-quality materials that can withstand heavy traffic loads, especially slopes, rounds and traffic loads and stations. It can easily withstand heavy loads. Stiffness and will not deform due to the collapse of hard objects.
The long-term durability of bitumen in tropical and temperate regions is due to its resistance to high temperatures without any deformation.
In cold regions, RCCP is safe and resistant to potential damage due to its low water absorption and resistance to glacial cycling.
Fast implementation, easy maintenance, and initial operation make it a good choice even in emergency situations. It also has excellent environmental compatibility.
RCCP concrete surfaces do not have any environmental concerns in the area of their use as a suitable surface due to the impermeability of their composition to the material and textural properties.
Until the end of the stabilization period, its constituent materials are defined as part of nature.
The gray and neutral colors of RCCP have good heat absorption coefficients and help reduce ambient temperature.
Bitumen Road Construction Process:
The initial surface is prepared by fixing the potholes or rust if any. At least a week before the surface course is laid, Premix chippings fill out the defects.
If the current pavement is extremely high, a sufficient bituminous levelling course of thickness is offered to lay a bituminous concrete surface course on a binder course instead of directly laying it on a WBM.
bituminous asphalt road
It is preferable to lay AC layers over a bituminous base or binder route. A bitumen tuck coat is applied at 6.0 to 7.5 kg per 10 sq.m area, which can be increased to 7.5 to 10 kg for a non-bituminous base.
In a hot mixing plant with the necessary power, the premix is prepared with the desired quality control. It is possible to heat the bitumen up to 150-177 deg C and the aggregate temperature does not vary from the binder temperature by more than 14 deg C.
The hot mixed material is obtained by the transporters from the mixture and delivered to the site at a temperature of 121 to 163 degrees C by a mechanical paver. The camber and the layer thickness are checked correctly.
In the strength of the resultant pavement structure, the regulation of the temperatures during the mixing and the compaction is of considerable importance.
A mixture is thoroughly compacted by rolling at a pace of not more than 5 km per hour after it is put on the base course.
The initial or breakdown rolling is done with a roller of 8 to 12 tons and the intermediate rolling is done with a pneumatic fixed wheel roller of 15 to 30 tons with a tire pressure of 7 kg per sq.cm. With water, the wheels of the roller are kept moist.
The number of passes required depends on the layer’s thickness. On the following day, rolling in warm weather tends to increase the density if the original rolling was not sufficient. Final rolling or finishing is carried out by a tandem roller of 8 to 10 tones.
Advantage of Bitumen Road:
It does not use any joints; it thus offers a flat surface for riding. As compared to concrete pavements, it also has less sound pollution. In the bituminous pavement, wear and tear become less, thereby preserving the smoothness.
A gradual process is a deformation and the failure of the bituminous pavement. The asphalt paving exposes delicate defects.
They have the choice of being easily restored. In reversing the route for traffic, they do not consume time as they set fast.
This helps to carry out staged construction in a situation where challenges are met with fund limitation or traffic prediction problems.
bituminous asphalt sheet
Compared to concrete paving, the initial expense and total maintenance cost of bituminous pavement are smaller.
They are resistant to high melting temperatures and are not impacted by de-icing materials.
Disadvantage of Bitumen Road:
Bituminous surfaces are less durable.
Compared with concrete paving, poor tensile strength.
Extreme weather and inappropriate weather conditions tend to render slippery and porous bituminous pavement.
Bitumen with impurities can cause soil contamination, hence the melting of ground water. In small quantities, it may have hydrocarbons.
During building and service life, blocking of pores and drainage routes.
Further salting-to stop snow in the winter season.
High building costs during extreme temperature conditions.
These dependencies allow one to genuinely enter road traffic so that the properties of a bitumen mix can be varied depending on the measured stress levels. This bitumen flexibility, depending on the path use, results in a wide range of bitumen mixes.
The fact that bitumen has a desirable melting point, which effectively assists in both surface dressing and wearing resistance, is highly appreciable. Although the bitumen melting point is favorable, it can be melted back to its original condition. This is called the method of asphalt recycling.
Instead of taking them to landfill sites, the torn-up asphalt parts are brought back to the recycling facility. It is possible to reuse this recycled blend.
If required, to keep the mix live again, the old bitumen is blended with new bitumen and new aggregates. It is free from hydrocarbons and thus not harmful, as explained in the processing of bitumen.
To get free of organic materials as well as impurities, the substance is refined to the maximum.
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