9 Stages of Road Paving Works
Stages of Road Paving Works
Stages of Road Paving Works
The implementation of road paving works goes through a number of stages, to learn about them, follow us.
1- The period before starting infrastructure works under the roads
Here are some elements that must be considered before starting road paving works:-
Traffic volume and location.
Terrain and soil characteristics.
Utility, sewage and drainage lines.
Climatic, environmental and residential requirements.
Possibilities for future expansion.
Road maintenance costs.
2- Design and planning stage
Review, discuss and study design plans and prepare implementation plans.
Determine the levels of natural land and design and implementation levels.
Horizontal projections of the road and parking lots.
Horizontal and vertical curves.
Approval of drawings in the absence of comments, or after modifying them in the event of comments.
3- Surveying works
The road axes are confirmed based on the approved survey points and also the natural ground levels are verified.
Ensure the cleanliness of the roads and inspect the cutting result and give the contractor permission to move the excess cutting result outside the site.
When the cutting reaches the required levels, the suitability of the original soil as a base layer for paving is verified.
4- Excavation works
In which the completion of infrastructure works is verified from sewage lines, rainwater drainage lines, electricity, lighting and gas connections.
The natural ground is cleaned and leveled, weeds and roots are removed, and layers of clay are removed with a thickness not exceeding 25 cm.
The excavation result must be transferred to public landfills or to the place specified by the supervising engineer.
Excavation works are carried out in areas with levels higher than the design levels in order to reach levels slightly lower than the design levels below the base layer.
When the excavation reaches the level below the base layer, the laboratory performs compaction tests and soil stability tests. If these tests pass, the contractor can complete the work on them, but if they fail, the soil must be removed until the required soil quality is reached.
5- Backfilling works
Backfilling materials are supplied and samples of the materials are taken to conduct the required tests on them and ensure that they comply with the specifications.
Backfilling is done in layers, each layer approximately 15 cm or according to the project specifications.
The backfill materials are mixed with water harmoniously so that they meet the required moisture conditions and are compacted well by equipment to meet the compaction conditions according to the specifications and conditions.
6- Base layer works
It is a layer of natural soil that can be prepared by treatment, leveling, rolling and placing the paving layer on it.
It is the one that receives full pressure from the paving layer above.
The thickness of the paving layer is determined after conducting several tests.
It provides a uniform surface and achieves regular expansion of the lower layer under the foundation.
Protecting soil layers until the end of earthworks and paving.
Reducing interruptions in project work due to climate change such as rainfall.
Makes light and heavy machinery on the work site move better.
7- Asphalt adhesive layer works
This is done before laying the first asphalt layer using a spraying machine where a sample is made to know the spray rate.
Before laying the asphalt layer, the adhesive layer (RC2) is placed according to the required rate (0.5).
It is necessary to ensure that the surface is clean and the temperature of the asphalt material is at the required rate (0.5).
It is necessary to ensure that the surface is clean and the temperature of the asphalt material is at the required rate (0.5).
It is necessary to ensure that the spray rate is regular and to treat areas where there is an increase in the spray rate by placing a quantity of sand on it and turning it over to take the excess asphalt and then lifting it away from the road.
8- Asphalt layer works
In it, a layer of liquid bitumen of grade (COM) is sprayed at a rate of 1.5 kg \ m2 over the last granular base layer.
9- Concrete side edges of roads
The soil is prepared by compacting it well and at the required level according to the concrete base of the side edges.
The base concrete is poured according to the required dimensions shown in the drawings and concrete cubes are taken to conduct a pressure test on them.
The side edges are built on the concrete base with cement mortar and in straight lines and the front and back supporting concrete is poured.
Before starting the sidewalk layers according to the approved sector, it is ensured that all other works are completed (cables – pipes – column bases).
