Roller concrete
Roller concrete or roller compacted concrete or roller concrete is concrete with zero slump that is strengthened and hardened by vibration by rollers. Two types of roller concrete are used in construction works, massive roller concrete with low cement grade, in the construction of dams and bulky structures such as retaining walls, heavy foundations and embankments, where high strength is not required, and roller concrete with relatively high cement grade. In the fast implementation of highway pavement layers and similar coatings where high mechanical and abrasion resistance is required. The main advantage of this type of concrete is its low cost.
Roller concrete:
Roller concrete or roller compacted concrete or roller concrete is concrete with zero slump that is strengthened and hardened by vibration by rollers. Two types of roller concrete are used in construction works, massive roller concrete with low cement grade, in the construction of dams and bulky structures such as retaining walls, heavy foundations and embankments, where high strength is not required, and roller concrete with relatively high cement grade. In the fast implementation of highway pavement layers and similar coatings where high mechanical and abrasion resistance is required. The main advantage of this type of concrete is its low cost.
Roller concrete is used in the construction of dams, which replaces materials such as earthen dam materials in terms of economy and speed of technique, and in terms of mechanical strength and durability, such as concrete. This technology has been investigated and implemented in different countries under the following headings.
RCD (RCD) Roller Compacted Dam Concrete and RCC (RCC) Roller Compacted Concrete were developed and developed in Japan and America, respectively, and are known as the main methods.
The need to use roller concrete
In many countries, the cost of building concrete dams has increased at a faster rate than similar costs in earthen dams, so that in 1960, about 37% of dams were concrete, and between 1961 and 1970, this number was reduced to 23%. The use of roller concrete in the construction of concrete dams has economic advantages and considerable speed of operation compared to normal dams, and it is considered one of the successful business and efforts of dam construction in the last decade.
Advantages of using roller concrete
High bending strength (3.5-7.5) enables the ability to withstand heavy and intermittent loads without breaking, which leads to a reduction in construction costs and construction time.
High compressive strength – The ability to withstand heavy loads and shocks in factories, military areas and mining equipment.
High shear resistance prevents the creation of grooves caused by the movement of wheels on concrete surfaces and the need for subsequent repairs.
High density and low permeability provide great durability and stability under thawing and freezing cycles.
Low water consumption and low water-to-cement ratio – high strength reduces permeability and increases durability and resistance to chemical attacks.
Interconnection of grains: creating high shear resistance in supports and uncontrolled cracks that prevents vertical displacement and faulting.
It does not require formatting and processing, which increases the speed of construction, reduces costs, and requires less manpower.
A hard and durable surface with a bright color that reduces the cost of lighting in pargings and warehouses against wear and tear.
Reducing the amount of cement used and removing the cooling systems in the body of the dams
Using the usual equipment for transportation and concreting
High concreting speed
Removal of longitudinal seams in dams