· a vacuum, RCC maintenance requirements are minimal.

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Last updated: September 12, 2019

·         Early sitting timeOne of the best properties that Roller Compacted Concrete has, is that it can be constructed way cheaper and faster than the asphalt pavements. Roller Compacted Concrete is normally used with conventional or sometimes high-density asphalt-type paving equipment and compacted with rollers, which eliminates the need for forming and finishing. Usually, Roller Compacted Concrete can be competed just on one roll. Extremely thick and heavy-duty pavements that require thicknesses more than 25 cm may need two layers. The high density and compaction of this concrete allow it to achieve sufficient load carrying capacity quickly and in some cases, it is possible to be open to traffic within 24 hours after placement.

 ·         DurabilityRoller Compacted Concrete has high strength as rigid pavement that can hold the repetitive loads that act on it form traffic. As it can evenly carry heavy loads, RCC will neither rut from heavy axle loads, nor will it deform or tear from turning or braking vehicles. Additionally, RCC has all of the durability of normal concrete pavement including resistance to fuels, oils, solvents and other fluids, and the ability to withstand the extremes of summer heat and winter cold. According to some studies and experiments, a properly designed RCC pavement will normally provide more than 20 years of service.  ·         Low MaintenanceAs the normal concrete, Roller Compacted Concrete is known to have a fewer repairs over its service life. Indeed, it is proven that there is no seal coating or resurfacing required. Aside from an occasional cleaning with a sweeper or a vacuum, RCC maintenance requirements are minimal.

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 ·         Competitive CostConsidering the economic aspect during construction and selection of materials will is an important factor that should play a main rule in the decision making process, and the Roller compacted concrete has the right characteristics that makes it a better choice that saves money and satisfy the strength requirement for a certain. If Roller Compacted Concrete is to be compared to the cost of the normal asphalt pavement or even compared to normal concrete the cost may drop to 25% or even 30% according to some studies. That may be associated with the increase in price of row material like oil and asphalt. This factor has its influence on the decision making during the selection of materials process by the users and that gives an advantage for the roller compacted concrete, especially knowing that this type of concrete requires low maintenance requirements. ·         SustainabilityWhen it comes to sustainability, the characteristics of this type of concrete play main rule in that, as they have some directs and indirect impacts on the surrounding environment. For instance, According to some experiments, the lighter that the Roller Compacted Concrete pavements have can cause of saving energy consumption up to 37% and that is by a higher reflectivity that this concrete has, which causes in the reduction of light requirements.

Moreover, the higher reflectivity can cause a reduction of heat evolved that is caused by the sun and that is up to 7-10 degrees. All of that can prove that RCC is environmentally friendly. ·         Compressive Strength High levels of compressive strength are in fact achieved by this type of concrete due to several factors, one of the main factors is the densely graded aggregates used in the mixture of this concrete. As well as, the low water/cement ratio that also contributes in the high compressive strength levels, every mixture proportion has an optimum moisture content at which it achieves the maximum dry density and this density usually provides the maximum strength. The compressive strength of RCC is comparable to that of normal concrete, typically ranging from 27.

6 to 42 MPA. Some projects have reached compressive strengths higher than 48 MPA; however, practical construction and cost considerations would likely specify increased thickness rather than strengths of this nature. ·         Flexural StrengthFlexural strength is highly related to the density and compressive strength of the concrete mixture. In properly constructed Roller Compacted Concrete pavements, the aggregates are densely packed and minimize the development of fatigue cracking. The density of the paste and the strength of its bond to the aggregate particles are high due to its low water/cement ratio. As a result, the flexural strength of Roller Compacted Concrete, depending on the mix design, is generally high—ranging from 3.5 to 7 MPA.

Based on results which are obtained from a test section, the relationship between the compressive and flexural strengths of Roller Compacted Concrete seems to be similar to that for normal concrete and can be represented by the equation below:Where:fr = flexural strength (third-point loading), MPAfc = compressive strength, MPAC = a constant between 9 and 11 depending on the RCC mix ·         PermeabilityThe permeability of RCC is a major factor determining the ease with which this concrete may become saturated and susceptible to frost damage permeability is also a factor governing the extent to which any steel present in RCC may be attacked by aggressive liquids and be corroded. In the context of dams, permeability plays an important role in the controlling seepage and the deterioration related to freezing and thawing. Permeability is dependent on the voids in the compacted Roller Compacted Concrete and the porosity of the mortar matrix. Therefore, it is most affected by mixture proportioning, method of placement and degree of compaction. Hardened Roller Compacted Concrete is considerably more permeable than normal proportioned and placed concrete due to entrapped voids. The use of silica fume and finer cement appears to reduce the coefficient of permeability to some extent.

However, the method of curing does not seem to make any appreciable difference.

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