The need at hand was that of a strong pavement capable of bearing severe loads from logging trucks and other specialized equipment. An easy mental image to remember for properly proportioned RCC is a handful of damp gravel.
This cannot be said enough, following the basics can attribute to a succesful application of RCCP.
The lower cement content in RCC, compared to that of conventional concrete, enable the construction process to be overhauled due to the lower heat of hydration that occurs in curing of the material.
Poor compaction Segregation of the mixture, leading to a weaker, inconsistent pavement Surface raveling, tears, and overall rough, open surface texture Construction Practices The process of applying RCCP from production to construction to compaction, is one that requires a timely schedule and minimal interruptions.
So what are those benefits? Meaning that one can place more RCC at a time than conventional concrete. Similiar to what the industry knows as conventional concrete stone, sand, cement, and waterRCC however, is composed up of different proportions and placing methods.
Again, compared to conventional concrete, RCC requires no materials for formwork, calls for no joints or dowels, significantly less manpower for the application, and time saved in opening a recently completed project.
Construction Process Photos RCC discharged from a transit mixer truck to a dumptruck prior to transporation. Roller compacted concrete draws its name from the construction practices used to place and finish the material.
The target market of this primitive pavement was the logging industry of Canada and the northern United States. Prior to paving, the subgrade should be adequately moistened, wet but no standing water or puddling, as well as kept free of foreign material like garbage or other debris.
A mix with excessive moisture can lead to: The two variables that moisture content can directly affect to is: Most of the time, RCC is constructed without joints, formwork, finishing, steel reinforcement, or dowels. The standard means of placing RCCP is by first being placed through a standard or high density paver and subsequently compacted by a non-vibratory or vibratory roller.
Adequate compaction Some things to consider regarding moisture content along the construction process are: For a subgrade that is too wet, the RCC can swell and lead to another failed end result. Roller compacting the fresh joint.
The drier mix allows a high psi to form much quicker than that of a more fluid, hydrated mix. Incorrect subbase preparation can cause inconsistent surface conditions and potentially shorten the life span of the pavement itself.
Take another hard look at this material when durability and longevity are your material needs. Making a significant economic impact in those areas for the job at hand. This refers to the lower cement content in RCC than that of conventional concrete, and in conventional concrete, cement is the most expensive ingredient.
Once RCC is rolled and compacted fully, the material is capable of withstanding traffic and bearing stress immediately. With the use of an asphalt overlay, RCC has been used in trucking roads, highway shoulder rehabilitation, as well as intersection approach lanes.
With the material becoming more and more prominent in the marketplace, there is an increase in the use of RCCP in areas such as; industrial parking, local streets, highway shoulders, as well as other low volume roads. Verify the moisture content of the aggregates prior to mixing Monitor the moisture content of RCC on the job site before paving begins On the below moisture content curve, one ideally would like to be above the optimum moisture point to compensate for the loss of moisture during transportation and sitting time on the job site.For technical assistance regarding roller-compacted concrete, contact the Portland Cement Association or the National CP Tech Center: This Guide for Roller-Compacted Concrete Pavements is a product of the National Concrete Pavement • ASTM D Standard Test Methods for Laboratory Compaction Characteristics of Soil Using.
Roller compacted concrete or RCC was originally limited to the sub-base of roads and airfield pavements, being called lean concrete or dry lean concrete. This type of concrete has become very popular due to the fact that it is a simple material to produce and because it can be placed fast while producing a great surface.
Why is compaction of roller-compacted concrete so important? Similar to conventional concrete, RCC must be consolidated or in the case of roller-compacted concrete (RCC), compacted in order to achieve the desired performance characteristics.
Roller-compacted concrete (RCC) or rolled concrete (rollcrete) is a special blend of concrete that has essentially the same ingredients as conventional concrete but in different ratios, and increasingly with partial substitution of fly ash for Portland cement.
2 Roller-Compacted Concrete Pavement • RCC mixtures require compaction with the use of vibratory, tamper bar screeds, and typically but not always with either static or.
Concrete paving, known as Roller Compacted Concrete, proven in agricultural, industrial, municipal, and commercial applications. % mobile RCC production.Download