An Experimental Overlay with Rolled Concrete


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Title: An Experimental Overlay with Rolled Concrete

Author(s): A. Josa, C. Jofre, and F. Molina

Publication: Special Publication

Volume: 93


Appears on pages(s): 213-242

Keywords: base courses; blended cements; compacting; compressive strength; concrete construction; fly ash; pavements; resurfacing; roads; roller compacted concrete; splitting tensile strength

Date: 9/1/1986

Experience in Spain in the utilization of rolled com-pacted concrete (RCC) for paving has been for the last fifteen years. Up to the present about 4,OOO,OOO m2 of this type of pa-vement has been constructed in low traffic roads. Recently, ho-wever there has been an increase in interest in the use of this material for the overlaying of asphalt pavements of roads that are in use, and so benefitting from the three basic advantages that this material offers: - The possibility of immediate traffic circulation. - The possibility of using conventional machinery in the cons-- truction. - Low cost due to the material used. Blended cements with a high ash cement or cement-fly ash mixtu-res are very suitable to be used in RCC pavements and also in -cement- fly ash-aggregate basecourses. This has been proved by -lab tests and also in several works, the most recent consisting in an experimental overlay, 1,300 km long, on the N-232 road. In this experimental section conclusions have been drawn about the optimum design and composition of the concrete slab. In or-der to do this the section was divided into six parts, in each of these the characteristics of the slab were varied. The fac-- tors taken into consideration were the type of cement used, the quantity of cement per m3 of concrete and the thickness of the slab. The'following parameters were studied in each part of the section: concrete strength, distance between joints, time to -crack appearance, etc. A study was also made of the differen--- tial deflection and load transmission in the joints.