Consolidation of Continuously Reinforced Concrete Pavement

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Title: Consolidation of Continuously Reinforced Concrete Pavement

Author(s): Mikael P. J. Olsen

Publication: Special Publication

Volume: 96

Issue:

Appears on pages(s): 39-56

Keywords: aggregate size; coarse aggregates; compacting; concretes; consolidation; continuously reinforced pavements; density (mass/volume); fresh concretes; plasticizers; vibration; vibrators (machinery); Materials Research

Date: 1/1/1987

Abstract:
Current consolidation practices and a recently completed laboratory investigation to determine the effects of coarse aggregate factor, maximum aggregate size, vibrator spacing, and the method of vibrator mounting on the achieved consolidation of CRCP is reviewed. The theory and principles of consolidation by internal vibration are also reviewed. Vibrator spacing, concrete mix design, and acceleration in the concrete are parameters found to be important. A vibratory spacing of 24 in. (610 mm) is required to produce adequate consolidation. The concrete mix should contain coarse aggregate with a top size of 1 « in. (40 mm) and a coarse aggregate factor determined by the Fineness Modulus Method of mix design. The superplasticizers with or without retarders have to be used with great caution due to slump loss, making it difficult to consolidate the stiff concrete mixes used in slipformed paving construction.