Design and evaluation of two-layer roller compacted concrete

The aim of this research is to evaluate and design two-layer Roller Compacted Concrete (RCC) systems with different aggregate sizes and types and different placement conditions in order to expand the application of RCC in pavements. Mechanical properties, bond strength properties, durability characteristics, surface properties, fatigue damage, joint deterioration and pavement design are the main. A range of testing equipment, methodologies and tools have been used in this investigation. The findings of this study showed that a two-layer RCC system can achieved good strength and stiffness for each of the mixtures in the two layers. Also, the inter-layer bond was found to be strong when the two layers were placed within one hour, but weaker when the upper layer was placed three hours after the lower layer. Moreover, the durability of the two-layer RCC system was found to be acceptable, especially when the upper layer was placed within an hour of the lower layer. The surface characteristics for the upper layer of RCC showed that the minimum requirement for skid resistance and texture depth have been achieved. However, it is suggested that further investigation is needed, particularly into the evenness of RCC. In conclusion, the results obtained show that the two-layer RCC are a valid alternative for pavements. On one hand, the use of a harder and more resistance aggregate at the top layer guarantees higher skid resistance and durability, while limiting for the use of high quality aggregate. On the other hand, the results show that adequate construction techniques can alleviate the problems arising from the lack bond between layers.

Language

  • English

Media Info

  • Pagination: 1 file

Subject/Index Terms

Filing Info

  • Accession Number: 01703580
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Apr 30 2019 9:29AM