Roller compacted concrete properties containing high percentage fly ash and high silica fume

Abstract EN

Concete pavement has widely been used around the world.

Recently, among different types of concrete pavement roller compacted concrete (RCC) has been used as an alternative to conventional concrete pavements.

Roller Compacted Concrete (RCC) is based on the concept that a no-slump concrete mixture transported, placed, and compacted with the same construction equipment that is used for earth and rockfill dam it can meet the design specifications for conventional mass concrete.

RCC must be effectively consolidated, And dry enough to support the weight of a vibratory roller, yet enough to permit adequate distribution of the paste throughout the mass during the mixing and compaction operation.

In this study, different percentages (10, 20, 30, 40, 50, 60) % of both fly ash and silica fume were used as cement replacement, concrete mix design and the construction technique used for specimen preparation are relative to roller compacted concrete technology.

The tests of mechanical properties of RCCP as compressive strength, and permeability were carried out.

The test results showed that the addition of silica fume and flyash can obviously modify the mentioned characteristics and satisfy the required conditions for Roller Compacted Concrete Pavements (RCCP) based on ACI 325-1R.