DEVELOPING ECONOMICAL ROLLER COMPACTED CONCRETE MIX FOR PAVEMENTS: 1. INTRODUCTION

INTRODUCTION

1.1 A Different Kind of Concrete

Roller Compacted Concrete or RCC, takes its name from the construction method used to build it. It is placed with conventional or high-density asphalt paving equipment, and then compacted with rollers. Roller Compacted Concrete has the same basic ingredients as conventional concrete: cement, water, and aggregates, such as gravel or crushed stone. But unlike conventional concrete, it’s a drier mix-stiff enough to be compacted by vibratory rollers. Typically, Roller Compacted Concrete is constructed without joints. It needs neither forms nor finishing, nor does it contain dowels or steel reinforcing. These characteristics make Roller Compacted Concrete simple, fast, and economical.

1.2 Roller Compacted Concrete Pavement Performace

   1.2.1 Smoothness

Pavement smoothness is particularly important for a Roller Compacted Concrete project, and also for economy the following steps can be taken to improve the final results:

If high-speed traffic operations are required, a thin 50 – 75 mm (2-3 in.) layer of asphalt or bonded concrete can be placed over the Roller Compacted Concrete slab to provide a smooth traveling surface. Diamond grinding of the Roller Compacted Concrete surface has also been used, and can provide additional smoothness without the construction of a surface overlay.

1.3 Objective

The objective of this research was to construct a test cube for economical Roller compacted concrete. Specific topics to be investigated include:
Determine the appropriate proportion of 12 mm size metal and dust in Roller Compacted Concrete.

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