The benefits of replacing a proportion of cement with fly ash in concrete mixes have been well understood for many years, particularly in the mitigation of alkali silica reactions. In pavement concrete mixes, however, the properties of fly ash can often play havoc in controlling the amount of air in...
The Case For Lower Strength Gain and Early Age Acceptance of Concrete for Road Pavements
The objective of this paper is to encourage informed discussion among concrete pavement engineers. In New South Wales there is a substantial length of contemporary concrete highway construction. A very large inventory of concrete strength results is available. These have shown that construction specification requirements are being significantly exceeded in...
Investigation on the effect of low carbon, low shrinkage, high flexural strength envisia® concrete on industrial floor and pavement application
The key structural element in most industrial enterprises is the concrete floor slab. The aim of floor design is to select the most economical thickness while considering sufficient reinforcement to control the amount and size of cracks to a level consistent with the intended use of the floor. However, one...
Intricacies Surrounding the Machine Placement of Concrete Pavements in Tunnels: Current state of Practice.
Transport tunnels built in Australia within the past 25 years have typically been designed and constructed consecutively. However, in recent years Australia (and Sydney in particular) is witnessing these projects being delivered concurrently, which are in turn diluting the skills pool across all facets of the industry. Sydney is currently...
Concrete Highway Pavement Load Capacity for Possible Future Increases in Permissible Axle Loads
From time to time there is discussion within Government and industry about measures to improve freight transport efficiency. These discussions often include increasing permissible axle loads. If this was to happen it may also be limited to major road transport corridors. This paper neither supports nor sets out a case...
Development of RCC (USA), Getting concrete pavements on the road & open more quickly
This Presentation on Roller Compacted Concrete (RCC) experience in the U.S.A outlines: What is RCC and RCCP? Does it have a place on Australian projects? Is RCC still Slipformed Concrete’s Ugly sister? Application Examples of RCCP – Roads – Industrial Why is North America leading the world?
The Advantages of Furnace Bottom Ash Products in Providing Pavement Ground support in Soft Soils and Wet Weather.
With more concrete pavements being constructed over soft soil foundations, the use of coal combustion products, such as furnace (bottom) ash, to provide bridging of soft areas and reduced construction risk by being able to be placed insitu in wet weather, becomes more critical. The use of such materials in...