AS/NZS 2891.7.1:2015 PDF Download

AS/NZS 2891.7.1:2015 is a standard that specifies a method for determining the maximum density of asphalt using the water displacement method. This method involves either an on-balance approach or an under-balance weighing method.

In the on-balance method, a sample of compacted asphalt is immersed in a container filled with water, and the water volume displaced by the sample is measured. The mass of the sample is then determined using a weighing balance. The maximum density of the asphalt is calculated by dividing the mass of the sample by the volume of water displaced.

Alternatively, the under-balance weighing method involves placing the sample inside a container suspended from a balance. The sample is then submerged in water, and the balance is adjusted until the sample is neutrally buoyant. The weight of the sample is recorded at this point, and the maximum density is determined by dividing the weight of the sample by the volume of water displaced.

This standard provides guidance on performing these methods and specifies the equipment and conditions necessary for accurate measurements. It ensures that the determination of maximum density of asphalt is performed consistently and reliably within the construction industry in Australia and New Zealand.