AS 2758.2:2021 pdf free.Aggregates and rock for engineering purposes Part 2: Specification for sealing aggregate.
This document provides a basis for specifying requirements for aggregates intended for use in sprayed bituminous surfacing. The requirements relate to quality of rock and other properties of coarse aggregate. A coarse aggregate may be produced from rock, gravel, metallurgical slag or suitable synthetic materials.
This document is intended for use by —
(a) federal, state and local government authorities (whether or not they are specifiers);
(b) consultant engineers (whether specifiers or not);
(c) suppliers and purchasers of asphalt aggregates;
(d) testing authorities;
(e) quality system certifiers and accreditation authorities; and
(f) educational organisations.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document.
NOTE Documents referenced for informative purposes are listed in the Bibliography.
AS 1141.3.1, Met hods for sampling and testing aggregates, Method 3.1: Sampling—Aggregates
AS 1141.11.1, Methods for sampling and testing aggregates, Method 11.1: Particle size distribution — Sieving method
AS 1141.11.2, Methods for sampling and testing aggregates, Method 11.2: Particle size distribution for vision sizing systems
AS 1141.14, Met hodsforsampling and testing aggregates, Method 14: Particle shape, by proportional calliper AS 1141.15, Methods for sampling and testing aggregates, Method 15: Flakiness index
AS 1141.18, Methods for sampling and testing aggregates, Method 18: Crushed particles in coarse aggregate derived from gravel
AS 1141.20.1, Methods for sampling and testing aggregates, Method 20.1: Average least dimension- Direct measurement (nominal size 10 imm and greater)
AS 1141.20.2, Methods for sampling and testing aggregates, Method 20.2: Average least dimension- Direct measurement (nominal sizes 5 mm and 7 mm)
AS 1141.20.3, Methods for sampling and testing aggregates, Method 20.3: Average least dimension- Calculation (nomograph)
AS 1141.22, Methods for sampling and testing aggregates, Method 22: Wet/dry strength variation
AS 1141.23, Methods for sampling and testing aggregates, Method 23: Los Angeles value
3 Terms and definitions
For the purpose of this document, the terms and definitions in AS 2758.0 apply.
4 Aggregate classification
Aggregate requirements are specified for the following three aggregate classes:
(a) Class A — Premium quality aggregates suitable for freeways, heavily trafficked highways or pavements carrying a high volume of heavy vehicles.
(b) Class B — Aggregates suitable for highways or main roads carrying medium traffic volumes, medium to lightly trafficked pavements, general parking areas and similar.
(c) Class C — Aggregates suitable for lightly trafficked roads.
NOTE For the purposes of the above classifications—
(a) heavy traffic describes a road with greater than 2 000 vehicles/lane/day;
(b) medium traffic describes a road with greater than 600 but less than 2 000 vehicles/lane/day; and
(c) light traffic describes a road with less than 600 vehicles/lane/day.
Unless it is practical to supply different classes of aggregate to the same project, specifiers should determine the required aggregate class based on the most severe requirements for any road to be sealed under works specification.
The works specification should also consider the type of vehicles when nominating any aggregate classification.AS 2758.2 pdf download.
Tags: Aggregates and rock for engineering purposes
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