PAVEMENT MATERIALS

Quarry Products Newcastle is able to manufacture materials to satisfy almost all road material specifications presented to us, however in an attempt to rationalise the possible permutations we have standardised upon the following road material specifications:

RTA3051
RTA3052
ARRB SR41
APRG Rpt#

Unbound & Modified......Base & Subbase
Material To Be Bound....Base & Subbase
Residential Street Pavements
Light Traffic Pavements

UNBOUND PAVEMENT MATERIALS

Specification unbound road-bases are produced by blending aggregates & dusts to the requirements of the specification whereas non-spec materials are run of crusher type products that can often meet the job requirements at a much more advantageous price than the strict specification type materials. Provided below is listing of standard products with description and uses:

Product Name	Description - Specification	Typical Uses
DGB 20	Spec RTA 3051 20mm nom top size low PI High quality dense graded road-base	Used in quality applications such as main roads, arterial roads and airports. Requires surface to be sealed
DGS 40	Spec RTA 3051 40mm nom top size. High quality dense graded sub-base	Used underneath DGB 20 or other quality road-base
DGS 20	Spec RTA 3051 20mm nom top size. High quality dense graded sub-base	Used underneath DGB 20 or other quality road-base
GMB 20	Spec RTA 3051 20mm nom top size low PI High quality macadam road-base	High quality base as for DGB 20 used when permeability required in base
GMS 40	Spec RTA 3051 40mm nom top size High quality macadam sub-base	Sub-base for roads that require medium level of permeability
MS 75	Spec RTA 3051 75mm nom top size High quality macadam sub-base	Sub-base for roads that require high level of permeability
Arrb 20 Base	Spec Arrb SR41 & APRG Rpt 21 20mm nom top size, low PI base material	Base material for subdivisional & industrial applications – surface to be sealed
Arrb 20 Sub-base	Spec Arrb SR41 & APRG Rpt 21 20mm nom top size, sub-base material	Sub-base material for subdivisional & industrial applications
Arrb 30 Sub-base	Spec Arrb SR41 & APRG Rpt 21 30mm nom top size, sub-base material	Sub-base material for subdivisional & industrial applications
20 FCR	Non spec 20mm nom top size base material	Suitable for temporary roadways, access tracks & hard stand areas
20, 30 or 40 Sub-base	Non spec sub-base materials	Suitable for sub-base and sub-grade applications mainly for lightly trafficked areas & embankment building
Overburden	Non spec friable soil aggregate mix that overlies our fresh rock deposit, no topsize control	Suitable for plastic road base situations for unsealed roads as well as lightly trafficked sealed roads, also for selected sub grade material.
Screened Overburden	Non spec nom 75mm top size - friable soil aggregate mix that overlies our fresh rock deposit	Suitable for plastic road base situations for unsealed roads as well as lightly trafficked sealed roads, also for selected sub grade material.
Selected Rock	Non spec material removed beneath overburden but above fresh rock, contains much more hard rock fragments than the straight overburden.	Suitable as fill and selected sub-grade material.

Stocks are held at the quarry for most of the above materials. When customers require other materials with different specifications we will check that we are able to make the product then slot these products into vacant production cycles should the need arise.

Production control of unbound pavement materials is attained by internal testing of input products and resulting blended outputs. Confirmation that internal controls are working is achieved by regular conformance testing of stockpile products by independent NATA laboratories.

MODIFIED & BOUND PAVEMENT MATERIALS

For situations where more rigid pavements are required to solve poor site conditions, pozzolanic materials can be incorporated into a road-base to change the strengths (UCS) or physical characteristics of the road base. The process of adding pozzolans to road-bases is commonly called stabilisation. The common stabilised materials are divided into 3 classes depending upon the resultant UCS achieved:

Modified materials are specified as having UCS < 1 MPa,
Lightly bound pavement materials need UCS between 1 and 4 MPa,
Heavily bound pavements have their UCS > 4 MPa.

Pozzolanic materials used include Ground Granulated Blast Furnace Slag (GGBFS) and Fly Ash (FA) which recycles waste materials from other industries whilst Hydrated Lime (HL) and Cement are primary pozzolanic materials produced for this purpose. The pozzolans are added at the stipulated percentage through mechanical mixes called pugmills that provide a uniformly mixed product of road-base, pozzolan and water. Percentage additions are usually of the order of 1 to 5% unless FA is being used where higher percentages of around 8 to 10% would be more typical.The RTA 3052 specification provides production requirements for the Material to be Bound (MTBB) when under RTA contract however most other road-base materials are also “improved” with the addition of pozzolanic materials.