Question 1

Stone Mastic Asphalt

Accepted Answer

Stone Mastic Asphalt (SMA) surface course materials are produced using high-quality aggregates, bitumen and cellulose fibres.
 
We supply Commercial SMA, which is designed for low-traffic uses (eg house fronts and driveways), while Industrial SMA is for more heavy-duty requirements and larger traffic movements.
 
Our SMA materials are suitable for private roadways, driveways, yards, carparks, house fronts, etc.
 
Key features & benefits
 • Has good deformation resistance
 • High-strength
 • Durable
 • Available in a range of mixes
 • Made from local materials to the highest standards
 • 100% recyclable
Technical specification
 • IS EN 13108-5 Stone Mastic Asphalt
 • NSAI’s Standard Recommendation (SR) 28
 • IS EN 13108-20: Type Testing and IS EN13108-21: Factory Production Control

Question 2

Polymer Modified Stone Mastic Asphalt

Accepted Answer

Polymer Modified Stone Mastic Asphalt (PMSMA) is a gap-graded mix laid at a thickness of between 30mm and 40mm. It is manufactured using a polymer modified binder (PMB), giving the aggregate skeleton additional strength.
 
It’s used in constructing new roads and overlaying existing roads. It’s highly durable and has resistance to deformation.
 
PMSMA must be designed and manufactured in accordance with the NRA Specification for Road Works, when used on national roads. All coarse aggregates must have a PSV value of 60 or greater when skid resistance is required.
Key features
 • Nominal size aggregate 14mm
 • Layer thickness 30mm-40mm
 • Binder grade: Polymer Modified Binder (PMB)
 • Binder content 5.0%-6.5%
Key benefits
 • Reduces water spray
 • Is textured and skid-resistant
 • Is consistent in appearance
 • Has good rutting resistance and load spreading
 • Decreases road noise levels
 • Has superior rideability
 • Is a cost-effective alternative to HRA
Typical applications
 • Motorways, national routes and other heavily trafficked roads
 • Overlay material to provide required texture

Question 3

Hot Rolled Asphalt

Accepted Answer

Roadstone Hot Rolled Asphalt (HRA), a predominantly sand-based bituminous mix, is a durable surfacing material; its high sand and binder content make it almost impervious.
 
It has a wide range of uses – from private works to national primary and secondary roads. In 30% and 35% HRA mixes, pre-coated chippings are applied to its surface at determined spread rates to provide texture.
 
Key benefits
 • Resists compaction
 • Durable
 • Near impervious layer
 • Available in a range of mixes
 • Made from local materials to the highest standards
 • 100% recyclable
Technical specification
 • IS EN 13108-4 Hot Rolled Asphalt
 • NSAI’s Standard Recommendation (SR) 28
 • IS EN 13108-20: Type Testing and IS EN13108-21: Factory Production Control

Question 4

Marshall Asphalt

Accepted Answer

Marshall Asphalt mixes are highly durable, have good rutting resistance and are used for airport runways, taxiways, industrial yards, house driveways, etc. The recent production of Marshall Asphalt with modified binders further enhances its performance.
 
A wide range of mix types can be supplied, including fuel-resistant and polymer modified mixes.
 
Key benefits
 • High deformation resistance
 • Good load-bearing
 • High resistance to moisture damage
 • Impermeable surface
 • Good riding characteristics
 • Available in a range of mixes
 • Made from local materials to the highest standards
Technical specification
 • Asphalt IS EN 13108-1 Asphalt Concrete
 • Airport Authority Specifications
 • IS EN 13108-20: Type Testing and IS EN13108-21: Factory Production Control

Question 5

Thin Layer Asphalt

Accepted Answer

Thin Layer Asphalt is a specialised surfacing material with high stone aggregate content, crushed rock fines and Polymer Modified Bitumen (PMB) for binding. With excellent resistance to deformation and good surface texture, it is used on major and minor roads.
 
Key benefits
 • Lower road noise levels due to texture and porosity
 • Reduced water spray
 • Good rutting resistance and load-spreading ability Available in a range of mixes
 • Made from local materials to the highest standards
 • 100% recyclable
Technical specification
 • IS EN 13108-5 Stone Mastic Asphalt
 • NSAI’s Standard Recommendation (SR) 28
 • IS EN 13108-20: Type Testing and IS EN13108-21: Factory Production Control

Question 6

Asphalt Concrete

Accepted Answer

Asphalt Concrete (Bitumen Macadam) is a mixture of aggregate, filler and bitumen. Depending on the end application, it can be dense, medium or open-graded.
 
Macadams can be classified into three main layer categories: base, binder and surface course, with different combinations of aggregate and binder. Base and Binder Course materials usually form the lower layers in a pavement, giving it its load-bearing capability. The properties of the Surface Course depend on the performance requirement.
 
Asphalt Concrete is used in national primary and secondary roads, driveways, carparks, pathways, etc.
 
Key benefits
 • Durable
 • Uniform even finish
 • Good load-bearing
 • Versatile material: available in a range of mixes for different uses
 • Made from local materials to the highest standards
 • 100% recyclable
Technical specification
 • IS EN 13108-1 Asphaltic Concrete
 • NSAI’s Standard Recommendation (SR) 28
 • IS EN 13108-20: Type Testing and IS EN13108-21: Factory Production Control
EN 13108 notes: Asphalt Concrete in accordance with EN 13108-1 has replaced the previous references to Coated Macadam in accordance with BS 4987.The new European Standards have introduced a number of changes to classify the materials, but in essence the materials are the same as those previously prescribed.
One addition to this new Standard is the use of Marshal-type surface courses, often used for industrial units and private driveways. They have a smooth finish to withstand scuffing and ravelling when compared to the more traditional macadam-type surface courses.

Question 7

Duraflex

Accepted Answer

A high-PSV aggregate surface course material, Duraflex – as the name implies – is both durable and flexible. Thanks to its aggregate composition and mix design, it’s strong and extra-resistant to rutting (compared, eg, to Hot Rolled Asphalt).
 
It’s primarily used for road surfacing for national primary and secondary roads, and urban streets.
 
Key benefits
 • Durable, flexible and high-strength
 • Resists deformation
 • Reduces tyre noise
 • Complies with NRA texture requirements
 • Available in a range of mixes
 • Made from local materials to the highest standards
 • 100% recyclable
Technical specification
 • IS EN 13108-5 Stone Mastic Asphalt
 • NSAI’s Standard Recommendation (SR) 28
 • IS EN 13108-20: Type Testing and IS EN13108-21: Factory Production Control

Question 8

Concrete

Accepted Answer

Due to the black colour of the bitumen used in the mix, the conventional choice of colour for bituminous materials has been either black or deep red. However, DM Morris can supply a recently developed pigmentable ‘clear’ binder, which allows a greater variety of colours to be produced to suit the customer’s needs. Even the conventional red can be enhanced.
 
These pigmentable binders can be used in a variety of mixes including thin surface courses, SMAs and the more traditional asphalt concrete (macadam).
 
They can be used to create visual awareness of traffic calming or cycle-lane delineation, or to enhance the surface to blend in or contrast with the surrounding area.
 
They are laid hot in the traditional manner, either by hand or with a conventional paver.

Question 9

Coloured Materials

Accepted Answer

DM Morris provides a full range of Readymix Concrete, from mortar to structural concrete. We supply all sectors, including residential, industrial, commercial and civil engineering, and cater for all concrete mix requirements from 5.0 N/mm2 to 60 N/mm2. We can provide special mixes on request.

Question 10

Hot Applied Thermoplastic

Accepted Answer

Hot Applied Thermoplastic is a hard-wearing material for heavily trafficked roads. It can be applied as a flat or profiled line, by screed, spray or extrusion, and sets by temperature loss – hardening within about 60 seconds of application.
 
White and yellow are the main colours used, but others are available.
 
Hot Applied Thermoplastic road marking allows solid glass head to be added, which enhances the reflectorisation effect and thus greatly intensifies the visibility of road markings at night time. It is also more durable than road paint.
 
Technical specification
 • All materials used comply with IS EN 1871: Road Marking materials – Physical Properties
 • In-situ performance in accordance with IS EN 1436: Performance Specification for Road Markings
 
Key benefits
 • Can be coloured to specifications by adding pigments
 • Sets quickly and adheres strongly to the surface
 • Extra additives can be added to maintain its colour and improve its reflectivity
 • Perfect for touching up faded road markings or ones that need added reflectivity
 • Enhances road safety – highly reflective at night or in poor visibility
 • Can be laid thickly and built up to create rumble strips to warn drivers of upcoming danger spots or to slow down
 • Highly durable, requiring less frequent maintenance or replacement, so very cost-effective
 • Application of extra surface glass particles increases skid resistance
 • Can be used for horizontal road signage to complement stop signs or guide traffic
 • Highly customisable, so can be used for many forms of marking, including cycle lanes, bus lanes, carparks and bus stop

SURFACING & MACADAM PRODUCTS

DM Morris provides full-scale road construction for all public,commercial and private contracts, infrastructural developments and carpark construction.

We provide high-quality, safe and reliable products and services. All civil engineering products are produced from local quarries maintained in compliance with National Roads Authority and Euronorm specifications.

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