Its impressive durability lends itself to be used in the most heavily trafficked areas, often where other systems have failed. Its high aesthetic qualities have resulted in Imprint being used on some of the most aesthetically demanding and prestigious sites where in the past only natural materials would have sufficed.

Following successful installations in the USA, Imprint is now available to be used on schemes where in the past block paving or stamped asphalt/concrete would have been considered. If you want the look of block paving but want it to last many years without any maintenance, Imprint is the only solution.

Imprint® Specification

PART 1 GENERAL

1.1 DESCRIPTION

A. Imprint is a Hot Applied Polymer Modified Synthetic Asphalt Surface Treatment that is used extensively on crosswalks, intersections, sidewalks, downtown revitalizations and traffic calming applications.
B. Imprint is especially suitable for locations with high numbers of vehicles per day, and is formulated to have very good resistance to rutting and deformation.
C. The materials used to create Imprint incorporate graded sand and granite aggregates, reinforced with two types of fibers. All Imprint materials are produced under a quality system in accordance with ISO 9002 quality assurance, and designed to provide durability, load carrying capacity and architectural compatibility with the environment. All raw materials are carefully graded for consistency and quality to obtain the highest standards.
D. Imprint is supplied as a through colored material so surface abrasion will not detract from the overall color of the material.
E. Imprint can overlay the existing pavement surface, or be installed flush and level with the existing surface.
F. Imprint is available in a variety of colors and patterns.

1.2 DEFINITIONS

A. “HMA pavement” is Hot Mix Asphalt pavement.
B. “PCC pavement” is Portland cement concrete pavement.
C. “Owner” means the Owner and refers to the representative person who has decision making authority for the Work.
D. “Certified Installer” refers to a contractor authorized by Dynamic Surface Applications, Ltd. to install Imprint.

1.3 SUBMITTALS

A. The certified installer shall provide proof of their completion of a minimum of five (5) previous successful Imprint installations.
B. Provide a copy of proof of purchase of Imprint materials as supplied by Dynamic Surface Applications, Ltd.
C. Stamping pattern(s) and colors must be submitted to the Owner for approval prior to starting the Work.
D. The construction of mockups is at the discretion of the Owner.

PART 2 PRODUCTS

The Hot Applied Polymer Modified Synthetic Asphalt Surface Treatment material incorporates polymers, binder resin, pigment, graded silica sand, graded course aggregates and reinforcing fibers.

2.1 GRADE SELECTION GUIDE

Grade 45: For use in Northern US/Canada – light/medium traffic in Southern USA Grade 60: For use in rest of US states on heavily trafficked roads Grade 70: For use in hot climate states

2.2 AVAILABLE PATTERNS

A. Brick
B. Herringbone (90° & 45° angle)
C. Cobble Stone
D. Basketweave
E. Granite Sett

PART 3 EXECUTION

3.1 PRECONDITIONS

A. Imprint can be installed over preexisting pavements or new pavements. The pavement must be in excellent condition; more specifically, it must be free from defects such as cracks, settlement, visible seams, ruts, bird baths and spalling.
B. For preexisting pavements, the pavement can be milled out entirely to accommodate the Imprint material or the Imprint can overlay the existing pavement.
C. For new pavements, a high quality, highly stable HMA pavement or PCC pavement underlay is a prerequisite for the installation of the Imprint system.
D. Cracking and settlement of the underlayment will reflect through the Imprint. Good and proper construction procedures for the installation of the underlayment must be followed in order to mitigate cracking of the Imprint.
E. If the preexisting pavement is smooth or polished, it is not suitable to apply Imprint. A skid resistance of 40 or less will require the pavement surface to be roughened.
F. For PCC pavement underlay that has properly installed construction joints, it is recommended to lay the Imprint pattern in such a way that the natural joints of the pattern coincide with the construction joints in the substrate. This will mitigate reflective cracking through to the Imprint.

3.1.1 New HMA pavement underlay.

A. Prepare the subbase in accordance with good practices.
B. Generally the HMA pavement mix design for roadways as prescribed by the local jurisdiction will be sufficient for the installation of Imprint.
C. Installation is to be in accordance with good practices.
D. Installing HMA pavement by hand (handwork) is specifically excluded for the preparation of HMA pavement underlay.
E. Before installing Imprint, the HMA pavement is to cure and be exposed to traffic for a minimum of 14 days.

3.1.2 New PCC pavement underlay.

A. Prepare the subbase in accordance with good practices.
B. Generally the PCC pavement mix design for roadways as prescribed by the local jurisdiction will be sufficient for the installation of Imprint.
C. Installation is to be in accordance with good practices.
D. The concrete must be a minimum of 28 days old before installing Imprint.
E. All concrete substrates are to be treated with a primer. The specified primer must dry before applying Imprint.

3.2 MILLING THE PAVEMENT

A. In order to achieve an Imprint surface that is level with the surrounding pavement, the pavement will require milling to achieve proper depth level before the application of Imprint.
B. The installation area boundaries shall be sawcut prior to excavating the pavement materials for a clean edge. All pavement materials shall be milled and all excess material removed. The depth of the milled area shall allow the depth of the Imprint material to be maintained within a range of ¾” to 1” depth across the entire installation.
C. The existing pavement must be free of cracks. The milling process will not necessarily remove pavement cracks. If the applicator chooses to overmill cracked areas and reapply a pavement layer, the applicator will need to be certain that the cracks do not reappear as these will reflect through the Imprint surface.

3.3 OVERLAYING PAVEMENT

For overlay installations where the pavement is not to be milled out in its entirety and/or it is desired that the Imprint surface be slightly higher than the surrounding pavement, it will be necessary to ensure a proper transition from the surrounding surface to the Imprint surface.

A. To facilitate this transition, the applicator will install a construction keyway 6” wide x 1” deep by sawcutting and excavating along the boundaries of the finished area. This will allow for a flush clean finish where the two surfaces meet. The applicator shall slope the Imprint up evenly to the proper level ensuring a minimum Imprint depth coverage of between ¾” and 1” across the transition.
B. The overlay coverage of the Imprint material shall be maintained at ¾” to 1” across the entire installation.

3.4 SURFACE PREPARATION

The pavement surface shall be dry and clean: free of all dirt, debris, salts, concrete admixtures and any chemical residues. Bituminous residue must be removed from new HMA pavement surface prior to application of Imprint. Removal of these contaminants may be done by brooming, compressed air, pressure washing or if necessary lightgrit blasting. Wire brush may be used to remove loose or powdery materials.

3.5 INSTALLATION OF IMPRINT

A. Application Temperature Conditions

a. Typical material application temperature: 375°F – 425°F.
b. Road temperature: Minimum 32°F and rising.
c. Maximum safe heating temperature: 450°F

B. Application thickness: Imprint is to be applied at a thickness of ¾” to 1”.
C. Surfaces with a high degree of porosity require a primer before Imprint is installed.
D. The Imprint material shall be prepared for installation utilizing a heating kettle specifically designed for Hot Applied Polymer Modified Synthetic Asphalt Surface Treatment and capable of mixing components to a homogenous consistency. The Material shall be heated within the temperature range of 385 F – 420 F prior to installation.
E. The Hot Applied Polymer Modified Synthetic Asphalt Surface Treatment shall be uniformly distributed onto the pavement surface by means of preheated finishing irons.
F. The heated and mixed material is hand applied over the prepared surface at an average depth of between 3/4” and 1”.
G. Interface with adjacent surfaces shall be flush, providing smooth transition from surface to surface. Precautions to protect the immediate perimeter around the installation are to be taken.
H. Applying the silica cover: Immediately apply the silica cover aggregate at an approximate rate of 1.75 lb/SF. The placement of this material does not require any compaction.
I. Imprinting the pattern design: Stamp the pattern into the semi molten material immediately after the silica aggregate application using an approved mold capable of providing a 5/16” +/1/16” inch deep impression in accordance to the design details shown on the plans and as approved by the owner.
J. Curing Time. Imprint can be open to traffic when the Hot Applied Polymer Modified Synthetic Asphalt Surface Treatment has cooled and hardened. This is typically 1 hour, but depends on the actual ambient conditions. More time may be required in hot weather. After initial set, remove excess aggregate by hand or suction sweeping prior to opening to traffic.

PART 4 – MEASUREMENT AND PAYMENT

4.1 MEASUREMENT

The measured area is the area of Imprint installed, measured in place. No deduction will be made for the area(s) occupied by manholes, inlets, drainage structures, bollards or by any public utility appurtenances within the area.

4.2 PAYMENT

Payment will be full compensation for all work completed as per conditions set out in the contract. For unit price contracts, the payment shall be calculated using the measured area as determined above.

PRODUCT DESCRIPTION:

USES:

The Imprint surfacing system is used extensively on crosswalks, intersections, sidewalks, downtown revitalizations and traffic calming applications. Imprint is a decorative surfacing system that provides a wide range of options where the functional appeal of paver products is a requirement. It is available for use in both highway and pedestrian areas. It is suitable for sites with high numbers of vehicles per day, and is formulated to have very good resistance to rutting and deformation. Imprint is supplied, as a through colored material so surface abrasion will not detract from the overall color of the material. Imprint can be installed with minimum disruption to existing traffic conditions.

• Quick to install, can be open to traffic in under 1 hour even in hot climates

   

• No excavation, applied onto an existing surface at an average thickness of 3/4” thick

   

• Material colored throughout so color does not ‘wear off’

   

• Available in a variety of colors and patterns

   

• Can be applied all year round

   

• Highly durable and proven track record of lasting 10 years in sites with 50,000 plus vehicles per day

   

• High friction surface to reduce slipping

   

• Installed in the United States since 2001 and throughout the world since 1994

   

Application Instructions

Imprint can be applied to bituminous and concrete road surfaces, providing they are free from serious cracks, spalling failure and in stable condition.

Imprint can be installed raised, inlaid or to augment existing traffic calming feature.

Surfaces with a high degree of porosity require a primer before Imprint is installed.

Surfaces that may be subject to movement in vertical or horizontal direction should be avoided, as there may be a risk of reflective cracking through to the Imprint surfacing.

For example, in asphalt surfacing if there is a weakness in the underlying courses and the surface sinks under the action of traffic, this could cause a crack to reflect through the Imprint layer. Movements at construction joints or movements due to interlayer adhesion failure may also cause adverse effects in the Imprint layer.

For concrete surfaces the two common situations to avoid are mid-bay cracking and construction joints. Preferred detail is to lay the Imprint pattern in such a way as to reflect the natural joints of the pattern with the construction joints in the substrate. Any movement that occurs can be accommodated without causing stress in the Imprint surfacing.

A tack coat should be applied to stone rich or polished surfaces and to concrete surfaces for extra adhesion.

PATTERNS

Running Bond Brick, Herringbone (90°& 45°), Cobbles tone, Basketweave and Granite Sett. Other patterns available upon request.

COLORS

Oxide Red, Burnt Red, Reading Red, Brown, Stone, Fawn, Light Gray and Dark Gray.

APPLICATION THICKNESS

Imprint can be applied at thicknesses of ½”on pedestrian areas and up to 1” thick. Average thickness depth ¾”

GRADE SELECTION

Imprint is available in various grades. Grade 45 is typically used in temperate climates. Grade 60 in warm climates.

Other grades are available for very warm climates - grade 70. The resistance to rutting is improved, indicating better resistance to traffic effects.

INDENT PERFORMANCE

Grade 45     Less than 50 dmn at 105°F
Grade 60     Less than 50 dmn at 125°F
Grade 70     Less than 25 dmn at 140°F