Arkemaroad science strata reflective crack relief interlayer. Hot mix asphalt hma applied over concrete pavements has always been a challenge as the joints of the concrete pavement cause. Reflective crack relief system was designed and marketed by koch pavement solutions. They strengthen the pavement structure, reduce roughness and restore skid resistance. However, existing cracks in the pavement begin to appear in the new surface within one or two years. The crack relief interlayer is an asphalt rich, highly flexible hma that can resist cracking in high strain loading conditions. Reflective crack relief interlayers petersen asphalt research.
Hot mix asphalt hma applied over concrete pavements has always been a challenge as the joints of the concrete pavement cause cracking that quickly reflect. Description this work shall consist of developing reflective crack relief hma interlayer material using the. Some people think that reflective cracks only form in asphalt overlays over rigid. This specification is new york state department of.
Reflective cracking relief interlayer for asphalt pavement. Mirafi mpv nonwoven asphalt overlay fabric forms a membrane that minimizes surface water from penetrating pavement systems and provides a stress relief interlayer which inhibits the growth of reflective cracks. It is thought that this interlayer will cause the overlay to behave independently from the underlying structure. Cost effective prevention of reflective cracking in composite pavements. The main role of the sami is to retard crack propagation and improve the tensile strength at the bottom of the overlay due to the presence of the rubber asphalt binder. Asphalt institute international association of petroleum asphalt producers, manufacturers, and. Literature from semmaterials suggests that the strata reflective crack relief system can provide several advantages. Quikjoint is an innovative rollout cold applied asphalt crack repair tape that creates a durable, watertight and elastic seal after being heatbonded to the pavement surface.
Hot mix asphalt hma applied over concrete pavements has always been a challenge as the joints of the concrete pavement cause cracking that quickly reflect upward through the new hma overlay to the surface. Evaluation of strata reflective crack relief system. Proceedings of the 4th international rilem conference, 2630 march 2000, ottawa, canada. Reflective cracking in asphalt pavements generally occurs over the joints of underlying concrete slabs or cracks in cement bound base layers. Assessment of asphalt interlayer designed on jointed. Rehab pavement preservation timing curve shape determined by quality, traffic, x climate, etc. Ace xp polymer fiber is used in a special asphalt mix design to create this reflective crack relief interlayer product called armi ace xp polymer fiber when added to typical base and surface asphalt pavements has shown to improve crack resistance from 25% to 60%. Joint reflective cracking on a lowuse industrial road.
These include unbound relief layers, interlayers, geosynthetic fabrics, and highly specialized asphalt mixtures these techniques can impede the reflection of cracks by minimizing the tension transferred to the overlay. Introducing armi surface techs new reflective crack. The most common type of pavement deterioration is reflective cracking which occurs when a crack in an overlay layer reflect the pattern of cracks and joints of the old pavement underneath it. Hot mix asphalt hma overlays are the traditional method for protecting deteriorating pavements. Crack reducing interlayer building materials and asphalt. Many agencies place hotmix asphalt overlays on deteriorating jointed or cracked portland cement concrete pavements to improve the ride, protect the pavement structure, and reduce noise. Deep strength flexible pavementsflexible pavements that consist of a relatively thick hma surface and a densegraded hma or asphalt. Introducing armi surface techs new reflective crack relief.
Some or all of the existing asphalt is reworked to remove the old crack. Mitigates and slows reflective cracking from both existing underlying courses and thermally induced cracking. Road science answers the need for protecting overlaid pavements with a strain tolerant reflective crack relief interlayer, designed to be impermeable and flexible, preventing moisture from infiltrating the pavement and significantly delaying reflective cracking in the overlay. Special specification 3017 reflective crack relief interlayer. This design procedure includes preparing one or more bituminous mixture test specimens, measuring the performance of these specimens, and selecting a desirable bituminous mixture for paving that is vaporpermeable based on the performance of the specimens. Reflective crack relief interlayers by bill buttlar university of illinois at urbanachampaign. Reflection cracking of the joints and preexisting cracks through the overlay is a persistent problem. The treatment strategy consists of placing a paving fabric on an existing pavement, which should be structurally sound, followed by a single or double chip seal.
Cost effective prevention of reflective cracking in composite pavements rakesh bandaru. Armi aramid reinforced membrane interlayer surface tech. A typical treatment for restoring deteriorating portland cement concrete pcc and asphalt concrete ac pavements is the use of hot mix asphalt hma overlays. Armi aramid reinforced membrane interlayer takes asphalt pavement crack resistance to the next level, providing a permanent plant produced and paver laid 1 thick asphalt interlayer.
Cost effective prevention of reflective cracking in. This mission is achieved through collaboration of leading experts in construction practice and science including academics, researchers, industrialists, testing. Special specification 3305 reflective crack relief. Produced from polypropylene staple fibers, tencate mirafimpvcs is heatset to provide a waterproofing barrier. Controlling reflection cracking in hma overlays of pcc pavement. Reflective cracking relief interlayer hot mix asphalt hma applied over concrete pavements has always been a challenge as the joints of the concrete pavement cause cracking that quickly reflect upward through the new hma overlay to the surface. Selfadhering waterproofing and crack relief membrane. Reflective cracking of flexible pavements phase i and ii. Special specification 3305 reflective crack relief interlayer. Thicker overlays allow the stresses to dissipate and may reduce the crack width or severity. Pcc is a rigid pavement while hot mix asphalt hma is a flexible pavement. Minimizing reflective cracking in cementstabilized. Pg6722 is the most commonly used type of asphalt cement in georgia for hma.
Crack relief layer crl is a layer that is placed between the new overlay and the old pavement in order to dissipate pavement movements before they. May 04, 2010 a highly strain tolerant, substantially moisture impermeable, reflective crack relief interlayer is provided. Reflective cracking relief interlayer for composite. Although there are many techniques to delay crack propagation through an asphalt overlay, they may require specialized equipment, unique mix designs, or other specific mixture additives. Special specification 3017 reflective crack relief. Aramid reinforced mix interlayer armi provides 7x greater crack.
Hot mix asphalt hma applied over concrete pavements has always been a challenge as the. Quik joint 2 inch asphalt crack repair tape for sale. Controlling reflection cracking in hma overlays of pcc pavement gary l. Table 2 asphaltic concrete open graded crack relief interlayer mixture design and control sieve size mixture control tolerance, % design gradation limits, % passing open graded crack relief interlayer 34 in 19 mm sieve 0. The type of bituminous material used in the production of hma in georgia is asphalt cement, grades pg6422, pg6722 and pg7622. State materials office florida department of transportation. A highly strain tolerant, substantially moisture impermeable, reflective crack relief interlayer is provided. The significance and effectiveness of implementing crl into pavement layers to prevent reflective. Oct 31, 2019 arkemaroad science strata reflective crack relief interlayer. This mismatch of modulus strengths results in cracks forming in the hma as a result of the underlying concrete pavement joints. A typical treatment for restoring deteriorating portland cement concrete pcc and asphalt concrete ac pavements is the use.
Ultrathin bonded inplace recycling reflective crack relief system base stabilization. It can also be caused by the expansion, contraction and bending from thermally induced movement of the substrate or by traffic induced shearing, and in widening schemes by differential settlement where. Technical guide aaptp 0504 techniques for mitigation of. Stress relief for asphalt pavements premature reflective cracking in new asphalt overlays is a global problem for pavement design and maintenance engineers. Assessment of asphalt interlayer designed on jointed concrete. Stress concentrations at pavement joints or cracks are a primary factor in the deterioration of the overlay and the propagation of pavement faults. Reflective cracks are more than an aesthetic concern. Tencate miraif mpvcs nonwoven asphalt overlay fabric with chip sealsforms a membrane that minimizes surface water from penetrating pavement systems and provides a stress relief interlayer which inhibits the growth of reflective cracks. The international union of laboratories and experts in construction materials, systems and structures rilem was founded with the aim to promote scientific cooperation in the area of construction materials and structures worldwide. Reflective crack relief asphalt interlayer blankenship. For severe asphalt cracking or asphalt overlays over portland cement concrete pcc, surface tech has succeeded in developing a revolutionary new solution that vastly improves crack resistance. The crackrelief interlayer is an asphaltrich, highly flexible hma that can resist cracking in high strain loading conditions. Our product mirafi mtk peel and stick membrane is engineered with an impervious modified asphalt. Aramid reinforced mix interlayer armi provides 7x greater crack resistance as compared to standard asphalt mixes.
Controlling reflection cracking in hma overlays of pcc. They are caused by vertical or horizontal movement in the pavement beneath the overlay. Special specification 3305 reflective crack relief interlayer rcri 1. This section of highway is one of kentuckys more heavily loaded pavements with nearly 40million equivalent single axle loads esals. Reflective cracking is one of the major type of distresses associated with the use of asphalt concrete ac overlay for rehabilitating deteriorated. Armi armi aramid reinforced membrane interlayer takes asphalt pavement crack resistance to the next level, providing a permanent plant produced and paver laid 1 thick asphalt interlayer.
This layer may be used as a stressrelief interlayer. Strategies depend upon the severity and extent of the cracking. Average 69% improvement in reflective cracking on reflective crack relief system projects avg. Use of asphalt crack relief layer in airport pavements. It is designed to have a high volume of asphalt with a low percentage of air voids and to contain a polymer modified binder with a wide temperature performance grade range. Joint reflection cracking washington asphalt pavement. Research project title assessment of asphalt interlayer designed on jointed concrete sponsors iowa department of transportation intrans project 475 federal highway administration principal. Mitigation strategies for reflection cracking in rehabilitated.
Minimizing reflective cracking in cementstabilized pavement. Reflective crack relief pavement interlayer with improved. Pg 7622 is a polymer modified asphalt cement and is normally used for high traffic areas. Produced from polypropylene staple fibers, mirafi mpv is heatset to provide a waterproofing barrier. This document is available to the public through the national technical information service, springfield, virginia 22161. Mirafi mtk paving fabric is adhered to an impervious modified asphalt membrane specifically designed to function as a crack relief layer and moisture barrier on pavements on existing roadways, bridge decks, airport runways and taxiways. Provide a rcri meeting the requirements for asphaltic concrete defined in the items densegraded hotmix asphalt method and densegraded hotmix asphalt qcqa, except as.
The cracks are commonly called, reflective cracks or reflective cracking as shown in figure 1. The cracks occur directly over the underlying rigid pavement joints. Introducing armi surface techs new reflective crack relief interlayer by dylan berkley asphalt, armi 0 comments for severe asphalt cracking or asphalt overlays over portland cement concrete pcc, surface tech has succeeded in developing a revolutionary new. Open graded crack relief layer and asphalt rubber membrane interlayer to mitigate reflective cracking gadsden county, state road 10us90, sectionsubsection 50000 the objective of this project is to evaluate the relative effectiveness of alternative design methods to prevent or delay relative cracking in asphalt pavements. Overlays are needed to protect the existing pavement structure and provide a new. Gdot specification section 415 what it looks like what it looks like in real life. Reflective cracking in asphalt overlays placed over jointed concrete pavement has been a concern of the virginia department of transportation vdot for years. The sami effect can also reduce strain in the overlay. The materials and composition for reflective crack relief interlayer mixtures shall meet the requirements specified in 4012 and 4022, except as noted herein.
The cracks occur directly over the underlying cracks or joints. Field engineer asphalt institute san antonio, texas. For joint reflection cracking, this is movement of the pcc slab beneath the hma surface because of thermal and moisture changes. The only way to be sure a crack in the surface of an asphalt pavement is reflecting a crack in the stabilized base layer below is to take a pavement core and visually see the crack in the same location in the base and asphalt layers. However, since semmaterials is the current owner of strata technology, all references in this report will be to them. Asphalt overlays are an attractive rehabilitation alternative. Its speciallyblended, hightack rubberized asphalt compound is compatible with all. In this process, the crack location is identified and a sawcut is made to form a clean opening which can be. Cracks in a flexible overlay over an existing crack or joint.
Reflective cracking in pavementsresearch in practice. The standard armi product will drastically reduce both bottom up and top down crack penetration through the 1 thick interlayer providing. Test sections were constructed in racine county in 2001 and in st. Near the asphalt institutes headquarters in lexington, kentucky, a fivemile reflective crack relief interlayer was placed on i75i64. The interlayer mix is designed using a fatigue test and a stability test. Wisconsin experiences with reflective crack relief projects. John cheever, semmaterials nicola upright, colorado. Joint reflection cracking does not include reflection cracks that occur away from an underlying joint or from any other type of base e. Produce reflective crack relief hma interlayer mixture in accordance with the procedures.
Produce and place a reflective crack relief bituminous interlayer rcri in one lift 1 in. Evaluation of highly polymer modified asphalt mixtures. Strata reflective crack relief system petersen asphalt research. Rapid placement economical excellent smoothness, skid resistance, markings contrast asphalt overlay life is often cut short due to reflective cracking some interlayer treatments show promise, but difficult to predict, esp. Reflective crack relief interlayers by bill buttlar university of illinois at urbanachampaign cracking in pavements symposium laramie, wy july 19, 2007. This item shall govern for the materials and construction requirements for producing and placing a reflective crack relief bituminous interlayer rcri to be placed in one lift 1 inch in thickness in conformance with the lines, grades, and typical cross. Generally not load initiated, however loading can hasten deterioration. This layer may be used as a stress relief interlayer. The utah dot specifies a reflective cracking relief bituminous mixture which meets the general requirements specified for an hma mixture except the mix is designed to a target air void of 0. Reflective cracking relief interlayer for composite pavements.
148 457 1385 916 1295 755 1317 455 1325 1007 1008 1347 25 358 290 1258 946 1177 348 590 227 352 21 1488 596 1061 403 160 721 239 211 440