New Specs. - Placement. Compacted. Lift Thickness: • Soil, Type 1 Granular, Shale, and Random Material: 6" when compacting with full size compaction equipment • Type 2 Granular: 8" when compacting with full size compaction equipment – Type 2 Granular linked to construction requirements for pavement subbase so as to avoid unnecessary ...
Read More4 Chart 1: Recommended Mixes for Normal HMA Applications (Proposed compaction levels based on NCHRP 9-9 levels @ 4% Per Voids) Low Volume Design Level Recommended Aggregate Size Binder Type Compaction Level Compacted Thickness Surface 9.5mm PG64-22 50 gyrations 1.5" Base 12.5mm PG64-22 50 gyrations 2" 19mm PG64-22 50 gyrations 3"
Read MoreThe compaction process causes the asphalt-concrete mix to be compressed and its volume reduced. As the density of the hot-mix asphalt material increases, the air-void content of the mix decreases (they are inversely proportional to each other). Properly designed, a HMA mix should have an air-void content in the range of 3% to 5%. ...
Read MoreCompaction in the construction operation is most important to the performance of the completed asphalt pavement, regardless of the thickness of the course being placed. Compaction should be accomplished by rolling with an eight to ten (8-10) ton powered steel wheel roller or other equipment capable of producing equivalent density.
Read MoreTypes of compaction There are four types of compaction effort on soil or asphalt: Vibration Impact Kneading Pressure Soil Compaction Soil compaction is defined as the method of mechanically increasing the density of soil. In construction, this is a significant part of the building process. If …
Read MoreAsphalt rubber is specified to include 18 percent to 22 percent crumb rubber modifier (CRM) by total mass of the asphalt rubber blend. The CRM must also include 25 percent, plus or minus 2 percent, high natural rubber content scrap rubber by mass of the CRM …
Read MoreImpact of Changes to Asphalt Specifications Changes made to asphalt mix specifications in 2017 & 2018 are expected to extend pavement service life by 10% based on: •increased compaction of mixes, and •quantity of asphalt cement in 2017 mixes The following other 2017 changes are expected to significantly reduce premature pavement cracking:
Read MoreThe ® CB7 asphalt compactor offers enhancements that simplify operation, provide versatility, and deliver excellent fuel economy. Rotary dials, oscillatory vibration, and 360º seating make this compactor a perfect match for urban streets, highways, and other intermediate-type applications.
Read MoreWe have 3-5% AV at Marshall, 65-75 VFB (VFA) also in specs. We also have 4.5% minimum asphalt and our coarse aggregate has SG of 3. So, at primary compaction he is packing it down to about 4% AV so with secondary compaction, this will drop to below 2% in some cases.
Read MoreConstruction Specifications for Asphalt Concrete, by The Asphalt Institute. Mix Design Methods for Asphalt Concrete, by The Asphalt Institute. ... Division 40 – Asphalt Surfacing Revised 11/08 The number of blows of the Compaction hammer used in the Marshall Mix Design will be fifty (50) blows per side of specimen.
Read MoreMike Anderson, Director of Research for the Asphalt Institute, estimates "on a typical six-lane interstate with a ten-year rehabilitation cycle, compaction specification changes can yield a 3 to 5 percent decrease in the life-cycle cost of pavement rehabilitation." Here is an illustration from an Asphalt Institute lab compaction study:
Read MoreCompaction is the process of reducing the volume of material by compression. In asphalt paving, this is achieved by. the types of rollers, number of rollers, the rolling patterns, and the material placement temperatures. Properly compacting hot-mix asphalt will result in approximately 25% (1/4-inch per I-inch) reduction in the material thickness.
Read MoreThe Asphalt Concrete Paving equipment, weather limitations, jobmix formula, mixing, construction methods, compaction, finishing, tolerance, and protection shall conform to the requirements of the appropriate sections of the State Highway Specifications for the type of material specified.
Read MoreAsphalt Concrete • Section 719: Polymer Modified Asphalt Concrete Specifications rewritten, or with major updates: • Section 106: Control of Materials • Section 309: Lime Stabilization or Modification of Subgrade • Section 340: Concrete Curb, Gutter, Sidewalk, Curb Ramps, Driveway and Alley Entrance • Section 710: Asphalt Concrete
Read MoreF. "Relative compaction" is the ratio, expressed as a percentage, of the inplace dry density to the laboratory maximum dry density. G. Compaction shall be deemed to comply with the Specifications when no more than one test of any three consecutive tests falls below the specified relative compaction…
Read MoreThe goal in compacting an asphalt mix is to produce a smooth, stable and durable asphalt pavement. Understanding the factors affecting compaction is an important step in achieving this goal. Jim Scherocman is a consulting engineer specializing in asphalt pavement design and construction. He can be reached at (513) 489-3338.
Read MoreWhile there are an infinite number of questions that can be asked, we compiled a list of those questions that have been directed to us the most. These FAQs are categorized into subject areas listed in the contents drop-down box below. We tried to keep both the questions and answers concise. Additional information is referenced … Continue reading Asphalt Pavement Construction
Read More2. Under area paving – one test every 2000 ft² (180 m²) of each lift. 3. Road base and sub-base – one test every 2000 ft² (180 m²) of base or sub-base. 4. Backfill of trenches – one test for every 50 linear ft (15 m) of each lift. 5. General fill – one test every 5000 ft² (460 m²) of each lift. As a minimum, at least one in-place ...
Read MoreASPHALT PAVING RELEASE - 2.0 SECTION 32 12 16 BART FACILITIES STANDARDS Issued: 09/30/2008 STANDARD SPECIFICATIONS B. Base course shall be minimum uniform thickness after compaction of dimensions indicated.
Read MorePG 76-22 is a polymer modified asphalt cement and is normally used for high traffic areas. The list of qualified bituminous materials is QPL-7. The type of asphalt binder for each mix will be included on the approved GDOT Job Mix Formula for each type of mix. Specifications for asphalt cement are located in Section 820 of the GDOT Specifications.
Read More12. Discuss compaction patterns and equipment to be used to determine patterns. Who will be in control of compaction, paving foreman or density gauge operator? Compaction should always progress from the low side to the high side. A discussion of the tender …
Read More501-B Field Compaction Report . 501.01 SCOPE . This specification covers the requirements for compaction of earth and granular materials. 501.01.01 Specification Significance and Use . This specification has been developed for use in provincial- and municipal-oriented Contracts. The
Read MoreIn asphalt pavement construction, it's "compaction, compaction, compaction." In this edition of the RoadReady newsletter, we will focus on measuring the density of a pavement and therefore how well it was compacted, as well as examining the challenges around to obtaining proper compaction.
Read More2.1 This procedure is applicable for all items of hot-mix asphalt pavements requiring compaction testing. 3.0 DEFINITIONS 3.1 Quality ControlTesting – Testing conducted by the Contractor to monitor and control the production of their product. 3.2 Verification Testing – Testing conducted by the Division to determine specification compliance.
Read MorePage 3 of 40 If adding a liquid anti-strip additive to the asphalt binder, complete blending before mixing the asphalt binder with the aggregate. Only use liquid anti-strip additives that ensure the asphalt binder meets the Performance Grade (PG) requirements in 3151. The Contractor may use asphalt binder with liquid anti-strip added
Read MorePerformance Related Specifications Developments. HMAT, vol. 6, no. 3. National Asphalt Pavement Association (NAPA). Landham, MD. (third in a series of 3 articles) Muench, S.T. and Mahoney, J.P. (2001). A Quantification and Evaluation of WSDOT's Hot Mix Asphalt Concrete Statistical Acceptance Specification. WA-RD 517.1.
Read MoreThe compaction of asphalt concrete mixes is currently governed by one of two types of specifications. A method specification is used for some asphalt concrete (301, 302, and 448 by 2005 specification and older), while most mix types (446 and 448 by 2008 specification and newer) are governed by a density requirement ( 446.05 and 448.03 ).
Read More461 Compaction and Density of Asphalt Pavement 461.1 General Compaction of the asphaltic pavement or surface is geared to achieving the required density and ride qualities. The contractor is responsible for mixture design, quality control of the production of the mix, and attainment of required pavement density.
Read MoreRoad Standards and Paving Standards. ASTM's road and paving standards provide the specifications and test methods pertinent to the material, physical, mechanical, performance, and application requirements of road surfaces and pavements. These geotechnical surfaces are laid down on specified areas intended to sustain either or both foot and ...
Read MoreSPECIFICATIONS FOR ASPHALT PAVING, MATERIALS, SAMPLING, AND TESTING Public Works Department Page 1 1.0 GENERAL This specification covers asphalt to be used for the construction of roads, laneways, parking lots, and bikepaths. Unless otherwise specified in the contract documents, or
Read Moreamplitude setting that is ideal for thin-layer asphalt compaction at faster speeds. Thinner layers of asphalt tend to cool quicker and use smaller aggregates that can be crushed if too much force is applied. This option increases the versatility of the DV209D and DV210D by increasing the range of applications and asphalt mixes
Read MorePOLITICIZE is a leading and pioneering enterprise with the most advanced international level in R&D, manufacturing and selling of large-scale crushing & screening plants,industrial milling equipments and beneficiation plants. All of our equipment have got ISO international quality system certification.
Read More
Tel: 0086-21-58386256
E-mail: [email protected]
Fax: 0086-21-58385887
Add: No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
