HOT MIX ASPHALT, HMA, PAVEMENT 401.01 Description This work shall consist of one or more courses of QC/QA HMA base, intermediate, or surface mixtures constructed on prepared foundations in accordance with 105.03. 401.02 Quality Control 10 The HMA shall be supplied from a certified HMA plant in accordance with
The Ronan X96S Series Density System from HMA INSTRUMENTATION is designed to deliver outstanding performance in a wide range of difficult applications and process conditions. The system utilises a single computer that is compatible with all Ronan detectors. This is easily expandable to measure the most complex processes accurately. Intelligent Compaction rollers are used in compaction of hot mix asphalt for breakdown and intermediate compaction for method compaction process and for density required HMA. The current nssp 39-8 requires use of steel drum vibratory roller equipped with GPS, temperature sensor, accelerometer data acquisition system and displays. 2020 HMA Density Testing Inspector Certification Registration Form Alfred State College • Center for Community Education and Training • Phone 607-587-4015 • Fax 607-587-3295 • ccet@alfredstate.edu Program Information In order to provide the highest level of quality for transportation facilities, Density Weighing Table Complete $ 1,210.99 HMA's 30 Gallon Density Bath Combo $ 339.00 15-Gallon Space-Saver Water Bath $ 193.99 Density Weighing Cradles - Available in 3 Sizes - Please Select Size from $ 35.99 This procedure includes methods for determining the in-place density of the Hot Mix Asphalt (HMA) pavements constructed under 50, 60 and 70 Series compaction specifications. This procedure includes: 1. Selection of pavement core samples 2. Selection of density gauge test locations for 60 and 70 Series compaction specifications 3. term durability of a longitudinal joint as the density achieved along that joint. Equally,e th most difficult condition to achieve high density in HMA paving is also along a longitudinal joint in an asphalt pavement. Consequently deterioration of longitudinal joints in HMA is one of the major distresses facing agencies.
Added density for Trench Foundation. 7/29/2011 Revised Added english HMA densities for Scott County and District 6. 8/31/2010 Revised Changed Rip-Rap as Revetment per the Standard Specifications for Highway and Bridge Construction. 4/15/2010 Revised update reinforcing bar density 10/30/2009 Revised Added reinforcing bar information
Density is the weight of material per volume. For example pounds per cubic foot. The density of asphalt pavement mixtures does vary depending on mix proportions and the type of aggregate. If you do not know the in-place density of mixes, you must ask your supplier. Anchor: #i1013899 Section 6: Hot-Mix Asphalt Pavement Mixtures Anchor: #i1013905 6.1 General. Hot-mix asphalt (HMA) is a generic term that includes many different types of mixtures of aggregate and asphalt cement (binder) produced at elevated temperatures (generally between 300-350ºF) in an asphalt plant. Once Gmm is known, portable non-destructive devices can be used to measure HMA density in-place. The terms “percent air voids” and “density” are often used interchangeably. Although this is not wrong, since density is used to calculate percent air voids, the fundamental parameter of concern is always percent air voids. Compaction is the process by which the volume of air in an HMA mixture is reduced by using external forces to reorient the constituent aggregate particles into a more closely spaced arrangement. This reduction of air volume in a mixture produces a corresponding increase in HMA density (Roberts et al.,1996).
simulate the in-place density of HMA after it has endured several years of traffic in the roadway. In-place Density Air Voids ≈20-25% Before Rolling 6 - 7 % After Rolling Future Traffic Lab-Molded Density Air Voids 3.5% Lab
This four-day course is designed for technicians and their supervisors who have responsibility for the density control on soil subgrade and aggregate bases. The course introduces the theory of compaction on various materials, and provides training using MDOT density control tests, procedures and Electric density gauges are relatively new on the market (in the last five years). Accurate calibration of these devices is essential for their proper use. Although percent air voids is the HMA characteristic of interest, measurements are usually reported as a measured density in relation to a reference density. another method of recycling existing HMA and concrete surfaces by utilizing existing material and increasing the load carrying capacity of the resulting new pavement. 5. DENSITY Density is a ratio expressed by the formula D=W / V or density equals the weight of material divided by the volume it occupies. A simple example is the density of water.