The compactor is an electrohydraulic or electromechanical compactor with a ram and ram heads that are restrained from revolving during compaction. Mix designs were conducted with the superpave gyratory compactor for two types of. When using the superpave gyratory compactor sgc for preparing hotmix asphalt hma specimens during the mixture design andor qaqc processes, it is vital to minimize variability in the bulk specific gravity gmb of the specimens both in terms of repeatability the ability of. The superpave gyratory compactor establishes three different gyration numbers. Servo controlled superpave gyratory compactor grc 20 selfheating molds for 4 and 6 diameter hot mix asphalt hma specimens.
The model 5850 meets or exceeds all federal highway administration fhwa superpave specifications. Oklahoma highway construction materials technician certification board instructional video. Cominsky university of texas at austin with contributions by. Superpave gyratory compactor sgc, these external sources of variability. May 01, 2007 this study on the angle of gyration for superpave compactors was done to determine if there is a difference in the bulk specific gravity gmb and ultimately the volumetric properties when calibrating the compactors angle of gyration internally and externally. Pdf the effect of restricted zone on volumetric properties of mixes. Develop mix design method using the superpave gyratory compactor sgc a develop guidelines for the use of sgc for preparation of samples for mix design bdetermine compactive effort in terms of gyration number for selection of optimum additive content. The superpave mix design manual for new construction and overlays. Using the sgc to compact soil is attractive because the gyratory compaction process simulates field compaction more closely than traditional impact compaction tests, and the gyratory compactor has an established track record of success with asphalt compaction. Closedloop servo control of ram pressure and tilt angle. The primary operating parameters for the sgc include the pressure. Superpave gyratory method washington asphalt pavement.
When your asphalt is on the line, you can count on pine. Application of discrete element method to superpave gyratory. National cooperative highway research program transportation research board. Background the superpave mix design procedure features the superpave gyratory compactor sgc for compacting specimens of hot mix asphalt. Research superpave gyratory compactor internal angle of. Apparatus superpave gyratory compactor, approved list device calibration settings verified on 1 m o. Pdf evaluation of superpave gyratory compaction of hot. Instead of the impact of weighted hammer blows, the superpave gyratory compactor sgc uses a hydraulically powered kneading system with an action much closer to actual field densification of the mix. Jun 04, 20 superpave gyratory compactor by james cox and sons conforms to astm d6307, aashto t312 tp4, shrp m002, en 1269710, en 1269731, t 07362011.
Ray brown, and mike huner introduction background the superpave gyratory compactor sgc was developed during the strategic highway research program as part of the superpave mix design system to better simulate the field. The superpave mix design manual for new construction and overlays ronald j. The number of gyrations used as a measure of mixture compactability during construction. Prepare 6 initial samples, two at the proposed design asphalt content, two at 0. Evaluation of the internal angle of gyration of superpave gyratory compactors in alabama brian d. Astm standards astm d6931 standard test method for indirect tensile idt strength of asphalt mixtures astm d8225 determination of cracking tolerance index of asphalt mixture using the indirect tensile cracking test at intermediate temperature. Superpave gyratory compactors this technical brief provides an overview of the gyratory issues that affects the performance of asphalt pavements. Brovold superpave gyratory compactor or approved equal. Superpave gyratory compactor figure 1, including a device for measuring and recording the height of the specimen throughout the compaction process.
The compactor may also include a printer or a computer and software for collecting and printing the data. In the superpave method, this step can be broken up into 4 substeps. Effect of density on mechanical properties and durability of roller compacted concrete by nader amer, christopher storey, and norbert j. D692515 standard test method for preparation and determination of the relative density of asphalt mix specimens by means of the superpave gyratory compactor relative density compaction cylindrical specimens pavements superpave gyratory compactors asphalt. Gyratory compactor an overview sciencedirect topics. A method was developed to identify unstable mixes with the help of superpave gyratory data. Sgc is an important component of the superpave mix design method. Wsdot errata to fop for aashto t 312 asphalt mixture specimens by means of the superpave gyratory compactor waqtc fop for aashto t 312 has been adopted by wsdot with the following changes. Determination of ndesign for cir mixtures using the superpave gyratory compactor final report by stephen a. The basis of this method is that the primary difference in behavior of a stable mix and an unstable mix i. It was found that 41 percent of the compactors tested were not in specification when. Afg2 superpave gyratory compactor operation manual pine. The model 5850v2 is troxlers newest superpave gyratory compactor and the most advanced, easiest to use gyratory compactor on the market today. Pdf evaluation of superpave gyratory compaction of hot mix.
The afg2 is designed to compact asphalt specimens at a constant consolidation pressure, a constant angle of gyration, and a fixed speed of gyration in compliance with. Discrete element modeling for the superpave gyratory. Design of txdot asphalt mixtures using the superpave gyratory. Superpave gyratory compacting of test specimens of bituminous. Scope the department requests a gyratory compactor that compacts hot mix asphalt specimens at constant pressure, a constant angle of gyration and a fixed speed of gyration.
Introduction over the past 26 years, many roller compacted concrete rcc pavement projects have been constructed in north america. Superpave gyratory compactor sgc to analyze if sgc compaction enables improved precision of compressive strength tests for flexible base and subgrade materials and analyzed a procedure for determining the moisturedensity curve of base and subgrade materials using the sgc. The pine 125x and g1 superpave gyratory compactor compacts asphalt specimens for asphalt mix testing according to aashto t312. The data can be depicted as gyratory shear force vs. Laboratory testing of soil using the superpave gyratory compactor. Way more information than you ever wanted on how to fell a tree. Compact these trial mixes in the superpave gyratory compactor figures 1, 2 and 3. Superpave mix design and gyratory compaction levels. Astm d6925 15 standard test method for preparation and. Associate professor university of kansas a report on research sponsored by the recycled materials resource center fhwa agreement no. While the primary purpose of sgc is to compact test specimens, it can provide valuable information about the compact ibility of the particular mixture by capturing. Triplicate samples of hotmix asphalt hma were used for each compactor.
Continuous positive feedback to maintain gyration angle precision throughout compaction. Specimens by means of the superpave gyratory compactor 2. In addition the newdesign system introduced aggregate and binder requirements andmixture compactive effort tied to traffic. Pine g2 superpave gyratory compactor for asphalt testing. Development of superpave mix design procedure gyratory compactor experiments conducted at asphalt institute included rotational speed, n design, sensitivity experiments comparison between prototype and production sgc led to discovery of angle sensitivity tolerance of 0. Compacting bituminous specimens using the superpave gyratory. It is assumed that the reader of this manual is already familiar with hot mix asphalt design and general issues pertaining to gyratory compaction. Pine 125x and g1 superpave gyratory compactors for asphalt. Use of superpave gyratory compactor to characterize hotmix. Laboratory compaction is accomplished using a superpave gyratory compactor sgc. Completely redesigned with improved electronics, a hydraulic motor, and softwareadjustable angle of gyration, the durable 5850 will consistently stand up to the rigors of any asphalt lab. The hm685s superpave gyratory compactor wshear measurement is an identical model, factoryequipped to measure and graph gyratory shear, the force required to gyrate the specimen. It is a high quality machine with which the user can.
The troxler model 5850 superpave gyratory compactor provides compaction of asphalt specimens at a given pressure, angle, and number of gyrations. Everything you ever wanted to know about hma in 30 minutes. Currentlythe superpave mixture design system is the predominately usedsystem in the us. Nchrp report 478 relationship of superpave gyratory. Evaluation of the superpave gyratory compaction procedure final report prepared for. The superpave system ties asphalt binder and aggregate selection into the mix design process, and considers traffic and climate as well. Servo controlled superpave gyratory compactor grc20. The optimum bitumen contents obc were determined using aashtot31211 procedure, while the mixture test samples were compacted using superpave gyratory compactor. Evaluation of superpave gyratory compaction of hot mix asphalt. Preheat molds and plates in the oven set no more than 25 f above the compaction.
Superpave gyratory compactors fhwa us department of. Application of superpave gyratory compactors for flexible. The objective of this study is to analyze the movement characteristic of differentlyshaped compositions in the superpave gyratory compactor sgc test through tracking coarse aggregates and the. Mixing and compaction temperatures are chosen according to asphalt binder properties so that compaction occurs at the same viscosity level for different mixes.
Determine proper curing procedure before compaction, and after compaction and before. Compacting bituminous specimens using the superpave. Rcc has proven to be a reliable, economical, durable. The g2 is a customer favorite because it is userfriendly, reliable, durable, and well supported. Compared to the marshall design method, superpave integrates material selection and mix design and uses an entirely different type of compaction. Two new key features in the superpave system are laboratory compaction and mixture performance tes ting. Effect of density on mechanical properties and durability of. This manual describes the proper use of the pine afg2 superpave gyratory compactor sgc, including operating instructions, periodic maintenance, standardization procedures, and safety issues.
The aggregates were 24 h oven dried prior to sieving, after which it was sieved based on selected gradation arrangement. The compaction devices from the hveem and marshall procedures have been replaced by a gyratory compactor and the compaction effort in mix design is tied to expected traffic. Kennedy university of texas at austin michael anderson the asphalt institute strategic highway research program national research council washington, dc 1994. The model 5850 gyratory compactor provides safe, reliable.
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