Asphalt Density Testing
Asphalt Density Testing: Nondestructive Pavement Evaluation
Transportation departments and contractors require a non-destructive method to evaluate new pavement that is safe and accurate. PaveScan RDM is a groundbreaking new technology that uses ultra-wideband technology to identify areas of non-uniformity in new pavement.
The onsite screen shot shows compaction information and coring locations. The black dots are suggested coring locations and the green lines are indicating that the asphalt is very uniform. This data is a heat map and line chart combination and was taken with a three sensor PaveScan RDM system.
Asphalt Density Testing: Measure Uniformity
PaveScan automatically calculates the electrical properties of new pavement, the dielectric value is a measure relative to the asphalt mix. It will identify the outliers and anomalies, allowing users to determine the conformity of new pavements and appropriate areas to core.
The onsite screen shot shows compaction information and coring locations. This histogram on the bottom shows percentage of uniformity throughout the data collection. This data represented in the histogram and the line chart were collected with a three-sensor PaveScan RDM system.
Asphalt Density Testing: Map Percent Void Data
PaveScan provides users a full coverage survey method to determine asphalt integrity by correlating percent voids with density. To map the percent void content, users first determine areas to core using the dielectric measurements.
After the cores are evaluated, the percent void content can be back-calculated for the survey area and displayed on the PaveScan system, or output via a .csv file.
This Google Earth image shows compaction of pavement using the GPS provided with PaveScan RDM. The green color is representative of pavement uniformity, the spots of yellow represents slightly lower compaction.
Road Inspection: Asphalt Thickness
GSSI’s RoadScan system uses air-launched horn antennas, providing a method for data collection at highway speeds and eliminating the need for lane closures. It is now possible for transportation professionals to collect hundreds of miles of pavement layer thickness data in one day.
This data illustrates variable asphalt thickness over 10th of a mile. The red line illustrates the bottom of the asphalt. This data image was created using the auto-pick layer feature in the RADAN 7 RoadScan module.
Road Inspection: Integrate GPR into FWD
GSSI collaborates with leading falling weight deflectometer (FWD) companies, such as JILS and Dynatest to meet the needs of transportation professionals.
GPR data set illustrates two layers of asphalt (2” and 1.75”) on top of 6 inches of concrete. This information is used to back calculate the layer thickness for FWD measurements.
Road Inspection: Evaluate Base and Sub-Base Layers
Ground penetrating radar provides engineers and transportation departments with an effective tool for evaluating base and sub-base layers with data collection densities not obtainable by other labor-intensive methods, such as coring.
This data illustrates a horn antenna that shows multiple asphalt and sub base layers.
Road Inspection: Locate Voids in Roadways
Construction professionals, engineers and transportation departments can identify and delineate voids under the surface with ground penetrating radar (GPR).
This data image illustrates concrete roadway with a void located just under a concrete slab.
Bridge Inspection: Condition Assessment
Engineers and transportation professionals need a reliable method to collect quantitative data on bridge decks. GSSI’s BridgeScan is designed for bridge condition assessment, providing an accurate representation of the bridge data by automatically accommodating for bridge skew angle.
This color coded deterioration contour map is showing bridge deterioration that is highlighted by red areas.
Bridge Inspection: Assess Concrete Cover
Engineers use concrete cover information to determine if reinforcement bars are protected from environmental effects. Transportation infrastructure professionals use BridgeScan to identify areas in which the cover is non-compliant.
This bridge data set imported into RADAN 7 for additional post processing. The red dots indicate the depth of rebar and horizontal positioning.
Bridge Inspection: Measure Bridge Deck Thickness
Ground penetrating radar (GPR) provides a nondestructive technique for transportation professionals in evaluating bridge deck thickness. GPR can obtain reliable thickness measurements in minutes and eliminate the need to core.
This 2D data set was collected on a bridge deck and imported into RADAN 7 for additional post-processing. The red line denotes the bottom of the bridge deck.
Bridge Inspection: Concrete Inspection of Bridge Structures
Use ground penetrating radar to locate embedment within concrete structures, such as bridge piers or supporting structure of bridge decks, prior to cutting or coring. Collect quantifiable data on rebar location and areas of delamination.
This 2D data set is of vertical concrete support structure of a bridge.