When planning pavement rehabilitation in Corona, we follow ASTM D4694-09 for falling weight deflectometer testing and ASTM D1196 for plate load tests. The city's location in Riverside County places it in a seismic zone with clayey soils from the Santa Ana River basin, so we also evaluate subgrade support under wet conditions. A thorough existing pavement evaluation in Corona California must account for traffic loading from the 91 freeway corridor and the seasonal wet-dry cycles that cause differential settlement. We complement each assessment with a granulometría analysis to verify base course gradation and ensayo proctor compaction data to confirm in-situ density against original specifications.
We backcalculate layer moduli from FWD deflection basins using AASHTO 1993 empirical equations, then compare results against original design values for the Corona street network.
Methodology applied in Corona California
Key steps in our evaluation include:
- Core sampling with a 100-mm diameter diamond bit to extract pavement layers and measure thickness
- Dynamic cone penetrometer (DCP) tests per ASTM D6951-18 to estimate CBR of base and subgrade
- Falling weight deflectometer (FWD) drops at three load levels (30, 40, 50 kN) to backcalculate layer moduli
- Ground-penetrating radar (GPR) scans using a 1.5 GHz antenna to map subsurface voids and delamination
Typical technical challenges in Corona California
The Mediterranean climate of Corona brings hot, dry summers and mild winters with occasional heavy rain from Pacific storms. This wet-dry cycle creates a risk of subgrade strength loss when clay soils absorb moisture, leading to pavement pumping and edge cracking. We have seen cases where surface cracking appeared fine but FWD testing revealed a 40% reduction in subgrade modulus after a wet winter. Without a proper existing pavement evaluation in Corona California, engineers risk designing an overlay thickness that is inadequate for the actual support conditions. That is why we run DCP tests at every 100 m along the project alignment to capture variability in subgrade strength across the site.
Our services
Our existing pavement evaluation in Corona California covers three core services that address the most common rehabilitation needs in the area.
FWD Deflection Testing
We perform falling weight deflectometer tests at 50-m intervals along the project corridor. The FWD applies a 40 kN impulse load and records deflection at seven radial offsets. Data is processed through backcalculation software to determine layer moduli for existing asphalt, base, and subgrade.
Core Sampling and Lab Analysis
We extract 100-mm diameter cores from the existing pavement and perform laboratory tests including asphalt content (ASTM D6307-19), gradation of extracted aggregate, and moisture damage susceptibility (AASHTO T-283). Results are used to assess stripping potential and binder aging.
DCP and GPR Survey
A dynamic cone penetrometer test at each FWD location gives us in-situ CBR values for the base and subgrade layers. Ground-penetrating radar scans provide continuous subsurface imaging to locate voids, moisture pockets, and layer thickness variations without additional coring.
Frequently asked questions
How much does an existing pavement evaluation cost in Corona California?
A standard evaluation covering FWD testing, core sampling, and DCP tests for a 1-mile stretch typically ranges between US$1,270 and US$4,080. The final price depends on traffic control requirements, number of test points, and whether laboratory asphalt analysis is included.
What pavement distresses are most common in Corona?
We see longitudinal cracking along wheel paths from thermal fatigue and reflective cracking at joints from old concrete pavements. In areas with clay subgrade, block cracking and pumping are frequent due to moisture changes. Alligator cracking appears where base layers have lost support from water intrusion.
How many test points are needed for a typical residential street?
For a standard two-lane residential street in Corona, we recommend one FWD test and one DCP test every 100 m along the centerline, plus one core sample every 200 m. This gives enough coverage to capture variability from driveways, utility cuts, and tree root zones.
Can you evaluate pavement with asphalt overlay over concrete?
Yes, we handle composite pavements routinely. The FWD deflection basin for a thin overlay over concrete shows a stiff response, and we use different backcalculation algorithms to separate the asphalt and concrete layer moduli. Core samples confirm the thickness of each layer and the condition of the bond between them.