Allentown sits in the Lehigh Valley where freeze-thaw cycles average 100 per year and annual precipitation reaches 45 inches, conditions that relentlessly attack pavement structure. Water infiltration through cracks, frost heave in silty subgrades, and repeated heavy truck loads from the I-78 and Route 22 corridors create a complex degradation pattern that standard visual inspections simply miss. An existing pavement evaluation in Allentown must therefore go beyond surface distress mapping: we combine falling weight deflectometer (FWD) testing with continuous core recovery to measure remaining structural capacity layer by layer. In our experience, many municipal roads here appear sound on the surface while the base course is already saturated and losing modulus. Before designing an overlay or full reconstruction, we recommend complementing the evaluation with a subgrade CBR test to verify support values, and if the subgrade shows high plasticity, a Atterberg limitsanalysis helps decide whether chemical stabilization is needed.
Over 100 freeze-thaw cycles per year in Allentown mean pavement structural capacity can drop 40% before surface cracking appears.
Method and coverage
Allentown grew rapidly during the industrial era, and many of its arterial roads were built on variable fills over glacial till and alluvial deposits from the Lehigh River floodplain. That heterogeneous foundation means pavement performance differs block by block. Our evaluation methodology starts with a detailed coring program — typically 4-inch diameter cores every 500 feet per lane — to measure layer thickness, material type, and signs of stripping or moisture damage in asphalt. We then run dynamic cone penetrometer (DCP) tests in the core holes to profile subgrade strength at 1-inch increments, which is especially useful for catching soft pockets left by old stream channels. For sections where the subgrade is suspected to be expansive, we incorporate laboratory swelling tests to quantify volume change potential. The field data feeds into a back-calculation of layer moduli using AASHTO 1993 or mechanistic-empirical (MEPDG) models, giving us a remaining life estimate that accounts for Allentown's specific traffic spectrum and climate.
Technical reference image — Allentown
Regional considerations
The dominant soil in Allentown's pavement subgrades is a silty clay loam (ML-CL per USCS) derived from limestone residuum, often with seasonal groundwater within 3 to 5 feet of the surface. When this material freezes, ice lenses form and cause differential heave of up to 2 inches; during spring thaw, the saturated subgrade loses 60–70% of its resilient modulus, leading to rapid fatigue cracking in the asphalt layer. We have measured alligator cracking appearing in as little as two winters on roads where the original pavement evaluation did not account for frost susceptibility. Another risk is the presence of buried utilities and old foundations from Allentown's industrial past — without GPR scanning prior to coring, crews risk hitting gas lines or encountering unexpected rigid inclusions that skew deflection data.
Continuous 4-inch cores through asphalt, base, and subbase. Each core is photographed, measured for thickness, and logged for material type, stripping, and moisture content.
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Falling Weight Deflectometer (FWD)
Non-destructive deflection testing at 50 ft intervals. Data is used to back-calculate layer moduli and estimate remaining structural life under Allentown's design traffic.
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Subgrade DCP & CBR Testing
Dynamic cone penetrometer profiles at each core location, plus laboratory CBR on undisturbed subgrade samples to verify support values for overlay design.
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Ground Penetrating Radar (GPR) Scan
Pre-core scanning to map utilities, locate buried foundations, and identify layer thickness variations without excavation. Critical for avoiding utility strikes in Allentown's dense urban grid.
Standards that apply
ASTM D4694 – FWD deflection testing, ASTM D5361 – Asphalt core sampling, AASHTO T 307 – Resilient modulus of subgrade, ASTM D6433 – Pavement condition index (PCI)
Quick answers
What is the typical cost range for an existing pavement evaluation in Allentown?
For a standard city block or parking lot, the evaluation including coring, FWD, and laboratory testing typically ranges between US$1,190 and US$3,820. Larger arterial road segments with higher traffic volumes increase the scope and therefore the cost.
How long does a pavement evaluation take from field work to report?
Field coring and FWD testing for a one-mile stretch usually take 1 to 2 days. Laboratory testing of cores and subgrade samples adds another 5 to 7 business days. A full report with remaining life estimates is delivered within 10 to 14 days.
Do you offer FWD testing on concrete pavements in Allentown?
Yes. Our FWD equipment is calibrated for both asphalt and Portland cement concrete (PCC) pavements. For rigid pavements we place the load plate at mid-slab and at joints to evaluate load transfer efficiency and slab support conditions.
What standards do you follow for pavement evaluation in Allentown?
We strictly follow ASTM D4694 for FWD testing, ASTM D5361 for coring, and AASHTO T 307 for subgrade resilient modulus. All laboratory work is performed under ISO 17025 accreditation, and reports reference the latest AASHTO and MEPDG design guides.
Location and service area
We serve projects across Allentown and its metropolitan area.
