Intelligent compaction has been generating data for years. New Brunswick is giving that data a job.
Intelligent compaction (IC) is not new technology. IC-equipped rollers have been available for well over a decade, and the concept is elegant: instrument the roller with Global Positioning System (GPS), temperature sensors and accelerometer-based stiffness measurements, then display the results in real time so the operator can see what is happening beneath the drum. Pass counts, surface temperatures and coverage maps are generated automatically, updated live and visible on a screen in the cab. It is a genuinely smarter way to compact.
But for most of the time that IC has been around, that is where the data lived, on the screen. Contractors collected it on demonstration projects. Agencies reviewed it on research contracts. Academics published papers about it. But at the end of the day, specifications govern what counts, and acceptance came down to the same thing it always had: a nuclear density gauge, a core, a number. The roller knew more than the specification required but the specification did not ask.
That is starting to change.
The New Brunswick Department of Transportation and Infrastructure (NBDTI) has introduced an IC specification that went into all contracts this 2026 construction season. It is, by design, a first step, permissive rather than mandatory, incentive-based rather than punitive. But it’s not a pilot. It applies to every contract, and it puts IC data into NBDTI’s formal quality framework for the first time.
The structure is deliberate. The contractor may elect to use IC on the breakdown roller. When they do, the equipment must meet minimum requirements: temperature sensors capable of measuring asphalt surface temperature during compaction, a GPS receiver with 300 mm horizontal accuracy and an onboard display that generates real-time, color-coded maps showing roller position, pass count, compaction coverage and surface temperature ranges. The IC system must be calibrated and operational before paving begins, and the engineer can inspect it and request a demonstration at any time.
Acceptance is still based on standard density testing, and IC data is explicitly designated for informational and process control purposes only. Density testing is spot testing: a gauge reading or a core sample at a discrete location, a snapshot rather than a continuous picture of the mat. But here is the smart part: where IC is utilized in a lot, and that lot qualifies for a density bonus, the contractor receives one and a half times the standard bonus amount. That is a direct financial incentive to adopt the technology, without penalizing contractors who are not yet equipped.
“This is our first kick at the can,” says Matt Sweezie of NBDTI. “I’m excited to see how the specification evolves over time as both the contractors and NBDTI gain IC experience and evaluate the data.”
Three things shift when IC enters the specification, even in a permissive form.
The contractor’s feedback loop tightens. Real-time coverage maps mean that rolling pattern gaps, missed edges and cold-mat areas show up during the operation, not three days later when the cores come back and someone must explain a failing density result. An operator watching a color-coded pass-count map can see an under-compacted strip forming and have an opportunity to correct it while the mat is hot. That is not quality assurance after the fact, it is process control in real time, which is exactly what the specification calls it.
The inspector’s toolkit expands. A field engineer reviewing IC output has access to something they have never had before: continuous spatial data, temperature gradients across the mat, coverage uniformity and the relationship between roller passes and surface cooling. That is a fundamentally different information environment than a handful of gauge readings at random locations. The NBDTI specification wisely keeps acceptance on conventional density testing for now, but the inspector who can read an IC map will see things that spot testing simply cannot reveal — a joint that cooled too fast for adequate compaction, a pattern where the roller consistently missed the same strip or a temperature differential that suggests a segregation issue at the paver.
The agency builds a data archive. The specification requires the contractor to collect and retain IC data for each lot where it is used and to submit color-coded coverage and temperature maps upon request. Across projects and construction seasons, that accumulating dataset becomes the foundation for the next generation of specification development: thresholds, correlations and acceptance criteria grounded in field data rather than assumption.
NBDTI has signaled that this permissive specification is the starting point, with mandatory IC use planned within several years. The transition from optional incentive to mandatory requirement will surface the questions every agency adopting IC will eventually face. How do you calibrate IC-measured values against conventional density across different subgrade conditions and lift thicknesses? What training does an inspector need to interpret continuous compaction data rather than point measurements? And, when the data is good enough and the confidence is high enough, do you eventually replace spot testing with IC-based acceptance entirely?
Those are open questions, and they should be. New Brunswick is not trying to answer all of them at once. They are building the data, building the experience and building the contractor capacity one construction season at a time. The specification caught up to the roller. Now the industry catches up to the specification.
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