A guide to wireless concrete sensors: radio types, single-use vs reusable, range and battery trade-offs, and how to pick the right sensor for precast, mass concrete, bridges, and field work.
For decades, concrete temperature monitoring meant thermocouples on a long cable running back to a wired data logger. The setup worked but it was a wire-management problem on every pour: routing cables out of formwork, protecting them during placement, replacing them when crews cut them by accident. Field work and precast plants both wanted something simpler.
Wireless concrete sensors solve the cable problem. The sensor lives entirely inside the pour. It transmits over radio to a nearby phone or to a gateway on the plant network. The QC manager sees the data on a phone or laptop — without wires, without data loggers, without a tech truck for every pour.
BLE is the radio in your phone, your earbuds, and most single-use concrete sensors. Practical range through air is 25–50 feet. Through concrete and rebar, range drops sharply — often to a few feet. BLE is excellent for short-duration slab work where the crew is on the slab; less so for buried sensors expected to transmit for weeks.
Sub-gigahertz radios penetrate concrete and rebar much better than 2.4 GHz Bluetooth. They reach a mile or more line-of-sight to a gateway. Sub-GHz sensors continue transmitting after the pour is buried, support multi-week cures, and work across a busy plant where the QC manager is in the office and the bed is 200 feet away. Sensytec's SensyCast uses sub-GHz radio for this reason.
Wi-Fi has higher bandwidth but worse penetration through concrete and significantly worse battery efficiency. It's used in some bridge-deck and infrastructure sensor systems where a gateway can sit very close to the pour and battery isn't a hard constraint.
The most consequential decision is whether the sensor is single-use (entombed) or reusable (recovered after the pour).
| Single-use | Reusable | |
|---|---|---|
| Per-unit cost | Lower | Higher |
| Cost per pour at 200+ pours | High | Very low |
| Battery life | Weeks | 3+ years (rechargeable) |
| Install | Tie, pour, walk away | Tie at retrievable location |
| Best for | Slab on grade, tilt-up, <50 pours/year | Precast plants, mass pours, >200 pours/year |
Battery life depends on the radio, the transmission interval, and the sensing rate. A sensor that reads temperature once per minute and transmits once per hour can run for years on a small lithium cell. A sensor that reads and transmits every 30 seconds will burn through the battery in weeks. Reusable sensors with rechargeable batteries are sized for 3-year service life across hundreds of pours, recharging between cycles.
Most wireless concrete sensors measure temperature only. The maturity method computes strength from temperature, so temperature is the minimum viable signal.
A smaller category measures both temperature and electrical resistivity. Resistivity (per AASHTO T-358 surface and ASTM C1876 bulk methods) provides a second independent strength signal that is helpful when calibrations drift, and at later ages it correlates with chloride-ion penetration resistance — a key durability indicator. Sensytec's SensyCast is a two-signal wireless sensor.
An embedded device that measures temperature (and sometimes resistivity) inside concrete and transmits the data over radio — no cable to a data logger.
Bluetooth: 25–50 ft through air, much less through concrete. Sub-GHz: 1+ mile to a gateway, transmits through concrete. Sub-GHz wins for buried sensors and large plants.
Single-use: weeks. Reusable rechargeable: 3+ years across hundreds of pours.
95–99% correlation with cylinder breaks via ASTM C1074 maturity method. Wireless link doesn't affect accuracy — the temperature sensor and calibration do.
Single-use: simpler install, lower per-unit cost, entombed. Reusable: higher unit cost, much lower cost per pour at scale, recovered after each cure.
Yes. State DOTs accept ASTM C1074 maturity-method data regardless of radio type. Wireless sensors gain an audit advantage from automatic cloud upload of the temperature record.
SensyCast: temperature plus resistivity, sub-GHz radio, 1-mile range, 3-year rechargeable battery. ASTM C1074, AASHTO T-358, ASTM C1876.
Talk to an Expert