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The RoadReader 3450 Thin Layer & Full Depth Density Gauge is the most versatile moisture density gauge ever produced. It combines the measurement modes proven in thousands of Troxler 3400 series gauges with a patented method for true thin layer asphalt and concrete bridge deck overlay density measurement.

By combining thin layer and full depth measuring capabilities in one instrument, the RoadReader 3450 is our flagship gauge in the 3400 series. With its versatility, speed, and economy, the RoadReader Plus is designed to satisfy your compaction control needs at every stage of your project.

Easy Operation and Quick Measurements

The RoadReader is simple to use. An expanded keypad and easy-to-follow prompts provide access to all major gauge functions. It also provides both density and moisture measurements without time-consuming calculations, including wet density, dry density, moisture, percent moisture, percent compaction, percent voids, and percent air voids.

Additional Features

A backlit screen provides exceptional viewing for low-light and nighttime testing.

An adjustable beeper signals test completion over the roar of traffic or heavy equipment.

The gauge stores up to 1,000 test readings under multiple projects for future use and/or download.

The free Troxler App makes data transfer to a portable device simple.

Like all 3400 series gauges, the Model 3450 meets ASTM Standard Test Methods D6938, D2950, C1040, and also AASHTO T 310 and T 355.

Specifications

Measurement (U.S. Customary Units)
Direct Transmission Density (6″)
15 sec.
1 min.
4 min.
Precision at 120 pcf
±0.32 pcf
±0.15 pcf
±0.08 pcf
Composition error at 120 pcf
±0.50 pcf
±0.50 pcf
±0.50 pcf
Surface error (0.05″, 100% Void)
-1.1 pcf
-1.1 pcf
-1.1 pcf
 
 
 
Backscatter (98%) (4″)
15 sec.
1 min.
4 min.
Precision at 120 pcf
±1.00 pcf
±0.50 pcf
±0.25 pcf
Composition error at 120 pcf
±0.87 pcf
±0.87 pcf
±0.87 pcf
Surface error (0.05″, 100% Void)
-5.0 pcf
-5.0 pcf
-5.0 pcf
 
 
 
Moisture at 15 pcf
15 sec.
1 min.
4 min.
Precision at 15 pcf
±0.69 pcf
±0.34 pcf
±0.17 pcf

Surface error (0.05″, 100% Void)
Depth of measurement @ 15 pcf (8.45″)

-1.12 pcf
 
-1.12 pcf
 
-1.12 pcf
 
 
Measurement (S.I. Units)
Direct Transmission Density-150mm
15 sec.
1 min.
4 min.
Precision at 2000 kg/m3
±5.2 kg/m3 
±2.6 kg/m3
±1.3 kg/m3
Composition error at 2000 kg/m3 
±8.0 kg/m3 
±8.0 kg/m3
±8.0 kg/m3
Surface error (1.25mm, 100% Void) 
-18.0 kg/m3
-18.0 kg/m3
-18.0 kg/m3
 
 
 
Backscatter (98%) (100mm)
15 sec.
1 min.
4 min.
Precision at 2000 kg/m3
±16.0 kg/m3
±8.0 kg/m3
±4.0 kg/m3
Composition error at 2000 kg/m3
±14.0 kg/m3
±14.0 kg/m3
±14.0 kg/m3
Surface error (1.25mm, 100% Void)
-80.0 kg/m3
-80.0 kg/m3
-80.0 kg/m3
 
 
 
Moisture
15 sec.
1 min.
4 min.
Precision at 250 kg/m3
±11.0 kg/m3
±5.5 kg/m3
±2.8 kg/m3

Surface error (1.25mm, 100% Void) 
Meas. Depth @ 250 kg/m3 – 212.5mm

-19.0 kg/m3
 
-19.0 kg/m3
 
-19.0 kg/m3
 
 
Thin Overlay Mode
Precision at 2240 kg/m3 (140 pcf)      
Time (minutes)
Thickness
kg/m3
pcf
1
2.5 cm (1.0″)
±16
±1.0
5.0 cm (2.0″)
±10
±0.60
6.3 cm (2.5″)
±8
±0.50
10.0 cm (4.0″)
±8
±0.50
 
4
2.5 cm (1.0″)
±8
±0.50
5.0 cm (2.0″)
±5
±0.30
6.3 cm (2.5″)
±4
±0.25
10.0 cm (4.0″)
±4
±0.25
 
Radiological
Gamma Source 0.30 GBq (8 mCi) ±10% Cs-137
Neutron Source

1.48 GBq (40 mCi) ±10% Am-241:Be

Source Type Sealed Source – Special Form
Source Housing Stainless Steel Encapsulation (single or double)
Shipping Case Type A, Yellow II, TI =0.6
 
Electrical
Power Source(s) NiCad and AA Alkaline Batteries
Stored Power 33 watt-hours
Average Power Consumption

Idle Mode: 0.12 watts
Measurement Mode: 0.17 watts
Standby Mode: 0.06 watts
Backlight Mode: 0.6 watts

Default Time before Sleep Mode 30 seconds between key presses, no loss of data or previous status
Time before Automatic Shutdown

5 hours of complete inactivity

Battery Recharge Time 4 hours maximum, automatic shutoff
Charge Source 12 V dc Nominal, 800 MA minimum
Readout 4 x 20 alpha-numeric backlit LCD
Keypad 33 key sealed membrane
RAM 128 kbytes non-volatile
Serial Data Format 8 data bits, 2 stop bits, no parity
 
Mechanical
Gauge Height (with handles) 12″ rod: 604 H x 411 L x 229 W mm 
(23.8 H x 16.2 L x 9.0 W in.)

8″ rod: 503 H x 411 L x 229 W mm 
(19.8 H x 16.2 L x 9.0 W in.)

Case High Impact Plastic
785 H x 353 L x 455 W mm 
(30.8 H x 13.9 L x 17.9 W in.)
Weight 17 kg (37.5 lbs.)
Shipping Weight 43 kg (96 lbs)
Operating Temperature 32º to 122º F  (0º to 50º C)
Storage Temperature 0º to 140º F  (-18º to +60º C)
Max Text Material Surface Temp. 175°C (347°F) for 15 minutes
Humidity

98%, non-condensing

In addition to all the features found on the Models 3430 and 3440, the RoadReader 3450 Thin Layer & Full Depth Density Gauge gives you these additional features:

  • Covers all density and moisture measurement needs
  • Measures thin layer asphalt, full depth asphalt, soil, and aggregates
  • Runs on quick charge NiCad batteries or alkaline batteries
  • Sleep mode allows the gauge to conserve power when not in use
  • Adjustable beeper can be heard over traffic and equipment
  • Stores up to 1,000 test results
  • Backlit display allows for nighttime use
  • An alphabetical keypad allows you to enter notes for each project
  • An 18-month warranty