Density / Relative Compaction.
Calculated.
The Caltrans in-situ asphalt concrete workbook, with every formula wired. Random stations, count ratios, density, RC% — done the moment you type the nuclear reading.
Every cell
audited.
The workbook mirrors TL-3112 (Rev. 02/04) line-for-line and runs every calculation the form requires. You fill nuclear readings and project data. The sheet does the arithmetic — and the policing.
Random locations, per spec
Generates the 10 random numbers and test-site math CT-375 requires. No hand-rolling, no spreadsheets on a napkin.
Station & offset math
Longitudinal I = D × G, Station I + B, Transverse E × H. Rounded up to whole feet the way CT-375 wants them, with edge sites moved to 1 ft.
Count ratio → density
Field count divided by standard count (L / A), density read through your gauge's calibration, rounded to 0.01 g/cc.
Correlation & LTMD
Applies the correlation factor to your FTMD (R × S) to land on LTMD, and carries the (4/3/2025)-style dated reference through every sublot.
Relative Compaction %
Computes RC = (Q / T) × 100 to the nearest 0.1% exactly as CT-375 specifies, averaged and flagged against the 95% LTMD threshold.
Multi-lift, multi-sublot
Built for conventional 0.20 ft and thin-lift 0.18 ft runs on the same project, with field-note space for transverse moves (e.g. sta. 699+42).
A 0.4% math error
is a rejected lot.
HMA has to hit at least 95% LTMD. Below that, the engineer deducts pay or refuses the lot. One transposed count, one bad average, and a sublot that passed in the field fails on paper.
Caltrans Section 39 requires one density test per 1000 tons of HMA placed. Every test runs through TL-3112. Every RC% is argued over if it's close to the threshold.
This workbook removes the arithmetic from the argument. Hand it to a contractor's QC, hand it to the RE — the formulas are the formulas. You spend your time where judgment actually matters: the gauge seat, the lift thickness, the cold joint.
- 01Minimum relative compaction (HMA)≥ 95.0%
- 02Tests required per 1,000 tons placed1 min.
- 03RC reported to nearest0.1 %
- 04Density rounded to nearest0.01 g/cc
- 05Correlation factor verified every3 mo.
- 06Typical time saved per sublot~20 min
Send me the workbook.
Drop your email. The file lands in your inbox and the download starts immediately. You'll get the occasional update when we ship a new CT tool — nothing else.
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Terms
The workbook is free to use and is provided as is. It follows California Test 375 (February 2012) and Form TL-3112, but you are responsible for checking its results against the current test method and your contract's specifications before relying on them. Bunker Inspections is not affiliated with Caltrans.