CDOT Form 427 "Nuclear Soils Moisture-Density Test" - Colorado

What Is CDOT Form 427?

This is a legal form that was released by the Colorado Department of Transportation - a government authority operating within Colorado. As of today, no separate filing guidelines for the form are provided by the issuing department.

Form Details:

  • Released on June 1, 2018;
  • The latest edition provided by the Colorado Department of Transportation;
  • Easy to use and ready to print;
  • Quick to customize;
  • Compatible with most PDF-viewing applications;
  • Fill out the form in our online filing application.

Download a fillable version of CDOT Form 427 by clicking the link below or browse more documents and templates provided by the Colorado Department of Transportation.

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Download CDOT Form 427 "Nuclear Soils Moisture-Density Test" - Colorado

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Contract ID
Region
Colorado Department of Transportation
Project Number:
Soils and Aggregate Density/Moisture CP80
Project Location:
Soil- Rock Correction CP23 & Density Check (1 Point) CP25
Pit Name:
Material:
T99
Item:
Class:
Material Code (SMM):
Curve NO.
Classification:
Method
A
D
T180
Gauge ID:
Tested by:
Maximum Dry Density:
Optimum Moisture Content:
Moisture Standard Count:
Sample ID SMM:
Test NO:
Station:
Depth Below Grade:
Density Standard Count:
Date:
Transmission Depth (Probe Setting)
Lane:
Offset:
Field Test Gauge Readings CP80
M/D Gauge Moisture Verification T265
% Moisture
Density
Pan ID:
Pan Wt.:
Reading 1:
Dry:
Wet:
Wet Soil & Pan:
Wet:
Reading 2:
Dry:
Dry Soil & Pan:
Wet:
Reading 3:
Dry:
Wet Soil Wt.:
Wet:
Reading 4:
Dry:
Dry Soil Wt.:
Average:
Ave:
____________
Ave: ____________
________________
Loss:
FDR/RAP - Max. Dry Density: Wet density corrected to Dry Density use formula here.
% Moisture (A):
Ave. Wet Density ____________÷ [1 + (T265 % moist A ___________ ÷ 100)] = _____________ Dry
Specifications for % Moisture:
Full Depth Reclamation: Record Wet Density only. Mixture shall be compacted to a min. of 95% of the
Gauge % Moisture within ± 1% of T265.
Max. dry density determined by T180 Method D. CP25 & T265 must be performed at each in-place
density location to verify the curve. See CP80 - 8.4.3.
If not, perform T265 at each location
CP80 - Percent Compaction Calculations with less than 5 % Rock (+#4)
Field Dry Density _________ ÷ Curve Max. Dry Density __________ x 100 =
% Relative Compaction at ________ % Moisture
CP23 Calculations for Percent Rock (+#4) and Soil
Method A - Oven Dried
Dry weight of Rock ____________ ÷ Dry Weight of Total Sample __________ x 100 = Rock ______%
100 - % Rock = Soil _______%
Method B - Using Moisture Density Gauge Moisture Content
Total Weight of Dry Sample
Wet Weight of Rock ____________ ÷ [1 + (Absorption _____ ÷ 100)] = Dry Weight of Rock _________ (a)
Dry wt. of Rock (a) + Dry wt. of Soil (b)
______________ (c)
Wet Weight of Soil ______________ ÷ [1 + (Gauge % Moisture _____ ÷ 100)] = Dry Weight of Soil _________ (b)
100 - % Rock (d) = Soil ________%
Dry Weight of Rock (a) __________ ÷ Total Weight of Dry Sample (c) _____________ x 100 = Rock ______ % (d)
CP23 Rock Correction Calculations
CP23 Optimum Moisture Calculations
AASHTO T 99 CF = 0.90
AASHTO T180 CF = 0.95
% Soil_____ x Max.Dry Density of Soil__________ = ___________(a)
% Soil _________ x Opt. Moisture Content ______ = _________ (a)
% Rock ____ x CF _____ x (SpG of Rock ______ x 62.4) = _________(b)
% Rock ___________ x Absorption ________ = __________ (b)
Sum (a) + (b) ________ ÷ 100 = Corr. Max. Dry Density ____________
Sum (a) + (b) __________ ÷ 100 = Corr. Opt. Moisture __________%
CP80 - Percent Compaction Calculations with more than 5 % (Rock % =________+#4)
Field Dry Density _________ ÷ Corrected Max. Dry Density _________ x 100 =
% Relative Compaction at _________ % Moisture
CP25 - Compaction Cylinder Density Check (1 Point)
T265 Moisture Content
(lbs)
Pan ID _____ Pan wt. ________
Weight of Mold _____________
Mold ID ________
Mold Volume ____________
Wet Soil & Pan ______________
Dry Soil & Pan ______________
(lbs)
(lbs)
Weight of Soil & Mold
_________ - Weight of Mold _________ = Weight of Compacted Soil _______
Wet Soil ______________
(lbs)
Weight of Compacted Soil _________
÷ Mold Volume _____________ = Wet Density __________
Dry Soil ______________
Loss ________
Wet Density ____________÷ [ 1 + (T265 % Moist B) ______ ÷ 100)] = Dry Density ______________
% Moisture (B): ____________
Place IA Stamp Here:
IA Sample ID:
IA % Relative Compaction:
% Moisture:
Remarks:
Electronic Signature of IA Personnel
6/18
Previous editions are obsolete and may not be used
CDOT Form #427
Contract ID
Region
Colorado Department of Transportation
Project Number:
Soils and Aggregate Density/Moisture CP80
Project Location:
Soil- Rock Correction CP23 & Density Check (1 Point) CP25
Pit Name:
Material:
T99
Item:
Class:
Material Code (SMM):
Curve NO.
Classification:
Method
A
D
T180
Gauge ID:
Tested by:
Maximum Dry Density:
Optimum Moisture Content:
Moisture Standard Count:
Sample ID SMM:
Test NO:
Station:
Depth Below Grade:
Density Standard Count:
Date:
Transmission Depth (Probe Setting)
Lane:
Offset:
Field Test Gauge Readings CP80
M/D Gauge Moisture Verification T265
% Moisture
Density
Pan ID:
Pan Wt.:
Reading 1:
Dry:
Wet:
Wet Soil & Pan:
Wet:
Reading 2:
Dry:
Dry Soil & Pan:
Wet:
Reading 3:
Dry:
Wet Soil Wt.:
Wet:
Reading 4:
Dry:
Dry Soil Wt.:
Average:
Ave:
____________
Ave: ____________
________________
Loss:
FDR/RAP - Max. Dry Density: Wet density corrected to Dry Density use formula here.
% Moisture (A):
Ave. Wet Density ____________÷ [1 + (T265 % moist A ___________ ÷ 100)] = _____________ Dry
Specifications for % Moisture:
Full Depth Reclamation: Record Wet Density only. Mixture shall be compacted to a min. of 95% of the
Gauge % Moisture within ± 1% of T265.
Max. dry density determined by T180 Method D. CP25 & T265 must be performed at each in-place
density location to verify the curve. See CP80 - 8.4.3.
If not, perform T265 at each location
CP80 - Percent Compaction Calculations with less than 5 % Rock (+#4)
Field Dry Density _________ ÷ Curve Max. Dry Density __________ x 100 =
% Relative Compaction at ________ % Moisture
CP23 Calculations for Percent Rock (+#4) and Soil
Method A - Oven Dried
Dry weight of Rock ____________ ÷ Dry Weight of Total Sample __________ x 100 = Rock ______%
100 - % Rock = Soil _______%
Method B - Using Moisture Density Gauge Moisture Content
Total Weight of Dry Sample
Wet Weight of Rock ____________ ÷ [1 + (Absorption _____ ÷ 100)] = Dry Weight of Rock _________ (a)
Dry wt. of Rock (a) + Dry wt. of Soil (b)
______________ (c)
Wet Weight of Soil ______________ ÷ [1 + (Gauge % Moisture _____ ÷ 100)] = Dry Weight of Soil _________ (b)
100 - % Rock (d) = Soil ________%
Dry Weight of Rock (a) __________ ÷ Total Weight of Dry Sample (c) _____________ x 100 = Rock ______ % (d)
CP23 Rock Correction Calculations
CP23 Optimum Moisture Calculations
AASHTO T 99 CF = 0.90
AASHTO T180 CF = 0.95
% Soil_____ x Max.Dry Density of Soil__________ = ___________(a)
% Soil _________ x Opt. Moisture Content ______ = _________ (a)
% Rock ____ x CF _____ x (SpG of Rock ______ x 62.4) = _________(b)
% Rock ___________ x Absorption ________ = __________ (b)
Sum (a) + (b) ________ ÷ 100 = Corr. Max. Dry Density ____________
Sum (a) + (b) __________ ÷ 100 = Corr. Opt. Moisture __________%
CP80 - Percent Compaction Calculations with more than 5 % (Rock % =________+#4)
Field Dry Density _________ ÷ Corrected Max. Dry Density _________ x 100 =
% Relative Compaction at _________ % Moisture
CP25 - Compaction Cylinder Density Check (1 Point)
T265 Moisture Content
(lbs)
Pan ID _____ Pan wt. ________
Weight of Mold _____________
Mold ID ________
Mold Volume ____________
Wet Soil & Pan ______________
Dry Soil & Pan ______________
(lbs)
(lbs)
Weight of Soil & Mold
_________ - Weight of Mold _________ = Weight of Compacted Soil _______
Wet Soil ______________
(lbs)
Weight of Compacted Soil _________
÷ Mold Volume _____________ = Wet Density __________
Dry Soil ______________
Loss ________
Wet Density ____________÷ [ 1 + (T265 % Moist B) ______ ÷ 100)] = Dry Density ______________
% Moisture (B): ____________
Place IA Stamp Here:
IA Sample ID:
IA % Relative Compaction:
% Moisture:
Remarks:
Electronic Signature of IA Personnel
6/18
Previous editions are obsolete and may not be used
CDOT Form #427