HYDRATED LIME
PART 1 GENERAL
1.1SECTION INCLUDES
A.Products and procedures for incorporating hydrated lime into all asphalt
mixes.
1.2RELATED SECTIONS Not Used
1.3REFERENCES
A.AASHTO M 303: Lime for Asphalt Mixtures
B.ASTM C 110: Physical Testing of Quicklime, Hydrated Lime, and
Limestone
C.ASTM C 1097: Hydrated Lime for Use in Asphalt Cement or Bituminous
Paving Mixtures
D.ASTM C 1602: Mixing Water Used in the Production of Hydraulic Cement
Concrete
E.UDOT Materials Manual of Instruction
F.UDOT Quality Management Plans
1.4DEFINITIONS Not Used
1.5SUBMITTALS Not Used
1.6QUALITY ASSURANCE
A.Use a supplier of Hydrated Lime that is pre-qualified through UDOT
Quality Management Plan 510.
B.Comply with UDOT Quality Management Plan 514, Asphalt Mix.
Hydrated Lime
PART 2 PRODUCTS
2.1HYDRATED LIME
A.Hydrated Lime – Refer to AASHTO M 303, Type I.
1.Refer to ASTM C 1097, Physical Requirements.
2.Use test method ASTM C 110.
2.2WATER
A.Use potable water or water according to ASTM C 1602.
PART 3 EXECUTION
3.1APPLICATION
A.Add hydrated lime to all asphalt pavement mixes.
1.Add lime as determined in the approved mix design.
2.Base the amount of hydrated lime used on the dry weight of the
virgin aggregate.
3.Use either Method A or B, unless Method B is specified.
4.Use Method A only when the mix is produced by a Certified Asphalt
Mix Supplier. Refer to the UDOT Quality Management Plan 514 Asphalt Mix.
B.Method A – Dynamic Feed Lime Slurry
1.Lime Slurry –At least three parts water to one part lime by weight.
a.Adjust the amount of added water to meet the 3:1 lime slurry
to account for the moisture in the stockpile.
b.Use lime slurry with a minimum of one part water by weight
of lime.
2.Add at least 1 percent lime by weight of the virgin aggregate.
3.Deliver lime slurry to the twin shaft pugmill for mixing with
aggregate.
a.Use a virgin aggregate/lime mixture that contains at least 3
percent water by weight of the virgin aggregate after the pugmill.
4.Adjust quantity (percent) of lime as necessary, based on results of
Hamburg Wheel Tracker test.
5.Verify that Lime Slurry equipment is operating at all times.
a.The Engineer may require Method B, marination of the
aggregate/hydrated lime mixture in the stockpile if the Asphalt Mix is supplied without hydrated lime slurry treatment.
Hydrated Lime
C.Method B – Lime and Aggregate Stockpile Marination
1.Method B is an option for a Certified Asphalt Mix Supplier.
2.Method B is required for all Asphalt Mix Suppliers that are not
certified according to the UDOT Quality Management Plan 514 Asphalt Mix.
a.The Engineer will inspect the marination process when the
Asphalt Mix supplier is not certified at the time of production.
3.The Department applies a deduction for mix produced by a non-
certified supplier to cover the cost of the inspection.
a.The deduction is according to the UDOT Quality
Management Plan 514 Asphalt Mix.
4.Provide sufficient free moisture to thoroughly wet the aggregate
and activate the lime before introducing hydrated lime.
a.The aggregate/lime mixture will contain at least 3 percent
water by weight of the virgin aggregate.
5.Add at least 1½ percent lime by weight of the virgin aggregate.
6.Thoroughly mix wet aggregate/lime mixture in a twin shaft pugmill.
7.Marinate the aggregate/lime mixture in the stockpile for at least 48
hours.
8.Adjust quantity (percent) of lime as necessary, based on results of
Hamburg Wheel Tracker test, UDOT Materials Manual of Instruction 990.
9.Use the wet cured aggregate within 60 days except as otherwise
provided in the UDOT Quality Management Plan 514 Asphalt Mix.
D.Mixing Methods A and B – Provide a horizontal twin shaft pugmill.
1.Adjust mixing paddles in the pugmill so that the aggregate being
discharged is completely coated by the lime slurry.
2.Do not allow volume of material in the pugmill to extend above the
vertical position of the blade tips.
3.2QUALITY CONTROL
A.Tolerance Controls
1.Tolerance lime weight vessel static calibration ± 1.5 percent
2.Dynamic delivery calibration ± 1.5 percent
3.Inlet flow meter ± 2 percent
4.Discharge flow meter ± 1.5 percent
END OF SECTION
Hydrated Lime
Hydrated Lime in other states
Utah revises spec sections through supplementals and new editions. We check this one every week and email you the day it changes. Free, no account.
Source: Utah Standard Specifications for Road and Bridge Construction, 2026 Edition. Pages 528–530 of 1,331.
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