924 COLD PATCH MATERIAL

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This is not a legal document. Please see disclaimer for more information.
924.01 DESCRIPTION
Cold Patch Materials (CPM), including Water-Activated Cold Patch Material (WACPM), are high performance asphalt patching materials used to repair potholes, deteriorated concrete, and asphalt pavement in all seasons. The material shall be capable of making permanent repairs with minimal effort and with minimal disruption to traffic.
CPM/WACPM are produced by approved manufacturers using specially formulated binders. The CPM material may be produced in bulk and stockpiled or packaged in buckets or bags weighing 40 lb to 50 lb, or packaged as approved. The WACPM is produced and packaged in buckets or bags weighing 35 lb to 60 lb. Select from the Qualified Products List (QPL).
924.02 MATERIALS
Aggregates       M29
      T11
      T2
Binder       D244
      D402
      T 59
      T 78
924.02.01 Binder. Binder shall provide aggregate coverage according to TP 40. No additives, modifiers, or extra ingredients maybe introduced into the liquid oil blend after shipment. Binder shall meet a maximum of 0.1 percent volume by weight of the original sample when tested to 500 F (260 C) according to T 59 or, the binder shall contain no more than 6.0 milliliters of oil distillate when tested according to D244, D402 or T 78, depending on the type of binder used. The residual binder content shall be approximately of 5 percent to 9 percent of the mix.
924.03 MIX PERFORMANCE REQUIREMENTS
Cold Patch Material patches shall remain in place when paved over and shall not adversely affect the final surface. The material shall not require primer or tack and shall be compatible with asphalt and/or concrete at a minimum thickness of 1/2 in. The material must be capable of filling potholes in wet or dry conditions in ambient temperatures as low as to 5 F and up to 100 F.
The material shall permanently adhere to deteriorated concrete or bituminous pavement until the surrounding pavement fails. Removal shall not be required when the surface is overlaid with asphalt.
The Administration reserves the right to sample composite material or mixture at any time.
WACPM Job Mix Formula. The job mix formula shall establish a single percentage of aggregate passing each required sieve, a single percentage of binder to be added to the aggregate and a range of add water required to activate strength.
Submit results of the proposed job mix formula to the Office of Materials Technology through the Engineer for approval. The report shall show that all materials were tested and meet the following.
Aggregate Gradation
Sieve Size Percent Passing
4.0mm

(1/8")

6.0mm

(1/4")

9.0mm

(3/8")

12.0mm

(1/2")

1/2" 100 100 100 95-100
3/8" 100 100 85-100 65-85
#4 90-98 80-100 35-60 38-60
#8 60-70 20-55 15-35 24-45
#16 40-57 12-32 14-25 10-20
#200 4-9 3-6 3-6 3-6
Job Mix Formula Analysis
TEST TEST

Designation

Specification

limits

Gradation T 30 Report
Particle Coating T 195 >95 percent
Asphalt Content T 308 5.0 - 9.0 percent
Draindown T 305 <8 percent


924.03.01 Storage. CPM/WACPM furnished in bags or containers shall be stored in accordance with the manufacturer’s recommendations. CPM/WACPM shall remain workable in storage for at least six months.
CPM may also be furnished from stockpiled material that has been stored outside
924.03.02 Usage. CPM shall be uniformly mixed and require no mixing prior to use. The material shall be capable of being poured or shoveled into a hole. The material shall require minimal pothole preparation consisting of removing most of the water and debris as possible from the pothole. The material shall be capable of displacing any water remaining in the hole. The material shall be placed and compacted in accordance with the manufacturer’s recommendations. The material shall not ravel nor adhere to tires when opened to traffic.
924.03.03 Quality Control Plan (QCP). Submit a Quality Control Plan (QCP) that includes the following:
(a) Description of Material.
(b) Contact Personnel.
(c) Safety Data Sheets (SDS).
(d) Technical Data Sheets, including VOC content.
(e) Job Mix Formula.
(f) QC Material Sampling Process.
(g) Storage Requirements.
The QCP shall also state that if a test result indicates that a shipment is not in compliance with specifications, the following shall apply.
(a) Immediately notify the Administration of the shipment in question.
(b) Identify the material.
(c) Cease shipment until material complies with specifications.
(d) Notify the Administration prior to resuming shipment.
(e) Implement any mutually agreed upon procedures for the disposition of the material.
In the event a mutual agreement is not achieved, the Administration shall have final authority in the decision on specification compliance.
924.04 CERTIFICATION
Provide certification that the material meets requirements as specified in TC-1.03 and the following:
(a) A guarantee the material conforms to the Materials, Binder, Mix Performance and Storage requirements and COMAR environmental regulations.
(b) Employ an unaffiliated AASHTO-accredited laboratory to perform all testing for certification.
Acceptance testing will be completed on delivered material as determined. Each delivery shall be considered one lot. The material may be subject to a workability evaluation either in the lab or in the field. Non-conforming materials will be rejected whether in-place or not. Remove all CPM inventory on hand that fails to meet requirements and replace.
Replacement Warranty. Material that does not remain workable in storage for at least six months shall be replaced. Product that does not perform in normal pothole patches for at least twelve months will be evaluated for performance. Material that consistently fails to meet requirements will be removed from the QPL.