PATCHING MIX 3U18 AND 3U58M
3105.1SCOPE
Provide dry, bagged concrete patching mix 3U18 for repairing Portland cement concrete pavement and 3U58M for repairing Portland cement concrete Bridge decks, Bridge deck overlays, and approach panels.
3105.2REQUIREMENTS
A Materials Provide Materials for patching mix meeting the following requirements: A.1 Cement or Blended Cement ........................................................................ 3101 or 3103 Mix 3U58M utilizes air-entraining and Water-reducing Admixtures. Provide the manufacturer’s Technical Data Information Sheet and the Materials Safety Data Sheet (MSDS) for the proposed dry admixtures when submitting the Quality Plan for approval . B Blending Blend the Aggregates to meet the requirements of Table 3105.2-1.
Table 3105.2-1 3U18 Gradation Requirements Sieve Size Percent Passing 3/8 inch 100 No. 4 70-90 No. 8 40-80 No. 16 25-50 No. 30 15-35 No. 50 0-18 No. 100 0-8 No. 200 ≤ 2.3
Dry the Aggregates as approved by the Engineer before blending with the cement. Blend Materials completely before bagging the mix. Provide a blending device meeting the following characteristics and requirements:
fine Aggregate
weights C Mix Proportions Proportion the mix in accordance with Table 3105.2-2. Use of any other size bag requires approval of the Concrete Engineer. Table 3105.2-2 Mix Proportions Material Gradation Requirements Weight 50 pound bag Weight 75 pound bag Weight 3000 pound bag Type I or IL Cement 11.9 17.8 712 Blended Aggregate Table 3105.2-1 Proportions determined each day on the 3U18 Quality Control Worksheet
D Quality Control (QC) Program Before producing concrete patching mix each construction season, a Department Certified Concrete Plant Technician representing the Department, shall perform a thorough on- site inspection of the plant with a Department Certified Plant Technician representing the producer. In order to obtain certification, the producer will complete the Contact Report – Prepackaged Dry Concrete, prior to the on-site inspection with the Department representative.
Contact Report certifying compliance with the certified ready-mix requirements and continual maintenance of the plant to assure that the plant can produce concrete meeting Department Specifications.
the Contact Report signifying that the plant complies with all requirements prior to concrete production.
Maintain an approved Quality Control Program, including a Quality Plan, for the production of bagged Portland cement concrete patching mix. Notify the Concrete Engineer immediately if a change is made to the Quality Control Program. The producer will perform Quality Control (QC) as part of the production of grade 3U18 and 3U58M concrete. The Engineer will perform Quality Assurance (QA) as part of the acceptance process. D.1 Quality Plan Requirements Submit a Quality Control Plan to the Concrete Engineer for review and approval prior to initial production of 3U18 and 3U58M. The Quality Plan includes the following QC Procedures:
D.2 MnDOT Certified Personnel Provide a Department Concrete Plant Technician to perform moisture content testing, Aggregate gradation testing, review batch tickets, review test results, and oversee Q uality Control requirements of 3105, “Bagged Portland Cement Concrete Patching Mix 3U18 and 3U58M,” and the QC Program. D.3 Daily Production Requirements Each day 3U18 or 3U58M bag mix is produced, the Department Certified Concrete Plant Technician, representing the producer will complete the following:
to Department the day following production E Bags and Batch Identification Provide moisture-proof bags resistant to tearing. Print the following on the bags:
PATCH MIX”
3105.3SAMPLING AND TESTING
The producer and Engineer will sample and test in accordance with the Schedule of Materials Control.
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