Category:413 Surface Treatments and Preventive Maintenance: Difference between revisions
No edit summary |
No edit summary |
||
| Line 1: | Line 1: | ||
==413.1 Materials Inspection== | ==413.1 Materials Inspection for Sec 413== | ||
===413.1.1 Scope=== | ===413.1.1 Scope=== | ||
| Line 10: | Line 10: | ||
'''Mix Design Procedure''' | '''Mix Design Procedure''' | ||
In order for a micro-surfacing mix formula to be approved, the contractor’s proposed job mix formula (JMF) shall be submitted as required in Standard Specification Sec 413.10.3. Trial mix samples will not be required unless requested by the Field Office. | In order for a micro-surfacing mix formula to be approved, the contractor’s proposed job mix formula (JMF) shall be submitted as required in [http://modot.mo.gov/business/standards_and_specs/Sec0413.pdf Standard Specification Sec 413.10.3]. Trial mix samples will not be required unless requested by the Field Office. If requested, the samples are to be obtained and submitted to the Central Laboratory in accordance with Field Section 1001. When possible, the JMF and correspondence should be transmitted electronically. The Materials Field Office e-mail address is MFO. | ||
<div id="District Procedure"> | <div id="District Procedure"> | ||
Revision as of 14:30, 8 June 2007
413.1 Materials Inspection for Sec 413
413.1.1 Scope
To establish procedures for mix design, inspection and acceptance of materials used in Micro-Surfacing, Scrub Seal, Ultrathin Bonded Wearing Asphalt Surface, Bituminous Fog Sealing, Bituminous Pavement Crack Sealing, Portland Cement Concrete Pavement Joint/Crack Sealing, Bituminous Pavement Crack Filling and Portland Cement Concrete Pavement Crack Filling. Aggregate for use in surface treatments shall be inspected in accordance with Field Section 1001 in the Materials Manual. Asphalt Binder for use in surface treatments shall be inspected in accordance with Field Section 1015 in Materials Manual.
413.1.2 Procedure
413.1.2.1 Micro-Surfacing
Mix Design Procedure
In order for a micro-surfacing mix formula to be approved, the contractor’s proposed job mix formula (JMF) shall be submitted as required in Standard Specification Sec 413.10.3. Trial mix samples will not be required unless requested by the Field Office. If requested, the samples are to be obtained and submitted to the Central Laboratory in accordance with Field Section 1001. When possible, the JMF and correspondence should be transmitted electronically. The Materials Field Office e-mail address is MFO.
District Procedure
When the District receives a proposed trial mix formula, as required by the Standard Specifications, the mixture properties, components and proportions should be checked to ensure compliance with Specifications and that they are approved for the intended use. It may be necessary for the District to advise the contractor to make changes in the proposed mixture in order to comply with Department policies. A QC plan in accordance with Field Section 1001 covering each aggregate fraction should be on file in the District Office or received with the JMF. The target gradations shown on the QC plan and JMF must match. When the District is satisfied that the proposed mixture is acceptable, a copy of the JMF and the contractor's letter shall be submitted to the Materials Field Office, accompanied by a letter of transmittal with comments, any corrections made and recommendations. The transmittal letter shall contain the following information:
- Project information – Job Number, Route, County, Contract Number.
- Mixture Type
- Grade and Source of Asphalt Binder
- Letting Date
- Proposed Work – Job Location and Length
- Average Daily Traffic (ADT)
- Mix Use – Mainline, Shoulders, Outer Roads, etc.
- Quantity of Mix
Field Office Procedure
The Materials Field Office is charged with the responsibility of processing the mix formula. General procedures for processing a micro-surfacing mix formula are as follows:
- a. A letter from a District requesting a mix with a copy of the contractor's JMF and letter is received.
- b. Contract specifications for the project are checked for necessary items.
- c. Grade of asphalt as well as the refinery to be used and the percent asphalt recommended are reviewed.
- d. Gradations of the aggregates are checked for specification compliance.
- e. All calculations on the proposed JMF are checked.
- f. For verification, a trial may be prepared and submitted to the Laboratory.
413.1.2.2 Scrub Seal
District Procedure
District procedures are identical to those in micro-surfacing above.
413.1.2.3 Ultra-Thin Bonded Asphalt Wearing Surface
Mix Design Procedure
In order for an Ultrathin Bonded Asphalt Wearing Surface mix formula to be approved, the contractor’s proposed job mix formula (JMF) shall be submitted as required in Standard Specification Sec 413.30.2.5. The time for approval starts when the completed design is delivered to the District. This time restarts when the District receives information omitted from the original JMF or corrected by the contractor. Review/verification time includes District and Central Office processing, therefore, each mix should be processed as soon as possible. Trial mix samples shall be obtained and submitted to the Central Laboratory in accordance with Field Section 1001. When possible, the JMF and correspondence should be transmitted electronically. The Materials Field Office e-mail address is MFO.
District Procedure
District procedures are identical to those in micro-surfacing above.
Field Office Procedure
The Materials Field Office is charged with the responsibility of processing the mix formula. General procedures for processing an ultra thin bonded asphalt wearing surface mix formula are as follows:
- a. A letter from a District requesting a mix with a copy of the contractor's JMF and letter is received.
- b. Contract specifications for the project are checked for necessary items.
- c. Grade of asphalt as well as the refinery to be used and the percent asphalt recommended are reviewed.
- d. Gradations of the aggregates are checked for specification compliance and compared with the gradations determined by the Laboratory.
- e. All calculations on the proposed JMF are checked.
- f. For verification, a trial mix is prepared and submitted to the Laboratory.
- g. When Central Laboratory tests are completed, the results are compared to the contractor’s and against the specifications. If the mixes tested cannot be used, the mixture will be rejected.
413.1.2.4 Bituminous Fog Sealing
District Procedure
District procedures are identical to those in micro-surfacing above.
413.1.2.5 Bituminous Pavement Crack Sealing
District Procedure
District procedures shall be in accordance with the applicable sections of Materials Manual Field Section 1057.
413.1.2.6 Portland Cement Concrete Pavement Joint/Crack Sealing
District Procedure
District procedures shall be in accordance with the applicable sections of Materials Manual Field Section 1057.
413.1.2.7 Bituminous Pavement Crack Filling
District Procedure
District procedures shall be in accordance with the applicable sections of Materials Manual Field Sections 1015 and 1057.
413.1.2.8 Portland Cement Concrete Pavement Crack Filling
District Procedure
District procedures shall be in accordance with the applicable sections of Field Section 1057.
413.1.3 Report
413.1.3.1 Micro-Surfacing
A letter of transmittal will accompany the approved mixture to the district Operations Engineer with distribution as follows:
| Title | Copy of Transmittal Letter and Approved Mix |
|---|---|
| District Operations Engineer | 1 |
| Project Operations Clerk | 1 |
| Resident Engineer | 1 |
| Field Office File | 1 |
The letter of transmittal and the approved mixture will be sent by electronic mail to the individuals listed above.
A copy of the approved formula accompanied by a letter of transmittal from the District Operations Engineer is to be forwarded to the contractor.
413.1.3.2 Ultra-Thin Bonded Asphalt Wearing Surface
Reporting procedures are the same as shown for micro-surfacing.
Articles in "413 Surface Treatments and Preventive Maintenance"
The following 10 pages are in this category, out of 10 total.