SPECIAL SPECIFICATION 2013 Roller Integrated Compaction Monitoring (RICM)

Transcription

1 2004 Specifications CSJ May be used only with the approval of CST. SPECIAL SPECIFICATION 2013 Roller Integrated Compaction Monitoring (RICM) 1. Description. Construct subgrade soil (treated or untreated) and flexible base using Roller Integrated Compaction Monitoring (RICM) system. RICM is the recording and color coded real-time display of roller-integrated measurement values (MVs) directly to the roller operator. Roller location is determined by a Real Time Kinematic-Global Positioning System (RTK-GPS). This work shall consist of compacting these materials with a RICM measurement and documentation system. Develop and implement a project specific Quality Control (QC) Plan for material construction that is based on the RICM roller compaction parameters, moisture content, and field measurements of stiffness using a Light Weight Deflectometer (LWD). The use of this Special Specification is intended to use the effective modulus of subgrade reaction (k-value) for Quality Acceptance (QA) in lieu of Density Control in applicable areas for the Items listed in Article 2. Materials. 2. Materials. Furnish uncontaminated materials of uniform quality that meet the requirements of the plans and specifications in accordance with the following: Item 110, Excavation; Item 132, Embankment; Item 247, Flexible Base; Item 251, Reworking Base Courses; Item 260, Lime Treatment (Road-Mixed) and/or Item 263, Lime Treatment (Plant-Mixed). Notify the Construction Quality Acceptance Manager (CQAM) of changes in the in-place material or a proposed change in material source. The CQAM may sample and test project materials at any time throughout the duration of the project to assure specification compliance. Use Tex-100-E for material definitions. 3. Equipment. Furnish machinery, tools, and equipment necessary for proper execution of the work in accordance with the plans and the applicable Specification Items listed in Article 2. Materials. Provide RICM rollers and approved rolling equipment complying with Item 210 Rolling

2 All RICM rollers shall continuously measure and record compaction parameters in an electronic data file whereby falsification of the raw data file is not possible. At a minimum, the following data shall be contained in the measurement pass data files: Machine Model, Type, and Serial/Machine Number Roller Drum Dimensions (Width and Diameter) Roller and Drum Weights File Name Date Stamp Time Stamp RTK based GPS measurements showing Northing, Easting, and Elevation Roller Travel Direction (forward or reverse) Roller Speed Vibration Setting (On or Off) Machine Gear Vibration Amplitude Vibration Frequency Roller Integrated Compaction Monitoring-Measurement Value (RICM-MV) The RICM roller manufacturer shall train project personnel in the proper operation and maintenance of the equipment as well as the collection and analysis for reliable and repeatable measurements. Training will be updated annually and intermittently as needed to ensure all personnel are in compliance with proper RICM operations. Areas of specific training include RICM field operations, data collection, analysis, and quality report development. Submit all training records to the Independent Assurance (IA) Engineer for compliance verification. Provide a RTK-GPS to acquire northing, easting, and elevation data used in mapping of RICM measurements. Furnish a local GPS base station used for broadcasting differential correction data to the rollers with a tolerance less than 0.1 feet in the vertical and horizontal directions. Ensure the system has the capability to continuously collect data at a sampling interval 1.5 feet in an established project coordinate system. 4. Quality Control (QC) Plan. Establish and submit to Construction Division and CQAM the following: Control strip location, rolling pattern, and material(s) description Light Weight Deflectometer (LWD) readings and minimum requirements Moisture content and dry density readings and limits RICM compaction parameters specified under Equipment. RICM plot map and electronic compaction data files acquired from the RICM roller

3 5. Quality Acceptance (QA) Responsibility. CQAM shall evaluate and verify data including: Review RICM-MV maps and quality reports Modulus of subgrade reaction (k-value) readings and minimum requirements Moisture content readings and limits RICM-MVs and requirements 6. Construction. Construct each layer uniformly, free of loose or segregated areas, and provide a smooth compacted surface that conforms to the typical sections, lines, and grades shown on the plans or as directed by the CQAM. Provide the CQAM and the Department access to the software for processing of the compaction data. A. Effective Modulus of Subgrade Reaction (k-value) Requirements. 1. Natural Subgrade. Achieve a minimum k-value of 330 pci for 12-inch diameter plate used on top of natural subgrade layers. This is for both pavement layer acceptance and for use with control strips to establish a rolling pattern. 2. Flexible Base. Achieve a minimum k-value of 462 pci for 30-inch diameter plate on top of flexible base layers prior to placement of pavement surface. 3. Lime-Treated Subgrade. Where the pavement structure is placed directly on lime-treated subgrade without flexible base, the top 12 inches of treated subgrade shall achieve a minimum k-value of 462 pci for 30-inch diameter plate prior to placement of pavement surface. All other areas of treated subgrade shall achieve a minimum k-value of 330 pci for 12-inch diameter plate used on top of natural and treated subgrade layers. B. Preparation of Subgrade or Existing Base. Prepare subgrade or existing base in accordance with the plans and the applicable Specification Items listed in Article 2. Materials. Create a proof map of the finished roadbed and record the roller data using a RICM roller. Provide a visual RICM plot map and electronic compaction data files acquired from the RICM roller to the CQAM the same day the measurements are collected. The RICM plot map will be generated from the RICM roller software and provide a color coded, scaled spatial map of RICM-MVs and roller pass coverage. C. Placing. Spread and shape the materials into a uniform layer in accordance with the plans and the applicable Specification Items listed in Article 2. Materials. D. Pulverization. Pulverize or scarify existing materials in accordance with the plans and the applicable Specification Items listed in Article 2. Materials. E. Application of Additives. Uniformly apply additives in accordance with the plans and the applicable Specification Items listed in Article 2. Materials. and the General Notes

4 F. Mixing. Thoroughly mix the materials with additives in accordance with the plans, and the applicable Specification Items listed in Article 2. Materials. and the General Notes. G. Moisture Content Requirements. Meet the moisture content requirements of the applicable Specification Items listed in Article 2. Materials. H. Compaction. Compact using modulus control unless otherwise shown on the plans. Multiple lifts are permitted when shown on the plans or approved. Do not use tamping rollers or grid rollers. When necessary, sprinkle the material in accordance with Item 204, Sprinkling. Determine the moisture content of the material at the beginning and during compaction in accordance with Tex-115-E. Begin rolling longitudinally at the sides and proceed towards the center, overlapping on successive trips by at least 1/2 the width of the roller. On superelevated curves, begin rolling at the low side and progress toward the high side. Offset alternate trips of the roller. 1. Control Strip. The Developer and CQAM will agree on the location(s) within the project to construct a control strip(s) to establish the rolling pattern necessary to achieve the effective modulus of subgrade reaction (k-value) for each layer. Determine and record moisture content and dry density in accordance with Tex-115-E, Part I. Determine and record the minimum LWD stiffness in accordance with ASTM E Determine and record the k- values in accordance with ASTM D (2004). Use a 12-inch plate for untreated soils or lime treated materials and a 30-inch diameter plate for flexible base material. Record RICM compaction parameters specified under Equipment. Establish correlations between RICM-MV, LWD stiffness, and k-value for QC/QA. Complete at least one control strip to establish a rolling pattern for each layer of material and determine a target RICM-MV. Construct additional control strips when there are changes in the material source, gradation, soil type, layer thickness, or as directed by the CQAM. Leave each control strip in place to become part of the project permanent work. Unless the CQAM approves otherwise, construct the control strip to a minimum length of 150 feet and to the full width of the material course, but not less than 25 feet wide. Limit the compacted lift thickness to 12 inches or less, unless otherwise approved by the CQAM. Use the same RICM roller and procedures for the construction of the remainder of the layers. After a minimum of two passes of the RICM roller, test and record data at 3 points within the control strip area for moisture content, dry density, LWD stiffness and k-value. Mark each test site carefully so that subsequent tests made are in the same location and position. Determine the test locations by evaluating the roller RICM map and selecting the three lowest RICM-MV regions in the control strip area. The test points will be located at least 2 feet from any edge of the compacted area

5 Continue to compact and perform testing on the control strip until the required moisture content and k-value are achieved. Select the observed RICM-MV that obtains the required moisture content and k-value for a minimum of 90% of the control strip area as calculated from the RICM-MV and label as the RICM Target Value (RICM-TV) for the material used to construct the course. To ensure compaction uniformity, the uniformity will be calculated as the standard deviation (SD) of the RICM-MV. The CQAM will verify that the control strip area achieved the required moisture content and k-value by performing or witnessing tests at three random locations. The CQAM will notify the Owner Verification Firm (OVF) to allow a determination if a witness of the testing is required. these pp do not have correct indentation 2. Project Compaction. Compact materials to the RICM-TV and moisture content requirements established from the control strip, unless otherwise indicated on the plans or as directed. Place and compact material in maximum lift thicknesses per the applicable items in Article 2. Materials. Compact each lift until the RICM-MV indicates that a minimum of 90% of the layer area has achieved the RICM-TV minus 1.5 times SD of the RICM-MV. Additionally, local contiguous non-compliance areas not achieving RICM-TV must be no larger than 150 square feet. Provide a visual RICM plot map and electronic compaction data files acquired from the RICM roller, LWD measurements, and moisture content measurements, to the CQAM the same day the measurements are collected. QA will determine soil properties for each lift of each material as identified in Table 1 at the frequency indicated. Table 1 QA Minimum Testing Requirements Layer Property Test Procedure k-value ASTM D 1196 Lime Treated Soil and LWD Stiffness ASTM E 2583 Flexible Base Moisture content Tex-115-E, Pt I k-value ASTM D 1196 Untreated Soil LWD Stiffness ASTM E 2583 Moisture content Tex-115-E, Pt I All RICM-MV Maps In accordance with and Quality Reports Manufacturer Minimum Test Frequency 3 per 10,000 sy 3 per 50,000 sy 1 per 1 sy The CQAM will verify that each area achieves the required moisture content and k-value by performing or witnessing the tests at the required minimum frequencies listed in Table 1. Rework, recompact, and refinish material that fails to meet the applicable Specification Items listed in Article 2. Materials. or that loses required moisture content, stability, or finish before the next course is placed. Continue work until these specification requirements are met

6 a. Finishing. Immediately after completing compaction of the final course, finish the final section in accordance with the plans and the applicable Specification Items listed in Article 2. Materials. b. Curing. Cure the finished section in accordance with the plans and the applicable Specification Items listed in Article 2. Materials. 7. Measurement and Payment. The work performed, materials furnished, equipment, labor, tools, and incidentals will not be measured or paid for directly, but is subsidiary or is included in payment for other bid Items