1、*USACE / NAVFAC / AFCESA / NASA UFGS-32 13 17 (April 2008)-Preparing Activity: USACE SupersedingUFGS-32 13 17 (January 2007)UNIFIED FACILITIES GUIDE SPECIFICATIONSReferences are in agreement with UMRL dated March 2008*SECTION TABLE OF CONTENTSDIVISION 32 - EXTERIOR IMPROVEMENTSSECTION 32 13 17STONE
2、MATRIX ASPHALT (SMA) FOR AIRFIELD PAVEMENTS04/08PART 1 GENERAL1.1 METHOD OF MEASUREMENT1.2 BASIS OF PAYMENT1.3 PERCENT PAYMENT1.3.1 Mat and Joint Densities1.3.2 Pay Factor Based on In-Place Density1.3.3 Payment Adjustment for Smoothness1.3.4 Laboratory Air Voids and Theoretical Maximum Density1.3.5
3、Mean Absolute Deviation1.3.6 Pay Adjustment Based on Grade1.4 REFERENCES1.5 SYSTEM DESCRIPTION1.5.1 Truck Scales1.5.2 Testing Facilities1.5.3 Inspection of Plant1.5.4 Storage Bins1.5.5 Hauling Equipment1.5.6 Asphalt Pavers1.5.6.1 Receiving Hopper1.5.6.2 Automatic Grade Screed Controls1.5.7 Rollers1.
4、6 SUBMITTALS1.7 QUALITY ASSURANCE1.7.1 Sublot Sampling1.7.2 Additional Smpling and Testing1.7.3 In-Place Density1.7.4 Surface Smoothness1.7.5 Smoothness Requirements1.7.6 Testing Method1.8 ENVIRONMENTAL REQUIREMENTSPART 2 PRODUCTS2.1 AGGREGATES2.1.1 Coarse AggregateSECTION 32 13 17 Page 1Provided by
5、 IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2.1.2 Fine Aggregate2.1.3 Mineral Filler2.1.4 Aggregate Gradation2.1.5 Fiber Stabilizer2.2 ASPHALT CEMENT BINDER2.3 MIX DESIGN2.3.1 JMF Requirements2.3.2 Adjustments to JMFPART 3 EXECUTION3.1 CONTRACTOR QUALITY CO
6、NTROL3.1.1 General Requirements3.1.2 Testing Laboratory3.1.3 Quality Control Testing3.1.3.1 Asphalt Content3.1.3.2 Gradation and Specific Gravity3.1.3.3 Temperatures3.1.3.4 Moisture Contents3.1.3.5 Laboratory Air Voids3.1.3.6 In-Place Density3.1.3.7 Grade and Smoothness3.1.3.8 Additional Testing3.1.
7、3.9 QC Monitoring3.1.4 Sampling3.1.5 Control Charts3.2 PREPARATION OF ASPHALT BINDER MATERIAL3.3 PREPARATION OF MINERAL AGGREGATE3.4 PREPARATION OF STONE MATRIX ASPHALT MIXTURE3.5 PREPARATION OF THE UNDERLYING SURFACE3.6 TEST SECTION3.6.1 Sampling and Testing for Test Section3.6.2 Additional Test Se
8、ctions3.7 TESTING LABORATORY3.8 TRANSPORTING AND PLACING3.8.1 Transporting3.8.2 Placing3.9 COMPACTION OF MIXTURE3.10 JOINTS3.10.1 Transverse Joints3.10.2 Longitudinal Joints- End of Section Table of Contents -SECTION 32 13 17 Page 2Provided by IHSNot for ResaleNo reproduction or networking permitted
9、 without license from IHS-,-,-*USACE / NAVFAC / AFCESA / NASA UFGS-32 13 17 (April 2008)-Preparing Activity: USACE SupersedingUFGS-32 13 17 (January 2007)UNIFIED FACILITIES GUIDE SPECIFICATIONSReferences are in agreement with UMRL dated March 2008*SECTION 32 13 17STONE MATRIX ASPHALT (SMA) FOR AIRFI
10、ELD PAVEMENTS04/08*NOTE: This guide specification covers the requirements for stone matrix asphalt (SMA) for both heavy duty roadway and airfield pavements.Edit this guide specification for project specific requirements by adding, deleting, or revising text. For bracketed items, choose applicable it
11、ems(s) or insert appropriate information.Remove information and requirements not required in respective project, whether or not brackets are present.Comments and suggestions on this guide specification are welcome and should be directed to the technical proponent of the specification. A listing of t
12、echnical proponents, including their organization designation and telephone number, is on the Internet.Recommended changes to a UFGS should be submitted as a Criteria Change Request (CCR).*PART 1 GENERAL*NOTE: This guide specification only pertains to the stone matrix asphalt aspects of the project
13、and not to any surface preparation requirements dealing with aggregate base courses, milling, or tack or prime coats. Surface preparation requirements should be covered by either including them in this guide specification or by adding pertinent sections to the project documents.SMA can be used as a
14、surface course for any airfield pavement. SMA provides increased durability, resistance to rutting, resistance to reflective cracking over HMA. Local state highway experiences with SMA should be considered when developing the SECTION 32 13 17 Page 3Provided by IHSNot for ResaleNo reproduction or net
15、working permitted without license from IHS-,-,-job specification.This specification utilizes a Quality Assurance and Quality Control (QA/QC) construction management philosophy. Quality Assurance refers to the actions performed by the Government or designated representative Engineer to assure the fin
16、al product meets the job requirements. Results of QA testing are the basis for pay. Quality Control refers to the actions of the Contractor to monitor the construction and production processes and to correct these processes when out of control. Results of QC testing are reported daily on the process
17、 control charts maintained by the Contractor. Quality Control is covered in paragraph CONTRACTOR QUALITY CONTROL.*1.1 METHOD OF MEASUREMENT*NOTE: For unit-price contracts, include first bracketed statements and delete the second set. For lump-sum contracts, delete the first bracketed statements and
18、include the second set. Lump-sum contracts should not be used when the job exceeds 1000 metric tons (1000 short tons).*The amount paid for will be the number of metric short tons of SMA used in the accepted work. Weigh the SMA after mixing, and no adjustment will be made for weight of asphalt cement
19、 material incorporated herein. The measured quantity will be divided by the mix adjustment factor (MAF) to determine the pay quantity. The MAF equals the maximum theoretical specific gravity from the JMF divided by 2.500. If the MAF calculation results in a value less than or equal to 1.020 and grea
20、ter than or equal to 0.98, then the MAF shall be considered to be 1.000. If the calculated MAF is outside the range, then the actual calculated value shall be used.Measurement of the quantity of SMA, per metric short ton placed and accepted, shall be made for the purposes of assessing the pay factor
21、s stipulated in this section.1.2 BASIS OF PAYMENT*NOTE: For unit-price contracts, include first bracketed statements and delete the second set. For lump-sum contracts, delete the first bracketed statements and include the second set. Include prescriptive unit price based on the Government/Engineer e
22、stimate for payment adjustment. Lump-sum contracts should not be used when the job exceeds 1000 metric tons (1000 tons).*Quantities of SMA mixture, determined as specified above, will be paid for at respective contract unit prices or at reduced prices adjusted in accordance with paragraphs PERCENT P
23、AYMENT and QUALITY ASSURANCE. Payment will constitute full compensation for furnishing all materials, equipment, SECTION 32 13 17 Page 4Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-plant, and tools; and for all labor and other incidentals necessar
24、y to complete work required by this section of the specification.The measured quantity of SMA will be paid for and included in the lump-sum contract price. If less than 100 percent payment is due based on the pay factors stipulated in paragraph QUALITY ASSURANCE, a unit price of _ per ton will be us
25、ed for purposes of calculating the payment reduction.1.3 PERCENT PAYMENTWhen a lot of material fails to meet the specification requirements for 100 percent pay as outlined in the following paragraphs, that lot shall be removed and replaced, or accepted at a reduced price which will be computed by mu
26、ltiplying the unit price by the lot pay factor. The lot pay factor is determined by taking the lowest computed pay factor based on either laboratory air voids, in place density, grade or smoothness (each discussed below). Pay factors based on different criteria (i.e., laboratory air voids and in pla
27、ce density) of the same lot will not be multiplied together to get a lower lot pay factor. At the end of the project, an average of all lot pay factors will be calculated. If this average lot pay factor exceeds 95.0 percent, then the percent payment for the entire project will be 100 percent of the
28、unit bid price. If the average lot pay factor is less than 95.0 percent, then each lot will be paid for at the unit price multiplied by that lots pay factor. For any lots which are less than 2000 metric 2000 pound tons, a weighted lot pay factor will be used to calculate the average lot pay factor.1
29、.3.1 Mat and Joint DensitiesThe average in place mat and joint densities are expressed as a percentage of the average maximum theoretical density for the lot. The maximum theoretical density for each lot will be determined as the average maximum theoretical density of the two random samples per lot.
30、 The average in place mat density and joint density for a lot are determined and compared with Table 1 to calculate a single pay factor per lot based on in place density, as described below. First, a pay factor for both mat density and joint density are determined from Table 1. The area associated w
31、ith the joint is then determined and will be considered to be 3 meters 10 feet wide times the length of completed longitudinal construction joint in the lot. This area will not exceed the total lot size. The length of joint to be considered will be that length where a new lane has been placed agains
32、t an adjacent lane of SMA pavement, either an adjacent freshly paved lane or one paved at any time previously. The area associated with the joint is expressed as a percentage of the total lot area. A weighted pay factor for the joint is determined based on this percentage (see example below). The pa
33、y factor for mat density and the weighted pay factor for joint density are compared and the lowest selected. This selected pay factor is the pay factor based on density for the lot. When the maximum theoretical density on both sides of a longitudinal joint is different, the average of these two dens
34、ities will be used as the maximum theoretical density needed to calculate the percent joint density. All density results for a lot will be completed and reported within 24 hours after the construction of that lot.Table 1 Pay Factor Based on In-Place DensityAverage Mat Density Pay Factor, Average Joi
35、nt Density(4 Cores) Percent (4 Cores)94.0 or 96.0 100.0 above 92.593.9 100.0 92.4SECTION 32 13 17 Page 5Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Table 1 Pay Factor Based on In-Place DensityAverage Mat Density Pay Factor, Average Joint Density(
36、4 Cores) Percent (4 Cores)93.8 or 96.1 99.9 92.393.7 99.8 92.293.6 or 96.2 99.6 92.193.5 99.4 92.093.4 or 96.3 99.1 91.993.3 98.7 91.893.2 or 96.4 98.3 91.793.1 97.8 91.693.0 or 96.5 97.3 91.592.9 96.3 91.492.8 or 96.6 94.1 91.392.7 92.2 91.292.6 or 96.7 90.3 91.192.5 87.9 91.092.4 or 96.8 85.7 90.9
37、92.3 83.3 90.892.2 or 96.9 80.6 90.792.1 78.0 90.692.0 or 97.0 75.0 90.5below 92.0, above 101.0 0.0 (reject) below 90.51.3.2 Pay Factor Based on In-Place DensityAn example of the computation of a pay factor (in inch-pound units only) based on in place density, is as follows: Assume the following tes
38、t results for field density made on the lot: (1) Average mat density = 93.2 percent (of maximum theoretical density), (2) Average joint density = 91.0 percent (of maximum theoretical density), (3) Total area of lot = 30,000 square feet, (4) Length of completed longitudinal construction joint = 2000
39、feet.a. Step 1: Determine pay factor based on mat density and on joint density, using Table 1:Mat density of 93.2 percent = 98.3 pay factorJoint density of 91.5 percent = 97.3 pay factorb. Step 2: Determine ratio of joint area (length of longitudinal joint x 10 ft) to mat area (total paved area in t
40、he lot): Multiply the length of completed longitudinal construction joint by the specified 10 ft width and divide by the mat area (total paved area in the lot).(2000 ft. x 10 ft)/30000 sq ft = 0.6667 ratio of joint area to mat area (ratio)c. Step 3: Weighted pay factor (wpf) for joint is determined
41、as indicated below:wpf = joint pay factor + (100 - joint pay factor) (1 - ratio) wpf = 97.3 + (100-97.3) (1-0.6667) = 98.2 percentd. Step 4: Compare weighted pay factor for joint density to pay factor for mat density and select the smaller:SECTION 32 13 17 Page 6Provided by IHSNot for ResaleNo repro
42、duction or networking permitted without license from IHS-,-,-Pay factor for mat density: 98.3 percent. Weighted pay factor for joint density: 98.2 percent.Select the smaller of the two values as pay factor based on density: 98.2 percent.1.3.3 Payment Adjustment for Smoothnessa. Straightedge Testing.
43、 Location and deviation from straightedge for all measurements shall be recorded. When between 5.0 and 10.0 percent of all measurements made within a lot exceed the tolerance specified in paragraph Smoothness Requirements below, after any reduction of high spots or removal and replacement, the compu
44、ted pay factor for that lot based on surface smoothness, will be 95 percent. When more than 10.0 percent of all measurements exceed the tolerance, the computed pay factor will be 90 percent. When between 15.0 and 20.0 percent of all measurements exceed the tolerance, the computed pay factor will be 75 percent. When 20.0 percent or more of th
