1、*USACE / NAVFAC / AFCESA / NASA UFGS-32 12 15.13 (November 2012)-Preparing Activity: USACE SupersedingUFGS-32 12 15 (August 2011)UNIFIED FACILITIES GUIDE SPECIFICATIONSReferences are in agreement with UMRL dated October 2012*SECTION TABLE OF CONTENTSDIVISION 32 - EXTERIOR IMPROVEMENTSSECTION 32 12 1
2、5.13HOT-MIX ASPHALT AIRFIELD PAVING11/12PART 1 GENERAL1.1 FULL PAYMENT1.1.1 Method of Measurement1.1.2 Basis of Payment1.2 PERCENT PAYMENT1.2.1 Mat and Joint Densities1.2.2 Pay Factor Based on In-place Density1.2.3 Payment Adjustment for Smoothness1.2.4 Laboratory Air Voids and Theoretical Maximum D
3、ensity1.2.5 Mean Absolute Deviation1.2.6 Pay Adjustment Based on Grade1.3 REFERENCES1.4 SYSTEM DESCRIPTION1.4.1 Asphalt Mixing Plant1.4.2 Hauling Equipment1.4.3 Material Transfer Vehicle (MTV)1.4.4 Asphalt Pavers1.4.4.1 Receiving Hopper1.4.4.2 Automatic Grade Controls1.4.5 Rollers1.5 SUBMITTALS1.6 Q
4、UALITY ASSURANCE1.6.1 Sublot Sampling1.6.2 Additional Sampling and Testing1.6.3 In-place Density1.6.4 Surface Smoothness1.6.4.1 Smoothness Requirements1.6.4.2 Testing Method1.7 ENVIRONMENTAL REQUIREMENTSPART 2 PRODUCTS2.1 AGGREGATES2.1.1 Coarse AggregateSECTION 32 12 15.13 Page 1Provided by IHSNot f
5、or ResaleNo reproduction or networking permitted without license from IHS-,-,-2.1.2 Fine Aggregate2.1.3 Mineral Filler2.1.4 Aggregate Gradation2.2 ASPHALT CEMENT BINDER2.3 MIX DESIGN2.3.1 JMF Requirements2.3.2 Adjustments to JMF2.4 RECYCLED HOT MIX ASPHALT2.4.1 RAP Aggregates and Asphalt Cement2.4.2
6、 RAP MixPART 3 EXECUTION3.1 CONTRACTOR QUALITY CONTROL3.1.1 General Quality Control Requirements3.1.2 Testing Laboratory3.1.3 Quality Control Testing3.1.3.1 Asphalt Content3.1.3.2 Aggregate Properties3.1.3.3 Temperatures3.1.3.4 Aggregate Moisture3.1.3.5 Moisture Content of Mixture3.1.3.6 Laboratory
7、Air Voids, VMA, Marshall Stability and Flow3.1.3.7 In-Place Density3.1.3.8 Grade and Smoothness3.1.3.9 Additional Testing3.1.3.10 QC Monitoring3.1.4 Sampling3.1.5 Control Charts3.2 PREPARATION OF ASPHALT BINDER MATERIAL3.3 PREPARATION OF MINERAL AGGREGATE3.4 PREPARATION OF HOT-MIX ASPHALT MIXTURE3.5
8、 PREPARATION OF THE UNDERLYING SURFACE3.6 TEST SECTION3.6.1 Sampling and Testing for Test Section3.6.2 Additional Test Sections3.7 TESTING LABORATORY3.8 TRANSPORTING AND PLACING3.8.1 Transporting3.8.2 Placing3.9 COMPACTION OF MIXTURE3.9.1 General3.9.2 Segregation3.10 JOINTS3.10.1 Transverse Joints3.
9、10.2 Longitudinal Joints3.10.3 HMA-Portland Cement Concrete Joints- End of Section Table of Contents -SECTION 32 12 15.13 Page 2Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-*USACE / NAVFAC / AFCESA / NASA UFGS-32 12 15.13 (November 2012)-Preparing
10、 Activity: USACE SupersedingUFGS-32 12 15 (August 2011)UNIFIED FACILITIES GUIDE SPECIFICATIONSReferences are in agreement with UMRL dated October 2012*SECTION 32 12 15.13HOT-MIX ASPHALT AIRFIELD PAVING11/12*NOTE: This guide specification covers the requirements for bituminous intermediate and wearin
11、g courses (central-plant hot-mix) for airfields using Marshall or Gyratory compaction method.Adhere to UFC 1-300-02 Unified Facilities Guide Specifications (UFGS) Format Standard when editing this guide specification or preparing new project specification sections. Edit this guide specification for
12、project specific requirements by adding, deleting, or revising text. For bracketed items, choose applicable items(s) or insert appropriate information.Remove information and requirements not required in respective project, whether or not brackets are present. Do not edit or rewrite the unbracketed t
13、ext without the express consent of the Corps of Engineers Transportation Systems Center (TSMCX), the Air Force major command (MAJCOM) paving engineers, or the Naval Facilities Engineering Command (NAVFAC).Comments, suggestions and recommended changes for this guide specification are welcome and shou
14、ld be submitted as a Criteria Change Request (CCR).*PART 1 GENERAL*NOTE: Modifications must be made to this guide specification during conversion to a project specification in accordance with the NOTES which are located throughout the document. These NOTES are instructions to the designer, and will
15、not appear in the project specification.This guide specification only pertains to the hot-mix asphalt aspects of the project and not to SECTION 32 12 15.13 Page 3Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-any surface preparation requirements dea
16、ling with aggregate base courses, milling, or tack and 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.This specification utilizes a Quality Assurance and Quality Control (QA
17、/QC) construction management philosophy. Quality Assurance refers to the actions performed by the Government or designated representative Engineer to assure the final product meets the job requirements (see paragraph QUALITY ASSURANCE). Results of QA testing are the basis for pay. Quality Control re
18、fers 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 control charts maintained by the Contractor. Quality Control is covered in paragraph CONTRACTOR QUALI
19、TY CONTROL.*1.1 FULL PAYMENT1.1.1 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 include the second set. Lump-sum contracts should not be used when the job exceeds 1
20、000 metric tons (tons).*The amount paid for will be the number of metric short tons of hot-mix asphalt mixture used in the accepted work. Hot-mix asphalt mixture shall be weighed after mixing, and no separate payment will be made for weight of asphalt cement material incorporated herein. Measurement
21、 of the quantity of hot-mix asphalt, per ton placed and accepted, shall be made for the purposes of assessing the pay factors stipulated below.1.1.2 Basis of Payment*NOTE: For unit-price contracts, include first bracketed statements and delete the second set. For lump-sum contracts, delete the first
22、 bracketed statements and include the second set. Include prescriptive unit price based on the Government/Engineer estimate for payment adjustment. Lump-sum contracts should not be used when the job exceeds 1000 metric tons (tons).*Quantities of hot-mix asphalt, determined as specified above, will b
23、e paid for at respective contract unit prices or at reduced prices adjusted in accordance with paragraphs PERCENT PAYMENT and QUALITY ASSURANCE. Payment SECTION 32 12 15.13 Page 4Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-will constitute full co
24、mpensation for furnishing all materials, equipment, plant, and tools; and for all labor and other incidentals necessary to complete work required by this section of the specification. The measured quantity of hot-mixed asphalt will be paid for and included in the lump-sum contract price. If less tha
25、n 100 percent payment is due based on the pay factors stipulated in paragraph QUALITY ASSURANCE, a unit price of _ per ton will be used for purposes of calculating the payment reduction.1.2 PERCENT PAYMENTWhen a lot of material fails to meet the specification requirements for 100 percent pay as outl
26、ined in the following paragraphs, that lot shall be removed and replaced, or accepted at a reduced price which will be computed by multiplying the unit price by the lots pay factor. The lot pay factor is determined by taking the lowest computed pay factor based on either laboratory air voids, in-pla
27、ce density, grade or smoothness (each discussed below). Pay factors based on different criteria (i.e., laboratory air voids and in-place 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 calcul
28、ated. If this average lot pay factor exceeds 95.0 percent and no individual lot has a pay factor less than 75.1 percent, then the percent payment for the entire project will be 100 percent of the unit bid price. If the average lot pay factor is less than 95.0 percent, then each lot will be paid for
29、at the unit price multiplied by the lots pay factor. For any lots which are less than 2000 metric shorttons, a weighted lot pay factor will be used to calculate the average lot pay factor.1.2.1 Mat and Joint DensitiesThe average in-place mat and joint densities are expressed as a percentage of the a
30、verage theoretical maximum density (TMD) for the lot. The average TMD for each lot will be determined as the average TMD of the two random samples per lot. 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 b
31、ased 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 with the joint is then determined and will be considered to be 3 m 10 feet wide times the length of completed longitudinal construction joint in t
32、he 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 against an adjacent lane of hot-mix asphalt pavement, either an adjacent freshly paved lane or one paved at any time previously. The area associated with th
33、e 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 pay factor for mat density and the weighted pay factor for joint density is compared and the lowest selected. This selected pay factor is th
34、e pay factor based on density for the lot. When the TMD on both sides of a longitudinal joint is different, the average of these two TMD will be used as the TMD needed to calculate the percent joint density. Rejected lots shall be removed and replaced. Rejected areas adjacent to longitudinal joints
35、shall be removed 100 mm 4 inches into the cold (existing) lane. All density results for a lot will be completed and reported within 24 hours after the construction of that lot.SECTION 32 12 15.13 Page 5Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
36、Table 1. Pay Factor Based on In-place DensityAverage Mat Density (4cores)Pay Factor, percent Average Joint Density(4 cores)94.0 - 96.0 100.0 Above 92.593.9 100.0 92.493.8 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
37、 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 90.992.3 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 97.0 0.0 (reject) below 90.51.2.2 Pay Factor Based on In-place Density
38、An example of the computation of a pay factor (in I-P units only) based on in-place density, is as follows: Assume the following test results for field density made on the lot: (1) Average mat density = 93.2 percent (of lab TMD). (2) Average joint density = 91.5 percent (of lab TMD). (3) SECTION 32
39、12 15.13 Page 6Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Total area of lot = 30,000 square feet. (4) Length of completed longitudinal construction joint = 2000 feet.a. Step 1: Determine pay factor based on mat density and on joint density, usin
40、g Table 1:Mat density of 93.2 percent = 98.3 pay factor.Joint density of 91.5 percent = 97.3 pay factor.b. Step 2: Determine ratio of joint area (length of longitudinal joint x 10 ft) to mat area (total paved area in the lot): Multiply the length of completed longitudinal construction joint by the s
41、pecified 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 as indicated below:wpf = joint pay factor + (100 - joint pay factor) (1 - rati
42、o) wpf = 97.3 + (100-97.3) (1-.6667) = 98.2 percentd. Step 4: Compare weighted pay factor for joint density to pay factor for mat density and select the smaller:Pay factor for mat density: 98.3 percent. Weighted pay factor for joint density: 98.2 percentSelect the smaller of the two values as pay fa
43、ctor based on density: 98.2 percent1.2.3 Payment Adjustment for Smoothnessa. Straightedge Testing. 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 Smoo
44、thness Requirements below, after any reduction of high spots or removal and replacement, the computed 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 betwee
45、n 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 the measurements exceed the tolerance, the lot shall be removed and replaced at no additional cost to the Government/Owner. Regardless of the above, any small individual area with surface deviation which exceeds the tolerance given above by more than 50 percent, shall be corrected by diamond grinding to meet the specification requirements above or shall be removed and replaced at no additional cost to the Government/
