SECTION 408 – ASPHALT RUBBER GAP GRADED COURSES
408.01 Description
This Section describes the requirements for constructing Asphalt Rubber Gap Graded (ARGG) Surface Course and Asphalt Rubber Gap Graded Intermediate Course.
408.02 Materials
408.02.01 Materials
Provide materials as specified: Tack Coat: Emulsified Asphalt, Grade RS-1, RS-1h, CRS-1, or CRS-1h ................................ ................................ ... 902.01.02 Polymer Modified Emulsified Asphalt, Grade CRS-1P................................ ................................ ............ 902.01.03 Asphalt Rubber Gap Graded Course ................................ ................................ ................................ ............. 902.12 Polymerized Joint Adhesive ................................ ................................ ................................ ......................... 914.03
408.02.02 Equipment
Provide equipment as specified: Materials Transfer Vehicle (MTV) ................................ ................................ ................................ .............. 1003.01 HMA Paver ................................ ................................ ................................ ................................ ................. 1003.03 HMA Compactor ................................ ................................ ................................ ................................ ........ 1003.05 Bituminous Material Distributor ................................ ................................ ................................ .................. 1003.07 HMA Plant................................ ................................ ................................ ................................ .................. 1009.01 HMA Trucks ................................ ................................ ................................ ................................ ............... 1009.02 Asphalt-Rubber Binder Blending Equipment ................................ ................................ ............................... 1009.03 Provide a thin-lift nuclear density gauge according to ASTM D 2950. NOTE: A Spray Paver as specified in 1003.04 may be used in lieu of a HMA Paver.
408.03 Construction
408.03.01 ARGG Course
A.Paving Plan. At least 20 days before beginning placing the ARGG course, submit to the RE for approval a detailed plan of operation as specified in 401.03.07.A. Include in the paving plan a proposed location for the test strip.
B.Weather Limitations. If within the 12 hours before paving, the National Weather Service locally forecasts a 50 percent chance or greater of precipitation during the scheduled placement, postpone the placement of ARGG course. Do not place ARGG course if it is precipitating and do not allow trucks to leave the plant when precipitation is imminent. The Contractor may resume paving operations when the chance of precipitation is less than 50 percent and the surface is dry. Do not pave if the surface temperature of the underlying pavement is below 50 °F.
C.Test Strip. Construct a test strip as specified in 401.03.07.C except for the allowance to continue paving. Submit test strip results to the RE. The RE will analyze the test strip results in conjunction with the ME’s results from the HMA plant to approve the test strip. Do not proceed with production paving until receiving written permission from the RE.
D.Transportation and Delivery of ARGG Course. Transport and deliver ARGG course as specified in 401.03.07.D.
F.Compacting. Compact ARGG course as specified in 401.03.07.F, but use a minimum of 3 rollers and ensure fabric softener is added to the roller water to prevent material pick -up on the roller drum. One pint of fabric softener per fill-up of the roller water has been shown to be adequate in preventing material pick-up. Ensure that the compaction is completed before the mix cools down to 240 °F. If vibratory compaction causes aggregate breakdown or forces liquid asphalt binder to the surface, operate rollers in static mode only.
G.Opening to Traffic. Remove loose material from the traveled way, shoulder, and auxiliary lanes before opening to traffic. Before opening ARGG course to traffic or construction equipment, ensure that the lime water has been applied, the surface is tack free and the surface temperature is less than 140 °F.
H.Air Void Requirements. Drill cores as specified in 401.03.08. Mainline lots are defined as the area covered by a day’s paving production of the same job mix formula for the traveled way and auxiliary lanes. The RE may combine daily production areas less than 1,000 tons with previous or subsequent production areas. If a day’s production is greater than 4,000 tons, the RE may divide the area of HMA placed into 2 lots with approximately equal areas. Ramp pavement lots are defined as approximately 10,000 square yards of pavement in ramps. The RE may combine ramps with less than the minimum area into a single lot. If 2 or more ramps are included in a single lot, the RE will require additional cores to ensure that at least 1 core is taken from each ramp. Other pavement lots are defined as approximately 10,000 square yards of pavement in shoulders and other undefined areas. Inside shoulders less than 6 feet in width will not be included in other lots unless requested by the RE. If areas of existing shoulders are found to be insufficient to support the proposed HMA pavement and the required compaction cannot be achieved, notify the RE immediately. The RE may either direct additional milling and paving to provide a suitable base to pave the proposed HMA, or waive coring and air void requirements in such shoulder areas. The ME will calculate the percent defective (PD) as the percentage of the lot outside the acceptable range of 1 percent air voids to 7 percent air voids. The acceptable quality limit is 10 percent defective. For lots in which PD < 10, the Department will award a positive pay adjustment. For lots in which PD > 10, the Department will assess a negative pay adjustment. The ME will determine air voids from 5 cores taken from each lot in random locations. The ME will determine air voids of cores from the values for the maximum specific gravity of the mix and the bulk specific gravity of the core. The ME will determine the maximum specific gravity of the mix according to NJDOT B-3 and AASHTO T 209, except that minimum sample siz e may be waived in order to use a 6 inch diameter core sample. The ME will determine the bulk specific gravity of the compacted mixture by testing each core according to AASHTO T 166. The ME will calculate pay adjustments based on the following:
1.Sample Mean (X̅ ) and Standard Deviation (S) of the N Test Results (X 1, X2,..., XN). Calculate using the formula as specified in 401.03.07.H.1.
2.Quality Index (Q). QL = (X̅ − 1.0) S QU = (7.0 − X̅) S
3.Percent Defective (PD). Using NJDOT ST for the appropriate sample size, the Department will determine PDL and PDU associated with QL and QU, respectively. PD = PDL + PDU
4.Percent Pay Adjustment (PPA). Calculate the PPA for traveled way and ramp lots as sp ecified in Table 408.03.01-1. Table 408.03.01-1 PPA for Mainline Lots and Ramp Lots Quality PPA Surface PD 10 PPA = 4 − (0.4 PD) 10 PD 30 PPA = 1 − (0.1 PD) PD 30 PPA = 40 − (1.4 PD) Intermediate and Base PD 30 PPA = 1 − (0.1 PD) PD 30 PPA = 40 − (1.4 PD) Calculate the PPA for other pavement lots as specified in Table 408.03.01-2. Table 408.03.01-2 PPA for Other Pavement Lots Quality PPA All Courses PD 50 PPA = 1 − (0.1 PD) PD 50 PPA = 92 − (1.92 PD)
5.Outlier Detection. If PD < 10, the ME will not screen for outliers. If PD ≥ 10, the ME will screen all acceptance cores for outliers using a statistically valid procedure. The following procedure applies only for a sample size of 5 or 10.
1.The ME will arrange the core results in ascending order, in which X1 represents the smallest value and XN represents the largest value.
2.If XN is suspected of being an outlier, the ME will calculate: R = XN − X(N−1) XN − X1
3.If X1 is suspected of being an outlier, the ME will calculate: R = X2 − X1 XN − X1
4.For N = 5 if R > 0.642, the value is judged to be statistically significant and the core is excluded. For N = 10 if R > 0.412, the value is judged to be statistically significant and the core is excluded. If an outlier is detected for N = 5, and no retest is warranted, the Contractor may replace that core by taking an additional core at the same offset and within 5 feet of the original station. If an outlier is detected and a retest is justified, take a replacement core for the outlier at the same time as the 5 additional retest cores are taken. If the outlier replacement core is not taken within 15 days, the ME will use the initial core results to determine PPA. If an outlier is detected for N = 10, the Contractor may replace that core by taking an additional core at the same offset and within 5 feet of the original station. If the outlier replacement core is not taken within 15 days, the ME will use the initial core results to determine PPA.
6.Retest. If the initial series of 5 cores produces a percent defective value of PD 30 for mainline or ramp lots, or PD 50 for other pavement lots, the Contractor may elect to take an additional set of 5 cores at random locations chosen by the ME. Notify the RE within 15 days o f receipt of the initial core results to take the additional cores. If the RE is not notified within the 15 days, the ME will use the initial core results to determine the PPA. If the additional cores are taken, the ME will recalculate the PPA using the combined results from the 10 cores.
7.Removal and Replacement. If the final lot PD 75 (based on the combined set of 10 cores or 5 cores if the Contractor does not take additional cores), remove and replace the lot and all overlying work. The replacement work is subject to the same requirements as the initial work.
J.Ride Quality Requirements. The Department will evaluate the ARGG course as specified in 401.03.07.J.
408.04 Measurement and Payment
Item Pay Unit ASPHALT RUBBER GAP GRADED SURFACE COURSE TON ASPHALT RUBBER GAP GRADED INTERMEDIATE COURSE TON The Department will measure ASPHALT RUBBER GAP GRADED SURFACE COURSE and ASPHALT RUBBER GAP GRADED INTERMEDIATE COURSE by the ton as indicated on the certified weigh tickets, excluding unused material. The Department will make payment for CORE SAMPLES, HOT MIX ASPHALT as specified in 401.04. The Department will make payment for POLYMERIZED JOINT ADHESIVE as specified in 401.04. The Department will make payment for TACK COAT as specified in 401.04. The Department will make payment for POLYMER MODIFIED TACK COAT as specified in 401.04.
Referenced in this section
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Source: Standard Specifications for Road and Bridge Construction, 2019 (rev. 2022-12-21) Edition. Pages 221–224 of 651. View official source ↗