SECTION 407 - BINDER RICH INTERMEDIATE COURSE
407.01 Description
This Section describes the requirements for constructing binder rich intermediate course (BRIC).
407.02 Materials
407.02.01 Materials
Provide materials as specified: Tack Coat ................................ ................................ ................................ ................................ ................ 902.01.02 Polymer Modified Emulsified Asphalt, Grade CRS-1P ................................ ................................ ............ 902.01.03 Binder Rich Intermediate Course ................................ ................................ ................................ ................... 902.11 Use an approved HMA surface course to fill core holes, maintaining the material hot enough to compact. The Contractor may use a commercial type of cold mixture as patching material for filling core holes if HMA surface course is not being produced when coring.
407.02.02 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 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.
407.03 Construction
407.03.01 Bric
A.Paving Plan. At least 20 days before the start of placing the BRIC, 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 12 hours before paving the National Weather Service locally forecasts a 40 percent chance or greater of precipitation during the scheduled placement, postpone the placeme nt of BRIC. Do not place BRIC if it is precipitating and do not allow trucks to leave the plant when precipitation is imminent. Do not resume paving operations until the chance of precipitation is less than 40 percent and the surface is dry. Do not pave if the base temperature is below 50 °F.
C.Test Strip. At least 14 days prior to production of BRIC, construct a test strip as specified in 401.03.07.C except for the allowance to continue paving. Ensure that the test strip is at least 100 tons. 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. The Contractor may need to construct multiple test strips in order to produce material that meets both the plant production requirements and the field density requirements as directed by the RE.
D.Transportation and Delivery of HMA. Transport and deliver BRIC as specified in 401.03.07.D.
E.Spreading and Grading. Do not start paving of the BRIC until the RE has approved the underlying surface. Apply tack coat as specified in 401.03.05. Place BRIC at the laydown temperature recommended by the supplier of the asphalt binder or the supplier of the asphalt modifier without exceeding 330 ºF maximum discharge temperature at the HMA plant. Spread and grade BRIC as specified in 401.03.07.E.
F.Compacting. Compact as specified in 401.03.07.F. If vibratory compaction causes aggregate breakdown, forces liquid asphalt to the surface or creates a surface with undesirable ride quality, then 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. Do not allow traffic or construction equipment on the BRIC until the surface temperature is less than 120 °F. Ensure that traffic is not allowed on the BRIC for more than 7 days.
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 500 tons with previou s or subsequent production areas. If a day’s production is greater than 2 ,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. The ME will calculate the percent defective (PD) as the percentage of the lot outside the acceptable range of 0 percent air voids to 6 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 size 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 − 0) S QU = (6.0 − 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 407.03.01-1. Table 407.03.01-1 PPA for BRIC Lots Quality PPA BRIC 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 401.03.07-4.
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 as directed by the RE. 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 as directed by the RE. If the outlier replacement core is not taken within 15 days, the ME will use the initial core results to determine PPA.
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Source: Standard Specifications for Road and Bridge Construction, 2019 (rev. 2022-12-21) Edition. Pages 218–220 of 651. View official source ↗