02786Open-Graded Surface Course (Ogsc)

OPEN-GRADED SURFACE COURSE (OGSC)

PART 1 GENERAL

1.1SECTION INCLUDES

1.2RELATED SECTIONS

1.3REFERENCES

Aggregate by Abrasion and Impact in the Los Angeles Machine

Magnesium Sulfate

the Sand Equivalent Test

Tester

Open-Graded Surface Course (OGSC)

Wheel

Mixtures by the Ignition Method

Aggregate

1.4DEFINITIONS

1.5SUBMITTALS

Instruction, Section 954.

changes and to readjust the quantity of asphalt binder to be used.

1.6ACCEPTANCE

Minimum Sampling and Testing Requirements.

samples, except when only three samples can be taken.

sampling not more than 15 minutes before sampling.

testing as required.

Open-Graded Surface Course (OGSC)

value for Gradation/Asphalt Content. The Engineer computes the Incentives/Disincentives as follows for each lot

according to Table 1.

computation using Tables 2, 3, and 4.

sieves) and asphalt binder content for calculating the gradation/asphalt binder content incentive/disincentive.

necessary.

according to Section 02701.

percent as shown in Table 1.

shown in Table 1.

price reduction of 35 percent for the binder pay item will be assessed.

Open-Graded Surface Course (OGSC)

Table 1 Incentive/Disincentive for Asphalt Binder Content PT Based on Min. Four Samples Incentive/Disincentive (Dollars/Ton) >99 2.00 96-99 1.50 92-95 1.00 88-91 0.00 84-87 -0.26 80-83 -0.60 76-79 -0.93 72-75 -1.27 68-71 -1.60 64-67 -1.93 60-63 -2.27 <60 Reject Incentive/Disincentive for Gradation PT Based on Min. Four Samples Incentive/Disincentive (Dollars/Ton) >99 2.00 96-99 1.50 92-95 1.00 88-91 0.00 84-87 -0.26 80-83 -0.60 76-79 -0.93 72-75 -1.27 68-71 -1.60 64-67 -1.93 60-63 -2.27 56-59 -5.00 52-55 -10.00 <52 Reject

Table 2 Upper and Lower Limit Determination Parameter UL and LL Asphalt Binder Content Target Value ± 0.35% ⅜ inch sieve Target Value ± 6.0% No. 4 sieve Target Value ± 6.0% No. 8 sieve Target Value ± 5.0% No. 200 sieve Target Value ± 2.0%

Open-Graded Surface Course (OGSC)

Table 3 Quality Index Values for Estimating Percent Within Limits PU/PL n=3 n=4 n=5 n=6 n=7 n=8 n=10 n=12 N=15 n=20 100 1.16 1.50 1.75 1.91 2.06 2.15 2.29 2.35 2.47 2.56 99 1.16 1.47 1.68 1.79 1.89 1.95 2.04 2.09 2.14 2.19 98 1.15 1.44 1.61 1.70 1.77 1.80 1.86 1.89 1.93 1.97 97 1.15 1.41 1.55 1.62 1.67 1.69 1.74 1.77 1.80 1.82 96 1.15 1.38 1.49 1.55 1.59 1.61 1.64 1.66 1.69 1.70 95 1.14 1.35 1.45 1.49 1.52 1.54 1.56 1.57 1.59 1.61 94 1.13 1.32 1.40 1.44 1.46 1.47 1.49 1.50 1.51 1.53 93 1.12 1.29 1.36 1.38 1.40 1.41 1.43 1.43 1.44 1.46 92 1.11 1.26 1.31 1.33 1.35 1.36 1.37 1.37 1.38 1.39 91 1.10 1.23 1.27 1.29 1.30 1.31 1.32 1.32 1.32 1.33 90 1.09 1.20 1.23 1.24 1.25 1.25 1.26 1.26 1.27 1.27 89 1.08 1.17 1.20 1.21 1.21 1.21 1.21 1.21 1.22 1.22 88 1.07 1.14 1.16 1.17 1.17 1.17 1.17 1.17 1.17 1.17 87 1.06 1.11 1.12. 1.12 1.12 1.13 1.13 1.13 1.13 1.13 86 1.05 1.08 1.08 1.08 1.08 1.08 1.08 1.08 1.08 1.08 85 1.03 1.05 1.05 1.05 1.05 1.04 1.04 1.04 1.04 1.04 84 1.02 1.02 1.02 1.01 1.01 1.01 1.00 1.00 1.00 1.00 83 1.00 0.99 0.98 0.97 0.97 0.96 0.96 0.96 0.96 0.96 82 0.98 0.96 0.95 0.94 0.94 0.93 0.93 0.92 0.92 0.92 81 0.96 0.93 0.92 0.91 0.90 0.90 0.89 0.89 0.89 0.88 80 0.94 0.90 0.88 0.87 0.86 0.86 0.85 0.85 0.85 0.85 79 0.92 0.87 0.85 0.84 0.83 0.83 0.82 0.82 0.82 0.81 78 0.89 0.84 0.82 0.81 0.80 0.79 0.79 0.78 0.78 0.78 77 0.87 0.81 0.79 .0.78 0.77 0.76 0.76 0.75 0.75 0.75 76 0.84 0.78 0.76 0.75 0.74 0.73 0.72 0.72 0.72 0.72 75 0.82 0.75 0.73 0.72 0.71 0.70 0.69 0.69 0.69 0.68 74 0.79 0.72 0.70 0.68 0.67 0.67 0.66 0.66 0.66 0.65 73 0.77 0.69 0.67 0.65 0.64 0.64 0.62 0.62 0.62 0.62 72 0.74 0.66 0.64 0.62 0.61 0.61 0.60 0.59 0.59 0.59 71 0.71 0.63 0.60 0.59 0.58 0.58 0.57 0.56 0.56 0.56 70 0.68 0.60 0.58 0.56 0.55 0.55 0.54 0.54 0.54 0.53 69 0.65 0.57 0.55 0.54 0.53 0.52 0.51 0.51 0.51 0.50 68 0.62 0.54 0.52 0.51 0.50 0.50 0.48 0.48 0.48 0.48 67 0.59 0.51 0.49 0.48 0.47 0.47 0.46 0.45 0.45 0.45 66 0.56 0.48 0.46 0.45 0.44 0.44 0.43 0.42 0.42 0.42 65 0.53 0.45 0.43 0.42 0.41 0.41 0.40 0.40 0.40 0.39 64 0.49 0.42 0.40 0.39 0.38 0.38 0.37 0.37 0.37 0.37 63 0.46 0.39 0.37 0.36 0.35 0.35 0.35 0.34 0.34 0.34 62 0.43 0.36 0.34 0.33 0.33 0.33 0.32 0.31 0.31 0.31 61 0.39 0.33 0.31 0.30 0.30 0.30 0.29 0.29 0.29 0.28 60 0.36 0.30 0.28 0.27 0.26 0.26 0.25 0.25 0.25 0.25 <60 ≤ 0.35 ≤ 0.29 ≤ 0.27 ≤ 0.26 ≤ 0.25 ≤ 0.25 ≤ 0.24 ≤ 0.24 ≤ 0.24 ≤ 0.24 Enter table in the appropriate “number of tests” column and round down to the nearest value. Open-Graded Surface Course (OGSC)

Table 4 Definitions, Abbreviations, and Formulas for Acceptance Term Explanation Target Value (TV) The target values for gradation and asphalt binder content. Average (AVE) The sum of the lot’s test results for a measured characteristic divided by the number of test results, the arithmetic mean. Sample Standard The square root of the value formed by summing the squared Deviations difference between the individual test results of a measured characteristic and AVE divided by the number of test results minus one. Upper Limit (UL) The value above the TV of each measured characteristic that defines the upper limit of acceptable production. (Table 2) Lower Limit (LL) The value below the TV of each measured characteristic that defines the lower limit of acceptable production. (Table 2) Upper Quality Index (QU) QU = (UL - AVE)/s Lower Quality Index (QL) QL = (AVE - LL)/s Percentage of Lot Within Determined by entering Table 4 with QU. UL (PU) Percentage of Lot Within Determined by entering Table 4 with QL. LL (PL) Total Percentage of Lot PT = (PU + PL) – 100

Incentive/Disincentive Determined by entering Table 3 with PT or PL. All values for AVE, s, QU, and QL will be calculated to at least a two decimal places and will be carried through all further calculations. Rounding to lower accuracy is not allowed.

1.7DISPUTE RESOLUTION

acceptance tests.

PART 2 PRODUCTS

2.1ASPHALT BINDER

2.2HYDRATED LIME

Open-Graded Surface Course (OGSC)

2.3AGGREGATE MATERIALS

gravel, or slag.

Table 5 Aggregate Properties Properties Test Method Test Requirement One Fractured Face AASHTO T 335 95 percent min. Two Fractured Face AASHTO T 335 90 percent min. Fine Aggregate Angularity AASHTO T 304 45 min. L.A. Wear AASHTO T 96 30% max. Sand Equivalent AASHTO T 176 60 min. Plasticity Index AASHTO T 89 and T 90 0 Polish Test AASHTO T 278 & T 279 31 min. Soundness (sodium sulfate) AASHTO T 104 12% max. loss with five cycles Clay Lumps and Friable AASHTO T 112 2% max. Particles Natural Fines None None

2.4JOB MIX

passing each sieve based on the dry weight of aggregate.

mixtures. Refer to Section 02746.

Open-Graded Surface Course (OGSC)

Table 6 Aggregate Gradation Percent Passing by Dry Weight of Aggregate Sieve Size Percent ½ inch 100 ⅜ inch 90 - 100 #4 35 - 45 #8 14 - 20 # 200 2-4

2.5TACK COAT

PART 3 EXECUTION

3.1MIXING

3.2SURFACE PLACEMENT

Open-Graded Surface Course (OGSC)

3.3LIMITATIONS

September 15.

temperature are above 60 degrees F.

END OF SECTION

Open-Graded Surface Course (OGSC)