Requirements for Prequalification of RAP Stockpiles Sample Clauses

Requirements for Prequalification of RAP Stockpiles. Evaluation of the data will entail determining the average and standard deviation for the different test properties. Averages determined from testing of the ten locations should be used during the development of the job-mix-formula for the project. Target values for evaluation of uniformity are provided for three specific properties, including asphalt content, the percent passing the median sieve size, and the percent passing the No. 200 sieve. The median sieve size is the sieve with the percent passing closest to 50 percent. Table 1 provides the target standard deviations for these three properties. Test Properties from a uniform FRAP stockpile will have standard deviations at or below the target standard deviations. Table 1 also provides maximum allowable standard deviations. Table 1: Target and Maximum Allowable Standard Deviations RAP Property Target Std. Deviation (%) Max. Allowable Std. Deviation (%)2 Asphalt Content, % Less than 0.5 0.75 % Passing Median Sieve1 Less than 5.0 7.5 % Passing No. 200 Sieve Less than 1.5 2.0 1 Median Sieve is the sieve closest to having an average of 50% passing 2 Maximum allowable values. Figure 1 provides an example spreadsheet used for evaluating the data. For this example, the No. 8 sieve is the median sieve because it is the sieve with the percent passing closest to 50 percent. As shown in Figure 1, the asphalt content meets the target standard deviation as the calculated standard deviation is less than 0.5 percent (0.43 percent). The median sieve (No. 8) has a standard deviation slightly above the target of 5.0 percent. However, this standard deviation is not above the maximum allowable standard deviation of 7.5 percent. For the No. 200 sieve, the calculated standard deviation is 0.86 percent which is less than the target standard deviation. Figure 1: Example RAP Stoc kpile Evaluation RAP STOCKPILE ANALYSIS Plant: Smithville Material: Fine FRAP Source: Multiple Sources Sample Pb 3/4 " 1/2" 3/8" No. 4 No. 8 No. 16 No. 30 No. 50 No. 100 No. 200 Ignition 1 5.66 100 100 100 76 52 39 30 21 15 12.1 3 5.46 100 100 100 75 41 35 27 19 14 11.2 4 5.45 100 100 100 73 53 34 26 18 13 10.4 5 5.42 100 100 100 75 49 35 27 19 13 10.6 Extraction 6 4.63 100 100 100 74 54 35 27 18 13 10.6 7 4.60 100 100 100 72 41 30 23 16 11 9.0 8 4.99 100 100 100 78 46 39 30 20 14 10.7 9 4.75 100 100 100 74 50 36 27 19 14 11.4 10 4.47 100 100 100 72 45 32 24 19 12 10.0 Average: 100 100 100 74 49 35 26 19 13 10.6 St. Dev. 0.43 0.00 0.00 0.00 2.49 5.02 ...