Specification Part 3 - Road & Bridge Works - Urban Administration ...

519.2.1.3. Aggregate grading and binder content: The combined aggregate grading for the
particular mixture, when tested in accordance with IS: 2386 Part 1, (wet sieving method), shall fall
within the limits shown in Table 500-36.
519.2.2. Mixture Design
519.2.2.1. Requirements for the mixture: Apart from conformity with the grading and quality
requirements for individual ingredients, the mixture shall meet the requirements set out in Table
500-37.
519.2.2.2. Binder content:
(i)The binder content shall be optimized to achieve the requirements of the mixture set out in
Table 500-37.
(ii)The method adopted shall be that described in Appendix F and H of Asphalt Institute’s Manual,
MS-14.
519.2.2.3. Job Mix Formula: The Contractor shall inform the Engineer in charge in writing, at
least one month before the start of the work, the job mix formula proposed for us e in the works
and shall give the following details:
(i) Source and location of all materials;
(ii) Proportions of all materials expressed as follows where each is applicable:
(a) Binder, as percentage by weight of total mixture;
(b) Coarse aggregate/fine aggregate as percentage by weight of total aggregate;
(iii) A single definite percentage passing each sieve for the mixed aggregate;
(iv) The results of tests enumerated in Table 500-39 as obtained by the Contractor;
(v) Test results of the physical characteristics of the aggregates to be used;
(vi) Spraying temperature of binder if appropriate.
While working out the job mix formula, the Contractor shall ensure that it is based on a correct
and truly representative sample of the materials that will actually be used in the work and that the
mixture and its different
Nominal maximum
size (mm)
TABLE 500-36.
AGGREGATE GRADING AM) BITUMEN CONTENT1
9.5 13.2 19.0 26.5
Allowable thickness 25-35 36-50 51-75 76-100
(mm)
IS Sieve (mm)
Cumulative % by weight of total aggregate passing
37.5 - - - 100
26.5 - - 100 90-100
19.0 100 90-100 -
13.2 100 90-100 - 56-80
9.5 90-100 60-80
4.75 60-80 45-70 35-65 29-59
2.36 35-65 25-55 20-50 19-45
0.30 6-25 5-20 3-20 5-17
0.075 2-10 2-9 2-8 1-7
Guide to binder content, % by weight of total mixture
Cutback Min 4 to Max 6
Emulsion
Min7toMax 10
To be determined by the modified Marshall Test.
TABLE 500-37.
MIXTURE REQUIREMENTS FOR DESIGNED COLD MIX
Parameter Emulsion1 Cutback2