10-41 Tabl E 1014 -1
GRADATION FOR LIGHTWEIGHT COARSE AGGREGATE Sieve Size Passing Square Opening Sieves (Percent by Weight) 1" 100 3/4" 90 - 100 3/8" 10 - No. 4 0 -
7.Drilled Pier Concrete Use standard size No. 78M coarse aggregate in Drilled Pier concrete. 1016 -1 DESCRIPTION Select material is suitable material classified by gradation and performance characteristics as shown in this section. 1016 -2 USES Use select material called for in the contr act. With written approval and without additional compensation, a higher class of material may be substituted than stated in the contract. 1016 -3 CLASSIFICATIONS CLASS I Class I select material is silty or clayey soil material meeting AASHTO M 145 for soil classification A -4. Soil materials which meet AASHTO M 145 for soil classification s A-2, A-5, A-6 and A -7 are acceptable provided such materials do not have a LL greater th an 50, nor a PI of less than 7 or greater than 20. CLASS II Type 1 Select Material Type 1 s elect material is a fine aggregate material consisting of crushed stone screenings (washed or unwashed) meeting the gradation in Table 1016 -1. TABLE 1016 -1 GRADATION FOR CLASS II, TYPE 1 SELECT MATERIAL Sieve Percent Passing 3/8" 100 No. 4 80 - 100 No. 10 65 - No. 40 25 - No. 200 0 - LL ≤ 30 PI ≤ 6 Type 2 Select Material Type 2 s elect material is a granular soil material meeting AASHTO M 145 for soil classifications A -2-4 with a maximum PI of 6 and A -4 soil containing 45% maximum passing a No. 200 sieve and a maximum PI of 6. When a type is not specified, e ither type may be used, but no additional compensation will be made.
10-42 Class Iii
Type 1 Select Material Type 1 select material is a natural or manufactured fine aggregate material meeting the requirements of standard size 2S or 2MS as described in Sections 1005 and 1006. Type 2 Select Material Type 2 select material is a granular soil material meeting AASHTO M 145 for soil classification A-1 or A -3. Type 3 Select Material Type 3 select material is a natural or manufactured fine aggregate material meeting t he gradation in Table 1016- 2. TABLE 1016 -2 GRADATION FOR CLASS III, TYPE 3 SELECT MATERIAL Sieve Percent Passing 3/8" 100 No. 4 95 - 100 No. 8 65 - 100 No. 16 35 - No. 30 15 - No. 50 5 - No. 100 0 - No. 200 0 - Type 3 select material shall meet the requirements described in Sections 1005 and 1006. When a type is not specified, Type 1, Type 2 or Type 3 may be used, but no additional compensation will be made. CLASS IV Select material is a coarse aggregate material meeting the requirements of standard size ABC as described in Section s 1005, 1006 and 1010. When material is produced from aggregates from crushed concrete, Section 1043 requirements shall be applied. CLASS V Select material is a coarse aggregate material meeting the requirements of standard size 78M as described in Section s 1005 and 1006. CLASS VI Select material is a coarse aggregate material meeti ng the requirements of standard size 57 as described in Section s 1005 and 1006. CLASS VII Select material is clean, unweathered durable, blasted rock material . While no specific gradation is required, the below criteria will be used to evaluate the materi als for visual acceptance by the Engineer.
A.At least 50% of the rock has a diameter of from 1.5 feet to 3 f eet,
B.30% of the rock ranges in size from 2 inches to 1.5 feet in diameter , and
C.Not more than 20 % of the rock is less than 2 inches in diameter. No rippable rock will be permitted .
Source: North Carolina Standard Specifications for Roads and Structures, 2024 Edition. Pages 457–458 of 857.