Item 201 Aggregate Base Course

通報

問題一覧

Grading Test and Plasticity Test (LL, PL, PI) for every:

300cu.m

Laboratory Compaction Test and Quality Test (Grading, Plasticity, and Abrasion) for every

1500cu.m

California Bearing Ratio (CBR) Test for every:

2500cu.m

For every ____ of compacted depth at least ____ in situ density tests for every ____ or fraction thereof.

150mm, three, 500sq.m

In some areas where conventional base course materials are scarce or non-available, the use of ___ weathered limestone blended with ___ crushed stones or gravel shall be allowed, provided that the blended materials meet the requirements of this Item.

40%, 60%

The fraction passing the No. 200 sieve (0.075mm) shall not be greater than ___ of the fraction passing the No. 40 sieve (0.425mm).

2/3

According to AASHTO T89 and T90, the fraction passing the No. 40 sieve (0.425mm) shall have a LL of not greater than ___ and PI of not greater than ___.

25, 6

According to AASHTO T96, the course portion retained on a No. 10 sieve (2mm) shall have a mass percent of wear of ___ max by the Los Angeles Abrasion Test.

50%

According to AASHTO T193, the material passing 19mm sieve shall have a soaked CBR value of not less than ___.

80%

Filler shall be taken from sources approved by the engineer, free from hard slumps, and shall not contain more than ___ of material retained on the No.4 sieve (4.75mm).

15%

Aggregate base course will be measured by _________

cubic meter

Permitted variation from design thickness of layer

+/- 10mm

Permitted variation from design level of surface

+5mm/-10mm

Permitted surface irregularity measured by 3m straight edge

5mm

Permitted variation from design crossfall or camber

+/- 0.2%

Permitted variation from design longitudinal grade over 25m in length

+/- 0.1%

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