Item 200 Aggregate Subbase Course

通報

問題一覧

According to AASHTO T89, the fraction passing the No. 40 sieve (0.425mm) shall have a LL of:

not greater than 35

According to AASHTO T90, the fraction passing the No. 40 sieve (0.425mm) shall have a PI of:

not greater than 12

When the required thickness is more than ______, the aggregate subbase shall be spread and compacted into ______ or more layers of approximately equal thickness, and the minimum compacted thickness of any layer shall not exceed ______.

150mm, two, 150mm

Compaction on each layer shall continue until a the FDT result is _____.

100%

At least _____ in situ FDT should be conducted in trial section of _____ or fraction thereof per material or procedure and per layer

three, 500sq.m

Permitted variation from design thickness of layer

+/- 20mm

Permissible variation in design level of surface

+10mm/-20mm

Permitted surface irregularity measured by 3m straight edge

20mm

Permitted variation from design crossfall or camber

+/- 0.3%

Permitted variation from design longitudinal grade over 25m in length

+/- 0.1%

Basis of payment is in _____.

cubic meter

The course portion, retained on a No. 40 sieve (2mm) shall have a mass percent of wear ___ max by the Los Angeles Abrasion Test

50%

The material shall have a soaked CBR value of ___ max as determined by AASHTO T193

30%

Laboratory Compaction Test and Quality Test for every:

1500cu.m

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

300cu.m

California Bearing Ratio (CBR) Test for every:

2500cu.m

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