Highway and Railroad Engineering Review Quiz 2

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The salvage or new aggregate is ______ until at least 80 mass percent of all the materials other than stone or gravel passes a 4.75mm (No. 4) sieve.

pulverized

Any material on a 50mm (2”) sieve and other ______ materials are removed.

unsuitable

Portland ______ of proper quantity is applied uniformly in a trench on top of the windrows or spreaded uniformly over the aggregates.

cement

The plant is equipped with ______ devices that will introduce the cement, aggregate and water into the mixer in quantities specified.

feeding Signup and view all the answers

Not more than 60 minutes should ______ from the start of mixing to and compaction of the laid mixture.

elapse Signup and view all the answers

The mixture is compacted and finished in accordance with the procedures as enumerated for ______ stabilized road and mix base.

lime Signup and view all the answers

Grading and traffic wear can cause __________ of materials ranging from ½ to 1 inch of the thickness per year.

losses Signup and view all the answers

Compaction is effectively done by using __________ rollers.

pneumatic tired or steel wheeled Signup and view all the answers

The DPWH classified the aggregate sub-base course as __________ which consists of furnishing, placing, and compacting aggregate sub-base course on a prepared sub-grade.

Item 200 Signup and view all the answers

The fraction passing the 0.75mm (No.200) sieve should not be greater than __________ of the fraction passing the 0.425mm No. 40 sieve.

0.666 (2/3) Signup and view all the answers

The fraction passing the 0.425mm (No. 40) sieve should have a liquid limit not greater than __________ as determined by AASHTO T-89.

35 Signup and view all the answers

The fraction passing the 0.425mm (No. 40) sieve should have a Plastic Index not more than __________ as determined by AASHTO T-90.

12 Signup and view all the answers

The coarse portion retained on a ______ sieve shall have a mass percent of wear not to exceed 50.

3.0mm (No. 10) Signup and view all the answers

The CBR value should be obtained at a maximum dry density as determined by AASHTO T-______ Method D.

180 Signup and view all the answers

The fraction passing the ______ mm (No. 200) sieve shall have a mass percent of wear not to exceed 50.

0.075 Signup and view all the answers

The materials passing the ______ sieve shall have a soaked CBR value of not less than 80%.

20mm (3/4”) Signup and view all the answers

The portion passing the ______ mm (No. 40) sieve shall have a liquid limit not more than 25 and Plastic Index not more than 6.

0.425 Signup and view all the answers

The coarse aggregate retained on ______ mm (No. 10) sieve shall have a mass percent of wear not more than 45 by L.A. abrasion tests.

2.0 Signup and view all the answers