APP REVIEWER 2 Flashcards
An embankment having a PI of 30%, LL of 40%, and GI of 0. What is the degree of compaction for this kind of soil?
95% Degree of Compaction
The minimum cement factor for concrete Class A is 9 bags / cu.m. How about for concrete Class B?
8 bags per cubic meter
Quality control testing in a DPWH project is the responsibility of the ____
Constractor
When is the right time to start sampling and testing aggregates?
Once the source is identified
The minimum compressive strength for concrete Class P is 5,000 psi. What is the minimum compressive strength of concrete Class C?
3,000 psi
Where do we take additional cores when the measurement of any core taken from pavement is deficient in thickness by more than 25 mm?
At no less than 5 meter intervals parallel to the centerline in each direction from the affected location
Under what climate condition do we use lower penetration grade or hard asphalt?
Hot climate (Cold climate is for higher penetration grade or soft asphalt)
What is the basis for the acceptance or rejection of any construction material?
Materials test results / reports
Penetration test is for asphalt as cement is to ____
Consistency
Slump test is a very important test in fresh concrete to determine ____
Consistency of concrete
How many samples should be taken for an asphalt mix for each full days operation?
1 - 3 samples
The thickness of asphalt core using a caliper is based on how many measurements?
Four
The thickness of concrete core using a caliper is based on how many measurements?
Nine
Failed samples do not necessarily mean that the structure it represents is defective. Why?
Maybe the sampling is incorrect
The specification calles for a 1:2:4 concrete mic. In a one bagger mixer, which of the following amount of water is most likely required for the mix?
20 Liters
How many samples shall be submitted for testing if 315 pails of flat wall enamel paint are to be used in the project?
4 pails
The spot test on asphalt is used to determine ____
Overheating during the process of manufacture
Aggregate sub base course has a volume of 5,000 cu.m and to be laid in a 15 cm compacted depth. How many samples shall be submitted for CBR test and for sieve analysis?
2 samples for CBR
17 samples for sieve analysis
How many samples shall be submitted for quality test if 60 tons of Bituminous Prime Coat is to be used in the project?
2 samples
How many compaction tests shall be conducted for Item 201 having a volume of 8,250 cu.m?
6 compaction tests
What composed of Materials Quality Control Monthly Reports?
Summary of field tests and status of tests
What is the required mixing of mortar for Item 505 (Stone Masonry)
1 part cement and 2 parts sand by volume with sufficient water
What is the required mixing of mortar for Item 500 (Pipe Culverts and Storm Drains)?
1 part cement and 2 parts sand by volume with sufficient water
Before the project starts, the Materials Engineer or the technician must have a program on how many samples for each item of work should be tested based on the minimum testing requirements. What program or report is this?
Quality Control Program
If sample splitter is not available for use in reducing samples for test, what is the alternative way of reducing sample for testing size?
Apply quartering method and get two opposite sides as sample
Minimum moisture content at which the soil can be molded without breaking or crumbling up to 1/8 (3.2 mm)
Plastic Limit
Moisture content corresponding to 25 blows
Liquid Limit
The concrete has been tested for consistency by the use of a slump cone with base and tamping rod. After the test, the height of concrete measured is 178 mm. What is the slump of the concrete
127 mm
What is the rate of revolution of an abrasion machine used for testing the mass percent of water?
30 - 33 rpm
After the soil has been tested in an Abrasion Machine, the mass % of water computed is 21%. If this material is for Item 201, does it pass the DPWH specs?
Yes, because the specs is 50% maximum
Quality Control Assurance Report should be submitted every ____
Week
One of the duties of Materials Engineer is to see to it that all the onstruction materials are tested ____
Before it is incorporated into work
What is the maximum depth of roadway embankment per horizontal layer in loose measurement?
200 mm loose measurement
Why is it that 6 samples are needed for quality test of concrete masonry?
3 samples for compressive strength and 3 samples for absorption
Along the slope of high embankment, ____ is provided as an erosion control measures and also to improve the stability of the slope
Berm
If course aggregate like embankment is to be placed in layers, how many layers should a 40 cm thick aggregate base course is placed?
3
How long deep does a vibrator have to be inserted in a concrete mix?
Not to exceed 15 seconds at 50-60 cm interval
CBR Sample for test has been compacted but it should be soaked for how many days before testing?
Four
CBR Sample for test has been compacted but it should be soaked for how many days before testing?
Four
If sieve analysis and plasticity tests are used for soil classification, what test its result be used in field density test?
Compaction Test or Moisutre Density Relation Test
Heavy rain occurs the night before the scheduled field density test. Are you going to pursue the schedule? Why?
No, because the moisture content is high and can affect the result
Checking the gradation of composite aggregates and asphalt content of asphalt mix can be done by what test?
Extraction Test
In soil and sub surface explorations for flood control design of foundation condition, a soil sample was taken for field and laboratory tests. The test required for soil was taken, except
Specific gravity, abrasion, water content
Structure crossing above such covered underground drainage conduit shall be laid at least ___ above the top of the conduit
0.5m, 1.0m, 1.5m, 2.0m
Class of stones for riprap ranging from 30kg to a maximum of 70kg with at least 50% of the stones weighing more than 50kg
Class B
