問題一覧
1
In placing concrete for slab using buggies, the correct method will be.
Dump concrete away from previously placed concrete.
2
The strength of #5 steel bar that was tested for;
Yield Load = 13,000 lbs.
Ultimate Load = 30,000 lbs.
Determine the grade of steel?
Grade 40
3
Scales for weighing aggregates and cement shall be accurate within ______% throughout the range of use. Scales shall be inspected and sealed as often ss the Engineer may deem necessary to assure their continued accuracy.
0.5%
4
Concrete admixtures used when the normal setting time is shortened by higher temperature, preventing the formation of cold joint, reduce the incidence of thermal cracking and to maintain concrete workability during large pours or long ready-mix hauls;
Retarders
5
An angular coarse aggregate use for concrete mix will provide more;
Water content
6
Thickness determination of concrete cores shall be done at;
9 measurements
7
No.of sets of concrete cylinder sample taken for every 75 cu.m. of concrete;
1 set (3 cylinder)
8
There is a failure of flexural strength in the pavement, if you are the ME of your firm, what will you recommend?
Recording
9
Most effective factor for strength of concrete;
Water-cement ratio
10
There is a failure of flexural strength in the pavement, if you are the ME of your firm, what will you recommend?
Recoring
11
Most effective factor for strength of concrete;
Water-cement ratio
12
Number of hours that concrete cylinder sample to be submitted to the laboratory before testing;
24 hours
13
Required weight of sample for testing for coarse aggregates use for concreting;
70 kgs
14
Required weight of sample for testing for fine aggregates used for concreting;
50 kgs
15
Most specifications for concrete exposed to weathering require that water-cement ratio;
0.53
16
What test of cement determines the amount of water required to prepare hydraulic cement testing?
Normal Consistency
17
A concrete road section was not accepted for payment because beam samples representing said section failed to meet specified strength requirements. As Materials Engineer of the project, what would you recommend?
Conduct T-core test for strength determination
18
_______ are materials added to the concrete mix immediate before or during mixing to modify one or more properties of concrete in the fresh or hardened state
Admixtures
19
________ is the heat produced by the chemical reaction of cement and water.
Heat of hydration
20
In breaking cylinder samples, the load should be applied at a uniform rate within the range of _______ per minute.
20 - 50 psi
21
Ends of cylinder samples which are not plane within ______ shall be capped.
0.050 mm
22
Concrete specimen molded in a 6" x 6" x 21" beam mold should be rodded
63 times
23
Quality determination of concrete coarse aggregate sample requires
Abrasion test and Sieve analysis
24
Concrete fine aggregate should be tested for
None of the preceding
25
Admixtures are used to
All of the preceding
26
improved if water-cement ratio is lowered
All of the preceding
27
Angular coarse aggregate will require more ______ per unit volume of concrete
both
28
Slump test could be used to detect
increase in water
29
Greatest net water is required in a concrete mix with
very fine, fine aggregate
30
If the concrete beam specimen is raptures during test outside the middle third, but within 5% of the span length, the formula to be used in computing the stress is
R = 3Pa/bd^2
31
In molding concrete cylinder specimen, each layer should be rodded _____ times.
25
32
Concrete cylinder sample should be molded in _____ equal layers
3
33
Paving concrete will need less _____ than structural concrete
Sand and Water
34
Tests for coarse aggregate include
abrasion and absorption
35
Test for fine aggregate for concrete include
gradation and mortar strength
36
Unless otherwise specified in the special provision, the type of Portland cement used in paving concrete shall be
Type I
37
The desired property of fresh concrete is
workability
38
The sieve used in the seperation of aggregates after the abrasion test js
1.70 mm (No. 12)
39
Concrete beam specimens for paving concrete are molded in
2 equal layers
40
A minimum cement factor of _____ bags/cu.m. of concrete for paving concrete (based on 94 lbs bags of cement)
8.5
41
The volume of the _______ can be calculated by performing the unit weight test on the fresh concrete
concrete
42
The used of manufactured fine aggregates will generally require more
mixing water
43
The two (2) major components of concrete are.
paste and mineral aggregates
44
The coarser the fine aggregates, the higher the fines modulus.
yes
45
The more the concrete is exposed, the greater the range of movement is.
true
46
The samples of RSB to be submitted for test should be at least
100 cm
47
For Item 311 PCCP, coarse aggregate shall have a mass percent of wear not exceeding ______ when tested by AASHTO T-96
40%
48
At least one (1) set of 3 cylinder samples shall be taken from ______ cu.m. of each class of concrete of fraction thereof, placed each day
75
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100問 • 11ヶ月前問題一覧
1
In placing concrete for slab using buggies, the correct method will be.
Dump concrete away from previously placed concrete.
2
The strength of #5 steel bar that was tested for;
Yield Load = 13,000 lbs.
Ultimate Load = 30,000 lbs.
Determine the grade of steel?
Grade 40
3
Scales for weighing aggregates and cement shall be accurate within ______% throughout the range of use. Scales shall be inspected and sealed as often ss the Engineer may deem necessary to assure their continued accuracy.
0.5%
4
Concrete admixtures used when the normal setting time is shortened by higher temperature, preventing the formation of cold joint, reduce the incidence of thermal cracking and to maintain concrete workability during large pours or long ready-mix hauls;
Retarders
5
An angular coarse aggregate use for concrete mix will provide more;
Water content
6
Thickness determination of concrete cores shall be done at;
9 measurements
7
No.of sets of concrete cylinder sample taken for every 75 cu.m. of concrete;
1 set (3 cylinder)
8
There is a failure of flexural strength in the pavement, if you are the ME of your firm, what will you recommend?
Recording
9
Most effective factor for strength of concrete;
Water-cement ratio
10
There is a failure of flexural strength in the pavement, if you are the ME of your firm, what will you recommend?
Recoring
11
Most effective factor for strength of concrete;
Water-cement ratio
12
Number of hours that concrete cylinder sample to be submitted to the laboratory before testing;
24 hours
13
Required weight of sample for testing for coarse aggregates use for concreting;
70 kgs
14
Required weight of sample for testing for fine aggregates used for concreting;
50 kgs
15
Most specifications for concrete exposed to weathering require that water-cement ratio;
0.53
16
What test of cement determines the amount of water required to prepare hydraulic cement testing?
Normal Consistency
17
A concrete road section was not accepted for payment because beam samples representing said section failed to meet specified strength requirements. As Materials Engineer of the project, what would you recommend?
Conduct T-core test for strength determination
18
_______ are materials added to the concrete mix immediate before or during mixing to modify one or more properties of concrete in the fresh or hardened state
Admixtures
19
________ is the heat produced by the chemical reaction of cement and water.
Heat of hydration
20
In breaking cylinder samples, the load should be applied at a uniform rate within the range of _______ per minute.
20 - 50 psi
21
Ends of cylinder samples which are not plane within ______ shall be capped.
0.050 mm
22
Concrete specimen molded in a 6" x 6" x 21" beam mold should be rodded
63 times
23
Quality determination of concrete coarse aggregate sample requires
Abrasion test and Sieve analysis
24
Concrete fine aggregate should be tested for
None of the preceding
25
Admixtures are used to
All of the preceding
26
improved if water-cement ratio is lowered
All of the preceding
27
Angular coarse aggregate will require more ______ per unit volume of concrete
both
28
Slump test could be used to detect
increase in water
29
Greatest net water is required in a concrete mix with
very fine, fine aggregate
30
If the concrete beam specimen is raptures during test outside the middle third, but within 5% of the span length, the formula to be used in computing the stress is
R = 3Pa/bd^2
31
In molding concrete cylinder specimen, each layer should be rodded _____ times.
25
32
Concrete cylinder sample should be molded in _____ equal layers
3
33
Paving concrete will need less _____ than structural concrete
Sand and Water
34
Tests for coarse aggregate include
abrasion and absorption
35
Test for fine aggregate for concrete include
gradation and mortar strength
36
Unless otherwise specified in the special provision, the type of Portland cement used in paving concrete shall be
Type I
37
The desired property of fresh concrete is
workability
38
The sieve used in the seperation of aggregates after the abrasion test js
1.70 mm (No. 12)
39
Concrete beam specimens for paving concrete are molded in
2 equal layers
40
A minimum cement factor of _____ bags/cu.m. of concrete for paving concrete (based on 94 lbs bags of cement)
8.5
41
The volume of the _______ can be calculated by performing the unit weight test on the fresh concrete
concrete
42
The used of manufactured fine aggregates will generally require more
mixing water
43
The two (2) major components of concrete are.
paste and mineral aggregates
44
The coarser the fine aggregates, the higher the fines modulus.
yes
45
The more the concrete is exposed, the greater the range of movement is.
true
46
The samples of RSB to be submitted for test should be at least
100 cm
47
For Item 311 PCCP, coarse aggregate shall have a mass percent of wear not exceeding ______ when tested by AASHTO T-96
40%
48
At least one (1) set of 3 cylinder samples shall be taken from ______ cu.m. of each class of concrete of fraction thereof, placed each day
75