Some Concrete Field Question & Answer For Practice
1- ASTM C172 Standard practice for sampling freshly mixed concrete covers procedures for
obtaining a representative sample of fresh concrete for ________________
a) Making concrete specimen for compressive strength only
b) Temperature Test only
c) Slump Test only
d) Temperature Test, Slump Test or making concrete specimens for compressive strength
2- As per ASTM C 1019 Standard test method for sampling and testing grout, begin filling the slump
cone within 15min of obtaining the final portion of the sample
a) True
b) False
3- As per ASTM C143 the mould should be _______________________
a) Non absorbent only
b) Rapid, non absorbent and free of debris, deformation and stick mortar
c) Rigid only
d) Free of dents, deformation and stick mortar only
4- As per ASTM C 138 formula to calculate density (unit weight) of fresh concrete is_________
D (KG/M3)= (Mc – Mm) / Vm
5- As per ASTM C143 a slump of fresh concrete is reported nearest to ________________
a) 10mm
b) 5mm
c) 1mm
6- In this test method the moulds are made from _____________ having the same absorption and
moisture content characteristics as those being used in the construction
a) Steel Forms
b) Wood Forms
c) Masonry Units
7- How many readings shall be taken for each testing area?
a) 12
b) 9
c) 10
d) 6
8- Mould shall be in the form of ______________
a) Cone
b) Cylinders
c) Cube
9- Vibration question 9000 vibrations/minute
10- As per ASTM C 31 before use cylinders mould should be lightly coated with___________
a) Mineral Oil
b) Heavy Grease Oil
11- As per ASTM C172 after fabricating the composite sample it should be protected from
___________
a) Source of rapid evaporation only
b) Sun only
c) Wind only
d) Sun, wind and sources of rapid evaporation
12- As per ASTM C 172 after fabricating the composite samples, moulding of specimens for strength
test shall be started within _________________
a) 10 min
b) 05 min
c) 15 min
13- While using the vibration for consolidation in C138, in how many layers will the concrete be
placed?
a) One layer
b) Three layer
c) Two layers
d) Five layers
14- As per ASTM C 138 internal vibrator frequency and outside diameter shall be at least
______________
a) 200 HZ, 19-38mm
b) 150 HZ, 15-30 mm
c) 150 HZ, 19-38mm
15- In raising the mould upward during slump test, what is the time limit to do this?
a) 5+-2 sec
b) 3+-2 sec
c) 7+-2 sec
d) 6+-2 sec
16- The nominal diameter mm of tamping rod used during grout sampling shall be __________
a) 15+-7
b) 10+-7
c) 10+-2
d) 15+-5
17- What is the acceptable temperature for fresh concrete ? less than or equal to _______ Co
depending on project specification
a) 36
b) 35
c) 32
d) 33
18- As per ASTM C 1019 standard test method for sampling and testing grout, a framing square is
not less than (100mm) long and not less than (4mm)
a) True
b) False
19- As per ASTM C 31 for 6inch cylinder number of tamping and tapping each layer are _______
a) 15,5-10
b) 50, 10-15
c) 25, 10-15
20- Transportation, curing and testing of the specimens- removal of moulds on grout sample specimen shall be taken between ___________
a) 24 and 48 hrs
b) 36 and 48 hrs
c) 16 and 24hrs
d) 12 and 24 hrs
21- ASTM C231 deals with_____________
a) Determination of unit weight of freshly proportioned concrete
b) Air content of freshly mixed concrete by the volumetric method
c) Air content of freshly mixed concrete by the pressure method
22- In how many hours does the grout specimen mold from the masonry unit remain undisturbed?
a) 36
b) 48
c) 12
d) 24
23- Each layer of concrete shall be rodded with ____________
a) 25 blows
b) 50 blows
c) 10 to 15 blows
d) 100 blows
24- What is the diameter of the tamping rod?
a) 3/5’’
b) 5/8’’
c) 4/5’’
d) ¾’’
25- Rolling of air meter shall be done at 45o for not more than _______
a) 50 minutes
b) 1 minutes
c) 2 minutes
d) 45 seconds
26- The temperature of fresh concrete is reported nearest to _________
a) 15 F
b) 0.1 Co
c) 0.5 Co
d) 0.1 Fo
27- As per ASTM C 172 sample shall be collected in at least _____________
a) 3 Portions
b) 4 Portions
c) 2 Portions
28- As per ASTM C 805, for a given concrete mixture rebound number is not affected
by____________
a) Type of form material
b) Age of concrete structure
c) Moisture content of test surface
d) Depth of carbonation
29- For each age 1,3,7 and 28 days how many cubes shall be tested?
a) 5
b) 2
c) 1
d) 3
30- As per ASTM C 172 sampling from continuous mixer after discharge of at least_________
Answer is not less than 10% and not more than 90%
31- Compressive strength test shall be determined in accordance with ___________
a) ASTM C 39
32- Weight of mallet for measuring 14 litres or less shall be
600+-200 g (0.6kg +-0.2kg)
33- The distance between impact points shall be at least
a)25mm
b) 35mm
c) 20mm
d) 30mm
ASTM C 1019
34- What is ASTM C1019?
a) Specification for grout for masonry
b) Test method for slump of hydraulic cement concrete
c) Specification for grout for masonry
d) Standard test method for sampling and testing grout
35- In this method the molds are made from-------- having the same absorption and moisture content characteristics as
those being used in the construction
a) Masonry units
b) Steel forms
c) Wood forms
36- Grout used in the masonry is a fluid mixture of cementitious materials and aggregate with low water content for
ease of placement
a) True
b) False
37- The nominal diameter (mm) of the tamping rod used during grout sampling shall be;
a) 15+-5
b) 10+-7
c) 15+-7
d) 10+-2
38- In how many hours does the grout specimen mold from the masonry unit remain undisturbed?
a) 24
b) 12
c) 36
d) 48
39- The size of grout samples to be used for slump and compressive strength tests shall be a minimum of ½ ft3 (0.014
a) True
b) False
40- As per ASTM C 1019 standard test method for sampling and testing grout specimens shall have a height before
capping between __________and_______ times the specimen width
a) 1.75 and 2.00 times
b) 1.65 and 1.90 times
c) 1.55 and 1.70 times
41- As per ASTM C 1019 standard test method for sampling and testing grout specimen shall have an average specimen
width between ___________and __________
a) 76mm and 95mm
b) 86 mm and 105 mm
c) 66mm and 85mm
42- As per ASTM C 1019 standard test method for sampling and testing grout. a framing square is not less than
(100mm) long and not less than (4mm) in thickness
a) True
b) False
43- The location of specimen construction should be protected and as free from perceptible vibration as possible. To do
so the molds shall be remained undisturbed for up to _______hours
a) 24
b) 48
c) 72
d) 96
44- Specimen molds shall have a cross section that is nominally square. Mold shall have a a width of;
a) 4.0 in. (102mm) to 4.75 in. (120mm)
b) 3.0 in. (76mm) to 3.75 in. (95mm)
c) 5.0 in. (127mm) to 5.75in.(146mm)
d) 6.0 in. (152mm) to 6.75 in. (171 mm)
45- During field sampling , the elapsed time between obtaining the first and final portions of the grout sample shall be
not more than _________-minutes
a) 20 minutes
b) 10 minutes
c) 15 minutes
46- If the grout is _____ the grout will be molded in one layer without striking off the top surface
a) Flowable
b) Workable
c) Sustainable
47- Transportation curing and testing of the specimens removal of molds on grout sample specimen shall be take
between? After making the specimens
a) 24 and 48 hours
b) 12 and 24 hours
c) 16 and 24 hours
d) 36 and 48 hours
48- As per ASTM C 1019 standard test method for sampling and testing grout begin filling the slump cone within 15 min of obtaining the final portion of the sample
a) True
b) False
ASTM C 42
49- As per ASTM C42 core strength tending to be higher if cut from;
a) Top of Structural element
b) Bottom of structural element
C) None of above
50- As per ASTM C42 cores for strength test shall not be taken until --- of concrete is
a) 14 days
b) 20 days
c) 28 days
51- As per ASTM C42 cores shall not be used for strength test if;
a) Damaged during removal
b) Containing embedded reinforcement
c) Both a & b
52- As per ASTM C42 for strength test cores, drilling angle to the ---a and minimum distance to formed joints are;
a) Horizontal, 6 inch
b) Perpendicular, 6 inch
c) Perpendicular, 8 inch
53- As per ASTM C42 The minimum dia of core to determine thickness of pavements slabs or walls as per ASTM C 174
is
a) 84mm
b) 94mm
c) 100mm
54- As per ASTM C42 The minimum dia of core to determine compressive strength shall be;
a) 94mm
b) 2 times the nominal maximum size of coarse aggregate
c) Both a & b
55- As per ASTM C42 for compressive strength test preferable strength Dia ratio of core is
a) 1 to 1.5
b) 1.4 to 1.9
c) 1.9 to 2.1
56- As per ASTM C42 correction factor is used if length to Dia ratio is
a) Less than 1.9
b) Equal or less than 1.75
c) Equal or less than 0.9
57- As per ASTM C42 after drilling maximum time for end separation of cores is;
a) 2 days
b) 3 days
c) 5 days
58- As per ASTM C42 after preparation by sawing/grinding and ----use of water, minimum time of cores storage in
plastic bags or
a) 3 days
b) 5 days
c) 7 days
59- As per ASTM C42 after coring specimens shall be tested within
a) 3 days
b) 5 days
c) 7 days
60- As per ASTM C42 to calculate length to dia ratio of core for compressive strength length of core is considered.
a) As drilled
b) Before capping
c) After capping
61- As per ASTM C42 core shall not be tested for compressive strength if difference between its largest and smallest dia exceeds
a) 3% of average
b) 5% of average
c) 7% of average
62- As per ASTM C42 for compressive strength test average diameter of core (with difference of diameters greater than
2% of average
a) 0.1 mm
b) 0.5 mm
c) 1mm
63- As per ASTM C42 the density of core is reported nearest to;
a) 10 kg/m3
b) 20 kg/m3
c) 30 kg/m3
64- As per ASTM C42 compressive strength of core (dia measured nearest to 0.2mm)
a) 1 psi
b) 10 psi
c) 50 psi
65- Specimens containing embedded reinforcement shall be used for splitting tensile strength and specimens for
determining flexural strength if reinforcement is mended in the tensile portion yes or No?
a) Yes
b) No
66- What is the minimum diameter if drilled core specimen as mention in ASTM C 42?
a) 2 meter
b) 5 cm
c) 102 cm
d) 90mm
67- If the ratio of length to the diameter of the specimen exceeds 2.10 it shall be reduced in length within the ratio
limits of 1.9 to 2.10 times
a) True
b) False
68- The correction factor for the measured compressive strength is apply when L/D ratio is equal or less than 1.75 is
this true or false?
a) True
b) False
ASTM C 173
69- ASTM C 173 deals with………..
a) Air content of freshly mixed concrete by the volumetric method
b) Air content of freshly mixed concrete by pressure method
c) Determination of unit weight of freshly prepared concrete
d) All of the above
70- Minimum capacity and diameter of measuring bowl is;
a) 2L, 1-1.25 times of height
b) 5L, 1-1.25 times of height
c) 5L, 1-2 times of height
71- As per ASTM C 173 concrete in bowl shall be filled in;
a) Four layer
b) Three layer
c) Two Layer
72- As per ASTM C 173 inversion and shaking of air meter shall be done for;
a) 1 minute
b) 45 minutes
c) 45 seconds
d) 50 seconds
73- Do not invert air meter for more than_______in one time
a) 5 seconds
b) 10 seconds
c) 15 seconds
d) 20 seconds
74- Rolling of air meter shall be done at 45o for not more than
a) 1 minute
b) 50 minute
c) 2 minute
d) 45 second
75- Liquid level in air meter is considered stable if change of level in 2 minutes is more than;
a) 0.25%
b) 0.50%
c) 1.0 %
76- ASTM C 173 is used to determine air content of freshly mixed concrete, containing aggregate type;
a) Dense
b) Cellular
c) Light weight
d) All of above
77- As per ASTM C 173 top section shall have a transparent scale, graduated in increments up to;
a) 0.1% of volume of measuring bowl
b) 0.5% of volume of measuring bowl
c) 1% of volume of measuring bowl
78- As per ASTM C 173 the calibrated cup is used when air content of concrete exceeds;
a) 9%
b) Calibrated range of meter
c) Both a & b
79- As per ASTM C 173 chemical used as dispersing agent is;
a) Isopropyl alcohol (60% by volume)
b) Isopropyl alcohol (70% by volume)
c) Isopropyl alcohol (70% by weight)
80- As per ASTM C 173 the calibration frequency for meter and cup is;
a) 3 months
b) 6 months
c) 12 months
81- As per ASTM C 173 the number of layers of concrete in measure and rodding/layer are;
a) 2, 25
b) 3, 25
c) 3, 50
82- As per ASTM C 173 the minimum quantity of water to add in top section before alcohol is;
a) 0.1 L
b) 0.25 L
c) 0.5 L
83- As per ASTM C 173 for acceptance of test result difference between two consecutive air content readings should not be more than;
a) 0.10%
b) 0.25 %
c) 0.50%
ASTM C 231
84- ASTM C 231 deals with ………..
a) Air content of freshly mixed concrete by the volumetric method
b) Air content of freshly mixed concrete by pressure method
c) Determination of unit weight of freshly prepared concrete
d) All of above
85- Diameter of tamping rod is……..
a) 16+-2mm
b) 18+-2mm
c) 10+-2mm
d) All of above
86- Length of rod shall be between…….
a) 100 to 300 mm
b) 400 to 600 mm
c) 500 to 600 mm
d) 200 to 600 mm
87- Weight of mallet for measuring bowl 14 litres or less shall be
a) 600+-200kg
b) 600+- 250 g
c) 1.0+-0.25 lb
d) 0.60 +-0.25 kg
88- Weight of mallet for measuring bowl larger than 14 litres shall be…..
a) 600 +-200 kg
b) 600 +- 200 g
c) 1.0+- 0.25 lb
d) 1.0+- 0.25 kg
89- Vibration method is applicable only when………
a) Slump is less than 25 mm
b) Slump is between 25 mm to 75 mm
c) All of the above
d) None of the above
90- Concrete in bowl shall be filled in…..
a) Four layer
b) Three layer
c) Two layer
d) Five layer
91- Each layer of concrete shall be rodded with….
a) 100 blows
b) 50 blows
c) 10 to 15 blows
d) 25 blows
92- After rodding each layer concrete shall be tapped
a) 10 to 15 times
b) 15 to 20 times
c) 5 to 10 times
93- ASTM C 231 is used to determine air content of freshly mixed concrete, containing aggregate type;
a) Dense
b) Porous
c) Light weight
94- As per ASTM C 231 the minimum diameter and capacity of measuring bowl is;
a) 0.5 – 1.0 time the height, 5.0 L
b) 0.75 -1.5 times the height, 6.0L
c) 1.0 -1.5 times the height, 6.0L
95- As per ASTM C 231 formula to calculate mass of fine aggregate in concrete sample under test is;
a) C= (S/B) X Cb
b) Fs= (S/B)-Fb
c) Fs= (S/B) X Fb
96- As per ASTM C 231, formula to calculate correction factor for type A meter is;
a) G=h1+h2
b) G=h1-h2
c) G=h1Xh2
97- As per ASTM C 231 (Meter Type B) after applying pressure gauge hand at the initial pressure line is stabilized by;
a) Pumping or bleeding off air
b) Tapping the gauge by hand
c) Both a & b
ASTM C 805
98- This test method covers the determination of a …….. of hardened concrete using a spring driven steel hammer.
a) Core number
b) Cylinder number
c) Strength number
d) Rebound number
99- To compare the rebound hammer test with core test we need number of locations taken shall be;
a) 2 locations
b) 4 locations
c) 6 locations
d) 7 locations
100- How many rebound tests shall be taken for frozen concrete;
a) 2
b) None
c) 3
d) 6
101- We can conduct tests directly over reinforcing bars with cover less than 20mm
a) Yes
b) No
102- How many readings shall be taken for each testing area
a) 12
b) 10
c) 9
d) 6
103- The distance between impact points and edges of member shall be at least;
a) 45mm
b) 40mm
c) 50mm
d) 55mm
104- If two of the points reading were more than 6 units different from the average, test is acceptable;
a) Yes
b) No
105- As per ASTM C 805 for strength estimation purpose relationship between round number and strength is established
by;
a) Provided by instrument manufacturer
b) Correlating rebound number with strength of core
c) Both a & b
106- As per ASTM C 805 verification anvil should be so constructed as to provide minimum rebound number of;
a) 30
b) 50
c) 75
107- As pe ASTM C 805 the minimum thickness of concrete member to be tested is ;
a) 2inch
b) 4 inch
c) 6 inch
108- As per ASTM C805 test is not conducted directly over reinforcing bars, if cover is less than;
a) 20 mm
b) 30 mm
c) 40 mm
109- As per ASTM C805 minimum number of reading in each test area and minimum distance between two points are;
a) 6, 10mm
b) 8, 20 mm
c) 10, 25 mm
ASTM C 1064
110- Temperature measuring device shall be capable of accurately measuring the temperature of the freshly mixed
concrete to_______the range of ______________Co
a) 0.5, 0-25
b) 0.25, 0-50
c) 0.5, 0-50
111- Container shall be large enough to provide at least ______inches of concrete cover in all the directions around the
sensor of temperature measuring device
a) 2
b) 3
c) 6
d) 8
112- As per ASTM C 1064, leave the temperature measuring device in freshly mixed concrete for at least
________minutes but not more than ________minutes
a) 2, 4
b) 2,6
c) 3,5
d) 2,5
113- What is the acceptable temperature for fresh concrete? Less than or equal to _______Co depending on project
specification.
a) 35
b) 32
c) 33
d) 36
114-……. reading of revolution counter of truck revolves 350 revolutions (wet mixing concrete), is the concrete acceptable?
a) Yes
b) No
115- Concrete samples can be stored at direct sunlight
a) True
b) False
116-----Temperature measuring device shall meet the criteria;
a) Readable to 0.1 co range 0-50 Co, sensing element at least 3’’ long
b) Readable to 0.5 Co, range 0-50 Co, sensing element at least 3’’ long
c) Readable to 1.0 Co, range 0-50 Co, Sensing element at least 5’’ long
117- Temperature measuring device shall be verified;
a) Every 03 months
b) Every 06 months
c) Every 12 months
118- Temperature measuring device should be submerged in fresh concrete at least;
a) 3 inch
b) 4 inch
c) 5 inch
119- After submerging the thermometer in fresh concrete a reading is taken after;
a) 1 min
b) 2 min
c) 3 min
120-----temperature of fresh concrete is reported , nearest to ;
a) 0.1 Co
b) 0.5 Fo
c) 0.5 Co
d) 0.1 Fo
121- The results of two properly conducted tests by same operator on the same sample of material should not differ buy more than;
a) 0.5 Co
b) 0.7 Co
c) 1 Co
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