Fresh properties Workability for normal concrete Prelab quiz

1、Question 1(0 points)Q001-00How do you rate your understanding of the tests (slump, vebe time and compaction factor) of fresh properties of normal concrete before watching this video?Student response:CorrectResponseStudentResponseAnswer Choicesa.very unfamiliarb.unfamiliarc.neutrald.familiare.very fa

2、miliarQuestion 2(0 points)Q001-01Is it your first time taking the CSE 308 subject?Student response:CorrectResponseStudentResponseAnswer Choicesa.Yesb.NoQuestion 3(1 point)Q001-03Which part of the ready-mixed concrete which is being discharged from a concrete truck should be taken for the slump test?

3、Student response:CorrectResponseStudentResponseAnswer Choicesa.the very first partb.the very last partc.the middle partd.any partQuestion 4(1 point)Q001-06In a slump test, what is/are the characteristics of a true slump after the removal of the slump cone?. The concrete isStudent response:CorrectRes

4、ponseStudentResponseAnswer Cact and act and symmetricalc.symmetrical but not necessarily intactd.none of the aboveQuestion 5(1 point)Q001-07The entire operation of a slump test should be completed withinStudent response:CorrectResponseStudentResponseAnswer Choicesa.100 se

5、condsb.150 secondsc.3 minutesd.no restrictionQuestion 6(1 point)Q001-10When the slump test is not carried out immediately after the concrete is unloaded from a concrete truck, the obtained slump values would beStudent response:CorrectResponseStudentResponseAnswer Choicesa.smaller than the initial va

6、lueb.slightly greater than the initial valuec.greater than the initial valued.no change compared to the initial valueQuestion 7(1 point)Q001-19When carrying out the slump test, the technician did not dampen the apparatus . The obtained slump values would beStudent response:CorrectResponseStudentResp

7、onseAnswer Choicesa.smaller than the actual valueb.greater than the actual valuec.no change compared to the actual valued.equal to zeroQuestion 8(1 point)Q001-20If the design slump value of a concrete is 75mm, but the actual slump value is 25 mm when tested on site. Which of the following actions sh

8、ould a site engineer take?Student response:CorrectResponseStudentResponseAnswer Choicesa.Add water to the concrete and remix it.b.Reject the delivered concretec.Add superplasticizer to the concrete.d.Accept the concrete as it is.Question 9(1 point)Q001-09Which stage of concrete does the slump test a

9、ddress?Student response:CorrectResponseStudentResponseAnswer Choicesa.before mixingb.immediately after mixingc.24 hours after mixingd.10 years after mixingQuestion 10(1 point)Q001-17The slump test measuresStudent response:CorrectResponseStudentResponseAnswer Choicesa.fall of fresh concrete relative

10、to the top of slump mouldb.sideway spread of fresh concretec.time taken when the fall of fresh concrete reaches 75mmd.time taken when the sideway spread of fresh concrete reaches 600mmQuestion 11(1 point)Q001-22In a normal concrete mix and assuming all other variables are kept constant, a lower repl

11、acement ratio of cement by fly ash would make the fresh concreteStudent response:CorrectResponseStudentResponseAnswer Choicesa.more workableb.less workablec.have the same workabilityd.more cohesiveQuestion 12(1 point)Q001-38Which of the following safety measures should be carried out before carrying

12、 out a slump test?Student response:CorrectResponseStudentResponseAnswer Choicesa.wear a gloveb.wear a maskc.wear a breathing aidd.wear a pair of safety shoesHow do you rate your understanding of the tests (slump, vebe time and compaction factor) of fresh properties of normal concrete before watching

13、 this video? Student response: CorrectResponse StudentResponse Answer Choices a. very unfamiliar b. unfamiliar c. neutral d. familiar e. very familiar Question 2 (0 points) Q001-01 Is it your first time taking the CSE 308 subject? Student response: CorrectResponse StudentResponse Answer Choices a. Y

14、es b. No Question 3 (1 point) Q001-08 In a slump test, during the compaction of the concrete, the strokes of the compaction rod should be inserted toward the centre b. spirally and vertically Question 4 (1 point) Q001-04 d. all of the above Question 5 (1 point) Q001-07 The entire operation of a slum

15、p test should be completed within b. 150 seconds Question 6 (1 point) Q001-35 During a slump test, if you tamp each layer of the concrete with 100 strokes, which would be the effect when the concrete becomes hardened? Student response: CorrectResponse StudentResponse Answer Choices a. segregation Qu

16、estion 7 (1 point) Q001-09 Which stage of concrete does the slump test address? b. immediately after mixing Question 8 (1 point) Q001-26 In a normal concrete mix and assuming all other variables are kept constant, which of the following factors can lead to a high slump value? Student response: Corre

17、ctResponse StudentResponse Answer Choices a. a high water to cement ratio Question 9 (1 point) Q001-19 When carrying out the slump test, the technician did not dampen the apparatus . The obtained slump values would be Student response: CorrectResponse StudentResponse Answer Choices a. smaller than t

18、he actual value Question 10 (1 point) Q001-11 What are the common cause(s) of reduction of the slump value of a concrete mix? Student response: CorrectResponse StudentResponse Answer Choices d. all of the above Question 11 (1 point) Q001-25 When part of ordinary Portland cement is replaced by fly as

19、h (with greater particle size than cement grains) in concrete, the slump value is expected to be Student response: CorrectResponse StudentResponse Answer Choices a. larger Question 12 (1 point) Q001-37 Which of the following safety measures should be carried out before mixing fresh concrete? c. wear

20、 a pair of safety shoes Which part of the ready-mixed concrete which is being discharged from a concrete truck should be taken for the slump test? c. the middle part Question 4 (1 point) Q001-06 In a slump test, what is/are the characteristics of a true slump after the removal of the slump cone?. Th

21、e concrete is b. intact and symmetrical Question 6 (1 point) Q001-35 During a slump test, if you tamp each layer of the concrete with 100 strokes, which would be the effect when the concrete becomes hardened? a. segregation Question 7 (1 point) Q001-33 In a hot day in summer, ready-mixed concrete de

22、livery is expected to be delayed due to traffic jam, and is expected to reach the site 2 hours later than the expected time. Which of the following adverse effects on the delivered concrete would happen if no measures were taken? b. not workable Question 8 (1 point) Q001-11 What are the common cause

23、(s) of reduction of the slump value of a concrete mix? d. all of the above Question 9 (1 point) Q001-26 In a normal concrete mix and assuming all other variables are kept constant, which of the following factors can lead to a high slump value? a. a high water to cement ratio Question 10 (1 point) Q0

24、01-14 As an engineer, you are required to design a high performance concrete with 15% pulverized fly ash (PFA) as partial replacement of cement with a water to cement ratio of 0.3. However, the trial mix shows that the concrete slump value is only 10 mm. Which of the following changes can be adopted

25、 to enhance the workability, without reducing the early-aged strength? c. Add appropriate dosage of superplasticizer Question 11 (1 point) Q001-27 What is the normal range of slump values? b. 50-150mm Question 12 (1 point) Q001-38 Which of the following safety measures should be carried out before c

26、arrying out a slump test? d. wear a pair of safety shoes Question 3(1 point)Q001-08 In a slump test, during the compaction of the concrete, the strokes of the compaction rod should be inserted toward the centre Student response:CorrectResponseStudentResponseAnswer Choicesa.spirally and with a slight

27、 inclination b.spirally and vertically c.spirally and horizontally d.none of the above Question 4(1 point)Q001-05 Which of the following equipment is required to perform a slump test? Student response:CorrectResponseStudentResponseAnswer Choicesa.a slump coneb.a compacting rodc.a rulerd.all of the a

28、bove Question 5(1 point)Q001-04 Before carrying out the slump test, the slump cone and base plate should be Student response:CorrectResponseStudentResponseAnswer Choicesa.dampenedb.levelledc.closely attach to each otherd.all of the above Question 6(1 point)Q001-29 If slump test is not immediately ca

29、rried out after fresh concrete mixing, what would be the cause(s) of reduction of slump value? Student response:CorrectResponseStudentResponseAnswer Choicesa.water absorbed by aggregates, or bleedingb.evaporation c.hydration of cementd.all of the above Question 7(1 point)Q001-23 When a trial mix was

30、 prepared with a water to cement ratio of 0.3, the technician found that the workability is too low, he added an excessive amount of superplasticizer to enhance the workability. Which of the following adverse effects do you expect? Student response:CorrectResponseStudentResponseAnswer Choicesa.segre

31、gationb.bleedingc.reduced strengthd.all of the above Question 8(1 point)Q001-10 When the slump test is not carried out immediately after the concrete is unloaded from a concrete truck, the obtained slump values would be Student response:CorrectResponseStudentResponseAnswer Choicesa.smaller than the

32、initial valueb.slightly greater than the initial valuec.greater than the initial valued.no change compared to the initial value Question 9(1 point)Q001-36 In a concrete mix design with DOE method, the water to cement ratio was initially decided to be 0.5. After the trial mix, it was found that the t

33、ested result did not meet the target strength. When the w/c ratio is lowered to 0.45 to achieve higher strength and other contents remain unchanged, the obtained slump values would be Student response:CorrectResponseStudentResponseAnswer Choicesa.greater than beforeb.no change c.smaller than befored

34、.drops to an unworkable value Question 10(1 point)Q001-35 During a slump test, if you tamp each layer of the concrete with 100 strokes, which would be the effect when the concrete becomes hardened? Student response:CorrectResponseStudentResponseAnswer Choicesa.segregationb.void c.honeycombd.slump lo

35、ss Question 11(1 point)Q001-33 In a hot day in summer, ready-mixed concrete delivery is expected to be delayed due to traffic jam, and is expected to reach the site 2 hours later than the expected time. Which of the following adverse effects on the delivered concrete would happen if no measures were

36、 taken? Student response:CorrectResponseStudentResponseAnswer Choicesa.mesh-like cracks after hardeningb.not workablec.segregationd.bleeding Question 12(1 point)Q001-37 Which of the following safety measures should be carried out before mixing fresh concrete? Student response:CorrectResponseStudentR

37、esponseAnswer Choicesa.wear an ear muff b.wear a safety beltc.wear a pair of safety shoesd.none of the above Total score:9 / 10=90.0%Question 3(1 point)Q001-07 The entire operation of a slump test should be completed within Student response:CorrectResponseStudentResponseAnswer Choicesa.100 secondsb.

38、150 secondsc.3 minutesd.no restriction Question 4(1 point)Q001-03 Which part of the ready-mixed concrete which is being discharged from a concrete truck should be taken for the slump test? Student response:CorrectResponseStudentResponseAnswer Choicesa.the very first partb.the very last partc.the mid

39、dle partd.any partQuestion 5(1 point)Q001-06 In a slump test, what is/are the characteristics of a true slump after the removal of the slump cone?. The concrete is Student response:CorrectResponseStudentResponseAnswer Cact and asymmetrical act and symmetrical c.symmetrical but not ne

40、cessarily intactd.none of the above Question 6(1 point)Q001-27 What is the normal range of slump values? Student response:CorrectResponseStudentResponseAnswer Choicesa.0-100mmb.50-150mmc.150-300mmd.none of the above Question 7(1 point)Q001-20 If the design slump value of a concrete is 75mm, but the

41、actual slump value is 25 mm when tested on site. Which of the following actions should a site engineer take? Student response:CorrectResponseStudentResponseAnswer Choicesa.Add water to the concrete and remix it.b.Reject the delivered concrete c.Add superplasticizer to the concrete.d.Accept the concr

42、ete as it is. Question 8(1 point)Q001-32 In a normal concrete and assuming all other variables are kept constant , increasing the fineness of the fine aggregates would make the fresh concrete Student response:CorrectResponseStudentResponseAnswer Choicesa.more workable b.less workable c.more consiste

43、nt d.less consistent Question 9(1 point)Q001-26 In a normal concrete mix and assuming all other variables are kept constant, which of the following factors can lead to a high slump value? Student response:CorrectResponseStudentResponseAnswer Choicesa.a high water to cement ratiob.a low water to ceme

44、nt ratioc.late-coming concrete truckd.none of the above Question 10(1 point)Q001-17 The slump test measures Student response:CorrectResponseStudentResponseAnswer Choicesa.fall of fresh concrete relative to the top of slump mouldb.sideway spread of fresh concretec.time taken when the fall of fresh co

45、ncrete reaches 75mmd.time taken when the sideway spread of fresh concrete reaches 600mm Question 11(1 point)Q001-36 In a concrete mix design with DOE method, the water to cement ratio was initially decided to be 0.5. After the trial mix, it was found that the tested result did not meet the target st

46、rength. When the w/c ratio is lowered to 0.45 to achieve higher strength and other contents remain unchanged, the obtained slump values would be Student response:CorrectResponseStudentResponseAnswer Choicesa.greater than beforeb.no change c.smaller than befored.drops to an unworkable value Question

47、12(1 point)Q001-38 Which of the following safety measures should be carried out before carrying out a slump test? Student response:CorrectResponseStudentResponseAnswer Choicesa.wear a gloveb.wear a maskc.wear a breathing aidd.wear a pair of safety shoes Question 1(0 points)Q001-00 How do you rate yo

48、ur understanding of the tests (slump, vebe time and compaction factor) of fresh properties of normal concrete before watching this video? Student response:CorrectResponseStudentResponseAnswer Choicesa.very unfamiliarb.unfamiliarc.neutrald.familiare.very familiarQuestion 2(0 points)Q001-01 Is it your

49、 first time taking the CSE 308 subject? Student response:CorrectResponseStudentResponseAnswer Choicesa.Yesb.NoQuestion 3(1 point)Q001-04 Before carrying out the slump test, the slump cone and base plate should be Student response:CorrectResponseStudentResponseAnswer Choicesa.dampenedb.levelledc.closely attach to each otherd.all of the above Question 4(1 point)Q001-06 In a slump test, what is/are the characteristics of a true slump after the remo