question one: 15instructor name: dr. eng. mustafa altayeb student no.: _____ student name: _____...

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Instructor Name: Dr. Eng. Mustafa Altayeb Student No.: _________________ Student Name: _______________ College Name: _______________ Dep. / Specialist: ______________ Using Dictionary (No) University of Palestine Final Exam (AAAA) 2013/2014 Total Grade: 60 Course No: CVL 4307 Course Title: Concrete Technology Date: 27/5/4102 No. of Questions: (5) Time: 2:00 hours Using Calculator (Yes) 1/13 15 Question One: Which of these sentences are true ( ), and which are false ( )? 1. ( ) Hydration of cement is the reaction between cement particles and water, including chemical and physical processes. 2. ( ) If ettringite is formed before the concrete has hardened and free space has been occupied by other hydration products, it hence create cracks and volume instability. 3. ( ) C 3 S contributes the most to early strength and C 2 S to long-term strength of Portland cement. 4. ( ) The water bound chemically by C3S and C2S was shown to be very approximately 24 and 21 percent of the mass of the two silicates, respectively. 5. ( ) The water bound chemically by C 3 A and C 4 AF was shown to be very approximately 45 and 41 percent of the mass of the two compound, respectively. 6. ( ) CSH occupies about 75% of the structural component in a cement paste and forms directly on the surface of cement particles. 7. ( ) CSH is the major strength provider for Portland cement concrete due to its amount and small size. 8. ( ) CSH can increase the pH value to over 12 and it is good for corrosion protection of steel. 9. ( ) CH is usually called a glue gel binder. 10. ( ) C 3 S releases more hydration heat, C 2 S releases less heat. 11. ( ) Rapid-hardening Portland cement ( Type III), as its name implies, develops sitting more rapidly. 12. ( ) Special very rapid-hardening Portland cements strength developments achieved by grinding the cement to a very high fineness 700-900 m 2 /kg. 13. ( ) Sulfate attack is greatly accelerated if accompanied by alternating wetting and drying. 14. ( ) The magnesia content of sulfate-resisting cement is limited to 5 percent. 15. ( ) Segregation may happen when the concrete is mixed, transported, placed or compacted. 16. ( ) Bleeding is defined as phenomenon by virtue of which water appears on the surface after a concrete has been placed and set.

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  • Instructor Name: Dr. Eng. Mustafa

    Altayeb

    Student No.: _________________

    Student Name: _______________

    College Name: _______________

    Dep. / Specialist: ______________

    Using Dictionary (No)

    University of Palestine

    Final Exam (AAAA)

    2013/2014 Total Grade: 60

    Course No: CVL 4307

    Course Title: Concrete Technology

    Date: 27/5/4102

    No. of Questions: (5)

    Time: 2:00 hours

    Using Calculator (Yes)

    1/13

    15 Question One:

    Which of these sentences are true ( ), and which are false ( )?

    1. ( ) Hydration of cement is the reaction between cement particles and water, including chemical

    and physical processes.

    2. ( ) If ettringite is formed before the concrete has hardened and free space has been occupied by

    other hydration products, it hence create cracks and volume instability.

    3. ( ) C3S contributes the most to early strength and C2S to long-term strength of Portland cement.

    4. ( ) The water bound chemically by C3S and C2S was shown to be very approximately 24 and 21

    percent of the mass of the two silicates, respectively.

    5. ( ) The water bound chemically by C3A and C4AF was shown to be very approximately 45 and

    41 percent of the mass of the two compound, respectively.

    6. ( ) C–S–H occupies about 75% of the structural component in a cement paste and forms directly

    on the surface of cement particles.

    7. ( ) C–S–H is the major strength provider for Portland cement concrete due to its amount and

    small size.

    8. ( ) C–S–H can increase the pH value to over 12 and it is good for corrosion protection of steel.

    9. ( ) CH is usually called a glue gel binder.

    10. ( ) C3S releases more hydration heat, C2S releases less heat.

    11. ( ) Rapid-hardening Portland cement ( Type III), as its name implies, develops sitting more

    rapidly.

    12. ( ) Special very rapid-hardening Portland cements strength developments achieved by grinding

    the cement to a very high fineness 700-900 m2/kg.

    13. ( ) Sulfate attack is greatly accelerated if accompanied by alternating wetting and drying.

    14. ( ) The magnesia content of sulfate-resisting cement is limited to 5 percent.

    15. ( ) Segregation may happen when the concrete is mixed, transported, placed or compacted.

    16. ( ) Bleeding is defined as phenomenon by virtue of which water appears on the surface after a

    concrete has been placed and set.

  • Instructor Name: Dr. Eng. Mustafa

    Altayeb

    Student No.: _________________

    Student Name: _______________

    College Name: _______________

    Dep. / Specialist: ______________

    Using Dictionary (No)

    University of Palestine

    Final Exam (AAAA)

    2013/2014 Total Grade: 60

    Course No: CVL 4307

    Course Title: Concrete Technology

    Date: 27/5/4102

    No. of Questions: (5)

    Time: 2:00 hours

    Using Calculator (Yes)

    2/13

    17. ( ) It’s good to increase the workability of concrete with adding more water because this

    increases its strength and durability.

    18. ( ) Increase of aggregate/cement ratio increases workability.

    19. ( ) More cement is needed when finer aggregate grading are used.

    20. ( ) Sufficient paste is required to coat the aggregates and to provide lubrication to decrease

    interactions between aggregate particles during mixing.

    21. ( ) More rounded shapes interfere with the movement of adjacent particles.

    22. ( ) Round surface requires more lubrication for movement.

    23. ( ) Shape can influence strength by increasing surface area available for bonding with the paste.

    24. ( ) Durability of aggregate can be divided into physical and chemical causes, chemical durability

    – exposure to freezing and thawing, wetting and drying.

    25. ( ) The typical bulk density of aggregate used in making normal concrete ranges from 1200 to

    1750 kg/m3.

    26. ( ) The relative density of an aggregate is defined is the ratio of its volume to the volume of an

    equal absolute of water.

    27. ( ) The relative density of an aggregate (ASTM C 127 and C 128) is defined is the ratio of its

    mass to the mass of an equal absolute of water.

    28. ( ) Low abrasion resistance of aggregate may decrease the quantity of fines in the concrete

    during mixing; and hence increases the water requirement.

    29. ( ) HRWRs reduce the water content of a given concrete mixture between 12 and 25%.

    30. ( ) The main reason for air entrainment is to improve the durability of the concrete to freeze-

    thaw degradation.

  • Instructor Name: Dr. Eng. Mustafa

    Altayeb

    Student No.: _________________

    Student Name: _______________

    College Name: _______________

    Dep. / Specialist: ______________

    Using Dictionary (No)

    University of Palestine

    Final Exam (AAAA)

    2013/2014 Total Grade: 60

    Course No: CVL 4307

    Course Title: Concrete Technology

    Date: 27/5/4102

    No. of Questions: (5)

    Time: 2:00 hours

    Using Calculator (Yes)

    3/13

    15 Question Two: Complete the following?

    1. The limitation of Ordinary Portland (Type I) cement on the clinker composition is that not less

    than …………….. of its mass consists of ………………..……….. taken together, and that the

    ratio of CaO to SiO2, also by mass, be not less than …………..

    2. The of ordinary Portland (Type I) cement content of MgO is limited to a maximum of ………..%

    3. The increased rate of gain of strength of the rapid-hardening Portland cement is achieved by a

    higher ……………. content and by...………………. of the cement clinker.

    4. ASTM Type III cements have a specific surface, measured by the Blaine method, of …………

    m2/kg, compared with……………… m

    2/kg to Type I cement.

    5. The British Standard for sulfate-resisting cement stipulates a maximum C3A content of ………….

    %. The ……………. is limited to 2.5 percent. In the United State, this cement is known as

    ………… cement and limits the C3A content to ………%, and also restricts the sum of the

    content of ……….. plus …………… content to 25 percent.

    6. Super sulfated cement is made by grinding a mixture of ……………. percent of granulated

    ………………… with …………… percent of ………………and up to ……… percent of

    Portland cement clinker.

    7. Super sulfated cement is highly resistant to resistant to acids and to oils.

    8. From placing to final set, concrete is in a plastic, semi-fluid state. Heavier particles (aggregates)

    have tendency to move down which call ………….. Mix water has a tendency to move up which

    call…………………

    9. ………………..is a form of bleeding in which water rising in the internal channels within concrete

    10. The …………………..of the poker determines how much concrete is vibrated at one time.

    11. The area vibrated at one time is called the ……………………….. This can be seen by over what

    …………………………. to the surface.

    12. The …………………….. will be greater with a LARGER poker and ………………….

    13. FM is computed by…………………..percentages of aggregate retained on …………….. and

    dividing the sum by 100.

    14. Sufficient paste is required to coat the aggregates and to ………………. to decrease ……………..

    between aggregate particles during mixing.

  • Instructor Name: Dr. Eng. Mustafa

    Altayeb

    Student No.: _________________

    Student Name: _______________

    College Name: _______________

    Dep. / Specialist: ______________

    Using Dictionary (No)

    University of Palestine

    Final Exam (AAAA)

    2013/2014 Total Grade: 60

    Course No: CVL 4307

    Course Title: Concrete Technology

    Date: 27/5/4102

    No. of Questions: (5)

    Time: 2:00 hours

    Using Calculator (Yes)

    4/13

    12 Question Three:

    What the meaning of:

    1. Fluidity or consistency

    2. Stability or cohesiveness

    3. Workability

    4. Curing

  • Instructor Name: Dr. Eng. Mustafa

    Altayeb

    Student No.: _________________

    Student Name: _______________

    College Name: _______________

    Dep. / Specialist: ______________

    Using Dictionary (No)

    University of Palestine

    Final Exam (AAAA)

    2013/2014 Total Grade: 60

    Course No: CVL 4307

    Course Title: Concrete Technology

    Date: 27/5/4102

    No. of Questions: (5)

    Time: 2:00 hours

    Using Calculator (Yes)

    5/13

    5. Soundness

    6. Bulk Density

    6 Question Four: 1. List with short explain six factors affecting concrete workability

  • Instructor Name: Dr. Eng. Mustafa

    Altayeb

    Student No.: _________________

    Student Name: _______________

    College Name: _______________

    Dep. / Specialist: ______________

    Using Dictionary (No)

    University of Palestine

    Final Exam (AAAA)

    2013/2014 Total Grade: 60

    Course No: CVL 4307

    Course Title: Concrete Technology

    Date: 27/5/4102

    No. of Questions: (5)

    Time: 2:00 hours

    Using Calculator (Yes)

    6/13

    2. List the Curing methods

    3. List the Reasons for using Admixtures

  • Instructor Name: Dr. Eng. Mustafa

    Altayeb

    Student No.: _________________

    Student Name: _______________

    College Name: _______________

    Dep. / Specialist: ______________

    Using Dictionary (No)

    University of Palestine

    Final Exam (AAAA)

    2013/2014 Total Grade: 60

    Course No: CVL 4307

    Course Title: Concrete Technology

    Date: 27/5/4102

    No. of Questions: (5)

    Time: 2:00 hours

    Using Calculator (Yes)

    7/13

    12 Question Five: Concrete is required for a reinforcement concrete beam to be located in a solid slab, where it will

    not subject to substantial freezing and thawing. The concrete is required to have an average 28-day

    compressive strength 25Mpa for the condition of placement. The used slump should be 80mm, and

    the dimensions of this beam are as follow: (b=20cm, t=10cm, s=1.5cm as Fig. 1). The properties of

    materials are as follow:

    Concrete type I, specific gravity (SG)=3.15.

    Fine aggregates: Specific gravity (SG)SSD = 2.64, Absorption Capacity =1.5%. Surface Moisture

    (SM)=3.3%, Fineness Model (FM) = 2.9.

    Coarse Aggregates: Specific gravity (SG)SSD = 2.65, Absorption Capacity (AC)=1.8%, Surface

    Moisture (SM) SSD = 1.2%, Dry unit weight =1700kg/m3.

    Fig. 1

  • Instructor Name: Dr. Eng. Mustafa

    Altayeb

    Student No.: _________________

    Student Name: _______________

    College Name: _______________

    Dep. / Specialist: ______________

    Using Dictionary (No)

    University of Palestine

    Final Exam (AAAA)

    2013/2014 Total Grade: 60

    Course No: CVL 4307

    Course Title: Concrete Technology

    Date: 27/5/4102

    No. of Questions: (5)

    Time: 2:00 hours

    Using Calculator (Yes)

    8/13

    Calculate the proportions of concrete materials according to ACI design method?

  • Instructor Name: Dr. Eng. Mustafa

    Altayeb

    Student No.: _________________

    Student Name: _______________

    College Name: _______________

    Dep. / Specialist: ______________

    Using Dictionary (No)

    University of Palestine

    Final Exam (AAAA)

    2013/2014 Total Grade: 60

    Course No: CVL 4307

    Course Title: Concrete Technology

    Date: 27/5/4102

    No. of Questions: (5)

    Time: 2:00 hours

    Using Calculator (Yes)

    9/13

    Calculate the proportions of concrete materials according to BS design method?

    End of Questions

    Good Luck

  • Instructor Name: Dr. Eng. Mustafa

    Altayeb

    Student No.: _________________

    Student Name: _______________

    College Name: _______________

    Dep. / Specialist: ______________

    Using Dictionary (No)

    University of Palestine

    Final Exam (AAAA)

    2013/2014 Total Grade: 60

    Course No: CVL 4307

    Course Title: Concrete Technology

    Date: 27/5/4102

    No. of Questions: (5)

    Time: 2:00 hours

    Using Calculator (Yes)

    10/13

    Table 1

    Table 2

    Table 3

  • Instructor Name: Dr. Eng. Mustafa

    Altayeb

    Student No.: _________________

    Student Name: _______________

    College Name: _______________

    Dep. / Specialist: ______________

    Using Dictionary (No)

    University of Palestine

    Final Exam (AAAA)

    2013/2014 Total Grade: 60

    Course No: CVL 4307

    Course Title: Concrete Technology

    Date: 27/5/4102

    No. of Questions: (5)

    Time: 2:00 hours

    Using Calculator (Yes)

    11/13

    Fig. 2

    Fig. 3 a

  • Instructor Name: Dr. Eng. Mustafa

    Altayeb

    Student No.: _________________

    Student Name: _______________

    College Name: _______________

    Dep. / Specialist: ______________

    Using Dictionary (No)

    University of Palestine

    Final Exam (AAAA)

    2013/2014 Total Grade: 60

    Course No: CVL 4307

    Course Title: Concrete Technology

    Date: 27/5/4102

    No. of Questions: (5)

    Time: 2:00 hours

    Using Calculator (Yes)

    12/13

    Fig. 3 b

    Fig. 3c

    Table 4

  • Instructor Name: Dr. Eng. Mustafa

    Altayeb

    Student No.: _________________

    Student Name: _______________

    College Name: _______________

    Dep. / Specialist: ______________

    Using Dictionary (No)

    University of Palestine

    Final Exam (AAAA)

    2013/2014 Total Grade: 60

    Course No: CVL 4307

    Course Title: Concrete Technology

    Date: 27/5/4102

    No. of Questions: (5)

    Time: 2:00 hours

    Using Calculator (Yes)

    13/13

    Fig. 4

    Table 5