Instructor: Dr. Özgür EREN. TIME ALLOWED: 60 minutes (Part A) minutes (Part B)=Total 3 hours

Transcription

1 Eastern Mediterranean University Department of Civil Engineering CIVL284 Materials of Construction Fall , Final Examination, 18 th January 2010, Instructor: Dr. Özgür EREN TIME ALLOWED: 60 minutes (Part A) minutes (Part B)=Total 3 hours Student Name-Surname: Student i.d. number: Question Mark (%) TOTAL Plese read before you start: 1. Calculators can only be used for Part A. 2. Do not borrow any material from your friends. 3. Do not ask any question to the invigilator and do not look around. 4. You can take Part B if you finish Part A earlier. 5. Write your answers neatly. 6. Do not forget to fill survey form and research assistant(s) evaluation form at the end of examination. CIVL284 Materials of Construction-Final-Fall Page 1

2 PART A- (35%) DURATION: 90 MINUTES 1. Make a trial mix of 0.08 m3 for specifications given below. Use tables and figures attached (19%). Characteristic : C30 concrete (use table given below-specify size of sample as cylinder or cube) Margin : 4 MPa Cement: Class 42.5 Slump required: 110 mm Maximum aggregate size: 40 mm (use ratios of 1:1.5:3 for 10:20:40 mm sizes) Coarse aggregate: Crushed Fine aggregate: Uncrushed (70% passes 600 micron sieve) Minimum cement content: 300 kg/m 3 Maximum allowable free- w/c ratio: 0.50 Relative density of aggregates (SSD): 2.65 Concrete Class Table. Standard for Concrete/Ready Mixed Concrete according to TS Characteristic Fck 28-Days Compressive Strength (N/mm 2 ) Cylinder =15 cm h=30cm Average Min. acceptable at site Average min. at site Characteristic Fck Average Cube 15x15x15cm Min. acceptable at site Average min. C C C C C C at site 2. From the sieve analysis given below (8%); a. Calculate fineness modulus: FM=? b. Draw grading curve on attached chart. Sieve Amount size (mm) Retained (gr) % Retained Cumulative % Retained Cumulative % Passing CIVL284 Materials of Construction-Final-Fall Page 2

3 3. The following concrete samples were tested for compression and failure loads are recorded. Calculate the in MPa for each sample. (4%) Sample Size (mm) Failure load (kn) Calculation Result (MPa) x300 (dxl) The following concrete samples were tested for splitting tensile and failure loads are recorded. Calculate the splitting tensile in MPa for each sample. Related formulas are given also below (4%). Sample Size (mm) Failure load (kn) Loading direction Calculation Result (MPa) 150x300 (dxl) 300 Normal Diagonal 2P f t ld cylinder f t = P/s 2 Cube normal direction f t = P/s 2 Cube diagonal direction P: Failure load; l: length of cylinder; d: diameter of cylinder; s: one side of cube. CIVL284 Materials of Construction-Final-Fall Page 3

4 Student Name Surname: Stydent i.d. number: CIVL284 FINAL EXAMINATION, Fall , 18 th January 2010 PART B- (65%) DURATION: 90 MINUTES 5. Suppose that you have 5 different type of cements in your hand (Low Heat Portland cement- LHPC, Rapid Herdening Portland Cement-RHPC, Sulfate Resisting Portland Cement-SRPC, Ordinary Portland Cement-OPC). Which type(s) would you prefer to use for the following civil engineering works? (3%) a. Reinforced concrete bridge construction (normal wether conditions): b. Reinforced concrete dam construction: c. Reinforced concrete building close to EMU Beach Club: 6. What is the aim of calcination gypsum at 190 O C? (3%) 7. Below you can see the classification of limes according to chemical composition. Fill in blanks to specify the correct type of lime. (4%) calcium lime : (CaO 90%) rich, fat, caustic lime lime : 75 < CaO < 90% lime : MgO 20% (dolomitic) lime: MgO > 25% 8. Below you see 3 different grading conditions of aggregates. For each condition, discuss (a) friction among particles, (b) interlocking if used in concrete, (c) amount of voids among particles. (6%) Friction Interlocking Voids 1 9. During handling of fresh concrete, what are the two most important factors affecting the selection of method? (4%) CIVL284 Materials of Construction-Final-Fall Page 4

5 10. Permeability of concrete can be directly related to durability of hardened concrete. Why? (5%) 11. Give names of mortars used for clay bricks. (4%) 12. Why surface of clay brick is treated during production stage? Explain. (3%) 13. Complete the table below. Write at least one stone for each application. (4%) Appication Exterior wall cladding Interior flooring Kitchen counter top Roofing Commonly used stones 14. Draw the patterns of random rubble masonry. (2%) 15. State the use of following steels. (4%) a. Low carbon steels: b. High carbon steels: CIVL284 Materials of Construction-Final-Fall Page 5

6 16. What is the reason of using reinfrocement steel in concrete? Explain. (3%) 17. Give 2 factors affecting of timber. (4%) 18. Give two advantages of lightweight plasters on walls.(4%) 19. What is the most important criteria used for selection of type of finishing coat? (3%) 20. What could be the reason(s) of below shown cracks on the building? (5%) 21. Give 2 important resons to use plastics in constructions. (4%) 22. What are the main differences among thermoplastics, and thermosetting plastics? (4%) CIVL284 Materials of Construction-Final-Fall Page 6