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- What is the effect of water–cement ratio on the permeability of hardened concrete? How does permeability affect the durability of the concrete structure?Using Figure , what is the approximate percent increase in the coefficient of permeability if the water–cement ratio increases from 0.5 to 0.6? Using the same figure, what is the approximate percent increase in the coefficient of permeability if the water–cement ratio increases from 0.5 to 0.7?What is the effect of water–cement ratio on the permeability of hardened concrete? How does permeability affect the durability of the concrete structure?Using Figure 7.33, what is the approximate percent increase in the coefficientof permeability if the water–cement ratio increases from 0.5 to 0.6? Using thesame figure, what is the approximate percent increase in the coefficient ofpermeability if the water–cement ratio increases from 0.5 to 0.7?Answer carefully the following questions : 1-What is the effect on physical properties of cement, if thel- residue of cement on B.S 90 micron sieve is greater than 10% for OPC? 2-State the meaning of normal consistency of cement. 3-What is the range of values of standard consistency of cement? 4-How the consistency of cement paste is measured? 5-State the significance of initial setting time and final setting time of cement. 6-What is the range value of compressive strength for normal concrete 7 days and 28 days? 7-What is the effect of aggregate grading on the properties of concrete? 8-Describe kinds of slump of fresh concrete with sketch. 9-What is the approximate value of Flexural strength if we have 25 MPa for compressive strength? 10-What is the approximate value of split tensile strength if we have 25 MPa for compressive strength?
- 1. What is the unit weight of aggregate? 2. How do you calculate void content of aggregate? 3. What is the importance of voids in aggregate? 4. Why is it important to deterrnine the unit weight of aggregates? 5. How does unit weight affect concrete? 6. What are the differences between loose and compacted conditions of aggregates? 7. What are the factors that affect the unit weight of aggregates?Q1). Answer the followings: T-Wes major compounds GALIANA 2-The rate of hydration decreases continuously with time, why? 3 How can the progress of hydration of cement be determined? 4- List and explain factors that affecting the setting of Portland cement. 5- What is relationship between aggregate surface texture and concrete strength? 6- What are the factors governing the selection of maximum aggregate size? 7 List and explain factors that affecting the workability of fresh concrete. 8- What are the most effective means in reducing concrete bleeding? 9- What are the difficulties in hot weather concreting? 10-What is the purpose of trial mixes in a mix design of conerete?Problem 1: Answer the following question briefly: 1) Why is it important to follow standard tests exactly when testing Portland cement? 2) Is quartz rich with silica? Why it is not suitable raw material for cement production? 3) What is meant by the conversion of HAC? What are the consequences of the conversion of HAC? 4) Why the amount of gypsum added to clinker should be carefully controlled? 5) Compare the contributions of C,S and C,S to the strength of concrete? 6) What is the difference between false set and flash set? Problem 2: Assign each of the following cements to one of the ASTM Types I to V: 1) C,S = 26%, C,S = 52%, C,A = 5%, C,AF = 13%, Fineness 300 m?/Kg. 2) C,S = 56%, C,S = 22%, C,A = 9%, C,AF = 8%, Fineness 370 m²/Kg. 3) C,S = 63%, C,S = 14%, C,A = 15%, C,AF = 9%, Fineness 550 m?/Kg. 4) C,S = 49%, C,S = 28%, C,A = 7%, C,AF = 13%, Fineness 340 m?/Kg. 5) C,S = 41%, C,S = 37%, C,A = 2%, C,AF = 12%, Fineness 330 m?/Kg. Problem 3: Identify the major cement factories in…
- Q.1 Two groups of concrete produced with exactly the same mixing properties are given in the Table below. Select the group you expect to have higher compressive strength by explaining the reason in your own words and by calculating if necessary. (Similarities in your description will be checked !!!) 1st Concrete 2nd Concrete choise Explanation A Water/Cement=0.45 Water/Cement =0.60 B Dosage: 300 Dosage: 400 C Cured for 28 days in water at 20°C Cured for 28 days in air at 20°C D| 150 mm cube 100 mm cube specimen specimen E 150/300 mm cylinder specimen F Steam cured for 6 hours at 100°C 200/200 mm cube specimen Water cured for 20 hours at 40°CA sieve analysis test was performed on a sample of coarse aggregate and produced the following results:a.) Calculate the percent passing through each sieve.b.) What is the maximum size?c.) What is the nominal maximum size?Please
- 4 pts Question 23 What is the fineness modulus of this aggregate? % Cumulative Retained Retained Mass 0% Sieve Size (US) (g) Retained Passing 1" 3/4" 1/2" 3/8" # 4 650 18.3 700 19.7 632 17.8 175 4.9 # 8 200 5.6 #16 W 150 4.2 #30 125 3.5 #50 331 9.3 #100 288 8.1 #200 250 7 Pan 50 1.4 Total 3551 O 5.20 O 1.57 O 3.89 O 6.501. The strength of concrete prepared, cured & tested under specified conditions at a given age is depending on some parameters: - List these parameters 2. Discuss the main methods used for concrete curing and their effects on strength. 3. Discuss the relationship between compaction of fresh concrete and pores in hardened concrete. 4. What is the effects of pores on hardened concrete properties, especially strengths and durability? 5. Why extra water is harmful to fresh concrete and what is its effects on concrete at hardened state? 6. Discuss the different types of volume change in concrete at early and long-term ages. 7. The third-point loading flexure strength test was performed on a concrete beam having a cross section of 150 mm by 150 mm and a span of 450 mm. If the load at failure was 35.7 kN, calculate the flexural strength of this concrete. 8. A center-point loading flexural test was performed on a concrete beam having a size of 100x100x500 mm. The beam is sitting on two…A sieve analysis test was performed on a sample of coarse aggregate and produced the results in Tablea. Calculate the percent passing through each sieve.b. What is the maximum size?c. What is the nominal maximum size?d. Plot the percent passing versus sieve size on a semilog gradation chart.e. Plot the percent passing versus sieve size on a 0.45 gradation chart.f. Referring to Table (ASTM C33), what is the closest size number anddoes it meet the gradation for that standard size?