1. Which of the following is responsible for the strength and durability of hydrated cement?

(a) CH(b) Ettringite(c) C-S-H (d) All  

2. Usually pozzolanic cement replacement materials react with:

1. C3S(b) C-S-H(c) CH(d) C2S

3. Compaction of concrete results in removal of:

1. Free water(b) Entrained air(c) Entrapped air(c) All  

4. Ultrasonic pulse velocity test is used for determining …….. of concrete:

1. Strength(b) Hardness(c) Durability (d) Cracks

5. Air-entraining agent is used in concrete mainly for:

1. Corrosion resistance  (b) Freeze-thaw resistance (c) Better workability (d) Less Strength

6. Which type of ASTM cement is suitable for urgent repair work?

1. Type II(b) Type III(c) Type IV(d) Type V

1. His introduction is a maximum of 500 words. The introduction is very important because it defines the context of the report. Provide a short introduction and background on the water supply system design. Presentation of water flow concepts in the piping system focusing on the energy equation (Bernoulli equation), head losses and momentum. Support all information with references. Submit goals at the end of the section. Writing 500 words

A 400 mm concrete wall supports a dead load of 280 KN/m and a live load of 230 KN. The allowable bearing pressure is 230 KN/m2 and the level of the bottom of the footing is 1.5 m below the ground surface. Assume concrete weighs 24 KN/m3, that of soil is 15.74 KN/m3, fc’ = 20.7 Mpa, fy = 248 MPa,. Use 25 mm diameter reinforcing bars. Thickness of footing = 500 mm and concrete cover is 75 mm. Calculate the (a) effective soil pressure, (b) width of wall footing, and (c) spacing of bars at critical section.

Investigate the adequacy of the square footing. The column has dimension of 500 mm x 500 mm and carries an axial load of 1210 KN dead load and 650 KN live load. Allowable soil pressure is 240 Kpa. There is 0.7 m height of soil having a unit weight of 15.74 KN/m3, fc’ = 20.7 Mpa, fy = 276.5 Mpa. The footing section is 2.8 m x 2.8 m with a 600 mm thickness. Use 25 mm diameter main bars.

• determine structural number
You should design a roadway that is to carry 100,000 people a day
(excluding truck occupants) 50,000 in design direction. The vehicles that
carry these people include; (1) personal vehicles (average occupancy of 1.5
people per car) 2 2 kip single axles, and (2) buses with 2 24 kip single axles
(assume they are filled with an average of 40 passengers). There are also
trucks on the roadway and all trucks have 1 40 kip triple axle, 1 34 kip
tandem axle, and 1 8 kip single axle. You know that the soil CBR is 8. the
initial PSI is 4.5 and the TSI is 2.5. Other values to be used:
•
All drainage coefficients = 1.0
•
Reliability = 90%
•
Overall standard deviation of traffic = 0.50

QUESTION 4 [10 MARKS] (a) The warning sign is designed to withstand a maximum wind speed of 80 km / h at sea level. Calculate the total force on a signboard 8 m by 2 m. Assuming wind is flowing perpendicular to the face of the signage.

(b) Compute the range of volume flow rate kerosene at 25°C for which the flow would be in the critical region in a DN80 (2 in) Schedule 40 Pipe and DN80 (3 in) ductile iron pipe.

Discussion topics: Why we use "Base Plate" to connect a column to foundation and what is the role of "Grout" between base plate and foundation?

Calculate the field weights of the ingredients for 0.039 m3 of concrete by using ACI Method of Mix Design. Job specifications dictate the followings:  

Cement content: 300 kg/m3

w/c: 0.57 (by weight, from the strength point of view)

w/c: 0.53 (by weight, from durability point of view)

Fine Aggregate (SSD)/Coarse Aggregate (SSD)=0.45 (by weight)

Air Content: 1,30 %  

For Fine Aggregate (Crushed): SSD Bulk Specific Gravity: 2.47, Total Moisture: 5,0 % and Absorption Aggregate: 2,7 %.  

For Coarse Aggregate (Crushed): SSD Bulk Specific Gravity: 2.60, Absorption Capacity: 2.0 %, Total Moisture: 1.9 % and Dry Rodded Unit Weight: 1470 kg/m3.

Cement: Sulphate Resisting Cement, Specific Gravity: 3.17

Types of Retaining Walls
Identify the importance and application that it represents.

1. Formulas for swelling potential involving atterberg parameters. explain the terms with an example

a. what foundation would you recommend on a soil with a high moisture content at the surface but moderate at around 3.5m for a 5-storey airport building and why that foundation

b. What can be a recommendation for the design and construction of an airport pavement? What factors are taken into consideration to achieve this

Al Amerat landfill is the first engineered sanitary landfill in Oman which began its operations in early 2011. The landfill site consists of many landfills; the first landfill is expected to complete in the end of this year. Good landfill restoration provides an opportunity for landfill operators to promote public acceptance of landfills. Restoration is a process which will return a site to a condition suitable for its proposed after use whilst incorporating measures to protect human health and the environment. Suggest Closure, Post Closure Plan and Landfill Aftercare Plan and After Use for the first landfill in Al Amerat. (Solid waste related issues)