Question

QUESTION 4. (7 marks) (i) Describe three advantages and one disadvantage of precast concrete when compared to cast in situ concrete. (4 marks) (ii) Describe two advantages and one disadvantage of Articulated Haul Trucks when compared to rigid frame haul trucks. (3 marks)

Answer 1

Advantages of precast concrete over cast in situ concrete

1)Cost-effective: The simplified construction process reduces the time, increases the productivity, quality and safety and thus the cost is reduced.

2)Saves Construction Time: Precast Concrete construction saves time, the risk of project delay is also less. The precast concrete casting can be done simultaneously with other works on site such as earthwork, etc. and thus saves time.

3)Safe Construction Platform: No raw materials have to be stocked in site for Precast Concrete construction. It reduces the requirement of traditional formworks and props, wastage, workers, etc. and thus provides a safe working platform.

Disadvantages

1)High Initial Investment: For installing a Precast Concrete plant, heavy machines are necessary which requires a high initial investment.so as to get sufficient profit, a large scale of precast construction projects must be available

Advantages of articulated haul truck over rigid frame haul trucks

1)Articulated dump trucks have greater flexibility in terms of types and volumes of loads that can carry.

2)An articulated dump truck is an ideal choice for construction sites with uneven terrain and conditions.

Disadvantages

articulated trucks can't be able to carry as much of load as rigid frame trucks, due to their trailer size.