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Questions and Answers
What type of pile foundation is exemplified by a Steel-H pile?
What type of pile foundation is exemplified by a Steel-H pile?
What is the primary purpose of adding a superplasticizer to concrete?
What is the primary purpose of adding a superplasticizer to concrete?
Which type of joint is preferred for improving water tightness in precast concrete systems?
Which type of joint is preferred for improving water tightness in precast concrete systems?
In a continuous beam, which steel is primarily used for cantilever sections?
In a continuous beam, which steel is primarily used for cantilever sections?
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Which formwork type is suitable for speeding up slab construction in tall buildings?
Which formwork type is suitable for speeding up slab construction in tall buildings?
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Which construction equipment is particularly known for its quiet operation?
Which construction equipment is particularly known for its quiet operation?
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What type of pump is specifically mentioned for dewatering applications?
What type of pump is specifically mentioned for dewatering applications?
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At what critical temperature does a structure lose half of its strength during a fire?
At what critical temperature does a structure lose half of its strength during a fire?
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What is a key benefit of pre-tensioning in construction?
What is a key benefit of pre-tensioning in construction?
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Which of the following is crucial for planning prefabrication on a construction site?
Which of the following is crucial for planning prefabrication on a construction site?
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What internal site arrangement is important for construction speed when using prefabricated materials?
What internal site arrangement is important for construction speed when using prefabricated materials?
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How does prefabrication impact the construction process according to the provided content?
How does prefabrication impact the construction process according to the provided content?
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What is a strategic consideration for storing prefabricated materials on-site?
What is a strategic consideration for storing prefabricated materials on-site?
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Which sealing material is best suited for creating watertight joints?
Which sealing material is best suited for creating watertight joints?
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What is the most widely used type of pile in Hong Kong for displacement?
What is the most widely used type of pile in Hong Kong for displacement?
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Which of the following methods is appropriate for constructing deep basements exceeding 20 meters?
Which of the following methods is appropriate for constructing deep basements exceeding 20 meters?
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Which of these issues is NOT a potential risk when building a basement?
Which of these issues is NOT a potential risk when building a basement?
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In terms of construction time efficiency, which is a notable advantage of the top-down method?
In terms of construction time efficiency, which is a notable advantage of the top-down method?
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What is the primary advantage of using precast concrete in construction?
What is the primary advantage of using precast concrete in construction?
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Which system is recognized as the most efficient and economical in curtain wall construction?
Which system is recognized as the most efficient and economical in curtain wall construction?
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Which of the following is NOT a common type of pile test?
Which of the following is NOT a common type of pile test?
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What is a benefit of using indoor environments for precast production?
What is a benefit of using indoor environments for precast production?
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How does the use of robots and machinery contribute to the precast production process?
How does the use of robots and machinery contribute to the precast production process?
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Which factor does NOT contribute to faster construction in precast methods?
Which factor does NOT contribute to faster construction in precast methods?
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What contributes to better continuity of operation in precast construction?
What contributes to better continuity of operation in precast construction?
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Which of the following is a characteristic of the curing chamber in precast production?
Which of the following is a characteristic of the curing chamber in precast production?
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What environmental benefit is associated with precast production compared to traditional site production?
What environmental benefit is associated with precast production compared to traditional site production?
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How do hollow units in precast construction provide structural benefits?
How do hollow units in precast construction provide structural benefits?
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What is the primary advantage of using prestressed concrete in construction?
What is the primary advantage of using prestressed concrete in construction?
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Study Notes
Pile Types
- Two types of piles exist: displacement piles (Steel-H Piles) and replacement piles (Barrettes).
Tremie Pipe Advantages
- Tremie pipes prevent concrete contamination during placement.
Formwork Removal Priority
- Walls and columns can be removed first due to higher structural integrity compared to beams and slabs.
- Beams and slabs require longer removal times (around 2 weeks) compared to walls (around 24 hours).
Dewatering Pumps
- Submerged pumps and suction pumps are used in dewatering.
Self-Compacting Concrete
- Self-compacting concrete is highly workable and pumpable.
Concrete Additives
- Superplasticizers are added to concrete to improve its pumpability and flowability.
Slab Formwork for Tall Buildings
- Fly form or table form is suitable and efficient for high-rise buildings' slab construction.
Continuous Beam Steel Reinforcement
- Top steel (cantilever supports) and bottom steel (span supports) are used. Additional steel may be used across multiple spans.
Simply Supported Beam Steel
- Only bottom steel is required in a simple span, over a single span.
Precast Joint Types
- Wet joints (Monolithic Joints), using a poured-in-place topping concrete, are better for sealing. Dry joints, using gasket/sealant are not reliable.
Silent Construction Equipment
- Hydraulic vibrator machines are the quietest equipment in construction.
Structural Damage from Fire
- Structures lose half their strength at 600°C.
Tile Handling Equipment
- Material hoists are used to move tiles between floor levels in a construction site.
Epoxy and Silicone Sealants
- Silicone is best for water tightness; epoxy can be used for concrete restoration/repair.
Slab Cover Material
- Plastic is typically used between the slab and supporting steel bars.
Curtain Wall System
- Unitised systems are the most effective and economical curtain wall systems in construction.
Popular Displacement Pile
- Steel H Piles are among the most common displacement piles used in HK.
Bored Pile Installation
- The installation process of bored piles involves temporary steel casing, hydraulic oscillators, chisels, RCD with roller bits, underway marks, steel reinforcement cage installation, trempe pipe and hopper.
Common Pile Tests
- Pile tests include dynamic load tests, static load tests, sonic load tests, sonic logging tests, standard penetration tests, core drilling, vibration tests, lateral load tests, and tension tests.
Top-Down Construction Advantages
- Top-down construction reduces project completion time, permits simultaneous construction of basement and superstructure, and provides better weather-related protection.
Deep Basement Construction Methods
- For very deep basements (>20 meters), a diaphragm wall plus a top-down method is preferred.
- For basements between 10-20 meters, steel sheet piling and cofferdams (a bottom-up method) is more appropriate.
Basement Construction Risks
- Basement construction can lead to soil collapse, worker safety issues, disruption of underground utilities, settlement of nearby buildings/structures, or ground water/flooding.
Precast Concrete Advantages
- Precast concrete offers skilled-labor demands (with lower labor costs), quality control (in-factory QC), superior quality consistency, and a consistent, indoor workplace environment.
Precast Concrete Specifics
- Precast elements are often pre-cast for water tightness, including window frames, waterproofing, and toilets for water leak prevention efforts.
Precast Concrete Benefits on Site
- Precast concrete construction is faster than site construction, with no need for erecting or striking formwork and weather-independent, faster progress without significant labour disruptions.
Environmental Impact of Precast Concrete
- Precast construction has lower production wastage and offers better noise and air pollution control away from residential areas.
Prefabrication Site Planning Considerations
- Site planning should ensure tower crane capacity for material retrieval, adequate prefabricated material storage space considering the daily construction rate, and internal access for materials and equipment, with roadways suitable for vehicles turning around.
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Description
Explore essential concepts in construction engineering, including different types of piles, advantages of tremie pipes, formwork removal priorities, and dewatering methods. Understand the characteristics of advanced concrete, such as self-compacting concrete and the role of additives. This quiz is a great way to test your knowledge of these critical topics.
