Presentation of precast concrete
- 1. Properties of precast concrete GROUPMEMBER H.T NO ASHIKHASSAN 15D05A0108 HABIBKOUSHWAR 15D05A0109 MDFAIZAN ALAM 14D01A0128 MOJ
- 2. INTRODUCTION: • The concept of precast (also known as “prefabricated”) construction includes those buildings, where the majority of structural components are standardized and produced in plants in a location away from the building, and then transported to the site for assembly. These components are manufactured by industrial methods based on mass production in order to build a large number of buildings in a short time at low cost. • Precast concrete is a construction product produced by casting concrete in a reusable mold or "form" which is then cured in a controlled environment, transported to the construction site and lifted into place
- 3. Precast concrete • Enables faster programme times - not affected by weather or labour shortages. • Improves buildability - early enclosure of dry envelope enables follow-on trades to start sooner. • Produces a high standard of workmanship in factory conditions - reduces potential for accidents, addresses on-site skill shortage. • Has a high quality finish that can be left exposed - concrete's thermal properties can be exploited in low-energy buildings.
- 4. PRIMARY FUNCTIONS • KEEP WATER OUT • PREVENT AIR LEAKAGE • CONTROL LIGHT • CONTROL RADIATION OF HEAT • CONTROL CONDUCTION OF HEAT • CONTROL SOUND SECONDARY FUNCTIONS • RESIST WIND FORCES • CONTROL WATER VAPOR • ADJUST TO MOVEMENT • THERMAL & MOISTURE EXPANSION/CONTRACT ION • STRUCTURAL MOVEMENTS • RESIST FIRE • WEATHER GRACEFULLY • EASY TO INSTALL
- 5. Architectural precast concrete provides architects with an exciting medium when designing facades for a wide range of buildings, from healthcare facilities to shopping malls, commercial office buildings to sports stadiums. Precast concrete provides: • Complete thermal protection • Continuous air/vapour barrier • Effective rain screens • Superior lifespan • Reduced construction schedule and on-site labour • High quality control standards
- 6. Why? Why precast concrete structure is getting more success day by day? The truth is here- •Economical and best •Structural efficiency •Flexibility in use •Optimum use of materials •Speed of construction •Quality consciousness •Adaptability •Protection of the environment •Less labor requirement •Smooth surface finishing
- 7. Properties of precast • Flexibility of shape and form • Quality control • Strength • Durability • Fire resistance
- 8. Flexibility of shape and form • Concrete can be molded into any shape .This capability can be used to provide custom made design solutions to specific problems.
- 9. Quality Control Because precast concrete products typically are produced in a controlled environment, they exhibit high quality and uniformity.
- 10. StrEnGtH Precast exterior cladding can easily be designed to handle structural building loads, thereby reducing the need for other structural components.
- 11. DURABILI TY Precast concrete has more durability because of superior material uses and manufacturing with proper skills.
- 12. advantaGES of PrECaSt ConCrEtE • Less expensive than real brick. • Does not require an extensive footing like a real masonry wall. Can be reset should it ever shift. • More durable than real masonry - no mortar joints to let water in. • Installs quickly and easily - most can be done in one day. • Maintenance free - No need to paint or periodically replace slats as you would with wood fences.
- 13. Disadvantage of precast concrete • System building is less flexible in its design concept than purpose-mode structures • Most design briefs can be fulfilled without too much modification to the original concept • Structural connection between the precast concrete units can present both design & contractual problems
- 14. CONCLUSIO N • Pre-fabrication has a great potential to respond to new market demands. Possible solution lie not only within the classical advantages related to working conditions, technology & speed of construction, but also in new developments of materials such as high performances & self-compacting concrete, buildings system such as mixed structures, manufacturing technology, automation, service integrated products & others
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