Documents about Precast Concrete

  • 5 Pages

    Lecture 9-Differences in Concrete Systems

    Middle East Technical University, CE xxx

    Excerpt: ... Lecture Nine Differences in Concrete Systems On site Concrete that is cast in place, on site, is called in situ concrete. Advantages to in situ concrete: 1) Adapts to any building shape. 2) It can be assumed to be more or less monolithic, since joints only occur as a result of different pourings to the same structure. 3) It is easily used for two way structural systems. 4) It is adaptable to post tensioning. 5) No cranes are needed. Disadvantages of in situ concrete: 1) Erection of formwork is time consuming 2) Concrete must cure before it is loaded 3) Quality control of finish surfaces is not assured 4) Climate can create problems for curing, and for construction itself 5) Workmanship is variable Precast Concrete Advantages of precast concrete : 1) Rapid construction on site 2) High quality because of the controlled conditions in the factory 3) Prestressing is easily done which can reduce the size and number of the structural members. Disadvantages of precast concrete : 1) Because panel size is limi ...

  • 1 Pages

    eq2

    SUNY Farmingdale, CON 162

    Excerpt: ... Materials & Methods of Construction II Exam 2: Probable Essay Questions Question 1. Answer the following precast concrete framing questions: Prof. J. Betz A. B. C. D. E. Outline the advantages (12 min.) and disadvantages (5 min.) of precast concrete framing systems. List the four major types of precast concrete slab elements. Define the spanning capacities of each. List and draw four standard precast concrete beam and girder shapes. Describe the use of each. Outline the manufacturing process of precast concrete framing "T" slab. Draw 2 types of precast concrete framing beam to column connections. Describe the reasoning behind the intricate details. Question 2. Answer the following roofing questions: A. What are the advantages and disadvantages of sloped roofs in comparison to flat roofs? B. List three types of sloped roofing and three types of flat roofing, provide details about each. C. What are the advantages and disadvantages of using ballasting? D. Describe three possible places to locate insulation ...

  • 11 Pages

    CPCI_Introduction_Preast_n

    Concordia Canada, ENGR BCEE 345

    Excerpt: ... Parking Garages A Brief History of Precast Concrete Precast Wall Cladding Bridge Girders The History - Precast Concrete Roman Empire - 2,000 years ago Pozzolana cement Concrete technologies lost dark ages Portland cement invented in early 19th Century The History - Precast Concrete Technology and engineering improved First use of reinforced concrete for bridges. Same advances in technology and engineering brought first use of precast concrete . The History - Precast Concrete Explosion of technologies after the Second World War Further experiments with new products Quality steel allowed development of prestressing and design innovations Made precast concrete girders and factory wall panels High strength concrete was developed Admixtures increased concretes performance Specialty trucks cranes evolved Bridge Girders Many new design ideas. The History - Precast Concrete Prestressed concrete started in Canada in 1952. Research and more accurate design ...

  • 26 Pages

    CPCI_Parking_Garages_n

    Concordia Canada, ENGR BCEE 345

    Excerpt: ... PRECAST / PRESTRESSED CONCRETE PARKING STRUCTURES 1 OVERVIEW OF STRUCTURAL APPLICATIONS PARKING STRUCTURES 2 PARKING STRUCTURES Precast concrete structures are widely used in parking garages because of their long spans, fast construction and resistance to chlorides. 3 Parking structures often represent the first and last impression a visitor has when visiting a building, hospital, university, shopping or sports centre. 4 Excellent parking structures are designed specifically for the types of visitors a structure will serve, based on the facilities they support and the daily or peak flows of traffic. 5 Parkers will find other options unless a parkade is safe, secure and easy-to-use. 6 Creating the best parking structure to fit the site, users and budget requires a careful balance of all elements and a logical plan from start to finish. 7 The following slides show how precast concrete parking structure are designed and built. 8 PRECAST CONCRETE CONSTRUCTION Columns Precast columns are haunched ...

  • 36 Pages

    Concrete

    University of Florida, BCN 3611

    Excerpt: ... Division 3 - Concrete Concrete Reinforcing Accessories Concrete Finishing Curing Transporting Concrete Forms Precast Concrete BCN3611 1 Concrete Mix design: aggregate, cement, admixture, strength, color Unit: Cubic Yard (cy) Waste: 8% for slabs, 5% for other elements BCN3611 2 BCN3611 3 BCN3611 4 BCN3611 5 BCN3611 6 BCN3611 7 BCN3611 8 BCN3611 9 BCN3611 10 Reinforcing Steel Type of steel: grade, smooth/deformed, type of coating Size: #3 to #14 Unit: ton (2000 lbs) Lap Splicing Waste: 10% when the bars are cut and bent on the job Supports: chairs, spacers, bolsters, wires,. BCN3611 11 BCN3611 12 BCN3611 13 BCN3611 14 Welded Wire Mesh Designation: 6x6 10/10 long. spcg x trans. spcg. gage long. x gage trans. Available in 5' x 150' rolls Unit: 100 sf (CSF) Lap: one transverse spacing, i.e., 10% for 6x6 10/10 Waste: 5% BCN3611 15 BCN3611 16 BCN3611 17 Vapor Retarder Polyethylene (4 or 6 mil) Lap: 6" Waste: 5% ...