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Asked: July 27, 2020In: Construction Site Related

What Reinforcements are used in the Process of Prestressing?

DevilAVRT
DevilAVRT

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What Reinforcements are used in the Process of Prestressing?

  1. Komal Bhandakkar

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    Added an answer on October 19, 2020 at 11:49 pm
    This answer was edited.
    What Reinforcements are used in the Process of Prestressing?

    Reinforcements used in the process of prestressing: Especially in case of prestressing, we are using strands of Steel and it's called tendons. Tendons are made of high strength Steel. Three major types of reinforcements which are used in Prestressing: Spalling R/f Equilibrium R/f Bursting R/f CombinRead more

    Reinforcements used in the process of prestressing:

    Especially in case of prestressing, we are using strands of Steel and it’s called tendons.


    Tendons are made of high strength Steel.


    Three major types of reinforcements which are used in Prestressing:

    1. Spalling R/f
    2. Equilibrium R/f
    3. Bursting R/f

    Combination of reducing the structural thickness reduced conventional reinforcements quantities and fast construction often results in un prestressed structure.


    Thank You.  

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Asked: November 27, 2017In: Construction Site Related

What Concrete Grade Should be Used for Basement Waterproofing?

Gopal Mishra
Gopal Mishra

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What grade of concrete to be used for waterproofing of basement of apartment?

  1. aviratdhodare

    aviratdhodare

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    aviratdhodare
    Added an answer on October 3, 2020 at 11:26 am

    Water proofing is done using shotcrete not concrete. Basement should be built using concrete . Water proofing can also be done by polymer membrane systems called tanking ( refer to CIRIA). I used ACI 506 to design shotcrete. Its should be of 28Mpa strength using 12mm down aggregates.

    Water proofing is done using shotcrete not concrete. Basement should be built using concrete . Water proofing can also be done by polymer membrane systems called tanking ( refer to CIRIA).

    I used ACI 506 to design shotcrete. Its should be of 28Mpa strength using 12mm down aggregates.

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Asked: October 8, 2020In: Construction Site Related

What shall be the spacing for core cutter sample for dry density determination for each layer while constructing long embankment?

Muksit Pathan
Muksit Pathan

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While constructing long embankment (appx 4 km) in multiple layers of 300mm depth, what shall be spacing of core cutter samples to ensure adequate dry density measurement.

  1. AdityaBhandakkar

    AdityaBhandakkar

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    Added an answer on October 16, 2020 at 12:45 pm
    This answer was edited.

    Hi, There are not any specific criteria for the spacing of sample taken, and the decision is purely based upon site civil engineers and various criteria of soils and on observations. if you found soil which is less compacted or even is created then take samples for observation and check the bulk denRead more

    Hi, There are not any specific criteria for the spacing of sample taken, and the decision is purely based upon site civil engineers and various criteria of soils and on observations. if you found soil which is less compacted or even is created then take samples for observation and check the bulk density of soil and moisture content. Please refer to the following article for details about core cutter method and its applications: Link: https://test.theconstructor.org/geotechnical/dry-density-of-soil-by-core-cutter-method/2680/

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Asked: June 8, 2020In: Construction Site Related

What Type of Reinforcement is used in Prestressing Concrete?

Preet Chovatiya
Preet Chovatiya

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What type of reinforcement used in prestressing concrete? Is it either the standard reinforcement used in conventional RCC structure, or is there any particular type or category of reinforcement for prestressing?

  1. Neenu S K

    Neenu S K

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    Neenu S K EDITOR
    Added an answer on June 9, 2020 at 8:02 am

    Hi, The prestressing steel used for prestressed concrete can take the form of Tendons Cables Wires – (Plain wire and Indented Wire) Strands –(Two-wire, three-wire and seven-wire strand) Bars The types of prestressing steel are: Cold Worked Prestressing steel Stress-relieving prestressing steel StraiRead more

    Hi,

    The prestressing steel used for prestressed concrete can take the form of

    1. Tendons
    2. Cables
    3. Wires – (Plain wire and Indented Wire)
    4. Strands –(Two-wire, three-wire and seven-wire strand)
    5. Bars

    The types of prestressing steel are:

    1. Cold Worked Prestressing steel
    2. Stress-relieving prestressing steel
    3. Strain tempered Prestressing steel

    Read More: Specifications of Prestressing Steel in Prestressed Concrete

    Difference between Reinforcing Steel and Prestressing Steel

    Both R.C.C and Prestressed Concrete employs steel bars or wires in order to sustain tension. But both the types of concrete make use of different steel.

    The steel used by R.C.C concrete can be:

    1. Solid Bars with Ribs
    2. Wires
    3. Metal Mesh

    The steel used in Prestressed Concrete are wires, strands, solid bars as mentioned above. Prestressed concrete uses high tensile strength steel that is manufactured by increasing the carbon content in steel compared to ordinary mild steel used in R.C.C.

    In prestressed concrete, the steel used is tensioned or prestressed. This results in loss of prestress in a range of about 20%. The use of mild steel bars or HYSD bars bring a greater loss than this value. Hence, it is necessary to have high strength tensile bars for prestressed concrete.

    Also Read: What is Steel Reinforcement? Types and Properties of Steel Reinforcement?

    Regards

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Asked: July 29, 2020In: Construction Site Related

What are the type of Soil Stabilization of Highway Embankment?

civl engineer
civl engineer

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What are the type of Soil Stabilization of Highway Embankment?

  1. nikeetasharma

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    Added an answer on December 21, 2020 at 6:28 pm

    An embankment refers to a volume of earthen material that is placed and compacted for the purpose of raising the grade of a roadway (or railway) above the level of the existing surrounding ground surface. Highway embankments made of heavy materials are often built over soft ground and this can sometRead more

    An embankment refers to a volume of earthen material that is placed and compacted for the purpose of raising the grade of a roadway (or railway) above the level of the existing surrounding ground surface. Highway embankments made of heavy materials are often built over soft ground and this can sometimes leads to settlement and instability of the embankment.

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Asked: August 9, 2020In: Construction Site Related

How to Check the Strength of the Brick at Site?

aviratdhodare
aviratdhodare

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How to Check the Strength of the Brick at Site?

  1. AdityaBhandakkar

    AdityaBhandakkar

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    AdityaBhandakkar User
    Added an answer on August 10, 2020 at 8:50 pm

    This is a common building construction material. Nowadays concrete bricks are taking the place of traditional bricks. Traditional bricks are used for two types of walls. The testing of brick is the same for its uses in any type of wall. Partition wall Load-bearing wall Following are the site tests tRead more

    This is a common building construction material. Nowadays concrete bricks are taking the place of traditional bricks.

    Traditional bricks are used for two types of walls. The testing of brick is the same for its uses in any type of wall.

    1. Partition wall
    2. Load-bearing wall

    Following are the site tests to check the good quality of bricks:

    1. Edges of bricks should be sharp and the surface should be scratch resistant.
    2. All the bricks are of the same size
    3. Bricks must have a size of standard brick i.e 19 cm X 9 CM x 9 CM. To check the length breadth and height take randomly 20 bricks and observe its edges.
    4. A good brick should have a bright and uniform color.
    5. soundness test on brick: select 2 random bricks and stuck with each other so that the clear and ringing bell sound must be produced. It indicates a good and strong brick.
    6. Structure and material of bricks: select any randomly break and crack it from the middle then observe the inner portion. It must be free from any type of lumps and materials compacted homogeneously.
    7. Efflorescence test: Bricks must be free from any types of salts. Take a brick and placed it in water for 24 hours. Take the brick out and dry it in a shade. After some time of drying if any white substance produced on the brick it indicates the amount of salt present inside bricks. This type of bricks must be avoided for construction
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Asked: October 16, 2017In: Construction Site Related

How to Make Reinforcement Bars Corrosion Resistant?

Gopal Mishra
Gopal Mishra

Gopal Mishra

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How can the reinforcement bars be made corrosion resistant to be used for reinforced concrete construction?

  1. nikeetasharma

    nikeetasharma

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    Added an answer on September 8, 2020 at 11:08 pm

    CORROSION refers to an electrochemical reaction between a metal and its environment. Steel will readily rust unless it is coated. Corrosion occurs when steel reacts with chloride ions (Cl-), CO2 in the presence of a toxic environment. Thus, corrosion is uneven erosion/pitting of metal surface due toRead more

    CORROSION refers to an electrochemical reaction between a metal and its environment. Steel will readily rust unless it is coated. Corrosion occurs when steel reacts with chloride ions (Cl-), CO2 in the presence of a toxic environment. Thus, corrosion is uneven erosion/pitting of metal surface due to intense rusting and is also harmful to the service performance of rebar.

    There are many ways of reducing the risk of corrosion-related distress in concrete. The first defencing layer is concrete, which should be thick and dense. Also, the cracks should be minimized. The concrete cover should be used appropriately.

    An additional measure for corrosion-resistant is that corrosion inhibiting admixtures should be used. Epoxy coatings should be done on rebar, which acts as a physical barrier and also isolates the steel from oxygen, moisture, and chloride ions (which are the three primary elements needed for corrosion to occur).

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Asked: July 27, 2020In: Construction Site Related

Why is propping required for long structures once the formwork is removed?

DevilAVRT
DevilAVRT

DevilAVRT

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Why is propping required for long structures once the formwork is removed?

  1. nikeetasharma

    nikeetasharma

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    Added an answer on November 12, 2020 at 8:09 pm

    When the sufficient strength is attained for the long span concrete structures to support their self weight, creep deflection may occur in these structures if propping is not provided after the removal of formwork. Hence repropping is carried out after removing formwork and thus these props should nRead more

    When the sufficient strength is attained for the long span concrete structures to support their self weight, creep deflection may occur in these structures if propping is not provided after the removal of formwork. Hence repropping is carried out after removing formwork and thus these props should not be allowed to stand too long because creep loads may overstress them.

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