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Asked: In:
Gopal Mishra
Gopal Mishra

Gopal Mishra

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I want to know minimum time required for finishing activities because I want to schedule a residential project in msproject  

  1. Komal Bhandakkar

    Komal Bhandakkar

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    Komal Bhandakkar AUTHOR
    This answer was edited.

    The most average time to build a multi family house which varies the number of units in a building. In 2014 building the twenty or more units took near about 15 months to complete from the time of obtaining permits. And properties with 10 to 19 units physically finished in 13.6 months whereas 5 to 9Read more

    The most average time to build a multi family house which varies the number of units in a building.

    In 2014 building the twenty or more units took near about 15 months to complete from the time of obtaining permits. And properties with 10 to 19 units physically finished in 13.6 months whereas 5 to 9 unit building came in at  11.5 months.

    The average time from permits to start does not follow the same pattern with respect to property size. Properties with 10 to 19 units had the longest average waiting period.

     

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    • 28
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Abhishek Kirave
Abhishek Kirave

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For the reinforcement work we required the best quality of Rebar. How we can test the quality of steel reinforcement on the work site? What type of simple site test for finding steel quality?

  1. aviratdhodare

    aviratdhodare

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    aviratdhodare

    Eight major pts: Manufacturer Certificate Grade of steel Ultimate & bearing strength of steel Length of Bar Std length = 12m. Wt of bar Using formula, W = (DxD)/162 kg/m For 10mm dia, W = (10x10)/162 = 0.617 kg/m Dia of Bar Randomly check the dia of bar using "Vernier Caliper" from each lots ofRead more

    Eight major pts:

    • Manufacturer Certificate
    1. Grade of steel
    2. Ultimate & bearing strength of steel
    • Length of Bar
    1. Std length = 12m.
    • Wt of bar
    1. Using formula, W = (DxD)/162 kg/m
    2. For 10mm dia, W = (10×10)/162 = 0.617 kg/m
    • Dia of Bar
    1. Randomly check the dia of bar using “Vernier Caliper” from each lots of diff dia.
    • Tag on Bar
    1. ISI Mark
    2. Grade of Steel
    3. Company logo/Name
    • Color of Bar
    1. Should be grey & not any rusted color.
    • Bend Test
    1. Bend the bar at 180° & observe the behavior of the rebar.
    • Re-Bend Test
    1. Bend the bar at 135° & observe the behavior of the rebar.
    2. Place it in 100°C hot water for 30 mins. Then bend at 157.5° & observe the behavior of the rebar.

    Most imp’ly, the bars should have grips on it.

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    • 2
Asked: In:
Gopal Mishra
Gopal Mishra

Gopal Mishra

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Is there any procedure or method statement or guideline for inspection of painting works in buildings?

  1. AdityaBhandakkar

    AdityaBhandakkar

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    AdityaBhandakkar User
    How to Inspect Painting Works in Building?

    Hi, Inspection is mainly for maintenance and modifications in paintings. Proper steps for inspection of any painting works are not mentioned in any codes. But following are some suggestions for inspection and maintenance, please go through an article, https://test.theconstructor.org/building/methodsRead more

    Hi, Inspection is mainly for maintenance and modifications in paintings.

    Proper steps for inspection of any painting works are not mentioned in any codes. But following are some suggestions for inspection and maintenance, please go through an article,

    https://test.theconstructor.org/building/methods-process-painting-different-surfaces/17849/

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    • 48
Asked: In:
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

    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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    • 6
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Muksit Pathan
Muksit Pathan

Muksit Pathan

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I want to what is height of instrument and Rise & fall method of levelling? What is the method to calculate reduced level.

  1. nikeetasharma

    nikeetasharma

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    nikeetasharma Guru

    Height of Instrument : It is the method which deals with the obtaining of RL of the line of collimation by adding BS reading of a known RL point. Thus, RL of the line of collimation is called the Height of Instrument. It is always measured from the benchmark. Hence the benchmark is the point on theRead more

    • Height of Instrument :

    It is the method which deals with the obtaining of RL of the line of collimation by adding BS reading of a known RL point. Thus, RL of the line of collimation is called the Height of Instrument. It is always measured from the benchmark. Hence the benchmark is the point on the sea derived from mean sea level.

    – method to calculate RL;

    height of collimation (H of C) = reduced level(R.L.) + backsight (B.S.)

    reduced level (R.L.) = height of collimation (H of C) – foresight (F.S.)

    reduced level (R.L.) = height of collimation (H of C) – intermediate sight (I.S.)

     

    • Rise & fall method :

    It is the method which gives the difference of elevation between consecutive points by comparing each point after the first that immediately preceding it. Rise and fall are indicated by the difference in staff reading. After that RL is found by adding the rise to or subtracting the fall from the reduced level of the preceding point.

    – method to calculate RL;

    fall (F) = foresight (F.S.) – backsight (B.S.)

    fall (F) = intermediate sight (I.S.) – backsight (B.S.)

    rise (R) = backsight (B.S.) – foresight (F.S.)

    reduced level (R.L.) = precede reduced level  + rise (R)

    reduced level (R.L.) = precede reduce level – fall (F)

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    • 33
Asked: In:
vivek gami
vivek gami

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What is the difference between Grit and Aggregate?

  1. aviratdhodare

    aviratdhodare

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    aviratdhodare

    Aggregates less than size 6mm is called as Grit, while agg's more than 6mm in size is termed as Kapchi. Words Grit & Kapchi instead of Aggregates are normally used in Asphalt road works rather than in cement concrete works. In cement concrete mix, you can use Grit as a part of fine aggregates orRead more

    Aggregates less than size 6mm is called as Grit, while agg’s more than 6mm in size is termed as Kapchi. Words Grit & Kapchi instead of Aggregates are normally used in Asphalt road works rather than in cement concrete works. In cement concrete mix, you can use Grit as a part of fine aggregates or Coarse Sand.

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    • 0
Asked: In:
DevilAVRT
DevilAVRT

DevilAVRT

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Beginner

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

  1. nikeetasharma

    nikeetasharma

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    nikeetasharma Guru

    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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Asked: In:
Deepak Subba
Deepak Subba

Deepak Subba

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Sir, Can we place column in the clear span of a beam without mid column support as shown in the figure. I was ...

  1. aviratdhodare

    aviratdhodare

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    aviratdhodare

    Yes, you can do that. These are called hung columns. These are columns, having no foundation/ footing, rest over beams, or slabs. These are also termed as hanging columns/ floating column. They can not transfer load directly to the foundation or footing. Load from these columns is the point load onRead more

    1. Yes, you can do that. These are called hung columns. These are columns, having no foundation/ footing, rest over beams, or slabs. These are also termed as hanging columns/ floating column.
    2. They can not transfer load directly to the foundation or footing. Load from these columns is the point load on the beam over which it rests.These beams are generally deep beam need high percentage of reinforcement, also termed as transfer beam. Load is transferred through the transfer beam to the supporting columns, ultimately to the foundation.
    3. These columns are designed to take vertical load , considering it a compression member.
    4. These are abundantly provided to get more space in the ground floor to keep provisions for parking, conference hall, architectural requirement , banquet hall in hotels, commercial building etc.These are also provided in intermediate floor for the similar purpose.
    5. These columns are designed for vertical load only. In earthquake prone areas these may prove unsafe. If at all provided, they will not take lateral forces, all seismic forces shall be taken by the main columns supporting the transfer beam.
    6. Reinforcement detailing is an important issue in the design of column- beam junction.
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