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Asked: May 15, 2020In: Foundation

What is the Possibility of Footing Failure with Reduced Cement Content?

Stranger tides
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During manual concreting of a raft footing which was designed for M25 grade concrete, the estimated cement required was 240 bags, while the laborers due to sheer negligence have added only 140 bags. The Soil conditions are good. There ...

  1. KomalBhandakkar

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    Added an answer on October 19, 2020 at 10:41 pm
    This answer was edited.
    What is the Possibility of Footing Failure with Reduced Cement Content?

    Effect of cement content on strength of footing: The result reveals that the strength of concrete Foundation increases with increasing cement content in it. However, for concrete with cement content more than 150 kg per metre cube then the strength increases with the increase in the size of coarse aRead more

    Effect of cement content on strength of footing:

    The result reveals that the strength of concrete Foundation increases with increasing cement content in it.


    However, for concrete with cement content more than 150 kg per metre cube then the strength increases with the increase in the size of coarse aggregate up to 25 mm and decreases as the aggregate size increases beyond 25mm.


    Without a proper range of cement in the mixture then low strength development or excessive shrinkage may occur leading to premature deterioration.


    Thank you.  

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Asked: September 22, 2020In: Foundation

Foundation appears to move up or down

hbgtbt
hbgtbt

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Good afternoon Folks:  If my foundation appears to move up when we get heavy rains and then back down when we have no rain for months – other than this being an irritant ; does this generally mean there ...

  1. KomalBhandakkar

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    Added an answer on November 21, 2020 at 5:43 pm
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    The vertical movement in foundations is caused by : Either downwards movement of the wall or wall footing, when a wall footing sinks in soft soil. An up and down movement of the wall or wall footings such as when a wall is disturbed by frost in a freezing climate Expansive clay soils expand or shrinRead more

    The vertical movement in foundations is caused by :

    1. Either downwards movement of the wall or wall footing, when a wall footing sinks in soft soil.
    2. An up and down movement of the wall or wall footings such as when a wall is disturbed by frost in a freezing climate
    3. Expansive clay soils expand or shrink as their water content increases or decreases.

    Thank You.

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Asked: July 16, 2020In: Foundation

Which type of foundation are used for G+5 building?

Vivek Patel
Vivek Patel

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Which type of foundation are used for G+5 building?

  1. KomalBhandakkar

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    Added an answer on November 21, 2020 at 6:00 pm
    This answer was edited.

    Pile foundation and raft foundation is used for a high rise structure. Pile foundations are more capable of taking higher loads than spread footings.   When allowable bearing pressure is low, the heavy structure is present & the site is with a highly compressible layer; then raft foundationRead more

    Pile foundation and raft foundation is used for a high rise structure.

    Pile foundations are more capable of taking higher loads than spread footings.


     

    When allowable bearing pressure is low, the heavy structure is present & the site is with a highly compressible layer; then raft foundation is applicable.


    Thank You.

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Asked: July 29, 2020In: Foundation

Which type of foundation is best for black cotton soil?

Himanshu joshi
Himanshu joshi

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Which type of foundation is best for black cotton soil?

  1. nikeetasharma

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    Added an answer on December 15, 2020 at 7:24 pm

    Depending on the structural needs one can choose shallow, deep as well as mat foundation. The thing that matters is which type of structure is going to be built. Thank you!

    Depending on the structural needs one can choose shallow, deep as well as mat foundation. The thing that matters is which type of structure is going to be built.

    Thank you!

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Asked: July 22, 2020In: Foundation

What is Pedestal in Column?

vivek gami
vivek gami

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What is Pedestal in Column? What is the minimum steel criteria of it?

  1. nikeetasharma

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    Added an answer on November 22, 2020 at 3:44 pm

    When the height of member is less than 3times the least lateral dimensions of column it is termed as pedestal whereas when the value is greater than 3times least lateral dimension it is termed as column. For Pedestals (whose effective length is less than three times the least lateral dimension) theRead more

    When the height of member is less than 3times the least lateral dimensions of column it is termed as pedestal whereas when the value is greater than 3times least lateral dimension it is termed as column.

    For Pedestals (whose effective length is less than three times the least lateral dimension) the minimum reinforcement is specified as 0.15 percent cross sectional area of concrete.

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Asked: April 28, 2019In: Foundation

Settlement of spread footing foundation under loads

AKM59
AKM59

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If we have two spread footing foundation (Isolated Pads) of square sizes (1m x 1m) and (2m x 2m),with axial loads ; (10t) and (40t) respectively, by assuming the soil features and specification for the two pads ,is the same ...

  1. aviratdhodare

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    Added an answer on August 13, 2020 at 1:11 pm

    Since the dimentions and magnitude of the 2nd is more than the first one, the settlement would not be same roughly. Bcoz the dimension are twice the 1st one, Magnitude is 4 times the 1st one. So bcoz of this, obviously the 2nd footing will be settled more.

    Since the dimentions and magnitude of the 2nd is more than the first one, the settlement would not be same roughly.

    Bcoz the dimension are twice the 1st one, Magnitude is 4 times the 1st one.

    So bcoz of this, obviously the 2nd footing will be settled more.

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Asked: July 27, 2020In: Foundation

On what basis is the pile foundation recommended?

Emmyvin
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On what basis is the pile foundation recommended?

  1. nikeetasharma

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    Added an answer on November 24, 2020 at 4:09 pm

    Pile foundations are used on the following situations :- - When there is a layer of weak soil at the surface.This layer cannot support the weight of the building, so the loads of the building have to bypass this layer and be transferred to the layer of the stronger soil or rock that is below the weaRead more

    Pile foundations are used on the following situations :-

    – When there is a layer of weak soil at the surface.This layer cannot support the weight of the building, so the loads of the building have to bypass this layer and be transferred to the layer of the stronger soil or rock that is below the weak layer.

    – When a building has a very heavy, concentrated loads, such as in a high rise structure, bridge or water tank.

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Asked: November 1, 2017In: Foundation

Movement of Groundwater and its Effects on Foundation Design

Gopal Mishra
Gopal Mishra

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What is the effect of groundwater movement on design of pile foundations? How to manage groundwater movements to prevent its future movements?

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