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Asked: May 20, 2021In: Construction

What is the tolerance for compression test results of concrete, according to the standards?

AKM59
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What is the tolerance for compression test results of concrete, according to the standards?

  1. Fasi Ur Rahman

    Fasi Ur Rahman

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    Fasi Ur Rahman
    Added an answer on May 20, 2021 at 6:07 am

    According to ACI 301-1.6.6 -“The strength of concrete is satisfactory provided that every average of three consecutive strength tests (sets) equals or exceeds the specified compressive strength and no strength test (set) falls below the design strength by more than 500 psi.

    According to ACI 301-1.6.6 -“The strength of concrete is satisfactory provided that every average of three consecutive strength tests (sets) equals or exceeds the specified compressive strength and no strength test (set) falls below the design strength by more than 500 psi.

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Asked: April 24, 2021In: Construction

Is the quality of welding (shown in the picture) acceptable in column lapping?

AKM59
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Is the quality of welding (shown in the picture) acceptable in column lapping?

  1. Fasi Ur Rahman

    Fasi Ur Rahman

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    Fasi Ur Rahman
    Added an answer on April 24, 2021 at 10:00 pm
    This answer was edited.

    This is the wrong method of lapping rebars in the column. The lapping length of the rebar must be 46d.   For 16mm bar, =16 x 48 =768mm The lapping shall be shattered and not in one place.   And the welding must be done for the whole 768mm on both sides. 

    This is the wrong method of lapping rebars in the column.

    The lapping length of the rebar must be 46d.

     

    For 16mm bar,

    =16 x 48 =768mm

    The lapping shall be shattered and not in one place.  

    And the welding must be done for the whole 768mm on both sides. 

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Asked: April 28, 2019In: Foundation

Settlement of spread footing foundation under loads

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 , So ...

  1. aviratdhodare

    aviratdhodare

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    aviratdhodare
    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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