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Gopal Mishra
Gopal Mishra

Gopal Mishra

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What must be the maximum dry density of Granular Sub Base & Wet Mix Macadam used in Road Construction?

  1. Fasi Ur Rahman

    Fasi Ur Rahman

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    Fasi Ur Rahman

    The maximum dry density of  Granular Sub Base used in Road Construction must be  2100 Kg/Cum. The maximum dry density of Wet Mix Macadam used in Road Construction must be 2230 Kg/Cum.  

    The maximum dry density of  Granular Sub Base used in Road Construction must be  2100 Kg/Cum.
    The maximum dry density of Wet Mix Macadam used in Road Construction must be 2230 Kg/Cum.

     

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Vivek Patel
Vivek Patel

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What is difference between Asphalt and Bitumen?

  1. Kamlaksha Rana

    Kamlaksha Rana

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    Kamlaksha Rana Beginner
    What is difference between Asphalt and Bitumen?

    In simple words, bitumen is a liquid that binds together asphalt. Asphalt-It is a mixture prepared by adding aggregates(sand, gravel, slag, crushed rocks) with appropriate binders like bitumen. Then it is laid down on-site to a decided level or thickness by a paving machine. Bitumen- This is the heaRead more

    In simple words, bitumen is a liquid that binds together asphalt.

    Asphalt-It is a mixture prepared by adding aggregates(sand, gravel, slag, crushed rocks) with appropriate binders like bitumen. Then it is laid down on-site to a decided level or thickness by a paving machine.

    Bitumen- This is the heavy semi-solid hydrocarbon produced by the distillation of crude oil.

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keralitecivilengineer
keralitecivilengineer

keralitecivilengineer

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When is scarification needed for road work?

  1. Kuldeep Singh

    Kuldeep Singh

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    Kuldeep Singh Learner

    I assume you are talking about flexible (asphalt) pavements. Sacrification is needed when the cuts, potholes and all deformations are such that : The optimum moisture content required for proper binding can no longer be met. The filler material won't bend properly if just put judging by the conditioRead more

    I assume you are talking about flexible (asphalt) pavements. Sacrification is needed when the cuts, potholes and all deformations are such that :

    • The optimum moisture content required for proper binding can no longer be met.
    • The filler material won’t bend properly if just put judging by the condition of the pavement.
    • The peak daily traffic on the road, does not permit it to be safe without reconstruction.

    The entire bituminous layer until the depth of the craters is scraped off, and a new layer with fresh material is then applied to reconstruct the road.

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AdityaBhandakkar
AdityaBhandakkar

AdityaBhandakkar

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What is the difference between Highway and Airfield pavement?

  1. Vivek Patel

    Vivek Patel

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    Vivek Patel User

    Comparison of both is Highway pavement Cost is low. Less toughness compare to airfield. Design load is less. Less hardness compare to airfield. Compare to airfield, less construction cost and design cost. Length of Highway payment is very high. Airfield pavement Cost is high. High toughness need. DeRead more

    Comparison of both is

    Highway pavement

    • Cost is low.
    • Less toughness compare to airfield.
    • Design load is less.
    • Less hardness compare to airfield.
    • Compare to airfield, less construction cost and design cost.
    • Length of Highway payment is very high.

    Airfield pavement

    • Cost is high.
    • High toughness need.
    • Design load is very High
    • Need higher resistant to wear and tear due to aircraft trust.
    • Design cost and material cost is high due to rigid specifications and high level of construction practice.
    • Length of airfield pavement is less compare to Highway pavement.
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Fasi Ur Rahman
Fasi Ur Rahman

Fasi Ur Rahman

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What is the Diference between Semi Dense Bituminous Macadam (SDBC) and Bituminous Macadam (BM)?

  1. MohamedAquib

    MohamedAquib

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    MohamedAquib User

    Bituminous Macadam is a Binder which is used for the 24-meter & 12-meter roads where the traffic movement is heavy. This can be laid in two or more courses for the better compressive strength. This shall comprise of 5 TO 7 percentage of bitumen. Semi Dense Bituminous Macadam is a binder that isRead more

    Bituminous Macadam is a Binder which is used for the 24-meter & 12-meter roads where the traffic movement is heavy. This can be laid in two or more courses for the better compressive strength. This shall comprise of 5 TO 7 percentage of bitumen.

    Semi Dense Bituminous Macadam is a binder that is laid after the BM course to obtain smoother finish on road surfaces. This is used in small roads of width less than 9 Meters. This course is laid directly on the wet mix macadam in smaller roads with a thickness of 25-30 mm. This shall comprise of 3 to 5 percentage of Bitumen.

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Naif Alwadai
Naif Alwadai

Naif Alwadai

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What is the difference between Airport, Aerodrome and Airfield?

  1. desvl

    desvl

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    desvl VVIP

    Airport: A place often with multiple runways where commercial aircraft regularly take off and land usually based on a schedule, it has buildings for passengers flight management (Control tower) and services such as refueling, maintenance etc. An airport is normally a commercial enterprise. An AirfieRead more

    Airport: A place often with multiple runways where commercial aircraft regularly take off and land usually based on a schedule, it has buildings for passengers flight management (Control tower) and services such as refueling, maintenance etc. An airport is normally a commercial enterprise.

    An Airfield is on a much smaller scale usually non commercial and used for private or irregular charter flights minimal runways and limited services can also be military. minimal if any control.

    An Aerodrome is an old English word that has been replace with the word airfield so aerodrome and airfield are the same.

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Neenu S K
Neenu S K

Neenu S K

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What is the Coefficient of Subgrade Reaction?

  1. nikeetasharma

    nikeetasharma

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    nikeetasharma Guru

    The coefficient of subgrade reaction is referred as the ratio between the pressure against the footing or mat and the settlement at a given point expressed as the coefficient of subgrade reaction which is defined as the ratio between the pressure against the footing or mat and the settlement at a giRead more

    The coefficient of subgrade reaction is referred as the ratio between the pressure against the footing or mat and the settlement at a given point expressed as the coefficient of subgrade reaction which is defined as the ratio between the pressure against the footing or mat and the settlement at a given point which is expressed as ;
    ks = q/S

    where,
    ks = coefficient of subgrade reaction
    q = pressure on the footing or mat at a given point
    S = settlement of the same point of the footing or mat in the corresponding unit of length

    i. The value of k is independent of the magnitude of pressure.
    ii. The value of s has the same value for every point on the surface of the footing.

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vivek gami
vivek gami

vivek gami

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What is the difference between Tar and Bitumen?

  1. Abbas Khan Civil Engineer

    Abbas Khan Civil Engineer

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    Abbas Khan Civil Engineer Learner

    Bitumen; BITUMEN is a petroleum product formed by the process of distillation of crude petroleum. It is available both in solid and liquid form. It is providing a good grip to the tyres as compared to the coal tar. Bitumen is available in three types that is; Rapid Setting, Slow Setting and Medium sRead more

    Bitumen;

    BITUMEN is a petroleum product formed by the process of distillation of crude petroleum. It is available both in solid and liquid form. It is providing a good grip to the tyres as compared to the coal tar. Bitumen is available in three types that is; Rapid Setting, Slow Setting and Medium setting. In the modern era, we used bitumen instead of Coal Tar because Coal Tar is Carcinogenic.

    COAL TAR; Coal tar is derived from the coal.It is a black viscous liquid used as a sealing agent in old roads making all over the world. It is not used in the current era, due to the carcinogenic product. It is produced through the process of destructive distillation in the absence of air. Coal Tar not provide enough grip to the tyres of the vehicle and heat up quickly causes wearing out of tyres.

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