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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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    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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keralitecivilengineer
keralitecivilengineer

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When is scarification needed for road work?

  1. Kuldeep Singh

    Kuldeep Singh

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    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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Muhammad Ariful Islam
Muhammad Ariful Islam

Muhammad Ariful Islam

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What are the factors responsible for the deform of RCC road?

  1. nikeetasharma

    nikeetasharma

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    There are many factors which are responsible for the deformation of RCC roads ; -Shrinkage cracks - Damaged portion of rigid pavements - Durability cracks - Effect of pumping - Faults in rigid pavements - Uneven curing - Delaying in pavements

    There are many factors which are responsible for the deformation of RCC roads ;
    -Shrinkage cracks
    – Damaged portion of rigid pavements
    – Durability cracks
    – Effect of pumping
    – Faults in rigid pavements
    – Uneven curing
    – Delaying in pavements

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SNPH
SNPH

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What is the mobilization & demobilization cost of any project, in percentage?

  1. Soumyadeep Halder

    Soumyadeep Halder

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    Mobilization and demobilization costs can vary greatly depending on the type of work being performed and what level of costs and logistics will be required to get the job rolling. So, there isn’t really one rule of thumb to follow on all projects. But, mobilization should represent the actual costsRead more

    Mobilization and demobilization costs can vary greatly depending on the type of work being performed and what level of costs and logistics will be required to get the job rolling. So, there isn’t really one rule of thumb to follow on all projects.

    But, mobilization should represent the actual costs of accumulating and coordinating all the necessary equipment, tools, materials, etc. – it shouldn’t typically be made up independently and without a sound basis. With that being said, mobilization costs tend to be under 10% and even as low as 2%. And as mentioned above, that should be pretty tightly tied to the actual costs of mobilizing and demobilizing the job.

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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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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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    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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