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Asked: June 20, 2020In: Construction Site Related

Can a foot compactor achieve the soil density of G45?

casto
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Can a foot compactor achieve the soil density of G45?

  1. casto

    casto

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    Added an answer on September 8, 2020 at 11:23 pm

    @komal i think  G45 is not equivalent to 45 Mpa.

    @komal i think  G45 is not equivalent to 45 Mpa.

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Asked: November 13, 2017In: Construction Site Related

For flooring of tiles which sand is best crushed or natural?

Gopal Mishra
Gopal Mishra

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What are the different advantages and disadvantages of artificial and natural sand for flooring of tiles? Which one is suitable ?

  1. aviratdhodare

    aviratdhodare

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    aviratdhodare
    Added an answer on October 3, 2020 at 11:25 am

    River sand M sand Shape is round & smooth Shape is cubical, angular & rough texture Less cement paste is reqd to make concrete Req’s more water & cement Sand has high cost but using it makes work economical Sand is cheaper but using it will make it increased cost Contains less microfineRead more

    River sand M sand
    Shape is round & smooth Shape is cubical, angular & rough texture
    Less cement paste is reqd to make concrete Req’s more water & cement
    Sand has high cost but using it makes work economical Sand is cheaper but using it will make it increased cost
    Contains less microfine particles Contains more microfine particles
    Doesn’t affect any property, best choice Affects strength & workability of cocrete
    Moisture content present Less or no moisture content
    Strength is less High comp strength & flexural strength but should be well graded.
    Slit & over-sized materials& marine products present should be removed by washing & screening. No slit & over-sized materials & marine products
    Used for RCC, plastering & Brick or block laying work Diff grades is used for diff works.

     

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Asked: August 2, 2020In: Construction Site Related

What is the difference between Grit and Aggregate?

vivek gami
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What is the difference between Grit and Aggregate?

  1. aviratdhodare

    aviratdhodare

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    Added an answer on January 5, 2021 at 1:49 pm

    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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Asked: July 27, 2020In: Construction Site Related

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

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

  1. nikeetasharma

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    Added an answer on November 12, 2020 at 8:09 pm

    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: May 16, 2020In: Construction Site Related

Admixtures in concrete for to Delay Setting Times

Ramesh Kumar
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How to calculate admixture for transporting concrete for long distances to delay setting time in case of long-distance transportation in transit mixers?

  1. Komal Bhandakkar

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    Added an answer on October 5, 2020 at 10:21 pm

    The admixture which we use in the concrete for delaying its setting time then such type of admixtures are called as retarders. Gypsum is a retarding agent which we add in the cement during its manufacturing process. Gypsum is work as a starting agent as well as it restricts soundness in the cement.Read more

    The admixture which we use in the concrete for delaying its setting time then such type of admixtures are called as retarders.

    Gypsum is a retarding agent which we add in the cement during its manufacturing process.

    Gypsum is work as a starting agent as well as it restricts soundness in the cement.

    Apart from gypsum of various admixtures already listed in some previous post.

    The chemical name of gypsum is calcium sulphate.


    Thank you.

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Asked: November 5, 2017In: Construction Site Related

Difference between OPC and PPC Cements and Which is Best?

Gopal Mishra
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What is the difference between Ordinary Portland cement and Pozzolana Portland Cement?  Which one is best for concrete works?

  1. aviratdhodare

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    Added an answer on September 22, 2020 at 1:48 pm

    Particulars OPC PPC Name Ordinary Portland Cement Portland Pozzolana Cement IS Codes OPC 33 Grade Cement is IS: 269, for 43 Grade Cement IS: 8112 is used and for 53 Grade Cement IS: 12269 PPC IS 1489 (part 1 & 2) 1991 Ingredients & Manufacturing process Cement is made by heating limestone (CRead more

    Particulars OPC PPC
    Name Ordinary Portland Cement Portland Pozzolana Cement
    IS Codes OPC 33 Grade Cement is IS: 269, for 43 Grade Cement IS: 8112 is used and for 53 Grade Cement IS: 12269 PPC IS 1489 (part 1 & 2) 1991
    Ingredients & Manufacturing process Cement is made by heating limestone (CaCO3 & clay) to 1450oC in a kiln & grounded with gypsum. Pozzolana materials like fly ash, volcanic ash are blended to OPC @ 15%-35% by wt.
    Environmental impact Uses limestone clay & gypsum which are natural stones & emits CO2 during making. Consumes industrial wastes such as fly ash, bf slag, etc. & is environment friendly.
    Grades available 33, 43, 53 Grades Don’t have any grade but attains strength of 33 grade cement on 228 days curing. After that its strength gain slows down.
    Cost per unit Costly compared to PPC due to limestone Cheaper bcoz limestone replaced by pozzolana
    Sulphate resistance Less durable in aggressive weather & sulphate attack & hence not preferred for marine structures, hydraulic structures, sewages pipes, etc. Highly resistant to sulphate & used & preferred for marine structures, hydraulic structures, sewages pipes, etc.
    Permeability & Durability Low fineness, permeability is less Higher fineness, higher permeability, result high durability.
    Setting time Initial setting time: 30mins

    Final setting time: 280mins

    Initial setting time: 30mins

    Final setting time: 600mins

    Construction speed Faster construction speed as it gains strength early. Gains strength with time.
    Fineness OPC has finiteness of 225 sq.m/kg. It has lower fineness than PPC. So, it has higher permeability resulting lower durability. PPC has finiteness of 300 sq.m/kg. It has higher fineness than OPC. So, it has lower permeability resulting in higher durability.
    Heat of Hydration It contains active salt hence more Heat of Hydration. Don’t have blended material & it gains 95% early strength in 7 days. Blended cement with flyash or slag, etc. Low heat of hydration. Gains 75% strength in 7 days & 90% strength in 14 days.
    Shrinkage cracks Will be more due to high heat of hyudration Less shrinkage cracks
    Workability Lower Lower
    Mass concrete Not preferred Preferred for mass concreting

     

     

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Asked: July 15, 2020In: Construction Site Related

What is the difference between Lumpsum and Provisional Sum?

fathima
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What is the difference between Lumpsum and Provisional Sum?

  1. DevilAVRT

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    Added an answer on July 17, 2020 at 5:09 pm

    Lumpsum A lumpsum contract (or specified total agreement) is the customary method for acquiring development and still the most well-known type of development contract. Under a singular amount contract, a solitary 'single amount' cost for all the works has concurred before the works start. This is coRead more

    Lumpsum

    A lumpsum contract (or specified total agreement) is the customary method for acquiring development and still the most well-known type of development contract. Under a singular amount contract, a solitary ‘single amount’ cost for all the works has concurred before the works start. This is commonly fitting where the venture is very much characterized, when tenders are looked for, and noteworthy changes to necessities are impossible. This implies the temporary worker can precisely value the works they are being approached to complete. Lumpsum contracts may be less suitable where speed is significant, or where the idea of the works isn’t very much characterized. Different types of agreement that may be increasingly suitable in such conditions incorporate estimation contracts (utilized where the works can be depicted in sensible detail, yet the sum can’t), cost repayment contracts (utilized where the idea of the works can’t be appropriately characterized at the beginning, frequently utilized where a prompt beginning nearby is required), target cost contracts, etc.

    Focal points of lumpsum contracts:

    • Customer’s hazard is insignificant.
    • Less varieties.
    • The customer can orchestrate capital as indicated by the installment plan.
    • Temporary worker’s income is unsurprising.
    • The offering procedure is increasingly straightforward and unprejudiced.

    Impediments of lumpsum contracts:

    • Contractual workers chance is high (helpless profitability and bungle can lead the undertaking into a misfortune).
    • Helpless subtleties and specs in the structure can prompt venture debates.
    • Deferrals in the customer’s financing can postpone the undertaking.
    • The structure ought to be finished and accessible before the pre-contract process.
    • Obtainment times can be long.

    Provisional Sum

    The term ‘provisional sum’ is commonly surely known in the development business. It is utilized in valuing development agreements to allude either to work which is really temporary, as in it could conceivably be done by any means, or to work whose substance is unclear, with the goal that the gatherings choose not to attempt to value it precisely when they go into their agreement. A provisional sum is typically included as a round figure surmise. It is incorporated scientifically in the first agreement cost; however, the gatherings don’t anticipate that the underlying round figure should be paid without modification. The agreement normally gives explicitly how it is to be managed. A typical statement in substance accommodates the temporary whole to be discarded, and a fitting valuation of the work really did to be fill in for it. In this general sense, the term ‘temporary aggregate’ is near a term of workmanship, yet its exact significance and impact rely upon the conditions of the individual agreement.

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Asked: June 8, 2020In: Construction Site Related

What Type of Reinforcement is used in Prestressing Concrete?

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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    Added an answer on June 9, 2020 at 8:02 am

    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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