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aviratdhodare
aviratdhodare

aviratdhodare

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What are the advantages of using a steel tube rather than solid section steel?

  1. nikeetasharma

    nikeetasharma

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    Some of the advantages of using a steel tube rather than solid section steel are :- 1. Less Steel used so less cost. 2. Less Weight for a given design strength. 3. Less Weight for a given Length.

    Some of the advantages of using a steel tube rather than solid section steel are :-

    1. Less Steel used so less cost.

    2. Less Weight for a given design strength.

    3. Less Weight for a given Length.

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Komal Bhandakkar
Komal Bhandakkar

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What is the substitute material of ballast at railway track?

  1. AdityaBhandakkar

    AdityaBhandakkar

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    What is the substitute material of ballast at railway track?

    Hi, Ballast types depend upon the traffic and spacing and size of ties. The following are the materials used as a substitute for ballast : Ballast is a base for rails that are made up of stone used to hold the railway track on its position when loading from the railway's impact on the railway track.Read more

    Hi,

    Ballast types depend upon the traffic and spacing and size of ties.

    The following are the materials used as a substitute for ballast :

    Ballast is a base for rails that are made up of stone used to hold the railway track on its position when loading from the railway’s impact on the railway track.

    • Now it is instead of stone a cement concrete ballast is used. It has a long life and High durability.
    • In ancient days, wood ballast was used.
    • Steel sections are also used as a ballast for railways tracks.
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Komal Bhandakkar
Komal Bhandakkar

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Why water is not used to find specific gravity of cement?

  1. nikeetasharma

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    If a cement has exposed to extreme moisture content then the specific gravity of cement will differ because of the moisture content present in the pores. Every material has solid particles and pores which may contain water in it. So it is essential to determine the specific gravity of cement beforeRead more

    If a cement has exposed to extreme moisture content then the specific gravity of cement will differ because of the moisture content present in the pores. Every material has solid particles and pores which may contain water in it. So it is essential to determine the specific gravity of cement before using it.

    Water is not used in the testing of specific gravity of cement because cement reacts with water and forms compounds. Thus, the quantities measured prior to the commencement of test will not be same after the test.

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Komal Bhandakkar
Komal Bhandakkar

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What is the substitute material of ballast at railway track?

  1. nikeetasharma

    nikeetasharma

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    Ballast also holds the track in place as the trains roll over. It is typically consists of crushed stone, although other less suitable, materials have sometimes been used such as burnt clay.

    Ballast also holds the track in place as the trains roll over. It is typically consists of crushed stone, although other less suitable, materials have sometimes been used such as burnt clay.

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Komal Bhandakkar
Komal Bhandakkar

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Sugar is act as an accelerator or retarder in concrete?

  1. Preet Chovatiya

    Preet Chovatiya

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    Sugar meddles with the concrete restricting cycle in the solid. Note that solid and concrete are not equivalent. Concrete is made by consolidating concrete, water and a filler material called a "total," like rock or sand. Most concrete is produced using limestone and dirt. It responds with water toRead more

    Sugar meddles with the concrete restricting cycle in the solid. Note that solid and concrete are not equivalent. Concrete is made by consolidating concrete, water and a filler material called a “total,” like rock or sand. Most concrete is produced using limestone and dirt. It responds with water to frame a solidifying glue that ties the total together to create hard concrete. This solidifying cycle is called hydration.

    One hypothesis recommends that when the solid combination contains sugar, the sugar particles connect themselves to the hydrating solidify and repress the synthetic responses associated with hardening the material.

    sugar builds the centralizations of calcium, aluminum, and iron in concrete. The sugar particles consolidate with these metals to frame insoluble compound buildings that coat the concrete grains. A few key synthetic cycles that solidify the solid are then hindered. Hydration hinders the cycle and the solid takes more time to set. Thus, sugar is known as a retarder. Retarders increment the setting season of cement.

    Refined white sugar is extraordinary compared to other retarders. Lactose, the sugar found in milk, is a moderate retarder. Trehalose, a sugar created by different parasites, is non-hindering and doesn’t influence setting time.

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Komal Bhandakkar
Komal Bhandakkar

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Difference between OPC 53 &OPC 43 grade of cement according to the initial and final setting time of cement.

  1. nikeetasharma

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    OPC 43 :- The 43 grade OPC is the most popular general-purpose cement in the country today. The production of 43 grade OPC is nearly 50% of the total production of cement in the country. This OPC43 continues to gain strength after 28 days. OPC 53 :- The 53 grade OPC is higher strength cement to meetRead more

    OPC 43 :- The 43 grade OPC is the most popular general-purpose cement in the country today. The production of 43 grade OPC is nearly 50% of the total production of cement in the country. This OPC43 continues to gain strength after 28 days.

    OPC 53 :- The 53 grade OPC is higher strength cement to meet the needs of the consumer for higher strength concrete. As per BIS requirements the minimum 28 days compressive strength of 53 grade OPC should not be less than 53 Mpa. Therefore, there is a vast difference in setting time of these cements. It sets very quicker and has low initial setting time. These types of cement can be used where rapid hardening is not needed.

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Komal Bhandakkar
Komal Bhandakkar

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Explain the Curing method of concrete with of addition of Hydrogel?

  1. Komal Bhandakkar

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    Explain the Curing method of concrete with of addition of Hydrogel?

    Curing of concrete with hydrogel: Basically curing is one of the chemical processes in the field of polymer chemistry and is widely used in civil engineering to harden the cementitious material bi crosslinking of various polymer chains. Hydrogel consists of various polymeric compounds which are capaRead more

    Curing of concrete with hydrogel:

    Basically curing is one of the chemical processes in the field of polymer chemistry and is widely used in civil engineering to harden the cementitious material bi crosslinking of various polymer chains.

    Hydrogel consists of various polymeric compounds which are capable of holding water in their three-dimensional network.

    The hydrogel is a wound-healing material. Following precaution should be taken while curing,

    • Apply the curing process as soon as possible because the delay of a few hours may create a substantial difference.
    • In windy conditions, the spray-on curing membranes method is not more effective.
    • In difficult areas like columns, membrane curing is an appropriate option.
    • PFA, GGBS and CSF need better curing of long-span i.e. up to 5days.
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Asked: In:
Komal Bhandakkar
Komal Bhandakkar

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How to check the purity of cement?

  1. nikeetasharma

    nikeetasharma

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    The purity of cement can be checked by following ways :- 1. RUBBING :- Take a small quantity of cement between your fingers and rub it. It must feel smooth while rubbing but if it feels rough than adulteration with sand. 2. HAND INSERTION :- Insert your hand into the cement bag and it should give coRead more

    The purity of cement can be checked by following ways :-
    1. RUBBING :- Take a small quantity of cement between your fingers and rub it. It must feel smooth while rubbing but if it feels rough than adulteration with sand.

    2. HAND INSERTION :- Insert your hand into the cement bag and it should give cool feeling. Hence this cool feeling indicates that there is no hydration reaction is taking place in the bag.

    3. FLOAT TEST :- It is tested by throwing a small quantity of cement in a bucket of water. Thus it should sink and should not float on the surface.

    4. SMELL TASTE :- Take some quantity of cement and smell it. If the cement contains too much of pounded clay and silt as an adulterant, the paste will give an earthy smell.

    5. PRESENCE OF LUMPS :- See that the lumps should not be present in the bag while opening the bag. Thus it ensures that no setting has taken place.

    6. COLOUR :- Basically, the cement should be uniform in colour. Generally the colour of cement is grey with a light greenish shade. The colour of cement gives an indication of excess lime or clay and the degree of burning.

    7. DATE OF PACKING :- Date of manufacturing should be seen on the bag. It is most important because the strength of cement reduces with age.

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