Concrete

Home/Concrete

Do you need to remove the ads? Get the paid membership

Discy Latest Questions

Asked: In:
dhiraj010kumar
dhiraj010kumar

dhiraj010kumar

View Profile
User

While preparing a Design Mix for any Grade, if we have aggregated in two sizes like 10 mm & 20 mm or In fact Sometimes, we do use to have 40 mm aggregate as well. Is there Any IS Code Provision ...

  1. dbnalawade

    dbnalawade

    View Profile
    dbnalawade Expert

    Following points part of the answer to the question : IS 456  and IS 1343 are the code of practice you can use. The method of proportions aggregates for concrete is part design mix process. Size and Grading impacts the design mix greatly. larger the size of aggregate smaller is the cement requiremenRead more

    Following points part of the answer to the question :

    • IS 456  and IS 1343 are the code of practice you can use.
    • The method of proportions aggregates for concrete is part design mix process.
    • Size and Grading impacts the design mix greatly.
    • larger the size of aggregate smaller is the cement requirement for a given W/C ratio
    • Compressive strength of the mix tends to increase with decrease in aggregate size.
    • perform gradation tests using sieves. Coarse aggregates should conform to table 2 of IS 383 and Fine aggregate should conform to Zone 1 of IS 383

    There is ACI method available for the same exercise ACI 211.1is the code you can use.

     

    Hope this helps.

     

    See less
    • 0
Asked: In:
Gopal Mishra
Gopal Mishra

Gopal Mishra

View Profile

What is polymer concrete?

  1. Fasi Ur Rahman

    Fasi Ur Rahman

    View Profile
    Fasi Ur Rahman

    Polymer cement concrete is a composite concrete that consists of synthetic polymer within the binding material. Polymer concrete has advantages of higher properties, low energy requirements, and low labor costs. It is also called Polymer Portland cement concrete (PPCC) or latex-modified concrete (LMRead more

    Polymer cement concrete is a composite concrete that consists of synthetic polymer within the binding material. Polymer concrete has advantages of higher properties, low energy requirements, and low labor costs. It is also called Polymer Portland cement concrete (PPCC) or latex-modified concrete (LMC).

    Read more on polymer concrete-

    Polymer Cement Concrete: Properties and Uses

     

    See less
    • 4
Asked: In:
Tips_and_tricks
Tips_and_tricks

Tips_and_tricks

View Profile
Learner

Why does the modulus of elasticity of concrete reduce with time?

  1. CB Sowmya

    CB Sowmya

    View Profile
    Best Answer
    CB Sowmya User

    The Modulus of Elasticity reduces with time because of the effect of creep. Creep is the phenomenon that occurs in hardened concrete over time, where for constant load or stress, deformation increases. Keeping that in mind, let us look at the definition of modulus of elasticity of concrete. It is thRead more

    The Modulus of Elasticity reduces with time because of the effect of creep. Creep is the phenomenon that occurs in hardened concrete over time, where for constant load or stress, deformation increases.

    Keeping that in mind, let us look at the definition of modulus of elasticity of concrete. It is the slope of the initial tangent modulus of the stress-strain curve of concrete.

    The above graph shows the stress-strain curve of the concrete at an early stage.

     

    Due to creep, for a given load/stress, deformation increases, thereby strain increases. This has been explained in the following graph.

    As a result, the slope of the curve reduces and becomes like this.

     

    As the curve descends, the slope of the initial tangent modulus of the stress-strain curve of concrete reduces.

    As a result, the modulus of elasticity also reduces.

     

    Thank you!

    See less
    • 3
Asked: In:
saifalnahwy
saifalnahwy

saifalnahwy

View Profile
User

What is the difference between Self Levelling Concrete and Self Compacting Concrete?

  1. AdityaBhandakkar

    AdityaBhandakkar

    View Profile
    AdityaBhandakkar User

    In simple words, Self-levelling concrete is a concrete which has a higher slump value without any segregation. It levelled the paste without an additional amount of water. Self-compacting concrete is concrete with a moderate slump value. It is able to self compact and used where vibrators machineryRead more

    In simple words,

    Self-levelling concrete is a concrete which has a higher slump value without any segregation. It levelled the paste without an additional amount of water.

    Self-compacting concrete is concrete with a moderate slump value. It is able to self compact and used where vibrators machinery are not allowed to work. It avoids honeycombing structure and makes structure voids free.

    See less
    • 41
Asked: In:
Maria argent
Maria argent

Maria argent

View Profile
User

What are internationally used Sealing Methods? What are their functions?  

  1. Soumyadeep Halder

    Soumyadeep Halder

    View Profile
    Soumyadeep Halder User

    Heat sealing is used for joining thermoplastic films, typically less than 0.5 mm thick. There are two main types of heat sealing: hot-bar welding impulse welding. Hot-bar welding and impulse welding have found applications in a number of industrial sectors, but are most widely used in the packagingRead more

    Heat sealing is used for joining thermoplastic films, typically less than 0.5 mm thick.

    There are two main types of heat sealing:

    hot-bar welding

    impulse welding.

    Hot-bar welding and impulse welding have found applications in a number of industrial sectors,

    but are most widely used in the packaging industry for sealing bags, films, and containers made from thermoplastics. This includes plastic pot and tray sealing for food packaging applications. Many medical devices are also heat-sealed in packages of thermoplastic and plastic coated paper.

    The heated region is textured to reduce and control the joint strength. This offers the opportunity to supply a sterile component in an easy-to-open package.

    Outer packets for intravenous bags, laminated packs for powders, colostomy bags, and some tablet blister packs are also heat-sealed. In addition to medical and packaging applications, some electronic devices are also joined together by heat sealing, including printed  circuit boards, electronic packages, and liquid crystal displays. Unlike some welding and sealing techniques, such as radio frequency welding, heat sealing is not material dependent, and is used for joining many different types of thermoplastic materials.

    See less
    • 0
Asked: In:
Rohan Chaugule
Rohan Chaugule

Rohan Chaugule

View Profile
Expert

What are the different types of concrete mixers available in the market for construction.?

  1. Soumyadeep Halder

    Soumyadeep Halder

    View Profile
    Soumyadeep Halder User

    Concrete mixers can be divided into two broad categories: Batch Mixer Continuous Mixer 1. Batch Mixer Batch mixers can be further divided into two types: i) Drum Mixer Tilting Drum Mixer Non-Tilting Drum Mixer Reversing Drum Mixer ii) Pan Mixer 2. Continuous Mixer

    Concrete mixers can be divided into two broad categories:

    1. Batch Mixer
    2. Continuous Mixer

    1. Batch Mixer
    Batch mixers can be further divided into two types:

    i) Drum Mixer

    Tilting Drum Mixer
    Non-Tilting Drum Mixer

    Reversing Drum Mixer
    ii) Pan Mixer

    2. Continuous Mixer

    See less
    • 0
Asked: In:
Preet Chovatiya
Preet Chovatiya

Preet Chovatiya

View Profile
Learner

What is light emitting concrete and the purpose to provide that concrete?

  1. Kuldeep Singh

    Kuldeep Singh

    View Profile
    Kuldeep Singh Learner
    What is light emitting concrete and the purpose to provide that concrete?

    Light-emitting concrete involves the use of optical fibers within the concrete to form a mixture that emits light from the brighter side of the wall to the darker side. It is made up of concrete with relatively finer materials. Fine aggregates are actually quite fine, and the Nominal mean size of coRead more

    Light-emitting concrete involves the use of optical fibers within the concrete to form a mixture that emits light from the brighter side of the wall to the darker side.

    It is made up of concrete with relatively finer materials. Fine aggregates are actually quite fine, and the Nominal mean size of coarse aggregates isn’t exceeded 10 or 12 mm. 4% optical fibers are added in suck a way to create a kind of mesh with the fibers continuing from one face to the other, this carrying light from one facet of the other. The optical fibers very interestingly, act as the reinforcement in concrete and no steel is required.

    The reduction in compressive strength is negligible, and hence, it is quite the architect’s favorite concrete.

    See less
    • 1
Asked: In:
Komal Bhandakkar
Komal Bhandakkar

Komal Bhandakkar

View Profile
AUTHOR

How PH value of water influence in construction?

  1. aviratdhodare

    aviratdhodare

    View Profile
    aviratdhodare

    The PH value is very important in construction activities, particularly for reinforced cement concrete as it is a composite material created with embedded steel bars. If the PH value of water is less than 7 which is the neutral value for good drinking water, then the water will be acidic. The cementRead more

    The PH value is very important in construction activities, particularly for reinforced cement concrete as it is a composite material created with embedded steel bars. If the PH value of water is less than 7 which is the neutral value for good drinking water, then the water will be acidic. The cement concrete’s PH value for fresh concrete will be 12 to 13. This indicates that the concrete is alkaline which gives passivity to protect steel bars from getting corroded. If the water having less PH value than 6, it will start neutralizing the PH value of concrete from 12, to 7 and less, the long lasting alkaline passivity of concrete is considerably reduced, triggering the corrosion chmesity for steel and destroy the steel over a period.

    See less
    • 32
Load More Questions