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Discy Latest Questions

Asked: July 22, 2020In: Concrete

What is Cement Gel in Concrete?

vivek gami
vivek gami

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What is Cement Gel in Concrete?

  1. nikeetasharma

    nikeetasharma

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    Added an answer on December 17, 2020 at 3:44 pm

    The cement gel in a cement is generally known as calcium silicate hydrate (CSH). It helps in strength and binding property. The production of cement gel occurs when a hydration reaction occurs by mixing water and cement; the paste so formed is called as cement gel.

    The cement gel in a cement is generally known as calcium silicate hydrate (CSH). It helps in strength and binding property. The production of cement gel occurs when a hydration reaction occurs by mixing water and cement; the paste so formed is called as cement gel.

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Asked: April 23, 2021In: Concrete

What is the effect on strength of concrete if an RMC transit mixer is halted for 3 hours?

Vasu tanniru
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What is the effect on strength of concrete if an RMC transit mixer is halted for 3 hours?

  1. Fasi Ur Rahman

    Fasi Ur Rahman

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    Fasi Ur Rahman
    Added an answer on April 23, 2021 at 2:15 pm

    The first thing we need to know is the amount of retarder used for the preparation of concrete. Generally, the concrete starts to harden after 30mins of adding water into it. By the use of a retarder, the setting time of the concrete is delayed. Generally, for RMC mix concrete the setting time startRead more

    The first thing we need to know is the amount of retarder used for the preparation of concrete. Generally, the concrete starts to harden after 30mins of adding water into it.
    By the use of a retarder, the setting time of the concrete is delayed. Generally, for RMC mix concrete the setting time starts after 4hrs.
    Thus, in your case, there shall be no effect on the strength of concrete.
    But it is advised to check the slump of the concrete before pouring.

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Asked: July 10, 2020In: Concrete

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

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

  1. Kuldeep Singh

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    Added an answer on July 13, 2020 at 8:44 pm
    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.

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Asked: July 22, 2020In: Concrete

Why are 6 cubes cast for testing the Compressive Strength?

Tips_and_tricks
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Why are 6 cubes cast for testing the Compressive Strength?

  1. Kuldeep Singh

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    Added an answer on July 23, 2020 at 1:21 pm

    Whenever testing for cube strength, it is always advised to make and test three specimens from the same mix. This is done to reduce or average out the error due to manually introduced differences in the three cubes. Now, concrete and cement are always tested at both 7 days and 28 days for compressivRead more

    Whenever testing for cube strength, it is always advised to make and test three specimens from the same mix. This is done to reduce or average out the error due to manually introduced differences in the three cubes.

    Now, concrete and cement are always tested at both 7 days and 28 days for compressive strength. The compressive strength at seven days is known to be 65% of the final (28 days) strength. This double testing is done so that if the seven days strength is found inappropriate, the cubes may be straight away discarded to save 21 days’ time because the 28-day strength will also probably be below par. Now, a time even earlier than seven days is not chosen because, at that age, strength gain is very steep, and there’s a higher margin of error. Also, seven days is a round figure.

    For both the tests, 3 cubes each are employed. Hence, a total of 6 cubes go through the compression test.

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Asked: September 19, 2020In: Concrete

what is the need to design a mix in concrere

Komal Bhandakkar
Komal Bhandakkar

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 what is the need to design a mix concrete ?

  1. nikeetasharma

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    Added an answer on December 17, 2020 at 4:03 pm

    Good concrete mix design creates the foundation of a sound infrastructure. Concrete mix design involves a process of preparation in which a mix of ingredients creates the required strength and durability for the concrete structure.

    Good concrete mix design creates the foundation of a sound infrastructure. Concrete mix design involves a process of preparation in which a mix of ingredients creates the required strength and durability for the concrete structure.

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Asked: July 22, 2020In: Concrete

Why does modulus of elasticity of concrete reduce with time?

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

  1. CB Sowmya

    CB Sowmya

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    Added an answer on July 22, 2020 at 11:27 am

    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!

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Asked: September 22, 2020In: Concrete

Translucent Concrete means what?

Komal Bhandakkar
Komal Bhandakkar

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Translucent Concrete means what?

  1. aviratdhodare

    aviratdhodare

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    Added an answer on September 24, 2020 at 6:28 pm

    Translucent concrete It is also called as Transparent concrete or Light transmitting concrete. Translucent concrete is achieved by replacing aggregates with transparent alternative materials. This transparent appearance is mainly due to the uniform distribution of high numerical aperture plastic optRead more

    Translucent concrete
    It is also called as Transparent concrete or Light transmitting concrete. Translucent concrete is achieved by replacing aggregates with transparent alternative materials. This transparent appearance is mainly due to the uniform distribution of high numerical aperture plastic optical fibers (POF) throughout its body.
    The concrete is formed by mixing of fine concrete, i.e., cement & fine aggregate with optical fibers. These fibers blend into the concrete like any other aggregates. These optical fibers have the capacity to transmit the light from the source into the space enclosed by panels.
    The thickness of the optical fibers can be in 2μ – 2mm. The main reason to use optical fiber is that it can emit light even at incident ∠ >60°. Using these does not have any impact on the properties of concrete compared to normal ones. It is commonly used in the construction of green buildings.
    Since it can emit light, this type of concrete is considered an energy-saving method of construction. It provides a good aesthetical appearance to the building. But casting of this type of concrete needs skilled labor, and cost is somewhat high.

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Asked: July 22, 2020In: Concrete

What is meant by Dry Shrinkage?

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What is meant by Dry Shrinkage? How to prevent it? How is it different from creep?

  1. CB Sowmya

    CB Sowmya

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    Added an answer on July 22, 2020 at 6:19 pm

    Dry shrinkage or drying shrinkage occurs due to loss of moisture in the concrete. There are different types of water in a hydrated cement paste. Dry shrinkage occurs due to the loss of capillary water. This water can be found in voids of sizes ranging from 5 nm to 50 nm in the hydrated cement paste.Read more

    Dry shrinkage or drying shrinkage occurs due to loss of moisture in the concrete. There are different types of water in a hydrated cement paste. Dry shrinkage occurs due to the loss of capillary water.

    This water can be found in voids of sizes ranging from 5 nm to 50 nm in the hydrated cement paste. Due to the small size of the voids, the water is held inside by surface tension or capillary tension. Due to the bond created by the surface tension, evaporation, or any other form of removal of this water causes significant volume changes to the structure. This volume changes causes dry shrinkage to the structure.

     

    Thanks!

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