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Asked: September 23, 2020In: Concrete

How PH value of water influence in construction?

Komal Bhandakkar
Komal Bhandakkar

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How PH value of water influence in construction?

  1. aviratdhodare

    aviratdhodare

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    aviratdhodare
    Added an answer on September 29, 2020 at 5:08 pm

    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.

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Asked: September 22, 2020In: Concrete

Tell me the properties of nano-concrete?

Komal Bhandakkar
Komal Bhandakkar

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Tell me the properties of nano-concrete? What is mean by nano-concrete?

  1. AdityaBhandakkar

    AdityaBhandakkar

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    Added an answer on October 16, 2020 at 12:23 pm
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    Hi, I am a researcher in nanotechnology and its uses in construction fields. In simple words," The technology which works with nanoscale is called nanotechnology". In Civil engineering, if we can work on nanoscale, i.e. 0 to 10 nanometer, and able to change the molecular properties of cement, then tRead more

    Hi,

    I am a researcher in nanotechnology and its uses in construction fields. In simple words,” The technology which works with nanoscale is called nanotechnology”. In Civil engineering, if we can work on nanoscale, i.e. 0 to 10 nanometer, and able to change the molecular properties of cement, then that modified cement concrete is called nano-engineered cement concrete.  Nowadays, it is possible to alter the cement properties according to our use.

    1. i.e. increasing workability without increasing water content.
    2. Increasing setting time without adding any admixtures.
    3. Increasing strength without and additives. etc

     

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Asked: September 23, 2020In: Concrete

What is the Mechanism Involved in Resin Transparent Concrete?

Komal Bhandakkar
Komal Bhandakkar

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What is the Mechanism Involved in Resin Transparent Concrete?

  1. Komal Bhandakkar

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    Added an answer on September 28, 2020 at 11:25 pm
    What is the Mechanism Involved in Resin Transparent Concrete?

    Mechanism of resin transparent concrete: Construction Materials: PO43.5R OPC (Dalian Xiaoyetian Cement Co., Ltd.) River Sand(Fineness Modulus=2.9) Grade I fly ash Polycarboxylic acid superplasticizer( powder) The light transmission rate of resin transparent concrete is 80% more than transparent concRead more

    Mechanism of resin transparent concrete:

    Construction Materials:

    • PO43.5R OPC (Dalian Xiaoyetian Cement Co., Ltd.)
    • River Sand(Fineness Modulus=2.9)
    • Grade I fly ash
    • Polycarboxylic acid superplasticizer( powder)

    The light transmission rate of resin transparent concrete is 80% more than transparent concrete using Plastic Optical Fibres.


    The number of resins is inserted within the concrete to transmit light from it’s one face to another.

    The casting process of resin transparent concrete is the same as that of our conventional concrete but we have to produce a special type of molds that has holes of appropriate spacing.


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Asked: September 12, 2020In: Concrete

What are the major differences between IS 10262: 2009 & IS 10262: 2019 in concrete mix design?

Komal Bhandakkar
Komal Bhandakkar

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What are the major differences between IS 10262: 2009 & IS 10262: 2019 in concrete mix design?

  1. aviratdhodare

    aviratdhodare

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    Added an answer on September 16, 2020 at 3:40 pm

    IS 10262: 2009 and IS: 10262: 2019 in concrete mix design: This IS provides guidelines for proportioning concrete mixes as per requirements using the concrete materials and the supplementary materials. IS 10262: 2019 is the second revision of the first edition IS 10262: 2009 in concrete mix design iRead more

    IS 10262: 2009 and IS: 10262: 2019 in concrete mix design:

    This IS provides guidelines for proportioning concrete mixes as per requirements using the concrete materials and the supplementary materials. IS 10262: 2019 is the second revision of the first edition IS 10262: 2009 in concrete mix design in which the following major changes have been made(As per the description of the code):

    • The standard was divided into five sections as General, Ordinary and standard grades of concrete, high strength grades of concrete, Self-compacting concrete and Mass concrete.
    • A new section for Mix proportioning procedure for High strength concrete for M65 and above(up to target strength of M 100) was included.
    • The formula for the target mean strength for mix proportioning for refined by including a new factor based on the grade of the concrete. It was done to ensure a min margin been the characteristic compressive strength and the target mean strength.
    • A graph of W/C vs. 28 days strength of concrete introduced for different grades and types of cements for an alternative to initial water-cement ratio assumption.
    • In the design of normal concrete mix proportion, the consideration of air content was reintroduced.
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Asked: September 22, 2020In: Concrete

What is the use of plastic optical fibre in concrete?

Komal Bhandakkar
Komal Bhandakkar

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What is the use of plastic optical fibre in concrete?

  1. nikeetasharma

    nikeetasharma

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    Added an answer on November 29, 2020 at 3:28 pm

    The experimental results show that an optical fiber can be easily combined with concrete and that the POF could provide a steady light transmitting ratio. Moreover, the FBG can be used as a sensing element for strain and temperature.

    The experimental results show that an optical fiber can be easily combined with concrete and that the POF could provide a steady light transmitting ratio. Moreover, the FBG can be used as a sensing element for strain and temperature.

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Asked: September 8, 2020In: Concrete

What are various functions of retarders in Concrete? What is meant by accelerator?

Komal Bhandakkar
Komal Bhandakkar

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Accelerator means what ? Retarder means what ? Why gypsum is used in cement ?

  1. Komal Bhandakkar

    Komal Bhandakkar

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    Added an answer on November 17, 2020 at 5:45 pm
    This answer was edited.

    Gypsum: It acts as a retarding agent in cement, which prevents the flash setting of cement. It has another advantage that it is fire resistant also. It also influences the strength, strength development, and volume stability of cement. It simply means that the addition of gypsum in cement not only iRead more

    Gypsum:

    • It acts as a retarding agent in cement, which prevents the flash setting of cement.

    • It has another advantage that it is fire resistant also.

    • It also influences the strength, strength development, and volume stability of cement. It simply means that the addition of gypsum in cement not only influences its setting time property but other properties as well.

    Thank You.

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Asked: September 23, 2020In: Concrete

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

Komal Bhandakkar
Komal Bhandakkar

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

  1. Komal Bhandakkar

    Komal Bhandakkar

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    Added an answer on September 28, 2020 at 11:25 pm
    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: September 22, 2020In: Concrete

How to check the purity of cement?

Komal Bhandakkar
Komal Bhandakkar

Komal Bhandakkar

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How to check the purity of cement?

  1. nikeetasharma

    nikeetasharma

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    Added an answer on November 24, 2020 at 12:32 pm

    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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