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Asked: June 9, 2020In: Concrete

What is the difference between Reinforced cement concrete and Fibre Reinforced Concrete?

Tanveer Habib
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What is the difference between Reinforced cement concrete and Fibre Reinforced Concrete?  

  1. Kuldeep Singh

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    Added an answer on July 5, 2020 at 5:26 pm

    Reinforced concrete is the kind of concrete you'll normally see. It's reinforced with steel rebars to compensate for the low tensile strength of plain concrete. Fiber reinforced concrete is one in which the steel rebars are replaced with fibrous material pre added into the concrete mix so as to haveRead more

    Reinforced concrete is the kind of concrete you’ll normally see. It’s reinforced with steel rebars to compensate for the low tensile strength of plain concrete.

    Fiber reinforced concrete is one in which the steel rebars are replaced with fibrous material pre added into the concrete mix so as to have this fibrous material embedded as reinforcement in the finished concrete. The fibres used vary from steel, plastic, synthetics, polymers, natural fibres and some more.

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Asked: January 5, 2019In: Concrete

Rate analysis concrete block of size 30cm*20cm*15cm of ratio 1:2:4

krishna
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Rate analysis for block size 30cmx20cmx15cm with mortar ratio of 1:2:4 including labour cost

  1. Komal Bhandakkar

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    Added an answer on October 6, 2020 at 5:20 pm
    This answer was edited.

    Rate analysis: Rate analysis will simply the quantity of cement and sand required for the 1-meter cube of cement sand mortar. Similarly, we can do rate analysis for concrete as well for different proportions. Here I am discussing point example of the material required for the 1-meter cube of cementRead more

    Rate analysis:

    Rate analysis will simply the quantity of cement and sand required for the 1-meter cube of cement sand mortar.

    Similarly, we can do rate analysis for concrete as well for different proportions.

    Here I am discussing point example of the material required for the 1-meter cube of cement concrete of density 2.3 ton per metre cube and cement sand aggregate ratio is 1:3: 6

    Mix proportion ratio is 1:3:6 (here, maximum 20 nominal sizes of aggregates are used.)

    The total sum is 1+ 3 + 6=10 Dry volume of 1-metre cube concrete is a 1.54-metre cube.

    Hence cement required is a one-tenth part of the 1.54-meter cube which is 0.15-metre cube means to 16 kg means 4.3 bags of 50 kg each.

    If you want to find out the sand quantity then it’s 0.46-meter cube means 1.2-ton Aggregate quantity 0.92-metre cube means 1.56 ton of maximum normal size of 20 mm aggregate


    I hope so your doubt is clear, thank you.

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Asked: May 10, 2021In: Concrete

What is the fineness range of cement?

Mohd .Danish
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What is the fineness range of cement?

  1. Fasi Ur Rahman

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    Added an answer on May 10, 2021 at 10:57 pm

    As per Indian Standard, the cement particle more than 10% shall not retain on the sieve (90 µm). The detailed test to determine the fineness of cement is given in the article linked below- Fineness Modulus of Cement by Dry Sieving

    As per Indian Standard, the cement particle more than 10% shall not retain on the sieve (90 µm).

    The detailed test to determine the fineness of cement is given in the article linked below-
    Fineness Modulus of Cement by Dry Sieving

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Asked: September 19, 2020In: Concrete

Photocatalytic Concrete Admixture?

Justin R
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I am looking for expert advice with regard to the use of photocatalytic concrete and the admixture TiO2.  I have never used this material, my design/build team has never used it, and most tilt-up subs that we speak with laugh ...

  1. AdityaBhandakkar

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    Added an answer on September 24, 2020 at 9:39 pm

    Hi Justin R. I am researcher  in field of Nanotechnology, so I am a eligible person for answering your question. The photocatalytic activity is tested in air purification after NOx removal. Also the self cleaning properties are tested during dye removal. TiO2 effects the hydrated Cement: It is a staRead more

    Hi Justin R.

    I am researcher  in field of Nanotechnology, so I am a eligible person for answering your question.

    The photocatalytic activity is tested in air purification after NOx removal. Also the self cleaning properties are tested during dye removal.

    TiO2 effects the hydrated Cement: It is a stable , during hydrated process.

    TiO2 makes C-S-H bond more compact , which increase the compressive strength.

     

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Asked: December 6, 2017In: Concrete

What type of plastic and its thickness is used for curing concrete?

Gopal Mishra
Gopal Mishra

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We are experiencing a drought at the moment.  The use of water is limited and therefore effecting the curing of concrete.  We want to make more use of plastic to limit the evaporation of water as long as possible.  What ...

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Asked: April 2, 2020In: Concrete

What Will be Change in Concrete Strength after 2 Years?

Lisa Price
Lisa Price

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I would appreciate some expert advice regarding a commercial concrete driveway we had installed about 30 months ago. It meant to be 32MPa (although we suspect it was not) – what results would we expect from core testing IF the ...

  1. AdityaBhandakkar

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    Added an answer on October 19, 2020 at 8:07 am
    This answer was edited.
    What Will be Change in Concrete Strength after 2 Years?

    Hi, Refer to the chart between compressive strength in MPa Vs age of concrete pavement. Generally, the standard grade of concrete will gain a 16% strength on the first day, Remaining 40% in after 3 days and 90% after 14 days, and almost 90% after 28 days. And with an increase in time the rate of hydRead more

    Hi,

    Refer to the chart between compressive strength in MPa Vs age of concrete pavement.

    Generally, the standard grade of concrete will gain a 16% strength on the first day, Remaining 40% in after 3 days and 90% after 14 days, and almost 90% after 28 days. And with an increase in time the rate of hydration decrease decreases which increases the strength with time Show us the strength of concrete pavement increases after 2 years.

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Asked: July 23, 2020In: Concrete

What is the reason for micro cracks in concrete?

Tips_and_tricks
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What is the reason for micro-cracks in concrete? Why do they occur even before the structure is loaded?

  1. CB Sowmya

    CB Sowmya

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    Added an answer on July 24, 2020 at 5:42 pm

    The reason why micro-cracks occur in concrete even before loading is because of the Interfacial Transition Zone. The interfacial transition zone is the weakest link in the concrete. It is caused by the formation of a water film around the aggregate surface. When concrete is mixed, the water forms aRead more

    The reason why micro-cracks occur in concrete even before loading is because of the Interfacial Transition Zone.

    The interfacial transition zone is the weakest link in the concrete. It is caused by the formation of a water film around the aggregate surface. When concrete is mixed, the water forms a film around the aggregate, and as a result, the water-cement ratio near that aggregate increases. A high water-cement ratio means less strength.

    This water film hinders the hydration reaction and results in a porous network of hydrated products. This porous network is much weaker than the bulk mortar. Therefore, even small changes in temperature cause differential movement of the material in the concrete. Differential movement occurs due to the difference in the porosity of the hydrated products.

    As a result, the micro-cracks are formed. They are formed even without the application of loads.

    Thanks

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Asked: July 2, 2020In: Concrete

What are the Main causes of Concrete Deterioration?

Mangala Karunarathne
Mangala Karunarathne

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What are the Main causes of Concrete Deterioration?

  1. nikeetasharma

    nikeetasharma

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    Added an answer on December 21, 2020 at 12:46 pm

    Concrete degradation may have various causes and reasons. It can be damaged by factors like fire, alkali - aggregate reaction expansion, sea water effects, bacterial corrosion, calcium leaching, physical and chemical damage from carbonation, corrosion of reinforcements and many others.

    Concrete degradation may have various causes and reasons. It can be damaged by factors like fire, alkali – aggregate reaction expansion, sea water effects, bacterial corrosion, calcium leaching, physical and chemical damage from carbonation, corrosion of reinforcements and many others.

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