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Ancy Joby
Ancy Joby

Ancy Joby

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What are the different mineral admixtures used with concrete?Also explain their effect on concrete.

  1. Preet Chovatiya

    Preet Chovatiya

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    Generally, There are 5 types of Mineral admixtures used in concrete are mentioned below: Silica fume GGBS (Ground Granulated Blast Furnace Slag) Fly ash Rice husk ash Metakaolin -The effect of GGBS, Metakaolin and Fly ash on concrete is on setting time of high strength concrete. -All the minerals caRead more

    Generally, There are 5 types of Mineral admixtures used in concrete are mentioned below:

    1. Silica fume
    2. GGBS (Ground Granulated Blast Furnace Slag)
    3. Fly ash
    4. Rice husk ash
    5. Metakaolin

    -The effect of GGBS, Metakaolin and Fly ash on concrete is on setting time of high strength concrete.

    -All the minerals can reduce bleeding in concrete.

    -The heat of hydration increased due to chemically active minerals (Metakaolin and Silica fume)

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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

    nikeetasharma

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    nikeetasharma Guru

    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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Tips_and_tricks
Tips_and_tricks

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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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    CB Sowmya User

    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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Leon
Leon

Leon

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I purchased a home and with all the recent rain I removed the basement paneling to find a leak. I discovered the home at one time had no garage. T some time the window well (see attachment) had been covered ...

  1. AdityaBhandakkar

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    Below grade window fill

    Hi, Recently I go through the image you attached, yes it possible to repair the leakages and seal with concrete with some admixtures. I suggest you contact with the locally available contractor for repairs. But if you are a civil engineer, the following are some suggestions. Following are some repaiRead more

    Hi,

    Recently I go through the image you attached, yes it possible to repair the leakages and seal with concrete with some admixtures. I suggest you contact with the locally available contractor for repairs. But if you are a civil engineer, the following are some suggestions.

    Following are some repairing methods for leakages

    1. Resin injection: used for repairing the concrete saw delaminated and also used for joints that experience water leakage. Metals are used for rebound cracks, whereas polyurethanes and acrylic acrylates are used to seal the cracks and joints that leak water.
    2. Stitching cracks: it is a long-lasting and easiest method where the holes are drilled, and the surface is stitched with the help of a metallic wire. Is metallic wires are passed through the holes and anchored strongly, and the vacant spaces are grouted.
    3. Gravity field method: in this method instrument with waterproofing admixture used to fill the cracks with the help of the gravity where it is allowed to move inside the cracks by gravity forces and sealed it. It is used for the cracks with width 0.03mm to 20mm cracks
    4. Micro toppings: Polymer with 1/8 inches, which contained a modified concrete and sand, are applied with the help of trowels. This treated surfaces can be allowed for public use within 36 to 42 hours of usages.
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Asked: In:
deayan
deayan

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Different Cement companies have maintain different % of Flyash in cement. what are the advantage and disadvantage of Higher / Lower % of flyash in cement.

  1. Komal Bhandakkar

    Komal Bhandakkar

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    This answer was edited.

    PPC: Approximately 15 to 30% of ordinary Portland cement is replaced with fly ash in Portland pozzolana cement. The compressive strength of Portland pozzolana cement is more for long term use compared to ordinary Portland cement. Ordinary Portland cement is one of the widely used cement. For residenRead more

    PPC:

    Approximately 15 to 30% of ordinary Portland cement is replaced with fly ash in Portland pozzolana cement.

    The compressive strength of Portland pozzolana cement is more for long term use compared to ordinary Portland cement.

    Ordinary Portland cement is one of the widely used cement.

    For residential construction, we prefer Portland pozzolana cement as compared to ordinary Portland cement. We use ordinary Portland cement only for commercial purposes.

    Three grades of cement are available 33, 43, and 53.

    33 grade of cement means the compressive strength of cement after 28 days of curing should be at least 33 mega Pascal not more than that value.

    43 grade of cement was the compressive strength of cement after 28 days of curing should be at least 43 Newton per mm square or more than that.

    Similarly, 53 Grade of cement means compressive strength of cement after 28 days of curing should be at least 53 Newton per mm square or more than that value.

    Thank you.

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Asked: In:
Komal Bhandakkar
Komal Bhandakkar

Komal Bhandakkar

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 what is the need to design a mix concrete ?

  1. nikeetasharma

    nikeetasharma

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    nikeetasharma Guru

    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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Gopal Mishra
Gopal Mishra

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What are the materials that can be used as replacement for fine aggregates in Concrete?

  1. sanjaypakad

    sanjaypakad

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    sanjaypakad Beginner

    It depends the nearby availability of replaceable materials as fine aggregate. Like rise husk fly ash agri waste river sand GGBS Recycled crushed aggregate Crushed stone crushed bricks

    It depends the nearby availability of replaceable materials as fine aggregate. Like

    • rise husk
    • fly ash
    • agri waste
    • river sand
    • GGBS
    • Recycled crushed aggregate
    • Crushed stone
    • crushed bricks
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