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Vishwajeet Kumar - Answers

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  1. Asked: June 20, 2020In: Miscellaneous

    Is Theopectic, Bingham plastic, and Thixotropic should be categorized into the fluid?

    Vishwajeet Kumar

    Vishwajeet Kumar

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    Vishwajeet Kumar Learner
    Added an answer on July 6, 2020 at 11:11 am

    As correctly stated that Fluid is defined as a substance which continuously deforms under applied shear force. Even though only after exceeding a certain shear stress value rheopectic, thixotropic, and Bingham plastic start undergoing shear deformation, it is to note that after that stress value, thRead more

    As correctly stated that Fluid is defined as a substance which continuously deforms under applied shear force. Even though only after exceeding a certain shear stress value rheopectic, thixotropic, and Bingham plastic start undergoing shear deformation, it is to note that after that stress value, these substances also deform continuously until the external shear force is removed. Hence, they can be categorized as fluids.

    However, in case of solids under any amount of shear force, they undergo a fixed deformation and do not undergo continuous deformation.

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  2. Asked: June 18, 2020In: Construction

    Explain the effect of the construction of Weir or Barrage on the regime of the river?

    Vishwajeet Kumar

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    Vishwajeet Kumar Learner
    Added an answer on June 22, 2020 at 4:44 pm

    Normally weirs and barrages are constructed to enable a continuous supply of water into an off taking canal. We will understand the effect on the regime of river in two parts: As soon as the obstruction is created in the form of weirs and barrages, the velocity of flow reduces, slope of water flatteRead more

    Normally weirs and barrages are constructed to enable a continuous supply of water into an off taking canal. We will understand the effect on the regime of river in two parts:

    1. As soon as the obstruction is created in the form of weirs and barrages, the velocity of flow reduces, slope of water flattens up to some distance behind the obstruction, resulting in ponding of water in the upstream side and creating an afflux.

    Since the velocity of flow reduces upstream, silt carrying capacity reduces and leads to deposition of silt on river bed creating shoals and islands.

    The water travels downstream with increased velocity of flow with high demand for silt carrying capacity which is met by erosion on the downstream bed of river causing lowering of bed in downstream side also known as retrogression.

    1. The above process continues for a number of years until river in upstream starts regaining its original slope by extending the afflux further upstream of river. After regaining of slope, a stage is reached when the upstream side of obstruction will not absorb further silt. The sediment goes downstream with more sediment than the silt carrying capacity of downstream side of flow. Hence, deposition of sediment takes place in the downstream side and consequently reclamation of the original bed levels.
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  3. Asked: June 6, 2020In: Concrete

    What are the Application for Accelerating Admixture in Concrete??

    Vishwajeet Kumar

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    Added an answer on June 8, 2020 at 12:46 am

    First of all let us understand what an accelerator is. An accelerator is a chemical admixture which increases the rate of hydration of concrete; which results in rapid gain of strength in concrete. Some of the examples of accelerators are- Calcium chloride, Flourosilicates, silicates, tri-ethanol amRead more

    First of all let us understand what an accelerator is. An accelerator is a chemical admixture which increases the rate of hydration of concrete; which results in rapid gain of strength in concrete. Some of the examples of accelerators are- Calcium chloride, Flourosilicates, silicates, tri-ethanol amine etc. The mechanism it follows is that the admixture combines with C3A and form hydrocomplex compounds which activates C3A and increases the rate of hydration.

    Applications of accelerating admixture:

    1. Cold weather concreting– In cold climatic regions, for example in countries like Russia, Serbia etc, temperatures are very low and close to or even less than zero. Since hydration is a chemical reaction, the rate of the reaction significantly reduces with the fall of temperature; it will take a long time for the concrete to harden. This slow rate of hardening (i.e. gain of strength) results in higher stripping time of formwork and hence prolonged construction period making the project economically non feasible. Further there is a problem of frost attack. Accelerators prove to be a good remedy for this problem and helps in increasing the rate of hydration.
    2. Rigid Pavement construction– We remember the devastating effects of Uttarakhand floods in 2013 which washed away many homes including roads. For getting help in such disasters, it requires quick resumption of road transportation. Hence, roads have to be built at a faster pace and with quick gain of strength. Accelerating admixture again proves to be useful in this scenario.
    3. Prefabricated structures– Lets take example of prefabricated structure like railway sleepers. Suppose it is provided at every 1 m spacing and 500 km railway tracks has to be built. Total no of sleepers required=500 x 103 /1= 5 lakhs sleepers. Now a manufacturer is having 1000 moulds only. If he allows 28 days strength gaining process i.e. 1000 sleepers in approx. 1 month time. Therefore time required for 5 lakh sleepers=5 x 105 /1000=500 months= almost 42 years. Usually duration of project will be max 5 years.That’s why here also accelerating admixture proves useful and reduces the production time and enables to quickly reuse the same mould again and again.
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  4. Asked: May 31, 2020In: Environmental Engineering

    How to Determine the Total Dissolved Solids (TDS) and Total Suspended Solids in the Water?

    Vishwajeet Kumar

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    Vishwajeet Kumar Learner
    Added an answer on June 6, 2020 at 4:28 pm

    Determination of Total Dissolved Solids TDS in water is due to the dissolved salts and minerals in water which are usually present in the form of ions; ex- sodium, potassium, carbonates, sulphates etc. Sometimes these dissolved solids can be toxic and also causes formation of scales in pipes and henRead more

    Determination of Total Dissolved Solids

    TDS in water is due to the dissolved salts and minerals in water which are usually present in the form of ions; ex- sodium, potassium, carbonates, sulphates etc. Sometimes these dissolved solids can be toxic and also causes formation of scales in pipes and hence determination of the same is essential.

    TDS can be determined by two methods:

    1. Gravimetric analysis: This method is a laboratory method and is time taking but results are accurate. Here, water sample is prepared by filtering water by 1.5 micron filter so as to separate suspended soilds from the water.

    Procedure-

    Step1- Take an empty beaker and note down it’s weight, say- 20 g.

    Step2- Put water sample in the beaker and take weight again, say-220 g which, means weight of water=220 g – 20 g=200 g.

    Step3- Heat the beaker to evaporate water and once all the water is evaporated take the weight of beaker along with the residue, say-21 g which means weight of residue is= 21g – 20 g=1 g.

     

    weight of residue= 1 g= 1000 mg

    weight of water=200 g

    Volume of water=200/1(density of water= 1 g/cc)

    =200 cc=200 mL=0.2 litres

    TDS=1000 mg/0.2 Litres= 5000 mg/L=5000 ppm.

    *Note- when water is evaporated, dissolved solids in the form of ions combines    to  form solid residue.

    2. TDS meter: Dissolved solids are usually present in water in the form of        ions and ions conduct electricity. This principle is utilized in finding the TDS of water. TDS meter tip is dipped inside water which measures the amount of electricity getting conducted and this electricity value is calibrated to TDS value in ppm or mg/L. This method is very quick to use and is widely popular. Results of this test are approximate because all the dissolved solids present in water are not present as ions.

    Determination of Total Suspended solids

    Total Suspended solids are determined by Gravimetric Analysis in laboratory. Since water contains both dissolved as well as suspended solids, hence for the determination it is essential to separate the two solids.

    First, water sample is filtered using 1.5 micron filter and the residual contents over filter contains suspended solids. This filter is kept inside oven at 104°C and taken out after an hour. The dried weight of filter along with dried residue is taken. After subtracting the weight of filter in this weight , the suspended solids weight is found out and by dividing the weight of suspended solids by volume of water, the Total Suspended Solids value in ppm or mg/L can arrived at.

     

     

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