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nikeetasharma
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What is the purpose of doing CBR Test?

  1. Komal Bhandakkar

    Komal Bhandakkar

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    What is the purpose of doing CBR Test?

    Purpose of California bearing ratio test: The main purpose of the California bearing ratio test is the measurement of a soil resistance penetration before reaching its highest ultimate value of a shearing Basically, 2 California bearing ratio value is designed as a ratio in % of range 0 to 100. TheRead more

    Purpose of California bearing ratio test:

    1. The main purpose of the California bearing ratio test is the measurement of a soil resistance penetration before reaching its highest ultimate value of a shearing
    2. Basically, 2 California bearing ratio value is designed as a ratio in % of range 0 to 100.
    3. The important operation of conducting the California bearing ratio test are same of variations of various soil conditions and various type of construction.
    4. California bearing ratio test is used for the evaluation of subgrade strength of road and pavement
    5. California bearing ratio value used as an index of soil strength and its bearing capacity
    6. The results obtained from the CBR test are used with the Imperial curves for the determination of the thickness of pavement and various component layers of pavement.

     

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Charan Deep
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What is the Type of penstock and nozzle used for Pelton turbine model 

  1. AdityaBhandakkar

    AdityaBhandakkar

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    What is the type of Nozzle used for pelton wheel model

    Hi, During selecting a penstock, it's a crucial choice of the pipe diameter and the pressure permissible with the material. the material should be selected according to the pressure and the condition of the run also with local circumstances. HDPE- high-density polyethene pipes are a popular choice aRead more

    Hi,

    During selecting a penstock, it’s a crucial choice of the pipe diameter and the pressure permissible with the material. the material should be selected according to the pressure and the condition of the run also with local circumstances. HDPE- high-density polyethene pipes are a popular choice as a material for penstock. By using this material determine gives efficiency by up to 70%.

    Nozzles must be designed in a way that the laws of pressure are as much as small as possible so that the coefficient of nozzle increases. To avoid the friction nozzle should be constructed with a possible largest radius.

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Shivan
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How to conduct a soundness tests on cement?

  1. Nimesh Gajera

    Nimesh Gajera

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    The cement considers unsound if it undergoes a large change in volume (expansion) that causes cracking of hardened cement paste when it is under the condition of restraint. Apparatus Required: Le-Chateliers Apparatus, Water bath, Vernier Caliper, Weighing Scale. Procedure : 1. Place the lightly oileRead more

    The cement considers unsound if it undergoes a large change in volume (expansion) that causes cracking of hardened cement paste when it is under the condition of restraint.

    Apparatus Required: Le-Chateliers Apparatus, Water bath, Vernier Caliper, Weighing Scale.

    Procedure :

    1. Place the lightly oiled mold on a lightly oiled glass sheet and fill it with cement paste formed by gauging cement with 0.78 times the water required to give a paste of standard consistency.

    2. Cover the mold with another piece of lightly oiled glass sheet, place a small weight on this covering glass sheet and immediately submerge the whole assembly in water at a temperature of 27 ± 2°C and keep there for 24 hours.

    3. Measure the distance separating the indicator points to the nearest 0.5 mm. Submerge the mold again in water at the temperature prescribed above.

    4. Bring the water to boiling, with the mold kept submerged, in 25 to 30 minutes, and keep it boiling for three hours. Remove the mold from the water, allow it to cool, and measure the distance between the indicator points.

    5. The difference between these two measurements indicates the expansion of the cement. This must not exceed 10 mm for ordinary, rapid hardening, and low heat Portland cements. If in case the expansion is more than 10 mm as tested above, the cement is said to be unsound.

    Observation And Recording:

    Soundness/expansion of cement = L1-L2
    L1=Measurement taken after 24 hours of immersion in water at a temp. of 27 ± 20C
    L2=Measurement taken after 3 hours of immersion in water at boiling temperature.
    Calculate the mean of two values to the nearest 0.5 mm.

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Will Williams
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What is Kelly ball test for workability of concrete?

  1. Vivek Patel

    Vivek Patel

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    Kelly ball test is simply a test used for measuring the workability of concrete. Test apparatus look like The Kelly ball test was formally standardized in ASTM C360-92: the name is “Standard Test Method for Ball Penetration in Freshly Mixed Hydraulic Cement Concrete.”   Advantages: The test isRead more

    Kelly ball test is simply a test used for measuring the workability of concrete.

    Test apparatus look like

    The Kelly ball test was formally standardized in ASTM C360-92: the name is “Standard Test Method for Ball Penetration in Freshly Mixed Hydraulic Cement Concrete.”

     

    Advantages:

    • The test is faster than the slump test.

    I has been claimed that the Kelly ball test provides more accurate results than the slump
    test.

    Disadvantages:

    • Like the slump test, the Kelly ball test is a static test.
    • The test must be performed on a level surface of concrete
    • Largea aggregate can influence the results of kelly ball.
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Akashsharma2
Akashsharma2

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Is there any gradation limit for 6mm aggregate.

  1. Gopal Mishra

    Gopal Mishra

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    you can refer to this article https://test.theconstructor.org/practical-guide/grading-limits-for-aggregates/2383/

    you can refer to this article https://test.theconstructor.org/practical-guide/grading-limits-for-aggregates/2383/

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Jinny Healthy Girl
Jinny Healthy Girl

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How to determine the specific gravity of chemicals using Pycnometer? Can the pycnometer test for specific gravity done without a Vaccum pump?  

  1. Rohan Chaugule

    Rohan Chaugule

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    Steps PROCEDURE Clean and dry the density bottle wash the bottle with water and allow it to drain. Wash it with alcohol and drain it to remove water.  Wash it with ether, to remove alcohol and drain ether. Weigh the empty bottle with stopper (W1) Take about 10 to 20 gm of oven soil sample which is cRead more

    Steps

    PROCEDURE

    1. Clean and dry the density bottle
    1. wash the bottle with water and allow it to drain.
    2. Wash it with alcohol and drain it to remove water.
    3.  Wash it with ether, to remove alcohol and drain ether.
    1. Weigh the empty bottle with stopper (W1)
    2. Take about 10 to 20 gm of oven soil sample which is cooled in a desiccator. Transfer it to the bottle. Find the weight of the bottle and soil (W2).
    3. Put 10ml of distilled water in the bottle to allow the soil to soak completely. Leave it for about 2 hours.
    4. Again fill the bottle completely with distilled water put the stopper and keep the bottle

        under constant temperature water baths (Tx0 ).

    1. Take the bottle outside and wipe it clean and dry note. Now determine the weight of the bottle and the contents(W3).
    2. Now empty the bottle and thoroughly clean it. Fill the bottle with only disttiled water and weigh it. Let it be W4at temperature (Tx0C).
    3. Repeat the same process for 2 to 3 times, to take the average reading of it.

      OBSERVATIONS

    S. No. Observation Number 1 2 3
    1

    2

     

    3

     

    4

    		 Weight of density bottle (W1 g)

    Weight of density bottle + dry soil (W2 g)

    Weight of bottle + dry soil + water at temperature T x0 C (W3 g)

    Weight of bottle + water (W4 g) at temperature Tx0 C

    		      
      Specific gravity G at  Tx0 C      
      Average specific gravity at Tx0C      

    INTERPRETATION AND REPORTING

      Unless or otherwise specified specific gravity values reported shall be based on water at 270C. So the specific gravity at 270C = K�Sp. gravity at Tx0C.

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