Civil Lab Equipment
Rapid Moisture Meter test
₹ 1,850/ PieceGet Latest Price
Brand | Harjai And Company |
Usage/Application | Industrial |
Automation Grade | Manual |
Material | MS |
Packaging Type | Carton Box |
Country of Origin | Made in India |
HARJAI RAPID MOISTURE METER Determining Water Content In Soil – Calcium Carbide MethodThis test is done to determine the water content in soil by calcium carbide method as per IS: 2720 (Part II) – 1973. It is a method for rapid determination of water content from the gas pressure developed by the reaction of calcium carbide with the free water of the soil. From the calibrated scale of the pressure gauge the percentage of water on total mass of wet soil is obtained and the same is converted to water content on dry mass of soil.Apparatus required :-i) Metallic pressure vessel, with a clamp for sealing the cup, alongwith a gauge calibrated in percentage water contentii) Counterpoised balance, for weighing the sampleiii) Scoop, for measuring the absorbent (Calcium Carbide)iv) Steel balls – 3 steel balls of about 12.5mm dia. and 1 steel ball of 25mm dia.v) One bottle of the absorbent (Calcium Carbide)PREPARATION OF SAMPLESand – No special preparation. Coarse powders may be ground and pulverized. Cohesive and plastic soil – Soil is tested with addition of steel ball in the pressure vessels. The test requires about 6g of sample.Procedure to determine Water Content In Soil By Calcium Carbide Method i) Set up the balance, place the sample in the pan till the mark on the balance arm matches with the index mark.ii) Check that the cup and the body are clean.iii) Hold the body horizontally and gently deposit the levelled, scoop-full of the absorbent (Calcium Carbide) inside the chamber.iv) Transfer the weighed soil from the pan to the cup.v) Hold cup and chamber horizontally, bringing them together without disturbing the sample and the absorbent.vi) Clamp the cup tightly into place. If the sample is bulky, reverse the above placement, that is, put the sample in the chamber and the absorbent in the cup.vii) In case of clayey soils, place all the 4 steel balls (3 smaller and 1 bigger) in the body along with the absorbent.viii) Shake the unit up and down vigorously in this position for about 15 seconds.ix) Hold the unit horizontally, rotating it for 10 seconds, so that the balls roll around the inner circumference of the body.x) Rest for 20 seconds.xi) Repeat the above cycle until the pressure gauge reading is constant and note the reading. Usually it takes 4 to 8 minutes to achieve constant reading. This is the water content (m) obtained on wet mass basis.xii) Finally, release the pressure slowly by opening the clamp screw and taking the cup out, empty the contents and clean the instrument with a brush.REPORTING OF RESULTSThe water content on dry mass basis,w=m/[100-m] * 100%
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Harjai Rapid Moisture Meter
₹ 1,850/ PieceGet Latest Price
Usage/Application | Industrial |
Brand | Harjai And Company |
Warranty | 1 Year |
Accuracy | +-1% |
Material | MS |
Country of Origin | Made in India |
Water Content Of Soil By Calcium Carbide Method
Water Content of soil is the quantity of soil contained in a sample of soil. Generally this is expressed in ratio.
Here : s-soil (dry), v-void (pores filled with water or air), w-water, a-air. V is volume, M is mass.
Volumetric Water Content is defined by
where Vw is the volume of water and VT = Vs + Vv = Vs + Vw + Va is the total volume (that is soil volume + water volume + air space).
Gravimetric water content is expressed by mass (weight) as follows:
where mw is the mass of water and mt is the bulk mass. The bulk mass is taken as the total mass, except for geotechnical and soil science applications where oven-dried soil (ms, see the diagram) is conventionally used as mt
We can determine the water content in soil by calcium carbide method as per IS: 2720 (Part II) - 1973.
PRINCIPLE
It is a method for rapid determination of water content from the gas pressure developed by the reaction of calcium carbide with the free water of the soil. From the calibrated scale of the pressure gauge the percentage of water on total mass of wet soil is obtained and the same is converted to water content on dry mass of soil.
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Aggregate Impact Value Test Apparatus
₹ 1,850/ PieceGet Latest Price
Thickness | 5mm |
Material | MS |
Brand | Harjai And Company |
Automation Grade | Manual |
Country of Origin | Made in India |
“HARJAI” AGGREGATE IMPACT TEST APPARATUS WITH COUNTER
With Respect to concrete aggregates,toughness is usually considered the resistance of the material to failure by impact.Several attempts to develop a method of test for aggregates impact value have been made.The most successful and known test is described below..
APPARATUS
i) Impact testing machine conforming to IS: 2386 (Part IV) - 1963
ii) IS Sieves of sizes - 12.5mm, 10mm and 2.36mm
iii) A cylindrical metal measure of 75mm dia. and 50mm depth
iv) A tamping rod of 10mm circular cross section and 230mm length, rounded at one end
v) Oven
PREPARATION OF SAMPLE
i) The test sample should conform to the following grading:
- Passing through 12.5mm IS Sieve 100%
- Retention on 10mm IS Sieve 100%
ii) The sample should be oven-dried for 4hrs. at a temperature of 100 to 110oC and cooled.
iii) The measure should be about one-third full with the prepared aggregates and tamped with 25 strokes of the tamping rod.A further similar quantity of aggregates should be added and a further tamping of 25 strokes given. The measure should finally be filled to overflow, tamped 25 times and the surplus aggregates struck off, using a tamping rod as a straight edge. The net weight of the aggregates in the measure should be determined to the nearest gram (Weight 'A').
PROCEDURE i) The cup of the impact testing machine should be fixed firmly in position on the base of the machine and the whole of the test sample placed in it and compacted by 25 strokes of the tamping rod.
ii) The hammer should be raised to 380mm above the upper surface of the aggregates in the cup and allowed to fall freely onto the aggregates. The test sample should be subjected to a total of 15 such blows, each being delivered at an interval of not less than one second.
REPORTING OF RESULTS i) The sample should be removed and sieved through a 2.36mm IS Sieve. The fraction passing through should be weighed (Weight 'B'). The fraction retained on the sieve should also be weighed (Weight 'C') and if the total weight (B+C) is less than the initial weight (A) by more than one gram, the result should be discarded and a fresh test done.
ii) The ratio of the weight of the fines formed to the total sample weight should be expressed as a percentage.
Aggregate impact value = B/A x 100%
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