Thursday, December 15, 2016

Proctor test (Moisture Density Relationship of Soil) AASHTO T 180-74


Moisture-Density Relations of Soils Using a 4.54 kg (10 lb) Rammer and a 457 mm (18 in.) Drop (
AASHTO T 180-74)

            This method of test is intended for determining the relationship between moisture content and dry density of soils when compacted according to the described procedures and equipment. For a given compactive effort, a 4.54 kg hammer dropped 457.2 mm, 56 blows per layer, each soil has a moisture content at which the dry density reaches a maximum value.
2. Apparatus 
Mold Dimensions:
    Volume: 2124 ± 21 cm3 (1/ 13.3 3 ± 0.00075 ft3 )
    Inside Diameter: 152.4 ± 0.6604 mm (6.000 ± 0.026 in.)
     Height: 116.43 ± 0.127 mm (4.584 ± 0.005 in.)
2. Rammer
    Manually Operated-Metal rammer having a flat circular face of 50.8 ± 0.127 mm (2.000 ± 0.005 in.) diameter, a wear tolerance of 0. 13 mm (0.005 in.) and a mass of 4.5359 ± 0.0081 kg (10.00 ± 0.2 lb)
3. Balances
    Balances and Scales-A balance or scale of at least 11.5 kg (25 lb) capacity and having a sensitivity and readability to 5 g (0.01 lb). Also, a balance of at least 1 kg capacity with a sensitivity and readability of 0.1 g.
4. Drying Oven-
    A thermostatically controlled drying oven capable of maintaining a temperature of 110 ± 5 C for drying moisture samples.
5.  Straightedge
   A hardened steel straightedge at least 254 mm (10 in.) in length.

6. Sieves
   50, 19.0 and 4.75 mm (2 in., 3/4 in., and No. 4, No 40, No 10, No 40, No 200)
7. Containers
     For determination of moisture content samples

       If the soil sample is damp when received from the field, dry it until it becomes friable when troweled. Drying may be in air or by use of drying apparatus such that the temperature of the samples does not exceed 60 C. Then, thoroughly break up the aggregations in such a manner as to avoid reducing the natural size of individual particles. Sieve an adequate quantity of the representative pulverized soil over the 19.0 mm (3/4 in.) sieve. Discard the coarse material, if any, retained on the 19.0 mm (3/4 in.) sieve 
   It is advisable to maintain the same percentage of coarse material passing a 50 mm (2 in.) sieve and retained on a 4.75 mm (No. 4) sieve in the moisture density sample as in the original field sample, the material retained on the 19.0 mm (3/4 in.) sieve shall be replaced as follows: Sieve an adequate quantity of the representative pulverized soil over the 50 mm (2 in.) and 19.0 mm (3/4 in.) sieves. Discard the coarse material retained on the 50 mm (2 in.) sieve. Remove the material passing the 50 mm (2 in.) sieve and retained on the 19.0 mm (1/4 in.) sieve and replace it with an equal mass of material passing the 19.0 mm (3/4 in.) sieve and retained on the 4.75 mm (No. 4) sieve. 
      Take the material for replacement from the remaining portion of the sample. 3.3 Select a representative sample, weighing approximately 11 kg (or 25 lb) or more

   Thoroughly mix the selected representative sample with sufficient water to dampen it to approximately four percentage points below optimum moisture content.
      Form a specimen by compacting the prepared soil in the 152 mm (or 6 in.) mold (with collar attached) in five approximately equal layers to give a total compacted depth of about 127 mm (5 in.). Compact each layer by 56 uniformly distributed blows from a rammer dropping free from a height of 457.2 mm (18 in.) above the elevation of the soil when a sleeve-type rammer is used, or from a height of 457.2 mm (18 in.) above the approximate elevation of each finally compacted layer when a stationary mounted type of rammer is used. During compaction, the mold shall rest firmly on a dense, uniform, rigid and stable foundation. A block of concrete weighing not less than 90 kg (or 200 lb) and supported by a relatively stable foundation or a sound concrete floor have been found to be satisfactory
      Following compaction, remove the extension collar, carefully trim the compacted soil even with the top of the mold by means of the straightedge, remove mold from base and weigh the mold and moist soil to the nearest 5 g (0.01 lb).

     Remove the material from the mold and slice vertically through the center. Take a representative sample of the material from one of the cut faces, weigh immediately, and dry in an oven at 110 ± 5 C for at least 12 h or to constant mass, to determine the moisture content. The moisture content sample shall weigh not less than 500 g.

    Thoroughly break up the remainder of the material until it will pass a 19.0 mm (3/4 in.) sieve and 90 percent of the soil aggregations will pass a 4.75 mm (No. 4) sieve as judged by eye, and add to the remaining portion of the sample being tested. Add water in sufficient amounts to increase the moisture content of the soil sample by one or two percentage points, and repeat the above procedure for each increment of water added. Continue this series of determinations until there is either a decrease or no change in the wet unit mass, W1, per cm 3 (or ft3 ) of the compacted soil

      Calculate the moisture content, w and the dry mass of soil, W as compacted for each trial as follows
w = percentage of moisture in the specimen, 
A = mass of the container and wet soil, g, (or lbs), 
B = mass of the container and dry soil, g, (or lbs), 
C = mass of the container, g, (or lbs) 
W=dry density, g/cm3 (or pcf) of compacted soil, and 
W1=wet density, g/cm3 (or pcf) of compacted soil.


                    You can Download Excel Sheet of Proctor for your Daily submission of Test to your consultant. In this every formula is present only you have to put Required data automatically Graph will Form. 




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