Sigma Test and Research Centre : Laboratory Testing,Quality Control,Testing Services
    • Soil Testing

Chloride Content:

The effect of chloride concentration in soil on corrosion of reinforcing steel was evaluated by measuring corrosion potentials and corrosion current density.
Concrete in contact with soil bearing high levels of chloride could suffer from early ingress of this chloride, leading to corrosion of any embedded reinforcement. Measures of chloride levels in soils are often taken to check whether the soil will be suitable to be used adjacent to concrete.
Test Method: IS: 4032-1985

Electrical Resistivity:

Electrical resistivity of the soil can be considered as a proxy for the spatial and temporal variability of many other soil physical properties (i.e. structure, water content, or fluid composition). Because the method is non-destructive and very sensitive, it offers a very attractive tool for describing the subsurface properties without digging.
Test Method: IS: 15736-2007

Linear Shrinkage:

This test is used to measure the percentage decrease in dimension of a fine fraction of a soil when it is dried after having been moulded in a wet condition approximately at its liquid limit. 
Test Method: IS: 2720 (P-6) 1972

Modified Procter Compaction Test:

The Proctor compaction test is a laboratory method of experimentally determining the optimal moisture content at which a given soil type will become most dense and achieve its maximum dry density.
Test Method: IS: 2720 (P-3,7)1980

Organic Matter Content:

Organic matter is stable in the soil. It has been decomposed until it is resistant to further decomposition. Usually, only about 5 percent of it mineralizes yearly. That rate increases if temperature, oxygen, and moisture conditions become favorable for decomposition, which often occurs with excessive tillage. It is the stable organic matter that is analyzed in the soil test.
Test Method: IS: 2720 (P-22)1972

Particle Size Distribution by Sieve Analysis:

The objective of this test is to determine the relative proportions of different granular sizes as they are passing through certain sieve sizes. Thus, the percentage of sand, gravel, silt and clay can be obtained from the sieve analysis test.
The sieve analysis (grain size analysis) is widely used in classification of soils. The data obtained from grain size distribution curves is used in the design of filters for earth dams and to determine suitability of soil for road/highway construction, embankment fill of dam, airport runway/taxiway, etc.
Test Method: IS: 2720 (P-4)1985

Particle Size Distribution by Hydrometer:

Hydrometer testis the procedure generally adopted for determining the particle-size distribution in the soil for the fraction for that is finer than sieve size 0.075 mm. The lower limit of the particle size determined by this procedure is about 0.001 mm.
Test Method:

Plasticity Index:

The Plasticity Index is simply the numerical difference between the liquid limit and the plastic limit for a particular material and indicates the magnitude of the range of moisture content over which the soil remains plastic.  It is a measure of the cohesive qualities of the binder resulting from the clay content.  Also, it gives some indication of the amount of swelling and shrinkage that will result in the wetting and drying of that fraction tested. 
Test Method: IS: 2720 (P-5)1985

Sulphate Content:

This method determines the soluble sulfate content of soil by using turbidimetric techniques.  The results are used to determine whether chemical stabilization (with lime, fly ash, cement kiln dust, etc.) of the tested soil is appropriate.
Test Method: IS: 2720 (P-27)1977

SOIL TESTING-CONTAMINATION:

As the requirement for land for housing, retail, office and industrial development continues to grow, there is a real need for developers to use sites previously used for industrial purposes (Brownfield sites). These sites may not have been subject to the rigorous environmental legislation that applies today, resulting in the possibility of various levels of contamination. It is necessary, therefore, to conduct a contaminated land survey for these types of site.

 
  • Desktop study including previous uses
  • Visual inspection of the site
  • Assessing the site's geology and hydrology
  • Carrying out sampling in accordance with methods agreed with the client
  • Laboratory analysis of the samples.

SOIL GEO TECHNICAL INVESTIGATION

Load Bearing Capacity: This test helps in determining the maximum load the soil can withstand.
Test Method: Shear Strength: This test helps in determining the magnitude of the shear stress that a soil can sustain. The shear resistance of soil is a result of friction and interlocking of particles, and possibly cementation or bonding at particle contacts.
Test Method: ASTM D3080

Dynamic Core Penetration Test: This test helps in determining the compactness of the sub soil layer without making a bore hole. The data obtained by the test provides a continuous record of soil resistance. This is an in-situ dynamic penetration test designed to provide information on the geotechnical engineering properties of soil.
Test Method: BS EN ISO 22476-3 / ASTM D1586 / AS 1289.6.3.1

Triaxial Compression Test: This test helps in determining the shear testing of soils.
Test Method: ASTM D4767 - 11 / D2850

Plate Bearing: In the design of shallow foundation or traffic surface, design engineers need to know the bearing capacity of soil underneath. Plate bearing test is carried out in the field to serve this purpose. Results from the test can be used as design parameter or used to confirm the design assumption.
Test Method: BS 1377 Part 9: 1990 Standards.