Technical Product Support and Training

               One of the terms and conditions of sale is that Compacto Global Group is to provide Technical Supervision on all projects, which may include site investigation of the soil conditions, supervise the application of  COMPACTO™, and in the process train on site the clients operators in the correct application of  COMPACTO™.

> Click here to read more on COMPACTO™ STANDARD TREATMENT PROCEDURE FOR ROADS>


IMPORTANT TECHNICAL INSTRUCTIONS

 

PRE-CONSTRUCTION POINTS:

BLENDING IN-SITU MATERIALS TO MODIFY PLASTICITY INDEX. 

It may be necessary to blend in-situ material with imported material to modify the plasticity index and the fines content to achieve the suitable levels required for use with the product. For example, granular sands can be treated by the addition of clay and then have  COMPACTO™ applied in line with dosage rates. In a similar way, soils with a very high content of fines can be blended with gravel or other granular material to achieve suitable levels. Even with blending, considerable cost savings can be achieved by using  COMPACTO™ instead of total replacement of the unsuitable in-situ material.

 

PRE-CONSTRUCTION POINTS:

  • The single most important factor during construction is the moisture content at initial compaction.

  • Guard against spraying successive spray overlaps as non-uniform moisture content will occur.

  • Guard against spraying outside the area to be treated as this will result in the minimum application rate not being achieved.

  • Never allow the material to be saturated. Cease operations in the event of rain but continue when conditions are suitable. Note that  COMPACTO™ is not affected by inclement weather.

 

PREPARATION FOR TREATMENT:

 Before using COMPACTO™ as an aid to compaction in the construction of a road base or the stabilization of any other area, representative samples must be taken of the material at suitable intervals and laboratory tested to determine whether they fall within the range recommended for treatment. The maximum recommended interval would be 500 meters or where obvious changes in soil type are seen to occur.

 

STABILITY CRITERIA: 

 A standard Atterberg Test is all that is required to assess the stability of the soil to be treated by  COMPACTO™. The samples need to be tested in a soil laboratory to determine:

*  Plasticity Index      (PI)

*  Particle Size          (PS)

 

A site test will be required to establish the Optimum Moisture Content (OMC) of the material in order to establish the total quantity of water required for the dilution of COMPACTO™For treatment with  COMPACTO™ suitability criteria are:

  • PI – between  5 and 52

  • PS – between 20 and 60 percent passing 75 micron sieve.

The OMC of the material needs to be known, as does the in-situ moisture content, so that the total quantity of water required for the dilution of the product maybe calculated. A moisture content of 1% - 2% above optimum moisture content is recommended to ensure full compaction. Densities of 100% can be achieved in practice by using COMPACTO™ and prescribed compaction methods. 

 

REFERENCE ABOUT SILT + CLAY:

Soil Compaction characteristics:

             Compaction characteristics of a soil indicate the relative response of that soil to compaction effort (consolidation). Soils with good compaction characteristics can be compacted to a high degree with minimum effort. Soil material with a plasticity index close to 16 percent has the best compaction characteristics.

 

For each soil, there is an optimum moisture content that will permit the soil to be compacted to the maximum degree with the least effort and allow the compacted soil to attain its lowest permeability. Optimum moisture content for various types of soils are as follows:

 

Soil

Optimum moisture content for compaction (range in %)

Clayey sands, sand-clay mix

11 - 10

Sand-silt-clay mix with plastic, silt + clay fraction 

15 - 11

Inorganic silt, clayey silt

24 - 12

Inorganic clay

24 - 12

Organic silt

33 - 21

Inorganic clay, highly plastic

36 - 19

Organic clay

45 - 21

 

 Note: the optimum moisture content is usually 2-3 percent less than the plastic limit of the soil.

 

  SOIL TYPE  

 UCS GROUP

 COMPACTED

    TYPICAL  CBR    

          ACTUAL CBR 

    BEFORE        AFTER      

 

COMMENT

                                            

GM

20 - 60

40

12

80

40

PI  3,    PS 24

GC

20 - 40

15

25

60

80

PI 15,   PS 40

SM

10 - 40

06

45

SC

10 - 20

21

28

ML

05 - 15

11

35

CL

05 - 15

02

50

OL

04 - 08

10

08

30

70

PI  10.    PS   36

  PI   22,   PS   74  

MH

04 - 08

08

29

25

45

PI  13,    PS   63

PI   18,   PS   61

CH

03 - 05

03

08

PI   26,   PS   38

OH

03 - 05

01

09

PI   35,   PS   32

 

SOIL FIELD MANUAL:

 Coarse-grained soils:

GW - Well graded gravel

GP - Poorly graded gravel

GM - Silty gravel

GC - Clayey gravel sand

SW - Well graded sand

SP  - Poorly graded sand

SM - Silty sand

SC - Clayey sand

 

Fine-grained soils:

CL  - Lean clay

ML - Silt

OL - Organic clay (on or above A-line)

     - Organic silt (below A-line)

CH - Fat clay

MH - Elastic silt

OH - Organic clay (on or above A-line)

     - Organic silt (below A-line)