QUALITY CONTROL

 

To exercise quality control over works, apart from field staff four Research Laboratories are functioning. These laboratories are well equiped for carrying out various tests required for civil engineering purpose. These laboratories are stationed at Raipur, Bilaspur, Raigarh and Jagdalpur. One testing laboratory is also working in NH. at Raipur.

 

The setup is as follows :-

 

 

Above laboratories are controlled by higher offices viz E-in-C, Chief Engineer, Superintending Engineers of respactive places. These laboratories have well qualifies and experienced Research Staff for carrying out tests.

 

Testing facilities available in Research Laboratories

 

Type of Test

Name of Tests

Min. Frequency of Test

Test conducted at

1

2

3

4

Granular

Gradation

One test per 200 M3

Field/Laboratory

 

Atterberg Limits

One test per 200 M3

Field/Laboratory

 

Moisture Content prior to compactions

One test per 250 M2

Field

 

Density of compacted layer

One test per 500 M2

Field/Laboratory

 

Deleterious Constituents

As required

Field/Laboratory

 

C.B.R.(Including O.M.C., M.D.D.)

As required

(1 test per 500 m3 Min)

Laboratory

Water Bound Macadam

Aggregate Impact Value

One test per 200 m3 of aggregate

Field/Laboratory

 

Grading

One test per 100 m3

Field/Laboratory

 

Flakiness Index and Elongation Index

One test per 100 m3 of aggregate

Field/Laboratory

 

Atterberg limits of binding material

One test per 25 m2 of binding material

Laboratory

Bituminous construction

 

 

 

Prime coat/Tack coat

Quality of Binder

Two samples per lot.

Laboratory

 

Binder temperature for application

At regular close intervals

Field.

 

Rate of spread of binder

Two tests per day

Field

Bitumen Macadam/ OGPC/SDBC

Quality of Binder

Two samples per lot

Laboratory

 

Aggregate Impact Value

One test per 50 M3 of aggregate

Field/Laboratory

 

Flakiness Index and elongation Index of aggregate

One test per 50 M3 of aggregate

Field/Laboratory

 

Stripping Value

One test per 50 M3 of aggregate

Laboratory

 

Grading of Aggregate

Two test Per Day

Laboratory/Field

 

Water Absorption of Aggregate

Two test per day

Laboratory/Filed.

 

Binder Content

Periodic min. two test per day per plant

Laboratory/Filed.

 

Control of temperature of binder and aggregate for mixing and of the mix at the time of laying and rolling

At regular close intervals.

Field

 

Rate of Spread of  Binder

One test per 500 m2 of area.

Field

 

Density of Compacted lay

One test per 250 m2 area

Field.


 

Type of Construction

Name of Test

Frequency

Test conducted at

Building

Aggregate Impact Value of Aggregate

One test per 45 m3

Field/Laboratory

 

Grading of Aggregate

One test per 45 m3

Field/Laboratory

 

Water Absorption of bricks

One test per 45 m3

Field/Laboratory

 

Crushing of strength of bridge

One test per 1,00,000 bricks or PMT thereof.

Field/Laboratory

 

Compressive strength of C.C. Cubes

One test per 15 m3

Field/Laboratory

 

Fineness Modulus (Grading) of sand

One test per 20 m3

Field/Laboratory

 

Silt content of sand

One test per 20 m3

Field/Laboratory

 

Bulking of sand

One test per 20 m3

Field

 

Slump tests of concrete

One test per 15 m3

Field

 

Initial and final setting time of cement

One test per 15 m3

Field/Laboratory

Bridges/ Culvert

Aggregate Impact Value of Aggregate

One test per 45 m3

Field/Laboratory

 

Grading of Aggregate

One test per 45 m3

Field/Laboratory

 

Fineness Modulus (Grading of Sand)

One test per 20 m3

Field/Laboratory

 

Silt content of sand

One test per 20 m3

Field/Laboratory

 

Bulking of Sand

One test per 20 m3

Field

 

Slump test of concrete

One test per 15 m3

Field

 

Compressive strength of cement concrete cube

One test per 15 m3

Field/Laboratory

 

Initial & Final setting time of cement

One test per 15 m3

Field/Laboratory

 

 

 

 

 

 

 

 


Quality control over works in field

 

            To exercise quality control of ongoing works 5 Mobile laboratories fitted in mobile van are available. One mobile is available with Regional Research Laboratory P.W.D., Raipur, One Mobile Van with NH laboratory, P.W.D. Raipur, One Mobile Van with NH Division, Bilaspur, One Mobile Van with Research Laboratory Bilaspur and one Mobile Van with NH. Division, Jagdalpur.

 

            Mobile Vans of NH. division are fitted with (equipments like pavement core drillings machine to take out core samples of Bituminous works. mobile van of PWD , Raipur & Bilaspur willbe fitted with above core drilling machine very soon, proceeding is in progress.

 

            All Mobile Vans are also equipped to carry out various field tests like field density test, Grading, Flakiness Index, Binder content, Thickness of pavement etc.