8/14/2019 4-Q[1].C.-final

1/5

Quality Control

Introduction:

Testing the quality of building material is very necessary at the site before it is ready to be

used as a construction material. The material which is used on site suffers from manydifferent environmental conditions (moisture conditions and temperature conditions) then the

material tested in the laboratory as compared to the control conditions of laboratory. The

material available near the site for example the water has to be tested for its construction

requirements as it may affect the quality of construction. The water used must not have high

chlorine content.

Since the moisture content of sand varies continuously depending upon different weather

conditions so its moisture content has to be check regularly and necessary correction has to

be implanted and proper quantity of sand and aggregate can be used to achieve the desired

standard of strength.

Admixtures are substances used in small quantity to increase the workability of the concrete

for the given water cement ratio without affecting the strength of the concrete. Admixtures

used at the site are Sikament170PL4.

Water proofing of walls and floors are necessary to prevent them from dampness and

destruction of steel in reinforcement due to rusting and to prevent subsequent leakages and

even in worst cases failure of complete structure.

According to the material available at the site before starting of the construction proper mixdesign is done and is estimated that what moisture content will amount to what strength in

concrete and a regular check is made by testing the concrete while construction and proper

correction is made if necessary.

Fundamentals of Quality Controls:

Water proofing of walls and floors are done by layering the walls and floors by water

proofing compound DR. FIXIT PIDECRETE MPB in 1:1 ratio by cement of

thickness about 1 mm.

The steel used for construction purpose is Fe 500 TMT (Thermo-MechanicallyTreated) bars.

The grade of concrete used for construction purpose varies from M-25 to M-40 grade

concrete.

Flakiness and elongation index of aggregate should be below 35%.

Aggregate are tested for their strength by aggregate crushing and aggregate impact

test on site. Maximum size of aggregate used at site is 20 mm and minimum is 10

mm. The test are made according to IS 2386 Part (I-VIII).

8/14/2019 4-Q[1].C.-final

2/5

Cubes are casted and check for their strength by checking their 7 days and 20 days

compressive strength.

Non-destructive tests (like ultrasonic test etc.) are done on concrete if the concrete

fails to achieve the desired strength after 28 days to determine the cause of such weak

strength (due to honey-bee structure, etc.)

Admixture used is 0.6% by weight of cement.

Quality Control at Site:

Quality of the various materials utilized in the field is tested at the site itself. A separate

room for the testing of the various materials has been provided at the site office. A cube

testing machine, a hot-air oven and a sieve shaker is present in the quality control room. At

present only the cube test and the slump test are being conducted, as no other material except

for concrete is being used at the site. Though the cube test is not of much significance here, it

is being conducted at the site to assure the quality of the mix. Since the concrete is being

supplied by the company the cube test of the concrete becomes all the more significant.

Usually 6 cubes are tested when light concreting is being carried out and a minimum of 12cubes are tested when heavy concreting is being carried out. The samples of concrete are

randomly taken from the trucks that bring in the ready mix concrete. The number of cubes

that are tested depends upon the client also. The cube test is usually conducted in the

presence of the client. The slump test is conducted in the field itself. It is carried out to

determine the workability of the mix. The acceptability limits of the slump of the concrete is

slightly increased after taking into consideration the weather conditions prevalent in the

region i.e. hot and humid weather conditions. The various other tests will be conducted once

the brickwork, plastering, etc. starts. Bricks, sand, etc. will not be supplied by the client hence

the testing of these materials becomes a necessity as the usage of low of the failure will have

to be borne by the company. Quality materials may lead to failure and the whole

responsibility. The bricks will be tested using the hot-air oven. The sieve analysis will be

conducted to test the quality of the sand that is being used. The quality of cement that is being

used is determined by finding the initial setting time and the final setting time of the cement.

Tests Conducted on Soil:

Sand Replacement Method.

Core Cutter Method.

Proctor Test.

Vicats apparatus Test.

Pycnometer Test.

Test on Aggregate:

Sieve analyses.

Flakiness and elongation test.

Aggregate Impact test.

Aggregate Crushing test.

Test on Concrete:

Compressive strength test.

8/14/2019 4-Q[1].C.-final

3/5

Field Quality Control:

Sl.

No.Material

Tests to

be conducted

IS/ Job

Specification

Ref. No.

FrequencyTest conducted

By

1.Fine

Aggregate

a. Totaldeleterious

material content

IS 2386

Part IITwice per source Approved Lab

b. Silt clay

content

IS 2386

Part II

To be done every day before

start of work for 1st 7 days.

Later 1 test in every 100 m3

of sand.

Simplex Field

Lab

c. Particle size

distribution

IS 2386

Part I/ IS 383

1 testing daily for 1st 7 days.

Later 1 every 100 m3 of

sand/ change of source if any

Simplex Field

Lab

d. Moisture

content

IS 2386 PartII/ IS 456/ IS

383

1 per 100 m3

except duringmonsoon when it has to be

done every day before start

of work.

Simplex Field

Lab

8/14/2019 4-Q[1].C.-final

4/5

2.Coarse

Aggregate

a. Particle size

distribution

IS 2386I/ IS

383

1 testing daily for 1st 7 days.

Later 1 every 100 m3 of

stone aggregate/ change of

source if any

Simplex Field

Lab

b. Percentage of

soft deleterious

material

IS 2386

Part IIITwice per source

Simplex Field

Lab

c. Moisture

content

IS 2386 Part

II/ IS 456/ IS

383

1 per 100 m3 except during

monsoon when it has to be

done every day before start

of work.

Simplex Field

Lab

d. Flakiness

Index

IS 2386

Part I

Once initially and then

change with source.

Simplex Field

Lab

e. Elongation

Index

IS 2386

Part I

Once initially and then

change with source.

Simplex Field

Lab

f. Impact ValueIS 2386

Part IV

Once initially and then once

every month.

Simplex Field

Lab

g. Los Angeles

Abrasion value

IS 2386

Part IV

Once initially and then once

every month.

Simplex Field

Lab

h. SoundnessIS 2386

Part V

Once initially and then once

every month.Approved Lab

i. AlkaliAggregate

Reactivity

IS 2386

Part VII

Once initially and then onceevery month.

Simplex Fieldlab

3. Water

a. Chemical &

Physical

Properties

IS 3025

Water from each source to

be tested before start of work

and then every 6 months.

Approved Lab

b. pH value IS 456Once initially thereafter

every month.

Simplex Field

Lab

4. Cement

a. Initial & Final

setting time

IS 4031

Part V

Every 3000 bags and at least

once monthly.

Simplex Field

Lab

b. Compressive

strength

IS 4031

Part VI

Every 3000 bags and at least

once monthly.

Simplex Field

Lab

c. Chemical

Analysis

IS 4032/ IS

4031 Part II

a. Each lot

b. Once for every type of

cement

a. Manufacturer

Test Certificate

b. Approved Lab

d. Fineness &

SoundnessIS 4031 Each lot

Simplex Field

Lab

8/14/2019 4-Q[1].C.-final

5/5

5. AdmixtureAll tests as per

IS 9103IS 9103

a. Lot wise

b. Once per source

a. Manufacturer

Test Certificate

b. Approved

Lab

6. ConcreteAll tests as per

IS 516-1959IS 516-1959

1 set of 6 cubes per 28 m3 or

part thereof concrete poured

Simplex Field

Lab