For internal circulation of BSNLonly

E4E4--E5 CIVILE5 CIVIL

(TECHNICAL)(TECHNICAL)

Mandatory Building Material Tests Mandatory Building Material Tests SessionSession-- II

WELCOME

• This is a presentation for the E4-E5 Civil Technical

Module for the Topic: Mandatory Building Material Tests

Session- I.

• Eligibility: Those who have got the Upgradation to from

E4 to E5.

• This presentation is last updated on 21-4-2011.

• You can also visit the Digital library of BSNL to see this

topic.

For internal circulation of BSNLonly

For internal circulation of BSNLonly

AGENDA

Various Mandatory Tests for Civil Works

Numbers of Tests of different Bldg. Material

Frequencies of Tests of Different Materials

Testing Results of Some Material

Water

For internal circulation of BSNLonly

Water

• Water used for mixing and curing shall be clean and

free from injurious quantities of alkalies, acids, oils,

salts, sugar, organic materials, vegetable growth or

other substance that may be deleterious to bricks,

stone, concrete or steel.

• Potable water is generally considered satisfactory

for mixing.

• The Ph value of water shall be not less than Six.

• Sea water shall not be used for mixing or curing

For internal circulation of BSNLonly

Cement

For internal circulation of BSNLonly

Sand

For internal circulation of BSNLonly

Sand & Fly Ash

For internal circulation of BSNLonly

Sand

Silt Contents

• The maximum quantity of silt in sand shall not

exceed 8%.

• Fine aggregate containing more than allowable

percentage of silt shall be washed.

Bulking of Sand

• Dampness in fine aggregate increases its volume.

• fine aggregate’s quantity shall be increase suitably

to compensate bulkage.

For internal circulation of BSNLonly

Stone Aggregate

For internal circulation of BSNLonly

Stone Aggregate

Slump Test for CC Works

• Frequency of slump test for CC Work is 15 cum on

part thereof.

• Course aggregate shall not contain any deleterious

material like pirites, coal, lignite, mika, clay, alkalie

or organic impurities.

For internal circulation of BSNLonly

Slump Tests

For internal circulation of BSNLonly

Location of CC Slump in MM

RCC Work (Nominal Mix)

For internal circulation of BSNLonly

RCC Work (Nominal Mix)

For internal circulation of BSNLonly

RCC Work (Design Mix)

For internal circulation of BSNLonly

RCC Work (Design Mix)

For internal circulation of BSNLonly

RCC Work (Steel)

For internal circulation of BSNLonly

RCC Work (Steel)

For internal circulation of BSNLonly

• Tensile Test: 0.2% proof stress and percentage

elongation –

• This shall be done as per IS 1608, read in

conjunction with IS 226.

• RE- test: This shall be done as per IS 1786.

• Re-bend test: This shall be done as per IS

1786.

RCC Work

For internal circulation of BSNLonly

Testing of Concrete

• Regular mandatory tests on the workability of

the fresh concrete shall be done to achieve the

specified compressive strength of concrete.

These will be of two types

• (a) Mandatory Lab, Test

• (b) Mandatory Field Test

• Results of Mandatory Field Test will prevail overmandatory Lab. Test.

RCC Work

For internal circulation of BSNLonly

Standard of Acceptance – for Nominal Mix

• Mandatory Lab. Test:

• Six samples of concrete cubes required for

testing of compressive strength.

• Out of six sample cubes, three cubes shall be

tested at 7 days and remaining three cubes at

28 days.

7 days’ Tests

For internal circulation of BSNLonly

• The average of the strength of three specimen

shall be accepted as the compressive strength

of the concrete provided the variation in strength

of individual specimen is not more than + 15% of

the average.

• Difference between the maximum and minimum

strength should not exceed 30% of average

strength of three specimens.

7 days’ Tests

For internal circulation of BSNLonly

• If the difference between maximum and minimum

strength exceeds 30% of the average strength, then 28

days’ test shall have to be carried out.

• If the actual average strength of sample accepted above

is equal to or higher than specified strength upto +15%

then strength of the concrete shall be considered in

order.

• In case the actual average strength of sample accepted

is lower than the specified or higher by more than 15%

then 28 days’ test shall have to be carried out to

determine the compressive strength of concrete cubes.

28 days’ Tests

For internal circulation of BSNLonly

• The average of the strength of three specimen be

accepted as the compressive strength of the concrete

provided the strength of any individual cube shall neither

be less than 70% nor higher than 130% of the specified

strength.

• If the actual average strength of accepted sample exceeds

specified strength by more than 30% the Engineer-in-

Charge, if he so desires, may further investigate the

matter. However, if the strength of any individual cube

exceeds more than 30% of specified strength, it will be

restricted to 130% only for computation of strength.

28 days’ Tests

For internal circulation of BSNLonly

• If the actual average strength of accepted sample is

equal to or higher than specified strength upto 30%

then strength of the concrete shall be considered in

order and the concrete shall be accepted at full rates.

• If the actual average strength of accepted sample is

less than specified strength but not less than 70% of

the specified strength, the concrete may be accepted

at reduced rate at the discretion of Engineer-in-

Charge

28 days’ Tests

For internal circulation of BSNLonly

• If the actual average strength of accepted sample is less

than 70% of specified strength, the Engineer-in-Charge

shall reject the defective portion of work.

• Represented by sample and nothing shall be paid for the

rejected work.

• Remedial measures necessary to retain the structure shall

be taken at the risk and cost of contractor.

• If, however the Engineer-in-Charge so desires, he may

order additional tests to be carried out to ascertain if the

structure can be retained. All the charges in connection with

these additional tests shall be borne by the contractor.

Brick Work

For internal circulation of BSNLonly

Brick Work

• Dimensional Tolerances: The dimensions of, modular

bricks shall be within the following limits per 20 bricks or

locally available size as approved by Engineer-in-charge.

(a) For Modular Size

• Length 3720 to 3880 mm (3800 ± 80 mm)

• Width 1760 to 1840 mm (1800 ± 40 mm)

• Height 1760 to 1840 mm (1800 ± 40 mm) for 90 mm

`high bricks

• 760 to 840 mm (800 ± 40 mm) for 40 mm high bricks

For internal circulation of BSNLonly

Brick Work

(B) For Non Modular Bricks

• Length 4520 to 4680 mm (4600 ± 80 mm)

• Width 2240 to 2160 mm (2200 ± 40 cm)

• Height 1440 to 1360 mm (1400 ± 40 mm) for

70 mm high bricks

• 640 to 560 mm (600 ± 40 mm) for 30 mm high

bricks

For internal circulation of BSNLonly

Brick Work

• Compressive Strength: The compressive

strength of any individual brick tested shall not

fall below the min. average compressive

strength specified for the corresponding class of

brick by more than 20%.

• Average compressive strength of bricks as given

in next slide:-

For internal circulation of BSNLonly

Brick Work

Class Designation Average Compressive strength

Not less than (N/mm2 ) Less than (N/mm2 )

12.5 (125) 12.5 15.0

10 (100) 10 12.5

7.5 (75) 7.5 10

5 (50) 5 7.5

3.5 (35) 3.5 5

For internal circulation of BSNLonly

Brick Work

• Water Absorption: The average water absorption of

bricks shall be not more than 20% by weight.

• Efflorescence: The rating of efflorescence of bricks shall

be not more than moderate.

• Nil:- When there is no perceptible deposit of

efflorescence.

• Slight:- Not more than 10% area covered by salts.

• Moderate:- Covering upto 50% area by salt.

• Heavy:- More than 50% area covered by salt.

• Serious:- Heavy deposits and repeated by wetting.

For internal circulation of BSNLonly

For internal circulation of BSNLonly