Basic Material

Acceptance of Basic Materials: –

 

          Concrete consists of course & fine aggregate, water cement, Admixture Etc.

Course aggregate:

Sp Gr Test                                                                 – Not less then 2.6

Seave analyses                                                    – Should pass through graded material zone

Elongation                                                              – 15 % by weight

Flaky                                                                           – 15 % by weight

Any other yellow / non acceptable materials               -Not more then 3 %

(Flaky + Elongation + Any other yellow / non Acceptable materials) = 30% Maximum   

 

Fine Aggregate

 

Sp Gr Test                        – Not less then 2.5

Silt test                              – 3 to 6 % by volume

Seave test                        – Should be Zone-1 & Zone II Material

Cement test                   – grade of cement

Date of manufacturing            –

Water                                 – Ph value should not be less then 6

Admixture

Manufacture test certificate    –

Local testing authority            –

 

Tests conducted after mixing

 

Workability                   

– Slump 55 to 75 for manual concrete

– Slump 75 to 90 for Bucket with Crain

-Slump between 90 to 110 for Pump

Cohesiveness                  

-Edges and corners of CA should not be visible by eyesight.

compressive strength   

-Cubes of size 150mm coasted and 7^th day and 28^th day strength will be  seen and documented. 

 

Note: – Cubes top surface to be finished as good as side faces and wile testing numbered surface should face the front, that is    person who is testing.