How Much Slump Should Be?

 Slump Should Be Minimum 13mm and Maximum 230mm

Why Slump Test Perform?

 To Know The Worability Of Concrete.

How Many Kind Of Admixture?

 Seven Kinds

A- Reducer

B- Returder

C- Acclerator

D- Reducer And Returder

E- Reducer And Acclerator

F- High Range Water Reducer

G- High Range Water Reducer and Returder.

Why We Use Returder Admixture?

To Increase Setting Time Of Concrete. 

About Vibrator Uses.

 Vibrator Should use Vertically Not Be Inclined.

Hight Limitation Of Fall Down Of Concrete.

 Not More Than 1.5 Meter.

About Slump.

 The More The Slump The More The Concrete Is Soft.The More The Soft Concrete The More Advantage To Take Placement Of Concrete.

How You Take Sample Of Cement From Field To Lab?

 Must Be Take Sample By Air Tight.

Field Test Of Cement.

 1. Floating Test

2.You Feel Cold When You Enter Your Hand Into Cement's Bag.

3.Finness Test.

4.When You Fall down One Muth Of Cement Into One Bucket of Full of water If You Feel Hot At Your Hand You Can Understand That The Cement Is Good.

What do you understand if you see This Type of written word at Cement's Bags?

 

 CEM1 is OPC ( 95% Clinker and 5% Gypsum )

CEM2 and Others are PCC  ( 65% Clinker )

Note: At OPC Clinker Amount Is Higher Than PCC.So OPC Cost is Higher Than PCC.

How many kind of cements we use in construction?

 Answer:

2 kinds

1.OPC ( Ordinary Portland Cement )

2.PCC  ( Portland Composite Cement )