1. 4.2.4.1 Chemical Admixture 4.2.4.2 Mineral Admixture
4.2.4 Concrete Admixture
Chemical Admixture
Introduction
Water-Reducing Admixture
Hardening Accelerator
Air Entraining Admixture
Set Retarding Admixture
Flash Setting Admixture
Expanding Admixture
Frost-resistance Admixture
Mineral Admixture

2. Introduction
Definition
Classification
Application
Introduction

3. Definition The admixture should not exceed 5% of cement content.
The admixture can adjust properties of the concrete according to the requirements.

4. Classification
Chemical admixtures can be classified into the following four types:
The first one is used to improve rheological behavior, including water-reducing admixture, air entraining admixture and pumping aid
The second one is used to adjust the setting time and to harden the performance, including set retarder, hardening accelerator and flash setting admixture

5. Chemical admixtures can be classified into the following four types:
Classification
Chemical admixtures can be classified into the following four types:
The third one is used to improve the durability, including air entraining admixture, water-repellent admixture and frost-resistance admixture.
The last one is used to improve other performances, including air entraining admixture, expanding admixture, frost-resistance admixture and coloring admixture and so on

6. Classification Water-reducing admixture Improving rheological behavior
Flash setting admixture
Adjusting setting time
and hardening performance
Set retarder
Water-reducing admixture
Pumping admixture
Air entraining admixture
Improving
rheological behavior
Hardening accelerator

7. Classification Air entraining admixture Improving
durability
Air entraining admixture
Water repellent admixture
Anti-corrosion admixture
Adjusting setting time
and hardening performance
Expanding admixture
Coloring admixture
Anti-freezing admixture

8. Application Using admixtures is one of the most effective ways to
improve the concrete strength
improve performances
save on the cement and energy
Concrete admixtures develop rapidly
Their usage in many foreign countries comes up to
60-80%, even 100%.
Nowadays, they have become one of the five components in concrete