Chemical Admixture Mineral Admixture

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Presentation transcript:

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

Introduction Definition Classification Application Introduction

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

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

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

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

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

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