A professional chemical practitioner must understand more comprehensive concrete-related knowledge. General self-compacting concrete admixtures are indispensable knowledge for construction workers. If you are still confused about this, the editor of Anhui Yulong New Materials Co., Ltd. will explain the relevant indexes in detail!
1. What is a self-compacting concrete admixture?
Self-compacting concrete admixtures are chemical substances that are added during the mixing process of concrete and account for less than 5% of the cement mass. They can significantly improve the performance of concrete. Adding admixtures to concrete has the advantages of low consumption, quick results, and significant technical and economic benefits. Features. With the continuous advancement of science and technology, self-compacting admixtures have been increasingly used. Self-compacting admixtures have become the fifth important component in addition to the four basic components of concrete. The product quality of self-compacting concrete admixtures must be qualified and should be tested before use. They must have factory quality certificates and test reports.
The content of the certificate includes the name of the manufacturer, product name, product characteristics, main ingredients and content, scope of application, suitable dosage, usage methods and instructions, precautions, homogeneity indicators, concrete mixed with admixtures Performance indicators, packaging, quality, storage conditions, factory date, validity period, etc. Different admixtures have different corresponding test items, generally including water reduction rate, slump, air content, bleeding rate, setting time, compressive strength, steel bar corrosion, relative durability indicators, etc. The client, client, project name, purpose, sample name, origin and manufacturer, date of sample receipt, and required test items in the test report shall be filled in by the client, and the remaining parts shall be filled in by the test personnel. Fill in the form based on the test calculation results and sign and seal it.
2. What are the uses and characteristics of self-compacting concrete admixtures?
1. Purposes
Self-compacting concrete admixtures can be used for special density reinforcement. , concrete projects with complex shapes that are inconvenient to vibrate, renovation and reinforcement of concrete projects, special projects that require high bonding strength at the interface between new and old concrete, and have the functions of frost-resistant, impermeable, and anti-corrosion concrete. It is often used in the construction of waterproof concrete, steel pipe concrete and shrinkage-compensating concrete. Self-compacting concrete admixtures can also be used in the self-leveling construction of large-area concrete floors. It is suitable for fluid plasticized concrete, natural curing, steam curing concrete, impermeable and waterproof concrete, durable freeze-thaw resistant concrete, sulfate erosion resistant marine concrete, as well as steel bars and prestressed concrete. It has wide applicability to cement and is easy to use. It has good properties and cohesiveness, and is well compatible with other types of admixtures.
2. Characteristics
The self-compacting concrete admixture has high fluidity to ensure that the concrete can self-flow and densely form. It also has high cohesion to ensure that the concrete does not flow and be parked during the process. Segregation occurs, and its high water retention ensures no bleeding on the surface during the concrete hardening process. Its high strength (high strength up to 100MPa), high frost resistance, and high impermeability ensure safety performance to a great extent. It does not shrink during the hardening process, has micro-expansion, has high bonding strength with old concrete, is resistant to chloride ion corrosion, and has excellent rust resistance. It has strong resistance to vibration interference during the setting and hardening process, and can interrupt traffic construction during the reinforcement of highways and railway bridges.
The function of self-compacting concrete admixtures is to make the use of self-compacting concrete more convenient, make it more adhesive, more suitable for construction projects, and easy to integrate with other building materials. It greatly increases the viscosity of concrete and ensures the safety performance of the building after construction. Self-compacting concrete admixture is a highly cost-effective construction raw material auxiliary.
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