1 Introduction

The emergence of concrete admixtures is very necessary and timely, because in the process of social development, people have higher and higher requirements for the strength of concrete, and also have higher requirements for the durability and early strength of concrete . Therefore, in the process of concrete preparation, adding concrete admixtures is an indispensable measure.

2 The effect of water reducer on concrete properties

Under the current social development and the development of basic industrial construction, the demand for concrete is increasing, and adding additives to concrete has become a mainstream production method. The admixture added to concrete has become one of the main raw materials for concrete preparation today, which reduces the amount of cementitious materials in the concrete preparation process, greatly reduces the cost of concrete preparation, and can increase the fluidity, strength and strength of concrete. Impermeability. Concrete water-reducing agents can be mainly divided into three generations: the first generation is based on lignosulfonate-based water-reducing agents; the second-generation is naphthalene water-reducing agent, sulfamate water-reducing agent and acetone water-reducing agent Mainly; the third generation is polycarboxylate superplasticizer. The third-generation water-reducing agent is also the main water-reducing agent used in the concrete preparation process, because compared with the first two water-reducing agents, the third-generation water-reducing agent can improve the water-reducing rate and reduce the concrete slump. drop, the effect is better. But this does not mean that the 3rd generation superplasticizer is perfect, and the 3rd generation superplasticizer also has some problems, for example, it cannot meet the requirements of cement performance, and it is incompatible with other high-efficiency superplasticizers. In this part of the problem, coagulant can be added to the water reducing agent, which can not only reduce the cost of raw material input, but also enhance the practicality of concrete.

3 Use of concrete admixtures

In the process of concrete preparation, although the admixture has a great influence on the performance of concrete, it is still necessary to pay attention to the use of the admixture during the use of the concrete admixture. Because the properties of the concrete used are quite different for the quality requirements of different engineering projects, the following aspects need to be considered in the use and selection of admixtures: the nature of the project and the main purpose of concrete . Because the specific requirements of design and construction are different for different factories, in order to ensure the smooth start of the project, and to reduce costs and quality performance, it is necessary to select the additives in the use process.

4 Conclusion

It is self-evident that concrete admixtures can improve the performance of concrete. Therefore, in the process of concrete preparation, on the one hand, in order to improve the performance of concrete, on the other hand, in order to reduce the input of various raw materials in the process of concrete preparation, concrete admixtures should be selected reasonably. By increasing the types and effects of concrete admixtures, gradually improve various properties in the process of concrete preparation, to ensure that concrete can play a more important role in the future technological development and the development of the construction industry, and will not be eliminated by the times.