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Concrete accelerator is an admixture that can accelerate concrete's setting and hardening speed. It is widely used in civil engineering, water conservancy hydropower and other fields.
With the continuous development of science and technology, the research and application of concrete accelerators are also deepening. This paper will summarize the types, action mechanisms, influencing factors, and application status of concrete accelerators.
Concrete accelerators are mainly divided into two categories: inorganic salts and organic polymers.
The main components of inorganic salt accelerators are aluminate and carbonate, and their action mechanism is mainly through chemical reactions with the components of cement to form hydration products to accelerate the setting and hardening of concrete.
Organic polymer accelerators are mainly composed of polymers and amine salts, and their action mechanism is that they have high reaction activity through the adsorption of polymer chains on the surface of cement particles, thus accelerating the setting and hardening of concrete.
The concrete accelerator's action mechanism mainly includes hydration, crystallization and pozzolanic reaction.
There is a chemical reaction between the accelerator and the components in the cement to form hydration products, which will quickly form a crystal structure, which makes the concrete lose its fluidity and plasticity quickly and achieve the purpose of rapid setting.
At the same time, the accelerator will also promote the reaction of tricalcium silicate in cement with water to form calcium silicate hydrate and further accelerate the hardening of concrete.
The factors that affect the effect of concrete accelerator mainly include the following aspects: type and content of accelerator, variety and content of cement, water-cement ratio, type and gradation of aggregate, environmental temperature and humidity, etc.
Different accelerators have different action mechanisms and effects, so they must be selected according to engineering requirements and actual conditions in practical application.
At the same time, the variety and content of cement, water-cement ratio, aggregate type and gradation, and other factors will also affect the effect of the accelerator, so it is necessary to consider various factors comprehensively for optimal design.
Concrete accelerators have been widely used in civil engineering, water conservancy, hydropower, and other fields, mainly used in emergency repair, road, tunnel, and other fields.
In emergency repair projects, the concrete accelerator can effectively shorten the project period and improve the engineering efficiency; in road engineering, the concrete accelerator can improve the wear resistance and compressive strength of the pavement; in tunnel engineering, the concrete accelerator can quickly achieve the purpose of tunnel support and improve the safety and reliability of tunnel construction.
As an important admixture, concrete accelerator plays an important role in civil engineering, water conservancy, hydropower, and other fields.
With the continuous development of science and technology, the research and application of concrete accelerators are also deepening.
In the future, it is necessary to study the action mechanism further and the influencing factors of the accelerator and explore more efficient, environmentally friendly, and safe accelerator materials to meet the requirements of engineering and sustainable development.
At the same time, it is necessary to strengthen quality control and safety management in the production and use of accelerants to ensure the quality and safety of the project.
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