The problems of cold weather concreting arise from the action of frost on fresh concrete. If the wet concrete is allowed to freeze, the mixing water converts to ice and there is an increase in overall volume of concrete. Since there is now no water available for chemical reactions, setting and hardening of concrete are delayed.
- What is Hardening Accelerating Admixture?
Early strength agent is an additive that accelerates cement hydration and improves the early strength of mortar. It is mainly used in concrete to help the cement harden quickly at low temperatures, allowing the concrete to reach higher strength in a short time to meet the requirements of withstanding external forces. Early strength agents can greatly shorten the final setting time of concrete, allowing it to be demoulded as quickly as possible, while increasing the output of concrete products and reducing production costs.
2.Types
There are various types of early strengthening agents, most of which are inorganic electrolytes, and a few are organic compounds. Common early strengthening agents include calcium chloride, sodium chloride, mirabilite, gypsum, water glass, sodium aluminate, sodium carbonate, calcium carbonate, sodium fluoride, triethanolamine, etc. Among them, chloride-based early-strength agents such as CaCl2 have good effects. In addition to improving the early strength of concrete, they also have accelerating and anti-freezing effects. However, the disadvantage is that they will corrode steel bars; sulfate-based early-strength agents such as sodium sulfate are mostly composite Use: Organic early-strengthening agents mainly include triethanolamine, triisopropanolamine, etc. Among them, triethanolamine has a retarding effect and is often used in combination with other early-strengthening agents.
3.Usage
When using early-strength additives, the mixing ratio needs to be determined based on the strength grade of the concrete, construction environment, temperature and other factors, which is generally 1-3% of cement. At the same time, the mixing method should be the same as that of conventional concrete to ensure that the early strength agent is fully dispersed and avoid agglomeration. The ambient temperature of early strength agent should be above 5℃, and it is not suitable to be used in rainy season and high temperature season.
Generally speaking, early strength agents are widely used in concrete projects, especially in low-temperature environments or projects that need to achieve strength quickly. However, it is also necessary to pay attention to factors such as its type, dosage, and usage environment when using it to fully exert its effect and ensure the quality of concrete.
Using our Seed Hardening Accelerating Admixture can effectively improve the problem.
It is a hardening accelerator for concrete and mortar. It promotes early strength development without negatively influencing final strengths.
Product overview: S7044 is a powdered nano-seed early strength agent based on hydrated calcium silicate designed to promote the hydration process of early cement (within 24 hours). It is widely used in high-alumina system and sulfur-aluminum system, which plays a role in promoting setting time and early strength.
Compared with lithium carbonate: 1. It does not affect the strength in the later stage, and 2. The comprehensive cost is lower.
Product features: S7044 can promote the hardening of cement at low temperature or curing, especially under low temperature conditions. It has strong adaptability, and has a coagulation effect on ordinary silica cement, sulfur-aluminum cement and high-alumina cement, and improves the early strength of the cement.
Scope of application: sulfur-aluminum system mortar, high-alumina system mortar repair mortar, grout, self-leveling, tile adhesive and other high-performance mortar
Recommended dosage: 0.1%~1.0% of the amount of glue
Storage: 25kg paper bag packaging, dry storage at room temperature, 12 months from the date of production. If the product exceeds the warranty period, it needs to be verified by the test before it can be used.
Product data:
appearance: gray powder
moisture content: ≤3%
bulk density: 400-700kg/m3