What is the difference between early strength agent and antifreeze in concrete admixtures? What is the applicable temperature of early strength antifreeze?

Contents of this article

• What is the difference between early strength agent and antifreeze agent in concrete admixtures?

• Which is better, early strengthening agent or accelerating setting agent?

• Can early-strength antifreeze be used as cement?

• What is the applicable temperature of early strength antifreeze?

• Instructions for use of early strength antifreeze?

What is the difference between early strength agent and antifreeze agent in concrete admixtures?

1. The performance is different.

Concrete early-strength agents refer to admixtures that can improve the early strength of concrete. The varieties of early-strength agents are: calcium chloride, sodium chloride, sodium salt, gypsum, water glass, sodium aluminate, and sodium carbonate. , calcium carbonate, sodium fluoride, triethanolamine, etc.

Early-strength antifreeze has the properties of anti-freezing, lowering freezing point, and significant early-strength effect during use. It can shorten the natural curing time of concrete and improve the frost resistance and impermeability of concrete.

The components of early-strength antifreeze are designed based on the ice crystal transformation theory, and are composed of early-strength, reinforcement, antifreeze, air entrainment, and rust prevention components. Adaptable to various cast-in-place prestressed reinforced concrete. It is suitable for anti-freezing early concrete in industrial and civil buildings, water conservancy, road and bridge construction, etc. It is the first choice admixture for winter construction using the comprehensive heat storage method.

2. The occasions and periods of use are different.

Concrete early strength additives are mostly used in winter or during emergency repairs. Concrete early strength additives have no significant impact on the later strength of concrete, so they should be used in the early stage. Generally speaking, when the temperature of the day is between -5 ℃ and 5 ℃, with alternating positive and negative temperatures, early-strength agent or early-strength water-reducing agent can be used.

If the daily low temperature reaches or falls below -10 ℃, early-strength antifreeze with a specified temperature of -5 ℃ can be used. If the daily low temperature is -15 ℃ or -20 ℃, use early-strength antifreeze with specified temperatures of -10 ℃ and -15 ℃ respectively. The difference between early-strength agents and antifreeze agents in concrete admixtures is that early-strength agents can increase the early strength of concrete, while antifreeze agents can improve the frost resistance of concrete during winter construction and ensure the quality of concrete

Which one is better, early strengthening agent or accelerating setting agent?

Early strength agent is good

Early strength agent is one of the concrete admixtures. Concrete early strength additives refer to admixtures that can increase the early strength of concrete and have no significant impact on later strength.

The main function of early strength agent is to accelerate the hydration rate of cement and promote the development of early strength of concrete; it has both early strength function and certain water reduction and enhancement function. The appearance of this agent is gray powder, and the moisture content is less than or equal to 5. It is a chemically modified composite concrete (concrete) early strength agent with inorganic salt as the main component. It can replace antifreeze within plus or minus 5 degrees Celsius. It has the functions of early strength, water reduction, antifreeze, and enhanced plasticization. Early strength agent is beneficial to increase the early strength of concrete and is a good tool for highway repair.

Can early-strength antifreeze be used as cement?

Cement antifreeze is harmless when the dosage is less than 5% of the cement dosage. When the dosage is large, it will cause false setting of cement and reduce the strength of cement mortar or concrete. Therefore, it must be used in strict accordance with the laboratory mix ratio. Ingredients.

Ordinary Portland cement has no effect. The traditional method is to add brine during the stirring process. Special cement has strict requirements, and ordinary antifreeze cannot meet the requirements.

The addition of antifreeze must be carried out in accordance with the data given by the laboratory. If too much is added, false setting, reduced strength, and reduced slump of the concrete will occur.

What is the applicable temperature of early strength antifreeze?

Hebei Zhusheng Building Materials Technology Development Co., Ltd. produces ZS-102 early-strength antifreeze, which has anti-freezing, lowering freezing point, and significant early-strength effects during use. It can shorten the natural curing time of concrete and improve Frost resistance and impermeability of concrete.

It is an antifreeze composed of components such as water reduction, early strength, freezing point reduction, and frost damage prevention. It has multiple functions such as early strength, antifreeze, appropriate air entrainment, and corrosion protection.

Significantly improves the early strength, and the strength continues to increase in the middle and late stages. It is an ideal admixture product for winter construction.

Early-strength antifreeze is suitable for mortar and concrete projects within the range of -15℃.

Early strength antifreeze instruction manual?

It has obvious early strength, air entrainment and anti-freeze effects. It can be used in concrete construction with the lowest daily temperature of 0℃~-20℃, and has no rust effect on steel bars.

Scope of application:

Poured-in-place or precast concrete for various industrial and civil buildings, various steel bars and prestressed reinforced concrete for highways, airports, tunnels, bridges, etc.

Technical indicators of early-strength antifreeze:

The project standard stipulates the technical indicators of first-class early-strength antifreeze

Water reduction rate (%) ≥ 810

p>

Air content (%) ≥ 2.53.0

Bleeding rate ratio (%) ≤ 10035

Compressive strength ratio (%) specified temperature ℃-5 -10-15-5-10-15

R-7d201210251612

R28d959590110110110

R-7+28d95908510810095

R-7 +56d100115110105

Setting time difference (min) Initial setting-120~+120+30

Final setting-120~+120+45

Impermeability height ratio (%)≤10070

Alkali content (kg/m3)≤10.65

90d shrinkage ratio (%)≤120105

50 freeze-thaw strength loss Rate ratio (%) ≤ 10055

The corrosion effect on steel bars should indicate that there is no rust or corrosion on steel bars

Homogeneous performance:

Appearance: light gray powder; Moisture content: ≤3%; Fineness: 0.315 sieve all passed; cement slurry fluidity ≥150mm</p