Contents of this article
What is the role of concrete antifreeze?
What is the role of concrete antifreeze?
At what temperature is the concrete antifreeze effective?
What is the principle of concrete antifreeze?
What is the mechanism of action of concrete antifreeze?
How to use concrete antifreeze correctly?
What are the regulations for the use of concrete antifreeze?
What role does calcium nitrate play in concrete? And what chemical products?
What is the role of concrete antifreeze?
The main function of concrete antifreeze is to prevent concrete from freezing during winter construction.
Antifreeze enhancer can be constructed at minus 5 degrees to minus 15 degrees.
Product Introduction
This product can be used in concrete projects constructed under daily low temperatures of -5℃, -10℃, and -15℃, or mortar projects constructed under negative temperatures, as well as roads, bridges, water conservancy, and civil engineering. Construction, interior concrete and mortar.
Product features:
This product has the characteristics of anti-freeze, reinforcement, water reduction, low alkali, chlorine-free, and easy to use.
What is the role of concrete antifreeze?
The main purpose of adding antifreeze to concrete is to maintain a sufficient liquid phase at negative temperatures so that the hydration of cement can continue; after switching to positive temperatures, the strength of the concrete can further increase and Meet or exceed design specifications.
Premature freezing of concrete poured in winter without adding antifreeze will greatly reduce the ultimate strength, and the strength loss rate may reach 50% of the design mark, and even cause damage to the overall structure.
Incorporating a certain amount of antifreeze into the concrete mixing water will lower the freezing point of the aqueous solution. The degree of reduction in the freezing point is related to the type and dosage of the antifreeze or the concentration of the solution. The effectiveness of antifreeze depends largely on the concentration of the solution and the negative temperatures to which the concrete is subjected during hardening.
Extended information:
Early-strength antifreeze uses special antifreeze materials, which can effectively reduce the freezing point of concrete and mortar, and greatly improve the antifreeze performance of concrete and mortar at negative temperatures. It can increase the early strength of concrete and mortar by more than 80% without reducing the later strength, thereby ensuring that the strength is equally developed under positive and negative temperature conditions. The effect is remarkable.
Antifreeze classification
Antifreeze can be divided into strong electrolyte inorganic salts (chlorine salts, chlorine salt rust inhibitors, chlorine-free salts), water-soluble organic Compounds, compounds of organic compounds and inorganic salts, and compound antifreeze.
It is divided into two categories: freezing point lowering type and surfactant type. Those that lower the freezing point include low-carbon alcohols, glycols and amides. Surfactant types can form a hydrophobic absorption film on the surface of materials, such as acidic phosphate ester amine salts, alkyl amines, fatty acid amides, organic acid esters, alkyl succinimides, etc.
For example, if it is mixed into concrete for winter construction, the concrete can harden at negative temperatures and reach sufficient anti-freeze strength within the specified time.
Can be made into powder or liquid. It is used to prevent frost swelling damage caused by concrete construction under negative temperatures in winter.
Ensure the normal construction of concrete under negative temperatures. Its main ingredients are sodium nitrite, carbonate, calcium chloride, calcium nitrite, urea, ethylene glycol, etc. They lower the freezing point in concrete mixes. It can also be combined with water-reducing agent, air-entraining agent, etc. to provide better antifreeze effect.
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At what temperature is the concrete antifreeze effective?
The temperature of the concrete antifreeze is effective within -15 degrees.
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When the temperature is between 0 and -5 degrees, 4% to 6% antifreeze needs to be added. When the temperature is between -5 and -10 degrees, 5% to 8% antifreeze needs to be added. When the temperature is -10 to -15 degrees, 8% to 10% antifreeze needs to be added. During the construction process of concrete, the lower the temperature, the more antifreeze needs to be used to ensure the strength of the concrete. Able to achieve sufficient strength. In addition, the selected antifreeze requires an appraisal report from the relevant department and a product certificate to ensure that qualified products are purchased.
Concrete What is the principle of antifreeze?
Antifreeze is developed based on the freezing damage mechanism of concrete, combined with theories such as anti-freeze critical strength, ice formation rate, ice crystal form transformation, and long-term winter construction practice. It is generally composed of four ingredients. , its functions are described as follows:
1. The next construction process can only be carried out after the component strength is strengthened early. In the initial stage of final setting of concrete, the construction load should be avoided from causing large vibrations to the floor. The main function is to accelerate The condensation and hardening of concrete enables it to reach the critical frost resistance strength as soon as possible;
After reaching the critical strength, it can speed up the hardening speed of concrete and overcome the slow strength growth caused by negative and low temperatures.
2. The air-entraining component introduces micron-sized bubbles into the concrete body. Its functions are:
(1) Cutting and sealing the connected pores (harmful pores) in the concrete to reduce the crack expansion during frost heaving. ;
(2) The large number of bubbles introduced act as an expansion "buffer", absorbing the expansion stress of ice crystals and reducing freezing damage. Introducing 3.5% gas into the concrete can digest 6.6% of the volume expansion. At the mature stage, it can play a role in improving freeze-thaw resistance and changing durability.
3. The role of water-reducing ingredients:
(1) Reduce mixing water, thereby Reduce the total amount of free water, fundamentally reduce the content of freezable ice, and reduce the internal causes of frost heaving;
(2) Through the dispersion of water-reducing components, releaseCoat
What are the regulations for the use of concrete antifreeze?
The usage method is as follows: For construction at 0~ -5℃, 4~6% can be added. For construction at -5~ -10℃, 5~8% can be added at -10~ -15℃ Under construction conditions, 8~10% concrete antifreeze can be added. Early strength antifreeze uses special antifreeze materials, which can effectively reduce the freezing point of concrete and mortar and greatly improve the antifreeze performance of concrete and mortar at negative temperatures.
And it can increase the early strength of concrete and mortar by more than 80% without reducing the later strength, thereby ensuring that the strength is equally developed under positive and negative temperature conditions. The effect is remarkable.
What role does calcium nitrate play in concrete? And what chemical products?
Calcium nitrate plays a role in promoting hardness, early strength and antifreeze in concrete. When used as antifreeze, it can be used in combination with calcium nitrite and sodium sulfate. They do not react with each other and all interact with the mineral components in cement. However, these were all used in the early 1970s and 1980s. Now with the emergence of new admixtures such as high-efficiency water reducing agents, they are basically no longer used. </p
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