Why Do Most Construction Now Choose Alkali-free Accelerator Instead Of Alkali Accelerator?

Accelerators are divided into two types: alkaline accelerators and non-alkaline accelerators. Why do most constructions now choose non-alkaline accelerators instead of alkaline accelerators? Here's what you need to know:

Alkaline accelerators have advantages such as high expansion rate, high early strength, and low cost. However, they also have drawbacks such as high alkali content, rapid hardening, and a tendency to cause alkali-aggregate reactions. They are made from materials like aluminum hydroxide, sodium hydroxide, and calcium oxide, mixed with a certain amount of retarders. The raw materials are industrial solid wastes containing a certain amount of impurities like chloride ions.

3. : The use of alkaline accelerators can negatively impact concrete durability, reducing its freeze-thaw resistance and carbonation resistance.
7. : Chlorine-containing accelerators can decompose into chloride ions during production, causing environmental pollution.

Non-Alkaline Accelerators

Non-alkaline accelerators do not have these issues. They have minimal impact on the later strength of concrete and can improve the durability of concrete. In environmental engineering, non-alkaline accelerators are essential.

: Non-alkaline accelerators are preferred over alkaline accelerators due to their minimal impact on concrete strength, improved durability, and reduced environmental and human health risks.