The free water that can be frozen inside the concrete is greatly reduced, the impermeability of the concrete is improved, and the freeze-thaw resistance is strengthened. Compared with other types of water-reducing agents, polycarboxylic acid water-reducing agents have stronger dispersibility of cement particles. They can optimize the internal pore structure and pore size of concrete, increase the density of concrete, reduce bleeding channels, and further improve the impermeability of concrete.
The polycarboxylate water reducing agent also has a certain air-entraining capacity, which will introduce some stable bubbles into the concrete, so that the expansion pressure concentration caused by freezing and the migration of supercooled water can be effectively relieved, and the concrete's freeze-thaw resistance performance Can be significantly enhanced.
The chloride ion content, sodium sulfate content, and alkali content of polycarboxylic acid water reducer are lower than other types of water reducers, which is more conducive to the durability of reinforced concrete. Some data show that adding polycarboxylic acid water-reducing agent to ordinary reinforced concrete can also increase the bond strength of steel-concrete.
