Cement grouting material carbonization

Cement grouting cement grouting material cement-based grout curing grouting material of carbide carbide is one of the types of concrete grouting materials by chemical etching. The CO2 gas in the air penetration into concrete, and its basic substances react after form carbonates and water, reduce concrete alkalinity process known as concrete carbonization, also called neutralization, the chemical reaction is: Ca ( 哦) 2+CO2=CaCO3+H2O. Cement generated a lot of calcium hydroxide in the process of hydration, make concrete grouting material gap was filled with saturated calcium hydroxide solution, the alkaline medium for steel has a good protective effect, make the generation of refractory steel surface Fe2O3 and Fe3O4, called passivation membrane. Carbide to lower alkalinity of concrete grouting material, after when carbide over protective layer of concrete grouting material, in the presence of water and air, can make the losing of reinforced concrete grouting material protection, reinforced began to rust. Visible, concrete carbonation generally does not directly cause the performance degradation, for plain concrete carbonization and the effect to improve the durability of concrete, but for reinforced concrete grouting material, carbide will reduce the alkalinity of concrete, at the same time, increase the number of hydrogen ion in concrete pore solution, which can make the protection for reinforced concrete effects.