How is the nitrate on the wall formed?

Nitrate on the wall is mainly because the sand in concrete contains more saline and alkali. When it is in a humid environment, salt and alkali react with cement, thus forming white material on the wall, and then it seeps out later to form nitrate. Nitrate is saline-alkali. When the wall is resistant to nitrification in a large area, if it is not treated, the coating of the alkali-returning wall will shell and fall off in the future.

The treatment suggestions are as follows: 1. Brush the alkali-returning wall several times with a hard brush (it must be dry brush, and it can't be completely removed by washing with water or neutralizing with acid), and then clean it up. Second, the putty bottom adopts the construction technology of exterior wall waterproof coating for the first time, that is, building white cement 0.8+ putty powder 0.2 mixed with JS waterproof agent as the base. Subsequent processes can be carried out according to the normal coating construction process.

Saline-alkali land is a kind of salt accumulation, which means that the salt contained in the soil affects the normal growth of crops. Generally, it is formed under the influence of natural conditions such as dry climate, little rain, large evaporation, low terrain, high groundwater level and high salinity and human activities.

Engineering measures such as canal repair, deep well drilling and dredging in saline-alkali land reconstruction require a large amount of manpower, material resources, financial resources and technology. At present, due to farmers' low economic level, limited investment ability and low investment will, it is difficult to expand the scale of reconstruction, mainly relying on state investment.