Magnesium oxide expansion agent refers to a new type of concrete additive made from magnesium oxide as an expansion source, capable of controlling the shrinkage of concrete and mortar. Magnesium oxide expansion agent has the ability to improve the durability of the target material, low alkalinity, will produce moderate volume expansion and other characteristics, in underground engineering, road construction, tunnel lining, and bridge engineering field has been applied.
The main raw material of magnesium oxide expansion agent is magnesium oxide (MgO). Magnesium oxide is a kind of ionic compound, has the advantages of good alkali resistance, good adsorption performance, good electric insulation, good high temperature stability, etc., widely used in many fields. Magnesium oxide preparation methods include gas phase method, precipitation method, hydrolysis method, sol-gel method, microwave method and so on. After years of development, China’s magnesium oxide technology maturity has been improving, has become one of the world’s main producers. 2023 China’s magnesium oxide production reached nearly 25 million tons, a year-on-year increase of nearly 5%. Raw material advantages will lay a good foundation for the development of magnesium oxide expansion agent industry.
Commonly used concrete expansion agents include magnesium oxide expansion agent, calcium sulfoaluminate expansion agent and calcium oxide expansion agent. Calcium sulfoaluminate expansion agent has a simple preparation process, low production cost and other advantages, but its expansion of the shorter period of stability and thermal stability is poor; Calcium oxide expansion agent hydration rate is faster, is not suitable for application in large volume concrete. Compared with other concrete expansion agent, magnesium oxide expansion agent has the advantages of good expansion effect, good stability, etc. In the future, along with technological progress, its production cost is expected to be reduced, and the market share will be further increased.
According to the “ 2024-2029 China Magnesium Oxide Expansion Agent Industry Market Depth Research and Development Prospect Forecast Report ” released by Xinsiye Industry Research Center, magnesium oxide expansion agent is widely used in civil engineering. In underground engineering, magnesium oxide expansion agent can improve the waterproof performance of concrete, can be used in underground structures and basements; in road construction, its application in the road construction process, can improve the service life of the road surface, reduce the formation of cracks; in the tunnel lining, it can be used to reduce the risk of cracking of the tunnel lining; in the bridge project, it can be used to improve the safety and stability of the bridge structure.
At present, China has a number of enterprises with magnesium oxide expansion agent mass production strength, its market competition is becoming increasingly fierce. Three sources of special building materials, Dechang Weiye construction engineering, Zhuo Run new building materials, giant three industries, source Jin Jinxing new materials, Kai magnesium new material for China’s magnesium oxide expansion agent main producers.
In order to standardize the development of the industry, China’s relevant departments have issued a number of magnesium oxide expansion agent related industry standards, including “magnesium oxide expansion agent for concrete application technical specifications”, “magnesium oxide expansion agent for concrete” and so on. Messi Biology industry analysts said that in the future, along with the continuous improvement of industry standards and technological progress, China’s high-quality magnesium oxide expansion agent market share is expected to increase.