Pneumatic cementing material:
A non-hydraulic cementing material. Pneumatic cementing materials, such as lime, gypsum, bentonite and water glass, can only harden in the air and maintain and develop their strength in the air; Generally, pneumatic cementing materials are only suitable for dry environment, not for wet environment, not to mention water.
Pneumatic cementing materials can only be hardened in air and maintain or maintain technical materials to improve their strength.
Hydraulic cementing material:
It can harden not only in air, but also in water, and maintain and continue to develop its strength, such as various cements. 1824, British engineer asp obtained the first cement patent, which marked the invention of cement. The invention of cement provided a material basis for the development of building engineering, which made it develop from land engineering to underwater and underground engineering. Cement has been invented for more than 100 years, and it has been the most widely used cementing material.
Pneumatic cementing materials such as lime, gypsum and water glass.
1, their gelation process can only be formed and developed in air environment, and water retention is not allowed;
2. Generally speaking, their gelation process is very long and their strength develops slowly;
3. Both of them have good workability and are convenient for construction;
4. Their ultimate strength is not very high, and they are not suitable for making load-bearing members with large loads;
5. It cannot be used to work with steel bars to bear a large load;