Cellulose fibers improve the mechanical properties of concrete

1. Crack-resisting effect on concrete
Cellulose fibers are three-dimensionally distributed in concrete, which can effectively reduce the stress concentration at the tip of microcracks, weaken or eliminate the tensile stress caused by dry shrinkage of concrete or mortar, and prevent the occurrence and expansion of microcracks.
2. Improvement of concrete impermeability properties
The uniform distribution of cellulose fibers in concrete forms a supporting system, which hinders surface water precipitation and aggregate settlement, reduces the bleeding of concrete, reduces the bleeding channels of concrete, and greatly reduces the porosity in concrete. Therefore, The impermeability performance of concrete is significantly improved.
3. Improve the freeze-thaw resistance of concrete
The presence of cellulose fibers in concrete can effectively reduce the concentration of tensile stress in concrete caused by multiple freeze-thaw cycles, preventing further expansion of micro-cracks. In addition, due to the improvement of concrete's impermeability, it is of course also beneficial to improve its freeze-thaw resistance.
4. Improve the impact resistance and toughness of concrete
Cellulose fibers help absorb the impact of concrete components, and due to the crack-resistance effect of fibers, when concrete is subjected to impact loads, fibers can prevent the rapid expansion of internal cracks, so they can effectively enhance the impact resistance of concrete. and resilience.
5. Improvement of concrete durability
Due to its good crack-blocking effect, cellulose fiber greatly reduces the occurrence and development of cracks. The reduction of internal porosity slows down the erosion and penetration of corrosive water and chemical media, chlorine salts, etc. in the external environment. Due to the cracks It is greatly reduced and the channels for corrosion of the main structural steel bars are reduced, thereby greatly improving the durability of the concrete.
6. Improvement of high temperature resistance of concrete
When cellulose fiber is added to concrete, especially high-strength concrete, it contains a large number of evenly distributed fiber monofilaments that are distributed randomly in three dimensions, forming a three-dimensional network structure. When the internal temperature of the flame-baked concrete component rises to 165 When the temperature is above ℃, the fibers melt and form internal connected pores for strong high-pressure steam to escape from the inside of the concrete, so it can effectively avoid bursting in fire environments.