Research progress of waste rubber modified cement-based materials
Rubber particles have good energy absorption and deformation ability.The incorporation of rubber particles into cement base can effectively improve the toughness of the material,and enhance the freezing resist-ance,cracking resistance,impact resistance and other properties of cement base.However,because rubber par-ticles are a kind of hydrophobic substance,the interface bonding force between rubber and cement slurry is weak,and the strength of cement-based materials is decreased.Therefore,chemical and physical modification of rubber cement-based materials is studied.The results show that the modified rubber can enhance the properties of cement-based materials in two ways.First,the modifier can improve the hydrophilic of rubber by dissolving the impurities on the surface of rubber particles and forming a film on the surface.Second,the modifier reacts with the hydration product to form an effective chemical cross-link,so that the rubber particles form a close connection with the cement slurry.At the same time,it is found that rubber particles and fiber polymers have synergistic effect on the strengthening and toughening of cement-based materials.
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