Fabrication And Properties Of Flexible Cement Based Compound For Road Surface

Special application environment of pavement in tunnels demand that the pavement not only have common cement concrete pavement advantages in construction, waterproof,fireproofing security, durability, but also have riding comfort. Exploring a low elastic modulus and high toughness flexible cement concrete pavement materials, have abroad applied field.A single factor and an orthogonal experimental method is adopted to optimize the mix proportion of rubberized lightweight aggregate concrete, in order to decrease the elastic modulus on the premise of necessary strength. Simultaneity, researched the interface between aggregates and hardened cement paste and pore structure by the micro-hardness test, polarizing microscope image analysis and SEM images. Based on the systematic study on the mechanical performance, pavement performance and microstructure, the relation among the constituents, structure and performance and the joint effects are investigated. According to the above research results, the following conclusions can be obtained:1. The optimize mix proportion parameter are: PPF ratio is 1.0%, the mix amount of rubber particles is 10%, polymer-cement ratio is 20% or 3.5%. It with compressive strength above 20Mpa, ratio of bending strength to compressive strength is above 0.32, elastic modulus less than 12.2GPa was produced. It has low shrinkage,high toughness and good durability as well.2. When the introduction of cement mortar in a certain amount of rubber particles add in the porous mortar, it can significantly weaken the interface of sand-cement and rubber- combination of cement. The ratio of mortar Shrinkage significant increased and the intensity reduced, but the mortar flexibility after the accession to the rubber have significantly improved.3. The effect of the cement mortar strength is slight with the addition of PPF . Early contract for mortar crack is a very active role, mortar shrinkage rate is obviously lower, the permeability of the mortar increased, while the mortar flexibility is improved slightly.4. With the rubber and polymer modifing, cement mortar was found that the internal mortar emulsion polymer formed the formation of networks, while ensuring low modulus of elasticity on the premise of the rubber particles,it further enhance the strength of the mortar. It is the foundation for the material uesed in the application.