Research Of Magnesium Phosphate Cement Modified By Fiber And Application In Pavement Repair

Concrete pavement has lots of advantages, such as surface stiffness, high strength, simpleconstruction and good stability. Whether domestic or foreign, concrete pavement accounts for asizeable proportion. Concrete pavement, however, also appears more common damage, and evenaffect the normal passage of the road, especially the local trunk roads similar to the problem is veryserious. Without considering the impact on traffic, the repair of damaged road is relatively simple,the cost is relatively low. Usually be the same with the original pavement materials and processes,can be partial repair or repair of the entire board, but damaged the road to clean up, repair, health tothe required opening up the traffic intensity, may take up to a month or so, wintertime longer. Phosphate cement-based materials is a new cementitious material condensationhardening a acid-base reactions and physical interactions, with high early strength, good bondingproperties, good abrasion resistance, volume stability, etc., is a kind of broad prospects fordevelopment of cement concrete pavement rapid repair materials. Phosphate cement-based materialsare mainly concentrated in the preparation of the cement, hydration products and mechanism of howto reduce its brittleness, its toughness and impact resistance is not the system. This article aims toanalyze the cement concrete pavement damage types and causes, combined with the existingphosphate cement the status quo on the basis of discussion on the incorporation of the fibers ofdifferent types of phosphate cement mortar flexural and compressive strength, toughness and impactresistance the impact of the performance. In addition, by measuring the micro hardness to furtherexplain the impact of fiber on the flexural strength of phosphate cement mortar.By changing the different kinds of fiber and ash, found that the fibrous phosphate cementflexural and compressive strength are significantly improved; From the performance of magnesiumphosphate cement, fiber volume content should not exceed1.5%; the same as in the aspect ratio thecase of wavy steel fiber reinforced phosphate cement mortar flexural strength improved the best;content under certain circumstances, the steel micro-fiber against the fold, the compressive strengthincreased the role of the best. Enhance the role of steel fiber reinforced phosphate cement mortartoughness and confrontation fold strength of the law. It was found that the wavy steel fiber with6mm polypropylene fiber composite when synergies, especially the shear wave of steel fiber volumefraction of1.5%and6mm polypropylene fiber volume fraction of1.0%, the improvement of flexuralstrength flexural strength than the benchmark,3d, more than80%. In addition, the fiber cansignificantly improve the impact resistance of magnesium phosphate cement specimens, the fibercomposite to improve the degree of impact resistance of magnesium phosphate cement is the most obvious, especially shear waves of steel fiber volume fraction of1.5%and6mm polypropylene fibervolume fraction of1.0%of the compound, its ability to impact and content of1.0%micro steelfibers quite; water-cement ratio on the impact resistance of micro steel fiber, was found when thewater glue even200times the impact than0.18, with1.5%micro-steel fiber3d did not find thecrack. Finally, the paper by the comparison of the effect of ordinary magnesium phosphate cementmodified magnesium phosphate cement with fiber-site repair, fiber modified magnesium phosphatecement repair process.