| Coloured pavements can beautify roads,effectively improve the road environment,guide traffic flow and ease traffic,but fading,peeling and other diseases appear earlier in the service process.With the development requirements of green low-carbon transportation,water-based coloured asphalt pavement has become a hot spot.This thesis uses water-based epoxy emulsion modified acrylic emulsion,with iron oxide inorganic pigments,mica powder,artificial coloured ceramic particles,to obtain a green environmentally friendly water-based acrylic colour anti-skid wear layer.First,the waterborne epoxy-acrylic acid two-component binder was prepared by physical blending,and the performance of the binder with different ratios was compared and analysed by means of compatibility test and tensile test,and the dosing range was formulated,and finally the optimal ratio of the base material was determined by orthogonal test and the relevant technical requirements of the base material were tested.When the epoxy emulsion:Silicone propylene emulsion 6189:phenylpropyl emulsion615:pure propylene emulsion 6699=1:0.3:0.3:0.4 and epoxy emulsion:curing agent=1.75:1,the curing time of the binder at 40℃≤24h,the bond strength reaches2.72MPa,shear strength reaches 2.57MPa,tensile strength reaches 11.17MPa,elongation at break reaches 35.23%,the mechanical properties are good.The water resistance,alkali resistance,heat resistance and low temperature crack resistance of the binder meet the requirements.Second,the composite binder was subjected to UV ageing and thermal oxygen ageing treatments to compare the colour changes of the coatings before and after ageing.The physical properties and microstructure of the coatings were studied by tensile test,pull-out test,IR spectroscopy,TG,DSC,etc.under different admixtures of colour fillers.The base material showed yellowing and hardening after different ageing treatments,and the colour retention,toughness and anti-ageing properties were improved after the admixture of pigment fillers.Taking into account,the best dose of all three pigments is3%,the best dose of mica powder is 20%,and the best ageing resistance of iron oxide red,at this time the red paint purple ageing colour difference is 2.73,elongation at break is 36.63%,Tg is 53.5°C,the rate of mass loss is significantly reduced,the three colours coating film water resistance,alkali resistance,low temperature crack resistance,bonding performance are better.Third,according to the influence of the colour filler on the aging resistance of the base material,the colour base ratio of the water-based acrylic colour anti-slip abrasion layer was determined to be 0.23:1.0,and the optimum addition amount of stone was determined by the 1h wet wheel abrasion test(WTAT)and the pendulum meter test,At this time,the wet wheel wear values are 85.7g/m~2,101.2g/m~2and 104.0g/m~2for 1h and116.2g/m~2,135.4g/m~2and 147.8g/m~2for 6d respectively;the friction coefficients are0.95,0.99 and 1.08 respectively,and the construction depths are 1.42mm,1.62mm and1.91mm respectively,1.62mm,1.91mm,the three particle sizes of water-based epoxy-acrylic coloured anti-slip abrasion layer all meet the specification requirements. |
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