▎ 摘　　要

NOVELTY - Preparation of three-dimensionally printed cement noise reduction barrier involves (1) mixing 100 pts. wt. Portland cement, 100 pts. wt. quartz sand, 10 pts. wt. mineral powder, 10 pts. wt. fast hardening sulfoaluminate cement, 10 pts. wt. calcined clay and 2 pts. wt. sound-absorbing cotton fiber, mixing with water and 0.2 pt. wt. water reducing agent, adding 5 pts. wt. graphene dispersion, mixing, obtaining three-dimensionally printed graphene/sound-absorbing cotton fiber substrate reinforced composite cement slurry, (2) establishing three-dimensional printing program, feeding the reinforced composite cement slurry into feed system connected with printing nozzle for layer-by-layer printing, obtaining noise reduction barrier unit component, (3) transporting after 15 days of maintenance for the noise reduction barrier unit component to expressway site for hoisting and splicing, assembling, and coating adjacent joints of the noise reduction barrier unit component with cement slurry. USE - Preparation of three-dimensional printed cement noise reduction barrier. ADVANTAGE - The method produces three-dimensional printing cement noise reduction barrier based with excellent pumpability, extrudability and cohesiveness, high strength, excellent plasticity, and space forming and modeling capabilities. The noise reduction barrier has a more complex structure and shape, and excellent sound insulation and noise reduction effects. In the method, the overall assembly is completed without the use of templates, which reduces the difficulty of construction, shortens the construction time, reduces the cost of construction, and reduces the number of on-site construction personnel. DETAILED DESCRIPTION - Preparation of three-dimensionally printed cement noise reduction barrier involves (1) mixing 100 pts. wt. Portland cement, 100 pts. wt. quartz sand, 10 pts. wt. mineral powder, 10 pts. wt. fast hardening sulfoaluminate cement, 10 pts. wt. calcined clay and 2 pts. wt. sound-absorbing cotton fiber, adding to concrete electric mixer, stirring at 60 rpm for 5 minutes, mixing water and 0.2 pt. wt. water reducing agent in a clean container until uniform, adding to mixer under working condition, mixing at 60 rpm for 5 minutes, adding 5 pts. wt. graphene dispersion to the mixer under working condition, mixing at 100 rpm for 10 minutes, obtaining three-dimensionally printed graphene/sound-absorbing cotton fiber substrate reinforced composite cement slurry, (2) completing three-dimensional computer-aided design modeling of the noise reduction barrier through computer modeling software, converting into standard template library data, inputting into cement three-dimensionally printing molding system, layering and slicing, setting three-dimensional printing parameters, establishing three-dimensional printing program, feeding the reinforced composite cement slurry into feed system connected with printing nozzle for layer-by-layer printing, obtaining noise reduction barrier unit component, (3) transporting after 15 days of maintenance for the noise reduction barrier unit component to expressway site for hoisting and splicing, assembling based on the upper and lower wedge of the noise reduction barrier unit component when splicing, coating adjacent joints of the noise reduction barrier unit component with cement slurry, and determining height and length of the noise reduction barrier according to the noise situation of the specific road section. The height of the noise reduction barrier is 4-5 m.