Mechanical anisotropy and interlayer bonding strength of 3D printing geopolymer
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摘要: 3D打印地聚合物是一种兼具资源化利用及智能建造的新型建筑材料，其试件各方向上的力学性能和层间的黏结强度是影响建筑可建造性和耐久性的重要因素。以粉煤灰、石英砂为主要原材料，无水硅酸钠为碱激发剂，矿粉为辅助性胶凝材料，硅酸镁铝为专用外加剂，制备了3D打印粉煤灰基地聚合物砂浆；在最适宜掺量和配比下，3D打印出粉煤灰基地聚合物3D打印试件，研究了其层间黏结强度与抗拉强度，并且通过力学性能及超声波速表征其力学各向异性性能。Abstract: 3D printing geopolymer is a new type of building way and material with both of resource utilization and intelligent building. The mechanical properties in all directions and the bonding strength between layers of components are important factors affecting the constructability and durability of buildings.3D printing geopolymer mortar was prepared with fly ash and quartz sand as main raw materials, anhydrous sodium silicate as alkali activator, slag powder as auxiliary cementitious material, magnesium aluminum silicate as special additive. The 3D printing component of fly ash-based geopolymer was prepared under the condition of the optimum dosage and proportion. The interlayer bonding strength and tensile strength were studied, and the mechanical anisotropy properties were characterized by mechanical properties and ultrasonic pulse velocity.
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图 1 3D打印地聚合物试件层间作用力取样方式示意图
Figure 1. Schematic diagram of sampling method for interlayer force of 3D printed geopolymer component
图 2 层间作用力的测试示意图
Figure 2. Schematic diagram of testing method and device of interlayer force
图 4 各向异性力学性能取样及加载方式示意图及实物
Figure 4. Real figure and schematic diagram of sampling and loading method of anisotropic mechanical properties
图 5 狗骨形试件抗拉强度与不同打印层数的打印试件的层间黏结强度值
Figure 5. Tensile strength of dog-bone components and interlayer bonding strength values of printed components with different printing layers
表 1 主要原材料的化学成分
Table 1. Chemical compositions of main raw materials
% 化学组分 Na2O MgO Al2O3 SiO2 SO3 Fe2O3 K2O CaO TiO2 Loss 粉煤灰 0.39 0.85 28.39 53.71 0.87 5.68 2.71 5.10 1.54 0.76 矿粉 0.22 5.59 13.11 32.59 0.64 0.70 0.31 45.64 0.64 0.56 
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表 2 粉煤灰基3D打印地聚合物配合比设计
Table 2. Mix proportions of fly ash based geopolymer for 3D printing
g 粉煤灰 矿粉 水 碱激发剂 石英砂 硅酸镁铝 450.0 50.0 150.0 50.0 750.0 5.0
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