Characteristics of solid-waste-based sulfoaluminate cementitious material being used in 3D printing and process simulation

doi:10.11949/j.issn.0438-1157.20171555

Abstract

Abstract:

To obtain high performance, low cost and extend technology application, industrial solid wastes were used to prepare sulfoaluminate cementitious material (SCM), which was then processed into three-dimensional (3D) printing materials by using a suitable accelerator and retarder. Multidiscipline coupled-field analysis was used to determine the influence of slurry velocity and the quality that results from different water-cement ratios with the same nozzle diameter. It was proved that the SCM prepared from industrial solid wastes could meet the national standard GB-2007-R525. After improving their properties, the SCMs exhibit advantages of a controlled setting time of between 10 and 30 min, a rapid hardening and an early stable strength. The hydrated-specimen compressive strength reached 15-20 MPa after 2 h of curing. When the water-cement ratio of the 3D printing-material slurry exceeded 0.6, stacking and collapse phenomena might be resulted. When the water-cement ratio was below 0.4, the jetted slurry showed tailing phenomena that could affect the printing speed. A water-cement ratio of~0.5 with its corresponding nozzle size was most suitable for 3D printing applications.

Key words: waste treatment, sulfoaluminate, 3D printing material, slurry viscosity, numerical analysis

摘要：

为了解决建筑3D打印材料的性能、成本及技术应用等问题，通过以工业固体废弃物为原料制备了硫铝酸盐胶凝基质材料，配以促凝剂、缓凝剂等形成的建筑3D打印粉体，并应用多物理场耦合软件对同一喷嘴结构不同水灰比（W/C）下喷出浆体速度及质量的影响规律进行仿真计算。结果表明：以工业固体废弃物为原料能成功制备达到GB-2007-R525的硫铝酸盐胶凝材料，且经过外加剂改性后凝结时间可控制在10～30 min，2 h抗压强度15～20 MPa，后期强度稳定；水灰比高于0.6，打印浆体出现堆叠、坍塌的现象，影响打印精度及打印构件质量；水灰比低于0.4，喷射浆体会出现拖尾，影响打印速度，最终确定水灰比在0.5附近较适合相应尺寸喷嘴的3D打印应用。

关键词: 废物处理, 硫铝酸盐, 3D打印材料, 浆料黏度, 数值分析

CLC Number:

TB34

REN Changzai, WANG Wenlong, LI Guolin, WANG Biao. Characteristics of solid-waste-based sulfoaluminate cementitious material being used in 3D printing and process simulation[J]. CIESC Journal, 2018, 69(7): 3270-3278.

任常在, 王文龙, 李国麟, 王彪. 固废基硫铝酸盐胶凝材料用于建筑3D打印的特性与过程仿真[J]. 化工学报, 2018, 69(7): 3270-3278.

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