摘要
以水泥、矿物超细粉、减水剂、速凝剂等为原料制备了3D打印建筑砂浆,同时针对3D打印建筑砂浆分析了减水剂、缓凝剂等化学外加剂于不同剪切速率下对其性能的影响。结果表明,3D打印建筑砂浆降低了不能振捣夯实材料所造成的收缩变形,且凝结时间可控,可挤出性能与力学性能较好;随着减水剂掺量增加,3D打印建筑砂浆材料的表观黏度并未发生显著变化,触变性能呈现先降低并逐步趋向不变化的状态,塑性黏度表征为先下降后上升的趋势,屈服应力则保持持续降低的形态;随着缓凝剂掺量的增加,3D打印建筑砂浆材料的表观黏度呈现递增状态,触变性能变化并不明显,塑性黏度表现为先上升后下降的趋势,屈服应力则表征为递增形态。
The 3D printing building mortar was prepared with cement,mineral superfine powder,water reducing agent and accelerator as raw materials.Meanwhile,the influence of water reducing agent and retarder on the performance of 3D printing building mortar under different shear rates was analyzed.The results show that 3D printing construction mortar reduces the shrinkage deformation caused by the materials that can not be vibrated and compacted,and the setting time is controllable,so the extrudability and mechanical properties are better;with the increase of water reducing agent,the apparent viscosity of 3D printing construction mortar does not change significantly,and the thixotropic performance first decreases and gradually tends to remain unchanged,and the plastic viscosity first decreases With the increase of the amount of retarder,the apparent viscosity of the 3D printing building mortar material shows an increasing state,the thixotropic property change is not obvious,the plastic viscosity shows a trend of first rising and then declining,and the yield stress is characterized as an increasing form.
作者
李艳玲
LI Yanling(Shaanxi Polytechnic Institute,Xianyang 712000,China)
出处
《工业加热》
CAS
2021年第7期47-49,53,共4页
Industrial Heating
关键词
化学外加剂
3D打印
建筑砂浆
表观黏度
减水剂
chemical admixture
3D printing
building mortar
apparent viscosity
water reducer
