石粉对3D打印白水泥基材料流变性能与力学性能的影响

Effect of stone powder on rheological and mechanical properties of 3D-printed white cement-based materials

3D打印水泥基材料的结构不稳定性和难于调控的流变性能制约其在建筑材料领域的发展。本文通过使用0~3%石粉取代胶凝材料调控3D打印白水泥基材料的流变性能来改善其3D结构和力学性能。研究发现:石粉的掺入会提高3D打印白水泥基材料的静态和动态屈服应力,同时使得其线性粘弹区范围增大,并显著提高浆体的弹性模量,3D打印白水泥基材料的变形率由17%降至8%。此外,随着石粉掺量由0提高至3%,抗压强度从35.2MPa增长到43.7MPa。本文为水泥基装饰材料三维结构的构建提供了一个新的方向,表明石粉的利用在3D打印白水泥基材料方面的应用具有巨大潜力。

The structural instability and uncontrollable rheology of 3D-printed cement-based materials limit its development in the field of building materials.In this paper,0~3%of stone powder instead of cementitious material is used to improve the 3D structure and mechanical properties of 3D-printed white cement-based materials by controlling the rheological properties.Experimental results show that the addition of stone powder increases the static and dynamic yield stress of 3D-printed white cement-based materials,the range of linear viscoelastic region and the elastic modulus of the paste significantly.And the structure deformation of 3D-printed white cement-based materials decreases from 17%to 8%.In addition,with the content of stone powder increased from 0 to 3%,the compressive strength increases from 35.2 MPa to 43.7 MPa.In conclusion,this paper provides a new research direction for 3D structure build-up of cement-based decorative materials,and the application of stone powder presents great potential in 3D-printed white cement-based materials.