不同无机增稠剂对3D打印水泥基材料性能的影响

Effects of Different Inorganic Thickeners on Properties of 3D Printed Cement-Based Materials

3D打印水泥基材料的工作性能是影响其最终状态的决定性因素,现有技术多采用有机增稠剂调节其工作性能,但存在强度下降、成本较高等问题。本文选用凹凸棒土、硅藻土和钠基膨润土三种无机增稠剂,研究了在不同增稠剂掺量下3D打印水泥基材料的工作性能和力学性能。结果表明,3D打印水泥基材料的工作性能会随着无机增稠剂掺量的增加而改善,凹凸棒土和硅藻土最佳掺量为2.5%(质量分数),钠基膨润土最佳掺量为1.0%(质量分数),其中钠基膨润土的改善效果最好。不同无机增稠剂对3D打印水泥基材料的力学性能会产生不同的影响,高掺量(2.5%)的凹凸棒土对3D打印水泥基材料的强度无不利影响,硅藻土能增强3D打印水泥基材料的后期强度,少量钠基膨润土就能显著提高3D打印水泥基材料的整体强度。掺1.0%钠基膨润土的3D打印水泥基材料具有最优的综合性能。

The working performance of 3D printed cement-based materials is a decisive factor affecting their final state.The existing technology mostly uses organic thickeners to regulate its working performance,but there are problems such as reduced strength and high cost.This article selected three inorganic thickeners,namely attapulgite,diatomaceous earth,and sodium based bentonite,to study and compare the working performance and mechanical properties of 3D printed cement-based materials under different thickener dosages.The results show that the working performance of 3D printed cement-based materials improves with the increase of inorganic thickener dosage.The optimal dosage of attapulgite and diatomaceous earth is 2.5%(mass fraction),and the optimal dosage of sodium based bentonite is 1.0%(mass fraction).Among them,sodium based bentonite has the best improvement effect.Different inorganic thickeners also have different effects on the mechanical properties of 3D printed cement-based materials.High dosage of attapulgite has no adverse effect on the strength of 3D printed cement-based materials,diatomaceous earth can enhance the later strength of 3D printed cement-based materials,a small amount of sodium based bentonite can significantly improve the overall strength of 3D printed cement-based materials.The 3D printed cement-based material mixed with 1.0%sodium based bentonite has the best comprehensive performance.