Purpose

Recent advances in 3D printing construction elements have focused on ordinary Portland cement (OPC) concrete using polymeric binders; herein, this study aims to produce the same using pure water.

Design/methodology/approach

A binder jet printer prototype was used to fabricate specimens that are used to assess geometric and mechanical properties. Two distinct water-based binder formulations, compatible with OPC chemistry and piezoelectric jetting device, were used: pure water and water-polyvinyl alcohol (98:2 w/w) solution.

Findings

This study examines the effect of binder flow rate on dimensional accuracy. Furthermore, the changes in the mechanical properties over time with hydration have been investigated.

Practical implications

Results indicate that the increase in mechanical strength of Portland cement concrete with pure water was consistent; however, it was delayed by the water: PVA (98:2 w/w) solution. Post-curing by water vapor hardened the structure with the removal of layering native to 3DP and decreased infilling porosity by diffusion mechanism.

Originality/value

This paper has used pure water jetting for BJT of Portland cement-containing bodies.

中文翻译：

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含波特兰水泥的主体的 3D 打印

目的

3D 打印建筑元件的最新进展主要集中在使用聚合物粘合剂的普通波特兰水泥 (OPC) 混凝土上；在此，本研究旨在使用纯水生产同样的产品。

设计/方法/方法

粘合剂喷射打印机原型用于制造用于评估几何和机械性能的样品。使用了两种不同的水基粘合剂配方，与 OPC 化学和压电喷射装置兼容：纯水和水-聚乙烯醇 (98:2 w/w) 溶液。

发现

本研究考察了粘合剂流速对尺寸精度的影响。此外，还研究了机械性能随水合时间的变化。

实际影响

结果表明，纯水对硅酸盐水泥混凝土机械强度的提高是一致的；但是，它被水延迟了：PVA（98:2 w/w）溶液。水蒸气后固化使结构硬化，去除了 3DP 固有的分层，并通过扩散机制降低了填充孔隙率。

原创性/价值

本文采用纯水射流对含波特兰水泥的物体进行 BJT。