Surface treatment of 3DPC interlayers with silicate-based solution for enhanced interfacial bonding

IF 13.1 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2025-05-26 DOI:10.1016/j.cemconres.2025.107948

Rue Munemo, Jacques Kruger, Gideon P.A.G. van Zijl

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引用次数: 0

Abstract

The unavoidable challenge of weakened interlayers in 3D Concrete Printing yields diminished mechanical performance due to compromised micro- and macrostructural properties that are a culmination of the material and process parameters, in conjunction with ambient environmental conditions. A bond enhancement technique is proposed that is characterised by the surface treatment of interlayer surfaces with a silicate-based solution with the intention of densifying and improving the cementitious matrix in the interlayer region. After applying the surface treatment, the mechanical properties were assessed through compression and direct tensile tests. For microstructural characterisation, SEM/EDS analysis was performed to quantify the hydration products and their morphology in tandem with XCT analysis to assess the pore structure of the interlayer region. The surface treatment technique strengthened the interfaces, yielding up to 126 % bond strength improvement. Furthermore, the interlayer region is densified, with a marked decrease in total pore volume, as well as largest pore size observed. Moreover, the pore structure is more homogenous after the application of surface treatment.

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用硅酸盐基溶液对3DPC中间层进行表面处理以增强界面粘合

在3D混凝土打印中，由于材料和工艺参数以及环境条件的影响，导致微观和宏观结构性能受损，导致夹层弱化的机械性能下降，这是不可避免的挑战。提出了一种键增强技术，其特点是用硅酸盐基溶液对层间表面进行表面处理，目的是致密化和改善层间区域的胶凝基质。在进行表面处理后，通过压缩和直接拉伸试验来评估其力学性能。在微观结构表征方面，通过SEM/EDS分析量化水化产物及其形态，并结合XCT分析评估层间区域的孔隙结构。表面处理技术强化了界面，使结合强度提高了126%。层间区域致密化，总孔隙体积明显减小，孔隙尺寸最大。此外，表面处理后的孔隙结构更加均匀。

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来源期刊

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.