Early age shrinkage mitigation and quantitative study on water loss kinetics of 3D printed foam concrete modified with superabsorbent polymers

IF 10.3 1区工程技术 Q1 ENGINEERING, MANUFACTURING

Additive manufacturing Pub Date : 2024-08-25 DOI:10.1016/j.addma.2024.104448

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引用次数: 0

Abstract

Due to direct exposure to the environment during the printing process and after printing and its own porous characteristics, 3D printed foam concrete (3DPFC) will inevitably have a large shrinkage at early age. In this study, the early age shrinkage of 3DPFC was modified by using various dosages of superabsorbent polymer (SAP). The water loss kinetics of 3DPFC at early age were elucidated, and the mechanism influencing early age shrinkage of 3DPFC was revealed. The 8-hour total shrinkage of 3DPFC with two foam contents was reduced by 23.1% and 24.3% at most, respectively. Based on low-field nuclear magnetic transverse relaxation time, liquids in bubble liquid film, capillary pores of the matrix, and inside SAP were quantified and tracked in real time. Under exposure conditions, there exists a quantitative relationship between internal water loss variations in 3DPFC and the matrix T₂₁ peak water (water adsorbed by binder particles and small capillary water between particles), bubble volume fraction, and surface tension of the matrix pore solution. The early age shrinkage of 3DPFC is indeed influenced by the combined effect of water loss and bubble volume fraction.

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用超吸收聚合物改性的 3D 打印泡沫混凝土的早期龄期收缩缓解和失水动力学定量研究

由于三维打印泡沫混凝土（3DPFC）在打印过程中和打印后直接暴露在环境中，加上其自身多孔的特点，在早期龄期不可避免地会产生较大的收缩。本研究通过使用不同剂量的超吸收聚合物（SAP）来改变 3DPFC 的龄期收缩。阐明了 3DPFC 早期失水动力学，并揭示了影响 3DPFC 早期收缩的机制。两种泡沫含量的 3DPFC 8 小时总收缩率最多分别降低了 23.1%和 24.3%。基于低场核磁横向弛豫时间，对气泡液膜、基质毛细孔和 SAP 内部的液体进行了量化和实时跟踪。在暴露条件下，3DPFC 内部失水变化与基质 T21 峰值水（粘合剂颗粒吸附的水和颗粒间的小毛细管水）、气泡体积分数和基质孔隙溶液表面张力之间存在定量关系。3DPFC 的早期龄期收缩确实受到失水和气泡体积分数的综合影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Additive manufacturing Materials Science-General Materials Science

CiteScore

19.80

自引率

12.70%

发文量

648

审稿时长

35 days

期刊介绍： Additive Manufacturing stands as a peer-reviewed journal dedicated to delivering high-quality research papers and reviews in the field of additive manufacturing, serving both academia and industry leaders. The journal's objective is to recognize the innovative essence of additive manufacturing and its diverse applications, providing a comprehensive overview of current developments and future prospects. The transformative potential of additive manufacturing technologies in product design and manufacturing is poised to disrupt traditional approaches. In response to this paradigm shift, a distinctive and comprehensive publication outlet was essential. Additive Manufacturing fulfills this need, offering a platform for engineers, materials scientists, and practitioners across academia and various industries to document and share innovations in these evolving technologies.