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Assessment of asymmetrical rheological behavior of cementitious material for 3D printing application
Cement and Concrete Research ( IF 11.4 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.cemconres.2020.106305 Yohan Jacquet , Arnaud Perrot , Vincent Picandet
Cement and Concrete Research ( IF 11.4 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.cemconres.2020.106305 Yohan Jacquet , Arnaud Perrot , Vincent Picandet
Abstract Among the multiplicity of construction methods based on digital concrete technologies, the most common one remains the extrusion-based process. Two opposed strategies have been developed in order to print a concrete structure using extrusion: the first one emphasizes the ease-of-pumping of material which is massively accelerated to ensure the stability of the structure, when leaving the extruder; the second one uses a firm mortar able to sustain the own weight of the structure during the printing, without requiring any accelerator. Both methods have their pros and cons and don't imply the same rheological requirements. Most of the recent literature assumes that both types of material (fluid and firm) follow the same trend of behavior and obey to the Von Mises plasticity criterion, while it has been demonstrated that firm cement-based materials can exhibit a pressure dependent behavior. Moreover, rheological study is mainly based on shear rheometry, while the extrusion-based printing process requires a description of the rheological behavior in compression to predict the global stability of the structure, and in tension to prevent cracks formation. This paper investigates the fresh behavior of cement paste and mortar under different solicitations (shear, compression, tension) for different water to cement ratios. The analysis of these results allows to describe the transition between a ductile fluid material (symmetrical in tension and compression) that obeys to a Von Mises plasticity criterion, and a brittle and firm material (asymmetrical in tension and compression) that requires a pressure dependent plasticity criterion in order to predict its strength under a given solicitation.
中文翻译:
用于 3D 打印应用的胶结材料的不对称流变行为评估
摘要 在基于数字混凝土技术的多种施工方法中,最常见的一种仍然是基于挤压的工艺。为了使用挤出来打印混凝土结构,已经开发了两种相反的策略:第一种强调材料的易于泵送,当离开挤出机时,材料被大量加速以确保结构的稳定性;第二个使用坚固的砂浆,能够在打印过程中承受结构的自身重量,不需要任何加速器。这两种方法各有利弊,并不意味着相同的流变要求。大多数最近的文献都假设两种类型的材料(流体和坚固的)都遵循相同的行为趋势并遵守 Von Mises 塑性标准,虽然已经证明坚固的水泥基材料可以表现出与压力有关的行为。此外,流变学研究主要基于剪切流变学,而基于挤出的打印过程需要描述压缩流变行为以预测结构的整体稳定性,并在拉伸流变行为以防止裂缝形成。本文研究了水泥浆体和砂浆在不同要求(剪切、压缩、拉伸)下不同水灰比的新鲜行为。对这些结果的分析允许描述服从 Von Mises 塑性准则的延展性流体材料(拉伸和压缩对称)之间的过渡,
更新日期:2021-02-01
中文翻译:
用于 3D 打印应用的胶结材料的不对称流变行为评估
摘要 在基于数字混凝土技术的多种施工方法中,最常见的一种仍然是基于挤压的工艺。为了使用挤出来打印混凝土结构,已经开发了两种相反的策略:第一种强调材料的易于泵送,当离开挤出机时,材料被大量加速以确保结构的稳定性;第二个使用坚固的砂浆,能够在打印过程中承受结构的自身重量,不需要任何加速器。这两种方法各有利弊,并不意味着相同的流变要求。大多数最近的文献都假设两种类型的材料(流体和坚固的)都遵循相同的行为趋势并遵守 Von Mises 塑性标准,虽然已经证明坚固的水泥基材料可以表现出与压力有关的行为。此外,流变学研究主要基于剪切流变学,而基于挤出的打印过程需要描述压缩流变行为以预测结构的整体稳定性,并在拉伸流变行为以防止裂缝形成。本文研究了水泥浆体和砂浆在不同要求(剪切、压缩、拉伸)下不同水灰比的新鲜行为。对这些结果的分析允许描述服从 Von Mises 塑性准则的延展性流体材料(拉伸和压缩对称)之间的过渡,