structure destruction
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Author(s):  
Г. С. Славчева ◽  
Е. А. Бритвина ◽  
М. А. Шведова

Постановка задачи. Рассмотрение закономерностей влияния вида цемента и модификаторов вязкости на технологические свойства смесей для 3D-печати определяется необходимостью одновременного обеспечения показателей пластичности и формоустойчивости смесей и декоративности композитов на их основе. Результаты. Представлены результтаты экспериментальных исследований основных реологических характеристик декоративного бетона для строительной 3D-печати. Выявлено влияние состава бетона на подвижность и формоустойчивость смеси. Установлено, что вид используемого цемента изменяет пластичность смеси и формоустойчивость под весом вышележащих слоев. Смеси с оптимальным компонентным составом декоративного бетона для строительной 3D-печати имеют следующие реологические характеристики: предел текучести K @ 1,0-2,2 кПа, структурная прочность s = 1,5-4,5 кПа, относительные пластические деформации Δ = 0,03-0,07 мм/мм. Данные характеристики определяют способность смеси к пластическому деформированию без разрушения структуры при течении, а также способность сохранять форму при печати слоя и нагружении вышележащими слоями. Выводы. Оптимальные диапазоны свойств смесей для 3D-печати могут быть изменены в 2-3 раза за счет использования цементов с различным гранулометрическим составом. Регулирование подвижности и формоустойчивости смесей с различными видами цемента главным образом обеспечивается применяемым модификатором вязкости. Statement of the problem. This paper present the rheological properties of 3D-printable decorative concrete. The effects of the mix proportion on its plasticity and shape stability are presented together. It has been established that a kind of cement changes the plasticity of fresh mixtures and its resistance to load during printing. Results. The fresh mixtures of 3D-printable decorative concrete with effective mix design had plastic yield value K @ 1.0-2.2 kPa, structural strength s = 1.5-4.5 kPa, value of plastic deformations Δ = 0.03-0.07 mm/mm. That has defined the ability of these mixes to plastically deform without any structure destruction and hold its shape, resist the deformation under compressions load during multi-layer casting. Conclusions. Shape stability of 3D-printable mix can be changed by 2-3 times by using cement with an efficient ranging of a particle size. The plasticity and shape stability of fresh mixes can be regulated using viscosity modifiers whose type depends on the type of cement.


Author(s):  
G. S. Slavcheva ◽  
E. A. Britvina ◽  
M. A. Shvedova

Statement of the problem. This paper present the rheological properties of 3D-printable decorative concrete. The effects of mix proportion on its plasticity and shape stability are presented together. It has been established that kind of cement changes plasticity of fresh mixtures and its resistance to load during the printing. Results. The fresh mixtures of 3D-printable decorative concrete with effective mix design had plastic yield value Ki 1.0 - 2.2 kPa, structural strength σ0 = 1.5 - 4.5 kPa, value of plastic deformations Δpl = 0.03 - 0.07 mm/mm. That is defined the ability of these mixtures to plastically deform without structure destruction and hold its shape, resist the deformation under compressions load during multi-layer casting.Conclusions. Shape stability of 3D-printable mixture can be changed by 2--3 times by using cement with efficient ranging of a particle size. The plasticity and shape stability of fresh mixtures can be regulated with usage of viscosity modifiers, the type of which depends on the type of cement.


Author(s):  
Ke-Yue Zhang ◽  
Taiping Yao ◽  
Jian Zhang ◽  
Shice Liu ◽  
Bangjie Yin ◽  
...  

CrystEngComm ◽  
2021 ◽  
Author(s):  
Bo Fu ◽  
Gaohang He ◽  
Wenxiang Mu ◽  
Yang Li ◽  
Boyuan Feng ◽  
...  

We designed an original and effective method to study the laser damage mechanism of β-Ga2O3 single crystal grown by edge-defined film-fed growth (EFG). The structure destruction under high light field...


Materials ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 2988 ◽  
Author(s):  
Dominik Logoń ◽  
Krzysztof Schabowicz

This paper presents the recognition of micro-events and their concentration in quasi-brittle cement composites and the identification of the destruction process based on acoustic emission and sound spectrum. The tests were conducted on a quasi-brittle composite of a cement paste reinforced with a high volume of dispersed polypropylene fibers. The possibility of identifying the destruction process based on acoustic emission and sound spectrum was confirmed. This paper focused on the identification of micro-events using the 3D spectrum. It was shown that the identification of the concentration of micro-events precedes the occurrence of critical crack fcr, ending the Hooke’s law range. The ability to recognize this phenomenon with the use of the 3D spectrum makes it possible to predict the structure destruction process and subsequently to assess the structure destruction (micro and macro-cracks) and the reinforcement destruction (pull-off, breaking). It was confirmed that the three-dimensional spectrum provided additional information, enabling a better recognition of micro and macro-changes in the structure of the samples based on the analysis of sound intensity, amplitudes, and frequencies.


2019 ◽  
Vol 55 (87) ◽  
pp. 13128-13131 ◽  
Author(s):  
Yang Li ◽  
Shujuan Wang ◽  
Yulan Huang ◽  
Yuwen Chen ◽  
Wenbi Wu ◽  
...  

Multiple thioether-inserted lipophilic prodrugs co-assembled into FRET nanoaggregates for light-activated drug release by structure destruction.


2017 ◽  
Vol 16 (2) ◽  
pp. 141-151
Author(s):  
Anna Alberska ◽  
Przemysław Brzyski

Proper design of the building component, which not only meets the legal requirements, but also provides comfort of using of buildings, requires knowledge of the materials and solutions. Since moisture is one of the main factors that can affect the building structure destruction, it is particularly important to be aware of hygrothermal properties of components. And this is the focus of the study. In this paper several variants of external walls were analysed, according to the requirements in terms of: heat transfer coefficient U, the risk of surface and interstitial condensation. Partitions were designed with composite based on shives from industrial hemp and lime binder, which is not yet widely used in Poland. The purpose of the analysis of this material was to prove the validity of using the natural materials in residential buildings.


Author(s):  
WALTER S. WEHNER ◽  
FRANK Y. SHIH

We present a self-directed method for image segmentation using a modified top-down region dividing (TDRD) approach. The TDRD-based image segmentation method solves some of the issues with histogram and region growing-based segmentation techniques. The process is efficient and achieves proper results without over segmentation or spatial-structure destruction. In this paper, we examine seven user-defined parameters of the method. These parameters are converted from human inputs to values derived from in-class information created by the algorithm allowing for autonomous image segmentation, without the need of human input or feedback. Our new autonomous implementation also reduces the computational complexity of the algorithm. This reduction will produce significant savings for the total number of computations the algorithm needs to perform image segmentation. Experimental results show that the images using these new derived values yield superior results as compared to other methods, including the original TDRD method. We compare our results visually and numerically based on the within-class standard deviation (WCSD) and the number of connected components (NCC).


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