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Influence of Recycled Glass on Strength Development of Alkali-Activated High-Calcium Fly Ash Mortar

Advances in Materials Science and engineering 2023年第1期2023卷

作者： Damrongwiriyanupap, Nattapong Wongchairattana, Sangsan Phoo-Ngernkham, Tanakorn Petcherdchoo, Aruz Limkatanyu, Suchart Chindaprasirt, Prinya Civil Engineering Program School of Engineering University of Phayao Mae Ka Phayao56000 Thailand Sustainable Construction Material Technology Research Unit Department of Civil Engineering Faculty of Engineering and Technology Rajamangala University of Technology Isan Nakhon Ratchasima30000 Thailand Department of Civil Engineering Faculty of Engineering King Mongkut's University of Technology North Bangkok Bangkok10800 Thailand Department of Civil Engineering Faculty of Engineering Prince of Songkla University Hat Yai Songkla90112 Thailand Sustainable Infrastructure Research and Development Center Department of Civil Engineering Faculty of Engineering Khon Kaen University Khon Kaen40002 Thailand Academy of Science The Royal Society of Thailand Dusit Bangkok10300 Thailand

This article presents the development of green and sustainable mortars using alkali-activated high-calcium fly ash (AAFA) and recycled glass (RG) as part of the fine aggregate. RG was used to replace river sand at dosages of 0%, 25%, 50%, 75%, and 100% by weight. Sodium hydroxide (SH) and sodium silicate (SS) solutions were used as liquid alkaline activators in all mixtures. The AAFA samples were prepared with different liquid-to-binder ratios of 0.6 and 0.7, and the ratio of SS-to-SH was fixed at 2.0. Compressive and flexural strengths were determined at the ages of 7, 28, and 60 days. Test results showed that the compressive and flexural strengths of AAFA mortars declined as RG replacement increased;nevertheless, they increased with curing time. The high Na2O concentration derived from RG and the weak interfacial transition zone of RG are reasons for the decrease in strength development. The optimum percentage replacement of fine aggregates with RG was found at 25%. The 28-day compressive strength of AAFA with 25% RG was 32.5 MPa for L/B ratios of 0.6 and 29.5 MPa for L/B ratios of 0.7, which resulted in a strength index higher than 75% while releasing low CO2. © 2023 Nattapong Damrongwiriyanupap et al.

关键词： Mortar

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A Topography-Based and Vectorized Interpretation Algorithm for Fluid Dynamics in Discretized 3d-Sph Form: The Application of Debris-Flow Entrainment Process Modeling

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SSRN 2024年

作者： Bin, Su Yange, Li Zheng, Han Yangfan, Ma Weidong, Wang Bo, Ruan Wei, Guo Wendu, Xie Shaofeng, Tan School of Civil Engineering Central South University No.22 Shaoshan South Road Changsha410075 China Graduate School of Civil Engineering Kyushu University Fukuoka819-0395 Japan The Key Laboratory of Engineering Structures of Heavy Haul Railway Ministry of Education Changsha410075 China National Engineering Research Center of High-Speed Railway Construction Technology Central South University Changsha410075 China

Interpretation of the fluid dynamics, e.g., flow depth and velocities, is one of the major purposes of geophysical flow numerical modelling and critical for estimating consequent impact forces and potential sediment entrainment process. It is simple in nature for mesh-based continuous models but presenting challenges in three-dimensional discretized smoothed particle hydrodynamics (SPH) schemes. The difficulties lay on the substantial quantity of particles and their uneven spatial-temporal varying distribution, in particular over the complex topography. In this paper, inspired by our previous surface cell (SC) -based approach, we proposed a novel topography-based and vectorized algorithm which significantly enhances the ability in dealing with fluid dynamics interpretation over complex topography. In the proposed algorithm, the geomorphologic characteristics is mathematically represented by the topographical normal vectors. The correlations of fluid dynamics with the distinct coordinate descriptions could be established by the vectorization concept, which ultimately leads to effective interpretation of fluid dynamics in SPH form over complex topography. To show the effectiveness of the proposed algorithm, the sediment entrainment process, which has been substantiated highly depend on the flow velocity and flow depth of overriding debris flow is used for demonstration, and the 2010 Yohutagawa debris-flow event in Japan is selected as a case study. Debris flow process is simulated by our previous HBP-SPH model, and flow dynamics are adequately interpreted by the proposed algorithm to estimate the sediment entrainment. The results demonstrate a strong agreement between the numerical simulation and on-site observation. © 2024, The Authors. All rights reserved.

关键词： Flow velocity

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Pivotal role of snow depth, local atmospheric conditions, and large-scale climate signals on ice thinning in Finnish lakes

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Science of the Total Environment 2025年 966卷 178715页

作者： Naderian, Danial Noori, Roohollah Bateni, Sayed M. Jun, Changhyun Kim, Dongkyun Shahmohammad, Mohsen Alizadeh, Farzaneh Kianmehr, Peiman Woolway, R. Iestyn Graduate Faculty of Environment University of Tehran Tehran*** Iran Department of Civil Environmental and Construction Engineering Water Resources Research Center University of Hawaii at Manoa HonoluluHI96822 United States UNESCO-UNISA Africa Chair in Nanoscience and Nanotechnology College of Graduate Studies University of South Africa Muckleneuk Ridge Pretoria392 South Africa School of Civil Environmental and Architectural Engineering College of Engineering Korea University Seoul02841 Korea Republic of Department of Civil and Environmental Engineering Hongik University Seoul04066 Korea Republic of School of Planning Design & Construction Michigan State University 552 W. Circle Dr East LansingMI48824 United States Department of Civil Engineering American University in Dubai Dubai United Arab Emirates School of Ocean Sciences Bangor University Menai Bridge AngleseyLL59 5AB United Kingdom

Lake ice thickness is a critical indicator of climate change, with profound implications for aquatic ecosystems. Despite its importance, our understanding of changes in lake ice thickness is relatively limited. Additionally, the influence of snow depth on ice thickness at a regional scale is not well understood, primarily due to the lack of long-term, high-resolution in-situ data. In this study, we leveraged in-situ data from 35 stations across 32 deep Finnish lakes, collected from 1995 to 2023, to investigate and simulate changes in maximum ice thickness using traditional statistical tools and artificial intelligent models. Our results indicate a decrease in maximum ice thickness at nearly all (34 out of 35) studied sites, with an average annual decrease of ∼3.4 mm/yr. The rate of decline was slower in lakes situated at higher latitude and at higher elevation. In the southern lakes of Finland, local atmospheric conditions were more effective in explaining the variance in ice thickness. However, at higher latitudes, the influence of these local factors decreased. Winter air temperature and snow depth were identified as the main drivers of maximum ice thickness. Snow depth was positively correlated with ice thickness (R = 0.63), largely due to its insulating effect, which supports faster ice growth in deeper lakes. Among the large-scale climate signals tested, the North Atlantic Oscillation and Scandinavia Pattern, as well as global CO2 concentrations, were key drivers of the developed ice thickness models. Our findings suggest that readily accessible large-scale climate signals can be used to inform modelling efforts of lake ice thickness. © 2025 Elsevier B.V.

关键词： Ice

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Acid-catalyzed hydrothermal treatment of sewage sludge: effects of reaction temperature and acid concentration on the production of hydrolysis by-products

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Biomass Conversion and Biorefinery 2023年第9期13卷 7533-7546页

作者： Pham, Van Toi Guan, Chung-Yu Han, Po-Chun Matsagar, Babasaheb M. Wu, Kevin C. W. Ahamad, Tansir Chang, Ching-Yuan Yu, Chang-Ping Graduate Institute of Environmental Engineering National Taiwan University Taipei106 Taiwan Faculty of Environmental Engineering National University of Civil Engineering 55 Giai Phong Hai Ba Trung Hanoi100000 Viet Nam Department of Environmental Engineering National Ilan University Yilan260 Taiwan Ph.D. Program of Green Materials and Precision Devices National Taiwan University Taipei10617 Taiwan Department of Chemical Engineering National Taiwan University No. 1 Sec. 4 Roosevelt Road Taipei10617 Taiwan Department of Chemistry College of Science King Saud University P.O. Box 2455 Riyadh11451 Saudi Arabia Water Innovation Low Carbon and Environmental Sustainability Research Center National Taiwan University Taipei106 Taiwan

Sewage sludge (SS) is an organic biomass from wastewater treatment plants, but the use of SS to produce bio-based chemicals under acid-catalyzed hydrolysis (ACH) processes is not well investigated. In this study, ACH processes were performed at 120, 150, and 180 °C using sulfuric acid (H2SO4) with concentrations of 0–0.5 M within a reaction time of 90–180 min to produce bio-based chemicals from SS. The results showed that the reaction temperature, reaction time, and concentrations of H2SO4 affected the yields of sugars, levulinic acid (LA), and 5-hydroxymethylfurfural (HMF). The highest xylose and glucose yields were 7.69 mol% and 5.22 mol% at 120 °C with 0.5 M H2SO4 during the 180 min of reaction time, respectively. Besides, under the ACH process at 180 °C and 180 min, the yield of LA reached a maximum value of 0.48 mol% at 0.5 M H2SO4, and the highest yield of HMF was 1.66 mol% at 0.1 M H2SO4. The data obtained also indicated that the ACH process led to an increase in soluble chemical oxygen demand, dissolved organic carbon, and total dissolved nitrogen. Fluorescence excitation-emission matrix of dissolved organic matter and thermogravimetric analysis of the treated SS further supported the enhanced solubilization of SS after ACH process, especially under higher reaction temperature and concentrations of H2SO4. Although the lower yields of bio-based chemicals might restrict the downstream recovery of the target products, the largely improved SS solubilization by ACH suggests that acid-catalyzed hydrothermal hydrolysis process has potential as an alternative pretreatment method of SS. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

关键词： Sewage sludge

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Interaction between Nanofibrillated Cellulose (Nfc) and Portland Cement Mortars Subjected to Alkali-Aggregate Reaction (Aar)

SSRN

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SSRN 2024年

作者： Farias, Marcelo Miranda Pereira, Eduardo de Melo Carvalho, Benjamim Goncalves, Jose de Medeiros, Marcelo Henrique Farias Graduate Program in Materials Science and Engineering State University of Ponta Grossa Avenida Carlos Cavalcanti 4748 Uvaranas Ponta GrossaCEP: 84030-900 Brazil Department of Civil and Environmental Engineering The University of Alberta EdmontonABT6G 1H9 Canada Department of Civil Construction – Polytechnical Center Paraná CuritibaCEP: 81.530-000 Brazil

HIGHLIGHTS• NFC can increase the compressive strength of cement pastes by up to 59%.• NFC degrades in the pore solution of mortars after 60 days of curing;• NFC degradation reduces the tensile strength of cement pastes and mortars;• NFC can mitigate the effects of alkali-aggregate reaction in mortars;• NFC fibers act as a "stress reserve" in expansive mechanisms caused by AAR. © 2024, The Authors. All rights reserved.

关键词： Mortar

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Evaluation of shear strength improvement of recycled concrete aggregate as a high-quality pavement material utilizing CO₂ carbonation treatment

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construction and Building Materials 2025年 489卷

作者： Buritatum, Apinun Horpibulsuk, Suksun Suddeepong, Apichat Yaowarat, Teerasak Hoy, Menglim Aiamsri, Krairerk Akkharawongwhatthana, Kongsak Arulrajah, Arul Undergraduate Program in Civil and Infrastructure Engineering Institute of Engineering Suranaree University of Technology Nakhon Ratchasima 30000 Thailand Center of Excellence in Innovation for Sustainable Infrastructure Development Suranaree University of Technology Nakhon Ratchasima 30000 Thailand Academy of Science The Royal Society of Thailand Bangkok Thailand Institute of Research and Development Suranaree University of Technology Nakhon Ratchasima 30000 Thailand Department of Civil and Construction Engineering Swinburne University of Technology Hawthorn Victoria 3122 Australia School of Civil Engineering Institute of Engineering Suranaree University of Technology Nakhon Ratchasima 30000 Thailand

This study investigates the performance enhancement of recycled concrete aggregate (RCA) through CO2 carbonation. RCA samples were treated with varying CO2 concentrations in the range of 20–60 % and curing durations ... 详细信息

This study investigates the performance enhancement of recycled concrete aggregate (RCA) through CO₂ carbonation. RCA samples were treated with varying CO₂ concentrations in the range of 20–60 % and curing durations (T) in the range of 24–72 h. A series of large-scale direct shear tests, combined with SEM and EDS analyses, were conducted to evaluate the mechanical and microstructural changes. The optimal carbonation condition was identified as 20 % CO₂ concentration with 72-hour curing, resulting in a 51.7 % increase in friction angle and a 13.0 % increase in cohesion. In contrast, higher CO₂ concentrations (40 % and 60 %) yielded reduced strength improvements, with 60 % CO₂ treatment exhibiting diminished effectiveness. Strength parameters increased rapidly within the first 24 h before plateauing with extended curing durations. SEM analysis revealed that the 20 % CO₂-treated RCA developed a dense and well-compacted microstructure, with CaCO₃ effectively filling pores and bridging microcracks, whereas the 60 % CO₂-treated sample exhibited excessive surface carbonation that restricted internal modification. EDS results supported these observations, showing minimal elemental intensities in untreated RCA, increased Ca and C levels in the 20 % CO₂-treated sample, and surface accumulation in the 60 % CO₂-treated sample with stable Si content. The 20 % CO₂-treated RCA achieved greater strength with lower dilatancy than the untreated RCA;however, both exhibited comparable residual strength, governed primarily by particle friction. A predictive polynomial model was developed to estimate the evolution of friction angle and cohesion across varying CO₂ concentrations and curing durations, and its accuracy was confirmed through validation using the 10 % CO₂-treated RCA sample, demonstrating its reliability for practical applications. © 2

关键词： CO2 carbonation Ground improvement Large-scale direct shear MSE walls Pavement geotechnics Recycled concrete aggregate Shear strength

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Long-term performance of the adsorption layer system for the recycling and repurposing of arsenic-bearing mudstone as road embankment

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Chemosphere 2024年 363卷 142985页

作者： Kajiyoshi, Mitsunori Yamamoto, Takahiro Arima, Takahiko Mufalo, Walubita Hashimoto, Ayaka Oumi, Takahiro Yamazaki, Shusaku Tabelin, Carlito Baltazar Igarashi, Toshifumi Course of Sustainable Resources Engineering School of Engineering Hokkaido University Sapporo060-8628 Japan Division of Sustainable Resources Engineering Graduate School of Engineering Hokkaido University Sapporo060-8628 Japan Division of Sustainable Resources Engineering Faculty of Engineering Hokkaido University Sapporo060-8628 Japan Asahikawa Development and Construction Department Hokkaido Regional Development Bureau Ministry of Land Infrastructure Transport and Tourism Sapporo078-8391 Japan Civil Engineering Research Institute for Cold Region Sapporo060-8602 Japan Department of Materials and Resources Engineering Technology Mindanao State University-Iligan Institute of Technology Iligan City9200 Philippines Resource Processing and Technology Center RIEIT Mindanao State University-Iligan Institute of Technology Iligan City9200 Philippines

The adsorption layer system has shown great potential as a cost-effective and practical strategy for the recycling and management of excavated rocks containing potentially toxic elements (PTEs). Although this system has been employed in various civil engineering projects throughout Japan, its long-term performance to immobilize PTEs has rarely been investigated. This study aims to evaluate the effectiveness of the adsorption layer system applied in an actual road embankment approximately 11 years after construction. The embankment system is comprised of a layer of excavated arsenic (As)-bearing mudstone built on top of a bottom adsorption layer mixed with an iron (Fe)-based adsorbent. Collection of undisturbed sample was carried out by implementing borehole drilling surveys on the embankment. Batch leaching experiments using deionized water and hydrochloric acid were conducted to evaluate the water-soluble and acid-leachable concentrations of As, Fe, and other coexisting ions. The leaching of As from the mudstone layer was likely induced by As desorption from Fe-oxides/oxyhydroxides naturally present under alkaline conditions, including the oxidation of framboidal pyrite, which was identified as a potential source of As. This was supported by electron probe microanalyzer (EPMA) observations showing the presence of trace amounts of As in framboidal pyrite crystals. Arsenic leached from the mudstone layer was then immobilized by Fe oxyhydroxides found in the adsorption layer. Based on geochemical modeling and X-ray photoelectron spectroscopy (XPS) results, leached As predominantly existed as the negatively charged HAsO42− oxyanion, which is readily sequestered by Fe oxyhydroxides. Moreover, the effectiveness of the adsorption layer was assessed and its lifetime was estimated, and the results revealed it still possessed enough capacity to adsorb As released from mudstone in the foreseeable future. This prediction utilized the maximum potential amount of As that could l

关键词： Cost effectiveness

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Technology Roadmap for Flexible Sensors

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ACS NANO 2023年第6期17卷 5211-5295页

作者： Luo, Yifei Abidian, Mohammad Reza Ahn, Jong-Hyun Akinwande, Deji Andrews, Anne M. Antonietti, Markus Bao, Zhenan Berggren, Magnus Berkey, Christopher A. Bettinger, Christopher John Chen, Jun Chen, Peng Cheng, Wenlong Cheng, Xu Choi, Seon-Jin Chortos, Alex Dagdeviren, Canan Dauskardt, Reinhold H. Di, Chong-an Dickey, Michael D. Duan, Xiangfeng Facchetti, Antonio Fan, Zhiyong Fang, Yin Feng, Jianyou Feng, Xue Gao, Huajian Gao, Wei Gong, Xiwen Guo, Chuan Fei Guo, Xiaojun Hartel, Martin C. He, Zihan Ho, John S. Hu, Youfan Huang, Qiyao Huang, Yu Huo, Fengwei Hussain, Muhammad M. Javey, Ali Jeong, Unyong Jiang, Chen Jiang, Xingyu Kang, Jiheong Karnaushenko, Daniil Khademhosseini, Ali Kim, Dae-Hyeong Kim, Il-Doo Kireev, Dmitry Kong, Lingxuan Lee, Chengkuo Lee, Nae-Eung Lee, Pooi See Lee, Tae-Woo Li, Fengyu Li, Jinxing Liang, Cuiyuan Lim, Chwee Teck Lin, Yuanjing Lipomi, Darren J. Liu, Jia Liu, Kai Liu, Nan Liu, Ren Liu, Yuxin Liu, Yuxuan Liu, Zhiyuan Liu, Zhuangjian Loh, Xian Jun Lu, Nanshu Lv, Zhisheng Magdassi, Shlomo Malliaras, George G. Matsuhisa, Naoji Nathan, Arokia Niu, Simiao Pan, Jieming Pang, Changhyun Pei, Qibing Peng, Huisheng Qi, Dianpeng Ren, Huaying Rogers, John A. Rowe, Aaron Schmidt, Oliver G. Sekitani, Tsuyoshi Seo, Dae-Gyo Shen, Guozhen Sheng, Xing Shi, Qiongfeng Someya, Takao Song, Yanlin Stavrinidou, Eleni Su, Meng Sun, Xuemei Takei, Kuniharu Tao, Xiao-Ming Tee, Benjamin C. K. Thean, Aaron Voon-Yew Trung, Tran Quang Wan, Changjin Wang, Huiliang Wang, Joseph Wang, Ming Wang, Sihong Wang, Ting Wang, Zhong Lin Weiss, Paul S. Wen, Hanqi Xu, Sheng Xu, Tailin Yan, Hongping Yan, Xuzhou Yang, Hui Yang, Le Yang, Shuaijian Yin, Lan Yu, Cunjiang Yu, Guihua Yu, Jing Yu, Shu-Hong Yu, Xinge Zamburg, Evgeny Zhang, Haixia Zhang, Xiangyu Zhang, Xiaosheng Zhang, Xueji Zhang, Yihui Zhang, Yu Zhao, Siyuan Zhao, Xuanhe Zheng, Yuanjin Zheng, Yu-Qing Zheng, Zijian Zhou, Tao Zhu, Bowen Zhu, Ming Zhu, Rong Zhu, Yangzhi Zhu, Yong Zou, Guijin Chen, Xiaodong 08-03 Innovis Singapore 138634 Republic of Singapore Innovative Centre for Flexible Devices (iFLEX) School of Materials Science and Engineering Nanyang Technological University Singapore 639798 Singapore Department of Biomedical Engineering University of Houston Houston Texas 77024 United States School of Electrical and Electronic Engineering Yonsei University Seoul 03722 Republic of Korea Department of Electrical and Computer Engineering The University of Texas at Austin Austin Texas 78712 United States Microelectronics Research Center The University of Texas at Austin Austin Texas 78758 United States Department of Chemistry and Biochemistry California NanoSystems Institute and Department of Psychiatry and Biobehavioral Sciences Semel Institute for Neuroscience and Human Behavior and Hatos Center for Neuropharmacology University of California Los Angeles Los Angeles California 90095 United States Colloid Chemistry Department Max Planck Institute of Colloids and Interfaces 14476 Potsdam Germany Department of Chemical Engineering Stanford University Stanford California 94305 United States Laboratory of Organic Electronics Department of Science and Technology Campus Norrköping Linköping University 83 Linköping Sweden Wallenberg Initiative Materials Science for Sustainability (WISE) and Wallenberg Wood Science Center (WWSC) SE-100 44 Stockholm Sweden Department of Materials Science and Engineering Stanford University Stanford California 94301 United States Department of Biomedical Engineering and Department of Materials Science and Engineering Carnegie Mellon University Pittsburgh Pennsylvania 15213 United States Department of Bioengineering University of California Los Angeles Los Angeles California 90095 United States School of Chemistry Chemical Engineering and Biotechnology Nanyang Technological University Singapore 637457 Singapore Nanobionics Group Department of Chemical and Biological Engineering Monash University Clayton Australia 3800 Monash

Humans rely increasingly on sensors to address grand challenges and to improve quality of life in the era of digitalization and big data. For ubiquitous sensing, flexible sensors are developed to overcome the limitations of conventional rigid counterparts. Despite rapid advancement in bench-side research over the last decade, the market adoption of flexible sensors remains limited. To ease and to expedite their deployment, here, we identify bottlenecks hindering the maturation of flexible sensors and propose promising solutions. We first analyze continued...challenges in achieving satisfactory sensing performance for real-world applications and then summarize issues in compatible sensor-biology interfaces, followed by brief discussions on powering and connecting sensor networks. Issues en route to commercialization and for sustainable growth of the sector are also analyzed, highlighting environmental concerns and emphasizing nontechnical issues such as business, regulatory, and ethical considerations. Additionally, we look at future intelligent flexible sensors. In proposing a comprehensive roadmap, we hope to steer research efforts towards common goals and to guide coordinated development strategies from disparate communities. Through such collaborative

关键词： soft materials mechanics engineering flexible electronics conformable sensors bioelectronics human-machine interfaces body area sensor networks technology translation sustainable electronics

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Small Uncrewed Aircraft Systems-Based Orthophoto and Digital Elevation Model Creation and Accuracy Evaluation for Airfield Portland Cement Concrete Pavement Distress Detection and Rating

Small Uncrewed Aircraft Systems-Based Orthophoto and Digital...

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International Conference on Transportation and Development 2022, ICTD 2022

作者： All Sourav, Md. Abdullah Ceylan, Halil Kim, Sunghwan Brooks, Colin Peshkin, David Dobson, Richard Brynick, Matthew Dipilato, Mike Dept. of Agricultural and Biosystems Engineering Iowa State Univ. AmesIA United States Dept. of Civil Construction and Environmental Engineering Program for Sustainable Pavement Engineering and Research Iowa State Univ. AmesIA United States Program for Sustainable Pavement Engineering and Research Institute for Transportation Iowa State Univ. AmesIA United States Transportation Practice Area Leader Michigan Tech Research Institute Ann ArborMI United States Applied Pavement Technology Inc. UrbanaIL United States Michigan Tech Research Institute Ann ArborMI United States Federal Aviation Administration Airport Pavement R&D Section William J. Hughes Technical Center NJ United States

ISBN: (数字)9780784484371

ISBN: (纸本)9780784484371

Early detection and repair of airfield pavement distresses are essential aspects of preserving airport pavements for the full spans of their design periods and maintaining their structural integrity, ride quality, and safety. In recent years, various studies have been conducted for pavement distress detection and mapping using alternate data collection methodologies, including small uncrewed aerial systems (sUAS). This study evaluates the usefulness of red-green-blue (RGB) orthophoto and digital elevation models (DEMs) generated from sUAS data in detecting various airfield Portland cement concrete (PCC) pavement distress. Fourteen airfield PCC pavement distresses with different severities were studied using RGB orthophotos with resolutions ranging from 0.8 mm/pixel to 21 mm/pixel and DEM resolutions ranging from 3.0 mm/pixel to 84 mm/pixel. The analysis showed that the RGB optical orthophotos and DEM were useful for detecting 13 out of 14 PCC pavement distresses and confirmation of the location of 11 out of 14 distresses, respectively. © ASCE. All rights reserved.

关键词： Portland cement

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New Technique to Determine Initial Printable Time of 3d Printing Fiber Cement Mortar

SSRN

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SSRN 2022年

作者： Sukontasukkul, Piti Maho, Buchit Khomkum, Sila Pianfuengfoo, Satharat Zhang, Hexin Yoo, Dooyeol Tangchirapat, Weerachart Sae-Long, Worathep Limkatanyu, Suchart Construction and Building Materials Research Center Department of Civil Engineering Faculty of Engineering King Mongkut’s University of Technology North Bangkok Bangkok Thailand Department of Civil Engineering Faculty of Engineering Rajamangala University of Technology Phra Nakhon Thailand School of Engineering and the Built Environment Edinburgh Napier University Edinburgh United Kingdom Department of Architectural Engineering Hanyang University Seongdong-gu Seoul Korea Republic of Department of Civil Engineering Faculty of Engineering King Mongkut’s University of Technology Thonburi Bangkok Thailand Civil Engineering Program School of Engineering University of Phayao Phayao Thailand Department of Civil Engineering Faculty of Engineering Prince of Songkla University Hat Yai Campus Songkla Thailand

In this study, a new technique was proposed to precisely determine the initial printable time as well as the initial width and height of printed cement mortar filament. For cement printing application, it is essential to determine the initial printable time correctly to begin the printing process with minimum or no layer deformation or strain. A conventional method requires a series of printed filaments at different time intervals to estimate the initial printable time. A more precise initial printable time can be obtained by narrowing down the time interval, but it also requires a larger number of printing filaments. The technique proposed in this study utilizes a mathematical relationship between width (or height) versus time obtained from printing a number of filaments at a given time slot and, by employing a derivative method, a more precise initial printable time corresponding to each mortar type can be determined. The obtained initial printable time can also be used in determining the expected initial width and height of each mortar type. There were two types of mortars being investigated: plain mortar and fiber reinforced mortar (FRM) with three different volume fractions. The results showed that the initial printable time obtained using the proposed technique is highly precise, as seen by the resemblance between the expected and actual initial widths. In general, the FRM yielded smaller initial printable times than plain mortar, and the initial printable time also decreased from 72.5 to 58.5 minutes with the increasing fiber content from 0 to 0.1% by volume. Using the difference between the accumulate expected and actual heights, the layer strain for each mortar was obtained. Again, FRM exhibited a smaller layer strain than plain mortar due to the support provided by the fibers. In terms of strength, the printed specimens exhibited lower compressive strength (by about 11-13%) but higher flexural strength (by about 14 -29%) than the cast specimens for both pl

关键词： Mortar

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