Article
Chemistry, Physical
Egor Ivaniuk, Irina Ivanova, Dmitrii Sokolov, Zlata Tosic, Martin Friedrich Eichenauer, Daniel Lordick, Viktor Mechtcherine
Summary: The creation of concrete shells from customized prefabricated modules is an innovative approach that simplifies the construction of free-form surfaces. In the ACDC project at TU Dresden, a material for 3D printing of module contours has been developed based on the principles of SHCC. The material modifications, including the use of cellulose ether and starch ether, have been evaluated through extensive experimentation to ensure high performance and accurate geometry.
Article
Engineering, Manufacturing
Negar Ashrafi, Shadi Nazarian, Nicholas A. Meisel, Jose Pinto Duarte
Summary: Additive manufacturing of cementitious material has become a popular topic in various fields of expertise, focusing on finding suitable mortar for printing architectural structures and adjusting toolpaths to address printing issues. Future studies aim to link material properties with deformation and develop a more generic toolpath generator.
ADDITIVE MANUFACTURING
(2021)
Article
Construction & Building Technology
Eric A. Ohemeng, Stephen O. Ekolu, Harry Quainoo, Abdolhossein Naghizadeh
Summary: This study evaluates the properties of cement masonry mortar containing waste concrete powder (WCP) and explores their economic and environmental advantages. Experimental results show that although the strength of the mortars reduces with increasing WCP content, mortar mixtures with 40-75% WCP still meet the strength requirements for masonry work. Additionally, using WCP significantly reduces the cost and environmental impact of the mortars.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Construction & Building Technology
Junbo Sun, Yimiao Huang, Farhad Aslani, Xiangyu Wang, Guowei Ma
Summary: This study demonstrates the enhancement of mechanical capacity and electromagnetic wave absorption of concrete by optimizing chemical additives and printing parameters. 3D printing technology with enhancement methodology improves microwave absorption and reduces concrete porosity, increasing compressive strength.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Changzai Ren, Dongliang Hua, Yonghui Bai, Shuang Wu, Yonggang Yao, Wenlong Wang
Summary: The iron and steel industry, the power industry, and the mining industry in China produce large volumes of industrial solid waste, causing significant environmental harm. This paper studied the feasibility of using different types of industrial solid waste to prepare eco-friendly construction materials and further develop 3D printing materials. The results showed that this method has the potential to fully utilize industrial solid waste and promote sustainable development.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Construction & Building Technology
David Lopez Lopez, Ernest Bernat-Maso, Lluis Gil, Pere Roca
Summary: Tile vaults are economical, efficient, and expressive masonry structures that can be combined with reinforced concrete to create a new composite system, reducing construction costs. Experimental research demonstrates the feasibility and successful structural performance of this technique.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Review
Construction & Building Technology
Viktor Mechtcherine, Richard Buswell, Harald Kloft, Freek P. Bos, Norman Hack, Rob Wolfs, Jay Sanjayan, Behzad Nematollahi, Egor Ivaniuk, Tobias Neef
Summary: This article provides a comprehensive overview of existing solutions for integrating reinforcement in digital concrete technologies, particularly focusing on 3D concrete printing. The research emphasizes on the technological aspects of the integration process, introducing a generic classification and process description framework, highlighting that reinforcement integration typically occurs separately from concrete shaping. In 3DCP approaches, however, reinforcement can be integrated as part of a single-step AM process during concrete shaping.
CEMENT & CONCRETE COMPOSITES
(2021)
Article
Engineering, Manufacturing
Negar Ashrafi, Shadi Nazarian, Nicholas A. Meisel, Jose Pinto Duarte
Summary: Additive manufacturing of cementitious material involves printing system, toolpath design, and material properties, all of which interact with each other. By modifying the toolpath design, deformation in small scale printed concrete specimens can be compensated for, achieving better shape accuracy.
ADDITIVE MANUFACTURING
(2021)
Article
Chemistry, Physical
Kyung-Sung Min, Kwang-Min Park, Bong-Chun Lee, Young-Sook Roh
Summary: 3D printing concrete for building structures requires consideration of compressive strength and durability against chloride penetration, with attention to the impact of build orientation on performance.
Article
Construction & Building Technology
Viacheslav Markin, Martin Krause, Jens Otto, Christof Schroefl, Viktor Mechtcherine
Summary: This article discusses experimentally determined material properties of four different printable foam concretes with densities ranging from 800 kg/m(³) to 1200 kg/m(³), including fresh-state and hardened-state properties relevant to 3D printing. The possible applications of foam concrete in 3D-printing were assessed based on its economic, sociological, and ecological impacts.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Engineering, Manufacturing
Andrei Jipa, Benjamin Dillenburger
Summary: This article reviews the current state-of-the-art in digital fabrication of concrete components using 3D printing technologies for formwork fabrication. It provides a comprehensive map of five different 3D printing technologies used for formwork production. The discussion includes new geometric possibilities, sustainability potential, and comparison with traditional and digital fabrication tools, serving as a fundamental reference for future research and development of construction standards.
3D PRINTING AND ADDITIVE MANUFACTURING
(2022)
Article
Construction & Building Technology
Hajar Taheri Afarani, William Carroll, Edward J. Garboczi, Joseph J. Biernacki
Summary: This study explores the use of hydrogel-forming polymers as printing aids for cement-based pastes. The results suggest an inverse relationship between gel and paste rheology and printability, providing a framework for selecting printing aids.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Lukas Lachmayer, David Boehler, Niklas Freund, Inka Mai, Dirk Lowke, Annika Raatz
Summary: Shotcrete 3D Printing (SC3DP) is a promising method for the additive manufacturing of concrete components. This paper presents an experimental approach for establishing a flexible regression model of the concrete strands, focusing on width and height as main factors for printing-path planning. The study also demonstrates the effect of parameters on both geometry and mechanical performance of the specimens.
AUTOMATION IN CONSTRUCTION
(2023)
Review
Pharmacology & Pharmacy
Susannah Elizabeth Evans, Tomas Harrington, Maria Cristina Rodriguez Rivero, Etienne Rognin, Tri Tuladhar, Ronan Daly
Summary: The pharmaceutical industry is shifting towards biologics from small molecule drugs globally, driven by the need for more targeted treatments. Researchers and companies are facing shared challenges in developing biopharmaceuticals, including considering mechanical and chemical influences during manufacturing and selecting appropriate hardware.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2021)
Article
Engineering, Manufacturing
Negar Ashrafi, Shadi Nazarian, Nicholas Meisel, Jose Pinto Duarte
Summary: AM technologies have been widely used in architecture for rapid prototyping since the early 1990s. This study proposes a shape grammar-based algorithm that incorporates equations for predicting deformation of concrete during printing, and generates compensated toolpaths. The algorithm is validated through printing experiments and has the potential to be extended to other material mixes.
ADDITIVE MANUFACTURING
(2022)
Article
Construction & Building Technology
Pierre Gilibert, Romain Mesnil, Olivier Baverel
Summary: Efficient design of interlocking assemblies has significant importance for the construction sector and reducing environmental impact. Current research efforts often have limitations on assembly directions or prior knowledge, and do not fully explore the space of possible assemblies. Little research has been conducted on designing assemblies for rotation motions. This study investigates the automatic generation of 2D interlocking sequential assemblies that can be assembled for any prescribed combination of translations and rotations, providing a tool for engineers to explore the space of geometrical form-fitting connections and representing a first step towards an end-to-end workflow for designing interlocking assemblies.
AUTOMATION IN CONSTRUCTION
(2022)
Article
Construction & Building Technology
Oumayma Ahmadah, Hela Bessaies-Bey, Ammar Yahia, Nicolas Roussel
Summary: The use of blended cements to tackle environmental challenges in the concrete industry has gained significant interest. This study proposes and validates a new mix design methodology that focuses on the physical optimization of supplementary cementitious materials (SCMs) to improve the rheology of suspensions. Experimental results show that ternary binders with optimized physical characteristics can enhance the compressive strength of mortar and reduce the clinker content.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Construction & Building Technology
Dirk Lowke, Inka Mai, Emmanuel Keita, Arnaud Perrot, Daniel Weger, Christoph Gehlen, Friedrich Herding, Wenqiang Zuo, Nicolas Roussel
Summary: This paper focuses on the material-process interactions in particle bed binding. After classifying different particle bed binding techniques, the important material-process interactions and their underlying physics are discussed for selective cement activation and selective paste intrusion technique. By controlling the material and process parameters in sub-processes, the printing process and resulting material properties of printed components can be specifically controlled.
CEMENT AND CONCRETE RESEARCH
(2022)
Article
Construction & Building Technology
Wenqiang Zuo, Chenghao Dong, Patrick Belin, Nicolas Roussel, Emmanuel Keita
Summary: This paper focuses on controlling the net geometry of a printed object in powder-bed or particle bed binding technologies. The authors conducted experiments to measure and compare water penetration in different powder-beds, and discovered that the water penetration depth is fully uncontrolled on longer time scales, which has not been reported in literature before. They discussed the physical origin of this feature and how it is hidden by other factors. Moreover, they demonstrated that water penetration depth can be controlled by using a dispersed organic water thickener.
CEMENT AND CONCRETE RESEARCH
(2022)
Article
Construction & Building Technology
Paul Carneau, Romain Mesnil, Olivier Baverel, Nicolas Roussel
Summary: The Layer Pressing Strategy is widely used in large-scale concrete 3D Printing for its capacity to control the layer cross-section and overall printed element geometry. However, deformation of sub-layers may occur due to material squeezing. Currently, printing parameters are mainly determined through trial-and-error procedures, lacking a rational understanding of the underlying mechanics. This article aims to provide insights into the effects of printing parameters on the geometry and stability of the extruded layer and discuss the requirements for controlled layer pressing.
CEMENT AND CONCRETE RESEARCH
(2022)
Article
Construction & Building Technology
Othman Omikrine Metalssi, Rim Ragoug Touhami, Fabien Barberon, Jean -Baptiste d'Espinose de Lacaillerie, Nicolas Roussel, Loic Divet, Jean-Michel Torrenti
Summary: Chemical aggressions from the environment, such as salt ions, can cause damage to reinforced concrete structures before their expected service life. Research on cementitious material's durability has shifted to studying the combined effects of multiple factors on durability damage. This study focuses on the combined chloride-sulfate attacks, investigating the mutual effect of chloride and sulfate ions on materials and the influence of cement type and curing duration. Experimental results reveal the competition between chloride and sulfate ions and how the involved mechanisms change compared to exposure to a single ion.
CEMENT AND CONCRETE RESEARCH
(2023)
Article
Engineering, Civil
Romain Mesnil, Valentin Poussard, Karam Sab, Jean-Francois Caron
Summary: This paper aims to quantify the influence of local lace geometry on the anisotropy of 3D printed structures and proposes a numerical homogenisation scheme for computation. The study reveals that even in the assumption of perfect bonding between layers, the bending stiffness in the two principal directions can differ by an order of magnitude for common lace geometries. The proposed approach demonstrates high accuracy while significantly reducing the degrees of freedom in the numerical model, enabling efficient structural analysis of 3D printed pieces with thousands of layers.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Environmental
Charlotte Roux, Kateryna Kuzmenko, Nicolas Roussel, Romain Mesnil, Adelaide Feraille
Summary: This article presents an environmental assessment of 3D concrete printing and proposes a framework to evaluate its impact. The study finds that the main contributors to the environmental impact are the high requirement concrete and the robotic system.
INTERNATIONAL JOURNAL OF LIFE CYCLE ASSESSMENT
(2023)
Article
Engineering, Civil
Romain Mesnil, Olivier Baverel
Summary: Elastic gridshells are efficient structures that use a network of straight members deformed into doubly curved shapes to cover large spans with minimal material. Geodesic and asymptotic gridshells have been widely used, but this article introduces the concept of pseudo-geodesic gridshells where planks follow pseudo-geodesic curves. A scaling argument and parametric study demonstrate that pseudo-geodesic gridshells may be twice as structurally efficient as geodesic gridshells.
ENGINEERING STRUCTURES
(2023)
Article
Mechanics
A. Geffrault, H. Bessaies-Bey, N. Roussel, P. Coussot
Summary: We investigate different flow regimes of a filament generated through extrusion and propose a simple method to determine the elongational yield stress of simple yield stress fluids. We show that the drop mass after filament breakage and the estimation of the critical radius at the solid-liquid transition can be used to estimate the shear yield stress. Our findings suggest that this approach is valid in a wide range of extrusion velocities and can provide an instantaneous estimation of the shear yield stress without sophisticated equipment.
JOURNAL OF RHEOLOGY
(2023)
Article
Construction & Building Technology
Robert J. Flatt, Nicolas Roussel, Hela Bessaies-Bey, Laura Caneda-Martinez, Marta Palacios, Franco Zunino
Summary: Tomorrow's mineral binders need to incorporate an increasing proportion of mineral powders other than Portland clinker, impacting various industrial properties including fresh state properties. This paper discusses the physical, physico-chemical, and chemical changes that will result from this evolution in mix design. Volume-driven effects control solid fraction, packing properties, and particle morphology, while surface-driven effects modify interparticle forces and the degree of dispersion, affecting the rheology. Early hydration kinetics influence hydrate nucleation and growth, altering surface area, admixture consumption, and cohesion forces. The paper explores these features and their interactions to provide insight into the fresh properties of blended cements.
CEMENT AND CONCRETE RESEARCH
(2023)
Article
Construction & Building Technology
Baddredine El Haddaji, Emmanuel Keita, Aurelie Fabien, Patrick Aimedieu, Nassim Sebaibi, Pascal Collet, Valery Andres, Thomas Porcheron, Henri Van Damme, Annie Audibert-hayet, Nicolas Roussel
Summary: We investigated the penetration and transport properties of a nanosilica-based product in hardened cement-based materials. X-ray microtomography was used to study liquid ingress as a function of time. Additionally, water absorption and chloride penetration were measured to evaluate the effects of nanosilica treatment. Our findings suggest that nanosilica imbibition in cement-based materials leads to particle clogging and phase separation, affecting local concentration and transport properties.
CEMENT AND CONCRETE RESEARCH
(2023)
Review
Construction & Building Technology
Mohamed Lachheb, Nicolas Youssef, Zohir Younsi
Summary: In recent years, there has been a growing demand for environmentally friendly building materials in the construction sector. This has led to increased attention on the use of earth for construction purposes due to its low environmental impact, local availability, and recyclability. Incorporating waste materials into the production of unfired earth bricks has been identified as a potential solution to partially substitute earth while satisfying specific requirements. This approach not only conserves natural resources and reduces energy consumption, but also contributes to efficient waste management. This paper provides an overview of recent research on recycling various types of waste into eco-friendly unfired earth bricks and discusses the effects of waste material incorporation on the thermal and mechanical properties of these bricks.
Proceedings Paper
Architecture
Julien Glath, Tristan Gobin, Romain Mesnil, Marc Mimram, Olivier Baverel
Summary: This article focuses on non-sequential assemblies for reversible construction and illustrates the application of Nexorade through a full-scale prototype. The article provides a detailed explanation of non-sequential assemblies, the choice of geometric shapes for pavilions, mechanical analysis during assembly, and construction details. The authors have successfully demonstrated the feasibility of non-sequential assemblies and suggested future research directions and improvements.
TOWARDS RADICAL REGENERATION
(2023)
Article
Construction & Building Technology
Jia Liang, Qipeng Zhang, Xingyu Gu
Summary: A lightweight PCSNet-based segmentation model is developed to address the issues of insufficient performance in feature extraction and boundary loss information. The introduction of generalized Dice loss improves prediction performance, and the visualization of class activation mapping enhances model interpretability.
AUTOMATION IN CONSTRUCTION
(2024)
Article
Construction & Building Technology
Gilsu Jeong, Minhyuk Jung, Seongeun Park, Moonseo Park, Changbum Ryan Ahn
Summary: This study introduces a contextual audio-visual approach to recognize multi-equipment activities in tunnel construction sites, improving monitoring effectiveness. Tested against real-world operation data, the model achieved remarkable results, emphasizing the potential of contextual multimodal models in enhancing operational efficiency in complex construction sites.
AUTOMATION IN CONSTRUCTION
(2024)
Article
Construction & Building Technology
Jin Wang, Zhigao Zeng, Pradip Kumar Sharma, Osama Alfarraj, Amr Tolba, Jianming Zhang, Lei Wang
Summary: This study presents a dual-path network for pavement crack segmentation, combining Convolutional Neural Network (CNN) and transformer. A lightweight CNN encoder is used for local feature extraction, while a novel transformer encoder integrates high-low frequency attention mechanism and efficient feedforward network for global feature extraction. Additionally, a complementary fusion module is introduced to aggregate intermediate features extracted from both encoders. Evaluation on three datasets confirms the superior performance of the proposed network.
AUTOMATION IN CONSTRUCTION
(2024)
Article
Construction & Building Technology
Pierre Gilibert, Romain Mesnil, Olivier Baverel
Summary: This paper introduces a flexible method for crafting 2D assemblies adaptable to various geometric assumptions in the realm of sustainable construction. By utilizing digital fabrication technologies and optimization approaches, precise control over demountable buildings can be achieved, improving mechanical performance and sustainability.
AUTOMATION IN CONSTRUCTION
(2024)
Review
Construction & Building Technology
Jorge Loy-Benitez, Myung Kyu Song, Yo-Hyun Choi, Je-Kyum Lee, Sean Seungwon Lee
Summary: This paper discusses the advancement of tunnel boring machines (TBM) through the application of artificial intelligence. It highlights the significance of AI-based management subsystems for automatic TBM operations and presents recent contributions in this field. The paper evaluates modeling, monitoring, and control subsystems and suggests research paths for integrating existing management subsystems into TBM automation.
AUTOMATION IN CONSTRUCTION
(2024)
Review
Construction & Building Technology
Alireza Shamshiri, Kyeong Rok Ryu, June Young Park
Summary: This paper reviews the application of text mining and natural language processing in the construction field, highlighting the need for automation and minimizing manual tasks. The study identifies potential research opportunities in strengthening overlooked construction aspects, coupling diverse data formats, and leveraging pre-trained language models and reinforcement learning.
AUTOMATION IN CONSTRUCTION
(2024)
Article
Construction & Building Technology
Zhengyi Chen, Hao Wang, Keyu Chen, Changhao Song, Xiao Zhang, Boyu Wang, Jack C. P. Cheng
Summary: This study proposes an improved coverage path planning system that leverages building information modeling and robotic configurations to optimize coverage performance in indoor environments. Experimental validation shows the effectiveness and applicability of the system. Future research will focus on further enhancing coverage ratio and optimizing computation time.
AUTOMATION IN CONSTRUCTION
(2024)
Review
Construction & Building Technology
Yonglin Fu, Junjie Chen, Weisheng Lu
Summary: This study presents a review of human-robot collaboration (HRC) in modular construction manufacturing (MCM), focusing on tasks, human roles, and interaction levels. The review found that HRC solutions are applicable to various MCM tasks, with a primary focus on timber component production. It also revealed the diverse collaborative roles humans can play and the varying levels of interaction with robots.
AUTOMATION IN CONSTRUCTION
(2024)
Article
Construction & Building Technology
Qiong Liu, Shengbo Cheng, Chang Sun, Kailun Chen, Wengui Li, Vivian W. Y. Tam
Summary: This paper presents an approach to enhance the path-following capability of concrete printing by integrating steel cables into the printed mortar strips, and validates the feasibility and effectiveness of this approach through experiments.
AUTOMATION IN CONSTRUCTION
(2024)
Article
Construction & Building Technology
Honghu Chu, Lu Deng, Huaqing Yuan, Lizhi Long, Jingjing Guo
Summary: The study proposes a method called Cascade CATransUNet for high-resolution crack image segmentation. This method combines the coordinate attention mechanism and self-cascaded design to accurately segment cracks. Through a customized feature extraction architecture and an optimized boundary loss function, the proposed method achieves impressive segmentation performance on HR images and demonstrates its practicality in UAV crack detection tasks.
AUTOMATION IN CONSTRUCTION
(2024)
Article
Construction & Building Technology
Daniel Lamas, Andres Justo, Mario Soilan, Belen Riveiro
Summary: This paper introduces a new method for creating synthetic point clouds of truss bridges and demonstrates the effectiveness of a deep learning approach for semantic and instance segmentation of these point clouds. The proposed methodology has significant implications for the development of automated inspection and monitoring systems for truss bridges.
AUTOMATION IN CONSTRUCTION
(2024)
Article
Construction & Building Technology
Kahyun Jeon, Ghang Lee, Seongmin Yang, Yonghan Kim, Seungah Suh
Summary: This study proposes two enhanced unsupervised text classification methods for domain-specific non-English text. The results of the tests show that these methods achieve excellent performance on Korean building defect complaints, outperforming state-of-the-art zero-shot and few-shot text classification methods, with minimal data preparation effort and computing resources.
AUTOMATION IN CONSTRUCTION
(2024)
Article
Construction & Building Technology
Yoonhwa Jung, Julia Hockenmaier, Mani Golparvar-Fard
Summary: This study introduces a transformer-based natural language processing model, UNIfORMATBRIDGE, that automatically labels activities in a project schedule with Uniformat classification. Experimental results show that the model performs well in matching unstructured schedule data to Uniformat classifications. Additionally, the study highlights the importance of this method in developing new techniques.
AUTOMATION IN CONSTRUCTION
(2024)
Article
Construction & Building Technology
De-Graft Joe Opoku, Srinath Perera, Robert Osei-Kyei, Maria Rashidi, Keivan Bamdad, Tosin Famakinwa
Summary: This paper introduces a digital twin technology combining Building Information Modelling and the Internet of Things for the construction industry, aiming to optimize building conditions. The technology is implemented in a university library, successfully achieving real-time data capture and visual representation of internal conditions.
AUTOMATION IN CONSTRUCTION
(2024)
Article
Construction & Building Technology
Zaolin Pan, Yantao Yu
Summary: The construction industry faces safety and workforce shortages globally, and worker-robot collaboration is seen as a solution. However, robots face challenges in recognizing worker intentions in construction. This study tackles these challenges by proposing a fusion method and investigating the best granularity for recognizing worker intentions. The results show that the proposed method can recognize multi-granular worker intentions effectively, contributing to seamless worker-robot collaboration in construction.
AUTOMATION IN CONSTRUCTION
(2024)
