Article
Materials Science, Multidisciplinary
Yasin Onuralp Ozkilic, Ali Ihsan Celik, Ufuk Tunc, Memduh Karalar, Ahmed Deifalla, Thamer Alomayri, Fadi Althoey
Summary: The influence of waste glass aggregate (WGA) with fly ash in certain proportions on geopolymer concrete (GPC) was studied by varying the molarity and WGA proportion. Tests on workability, setting time, compression strength (CS), splitting tensile (ST), and flexural strength (FS) were performed, and the results showed that slump values increased with higher molarity and lower WG percentages. CS, ST, and FS tended to decrease with increasing proportion, but increased with higher NaOH molarity. An equation was derived to predict the compressive strength of the geopolymer mixture used in this study.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Construction & Building Technology
Marta Roig-Flores, Lucia Reig, Vicente Albero, David Hernandez-Figueirido, Antonio Melchor-Eixea, Angel M. Pitarch, Ana Piquer
Summary: This study focuses on reusing ceramic tile waste in concrete to promote sustainable construction practices and circular economy by reducing natural resource consumption.
Article
Chemistry, Physical
Dong Viet Phuong Tran, Abbas Allawi, Amjad Albayati, Thi Nguyen Cao, Ayman El-Zohairy, Yen Thi Hai Nguyen
Summary: The study found that the mechanical properties and durability of medium-quality concrete incorporating recycled coarse aggregate were similar to reference concrete, but the workability significantly decreased as the replacement percentage of recycled coarse aggregate increased. Additionally, the recycled concrete exhibited higher porosity, leading to longer sound transmission times compared to reference concrete.
Review
Construction & Building Technology
Navdeep Singh, Akhil Singh, Nitin Ankur, Parveen Kumar, Mahesh Kumar, Tarun Singh
Summary: The demand for concrete has increased due to urbanization and development, leading to concerns about the depletion of natural resources. Researchers have been working on innovative materials to replace conventional aggregates without compromising concrete performance. This article critically reviews the literature on the influence of recycled concrete aggregate (RCA) and iron slag (IS) as replacements for natural aggregates. The review provides insights into the properties of concrete and the potential of these alternative materials.
JOURNAL OF BUILDING ENGINEERING
(2022)
Review
Construction & Building Technology
Hongru Zhang, Xin Xu, Wenshen Liu, Baojun Zhao, Qiong Wang
Summary: This paper reviews the effects of recycled aggregate (RA) moisture states on the workability, mechanical performance, long-term properties, and durability of recycled aggregate concrete (RAC). The use of partially saturated RA is reported to improve the strength and reduce shrinkage of RAC, while the use of surface-saturated dry (SSD) RA should be avoided. Pre-saturated RA is regarded as favorable for the workability of RAC with fixed water supply.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Civil
Houssam Eddine Benmiloud, M'hamed Adjoudj, Karim Ezziane
Summary: This article focuses on studying the properties of recycled aggregate concretes (RAC) based on the equivalent water absorption of aggregates and the parent concrete strength of reclaimed concrete aggregates (RCA). New relationships were deduced from the results, showing that a 1% increase in equivalent water absorption led to a 0.12% increase in superplasticizer dosages. It was found that the hyperbolic model is more suitable for estimating the compressive strength and shrinkage of RAC when considering the parent concrete strength and equivalent water absorption. The study also highlights the importance of having a parent concrete strength for RCA that is at least 10 MPa higher than the reference concrete to prevent a drop in compressive strength. For higher equivalent water absorption, the ultimate shrinkage increased and slowed down.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2023)
Review
Construction & Building Technology
Yunhui Pu, Lang Li, Qingyuan Wang, Xiaoshuang Shi, Chenchen Luan, Guomin Zhang, Ling Fu, Abd El-Fatah Abomohra
Summary: This paper summarizes the reaction processes, influencing factors, and mechanisms of accelerated carbonation for treating RCAs and evaluates the quality of carbonated RCAs and properties of concrete incorporating them. The environmental impacts and economic feasibility of this technique are also analyzed, showing improved mechanical properties and durability of concrete containing carbonated RCAs. This technology is considered environmentally friendly and economically feasible.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Reza Soltanabadi, Kiachehr Behfarnia
Summary: The study analyzed the behavior of deep beams containing different types of aggregates. Results showed that replacing NCA with 50% of RCA and RAP led to a reduction in shear capacity, while using 100% replacement with modified mix design achieved similar shear capacity. Deep beams containing RAP had higher absorbed energy and showed greater ductility compared to RCA, which exhibited brittleness. Additionally, the cracking patterns analysis revealed differences in flexural and diagonal cracks among the specimens.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Chemistry, Physical
Cun Hui, Yan Liu, Ran Hai, Mingliang Liu
Summary: This study investigates the workability and mechanical performance of high fluidity recycled concrete through parallel tests. The results indicate that the recycled concrete can meet the design requirements and be used in practical engineering within a certain range of recycled aggregate content and sand ratio.
Article
Construction & Building Technology
Himanshu Sharma, Sanjay Kumar Sharma, Deepankar Kumar Ashish, Suman Kumar Adhikary, Gulab Singh
Summary: Recycling is crucial in sustainable construction, and utilizing recycled aggregate (RA) from construction and demolition waste is a promising solution. In this study, three biomineralization treatment techniques with different cell concentrations of Bacillus sphaericus were applied to treat coarse recycled concrete aggregate (RCA). The treated RCA showed improvements in water absorption, strength, and other properties, and the concrete made with treated RCA performed well in various aspects.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Khaldoun N. Rahal, Khalad Elsayed
Summary: The study investigated the shear behavior of concrete beams containing recycled coarse aggregates (RCA), finding that the use of RCA did not change the mode of failure or directly affect critical diagonal failure cracks. The recycled aggregate concrete (RAC) beams had higher normalized shear strength compared to natural aggregates concrete (NAC) beams, with a limited difference in strength amongst the various percentages of replacement (PR). Calculated strengths based on various codes were found to be conservative for the RAC beams.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Chemistry, Physical
Ibrahim A. Sharaky, Ahmed S. Elamary, Yasir M. Alharthi
Summary: This paper explores the use of recycled fine aggregates and powders from old basaltic concrete and natural basalt to produce new concrete. The study replaces part of the sand and cement with different percentages of recycled wastes. The results show that increasing the curing time has a positive effect on enhancing concrete properties, regardless of the waste source. The recycled powders also slow down the hydration reaction. Additionally, the recycled aggregates and powders achieve comparable strength to ordinary concrete and improve tensile strength. Notably, the mix with 40% recycled fine concrete aggregate demonstrates the highest calcium and silicate content, leading to enhanced interfacial transition zone and concrete properties. Moreover, water absorption decreases with curing age, with the mixes containing 10% and 20% silica fume experiencing the lowest values.
Article
Construction & Building Technology
Carla Mabel Medeiros de Albuquerque Silva, Mara Monaliza Linhares Pereira, Valdirene Maria Silva Capuzzo, Jorge de Brito
Summary: This study investigates techniques to improve the quality of recycled aggregates, such as removing mortar particles and surface modification. The results show that mechanical grinding and a two-stage mixing method can improve the properties of the recycled aggregates. The test results indicate that these methods enhance the compressive strength and tensile strength of concrete. Therefore, the use of these treatments can improve the mechanical properties and durability of concrete produced by recycled aggregates.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Construction & Building Technology
P. Velardo, I. F. Saez del Bosque, M. Sanchez de Rojas, N. De Belie, C. Medina
Summary: The construction industry is increasingly interested in the use of recycled aggregate in concrete manufacture, despite the lower quality of recycled materials. This study found that incorporating polymer pre-treated mixed recycled aggregate can improve concrete durability, with air drying treatment showing better results.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Green & Sustainable Science & Technology
Wanchai Yodsudjai, Kirati Nitichote
Summary: This research found that the quality of recycled aggregate waste significantly impacted the behavior of concrete, finer aggregate increased the weakness part of the concrete resulting in lower compressive strength and increased chloride ion penetration.
Article
Green & Sustainable Science & Technology
Eleni Eleftheriou, Luis Felipe Lopez Munoz, Guillaume Habert, Edwin Zea Escamilla
Summary: The provision of sustainable housing solutions is a major challenge in emerging economy countries. This study assesses the feasibility and benefits of using bamboo in architectural design, and utilizes simplified Life Cycle Assessment (LCA) to evaluate its environmental and socio-economic impacts.
Article
Construction & Building Technology
Yasmine Dominique Priore, Guillaume Habert, Thomas Jusselme
Summary: Challenging climate goals require immediate reductions in greenhouse gas emissions to stabilize long-term temperatures. The carbon budget approach is a useful tool for quantifying remaining carbon allowances for countries, sectors, and buildings. The built environment plays a critical role in current and future carbon emissions, and this article proposes yearly targets for building carbon emissions until 2050 in line with global climate goals and the Swiss strategy. The proposed targets are compared with current practices and future developments, highlighting the challenges faced by the Swiss construction sector.
ENERGY AND BUILDINGS
(2023)
Article
Chemistry, Multidisciplinary
Yi Du, Guillaume Habert, Coralie Brumaud
Summary: The study explores the use of natural tannin extracts and iron compounds to create poured earth material with higher strength and water resistance, paving the way for locally tailored solutions for circular and climate-neutral construction.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(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
Construction & Building Technology
Natalia Pires Martins, Burhan Cicek, Coralie Brumaud, Ruben Snellings, Guillaume Habert
Summary: By adjusting the reaction product assemblage of the binder and using local low footprint raw materials, this paper revisits a vernacular stabilization technique to formulate a trass-gypsum-lime binder with increased strength and reduced environmental impact. The increase in trass content and addition of a small amount of sucrose result in improved hydrated phase assemblage and strength gain, ultimately optimizing the strength/impact ratio.
CEMENT AND CONCRETE RESEARCH
(2022)
Article
Construction & Building Technology
Anastasija Komkova, Guillaume Habert
Summary: This study compares the environmental impacts of alkali-activated concretes containing blast furnace slag, fly ash, and metakaolin with Portland cement concretes. The production processes of the mix constituents and transportation distances are evaluated, and it is found that alkali-activated materials have significantly lower CO2 eq. emissions than PC concretes. Taking into account the variability in production technologies of precursors and activators, alkali-activated materials still have lower CO2 eq. emissions than PC concretes.
CONSTRUCTION AND BUILDING MATERIALS
(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
Computer Science, Interdisciplinary Applications
Maliki Moustapha, Alina Galimshina, Guillaume Habert, Bruno Sudret
Summary: Accounting for uncertainties is crucial for the safety of engineering structures. This study proposes a method for robust design optimization by considering quantiles of objective functions. By introducing the concept of common random numbers and using a surrogate-assisted approach, the computational cost of the optimization problem is reduced.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2022)
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
Engineering, Environmental
Anastasija Komkova, Guillaume Habert
Summary: Global objectives to mitigate climate change are driving transformations in the construction sector. Research is underway to find alternative materials to carbon-intensive cement, such as alkali-activated materials. However, barriers to adopting these solutions include the lack of supply chains and collaborations between waste producers and concrete manufacturers. A proposed framework that combines geospatial analysis, life cycle assessment, and linear optimization models helps identify optimal supply chain networks for waste materials, with a focus on transportation. Case studies in Switzerland revealed that direct collaboration between waste producers and concrete manufacturers significantly reduces CO2 emissions and transportation costs compared to conventional concrete production using cement.
RESOURCES CONSERVATION AND RECYCLING
(2023)
Article
Green & Sustainable Science & Technology
Mariam Abdulkareem, Anastasija Komkova, Jouni Havukainen, Guillaume Habert, Mika Horttanainen
Summary: Global objectives to mitigate climate change have driven the development of geopolymer as a sustainable alternative to carbon-intensive cement in the construction industry. This study assessed the feasibility of using conventional and alternative precursors in geopolymer mixes for Belgium and Finland, considering environmental, economic, and resource availability indicators. Optimal precursor combinations were identified using a multi-objective optimization technique, and the compressive strength of the mixes was predicted through linear regression analysis.
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)
Article
Construction & Building Technology
Daria Ardant, Coralie Brumaud, Arnaud Perrot, Guillaume Habert
Summary: The use of excavated earth as raw materials for construction is gaining interest due to its circular and carbon neutral characteristics. However, the high variability in properties of the soil composition makes it challenging to utilize. This paper highlights key parameters, such as the solid volume fraction of clay paste, clay activity, and dry density, which overcome the variability of soil composition and predict the properties of earth-based concrete. These findings provide a basis for optimized mix design strategies for robust earth concrete products.
CEMENT AND CONCRETE RESEARCH
(2023)
Article
Environmental Sciences
Catherine Phan-huy, Verena Goswein, Guillaume Habert
Summary: A transformation towards a bioeconomy is necessary to reduce environmental impacts and resource requirements. This paper proposes a new methodology that compares the climate effectiveness of using straw in different sectors and provides insights for policymakers to optimize resource allocation and incentivize biobased activities.
ENVIRONMENTAL RESEARCH LETTERS
(2023)
