Article
Construction & Building Technology
Van Quan Tran, Viet Quoc Dang, Lanh Si Ho
Summary: This study focused on evaluating the compressive strength of concrete made from recycled concrete aggregate (RCA) using different single and hybrid machine learning models. The results showed that the hybrid models outperformed single models in terms of prediction accuracy. This research provides valuable insights for the systematic evaluation of compressive strength prediction of recycled concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Abdeldjalil Khelafi, Nouria Kaid, Rabah Soltani, Djamel Elddine Kerdal, Hamid Khelafi
Summary: This research work focused on the viability and valuation of recycled concrete sand aggregates (RCSAs) in the preparation of mortars. An alternative recycling process was proposed to improve the physical and mechanical properties of RCSAs-based mortars and promote efficient use of demolition concrete waste. The experimental results showed improvement and good interaction between the cement matrix and sand in RCSAs-based mortars, highlighting the effectiveness of the alternative recycling method in enhancing composition quality and mechanical performance.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Deepak Prasad, Arunabh Pandey, Brind Kumar
Summary: The use of recycled concrete aggregate as a potential substitute for natural aggregates aids in sustainable development and ecological balance. Mechanical beneficiation and lime treatment can improve the properties of concrete, allowing for up to 30% replacement of natural aggregates.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Yi Liu, Pengfei Ren, Natividad Garcia-Troncoso, Kim Hung Mo, Tung-Chai Ling
Summary: This study aims to investigate the compressive strength and tensile bond strength of concrete made with recycled aggregates (RAs). The results showed that despite the weaker intrinsic properties of the RAs, the RCA and RCBA concrete exhibited higher compressive strength and tensile bond strength compared to the natural aggregate (NA) concrete. Microhardness testing and SEM-BSE image analysis further confirmed the enhanced performance of the interfacial transition zone (ITZ) in the RAs concretes.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Khaldoun N. Rahal, Walid Hassan
Summary: The study found that concrete made with recycled aggregates had lower shear and compressive strengths compared to natural aggregates concrete with similar water to cementitious materials ratios. However, the relationship between push-off shear strength and cube compressive strength was similar for both types of aggregates. Lower water to cementitious materials ratios resulted in smoother failure surfaces, while the use of recycled aggregates slightly affected the failure surfaces. Additionally, a relationship between tensile cracking strength and push-off shear strength for concrete specimens was established.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Fa Yang, Yunshi Yao, Xinxin Wang, Jin Wei, Zhongxu Feng
Summary: This study investigates the performance of recycled and multi-recycled concrete using the vibration mixing process. The results show that the vibration mixing process significantly improves the compressive strength of the concrete and leads to better and more stable concrete quality. The study also finds that vibration mixing has a significant influence on the splitting tensile strength of the concrete.
Article
Construction & Building Technology
Tesfay Kiros Mehari, Chun -Tao Chen
Summary: This study investigated the effects of using recycled fine and coarse aggregates on the properties of plastic concrete. By employing a densified mixture design algorithm, it was found that the use of recycled aggregates had an impact on various properties of the concrete, such as workability, bleeding, water permeability, and strength. The study also revealed that increasing the replacement ratio of the recycled fine aggregates resulted in a decrease in strength, while the replacement ratio of the coarse aggregates could slightly recover at certain levels.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Ashish Kumer Saha, Subhra Majhi, Prabir Kumar Sarker, Abhijit Mukherjee, Ayesha Siddika, Farhad Aslani, Yan Zhuge
Summary: The aim of this research was to develop an equation to predict the compressive strength of concrete in terms of ultrasonic pulse velocity (UPV) and concrete mix design parameters. The equation was validated through statistical analysis and compared with experimental data from various published literature, demonstrating an overall coefficient of determination (R-2) of 0.88.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Construction & Building Technology
Anindya Samya Saha, Khan Mahmud Amanat
Summary: This paper investigates the performance of normal strength concrete using the rebound hammer, focusing on the influence of coarse aggregate. Different types of concrete show specific correlations between rebound number and compressive strength, with empirical expressions proposed for each type. The study analyzes aggregate properties, mortar content, and water-cement ratio to explain the variation in compressive strength and rebound number, providing important insights for on-site concrete quality assessment.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
P. Jagadesh, Jesus de Prado-Gil, Neemias Silva-Monteiro, Rebeca Martinez-Garcia
Summary: The requirement for concrete compressive strength in the construction sector has led researchers to explore the use of recycled aggregates in self-compacting concrete (SCC) to reduce costs and promote sustainability. Through machine learning techniques, a model was developed using 515 SCC mix design samples, and the correlation between input and output variables was analyzed to determine the best machine learning methods.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Construction & Building Technology
Zuowei Liu, Chee Seong Chin, Jun Xia
Summary: Biomineralisation induced by denitrification bacteria can improve the properties of recycled coarse aggregate and concrete, reducing water absorption, increasing density, and enhancing compressive strength while avoiding the consumption of urea and release of ammonia.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Review
Engineering, Environmental
Bo Wang, Libo Yan, Qiuni Fu, Bohumil Kasal
Summary: Using recycled aggregates from construction and demolition waste can help preserve natural resources, reduce landfill demand, and contribute to sustainable built environment. Recycled aggregate concrete properties include workability, physical and chemical properties, mechanical properties, and long-term performance.
RESOURCES CONSERVATION AND RECYCLING
(2021)
Article
Construction & Building Technology
Banoth Gopalakrishna, Dinakar Pasla
Summary: In order to address the environmental impact of the construction industry, sustainable practices such as the use of geopolymer binder with recycled aggregate concrete are necessary. This study aimed to improve the quality of high-strength recycled aggregates geopolymer concretes by incorporating metakaolin in varying percentages and adhering to DIN specifications. The results showed that these green mixtures exhibited excellent mechanical and durability performance, making them suitable for various construction projects.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Si-Min Jian, Bo Wu
Summary: The study suggests that reusing coarsely crushed demolished concrete lumps (DCLs) and recycled coarse aggregates (RAs) simultaneously in recycled lump/aggregate concrete (RLAC) can significantly increase the total waste content compared to recycled aggregate concrete (RAC). It was found that even when the total waste content in RLAC reaches 54.6%, satisfactory compressive strength can still be achieved. However, the compressive strength of RLAC containing 100% RA replacement ratio is much lower compared to RAC.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Ibtissam Abalouch, Siham Sakami, Fatima-Ezzahra Elabbassi, Lahcen Boukhattem
Summary: This work aimed to develop a new composite material by substituting sand with recycled waste glass (RWG) in concrete. It was found that incorporating 20% of RWG volume rate significantly increased compressive strength of the concrete, while exceeding this rate resulted in a decrease in compressive strength. Furthermore, there were improvements in thermal properties, suggesting the potential use of this new composite material as a structural material in construction.
APPLIED SCIENCES-BASEL
(2021)
Article
Construction & Building Technology
Artur Spat Ruviaro, Geannina Terezinha dos Santos Lima, Laura Silvestro, Madeleing Taborda Barraza, Janaide Cavalcante Rocha, Jorge de Brito, Philippe Jean Paul Gleize, Fernando Pelisser
Summary: The study systematically investigated the influence of burning temperature on the characteristics of oat husk ash (OHA) and its use as a supplementary cementitious material (SCM). The results showed that replacing up to 20 % of Portland cement with OHA burned at a temperature of 600 degrees Celsius improved the compressive strength of cement pastes without compromising their hardening state. The study also demonstrated the environmental potential of oat husk as biomass and its positive impact on the eco-efficiency index of composite matrices.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Energy & Fuels
Ana Ferreira, Manuel Duarte Pinheiro, Jorge de Brito, Ricardo Mateus
Summary: This study evaluates the energy and carbon emissions of a European retail building and compares the material flow with energy and carbon emissions. The results show that the embodied energy and carbon emissions of building materials account for 32% and 94% of the total lifecycle energy and carbon emissions, respectively. By choosing low-carbon building materials, the energy and carbon emissions of the building can be reduced.
Article
Green & Sustainable Science & Technology
Ana Ferreira, Manuel Duarte Pinheiro, Jorge de Brito, Ricardo Mateus, Rita Mendonca
Summary: This study examined the cost-optimal levels of envelope solutions in retail buildings in accordance with the Energy Performance of Building Directive and Portuguese regulation. The findings suggest that solutions with lower U-values, such as vacuum insulation panels and sandwich panels, can lead to 2-5% energy savings and are cost-effective over a 15-50 year period.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Physical
Antonio Galderisi, Miguel Bravo, Gianluca Iezzi, Giuseppe Cruciani, Eleonora Paris, Jorge de Brito
Summary: In this study, construction and demolition waste (CDW) from earthquake rubbles were utilized as recycled aggregates (RA) in cementitious binders. The amount of crystalline phases in each RA type was determined using X-ray Powder Diffraction (XRPD) analysis. It was found that recycled mortars rich in concrete, natural stones, and tiles exhibited better mechanical performance compared to those prepared with recycled bricks, perforated bricks, and roof tiles. Furthermore, the use of a mixture of recycled aggregates and quartz-rich virgin aggregates in mortars resulted in superior mechanical characteristics.
Article
Chemistry, Physical
Ghandy Lamaa, David Suescum-Morales, Antonio P. C. Duarte, Rui Vasco Silva, Jorge de Brito
Summary: Three industrial aluminosilicate wastes were studied as precursors for alkali-activated concrete. Different combinations of sodium hydroxide and sodium silicate solutions were tried to find the optimum solution for mechanical performance. The precursors showed reactivity when alkali-activated, and mixes with slag and glass exhibited compressive strengths of almost 40 MPa.
Article
Chemistry, Physical
Lucas Sequeira, Javier Forero, Miguel Bravo, Luis Evangelista, Jorge de Brito
Summary: The durability performance of sustainable concrete with the incorporation of reactive magnesium oxide (MgO) and fly ash (FA) was evaluated. The partial replacement of cement with these two materials resulted in significant reduction of shrinkage and offers sustainability benefits. Both individual incorporation of MgO and FA, and their simultaneous incorporation were evaluated. Performance losses between 3% and 95% were obtained in all tests, however, the difference in performance relative to reference concrete tends to decrease over time.
Review
Chemistry, Physical
Ghandy Lamaa, Antonio P. C. Duarte, Rui Vasco Silva, Jorge de Brito
Summary: This paper presents a literature review on the effects of accelerated carbonation on alkali-activated materials. It provides a better understanding of the influence of CO2 curing on the chemical and physical properties of alkali-activated binders. The changes in chemistry, mineralogy, and physical properties caused by induced carbonation are discussed, along with the influence of this curing method on the strength development of alkali-activated materials.
Article
Chemistry, Physical
Lucas Sequeira, Blas Cantero, Miguel Bravo, Jorge de Brito, Cesar Medina
Summary: In the construction industry, cement is the most widely used material. To improve sustainability, it is important to find more sustainable alternatives for cement. This study analyzes the mechanical properties of mortars containing recycled cement, fly ash, and magnesium oxide. The results show that ternary mortars with these materials have improved mechanical capacity compared to binary mortars.
Article
Construction & Building Technology
Filipe Miguel, Jorge de Brito, Rui Vasco Silva
Summary: The increasing demand for sustainability in construction has led to interest in using recycled materials in concrete production. This study aims to evaluate the performance of alkali activated concrete with different contents of fly ash (FA) and municipal solid waste incinerator bottom ash (MIBA). Tests were conducted on various mixes including natural aggregates and recycled aggregates from construction and demolition waste. The results showed that substituting FA with MIBA negatively affected durability-related performance, while the incorporation of recycled aggregates significantly decreased compressive strength and overall durability performance. However, the use of recycled aggregates resulted in less dimensional variation in terms of shrinkage.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Qifan Ren, Joao Pacheco, Jorge de Brito
Summary: This paper proposes refined formulae to consider the wall effects in the geometric mesostructure modelling of concrete. The calibration of the wall effect in geometric modelling has been rarely researched. The proposed formulae are calibrated and validated using measurements on real specimens, and a demonstrative application shows good agreement with experimental data.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Materials Science, Characterization & Testing
Maria Paula Mendes, Ana Raimundo, Marina Bimbati, Rita Nogueira, Ines Flores-Colen, Jorge de Brito
Summary: Rice husk, a commonly grown and consumed cereal, is often burned or landfilled due to its low nutritional value. However, it has the potential to be used in thermal and acoustic nonstructural applications when properly incorporated into composites. By controlling the cement usage and the ratio of rice husk, it is possible to produce RH-based composites with stable performance and reduced cement content.
JOURNAL OF TESTING AND EVALUATION
(2023)
Article
Materials Science, Multidisciplinary
Tian Li, Rita Nogueira, Jorge de Brito, Jiaping Liu
Summary: This study investigates the influence of fine aggregate's grading on mortar's rheology. The non-uniformity coefficient (Cu) and the coefficient of curvature (Cc) were used to quantitatively evaluate the fine aggregate's grading. The results show that Cu provides a good quantitative description of the fine aggregate's grading and presents a good correlation with its packing density. The study suggests that for a packing density higher than a critical value (0.7391), improving the rheology of mortar may be more effective by acting on aspects other than the fine aggregate's grading.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Editorial Material
Construction & Building Technology
Ines Flores-Colen, Jorge de Brito
INTERNATIONAL JOURNAL OF BUILDING PATHOLOGY AND ADAPTATION
(2023)
Review
Construction & Building Technology
Joana Barrelas, Ana Silva, Jorge de Brito, Antonio Tadeu
Summary: Climate change could significantly impact buildings if not recognized properly. Consideration of climate action at the planning stage is crucial to promote durability of constructions. Portugal, as part of the Mediterranean region, is vulnerable to climate change impacts, such as higher temperatures and decreased precipitation. The research focuses on assessing the risks of climate-induced degradation on exterior cement renders.
Article
Environmental Sciences
Ana Ferreira, Vitor Sousa, Manuel Pinheiro, Ines Meireles, Cristina Matos Silva, Jorge Brito, Ricardo Mateus
Summary: This study explores the technical and economic feasibility of rainwater harvesting systems as an alternative water source for a retail store in southern Portugal. The simulation shows that the system can save 32-36% of water consumption, resulting in a financial gain of 330-372 euros per month.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Construction & Building Technology
Qi Jiang, Wei Liu, Shaopeng Wu, Xuanwen Gou
Summary: This study analyzes the erosion mechanisms of NaCl solution on asphalt concrete and finds that NaCl solution softens asphalt and promotes the intrusion of crystalline salt into it. Salt crystallization alters the surface roughness of aggregates, resulting in a decrease in skid resistance but an improvement in compressive strength. Additionally, the concentration of NaCl solution initially has no significant impact on the mechanical performance of asphalt concrete, but its domination gradually increases with the intensification of cyclic effects.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Lili Kan, Lan-qing Dai, Ning Kong, Bin Peng, Fei Wang
Summary: This paper investigates the effect of freezing and thawing cycles on the tensile behavior of cracked ultra-high performance concrete (UHPC). The results show that long-term freezing and thawing action deteriorates the cracking strength, tensile strength, tensile strain, and strain energy of cracked UHPC. On the other hand, the action of water generally favors the development of tensile properties of UHPC. The crack distribution tends to be unsaturated under freezing and thawing environment, and the re-hydration reaction is hindered. The pore structure near the crack varies under different environments.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Xin Xiao, Jingwei Li, Qingke Meng, Xiangshan Hou, Yanhui Liu, Xujiang Wang, Wenlong Wang, Shengtao Lu, Yuzhong Li, Yanpeng Mao, Tong Li
Summary: Preparing gypsum-based self-leveling mortar (GSLM) using beta-hemihydrate gypsum and solid wastes-derived sulfoaluminate cement (WSAC) can improve the mechanical performance of the mortar, but phosphorus impurities can weaken the hydration speed and degree.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Sihang Bao, Junzhen Di, Yanrong Dong, Ziqing Gao, Qing Gu, Yuanfang Zhao, Hongyu Zhai
Summary: Tailings dam break and leakage accidents pose a threat to the safety of people in mining areas and cause severe environmental pollution. This study focuses on solidifying tailing sand using microbial induced calcite precipitation (MICP) to improve strength and fix heavy metals. The curing time of MICP bio-cemented tailings is found to significantly impact the strength of tailings, while its effect on heavy metal fixation is minimal. The optimized MICP curing time is 10 days, resulting in improved strength and cementation of tailings particles.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Ferhat Benmahiddine, Fares Bennai, Achraf Charaka, Ameur El Amine Hamami, Abdelkader Tahakourt, Rafik Belarbi
Summary: This paper studied the effects of hysteresis on the hygrothermal behavior at the building scale. Through laboratory validation and numerical simulations, it was found that hysteresis has a significant impact on the relative humidity and total heat fluxes in buildings, while it does not have a noticeable effect on temperature variations.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
You Gao, Wei He, Xiayang Zhang, De'an Sun, Pei Li
Summary: This study determined the boundary line between the swelling and compression deformation zone in lateritic clay through wetting tests, and proposed a simple bimodal SWRC model. It also found that the existing strength model underestimated the tested values in the medium to high suction range, therefore a segmented strength equation was introduced for enhanced predictions of the strength properties of lateritic clay.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Prabhath Ranjan Kumar Soda, Asheer Mogal, Kalyan Chakravarthy, Nikhil Thota, Nimish Bandaru, Sanjay Kumar Shukla, K. M. Mini
Summary: This study investigates the use of encapsulated bacteria to improve the self-healing ability of concrete. Through various tests, it is found that using 20% cement-coated alginate beads (CCAB) and 5% nanosilica (NS) can achieve optimal strength and healing. This research is significant for enhancing the durability of concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Shizhe Wang, Haiping Wu, Wen Yang, Wei Wang, Zhibo Zhu, Kun Nie, Luoxin Wang, Hua Wang, Jing Wu
Summary: In this study, photothermal-heat storage concrete (PHSC) was developed with excellent photothermal conversion performance and heat storage capacity. By absorbing and storing solar energy during the day and releasing it at night, PHSC can effectively reduce energy consumption in buildings.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Robin Deb, Jialuo He, Geetika Mishra, Yaghoob (Amir) Farnam
Summary: Incorporation techniques of phase change materials in cementitious composites have a significant influence on thermal properties. This study investigated the thermal behavior of low-temperature PCM when subjected to varying temperature change rates and pore confinement inside the porous network of lightweight aggregates. The results showed that ramp rates affect the nucleation and crystallization growth process during the phase transition, and the pore structure of the aggregates affects the supercooling phenomenon and confinement pressure of the PCM.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Eduardo Ferreira, Payam Sotoudeh, Dagmar Svecova
Summary: This study investigates the fatigue behavior of concrete under different stress reversal conditions. The results indicate that stress reversal generally causes more severe damage and reduces the cycles to failure compared to tensile fatigue. Additionally, adding some level of compression contributes to the energy required for failure under stress reversal fatigue. Specimens with higher concentration of fractured aggregates achieve longer fatigue lives.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Mag Raj Gehlot, Sandeep Shrivastava
Summary: This study evaluates the compatibility relationship between plaster bonds and the substrate under an accelerated aging environment, and finds that incorporating an appropriate amount of granite cutting waste can improve the strength parameters and adhesion of the cement mortar.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Min Zhang, Qirui Luo, Mingke Deng, Shixing Zhao
Summary: This study investigated the bond behavior between carbon FRCM composites with added short fibers and concrete substrates. The effects of different factors were considered and 36 specimens were tested and discussed. The experimental results were analyzed in terms of failure mode, load-slip curve, and characteristic parameters, and the contribution of weft yarns was taken into account in the developed bondslip model.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Dengkai Liu, Hongniao Chen, Ray Kai Leung Su
Summary: The susceptibility of building stones to fire and high temperature was investigated in this study by examining their physical and mechanical properties. The results show that both compressive and tensile properties of stones are affected by temperature changes. The tensile strength is particularly sensitive to temperature changes, requiring special attention to the components subjected to tensile stress in stone buildings. Principal component analysis was used to predict the mechanical properties of stones, providing a new method for calculating the residual mechanical properties after high temperature or fire.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Joso Maria Raposo, Eduardo Cavaco, Luis Costa Neves, Eduardo Julio
Summary: This paper investigates the correlation between the friction coefficient and the surface roughness of concrete-to-concrete interfaces. Experimental tests were performed on specimens with different surface treatments, and the surface roughness parameters were analyzed and correlated with the shear strength and friction coefficient. The results showed that certain roughness parameters had a strong positive correlation with the friction coefficient, while others had little or no correlation. A novel combined roughness parameter with optimized correlation was proposed.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Chiara Riccardi, Massimo Losa
Summary: The interest in using bio materials in asphalt pavements is growing due to economic reasons and environmental benefits. This study aimed to review the use of bio extenders as additives in binders, with a focus on replacements greater than 20% of fossil binder. The properties of bio-extended binders were found to vary substantially depending on the biomass source and production process.
CONSTRUCTION AND BUILDING MATERIALS
(2024)