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
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
Lihua Zhu, Qiujun Ning, Wei Han, Leilei Bai
Summary: The mechanical performance of recycled aggregate concrete was significantly improved by incorporating silica fume, which improved the quality of the recycled coarse aggregate and reduced the thickness of the interfacial transition zone.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Long Li, Dongxing Xuan, S. H. Chu, Jian Xin Lu, Chi Sun Poon
Summary: The study evaluated the efficiency of a nano-silica treatment method for recycled aggregate concrete and found that pre-spraying NS suspension on the surface of recycled aggregate had a superior effect over premixing NS with water. The optimal NS suspension dosages were identified for each method, while NS particle size had little influence on performance. The better performance of the pre-spraying method could be attributed to the improved interfacial transition zone between recycled aggregate and new mortar.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Jing Hu, Pengfei Liu, Qibo Huang, Zhendong Qian, Sang Luo
Summary: Studying the effect of recycled aggregates (RA) on the interfacial zone failure of asphalt mixture can enhance the utilization of construction and demolition wastes (CDW) in pavement engineering. Results show that increasing RA percentage causes more interface failure, with the damage of cement mortar and its interface with asphalt mortar being the primary resources of failure.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Dujian Zou, Zhongzhen Wang, Mingming Shen, Tiejun Liu, Ao Zhou
Summary: Two silane emulsion modification methods, surface modification of recycled aggregate and integral modification of cement matrix, were used to improve the freeze-thaw durability of recycled aggregate permeable concrete. The results indicate that surface modification of recycled aggregate can more effectively increase both the compressive strength and freeze-thaw durability of recycled aggregate permeable concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Yidong Xu, Bowen Lin, Xiaoniu Yu, Shi-Tong Li
Summary: This study synthesized MgAl-LDHs/TiO2 by mixing MgAl-LDO (MgAl-LDHs calcined products) and TiO2 during the reconstruction of MgAl-LDHs laminates. The effects of MgAl-LDHs/TiO2 on cement paste properties and recycled aggregates were investigated. The addition of MgAl-LDHs/TiO2 promoted the hydration of ordinary Portland cement (OPC) and improved the structural properties of the interface between the old and new paste. MgAl-LDHs/TiO2 also exhibited photocatalytic activity on recycled aggregates. The results suggest that MgAl-LDHs/TiO2 has potential applications in enhancing cement paste properties and promoting the use of recycled aggregates.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Reza Soltanabadi, Kiachehr Behfarnia
Summary: This study investigates the mechanical properties and microscopic structure of concretes with different aggregates. The results show that using recycled aggregates decreases the concrete's mechanical properties and alters the stress-strain curves and interfacial transition zone.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
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)
Article
Construction & Building Technology
Song Gao, Jia Guo, Yaguang Zhu, Zuquan Jin
Summary: Applying recycled aggregate aligns with green and environmental protection concept, but it also brings a complex interface structure that deteriorates the performance of recycled aggregate concrete. By investigating the properties of the interfacial transition zones (ITZs) and using digital image correlation (DIC) technology, the study analyzed the influence on the performance of recycled aggregate concrete. The experimental results showed that targeted strengthening of ITZs improved the mechanical properties and reduced porosity, with mortar strengthening being more effective.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Yingwu Zhou, Ruyin Zhang, Ran Zhu, Zhipei Guan, Feng Xing, Menghuan Guo, Wanlin Cao, Biao Hu
Summary: A method of strengthening recycled coarse aggregate (RCA) by applying a fiber reinforced coating layer is proposed. The strengthening layer composition is explored, reducing the crushing index of the strengthened RCA (SRCA) by 37.4%. Microstructure investigations demonstrate densified interfacial transition zones (ITZs) in SRCA-made concrete (SRC), contributing to strength improvement. In SRC, distributed cracks are generated without major cracks, and the compressive strength is increased by 29.7% at 28 days. Numerical analyses show that cracks mainly develop in new mortar, while damage localization in both new and old ITZs is negligible until 80% post-peak.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Kaiyun Wu, Surong Luo, Jianlan Zheng, Jiantian Yan, Jianzhuang Xiao
Summary: The carbonation treatment improved the properties of weak multiple interface transition zones (ITZs) in recycled aggregate concrete (RAC), enhancing the performance of the concrete. Different carbonation conditions had consistent effects on the microproperties and macroproperties of RAC, with compressive strength and chloride ion penetration resistance showing a linear correlation with the modulus of the ITZ.
CEMENT & CONCRETE COMPOSITES
(2022)
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
Maedeh Hosseinzadeh, Mehdi Dehestani, Alireza Hosseinzadeh
Summary: This paper investigates the use of recycled aggregates and fly ash in concrete to reduce the demand for natural resources and lower greenhouse gas emissions. Machine learning techniques, specifically regression and classification tasks, are used to accurately predict the mechanical properties of Fly Ash Recycled Aggregate Concrete (FARAC). The findings show that the algorithms used are effective in predicting compressive and tensile strength as well as slump, with the Random Forest and XGBoost algorithms achieving the highest accuracy.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Menglin Li, Jun Xie, Shaopeng Wu, Junlin Chen
Summary: This study characterized the microscopic morphology and structure of recycled concrete aggregate (RCA) and investigated its impact on the strength of asphalt mixture. Results showed that the properties of RCA were greatly influenced by cement mortar. Asphalt mixtures with RCA had higher air voids and voids in mineral aggregate, and lower asphalt saturation compared to conventional asphalt mixtures. The influence of RCA on asphalt mixture performance mainly lied in reducing the strength of asphalt mortar and decreasing the skeleton strength of asphalt mixtures.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Environmental Sciences
Ernesto Villar-Cocina, Loic Rodier, Holmer Savastano, Manuel Lefran, Moises Frias Rojas
WASTE AND BIOMASS VALORIZATION
(2020)
Article
Chemistry, Physical
M. Frias, R. Vigil de la Villa, S. Martinez-Ramirez, R. Garcia-Gimenez, M. I. Sanchez de Rojas
APPLIED CLAY SCIENCE
(2020)
Article
Construction & Building Technology
Daniel da Silva Andrade, Joao Henrique da Silva Rego, Moises Frias Rojas, Paulo Cesar Morais, Maria Jose de Souza Serafim, Anne Neiry Lopes
ACI MATERIALS JOURNAL
(2020)
Article
Construction & Building Technology
Moises Frias, Laura Caneda-Martinez, M. Isabel Sanchez de Rojas, Carlos Tenazoa, Elena Flores
CEMENT & CONCRETE COMPOSITES
(2020)
Article
Green & Sustainable Science & Technology
Rebeca Martinez-Garcia, Maria Isabel Sanchez de Rojas, Julia Ma. Moran-del Po, Fernando J. Fraile-Fernandez, Andres Juan-Valdes
Summary: The research aims to evaluate the feasibility of incorporating FRCA from urban C&DW into the production of cement-based mortars and improving their quality using simple processing techniques. Mechanical properties of four mortar mixes were evaluated, showing that the optimal usage of FRCA is 25%.
Article
Chemistry, Physical
Laura Caneda-Martinez, Manuel Monasterio, Jaime Moreno-Juez, Sagrario Martinez-Ramirez, Rosario Garcia, Moises Frias
Summary: This study investigated the influence of fine concrete fractions from construction and demolition waste on blended cement pastes, finding that they can be used as partial replacements without compromising physical and mechanical requirements of common cements. The environmental benefits of reusing these fine wastes were examined, and the Life Cycle Assessment (LCA) showed a reduction in overall environmental impact in proportion to the replacement rate, aligning with Circular Economy goals and the 2030 Agenda for Sustainable Development.
Article
Chemistry, Physical
Ernesto Villar-Cocina, Moises Frias, Holmer Savastano, Loic Rodier, Maria Isabel Sanchez de Rojas, Isabel Fuencisla Saez del Bosque, Cesar Medina
Summary: This research work quantitatively characterizes different mixtures of pozzolanic materials and their reactivity by calculating the kinetic parameters of the reaction in the pozzolan/calcium hydroxide system. The values of the kinetic parameters serve as precise quantitative indexes of the pozzolanic activity of the binary combinations of materials, which can be useful in the production of ternary cements. The study shows that certain binary blends have higher pozzolanic reactivity compared to others, which can guide the selection of materials for cement production.
Article
Chemistry, Multidisciplinary
Isabel Fuencisla Saez del Bosque, Maria Isabel Sanchez de Rojas, Gabriel Medina, Sara Barcala, Cesar Medina
Summary: This study examines the use of ultrafine construction and demolition waste and biomass-fuelled power plant waste as pozzolanic additives in cement to enhance durability. The results indicate that blended cements containing 20%U-C&DW + 10%BA or 20%U-C&DW + 20%BA + 5%SF resist aggressive media attack and have a high corrosion index.
APPLIED SCIENCES-BASEL
(2021)
Article
Construction & Building Technology
Julian Eduardo Mejia-Ballesteros, Loic Rodier, Rafael Filomeno, Holmer Savastano, Juliano Fiorelli, Moises Frias Rojas
Summary: This study examines the effect of activated coal mining residues on the physical-mechanical properties of fiber cement composites, finding that partial substitution of cement and thermal treatment of the fibers contribute to improved mechanical performance and durability, especially after accelerated aging tests.
CEMENT & CONCRETE COMPOSITES
(2021)
Article
Chemistry, Physical
Raquel Vigil de la Villa Mencia, Moises Frias Rojas, Sagrario Martinez-Ramirez, Lucia Fernandez-Carrasco, Ernesto Villar Cocina, Rosario Garcia-Gimenez
Summary: The study analyzed the mixture of calcareous and siliceous CDW wastes from concrete and glass wastes, showing that the addition of recycled glass can modify the pozzolanic reaction of binary mixtures and form new mineral phases. This finding is important for improving waste utilization and waste treatment efficiency.
Article
Chemistry, Physical
Andres Juan-Valdes, Desiree Rodriguez-Robles, Julia Garcia-Gonzalez, Maria Isabel Sanchez de Rojas, Manuel Ignacio Guerra-Romero, Rebeca Martinez-Garcia, Julia M. Moran-del Pozo
Summary: The study evaluated precast kerbs and paving blocks made with recycled concrete, finding some strength indicators degraded but showing better performance in compressive strength, abrasion resistance classification, ensuring good durability. The results indicate the viability of mixed recycled aggregates and eco-efficient cementitious replacement in footways.
Article
Chemistry, Physical
Jaime Moreno-Juez, Laura Caneda-Martinez, Raquel Vigil de la Villa, Inigo Vegas, Moises Frias
Summary: This study compared the durability of ordinary Portland cement with ternary cements containing different blends of concrete waste fines and shatterproof glass. The experimental results showed that the blended mortars performed better in terms of porosity, but had higher water absorption and lower CO2 resistance. The inclusion of construction and demolition waste (CDW) enhanced the resistance. Overall, the mortars with and without CDW performed similarly, indicating the viability of using CDW for eco-efficient cements in the future.
Article
Chemistry, Physical
Divino Gabriel Lima Pinheiro, Matheus Ian Castro Sousa, Fernando Pelisser, Joao Henrique da Silva Rego, Amparo Moragues Terrades, Moises Frias Rojas
Summary: This article evaluates a ternary cement with 23% calcined clay and 2% nanosilica to replace 25% of Ordinary Portland Cement. Tests show that the ternary cement has a high surface area, accelerates silicate formation, and reduces hydration products. Additionally, a significant reduction in total porosity and the conversion of macropores into mesopores and gel pores were observed.
Article
Chemistry, Physical
Gabriel Lima Oliveira Martins, Yuri Sotero Bomfim Fraga, Andreia de Paula, Joao Henrique da Silva Rego, Amparo Moragues Terrades, Moises Frias Rojas
Summary: This research examines the effect of functionalized nanosilica (NSF) with different levels of amine groups on the formation of hydration products. The results show that NSF influences the hydration kinetics of the cement pastes, delaying the hydration of Portland cement. However, NSF exhibits similar mechanical performance to NS after 2 days of hydration, and a 10% increase in mechanical performance after 28 days of hydration due to improved hydration process. Therefore, the functionalization of NSF with a low content of APTES is promising for use in cementitious materials and can enhance hydration and mechanical performance at later stages compared to NS.
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)
