Article
Green & Sustainable Science & Technology
Xiao Wang, Haowen Jing, Maoliang Zhang, Jianwei Li, Yan Ma, Liang Yan
Summary: This study investigated the content and occurrence states of washable alkali, removable alkali, and lattice alkali in Bayer red mud, as well as the potassium and sodium removal mechanism. The results revealed that sodium was mainly deposited in the shelf silicon voids of hydroxy sodalite in the form of Si-O-Na or Al-O-Na, while potassium was deposited in the shelf silico-oxygen voids of potassium feldspar in the form of Si-O-K or Al-O-K. The washable alkali contents of sodium and potassium in the mud were 13.7% and 4.47% respectively, and the alkali removal agent CaO removed 83.1% and 50.8% of sodium and potassium in the red mud.
Article
Construction & Building Technology
Qingwei Wang, Song Han, Junhao Yang, Xiaoyang Lin, Mingzhe An
Summary: This study focuses on the reactivity and reaction mechanisms of Bayer red mud (BRM) in cement-based and geopolymer materials. It was found that BRM exhibits relatively low reactivity in cement-based material but has a certain level of reactivity in geopolymer materials. Furthermore, high-temperature activation was found to affect the reactivity of BRM. The study provides a reliable, affordable, and efficient method for the bulk utilization of BRM.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Hang Yin, Jiepeng Liu, Xuhong Zhou, Hongtuo Qi, Shuxian Liu, Shuai Pang
Summary: Polypropylene fiber was added to alkali slag-red mud geopolymer (AS-RG) to improve its flexural performance. Three-point bending tests were conducted on fiber-reinforced AS-RG under different conditions, and structural performance improvement and control tests of composite materials were carried out. Microscopic analysis using scanning electron microscope (SEM) and X-ray diffraction (XRD) revealed the ductility strengthening mechanism of composites. Numerical simulations using particle flow numerical simulation software (PFC3D5.0) explained the crack evolution law during the three-point bending failure of the specimen. The study found that adding a proper amount of polypropylene fiber effectively improved the flexural strength of AS-RG, and the ability to resist instability and failure increased with the increase of fiber length but decreased with the increase of water-binder ratio. The combination of 9 mm fiber length, 4 parts per thousand fiber content, and 0.26 water-binder ratio had the best effect on improving the fracture performance of the material.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Kaige Tian, Yanshuai Wang, Biqin Dong, Guohao Fang, Feng Xing
Summary: In this study, alkali-activated slag/red mud (AASR) pastes were prepared using sodium silicate as the alkali activator. The effects of Bayer red mud (RM) on the engineering and micro-properties of alkali-activated slag pastes were investigated. The results showed that an appropriate amount of RM delayed the gel coagulation of AASR pastes, resulting in decreased fluidity and increased setting time. Additionally, it was found that RM could promote the alkali-activated reaction of slag and enhance the compressive strength of the hardened AASR paste.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Green & Sustainable Science & Technology
Alessio Occhicone, Mira Vukcevic, Ivana Boskovic, Claudio Ferone
Summary: The aluminum Bayer production process is widely used. By mixing red mud and blast furnace slag, alkali-activated materials with high compressive strength can be obtained. These mixtures have minimal environmental impact and can be used as alternative materials in the construction industry.
Article
Construction & Building Technology
Ndigui Billong, Jonathan Oti, John Kinuthia
Summary: The study investigated the effectiveness of using silica fume based sodium silicate in the production of geopolymers from metakaolin and ground granulated blast furnace slag. The results showed that silica fume based sodium silicate performed similarly or slightly better in physical, mechanical, and thermo-gravimetric properties compared to commercial sodium silicate. The research also highlighted the sustainability potential of using undensified silica fume as raw material for sodium silicate production.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Review
Construction & Building Technology
Aman Kumar, T. Jothi Saravanan, Kunal Bisht, K. I. Syed Ahmed Kabeer
Summary: The production of ordinary Portland cement has harmful effects on the environment, leading to the utilization of industrial waste products to synthesize geopolymer materials and alkali-activated binders as an alternative. Red Mud, a harmful radioactive waste material, can be used in the synthesis of these materials, providing better environmental stability.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Environmental Sciences
Shengnan Lin, Tingan Zhang, Boran Zhang, Xi Chao
Summary: Bayer red mud is a solid waste generated during the production of alumina by the Bayer process. The stock of red mud in China is over 1.1 billion tons, covering an area of more than 120,000 mu, and the annual production volume is increasing. The comprehensive utilization of red mud is still a difficult problem, and actively exploring new methods for removing sodium from red mud is of great significance. This study combines the traditional red mud desalination process with the slurry electrolysis process to explore the influence of different leaching agents on the leaching and sodium removal of red mud slurry in the presence of an electric field. Experimental results show that the red mud leached with pure dilute hydrochloric acid has the highest sodium removal rate.
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Juntong Li, Qing Li, Ping Chen, Kai Yao, Penghuai Wang, Yang Ming, Jin Yi, Lili Zhi
Summary: In this study, Bayer red mud and ground granulated blast furnace slag were used to form alkali-activated cementitious materials (AASR) with different ratios. The effect of red mud content on the mechanical properties of AASR was analyzed by studying the compressive strength. Various testing techniques were used to reveal the influence mechanism of red mud content on the mechanical properties. The results show that the increase of red mud content leads to a decrease in compressive strength by affecting the porosity and hydration reaction process.
APPLIED SCIENCES-BASEL
(2023)
Article
Construction & Building Technology
Zhaofeng Li, Xiaolin Liu, Yifan Gao, Jian Zhang
Summary: This paper investigated the geopolymerization mechanism of Bayer red mud-based geopolymer engineered cementitious composites under different preparation parameters using low field nuclear magnetic resonance, rheometer, isothermal calorimeter, and other means. The results showed that the compressive strength of the composites increased and then decreased when the modulus of the activator was lower than 1.5 M, and the compressive strength decreased with the increase of red mud dosage. The research results promoted the application of Bayer red mud-based geopolymer engineered cementitious composites and improved the resource utilization efficiency of red mud and other solid wastes.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Umme Zakira, Kai Zheng, Ning Xie, Bjorn Birgisson
Summary: This study investigates the potential use of red mud as a raw material in the development of high-strength geopolymers. Two different mixing procedures were adopted while activating the raw ingredients using a sodium hydroxide and sodium silicate solution. The performance of the formed geopolymers was enhanced by adding silica fume as an additive. The synthesized geopolymers achieved extraordinary early compressive strength as high as 68.8 MPa and a high proportion of red mud, 50% by weight, could be utilized achieving a strength of 66 MPa.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Physical
Aref A. Abadel, Hussam Alghamdi, Yousef R. Alharbi, Mohammed Alamri, Mohammad Khawaji, Mohammed A. M. Abdulaziz, Moncef L. Nehdi
Summary: This study investigated the production process of eco-efficient alkali-activated slag-based samples using recycled construction cementitious materials (RCCM) and red mud (RM). The findings showed that when a high quantity of dehydrated cement powder (DCP) and red mud were used, the strength and durability of the specimens improved significantly. It was concluded that DCP and RM could be potential sustainable binder substitutes, allowing waste valorization and reducing negative environmental impact.
Review
Construction & Building Technology
Mohammed Fouad Alnahhal, Taehwan Kim, Ailar Hajimohammadi
Summary: This study presents advancements in synthesizing alternative sodium silicate activators using silica-rich waste resources. Different silicate extraction methods were compared and their effects on silica dissolution rate discussed. The synthesized activators were rigorously evaluated for efficiency control factors, showing that hydrothermal and thermochemical processes are effective in silica extraction. Proper selection of raw materials and extraction conditions can maximize silica yield from waste, providing mechanical and microstructural properties of AAMs comparable to commercially available activators.
CEMENT & CONCRETE COMPOSITES
(2021)
Article
Construction & Building Technology
Xiaodi Dai, Serdar Aydin, Mert Yucel Yardimci, Karel Lesage, Geert De Schutter
Summary: The research found that silica fume and sodium silicate-based activators have different effects on the properties of alkali-activated slag cement, with silica fume activated mixtures exhibiting better workability and lower drying shrinkage, as well as slightly higher mechanical properties compared to sodium silicate activated mixtures.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Construction & Building Technology
Jiarui Liu, Jeung-Hwan Doh, Dominic E. L. Ong, Hong Lich Dinh, Zak Podolsky, Goangseup Zi
Summary: The use of red mud as an aluminosilicate precursor for geopolymer production is attracting research interest due to its potential as a sustainable solution for waste valorization. However, the effect of red mud and its caustic residue on geopolymerization is still uncertain. This study investigates the potential of using red mud supplied from a local alumina refinery and compares the performances of traditional fly ash-based geopolymer and red-mud-fly-ash-based geopolymer under different NaOH concentrations.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Engineering, Environmental
Sijing Chen, Zhen Li, Longsheng Wu, Lu Liu, Jingping Hu, Huijie Hou, Sha Liang, Jiakuan Yang
Summary: Hemin has attracted attention as an efficient catalyst, but molecular aggregation limits its direct application. Immobilizing hemin on multiwalled carbon nanotubes (CNTs) through ball milling was done to address this issue. The CNTs-hemin catalyst showed significantly improved performance in the peroxymonosulfate system, with a 650-fold increase in the apparent rate constant and 97.8% degradation of sulfathiazole in 5 minutes. The dominant reactive species in the CNTs-hemin/peroxymonosulfate system were proposed to be high-valent iron-oxo porphyrin cation ((Porp)+???FeIV=O) radicals. Electron transfer between CNTs and hemin promoted the generation of these radicals. This research enriches the understanding of supported biomimetic catalysts for PMS activation and highlights the role of support materials in catalytic activity.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Chemistry, Physical
Dongliang Wang, Jingping Hu, Junjie Wei, Xianli Liu, Huijie Hou
Summary: Nitrogen-doped carbons (N/Cs) exhibit excellent catalytic performance for oxygen reduction reaction (ORR) in fuel cell systems, but the role of active sites within N/Cs remains controversial. In this study, ORR tests were conducted on three different N/Cs in an O-2-saturated KOH aqueous solution, revealing a significant linear correlation between the graphitic nitrogen content and ORR activity. Theoretical calculations showed that graphitic nitrogen doping is energetically more favorable than pyridinic nitrogen doping for ORR, with pyridinic nitrogen favoring a 2 e(-) ORR pathway. These findings highlight the key role of graphitic nitrogen in mediating ORR activity in N/Cs. This work provides a solid foundation for identifying active sites in heteroatom-doped carbons and can contribute to the rational design and engineering of effective carbon-based ORR catalysts.
Article
Engineering, Environmental
Wenhao Yu, Mingyang Li, Sha Liang, Qi Xu, Peiyuan Zhang, Huijie Hou, Jingping Hu, Jiakuan Yang
Summary: For the first time, a one-step spray pyrolysis process has been investigated in the recycling of spent lead-acid batteries (LABs). The process involves desulfurizing the spent lead paste to obtain lead acetate (Pb(Ac)2) solution, which is then sprayed into a tube furnace for pyrolysis to produce lead oxide (PbO). Under optimized conditions, a low-impurity lead oxide product with better performance than commercial lead oxide powder was obtained. This study provides a strategy for the short-route recovery of spent LABs.
Article
Engineering, Environmental
Ye Chen, Yan Ke, Sha Liang, Jingping Hu, Huijie Hou, Jiakuan Yang
Summary: This study proposes a co-pyrolysis process using Bayer red mud (RM) to upgrade non-metallic fractions (NMFs) from WPCBs. The process achieves high bromine fixation efficiency and obtains a higher content of lightweight pyrolysis tar. Experimental and theoretical calculations investigate the mechanism of catalytic pyrolysis and simultaneous bromine fixation of NMFs by RM, with Fe2O3, CaCO3, and Al2O3 being identified as key components. The addition of 15 wt% RM enables the fixation of 89.55 wt% bromine, compared to 35.42 wt% without RM, due to the formation of FeBr2 and CaBr2. The lightweighting of tar is achieved by reducing the energy barrier of TBBPA decomposition, with Fe2O3 having the greatest effect. The content of lightweight tar in the catalytic pyrolysis of NMFs with 15 wt% RM is 44.29% higher compared to direct pyrolysis. This work provides guidance for the low-cost and eco-friendly recycling of e-wastes using co-pyrolysis with RM.
Article
Engineering, Environmental
Liang Yang, Xiao Guo, Sha Liang, Fan Yang, Mingxuan Wen, Shushan Yuan, Keke Xiao, Wenbo Yu, Jingping Hu, Huijie Hou, Jiakuan Yang
Summary: In this study, a sustainable strategy for P recovery from sewage sludge was proposed. It involved alkali-activated pyrolysis, water leaching, and crystallization processes, resulting in the recovery of a high value-added product called vivianite. The effects of alkali activator type and dose on P transformation during sludge pyrolysis were investigated, and a dose of 50 wt% KHCO3 was determined as the optimal condition. The study demonstrated that KHCO3-activated pyrolysis significantly increased the water-soluble P content in the biochar derived from ferric sludge, leading to the recovery of vivianite with a high purity through crystallization. A total P recovery efficiency of 88.08% was achieved throughout the process, indicating the promising potential of this approach.
Article
Environmental Sciences
Bei Ou, Hui Wang, Keke Xiao, Yuwei Zhu, Yuan Liu, Sha Liang, Huijie Hou, Wenbo Yu, Jingping Hu, Jiakuan Yang
Summary: The potential synergistic effects of iron-rich biochar and Pseudomonas aeruginosa (PA) in reducing Cr(VI) were systematically explored in this study. The results showed that the biochar produced at 300°C (Fe-300) was more efficient at reducing Cr(VI) than that produced at 800°C (Fe-800), and the presence of PA further enhanced its performance. The synergistic effects were mainly attributed to the increased release of phosphorus from Fe-300 by PA and the proteins extracted from PA.
Article
Chemistry, Physical
Tao Shen, Sijing Chen, Shuang Wang, Xiao Huang, Min Song, Xu Zhao, Jingping Hu, Deli Wang
Summary: In this study, surface and composition engineering strategies were integrated by constructing atomically ordered Rh0.9Pt0.1Fe ternary intermetallic (O-Rh0.9Pt0.1Fe). It was found that the carbon monoxide (CO*) mediated indirect formic acid oxidation reaction (FAOR) pathway on pure Rh was switched into a direct pathway on RhFe intermetallics (O-RhFe) with isolated Rh atoms, resulting in a lower overpotential. Further composition engineering by forming O-Rh0.9Pt0.1Fe contributed to enhanced FAOR activity. This study provides new insight into tuning reaction pathways and catalytic activity selectively via tailoring adsorption of different intermediates.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Environmental Sciences
Lu Liu, Anqi Wang, Jingping Hu, Huijie Hou, Sha Liang, Jiakuan Yang
Summary: The activation of peroxymonosulfate (PMS) by sodium ferric chlorophyllin (SFC) was investigated for efficient degradation of bisphenol A (BPA). The SFC/PMS system showed a remarkable ability to degrade BPA, achieving a degradation rate of 97.5% in the first 10 minutes, while conventional Fe2+/PMS only removed 22.6% of BPA under the same conditions. The study identified nonradical oxidation species, including high-valent iron-oxo porphyrin species and 1O2, as the dominant species in the reaction. The proposed natural porphyrin derivative, SFC, exhibited a broad pH range and high tolerance towards inorganic anions, making it a promising candidate for wastewater treatment.
Article
Electrochemistry
Longsheng Wu, Jingping Hu, Sijing Chen, Xiaorong Yang, Lu Liu, John S. Foord, Paulius Pobedinskas, Ken Haenen, Huijie Hou, Jiakuan Yang
Summary: A stable solid electrolyte interphase (SEI) is crucial for the cyclic stability and Coulombic efficiency (CE) of lithium-sulfur (Li-S) batteries. This study reveals the mechanism of LiNO3 additive in mediating the dynamic evolution of SEI on a lithium anode surface using in situ Fourier transform infrared (FTIR) spectroscopy and ab initio molecular dynamics (AIMD). LiNO3 accelerates the reduction of LiTFSI, forming a compact and stable SEI, which hinders the decomposition of LiTFSI and the solvent during lithium deposition stripping, leading to higher CE and long-term cyclic stability.
ELECTROCHIMICA ACTA
(2023)
Correction
Engineering, Environmental
Sijing Chen, Zhen Li, Longsheng Wu, Lu Liu, Jingping Hu, Huijie Hou, Sha Liang, Jiakuan Yang
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Neurosciences
Xiaoyue Li, Jingping Hu, Xiangyang Zang, Jibin Xing, Xingying Mo, Ziqing Hei, Chulian Gong, Chaojin Chen, Shaoli Zhou
Summary: ECT performed under general anesthesia is an effective treatment for severe depression. This study found that the intravenous anesthetic propofol may have an impact on the effectiveness of ECT.
MOLECULAR NEUROBIOLOGY
(2023)
Review
Engineering, Environmental
Yan Ke, Ye Chen, Sha Liang, Jingping Hu, Huijie Hou, Junda Quan, Xingwu Li, Huabo Duan, Shushan Yuan, Jiakuan Yang
Summary: The global generation of industrial solid waste (ISW) reaches billions of tons annually. However, due to its low recycling efficiency and accompanying environmental pollution, it is difficult to directly utilize ISW on a large scale. Improper disposal of ISW in many developing countries leads to serious pollution to the air, water, and soil environment. In this study, a systematic review was conducted on the recycling and pollution control of major ISW. A bi-tetrahedron model was proposed based on the fundamental central paradigm of materials science and engineering to promote sound ISW management.
RESOURCES CONSERVATION AND RECYCLING
(2023)
Article
Engineering, Environmental
Qian Zhu, Dingkang Qian, Mengjiao Yuan, Zhen Li, Ziming Xu, Sha Liang, Wenbo Yu, Shushan Yuan, Jiakuan Yang, Huijie Hou, Jingping Hu
Summary: Electrogenic biofilms in microbial electrochemical systems play important roles in simultaneous wastewater treatment and energy recovery. This research investigated the coordination between intracellular c-di-GMP signaling and reinforced quorum sensing on the formation of mixed-cultured electrogenic biofilm under disruption of electrical signaling. The study revealed that intracellular c-di-GMP was reinforced in response to the disruption, and the dominant DGC induced biofilm formation by mediating exopolysaccharide synthesis. Additionally, reinforced quorum sensing could benefit the biofilm restoration. The study proposed a potential strategy for electrogenic biofilm regulation from the perspectives of cell-to-cell communication.
Article
Environmental Sciences
Qianqian Wen, Yuan Liu, Wenbo Yu, Qian Zhu, Yuwei Zhu, Shijie Bian, Xintai Su, Keke Xiao, Sha Liang, Shushan Yuan, Huijie Hou, Jingping Hu, Jiakuan Yang
Summary: The chemical compounds in sludge dewatered filtrates can cause unexpected stress on the biological treatment process of wastewater treatment plants. This study evaluated the performance of sludge dewatering with different conditioners and detected the stress of the dewatered filtrate on microbial activity using microbial fuel cells. The recommended dewatered filtrates were from Fe2+/H2O2 and Fe2+/Ca(ClO)2 conditioning, with voltage inhibition ratios of only 24.28% and 31.58% when the MFC substrate was 100% filtrate. However, the voltage inhibition ratios increased to 70.33% and 90.33% when the MFC substrates were 50% filtrate from Fe2+/PDS and Fe3+/CaO conditioning. This study highlights the importance of considering the impact of dewatered filtrate on wastewater treatment plants.
Article
Environmental Sciences
Qianqian Wen, Yuan Liu, Wenbo Yu, Qian Zhu, Yuwei Zhu, Shijie Bian, Xintai Su, Keke Xiao, Sha Liang, Shushan Yuan, Huijie Hou, Jingping Hu, Jiakuan Yang
Summary: This study evaluated the performance of sludge dewatering with different conditioners and detected the stress of the dewatered filtrate on the microbes using microbial fuel cells (MFCs). Dewatered filtrates from Fe2+/H2O2 and Fe2+/Ca(ClO)2 conditioning were recommended, with voltage inhibition ratios of only 24.28% and 31.58% when the MFC substrate was 100% filtrate. However, voltage inhibition ratios reached 70.33% and 90.33% when the MFC substrates were 50% filtrate from Fe2+/PDS and Fe3+/CaO conditioning. The high pH (>12) of the Fe3+/ CaO conditioning filtrate and the remaining oxidation reagent in the Fe2+/PDS conditioning filtrate significantly increased damaged cell ratios at anodic biofilms, indicating negative impacts on microbial activity. This study provides a reference for the impact of dewatered filtrate on wastewater treatment plants (WWTPs).
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)
