Construction and Building Materials最新文献

{"title":"Study on the mechanical and durability properties of 3D-printed bamboo fiber-reinforced concrete","authors":"Qi Si ,&nbsp;Wenna Zhang ,&nbsp;Zhihong Pan ,&nbsp;Jianqiang Zheng ,&nbsp;Chaomin Yu ,&nbsp;Guohe Zhang","doi":"10.1016/j.conbuildmat.2025.141464","DOIUrl":"10.1016/j.conbuildmat.2025.141464","url":null,"abstract":"<div><div>In the context of global efforts to promote low-carbon and green building materials, this study investigated the integration of bamboo fibers into 3D-printed concrete, aiming to develop a novel building material that combines high performance with sustainability. Bamboo fiber, as a natural, biodegradable, and renewable resource with a rapid growth cycle, offers a low-carbon alternative to synthetic fibers and contributes to sustainable development goals. This study explored the influence of varying bamboo fiber contents (0 %, 0.5 %, 1.0 %, 1.5 %, 2.0 %) and fiber lengths (20 mm, 40 mm, 60 mm) on the flexural strength, compressive strength, and durability of 3D-printed concrete. In the test, Portland cement was used with a water/cement ratio of 0.27, and a water-reducing admixture was added to ensure printability. Specimens were cured under standard conditions (20 ± 2°C, 95 % RH). The 3D printed process adopted a layer thickness of 10 mm and a printing speed of 50 mm/s. The three-point bending tests, uniaxial compression tests, and sulfate immersion tests were performed on the 3D-Printed bamboo fiber concrete specimens. The experimental results demonstrated that the incorporation of bamboo fibers significantly enhanced the mechanical properties of the 3D-printed concrete, particularly at a 1.5 % content and 40 mm fiber length, with flexural and compressive strengths increasing by 28.6 % and 19.3 %, respectively. However, lower fiber contents provided limited reinforcement, while excessive content or longer fibers increased anisotropy. Additionally, the incorporation of bamboo fibers mitigated the deterioration of concrete induced by sulfate erosion, particularly in terms of compressive strength. This improvement is attributed to the fibers' ability to bridge microcracks and reduce permeability, thereby limiting sulfate ingress. The findings of this study provide fundamental data for the application of 3D-printed bamboo fiber concrete, while also offering novel insights to advance the development of low-carbon and green building materials.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"478 ","pages":"Article 141464"},"PeriodicalIF":7.4,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation into the roles of camellia seed residue powder as a natural foaming agent and a green retarder for α-hemihydrate gypsum","authors":"Keshuang Li,&nbsp;Xiangyu Ji,&nbsp;Zhenhua Zheng,&nbsp;Yanzhi Meng,&nbsp;Yuze Zhang,&nbsp;Wenjuan Guo,&nbsp;Meishan Pei,&nbsp;Luyan Wang","doi":"10.1016/j.conbuildmat.2025.141453","DOIUrl":"10.1016/j.conbuildmat.2025.141453","url":null,"abstract":"<div><div>The feasibility of natural plant waste, camellia seed residue powder (CSRP), as an admixture for gypsum is investigate in this study. CSRP can function as a foaming agent when incorporated into α-hemihydrate gypsum (α-HH), and exhibits remarkable retarding effects during the hydration of α-HH. Experimental results indicate that CSRP-generated foam possesses high abundance and stability, particularly at a concentration of 24 % CSRP, with foam volume and half-life reaching up to 1560 mL and 1050 min, respectively. This superior performance is attributed primarily to the presence of the surfactant tea saponin in CSRP. Tea saponin molecules densely accumulate at the gas-liquid interface, significantly increasing surface density and forming cohesive interfacial films, and CSRP particles enhance bubble wall rigidity through physical reinforcement while their hydrophilicity maintains hydration shells around bubbles, synergistically prolonging foam lifetime. For CSRP-containing gypsum slurry, the fluidity and retarding time were tested and their results show that CSRP can reduce the fluidity and significantly prolong the setting time. At 2.5 % CSRP content, the final setting time of gypsum slurry is significantly extended to 197 min, meaning 183 min longer than that of blank gypsum. The role of CSRP in α-HH hydration was investigated through adsorption, conductivity, hydration heat, and XRD tests. The active organic components in CSRP, such as polyphenols, polysaccharides, and tea saponin, significantly delay the hydration process by complexing with calcium ions and forming an adsorption layer on the gypsum surface. Additionally, the foams generated by CSRP play a similar role by hindering the accumulation and growth of dihydrate nuclei. SEM images reveal that the incorporation of CSRP resulted in shorter and smaller dihydrate crystals in hardened gypsum, thereby corroborating the proposed mechanism. Furthermore, when the amount of CSRP is more than 1.2 %, gypsum products exhibit the porous characteristics as a lightweight material. The dry density of gypsum containing 1.6 % CSRP can be as low as 636 kg/m³, and the thermal conductivity is 0.2721 W/m·K, which is 60.27 % and 78.59 % lower than blank gypsum, respectively. In this work, CSRP, as an environmentally friendly admixture, can serve directly as both a foaming agent and retarder in gypsum without the need for additional treatment. The result also suggests an innovative recycling approach for solid plant waste CSRP.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"478 ","pages":"Article 141453"},"PeriodicalIF":7.4,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental investigation on the influence of rice straw characteristics on the hygric, thermal and mechanical properties of straw-lime concretes","authors":"Youssef El Moussi ,&nbsp;Laurent Clerc ,&nbsp;Jean-Charles Benezet","doi":"10.1016/j.conbuildmat.2025.141379","DOIUrl":"10.1016/j.conbuildmat.2025.141379","url":null,"abstract":"<div><div>The utilization of agricultural wastes in the construction sector has experienced impressive expansion due to the growing awareness of climate change. These materials provide a fascinating solution to reduce the energy demand and consequential carbon emissions, thanks to their attractive thermal, hygroscopic and environmental properties. In this context, the present study examines the impact of the characteristics of rice straw particles on the mechanical, hygric and thermal properties of straw concretes. The characterization of the concretes is mainly based on measurements of thermal conductivity, water vapor permeability, moisture buffering capacity, and mechanical properties. Several formulations are defined and tested by varying the type of straw particles and their sampling area on the stem. First, the impact of grinding process of rice straw on concretes incorporating these particles was evaluated. A comparison was made between concretes containing cut particles in the longitudinal direction with a tubular shape with concretes containing milled particles (flatter shape) of similar length. Then, the dependence of the physical and chemical properties of straw particles on their shape and sampling area on the stem is identified. The results showed that the properties of concretes are highly dependent on the shape and sampling area of straw particles. The dependence of the mechanical, thermal and hygric performances of concretes on the particles shape appears to be the most relevant parameter, while the variation in concrete performances based on sampling area is limited. Additionally, the results show that cut particles induce lighter and porous concretes compared to milled particles, leading to an attractive thermal conductivity, moisture buffering capacity and water vapor permeability, while decreasing the mechanical properties of concretes. It is also highlighted that particles extracted from the bottom of the stem exhibit excellent hygric properties, higher deformation capacity and lower thermal conductivity than particles from the top of the stem.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"478 ","pages":"Article 141379"},"PeriodicalIF":7.4,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of calcination temperature of industrial by-product gypsum on sulphoaluminate cement-based grouting material","authors":"Jie Ai ,&nbsp;Yanfen Wang ,&nbsp;Xiang Cheng ,&nbsp;Guangming Zhao ,&nbsp;Xiangrui Meng ,&nbsp;Shunjie Huang","doi":"10.1016/j.conbuildmat.2025.141455","DOIUrl":"10.1016/j.conbuildmat.2025.141455","url":null,"abstract":"<div><div>To enhance the resource utilization of industrial solid waste and promote the low-carbon and sustainable development of mining industry, an eco-friendly sulphoaluminate cement-based grouting material (EFSC) was prepared using industrial by-product gypsum (IPG), sulphoaluminate cement clinker and lime as raw materials. The effects of IPG calcined at different temperatures on working properties, compressive strength and microstructure characteristics of EFSC were investigated. Furthermore, the mechanical properties of the cemented specimens were evaluated using RMT and SEM in the grouting reinforcement experiment. Results showed that with the increase of IPG calcination temperature, the setting time and fluidity of EFSC were reduced. The expansion rate and compressive strength showed a positive correlation with IPG calcination temperature. Especially when the calcination temperature reached 700 °C, its compressive strength was 14.5 MPa at 6 h, which was 27.62 times that of the control group. Microscopic characterizations confirmed that the calcined IPG contributed to the formation of anhydrite in EFSC. Meanwhile, a large number of AFt and amorphous hydration products formed a dense network structure, improving the matrix density. In the grouting reinforcement test, the mechanical load-bearing capacity and plastic deformation of the coal gangue cemented specimens were improved significantly at IPG calcination temperatures of 700 °C and 800 ℃, with compressive strength increasing by 59.70 % and 71.82 %. The excellent mechanical performance could be attributed to the interface bonding property caused by needle-like AFt. This study provides innovative insights into the use of industrial solid waste as a partial replacement for cementing materials, which is expected to promote the sustainable development of green mining.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"478 ","pages":"Article 141455"},"PeriodicalIF":7.4,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of foaming gas on the physical and mechanical properties of foamed concrete","authors":"Dong Wu ,&nbsp;Yuan Zhang ,&nbsp;Shubin Qin ,&nbsp;Rongqin Deng","doi":"10.1016/j.conbuildmat.2025.141465","DOIUrl":"10.1016/j.conbuildmat.2025.141465","url":null,"abstract":"<div><div>Foamed concrete has been widely applied in the construction field due to its excellent thermal insulation performance. Different foaming gases have an impact on the physical and mechanical properties of foamed concrete. Most of the existing research focuses on the regulation of the thermal insulation performance of foamed concrete by foaming gases, but there is still a lack of systematic understanding of the influence mechanism on key physical properties such as its mechanical strength. This study has been carried out to investigate the effect of foaming gas on the physical properties of foamed concrete. Using the physical foaming method, sulfoaluminate cementitious foamed concrete was produced with carbon dioxide (CO₂), nitrogen (N₂), and Air as foaming agents. The resulting foamed concrete samples were tested and analyzed for various physical properties, including water absorption, softening coefficient, compressive strength, tensile strength, thermal conductivity, and porosity characteristics. The results demonstrate that CO₂ foamed concrete (CFC) exhibits superior water resistance, characterized by a lower water absorption rate and a softening coefficient that displays an inverse dependence. Regarding mechanical properties, while CFC possesses enhanced mechanical capabilities, its peak strength is reached later compared to N₂ foamed concrete (NFC) and Air foamed concrete (AFC). In terms of thermal insulation performance, CFC offers improved thermal insulation, and its incorporation of a lower thermal conductivity gas allows for the production of foam concrete with reduced thermal conductivity. Analysis of the stomatal structure and the composition of hydration products indicated a relative scarcity of tandem and deformed pores in CFC, highlighting a finer stomatal structure and an increased presence of calcium carbonate within the hydration products. At an equivalent density level, foamed concrete produced using CO₂ as the foaming agent demonstrates superior water resistance, mechanical properties, and thermal insulation, with the mechanical and thermal insulation properties showing an inverse dependence relationship. Given its advantageous physical properties, along with its potential for carbon sequestration and emissions reduction, CFC presents promising prospects for practical applications.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"478 ","pages":"Article 141465"},"PeriodicalIF":7.4,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recycled concrete paving block waste as a selected sustainable substitute for natural aggregate in cement composites","authors":"Jan Pizoń ,&nbsp;Kateřina Matýsková ,&nbsp;Marie Horňáková ,&nbsp;Małgorzata Gołaszewska ,&nbsp;Gabriela Kratošová","doi":"10.1016/j.conbuildmat.2025.141356","DOIUrl":"10.1016/j.conbuildmat.2025.141356","url":null,"abstract":"<div><div>This study examines the impact of replacing natural aggregates with second-quality sorted concrete paving block (CPB) aggregates in mortars and concretes. Substitution levels varied from 0 % to 100 % for fine aggregates in mortars and 50 % for fine and/or coarse aggregates in concretes. The research analysed the properties of the waste material, including particle size distribution, porosity, water absorption, and density. For mortars and concretes, the evaluated parameters encompassed workability, consistency, density, compressive strength, electrical resistivity, and microstructure. The findings indicate that mortars incorporating CPB aggregates necessitate higher dosages of superplasticizers to achieve desired workability. This requirement is attributed to the increased cement content per unit volume and the finer particle size of the recycled aggregates. Early compressive strength of mortars peaks at a 50 % recycled aggregate content due to a reduced effective water-to-cement ratio, while 100 % substitution of fine aggregate leads to a significant decrease in compressive strength. Concretes with recycled aggregates exhibit comparable or superior early compressive strength relative to reference concrete, but after 28 days, all concretes with recycled aggregates display lower strength. The 28-day compressive strengths are 65.9 MPa, 64.8 MPa, and 62.3 MPa for 50 % replacement by fine, coarse, and a combination of both aggregates, respectively. These results surpass those achieved in similar studies. Durability assessments suggest that concrete mixtures with CPB exhibit trends comparable to reference concrete, indicating moderate resistance to chloride penetration. Overall, the findings suggest that utilizing sorted CPB aggregates is a viable approach to replacing natural aggregates in mortars and concretes.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"478 ","pages":"Article 141356"},"PeriodicalIF":7.4,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Activation preparation of waste tire pyrolytic carbon black and its reinforcing application in modified asphalt","authors":"Youwei Gan ,&nbsp;Qinhao Deng ,&nbsp;Chuangmin Li ,&nbsp;Yuanyuan Li ,&nbsp;Anqi Chen ,&nbsp;Duo Wu ,&nbsp;Suhong Zhu ,&nbsp;Fuming Liu","doi":"10.1016/j.conbuildmat.2025.141440","DOIUrl":"10.1016/j.conbuildmat.2025.141440","url":null,"abstract":"<div><div>Pyrolytic carbon black (PCB) has been shown to improve the performance of asphalt, but its use in modified asphalt often results in poor low-temperature behavior, fatigue resistance, and compatibility. This study explores four activation strategies (HCl, KOH, steam, CO₂) to enhance the performance of PCB-modified asphalt. PCB's physical and chemical properties were characterized by ash content measurements, scanning electron microscopy (SEM), and nitrogen adsorption. Among these, HCl activation enhanced compatibility, low-temperature crack resistance, and fatigue resistance of PCB-modified asphalt. KPCB-A demonstrated a 3.1°C improvement in high-temperature failure temperature compared to PCB-A. Steam activation maximized fatigue resistance (196 million cycles at 1 % strain) through mesopore-dominated structures. CO₂ activation, which does not alter PCB's chemical properties, yields similar performance to HCl activation. Fluorescence microscopy (FM) and image analysis revealed that the increased specific surface area of activated PCB correlated with improved asphalt compatibility. The increased pore volume enhanced PCB's adsorption potential, and chemical activation (compared to physical activation) further enhanced the adsorption of light components. This study quantified the performance trade-offs of different activation methods, revealed the linkage between PCB pore structure and the performance of modified asphalt, and advanced the sustainable reuse of PCB in asphalt pavements.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"478 ","pages":"Article 141440"},"PeriodicalIF":7.4,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of microfibers and cenospheres on the interfacial performance between steel fiber and multi-scale fiber reinforced UHPC subjected to high temperatures","authors":"Yao Zhang ,&nbsp;Zihan An ,&nbsp;Yichao Wang ,&nbsp;Zhongzheng Guan ,&nbsp;Weigang Zhao ,&nbsp;Qing Chen ,&nbsp;Zhiguo Yan","doi":"10.1016/j.conbuildmat.2025.141435","DOIUrl":"10.1016/j.conbuildmat.2025.141435","url":null,"abstract":"<div><div>To enhance the ductility of traditional ultra-high-performance concrete (UHPC), a strategy involves incorporating multi-scale fibers into UHPC. This aims to restrict crack propagation at different scales, consequently enhancing the material's ductility. Despite these advancements, the mechanism governing the cracking resistance of the newly developed multi-scale fiber reinforced UHPC (MSFUHPC) subjected to elevated temperatures remains unclear, particularly the interfacial bonding properties between steel fibers and MSFUHPC. Therefore, eighteen distinct mixture proportions are employed to systematically investigate the impact of microfibers—specifically carbon fibers, calcium sulfate whiskers, and cenospheres on the interfacial bond properties of steel fiber-MSFUHPC subjected to various temperature levels by a single factor test in this study. Specifically, a novel fiber pullout test method is employed to accurately measure fiber displacement by using digital imaging correlation technology. In addition, electron computed tomography scans and scanning electron microscopes are utilized to analyze the influence of microscopic fibers on the internal composition of MSFUHPC. Experimental findings demonstrate that carbon fibers can enhance the interfacial bond strength between MSFUHPC and steel fibers, thereby improving the mechanical properties of MSFUHPC subjected to different temperatures. Meanwhile, adding calcium sulfate whiskers with a proper dosage can improve the compressive strength of MSFUHPC at room temperature, but exhibit contrasting effects at elevated temperatures. In addition, the blend of 1 % CSW and 0.4 % CF or 0.8 % CF yields the best mechanical properties and interfacial bond performance, which is more obvious after exposure to 400 °C. Besides, the toughness index can be increased by about 80 % and average pullout strength can be almost doubled in comparison with that of the control group at 400 °C. Although adding cenospheres slightly diminishes mechanical properties, it can mitigate the negative effect of the excessive fiber dosage on compressive strength.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"478 ","pages":"Article 141435"},"PeriodicalIF":7.4,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Degradation mechanism of cast-in-situ concrete under long-term sulfate saline soil attack","authors":"Bo Yang ,&nbsp;Xiaopeng Hu ,&nbsp;Aoyang Li ,&nbsp;Tiansong Zhao ,&nbsp;YuanQing Sun ,&nbsp;Hao Fu","doi":"10.1016/j.conbuildmat.2025.141401","DOIUrl":"10.1016/j.conbuildmat.2025.141401","url":null,"abstract":"<div><div>This study investigates the degradation mechanism of cast-in-situ concrete under long-term exposure to sulfate saline soil environments. By designing influencing factors of different salt concentrations (5 %, 10 %, and 15 %), water-to-cement ratios (0.3, 0.4, and 0.5), and cement types (OPC, MSRC, and HSRC), the study examines the appearance deterioration, macroscopic performance degradation, phase composition, microstructural features, and pore structure changes of cast-in-situ concrete under long-term saline soil attack. The results reveal that sulfate attack and the dissolution-leaching of calcium-rich phases are the primary mechanisms driving concrete degradation in saline soils. Notably, higher salt concentrations accelerate degradation processes, making them faster and more localized. Long-term exposure to saline soils causes the porosity of concrete to first decrease and then increase, with significant changes in pore distribution characteristics, and the gel pore growth rate reaching 195.31 %-865.45 %. Microstructural observations further reveal the formation of stratified zones in the concrete, progressing inward from the surface. These zones include a calcite crust, a porous layer, a corrosion product enrichment layer, and a complete area.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"478 ","pages":"Article 141401"},"PeriodicalIF":7.4,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Augmented photocatalytic efficiency stemming from porous core-shell structure: A synergistic manifestation of nano-TiO2 and Fe2O3-enriched recycled clay brick aggregates as hosting matrix","authors":"Xue-Fei Chen ,&nbsp;Xiangping Xian ,&nbsp;Wei-Zhi Chen ,&nbsp;Binmeng Chen","doi":"10.1016/j.conbuildmat.2025.141395","DOIUrl":"10.1016/j.conbuildmat.2025.141395","url":null,"abstract":"<div><div>In this study, a pioneering methodology is delineated, wherein Fe₂O₃-enriched recycled red brick aggregates are harnessed as avant-garde carrier substrates, resulting in a profound enhancement of the intrinsic self-cleansing capabilities of TiO₂. The innate porous core-shell architecture of these recycled aggregates engenders a notable synergistic interaction between nano-TiO₂ and Fe₂O₃, culminating in a marked escalation of photocatalytic efficiency. An exhaustive examination of the degradation proficiency across a spectrum of samples against methyl blue, conducted over a gradient of temporal intervals, has been executed. The findings indicate that the rates of degradation for all samples increase progressively with the prolongation of exposure to UV irradiation. The control group, consisting exclusively of white cement, demonstrated the most diminutive degradation rate, achieving merely a 4 % reduction in methyl blue concentration through UV irradiation alone. Conversely, the nano-TiO2-modified recycled grey brick aggregate (NT-RGBA) and recycled red brick aggregate (NT-RRBA) samples showcased substantially elevated degradation rates, a phenomenon attributable to the incorporation of photocatalytic agents capable of capitalizing on UV energy to expedite the degradation process of methyl blue. The NT-RRBA composite, an amalgamation of the photocatalytic attributes of TiO₂, the synergistic interplay between Fe₂O₃ and TiO₂, and the intricate three-dimensional pore framework of RRBA, manifested the most pronounced degradation rate. To delve deeper into the determinants influencing the efficacy of photocatalytic degradation, a fuzzy inference system has been deployed to construct a mathematical model that scrutinizes the effects of variables such as the initial concentration of pollutants and the flow rate. This quantitative methodology affords to establish a functional relationship that encapsulates the underlying dynamics of the photocatalytic degradation phenomenon. Deploying this functional material, a derivative of construction detritus, paves the way for an innovative strategy of closed-loop resource utilization, marking a significant milestone towards sustainable development within the construction sector.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"478 ","pages":"Article 141395"},"PeriodicalIF":7.4,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}