Developments in the Built Environment最新文献

{"title":"Nano-TiO₂-treated recycled aggregate-based photocatalytic mortar: Efficient NOx removal and mathematical modeling across diverse operational scenarios","authors":"Xue-Fei Chen ,&nbsp;Xiu-Cheng Zhang ,&nbsp;Xiangping Xian ,&nbsp;S Thomas Ng","doi":"10.1016/j.dibe.2025.100604","DOIUrl":"10.1016/j.dibe.2025.100604","url":null,"abstract":"<div><div>Nano-TiO₂-treated (NT) recycled concrete aggregates (RA) were successfully integrated into the built environment by producing green photocatalytic mortar. Employing various microstructural characterization techniques, it was revealed that the old mortar layer of the RA possessed a porous surface structure, providing a significant specific surface area conducive to effective NT loading. A stable Ti-O-Si chemical bond was established between the surface of the RA and the NT through a hydroxylation treatment process, ensuring the durability of the green photocatalytic mortar during its manufacture and deployment within the built environment. This innovative mortar demonstrated an exceptional NOx removal efficiency of c.a. 90.75%. A predictive model was developed using the Back Propagation Neural Network, integrating experimental and theoretical data to optimize mortar performance across various scenarios. The findings mark a significant advancement in using RA in construction, contributing to sustainable development in the built environment.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"21 ","pages":"Article 100604"},"PeriodicalIF":6.2,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rheology, mechanical properties and microstructure characterization of limestone calcined clay cement (LC3) incorporated sustainable lightweight self-compacting concrete","authors":"Snigdhajit Mukherjee ,&nbsp;Rajesh Kumar ,&nbsp;Monalisa Behera ,&nbsp;Arpit Goyal ,&nbsp;Md Reyazur Rahman","doi":"10.1016/j.dibe.2025.100601","DOIUrl":"10.1016/j.dibe.2025.100601","url":null,"abstract":"<div><div>In recent years, there has been growing interest in the possibility of achieving zero-emission goals using environmentally friendly building materials. Significantly, the concrete industry utilizes numerous alternatives as supplementary cementitious materials (SCMs) for development in construction sector. The integrity of these materials has the potential to alter the rheological properties of fresh concrete with ease of their chemical reactivity over time. The physico-chemical behavior of limestone calcined clay cement (LC³) and lightweight expanded clay aggregate (LECA) provides significant information about the intrinsic material characteristics including rheological attributes, of novel lightweight self-compacting concrete (LWSCC) of a target strength of 25 MPa. Primarily, the ease of flow in concrete is governed by the thixotropy and rheological parameters under dynamic motion. Secondarily, the perfect flow model is essential for determining the change in non-linearity in the mixes, leading to shear thickening. Therefore, the overall rheological behavior was determined through slump flow, L-box, U-box, V funnel, and shear flow curve tests using a coaxial vane rheometer with the help of Reiner-Riwlin (R-R) equations. Herschel-Bulkley (H-B) and Modified Bingham (M − B) equations numerically validates non-linearity with flow index (n) ranging between 1.52 and 1.79 with c<strong>/</strong>μ &gt;0. For optimized LWSCC mix; the dynamic yield stresses varied by 20% owing to hydration acceleration and surface charge of metakaolin with an increase in plastic viscosity by 25% under low shear rate. It was found that the extent of flocculation and particle mitigation governs particle interactions in binders at low shear rates. Moreover, the significant reduction in fresh density by 35% (as compared to control mix) and the measurement of thermal conductivity through transient-state method explain the anisotropic structure effect of silicate layers in the heterogeneous LC³ system. A Microstructure study was employed to understand the contribution of secondary calcium silicate hydrate (C-S-H), chemical interaction of metakaolin, and interfacial transition zone (ITZ) through scanning electron microscopy (SEM). Finally, embodied energy assessment and cost analysis showed reduction in carbon dioxide (CO₂) emission and cost by nearly 16% and 13%, respectively, leading to a step toward global net zero emission with sustainability.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"21 ","pages":"Article 100601"},"PeriodicalIF":6.2,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Decision support model for evaluating circular economy strategies in private residential construction","authors":"Hsin-Yi Kung ,&nbsp;Yi-Kai Juan ,&nbsp;Daniel Castro-Lacouture","doi":"10.1016/j.dibe.2025.100602","DOIUrl":"10.1016/j.dibe.2025.100602","url":null,"abstract":"<div><div>The circular economy (CE) presents a promising approach to mitigating resource scarcity and environmental impacts. However, implementing CE in the housing market is challenging due to the lack of tools for effectively evaluating and prioritizing CE strategies. This study utilizes a QFD-TOPSIS approach to develop a practical decision support model for a housing project, facilitating the evaluation of CE building strategies by considering technical difficulties, costs, economic benefits, circularity potential, and market demand. Case study results indicate that prioritizing CE strategies with high circularity potential, low cost, and low technical difficulty is crucial for successful implementation. Sensitivity analyses further demonstrate that increased circularity potential facilitates CE implementation. Furthermore, considerable potential exists for future improvements in market demand and technological advancement. Incorporating these principles into architectural design and construction can yield a healthier and more resource-efficient built environment, thereby realizing the value of CE in the construction industry.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"21 ","pages":"Article 100602"},"PeriodicalIF":6.2,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing strength and durability of recycled fine aggregate mixtures using steel fibers, silica fume, and latex polymers","authors":"Ali Mardani ,&nbsp;Hatice Gizem Şahin ,&nbsp;Yahya Kaya ,&nbsp;Naz Mardani ,&nbsp;Joseph J. Assaad ,&nbsp;Hilal El-Hassan","doi":"10.1016/j.dibe.2024.100599","DOIUrl":"10.1016/j.dibe.2024.100599","url":null,"abstract":"<div><div>Recycled fine aggregates (RFA) are often prohibited in new construction applications because of their poor physical properties. This paper assesses the feasibility of incorporating steel fibers, silica fume, and latex polymers to mitigate the drop in mechanical properties and durability of RFA-modified cementitious matrices. Testing was conducted on concrete-equivalent mortars with 80–100 MPa compressive strength and later validated on corresponding concrete mixtures. Results showed that the mechanical strengths, drying shrinkage, abrasion, and freeze/thaw resistance degraded when the natural sand was replaced by 100% RFA. The use of steel fibers or silica fume was efficient in restoring these properties within ±8% of the control mix. Meanwhile, latex polymers were more efficient in enhancing the permeability and bond properties with steel reinforcement within ±5% of the control mix. The optimum percentage of steel fibers determined from the TOPSIS method was 0.5% by volume, while the silica fume and latex optimum percentages were 6% and 2.5% of binder mass, respectively.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"21 ","pages":"Article 100599"},"PeriodicalIF":6.2,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A data-driven approach for spectrum-matched earthquake ground motions with physics-informed neural networks","authors":"Ju-Hyung Kim ,&nbsp;Young Hak Lee ,&nbsp;Jang-Woon Baek ,&nbsp;Dae-Jin Kim","doi":"10.1016/j.dibe.2024.100598","DOIUrl":"10.1016/j.dibe.2024.100598","url":null,"abstract":"<div><div>This study presents a novel data-driven approach for generating spectrum-matched earthquake ground motions using physics-informed neural networks (PINNs). The methodology leverages real recorded earthquake data and employs singular value decomposition for dimensionality reduction, enabling the extraction of eigen motions that capture correlated temporal patterns. By combining PINNs with these eigen motions, spectrum matching is achieved with clear physical interpretability. The generated motions balance conventional linear scaling and spectrum matching, with the degree of matching dependent on the input motions, while retaining the realistic non-stationary features inherent in the input data. The adequacy of the post-matched motions is evaluated through various measures and incremental dynamic analysis to identify any potential biases introduced by the spectral matching process. The findings indicate that, despite some deviations in spectral shape, the overall performance of the spectrum-matched motions remains acceptable, without introducing significant bias.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"21 ","pages":"Article 100598"},"PeriodicalIF":6.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Damage evolution and avalanche characteristics of concrete under salt-freezing action by acoustic emission","authors":"Yunfeng Zhao ,&nbsp;Minghui Chen ,&nbsp;Xiang Jiang ,&nbsp;Xuepeng Cao ,&nbsp;Binbin Qin","doi":"10.1016/j.dibe.2024.100600","DOIUrl":"10.1016/j.dibe.2024.100600","url":null,"abstract":"<div><div>Concrete structures in saline-alkali areas will suffer from salt freezing and cause diseases. In this paper, experiments of concrete deterioration under the coupling action of sulfate attack and freeze-thaw cycles were carried out. The avalanche characteristics of acoustic emission (AE) signals generated during concrete failure were analyzed statistically by avalanche dynamics theory, and compared with traditional AE analysis methods. The results show that with the increase of cycle times, the proportion of shear cracks in the failure process of concrete specimens gradually increases, and the AE <em>b</em>-value increases. the energy distribution exponent, amplitude distribution exponent, and duration distribution exponent of concrete specimens gradually increase, while the correlation exponent between amplitude and absolute energy decreases, and the correlation exponent between duration and amplitude fluctuates within a certain range. The distribution exponent of waiting time shows robustness. Avalanche exponents can be applied to the quantitative characterization of concrete damage under the salt-freezing action.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"21 ","pages":"Article 100600"},"PeriodicalIF":6.2,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Capillary water absorption into alkali-activated slag materials: Experimental and numerical investigation","authors":"Fangzhou Ren,&nbsp;Jian Zhang,&nbsp;Jianxiang Yang,&nbsp;Xiangsheng Chen","doi":"10.1016/j.dibe.2024.100597","DOIUrl":"10.1016/j.dibe.2024.100597","url":null,"abstract":"<div><div>This study conducted both experimental and numerical investigations on the capillary water absorption into AAS materials with varying mix proportions. The results demonstrate that the capillary water absorption of AAS mortars adheres to the square root of time (SRT) law until wetting front reaches the top surface of specimen. The isopropanol (IPA) absorption of AAS mortars also follows the SRT law, and the measured intrinsic capillary sorptivity <span><math><msub><mrow><mi>S</mi></mrow><mrow><mtext>int</mtext></mrow></msub></math></span> for IPA and water are quite close. Through theoretical modeling and numerical simulation, the capillary absorption kinetics of different AAS mortars can all be accurately quantified using the Richards equation, regardless of the water retention curve model employed. These results suggest that the microstructure of AAS materials studied herein is stable during capillary water absorption. This may be attributed to the viscous characteristics of AAS materials, arising from the irreversible collapse and rearrangement of the nanostructure of C-A-S-H gels during drying.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"21 ","pages":"Article 100597"},"PeriodicalIF":6.2,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluating the dual role of sea water and metakaolin in the performance, efflorescence mitigation, and phase composition of sodium silicate-activated marble powder","authors":"Amira A. Shereiqi ,&nbsp;Khalifa Al-Jabri ,&nbsp;Mohammed S. Meddah ,&nbsp;Kazi Md Abu Sohel ,&nbsp;Alaa A. Saleh ,&nbsp;Hamdy A. Abdel-Gawwad","doi":"10.1016/j.dibe.2024.100596","DOIUrl":"10.1016/j.dibe.2024.100596","url":null,"abstract":"<div><div>Marble waste (MW) poses a significant environmental challenge due to its large quantities and difficulty in disposal. This study explored the full utilization of MW powder in creating binder. Combining MW with sodium silicate (Na₂SiO₃) results in the formation of calcium silicate hydrate (C-S-H) and pirssonite. The resulting binder demonstrated a compressive strength of 15–25 MPa after 28 days of air curing. Using metakaolin provides the system with dissolved aluminosilicate, which mitigates efflorescence through a neutralization process and enhances the compressive strength of the resulting hardened binder. Seawater also proved effective in reducing efflorescence by decreasing the solubility of pirssonite. Moreover, mixing seawater with Na₂SiO₃ induced the formation of nanoprecipitates, which positively affects the mechanical performance of the resultant binder. For sustainable building practices, using seawater as a mixing water for unreinforced building products is recommended. This conserves freshwater, making it available for other critical applications.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"21 ","pages":"Article 100596"},"PeriodicalIF":6.2,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing sustainable utilization of iron-based alkaline solid wastes for carbon mineralization: Insights into CO2 transport and adsorption dynamics","authors":"Gen Li ,&nbsp;Jie Yang ,&nbsp;Hao Li ,&nbsp;Jiaxiang Liew ,&nbsp;Jiasheng Huang","doi":"10.1016/j.dibe.2024.100595","DOIUrl":"10.1016/j.dibe.2024.100595","url":null,"abstract":"<div><div>Iron-based alkaline solid wastes provide substrates for carbon mineralization, addressing global warming. However, the mechanisms of CO₂ transport and adsorption within their porous structures are not fully understood. Using advanced grand canonical Monte Carlo (GCMC) methods, this study explores CO₂ transport and adsorption in iron-based alkaline wastes under different humidity conditions. The results show that FeO and Fe₂O₃ reduce the CO₂ adsorption capacity in calcium hydroxide (CH) nanopores, a key component of these wastes. The presence of iron-based solids causes inhomogeneous porewater distribution, diminishing CO₂ dissolution and adsorption on the gas-liquid interface. By analyzing adsorption energy and CO₂ diffusion coefficients, we found that iron-based porous systems have lower CO₂ transport efficiency and storage capacity, highlighting their limited carbonation potential. The weak CO₂-surface interactions in these wastes are identified as the primary challenge to improving carbon mineralization. These findings provide crucial insights for enhancing the sustainable use of iron-based alkaline wastes.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"21 ","pages":"Article 100595"},"PeriodicalIF":6.2,"publicationDate":"2024-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of microencapsulated phase change materials (PCMs) on the thermal and mechanical performance of cement mortar","authors":"Iman Asadi ,&nbsp;Guomin Ji ,&nbsp;Gerald Steiner ,&nbsp;Mohammad hajmohammadian baghban","doi":"10.1016/j.dibe.2024.100594","DOIUrl":"10.1016/j.dibe.2024.100594","url":null,"abstract":"<div><div>This study investigates the integration of Microencapsulated Phase Change Materials (MPCM) into cement mortar to enhance its thermal performance while assessing its mechanical and physical properties. MPCMs, known for their high thermal energy storage capacity, help stabilize indoor temperatures by absorbing and releasing heat during phase transitions. Cement mortars with varying cement-to-sand ratios and volumetric fractions (VF) of MPCM were tested for workability, density, compressive strength, water absorption, and thermal conductivity. Microstructural analysis using X-ray CT imaging was also conducted. Results show that incorporating MPCMs reduces workability (with a maximum water-to-cement ratio increase to 0.68), density (up to 18.3%), and compressive strength (up to 46.3%), highlighting the trade-offs between thermal performance and structural integrity.</div></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"21 ","pages":"Article 100594"},"PeriodicalIF":6.2,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}