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Time-dependent rheological behavior of cementitious pastes incorporating carbonated steel slag as a supplementary cementitious material under controlled shear mixing 以碳化钢渣为补充胶凝材料的胶凝体在受控剪切搅拌下随时间变化的流变特性
IF 8 1区 工程技术
Construction and Building Materials Pub Date : 2026-04-11 Epub Date: 2026-03-11 DOI: 10.1016/j.conbuildmat.2026.145893
Ning Li, Cise Unluer
{"title":"Time-dependent rheological behavior of cementitious pastes incorporating carbonated steel slag as a supplementary cementitious material under controlled shear mixing","authors":"Ning Li,&nbsp;Cise Unluer","doi":"10.1016/j.conbuildmat.2026.145893","DOIUrl":"10.1016/j.conbuildmat.2026.145893","url":null,"abstract":"<div><div>Cement production contributes around 8% of global anthropogenic CO<sub>2</sub> emissions, underscoring the need for alternative low-carbon binders. Carbonated steel slag addresses this challenge by both sequestering CO<sub>2</sub> and enhancing its reactivity as a supplementary cementitious material (SCM). However, its influence on fresh-state rheology under continuous shear, critical for processing and placement, remains largely unexplored. This study investigated the time-dependent rheological behavior of cement pastes incorporating 20 wt% steel slag powder subjected to different carbonation durations (3 h, 1 d, 28 d). Flow curves, thixotropy, yield stress, viscosity, and rheological index (<em>c</em>/<em>μ</em>) were evaluated and linked to hydration heat release. Results show that fresh-state rheology was governed by reversible flocculation at early ages, giving rise to high thixotropy and strong shear-thinning, and by irreversible hydration-induced structuration at later times, increasing yield stress while reducing thixotropy. Carbonation altered slag mineralogy by consuming reactive Ca-bearing phases and forming stable carbonates, particularly fibrous aragonite, which increased interparticle friction and altered hydration kinetics. Short-term carbonation enhanced reactivity and sustained higher thixotropy, whereas prolonged carbonation reduced hydration peaks and weakened shear-thinning. Appropriate carbonation durations can therefore tailor workability, shear sensitivity, and processing robustness for ready-mix transport, pumping, extrusion, and cast-in-place applications.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"519 ","pages":"Article 145893"},"PeriodicalIF":8.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388214","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}
引用次数: 0
Magnetic field–assisted pre-carbonation of waste concrete fines: Crystal regulation mechanism and performance enhancement in cementitious materials 废混凝土微细粒的磁场辅助预碳化:胶凝材料的晶体调节机制和性能增强
IF 8 1区 工程技术
Construction and Building Materials Pub Date : 2026-04-11 Epub Date: 2026-03-09 DOI: 10.1016/j.conbuildmat.2026.145883
Peiyuan Chen , Qingru Xu , Jiajia Li , Yi Fang , Zhiyuan Yang , Jin Li , Jingshu Shao , Peng Qian , Jialai Wang
{"title":"Magnetic field–assisted pre-carbonation of waste concrete fines: Crystal regulation mechanism and performance enhancement in cementitious materials","authors":"Peiyuan Chen ,&nbsp;Qingru Xu ,&nbsp;Jiajia Li ,&nbsp;Yi Fang ,&nbsp;Zhiyuan Yang ,&nbsp;Jin Li ,&nbsp;Jingshu Shao ,&nbsp;Peng Qian ,&nbsp;Jialai Wang","doi":"10.1016/j.conbuildmat.2026.145883","DOIUrl":"10.1016/j.conbuildmat.2026.145883","url":null,"abstract":"<div><div>The effective reutilization of waste concrete fines (WCF) is crucial for sustainable and green construction; nevertheless, its inherently low reactivity and inadequate performance in cement-based systems hinder its broader utilization. This study proposes a magnetic field–assisted pre-carbonation technique (100–500mT) aimed at enhancing the reactivity and microstructural characteristics of WCF with a particle size below 75 μm. During pre-carbonation, the magnetic field modulates ion migration, nucleation kinetics, and the electrical double layer at the solid–liquid interface, thereby influencing the crystallization behavior of CaCO<sub>3</sub>. Experimental results indicate that magnetic field treatment significantly influences the microstructural development and phase composition of pre-carbonation products obtained from WCF. Specifically, magnetic field application led to a significant reduction of average particle size in the pre-carbonation products, accompanied by a notable increase in the content of submicron CaCO<sub>3</sub> particles. Simultaneously, the magnetic fields inhibited the CaCO<sub>3</sub> crystalline transformation and facilitated the generation of a metastable aragonite phase. Specimens subjected to magnetic field pre-carbonization showed a significant reduction in porosity compared to the control group without magnetic field treatment, accompanied by an increase in compressive strength of approximately 3.61%–17.98% at 28d. Furthermore, the presence of polymorphic CaCO<sub>3</sub> contributes to enhanced microstructural densification. When exposed to a 500 mT magnetic field, the mean elastic modulus of pre-carbonated mortars increased by approximately 10.73% relative to the control group. This study provides theoretical support and a technical pathway for the high-value utilization of construction waste and the development of low-carbon cementitious materials.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"519 ","pages":"Article 145883"},"PeriodicalIF":8.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388230","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}
引用次数: 0
Exploration of in-situ flexible-embedded rebars integrated 3D printed linings (IFR-3DPL) 原位柔性预埋钢筋集成3D打印衬里(IFR-3DPL)的探索
IF 8 1区 工程技术
Construction and Building Materials Pub Date : 2026-04-11 Epub Date: 2026-03-11 DOI: 10.1016/j.conbuildmat.2026.145917
Junxiang Huang , Junchun Yang , Qi Liu , Jiale Wu , Guofang Gong , Huayong Yang , Kai Ren , Dong Han
{"title":"Exploration of in-situ flexible-embedded rebars integrated 3D printed linings (IFR-3DPL)","authors":"Junxiang Huang ,&nbsp;Junchun Yang ,&nbsp;Qi Liu ,&nbsp;Jiale Wu ,&nbsp;Guofang Gong ,&nbsp;Huayong Yang ,&nbsp;Kai Ren ,&nbsp;Dong Han","doi":"10.1016/j.conbuildmat.2026.145917","DOIUrl":"10.1016/j.conbuildmat.2026.145917","url":null,"abstract":"<div><div>Extrusion-based 3D concrete printing (3DCP), extensively applied in constructing complex concrete structures for simplifying production process and enhancing construction efficiency, has yet to be analyzed for its feasibility in the in-situ fabrication of the tunnel linings. This study thus aims to propose an in-situ flexible-embedded rebars integrated 3D printed linings (IFR-3DPL) method, achieving process synergy between the rebar placement and the 3D printed linings. Relations between critical process parameters and the mechanical properties of IFR-3DPL were investigated, including rebar diameter, coating existence, rebar anchorage length, and the printing path of the linings. The results reveal that IFR-3DPL printed with cross-path, featuring coated rebars of 6 mm diameter and 30 mm anchorage length, exhibits a maximum improvement in bond strength of over 95%. Simultaneously, IFR-3DPL printed along the rebar placement direction, featuring coated rebars of the same diameter but 100 mm anchorage length, exhibits the optimal flexural strength. These enhancements in mechanical properties demonstrate the huge potential of applying 3DCP in the future infrastructure industry.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"519 ","pages":"Article 145917"},"PeriodicalIF":8.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388292","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}
引用次数: 0
Integrating durability in concrete mix design for enhanced structural performance and remaining life estimation 在混凝土配合比设计中整合耐久性,以提高结构性能和剩余寿命估算
IF 8 1区 工程技术
Construction and Building Materials Pub Date : 2026-04-11 Epub Date: 2026-03-10 DOI: 10.1016/j.conbuildmat.2026.145849
Shivani Sharma , Falak Vats , Dhiman Basu
{"title":"Integrating durability in concrete mix design for enhanced structural performance and remaining life estimation","authors":"Shivani Sharma ,&nbsp;Falak Vats ,&nbsp;Dhiman Basu","doi":"10.1016/j.conbuildmat.2026.145849","DOIUrl":"10.1016/j.conbuildmat.2026.145849","url":null,"abstract":"<div><div>The effect of durability on reinforced concrete (RC) is often inferred indirectly, as variation of compressive strength between less durable concrete (LDC) and more durable concrete (MDC) conceals the true influence of durability. To isolate durability as the key parameter, this study presents a framework for capacity-based mix design of MDC, enabling direct comparison with a strength-matched (∼47 MPa) LDC. The framework establishes time-based durability assessments aimed at achieving low chloride diffusivity and high resistivity, ensuring that concrete performs its intended function over its service life. An assumption of uniform corrosion is considered throughout the length of the rebar in this study. A five-storey moment-resisting RC frame is modelled with material properties derived from experiments and codal specifications. Time-dependent degradation is captured through nonlinear static pushover analyses at different ages. The failure criteria are defined based on a significant loss in ductility leading to reduced energy dissipation capacity, with a damage index value reaching 1.0. Results indicate that LDC’s global ductility decreases at a much faster rate in comparison to MDC as age progresses. These results are further supported by a damage index-based analysis. The damage-index-based criterion also offers insights into the optimum content of supplementary cementitious material (SCM). Overall, this study integrates durability and strength in concrete mix design; uses experimental and code/literature-based data to simulate aging effects realistically; conducts a damage index-based analysis; and presents a simplified way to estimate the remaining life of a structure, highlighting the need for more durable and sustainable RC infrastructure.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"519 ","pages":"Article 145849"},"PeriodicalIF":8.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388455","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}
引用次数: 0
Decoupling the multifunctional mechanisms in metakaolin's chloride resistance: A gradient design experimental methodology 偏高岭土抗氯离子多功能机制的解耦:梯度设计实验方法
IF 8 1区 工程技术
Construction and Building Materials Pub Date : 2026-04-11 Epub Date: 2026-03-09 DOI: 10.1016/j.conbuildmat.2026.145859
Dongshuai Hou , Qi Ding , Xiangfei Meng , Bin Li , Shiyu Sui , Xiaosheng Li , Yue Zhang , Feixiang Chen , Mengmeng Li , Wei Liang , XinPeng Wang
{"title":"Decoupling the multifunctional mechanisms in metakaolin's chloride resistance: A gradient design experimental methodology","authors":"Dongshuai Hou ,&nbsp;Qi Ding ,&nbsp;Xiangfei Meng ,&nbsp;Bin Li ,&nbsp;Shiyu Sui ,&nbsp;Xiaosheng Li ,&nbsp;Yue Zhang ,&nbsp;Feixiang Chen ,&nbsp;Mengmeng Li ,&nbsp;Wei Liang ,&nbsp;XinPeng Wang","doi":"10.1016/j.conbuildmat.2026.145859","DOIUrl":"10.1016/j.conbuildmat.2026.145859","url":null,"abstract":"<div><div>Metakaolin (MK) has gained attention for enhancing the chloride resistance of concrete. However, the multifunctional mechanisms—specifically, the coupled effects of chloride binding capacity, physical adsorption, pozzolanic activity, and physical filling—remain insufficiently understood. To address this, we engineered functionally graded MK and decoupled these complex interactions through systematic experiments. By controlling thermal treatment parameters, we tailored the morphological characteristics and amorphous aluminosilicate phase composition of MK. Through single-effect evaluation, we fabricated functionally graded MK precursors with customized gradients in the three key effect. Subsequently, we investigated multi-mechanism interactions via compressive strength testing and free chloride titration. Our findings reveal that MK’s pozzolanic and filling effects exhibit an antagonistic relationship, while its pozzolanic activity and chloride binding capacity demonstrate synergistic enhancement. Moreover, chemical binding is the dominant mechanism for chloride resistance, followed by the pozzolanic effect. This study provides new insights into decoupling the multifunctionality of SCMs.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"519 ","pages":"Article 145859"},"PeriodicalIF":8.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388226","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}
引用次数: 0
Enhancing hydration activity of ternesite in sulphoaluminate cement clinker system through CO2 activation 通过CO2活化提高硫铝酸盐水泥熟料体系中铁镁石的水化活性
IF 8 1区 工程技术
Construction and Building Materials Pub Date : 2026-04-11 Epub Date: 2026-03-10 DOI: 10.1016/j.conbuildmat.2026.145872
Jungang Yuan , Jun Chang , Kai Cui
{"title":"Enhancing hydration activity of ternesite in sulphoaluminate cement clinker system through CO2 activation","authors":"Jungang Yuan ,&nbsp;Jun Chang ,&nbsp;Kai Cui","doi":"10.1016/j.conbuildmat.2026.145872","DOIUrl":"10.1016/j.conbuildmat.2026.145872","url":null,"abstract":"<div><div>As a low-calcium mineral, ternesite exhibits a typical low carbon footprint. This study activates the hydration activity of ternesite through CO<sub>2</sub> activation and develops a novel low-carbon cementitious system composed of sulphoaluminate cement (SAC) clinker and carbonated ternesite. The carbonation behavior of ternesite under semi-dry and aqueous conditions was first explored, and the mechanisms underlying the improved hydration and mechanical properties of composite cementitious system were elucidated. The results indicated that compared to semi-dry carbonation, ternesite achieved a higher degree of carbonation through aqueous method. The carbonation products include low-density carbonates, sulfates, and silica gel, which result in a loose and porous structure of carbonated ternesite. Compared to Raw ternesite (RT), semi-dry carbonated ternesite (DCT) and aqueous carbonated ternesite (ACT) further decreased the hydration rate of SAC in nucleation and crystal growth (NG) stage, but strengthened the hydration during the interphase reaction (I) and diffusion (D) stages, resulting in a more gradual and sustained hydration process. Moreover, DCT and ACT further enhanced the 28-day strength of SAC by 15.9% and 34.2%, respectively. The strength enhancement was mainly attributed to the formation and stabilization of ettringite, the regeneration of C-S-H by pozzolanic reaction and the filling effect of silica gel and CaCO<sub>3</sub> particles, which led to the formation of a denser cement matrix. This study offers novel insights for the advancement of new low-carbon cementitious material, achieving a reduction of approximately 7% in CO<sub>2</sub> emission compared to SAC.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"519 ","pages":"Article 145872"},"PeriodicalIF":8.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388227","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}
引用次数: 0
Drying shrinkage behavior and prediction model of alkali-activated slag-based concrete based on orthogonal tests 基于正交试验的碱活化渣基混凝土干缩特性及预测模型
IF 8 1区 工程技术
Construction and Building Materials Pub Date : 2026-04-11 Epub Date: 2026-03-11 DOI: 10.1016/j.conbuildmat.2026.145878
Chen Wu , Peiwei Gao , Fei Geng , Wanlei Zhang , Xiangfei Cheng , Limin Wang , Biao Li
{"title":"Drying shrinkage behavior and prediction model of alkali-activated slag-based concrete based on orthogonal tests","authors":"Chen Wu ,&nbsp;Peiwei Gao ,&nbsp;Fei Geng ,&nbsp;Wanlei Zhang ,&nbsp;Xiangfei Cheng ,&nbsp;Limin Wang ,&nbsp;Biao Li","doi":"10.1016/j.conbuildmat.2026.145878","DOIUrl":"10.1016/j.conbuildmat.2026.145878","url":null,"abstract":"<div><div>Alkali-activated slag-based concrete (AASC) exhibits pronounced volumetric instability, thereby increasing its susceptibility to cracking. This paper systematically investigates the effects of solution-to-binder ratio (SR), alkali-activator modulus (AM), fly ash (FA) content and calcium oxide-based expansive agent (EA) content on the workability, mechanical properties and drying shrinkage behavior of AASC using an orthogonal experimental design. Range analysis and analysis of variance were employed to determine the optimal mix design for each target performance and to assess the significance of each factor. The mechanisms by which FA and EA affect the hardening and drying shrinkage behavior of AASC are investigated using scanning electron microscopy, X-ray diffraction, mercury intrusion porosimetry and internal relative humidity (IRH) monitoring. The results indicate that increases in SR and AM enhance the workability of AASC. Among the SR levels investigated, the 28-day compressive strength peaks at SR = 0.42, whereas the 90-day drying shrinkage is minimized at SR = 0.44. When AM increases from 1 to 1.4, the 28-day compressive strength improves by 15.18%, whereas the 90-day drying shrinkage decreases by 22.63%. Among the four factors, the FA and EA contents exert more pronounced effects on the mechanical properties and drying shrinkage behavior of AASC. The incorporation of FA and EA shifts the pore-size distribution toward larger pores (i.e., increases macroporosity) and delays IRH reduction, thereby reducing mechanical properties but mitigating drying shrinkage. Compared with pure AASC, the mesopore porosities of mixtures containing 45% FA or 9% EA decrease by 19.8% and 33%, respectively. Correspondingly, their 90-day drying shrinkage is reduced by 30.38% and 49.27%. Finally, an age-dependent drying shrinkage prediction model for AASC is developed based on the experimental results and validated against test data, demonstrating good accuracy and applicability. This study provides a theoretical basis for mix-proportion optimization, drying shrinkage mitigation and engineering applications of AASC.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"519 ","pages":"Article 145878"},"PeriodicalIF":8.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388242","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}
引用次数: 0
Optimized aggregate particle packing approach for improved interfacial bonding in RAP- based concrete mixtures 优化集料颗粒填充方法以改善RAP基混凝土混合料的界面粘合
IF 8 1区 工程技术
Construction and Building Materials Pub Date : 2026-04-11 Epub Date: 2026-03-11 DOI: 10.1016/j.conbuildmat.2026.145905
Ritika Kamboj, Solomon Debbarma
{"title":"Optimized aggregate particle packing approach for improved interfacial bonding in RAP- based concrete mixtures","authors":"Ritika Kamboj,&nbsp;Solomon Debbarma","doi":"10.1016/j.conbuildmat.2026.145905","DOIUrl":"10.1016/j.conbuildmat.2026.145905","url":null,"abstract":"<div><div>This study investigates the influence of aggregate particle packing optimization on the interfacial transition zone (ITZ) characteristics and mechanical performance of cement concrete incorporating reclaimed asphalt pavement (RAP) aggregates. The proportion of natural aggregates (NA) within the concrete mixture was optimized experimentally, while the aggregates within the RAP-concrete mixtures were optimized using a Taguchi-based approach. Three RAP sources (R1, R2, and R3) were used, with coarse aggregate replacement levels of 20% for R1 and 40% for R2 and 40% for R3, and the mixtures were compared with NA concrete after 7- and 28- days of water curing. The optimized RAP mixtures achieved maximum packing densities of 0.773, 0.743, and 0.775 for R1, R2, and R3, respectively. Mechanical test results showed reductions in compressive strength, flexural strength, split tensile strength, and modulus of elasticity for all RAP mixtures. SEM-BSE analysis indicated higher porosity and reduced presence of hydration products within the ITZ of RAP-concrete, while SEM-EDS revealed lower calcium-rich phases compared to NA-concrete. A reduction in ITZ thickness with curing age in RAP-concrete was consistent with delayed but progressive densification. TGA and XRD analyses further suggested delayed hydration and lower bound water content in RAP-concrete compared to NA-concrete. Although particle packing improved the granular structure of RAP mixtures, this improvement did not fully compensate for the reduced mechanical performance observed in RAP-concrete mixtures.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"519 ","pages":"Article 145905"},"PeriodicalIF":8.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388249","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}
引用次数: 0
Pore structure reconstruction in waste ceramic powder pervious concrete: Rheological and pozzolanic mechanisms 废陶瓷粉透水混凝土的孔隙结构重建:流变学和火山灰机制
IF 8 1区 工程技术
Construction and Building Materials Pub Date : 2026-04-11 Epub Date: 2026-03-09 DOI: 10.1016/j.conbuildmat.2026.145861
Hui Song , Kaixin Wan , Rongxiang Nie , Huaxin Zhan , Jinwei Yao , Yonggang Lee
{"title":"Pore structure reconstruction in waste ceramic powder pervious concrete: Rheological and pozzolanic mechanisms","authors":"Hui Song ,&nbsp;Kaixin Wan ,&nbsp;Rongxiang Nie ,&nbsp;Huaxin Zhan ,&nbsp;Jinwei Yao ,&nbsp;Yonggang Lee","doi":"10.1016/j.conbuildmat.2026.145861","DOIUrl":"10.1016/j.conbuildmat.2026.145861","url":null,"abstract":"<div><div>Simultaneously optimizing mechanical performance and carbon footprint remains a central challenge in the design of pervious concrete (PC). Waste Ceramic Powder (WCP) provides a promising low-carbon supplementary cementitious material (SCM); however, the micro-mechanisms governing its non-linear strength evolution—characterized by early-age loss and late-age recovery—remain insufficiently understood due to a lack of dynamic, multi-scale evidence. This study elucidates a dual-stage pore structure reconstruction mechanism in WCP-modified PC using rheological testing, non-destructive Low-Field Nuclear Magnetic Resonance (LF NMR), and micro-morphological characterization (SEM, XRD, TGA). Results reveal a counter-intuitive \"low porosity–low strength\" anomaly at early ages (28 d). This is mechanistically governed by rheology-mediated paste redistribution, where increased yield stress creates \"thick coatings but starved bonding bridges,\" compromising effective load-bearing areas despite reduced porosity. At later ages (56–90 d), active pozzolanic reactions between WCP and portlandite (CH) generate secondary C–S–H gels and drive a distinct “one-increase, three-decrease” transformation (i.e., increasing harmless gel pores while simultaneously reducing all harmful pore categories), markedly densifying the matrix. An optimal WCP replacement level of 20% achieves a 90-day compressive strength 15.34% higher than the control while maintaining excellent permeability (&gt;8 mm/s). This work bridges paste rheology, nanoscale pore evolution, and macroscopic structural response, providing a robust scientific paradigm for the design of high-performance, low-carbon PC.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"519 ","pages":"Article 145861"},"PeriodicalIF":8.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388441","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}
引用次数: 0
Preparation and performance evaluation of microcapsules for asphalt fume reduction and deodorant stability enhancement 微胶囊沥青烟尘降除臭稳定性的制备及性能评价
IF 8 1区 工程技术
Construction and Building Materials Pub Date : 2026-04-11 Epub Date: 2026-03-10 DOI: 10.1016/j.conbuildmat.2026.145908
Canyu Ding , Quantao Liu , Xing Gong , Na Li , Shaopeng Wu
{"title":"Preparation and performance evaluation of microcapsules for asphalt fume reduction and deodorant stability enhancement","authors":"Canyu Ding ,&nbsp;Quantao Liu ,&nbsp;Xing Gong ,&nbsp;Na Li ,&nbsp;Shaopeng Wu","doi":"10.1016/j.conbuildmat.2026.145908","DOIUrl":"10.1016/j.conbuildmat.2026.145908","url":null,"abstract":"<div><div>Although conventional organic deodorants can inhibit the emissions of volatile organic compounds (VOCs) in asphalt, their practical application is limited by high volatility, poor storage stability and difficulty in transporting them over long distances. To address these issues, the deodorant was encapsulated in urea-formaldehyde resin through in-situ polymerization, forming microcapsules that can maintain the stability of the deodorant and release them at the mixing temperature of asphalt. The deodorant-microcapsules were first characterized in terms of their microscopic morphology, particle size, rupture temperature and deodorant-loading capacity. The deodorant-microcapsules were then incorporated into the 70# base asphalt to study their impact on the fundamental properties, storage stability, high, medium and low-temperature rheological behaviors of the modified asphalt. Furthermore, the inhibitory effects of the deodorant-microcapsules on VOCs and H<sub>2</sub>S emissions from asphalt were explored. Results demonstrated that the microcapsules produced in this study were structurally intact, with uniform size distribution and up to 73.8% deodorant-loading capacity. Deodorant-microcapsules strengthened the intermediate/low-temperature properties of asphalt while slightly weakening its high-temperature properties. Furthermore, the microcapsules effectively reduced both concentration and variety of VOCs released from asphalt, with enhanced inhibitory effects as dosage increased. The optimal dosage of microcapsules was 0.13%. Compared to base asphalt, the deodorized asphalt containing 0.13% microcapsules showed 82.86% and 90.00% reductions in number of chain hydrocarbons and aromatic hydrocarbons, respectively, with total VOCs concentration and average H<sub>2</sub>S concentrations decreasing by 61.84% and 70.06%. This research can provide a novel approach for producing deodorant-asphalt.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"519 ","pages":"Article 145908"},"PeriodicalIF":8.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388450","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}
引用次数: 0
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