Construction and Building Materials最新文献_第2页

High-strain rate compressive and tensile behavior of bamboo-based foamed concrete 竹基泡沫混凝土的高应变率压缩和拉伸性能

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-12-19 DOI: 10.1016/j.conbuildmat.2025.144772

Fengyang Ye , Xuguang Wang , Youhuan Xu , Beibei Xiong , Dade Lai , Yan Xiao , Cristoforo Demartino

This study investigates the mechanical behavior of a novel bamboo-based foamed concrete under both quasi-static and high strain-rate loading conditions, aiming to develop a sustainable alternative for lightweight, impact-resistant construction. Bamboo aggregates of varying sizes (coarse, medium, and fine) were used to partially replace natural sand at substitution ratios of 1.25%, 2.5%, and 5%. The dry densities range from around 1000 kg/m

^{3}

for the control mix up to around 1300 kg/m

^{3}

. A comprehensive experimental program was conducted, including microstructural analysis, quasi-static compressive and split tensile tests, and dynamic tests using a Split Hopkinson Pressure Bar (SHPB) apparatus. Results demonstrated that incorporating bamboo aggregates significantly enhanced the mechanical properties of the foamed concrete, with the most pronounced improvements observed when using fine aggregates at higher substitution ratios. The F-5 mix (fine aggregates at 5% substitution) achieved a 38% higher compressive strength (11.4 MPa) and a 42% higher split tensile strength (1.7 MPa) compared with the control mix. Under dynamic loading, bamboo-reinforced specimens exhibited up to a 55% increase in dynamic compressive strength, improved strain-rate sensitivity, and enhanced energy absorption, accompanied by more ductile and cohesive fracture patterns instead of brittle failure. Probabilistic models developed for the Dynamic Increase Factors (DIF) in compression and tension successfully validated the influence of strain rate and aggregate content on performance. These findings establish bamboo-based foamed concrete as a viable, environmentally responsible material with excellent potential for applications requiring lightweight and blast- or impact-resilient properties.

本研究研究了一种新型竹基泡沫混凝土在准静态和高应变率加载条件下的力学行为，旨在开发一种可持续的轻质、抗冲击建筑替代方案。不同粒径（粗、中、细）的竹骨料分别以1.25%、2.5%和5%的替代率部分替代天然砂。干密度范围从约1000公斤/立方米的控制混合物到约1300公斤/立方米。采用霍普金森压杆（split Hopkinson Pressure Bar， SHPB）装置进行了显微组织分析、准静态压缩和劈裂拉伸试验以及动态试验。结果表明，掺入竹骨料显著提高了泡沫混凝土的力学性能，当使用高替代比的细骨料时，观察到最显著的改善。与对照混合料相比，F-5混合料（替代率为5%的细骨料）的抗压强度（11.4 MPa）提高了38%，劈裂抗拉强度（1.7 MPa）提高了42%。在动荷载作用下，竹材增强试件的动抗压强度提高了55%，应变率敏感性提高，能量吸收增强，并伴有更多的延性和黏性断裂模式，而不是脆性破坏。建立了压缩和拉伸动态增加因子（DIF）的概率模型，成功验证了应变率和骨料含量对性能的影响。这些发现表明，竹基泡沫混凝土是一种可行的、环保的材料，在需要轻质和抗爆炸或抗冲击性能的应用中具有良好的潜力。

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引用次数: 0

The efficacy of formaldehyde-free tannin resin in comparison with melamine-formaldehyde resin for enhancing the biological durability of ancient wooden copings 无甲醛单宁树脂与三聚氰胺甲醛树脂增强古木覆膜生物耐久性的效果比较

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-12-18 DOI: 10.1016/j.conbuildmat.2025.144936

Khadijeh Delavaryan AbbasAbadi , Asghar Tarmian , Faramarz Rostami Charati , Reza Oladi , Gholamreza Rahmani , Philippe Gérardin , Antonio Pizzi , Marie-France Thévenon , Peyman Ahmadi

This study aimed to assess the efficacy of formaldehyde-free tannin-hexamine-boric acid resin, in comparison with melamine-formaldehyde resin, for enhancing the biological resistance of ancient oak wood (Quercus castaneifolia) copings against white rot fungus (Trametes versicolor), brown rot fungus (Coniophora puteana), and the underground termite (Reticulitermes flavipes). The wood specimens were impregnated with the resins through a full cell process, followed by drying according to a moisture-based schedule, curing of the resin at 103 ± 2 °C for 48 h, and eventually a 4-hour curing period at 120 °C. The weight percent gain (WPG) was notably higher for the samples impregnated with melamine-formaldehyde resin (15.5 %) compared to those impregnated by formaldehyde-free tannin-hexamine-boric acid resin (7.4 %). No significant discrepancies were observed in leaching resistance among the two resin types. The results revealed that the resins were more effective in enhancing the resistance of ancient wood to termites than to fungi.

本研究旨在比较无甲醛单宁-六亚氰硼酸树脂与三聚氰胺甲醛树脂对古栎木（Quercus castaneifolia）覆膜对白腐菌（Trametes versicolor）、褐腐菌（Coniophora puteana）和地下白蚁（Reticulitermes flavipes）生物抗性的增强效果。用树脂浸渍木材试样，通过全孔浸渍过程，然后按照湿法干燥，树脂在103 ± 2°C下固化48 h，最终在120°C下固化4小时。三聚氰胺-甲醛树脂浸渍样品的增重率（WPG）明显高于无甲醛单宁-六聚氰胺-硼酸树脂浸渍样品的增重率（WPG）（15.5 %）。两种树脂的抗浸出性无显著差异。结果表明，树脂增强古木对白蚁的抵抗力比增强真菌的抵抗力更有效。

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引用次数: 0

Surface chemistry controlled carbonation of amorphous calcium (alumino) silicate slags in aqueous solutions 表面化学控制无定形钙（铝）硅酸盐渣在水溶液中的碳酸化

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-12-18 DOI: 10.1016/j.conbuildmat.2025.144930

Fuzhu Xie , Ruben Snellings , Chen Li , Qiang Ren , Hongen Zhang , Yi Zhang , Zhengwu Jiang

Amorphous calcium (alumino)silicates in industrial solid wastes are key determinants of their reactivity towards CO₂. However, the carbonation mechanisms governing the reaction kinetics of these phases remain insufficiently understood. This study systematically investigates the aqueous carbonation reaction and its enhancement for phosphorus slag (PS) and blast furnace slag (SG). Comparative analysis of aqueous carbonation in pure H₂O-CO₂ and NaHCO₃ systems revealed significant differences in the dissolution-carbonation kinetics of PS and SG. Notably, in the NaHCO₃ system, the CO₂ uptake of PS increased by more than an order of magnitude within 30 min, whereas SG exhibited only a marginal increase (∼2 ×) even after 6 h of carbonation. Surface chemistry analysis indicated that these disparities coincide with the formation of a surface alumina-silica gel layer on SG during carbonation. The enhancing effect of NaHCO₃ is attributed to the increased (bi-)carbonate concentration at higher pH. Enhanced carbonation in the NaHCO₃ system was confined to the early stages, before rapid formation of surface precipitates slowed the carbonation progress.

工业固体废物中的无定形钙（铝）硅酸盐是其对CO2反应性的关键决定因素。然而，控制这些相反应动力学的碳酸化机制仍然没有得到充分的了解。本文系统地研究了磷渣和高炉渣的水碳酸化反应及其强化作用。对纯H₂O-CO₂和NaHCO₃体系的水相碳酸化反应进行对比分析，发现PS和SG的溶解-碳酸化动力学存在显著差异。值得注意的是，在NaHCO₃体系中，PS的CO2吸收量在30 min内增加了一个数量级以上，而SG即使在碳酸化6 h后也只表现出边际增加（~ 2 ×）。表面化学分析表明，这些差异与碳化过程中SG表面氧化铝-硅胶层的形成一致。NaHCO₃的增强作用是由于在较高的ph下（双）碳酸盐浓度的增加。NaHCO₃体系中增强的碳酸化作用局限于早期阶段，在表面沉淀的快速形成减缓了碳酸化过程之前。

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引用次数: 0

Enhancing mechanical and durability properties of recycled concrete aggregates (RCA) through large-scale CO2 carbonation treatment 通过大规模二氧化碳碳化处理提高再生混凝土骨料（RCA）的机械性能和耐久性

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-12-18 DOI: 10.1016/j.conbuildmat.2025.144855

Hossein Sousanabadi Farahani , Amin Hosseini Zadeh , Miras Mamirov , Jiong Hu , Chris Hawkins , Seunghee Kim

This study investigates the mechanical and durability performance of recycled concrete aggregates (RCA) after large-scale carbonation treatment using carbon dioxide (CO₂). RCA obtained from a local producer in Nebraska, USA, was subjected to controlled carbonation in a 1-ton capacity carbonation chamber under varying conditions of initial CO₂ pressure, treatment duration, aggregate volume, and relative humidity. Mechanical and physical properties were evaluated through specific gravity, water absorption, aggregate crushing value (ACV), Los Angeles (LA) abrasion, and freeze-thaw (F-T) resistance tests. Results show that carbonation did not significantly alter bulk properties such as specific gravity and water absorption but substantially improved mechanical and durability performance. Carbonation reduced ACV by up to 20 %, LA abrasion mass loss by ∼17 %, and F-T mass loss by comparable margins, confirming enhanced resistance to crushing, wear, and freeze-thaw cycles. The improvements were most strongly correlated with CO₂ consumption per RCA mass and treatment duration, while optimal efficiency was observed at 50–60 % of relative humidity. Statistical analysis further identified CO₂ consumption per RCA mass and treatment duration as the most influential parameters across all tests. These findings highlight the dual benefit of carbonation in strengthening RCA while sequestering CO₂ and suggest practical guidelines for optimizing treatment conditions to achieve both mechanical and durability enhancement and environmental sustainability.

本研究考察了大规模二氧化碳碳化处理后再生混凝土骨料（RCA）的力学性能和耐久性。来自美国内布拉斯加州当地生产商的RCA在一个容量为1吨的碳酸化室中，在不同的初始二氧化碳压力、处理时间、骨料体积和相对湿度条件下进行可控碳酸化。通过比重、吸水率、骨料破碎值（ACV）、洛杉矶（LA）磨损和冻融（F-T）阻力测试来评估机械和物理性能。结果表明，碳化没有显著改变材料的体积性能，如比重和吸水率，但大大提高了材料的机械性能和耐久性。碳化使ACV降低了20% %，LA磨损质量损失降低了17% %，F-T质量损失也减少了相当的幅度，证实了抗破碎、磨损和冻融循环的能力增强。改善与每RCA质量的CO2消耗和处理时间密切相关，而在相对湿度为50 - 60% %时观察到最佳效率。统计分析进一步确定，每个RCA质量的二氧化碳消耗量和处理时间是所有测试中影响最大的参数。这些发现强调了碳化在加强RCA和封存CO2方面的双重好处，并为优化处理条件提供了实用指南，以实现机械和耐用性的增强以及环境的可持续性。

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引用次数: 0

Mitigating the impact of incompatibility between PCE superplasticizer and recycled C&D waste powder on fresh properties by optimizing cementitious compositions 通过优化胶凝剂组成，减轻PCE高效减水剂与再生C&D废粉不相容对保鲜性能的影响

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-12-18 DOI: 10.1016/j.conbuildmat.2025.144903

Tao Liang , Shengnan Sha , Dengwu Jiao , S. Thomas Ng

Recycled construction and demolition (C&D) waste powder had been used as a supplementary cementitious material for low-carbon cement-based systems, while its irregular surface morphology and high water absorption caused poor compatibility with polycarboxylate ether (PCE) superplasticizers. To mitigate the impact of this, fly ash was introduced via a simplex centroid design to optimize the cementitious composition and mitigate adverse interactions. The mechanisms were clarified through particle packing, water film thickness, zeta potential, PCE adsorption, and ionic concentration. Results showed that recycled powder improved initial flowability due to better particle packing, lower surface area, and higher negative charge, but significantly compromised flowability retention due to increased PCE adsorption and water absorption. Partially substituting recycled powder with fly ash remarkedly improved flowability retention and setting behaviors compared to using recycled powder alone, but close to that of pure cement paste. This enhancement was attributed to the dilution of recycled powder, the ball bearing effect of fly ash, and more PCE molecules remained in the interstitial solution. Finally, synergistically incorporating 20 % recycled powder and 20 % fly ash could achieve the optimal performance. This study provides a theoretical and practical guidance for recycled powder applications in cement-based materials under diverse conditions.

回收建筑拆除（C&；D）废粉曾被用作低碳水泥基体系的补充胶凝材料，但由于其表面形貌不规则，吸水率高，导致与聚羧酸醚（PCE）高效减水剂的相容性较差。为了减轻这种影响，通过单形质心设计引入了粉煤灰，以优化胶凝成分并减轻不利的相互作用。通过颗粒填充、水膜厚度、zeta电位、PCE吸附和离子浓度等指标对其机理进行了研究。结果表明，再生粉末由于颗粒填料更好、比表面积更小、负电荷更高而提高了初始流动性，但由于PCE吸附和吸水率增加而显著降低了流动性保持性。粉煤灰部分替代再生粉与单独使用再生粉相比，可明显改善水泥浆体的流动性保持和凝结性能，但与纯水泥浆体接近。这种增强是由于再循环粉末的稀释、粉煤灰的滚珠轴承效应以及更多的PCE分子留在间隙溶液中。结果表明，掺加20% %再生粉和20% %粉煤灰可获得最佳性能。本研究为再生粉体在不同条件下在水泥基材料中的应用提供了理论和实践指导。

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引用次数: 0

Efficient combination of steel-FRP composite bar and seawater sea-sand ECC permanent formwork for high-performance slabs: Experimental and analytical investigation 高性能楼板钢- frp复合筋与海水海砂ECC永久模板的高效组合：试验与分析研究

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-12-18 DOI: 10.1016/j.conbuildmat.2025.144951

Shiwen Han , Yuqi Liu , Kefan Weng , Gang Xiao , Zhenming Li , Jing Yu , Jinping Ou

Steel-FRP composite bar (SFCB) is promising for marine infrastructure by combining high stiffness, strength, and ductility with superior durability. However, the construction of marine infrastructure is still hindered by the brittleness of concrete, the lack of freshwater and river sand, and harsh construction conditions. This study proposes a novel solution by integrating SFCB with seawater sea-sand engineered cementitious composite (ECC) permanent formwork and seawater sea-sand concrete. Experimental and analytical investigation was conducted on composite slabs, examining the effects of reinforcement type and ratio, ECC thickness, interface treatment, and fiber content. Results indicate that bottom ECC acted as permanent formwork, suppressed crack propagation, and prevented shear failure. While SFCB maintained high stiffness and strength, slabs with high reinforcement ratios were prone to shear failure, which was mitigated by ECC layer. Longitudinal grooves outperformed transverse ones at ECC-concrete interface, while low fiber content in ECC caused ineffective shear crack restraint and interfacial failure. Further adding ECC at the top of slabs improved deformability, increasing bearing capacity and ductility by up to 87.7 % and 107.9 %, respectively. Cross-sectional analysis identified three failure modes, and calculation methods for reinforcement limits and flexural capacity were proposed. These results support the safe design of high-performance composite slabs.

钢- frp复合钢筋（SFCB）结合了高刚度、高强度、高延性和优异的耐久性，在海洋基础设施中具有广阔的应用前景。然而，海洋基础设施的建设仍然受到混凝土脆性、淡水和河砂缺乏、施工条件恶劣等问题的阻碍。本研究提出了一种将SFCB与海水海砂工程胶凝复合材料（ECC）永久模板和海水海砂混凝土相结合的新解决方案。对叠合板进行了试验和分析研究，考察了配筋类型和配筋比、ECC厚度、界面处理和纤维含量对叠合板的影响。结果表明，底部ECC作为永久模板，抑制裂纹扩展，防止剪切破坏。在SFCB保持较高的刚度和强度的同时，高配筋率的板容易发生剪切破坏，ECC层可以缓解这种破坏。在ECC-混凝土界面上，纵向沟槽优于横向沟槽，而低纤维含量的ECC对剪切裂缝的抑制效果较差，导致界面破坏。进一步在楼板顶部添加ECC改善了变形能力，承载力和延性分别提高了87.7 %和107.9 %。通过截面分析确定了三种破坏模式，并提出了配筋极限和抗弯承载力的计算方法。这些结果为高性能复合板的安全设计提供了依据。

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引用次数: 0

Multi-technology investigation on damage mechanisms in hybrid reinforced concrete beams: Synergistic effects of reinforcement and fiber content 混合钢筋混凝土梁损伤机理的多技术研究：配筋和纤维含量的协同效应

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-12-18 DOI: 10.1016/j.conbuildmat.2025.144820

Chuanlin Wang, Shupeng Zhou, Zihan Jiang, Zhiwen Zhu

This study used an integrated AE–DIC–UBCM approach to examine how the reinforcement ratio and steel-fiber content affect the bending performance, cracking behavior, and failure mechanisms of hybrid steel fiber steel bar reinforced concrete (HRC) beams. Ten four‑point bending tests were conducted (ρ = 0.28 %, 0.50 %; Vf = 0 %, 0.1 %, 0.2 %, 0.4 %, 0.8 %). Acoustic emission (AE) was used to characterize damage evolution and identify failure precursors. Digital image correlation (DIC) quantified crack growth and strain fields. The Updated Bridged Crack Model (UBCM) simulated bending response. Increasing reinforcement ratio significantly increased ultimate load; fiber content had limited effect on peak load but improved crack control, reduced crack widths, and shifted failure from brittle to progressive. DIC revealed that fiber-induced strain redistribution and promoted the formation of multidirectional microcracks. RA–AF analysis indicated an earlier transition from tension-dominated to shear-dominated behavior at higher fiber contents; the MCF‑b method effectively identified critical regions where the b‑value preserved key features. UBCM predicted the ultimate loads within 30 % but underestimated mid‑span deflection and stiffness degradation. The combined approach provides a comprehensive framework for assessing HRC damage behavior.

本研究采用AE-DIC-UBCM综合方法研究了配筋率和钢纤维含量对钢纤维-钢筋-混凝土混合梁的弯曲性能、开裂行为和破坏机制的影响。十4 -点弯曲进行了测试(ρ= 0.28 % 0.50 %;Vf % = 0,0.1 % 0.2 % 0.4 % 0.8 %)。利用声发射（AE）表征损伤演化过程，识别破坏前兆。数字图像相关（DIC）量化了裂纹扩展和应变场。更新的桥梁裂纹模型（UBCM）模拟了弯曲响应。增加配筋率显著提高极限荷载；纤维含量对峰值荷载的影响有限，但改善了裂缝控制，减小了裂缝宽度，使破坏从脆性破坏转向渐进破坏。DIC结果表明，纤维诱导的应变重分布促进了多向微裂纹的形成。RA-AF分析表明，纤维含量越高，从拉伸为主向剪切为主转变的时间越早；MCF - b方法有效地识别出b值保留关键特征的关键区域。UBCM预测极限荷载在30% %以内，但低估了跨中挠度和刚度退化。综合方法为评估HRC损伤行为提供了一个全面的框架。

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引用次数: 0

Sustainable, high-weather resistance, and low-temperature heat-treated outdoor bamboo fiber composite materials: Processing and chemical characterization 可持续，高耐候性，低温热处理室外竹纤维复合材料：加工和化学特性

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-12-18 DOI: 10.1016/j.conbuildmat.2025.144918

Chengjian Huang , Rencong Guo , Yongjie Bao , Hui Li , Minzhen Bao , Fei Rao , Zaixing Wu , Runbo Xue , Xiaoyan Li , Xin An , Neng Li

Outdoor bamboo fiber composite materials (OBFMs) are widely used in structural and building applications due to their sustainability, high strength, and desirable texture. Low-temperature heat treatment of OBFMs enhances the material’s surface properties and weather resistance while preserving its mechanical strength; however, the underlying chemical mechanisms remain unclear. This research endeavors to elucidate the evolution trends of chemical properties in low-temperature heat treated OBFMs subjected to photodegradation environments. X-ray diffractometer analysis, Fourier-transform infrared spectroscopy, scanning electron microscope-energy dispersive spectrometer, X-ray photoelectron spectroscopy, ¹³C nuclear magnetic resonance, and thermogravimetric analysis were employed to characterize crystallinity, functional groups, microstructures, surface elemental distributions, molecular bonding configurations, and thermal degradation profiles, respectively. Experimental results demonstrated that the OBFMs obtained through low-temperature heat treatment underwent a series of reactions, including water dehydration, significant depolymerization, and bond cleavage in hemicellulose and lignin. Multi-characterization revealed this treatment mainly degrades lignin’s non-skeletal groups and modifies hemicellulose’s groups, without damaging cellulose’s crystalline region or lignin’s aromatic skeleton, explaining mechanical strength preservation. Following 320 h of weathering, the lignin in OBFMs experienced a sequence of bond cleavage, crosslinking, photooxidation, and recombination processes. Notably, the oxygen content of OBFM-150 increased moderately, with an increment of 2.63 %. Additionally, the weathered OBFM-150 exhibited the lowest O/C ratio (0.36), the least variation in lignin functional group proportions, and the lowest C3 +C4 content (6.48 %). OBFM-150 effectively enhances the stability of its chemical structure, rendering it suitable for outdoor architectural and decorative applications.

室外竹纤维复合材料（OBFMs）由于其可持续性、高强度和理想的质地而广泛应用于结构和建筑应用。OBFMs的低温热处理提高了材料的表面性能和耐候性，同时保持了其机械强度；然而，潜在的化学机制仍不清楚。本研究旨在阐明低温热处理OBFMs在光降解环境下化学性质的演变趋势。采用x射线衍射分析、傅里叶变换红外光谱、扫描电镜-能量色散光谱仪、x射线光电子能谱、13C核磁共振和热重分析分别表征了其结晶度、官能团、微观结构、表面元素分布、分子键构型和热降解谱。实验结果表明，通过低温热处理得到的OBFMs在半纤维素和木质素中发生了一系列反应，包括水脱水、明显的解聚和键裂解。多重表征表明，该处理主要降解木质素的非骨架基团和修饰半纤维素的基团，而不破坏纤维素的结晶区或木质素的芳香骨架，解释了机械强度的保存。经过320 h的风化后，OBFMs中的木质素经历了一系列的键解理、交联、光氧化和重组过程。值得注意的是，OBFM-150的氧含量适度增加，增幅为2.63 %。此外，风化OBFM-150的O/C比最低（0.36），木质素官能团比例变化最小，C3 +C4含量最低（6.48 %）。OBFM-150有效地增强了其化学结构的稳定性，使其适用于室外建筑和装饰应用。

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引用次数: 0

Examining the passive properties of laser powder bed fused austenitic, stainless steel in hydrochloric acid: Effect of building directions 激光粉末床熔接奥氏体不锈钢在盐酸中的被动性能研究：构建方向的影响

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-12-18 DOI: 10.1016/j.conbuildmat.2025.144943

Qiancheng Zhao , Hong Luo , Chengtao Li , Bingbing Yan , Guangxue Liang

The additive manufacturing method has been considered a promising technology to fabricate materials. Studying the influence of additive manufacturing process parameters on material properties helps optimize material properties. This study investigated the characteristics of passive films on laser powder bed fused 0Cr21Ni6Mn9N austenitic stainless steel in hydrochloric acid, focusing on the influence of building directions. The analysis included microstructure, electrochemical behavior, and chemical composition of the passive films. Results indicated that building directions affected the corrosion resistance of the 0Cr21Ni6Mn9N steels. The samples fabricated at a 0° building direction exhibited superior corrosion resistance compared to those built at 90°, as evidenced by higher polarization resistance and pitting potential. Passive film composition was analyzed by X-ray photoelectron spectroscopy compared to the wrought steels. Oxides and hydroxides of metal elements were the main components of the passive film. A higher Cr/Fe ratio and a higher O^2-/OH^- ratio in the passive film of samples built at 0° contributed to the better corrosion resistance.

增材制造方法被认为是一种很有前途的材料制造技术。研究增材制造工艺参数对材料性能的影响有助于优化材料性能。本文研究了0Cr21Ni6Mn9N奥氏体不锈钢在盐酸中激光粉末床熔敷钝化膜的特性，重点研究了构筑方向对钝化膜的影响。分析了钝化膜的微观结构、电化学行为和化学成分。结果表明，建筑方向对0Cr21Ni6Mn9N钢的耐蚀性有影响。与90°方向制备的样品相比，在0°方向制备的样品具有更好的耐腐蚀性，这证明了更高的极化电阻和点蚀电位。用x射线光电子能谱分析了钝化膜的成分，并与变形钢进行了比较。金属元素的氧化物和氢氧化物是钝化膜的主要成分。当温度为0°时，钝化膜中Cr/Fe比和O2-/OH-比越高，其耐蚀性越好。

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引用次数: 0

Experimental investigation and multi-scale Mori–Tanaka modeling of viscoelastic asphalt mastic with imperfect interfaces 含不完美界面粘弹性沥青胶浆的试验研究及多尺度Mori-Tanaka模型

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-12-18 DOI: 10.1016/j.conbuildmat.2025.144715

K. Lakshmi Roja , G. Chatzigeorgiou , F. Meraghni , Eyad Masad

Asphalt mastics, comprising asphalt binder and mineral filler, play a critical role in determining the performance of asphalt mixtures. This study examines the viscoelastic behavior of mastics composed of two asphalt binders and three fillers (gabbro, quartz, and hydrated lime) with varying particle sizes. Repeated Creep and Recovery Tests (RCRT) were conducted to evaluate the influence of filler type and concentration on mastic strain response. Then, a modified multi-scale Mori–Tanaka model was successfully employed to predict the viscoelastic properties of the mastics. The model parameters were found to be influenced by the filler type and size, as well as by imperfections at the binder–filler interface. Results show that mastics containing hydrated lime exhibit higher moduli, particularly at high filler content (40% by volume), with significantly lower final strain in RCRT compared to those with gabbro or quartz. This enhanced performance is attributed to the high surface area of hydrated lime and its chemical interactions with the asphalt binder, which promote the formation of a network structure within the mastic. While the proposed model effectively captures the physical interactions in asphalt mastics, it requires further refinement to account for the additional influence of chemical reactions between fillers, such as hydrated lime, and the asphalt binder.

沥青胶浆是由沥青粘结剂和矿物填料组成的，对沥青混合料的性能起着至关重要的作用。本研究考察了由两种沥青粘合剂和三种不同粒径的填料（辉长岩、石英和水合石灰）组成的胶浆的粘弹性行为。采用重复蠕变恢复试验（RCRT）评价填料类型和浓度对土体应变响应的影响。然后，采用改进的多尺度Mori-Tanaka模型成功地预测了材料的粘弹性特性。模型参数受填料类型和尺寸以及粘结剂-填料界面缺陷的影响。结果表明，与含辉长岩或石英的砂浆相比，含水合石灰的砂浆具有更高的模量，特别是在填料含量高（体积比为40%）时，其RCRT的最终应变明显低于含辉长岩或石英的砂浆。这种增强的性能归因于水合石灰的高表面积及其与沥青粘合剂的化学相互作用，这促进了胶泥中网络结构的形成。虽然所提出的模型有效地捕获了沥青胶泥中的物理相互作用，但它需要进一步改进，以考虑填料（如水合石灰）和沥青粘合剂之间化学反应的额外影响。

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引用次数: 0