Construction and Building Materials最新文献_第5页

A range-based method for identifying optimal foaming conditions of mechanically foamed asphalt 一种基于范围的机械发泡沥青最佳发泡条件识别方法

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

Construction and Building Materials

Pub Date : 2026-04-11 Epub Date: 2026-03-11 DOI: 10.1016/j.conbuildmat.2026.145895

Weiying Wang , Li Gao , Jun Zhang , Youzhi Li , Liping Liu , Mingchen Li

Mechanical foaming of asphalt can effectively reduce mixing and compaction temperatures, thereby ensuring the superior road performance of the resulting asphalt mixtures. However, current indicators for evaluating asphalt foaming performance are largely singular and fixed, failing to reflect the variable temperature, water content, and equipment conditions in actual asphalt plants. Similarly, existing methods for determining optimal foaming conditions rely on laboratory-fixed settings or single metrics, limiting their applicability and reliability for practical field production. In this study, the asphalt foam collapse test (AFCT) was conducted on 70# asphalt, 90# asphalt, and SBS-modified asphalt using a laser sensor system. Based on the four evaluation indicators—expansion ratio (ER), half-life (HL), foam index (FI), and surface area index (SAI)—the foaming performance of three types of asphalt was comprehensively analyzed. Subsequently, the effects of varying water content and foaming temperature on these two indicators were investigated. Unlike the monotonic trends observed in expansion ratio and half-life, both FI and SAI exhibited peak values under specific conditions. Building upon this analysis, interpolation and simulation methods using MATLAB were employed to develop an optimization approach for determining the optimal foaming conditions. Furthermore, the rationality of the proposed optimization method was verified through workability and coating tests of foamed asphalt mixtures. The results demonstrate that the proposed method yields a range of optimal foaming temperatures and water contents rather than a single fixed value, making it more consistent with practical engineering applications.

沥青机械发泡可以有效降低搅拌和压实温度，从而保证所制沥青混合料优越的路用性能。然而，目前评价沥青发泡性能的指标大多是单一和固定的，不能反映实际沥青厂的温度、含水量和设备条件的变化。同样，现有的确定最佳起泡条件的方法依赖于实验室固定设置或单一指标，限制了它们在实际油田生产中的适用性和可靠性。本研究采用激光传感器系统对70#沥青、90#沥青和sbs改性沥青进行了沥青泡沫坍塌试验（AFCT）。基于膨胀率（ER）、半衰期（HL）、泡沫指数（FI）和表面积指数（SAI） 4个评价指标，对3种沥青的发泡性能进行了综合分析。随后，研究了不同含水量和发泡温度对这两项指标的影响。与膨胀比和半衰期的单调趋势不同，FI和SAI在特定条件下均出现峰值。在此基础上，采用MATLAB插值和仿真方法，建立了确定最佳发泡条件的优化方法。通过发泡沥青混合料的和易性和涂覆试验，验证了所提优化方法的合理性。结果表明，该方法可以得到一系列最佳发泡温度和含水量，而不是单一的固定值，更符合实际工程应用。

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引用次数: 0

Shear failure of stainless steel-clad bimetallic reinforced concrete beams 不锈钢包层双金属钢筋混凝土梁的剪切破坏

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

Construction and Building Materials

Pub Date : 2026-04-11 Epub Date: 2026-03-09 DOI: 10.1016/j.conbuildmat.2026.145882

Xiaoping Zhong , Xuhan Wang , Boyang Liu , Wenjie Ge , Jin Xia , Ren-jie Wu , Chunhua Lu , Zhang Jun

Stainless-clad bimetallic steel bar (SCBSB) has garnered significant interest for sustainable infrastructure development due to their exceptional corrosion resistance and cost-effectiveness. This study systematically investigates the shear performance and failure mechanisms of SCBSB-reinforced concrete beams using four-point bending tests. The key parameters examined are the shear span ratio, the stirrup ratio and the reinforcement type (clad stainless steel, solid stainless steel, conventional steel). The influence of these parameters on the failure mode, stiffness development, crack propagation, ultimate load capacity and deformation capacity is examined. The relative importance of these factors is quantified using the SHapley Additive exPlanations (SHAP) method. The results indicate that for shear span ratios between 1 and 3, the SCBSB beams exhibit a typical shear-compression failure mode. The shear capacity increases significantly with a higher stirrup ratio and a lower shear-span ratio, outperforming conventional reinforced concrete beams under equivalent conditions. Furthermore, the width of the critical diagonal crack increases with the shear-span ratio. SHAP analysis reveals that stirrup spacing is the most critical factor influencing the load-carrying capacity, followed by the stirrup ratio and the fracture elongation of the steel reinforcement. This highlights the dominant influence of structural detailing and material ductility on shear performance. Based on the experimental data and mechanistic analysis, a calculation formula for the shear capacity of SCBSB beams is proposed. The calculated values show strong agreement with the experimental results, providing a theoretical basis for the engineering design and optimization of such components. This study clarifies the shear failure mechanisms and key influencing factors for SCBSB beams, thereby providing an important reference for promoting the application of these highly ductile and durable stainless steel-clad rebars in concrete structures.

不锈钢包覆双金属钢筋（SCBSB）由于其优异的耐腐蚀性和成本效益，在可持续基础设施建设中引起了极大的兴趣。本研究采用四点弯曲试验系统地研究了scbsb -钢筋混凝土梁的抗剪性能和破坏机制。检查的关键参数是剪跨比，箍筋比和钢筋类型（包层不锈钢，实心不锈钢，常规钢）。研究了这些参数对破坏模式、刚度发展、裂纹扩展、极限承载能力和变形能力的影响。使用SHapley加性解释（SHAP）方法对这些因素的相对重要性进行量化。结果表明：当剪跨比为1 ~ 3时，SCBSB梁表现为典型的剪切压缩破坏模式；在同等条件下，配箍比越高、剪跨比越小，抗剪能力显著提高，优于传统钢筋混凝土梁。随着剪跨比的增大，临界斜裂缝宽度增大。SHAP分析表明，箍筋间距是影响承载力的最关键因素，其次是箍筋比和钢筋断裂伸长率。这突出了结构细节和材料延展性对抗剪性能的主要影响。在试验数据和力学分析的基础上，提出了SCBSB梁抗剪承载力的计算公式。计算值与试验结果吻合较好，为此类构件的工程设计和优化提供了理论依据。本研究阐明了SCBSB梁的剪切破坏机理及关键影响因素，为促进这种高延性、耐久性的不锈钢包层钢筋在混凝土结构中的应用提供了重要参考。

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引用次数: 0

In situ strategy to overcome the trade-off between deep penetration and high-density crosslinking in adhesives for painted architectural relics conservation 在涂漆建筑文物保护中，克服胶粘剂深层渗透和高密度交联之间权衡的原位策略

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

Construction and Building Materials

Pub Date : 2026-04-11 Epub Date: 2026-03-09 DOI: 10.1016/j.conbuildmat.2026.145788

Xiao-Hai Wu , Ya-Zhou Kang , Jia-Yang Guo , Shao-Hui Guo , Xiao-Jian Bai , Xian-Ming Zhang

Long-term conservation of fragile painted architectural relics demands adhesives that achieve both deep penetration and a high-density crosslinked network. Nevertheless, their simultaneous achievement presents a fundamental challenge. This inherent trade-off originates from the low solubility of highly crosslinked polymers, which impedes penetration and compromises consolidation efficacy. In this study, an efficient in situ crosslinking strategy is proposed to break this trade-off by employing a thiol-functionalized polyorganosiloxane precursor adhesive. This precursor achieves deep infiltration, followed by crosslinking via synergistic solvent-induced self-assembly and Fe³ ⁺ catalysis. Theoretical calculations corroborate that this synergy reduces the energy barrier for disulfide bond formation by 35.4%, enabling controlled in situ crosslinking without damaging painted architectural relics. Moreover, the adhesive demonstrates robust cohesive strength, enabling consolidated samples to maintain stability at 85% RH. These capabilities enable the adhesive to achieve not only stable consolidation but also effective restoration for fragile painted architecture. By modulating the crosslinking density within the flaking pigment layers, the adhesive reduces their elastic modulus by 99.8%, thereby plasticizing the brittle paint and facilitating successful reattachment. The restored regions retain structural integrity even after 1500 h of dry-wet cycling, demonstrating long-term durability. This in situ crosslinking strategy provides an avenue for integrated conservation of cultural heritage.

易碎的涂漆建筑遗迹的长期保护需要粘合剂既能实现深度渗透，又能实现高密度交联网络。然而，它们同时取得的成就提出了一个根本性的挑战。这种固有的权衡源于高交联聚合物的低溶解度，这阻碍了渗透并损害了固结效果。在本研究中，提出了一种有效的原位交联策略，通过采用巯基功能化聚有机硅氧烷前驱体粘合剂来打破这种权衡。该前驱体实现深度浸润，然后通过协同溶剂诱导的自组装和Fe³ +催化发生交联。理论计算证实，这种协同作用将二硫键形成的能量屏障降低了35.4%，实现了可控的原位交联，而不会损坏涂漆的建筑遗迹。此外，粘合剂表现出强大的内聚强度，使固结样品在85% RH下保持稳定性。这些性能使粘合剂不仅可以实现稳定的固结，而且可以有效地修复脆弱的涂漆建筑。通过调节脱落颜料层内的交联密度，粘合剂将其弹性模量降低了99.8%，从而使脆性涂料塑化并促进成功的再附着。修复后的区域即使在1500 h的干湿循环后仍保持结构完整性，显示出长期的耐久性。这种原位交联策略为文化遗产的综合保护提供了一条途径。

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引用次数: 0

Investigation on all-component rejuvenation mechanism of bio-oil and epoxy compound in aged SBS modified bitumen 老化SBS改性沥青中生物油和环氧复合物全组分年轻化机理的研究

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

Construction and Building Materials

Pub Date : 2026-04-11 Epub Date: 2026-03-11 DOI: 10.1016/j.conbuildmat.2026.145900

Song Xu , Xiangjie Niu , Shilong Pan , Guoxiang Li , Shuai Yang , Lei Fang , Zhilong Cao , Hongyan Ma , Xiaojuan Jia

The success of all-component rejuvenation of aged SBS modified bitumen (SMB) hinges on the effective synergy between conventional and reactive rejuvenators. However, distribution, diffusion, and interaction pathways of the two types of rejuvenators within aged SMB may interfere with each other, which could compromise rejuvenation effectiveness and have not been thoroughly investigated to date. In order to investigate the synergistic mechanism between reactive and conventional rejuvenators, a composite reactive rejuvenator consisting of bio-oil and the epoxy compound was developed, and five rejuvenation strategies were proposed. The effectiveness of each strategy was evaluated through the physical property test, toughness test, and rheological test. Moreover, the rejuvenation mechanism and synergistic interaction pathways were explored using Fourier transform infrared spectroscopy and fluorescence microscopy tests. Results show that bio-oil helps restore the component balance of aged SMB but cannot repair broken SBS, whereas 1,6-hexanediol diglycidyl ether (HDE) is capable of chemically reconstructing the SBS network structure. As for the composite rejuvenation strategy involving HDE and bio-oil, bio-oil interferes with HDE effectiveness on degraded SBS. On one hand, bio-oil contains active compounds that engage in reactions with degraded SBS, on the other hand, they compete with degraded SBS to react with the epoxy compound. This interference significantly diminishes the effect of HDE on broken SBS and the crosslinking density of reconstructed SBS network structure, which results in decreased ductility, toughness, and high-temperature rutting resistance of rejuvenated SMB. It is imperative that the epoxy compound undergo complete reaction with degraded SBS beforehand to prevent interference caused by bio-oil, which eliminates potential active sites susceptible to reaction with bio-oil. These findings support a well-founded theoretical perspective and provide essential practical insights for the design of reactive rejuvenation strategies and the enhancement of effectiveness.

SBS改性沥青全组分返老还衰的成功与否取决于常规返老还衰剂和活性返老还衰剂之间的有效协同作用。然而，两种类型的返老还童剂在衰老的SMB中的分布、扩散和相互作用途径可能相互干扰，从而影响返老还童的效果，迄今尚未得到充分的研究。为探讨活性型和常规型回春剂的协同增效机理，研制了一种由生物油和环氧化合物组成的复合活性型回春剂，并提出了5种回春策略。通过物理性能测试、韧性测试和流变学测试来评估每种策略的有效性。利用傅里叶变换红外光谱和荧光显微镜实验，探讨了复嫩机理和协同作用途径。结果表明，生物油有助于恢复老化的SMB的组分平衡，但不能修复断裂的SBS，而1,6-己二醇二缩水甘油醚（HDE）能够化学重建SBS的网络结构。对于含有HDE和生物油的复合年轻化策略，生物油会干扰HDE对降解SBS的效果。生物油一方面含有与降解SBS发生反应的活性化合物，另一方面又与降解SBS竞争与环氧化合物发生反应。这种干扰显著减弱了HDE对SBS断裂和重建SBS网络结构交联密度的影响，导致再生SMB的延展性、韧性和高温车辙抗力下降。为了防止生物油的干扰，环氧化合物必须事先与降解SBS完全反应，从而消除易与生物油反应的潜在活性位点。这些发现支持了一个有充分根据的理论观点，并为设计反应性年轻化策略和提高有效性提供了重要的实践见解。

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引用次数: 0

Experimental investigation of modified magnesite-based composite phase change materials for advanced thermal management in buildings 用于建筑高级热管理的改性镁基复合相变材料试验研究

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

Construction and Building Materials

Pub Date : 2026-04-11 Epub Date: 2026-03-11 DOI: 10.1016/j.conbuildmat.2026.145896

Kaoutar Moulakhnif , Abdelkoddouss El Majd , Youssef Cafi , Fadila El Kouihen , Said Sair , Abdessamad Faik , Abdeslam El Bouari

The growing global need for sustainable energy management has accelerated research into efficient thermal energy storage (TES) technologies that can offset intermittent renewable energy sources. Phase change materials (PCMs), particularly organic types, have emerged as promising candidates due to their high latent heat storage capacity and reversible thermal behavior. However, their practical use is still hampered by low thermal conductivity and leakage during phase transitions. This study investigates, for the first time, the use of raw and calcined magnesite as natural, low-cost, and environmentally friendly support matrices for 1-dodecanol PCMs. Natural magnesite (MgCO₃) was thermally converted into magnesium oxide (MgO) through calcination, resulting in a porous structure favorable for PCM encapsulation. Comprehensive characterization using FTIR, XRD, BET, SEM, TGA, and DSC revealed that calcination at 800 °C significantly enhanced the surface area and pore structure, improving both PCM loading and thermal stability. The optimized DO@Mag-800 composite achieved the highest PCM encapsulation ratio of 52%, with a latent heat of fusion of 101.2 kJ/kg at a melting temperature of 16.31 °C and an improved thermal conductivity of 0.702 W/(m.K). Furthermore, DO@Mag-800 composite has also been incorporated into concrete at varying ratios, demonstrating good mechanical strength and thermal regulation capabilities for low-temperature building applications.

全球对可持续能源管理日益增长的需求加速了对高效热能储存（TES）技术的研究，这种技术可以抵消间歇性的可再生能源。相变材料（PCMs），特别是有机相变材料，由于其高潜热储存能力和可逆热行为而成为有希望的候选者。然而，它们的实际应用仍然受到低导热性和相变时泄漏的阻碍。本研究首次研究了使用生菱镁矿和煅烧菱镁矿作为天然、低成本、环保的1-十二醇PCMs支撑基质。天然菱镁矿（MgCO3）经煅烧热转化为氧化镁（MgO），形成有利于PCM包封的多孔结构。通过FTIR、XRD、BET、SEM、TGA和DSC的综合表征表明，在800℃下煅烧显著增强了材料的表面积和孔隙结构，提高了PCM的负载和热稳定性。优化后的DO@Mag-800复合材料的PCM包封率最高，达到52%，在16.31℃的熔融温度下，熔合潜热达到101.2 kJ/kg，导热系数提高到0.702 W/(m.K)。此外，DO@Mag-800复合材料也以不同的比例掺入混凝土中，在低温建筑应用中表现出良好的机械强度和热调节能力。

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引用次数: 0

Development of smart engineered cementitious composites with integrated self-sensing capability and enhanced tensile ductility 具有集成自感知能力和增强拉伸延性的智能工程胶凝复合材料的开发

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

Construction and Building Materials

Pub Date : 2026-04-11 Epub Date: 2026-03-12 DOI: 10.1016/j.conbuildmat.2026.145931

Menghuan Guo , Hao Shen , Yingwu Zhou , Yinghui Wu , Zhongfeng Zhu

This work elucidates the coupled mechano-electrical behaviour of carbon black-engineered cementitious composites (CB-ECC) by resolving critical conflicts between tensile ductility (≥6.7% strain capacity) and electrical conductivity. The CB content near the percolation threshold of 1.0%–1.5% can synchronise strain-hardening characteristics with stable piezoresistive response through deliberate tailoring of ECC’s components. Excessive CB content (≥2.0%) leads to agglomeration, increased porosity, and reduced mechanical properties, while also destabilising the conductive network under wet conditions. The developed self-sensing ECC represents a class of multifunctional smart materials that intrinsically integrate structural load-bearing capacity with real-time strain/stress monitoring functionality, enabling simultaneous large deformation capacity and highly sensitive piezoresistive response. These findings provide critical insights into material design and optimisation for intelligent infrastructure applications.

本研究通过解决拉伸延性（≥6.7%应变容量）和导电性之间的关键冲突，阐明了炭黑工程胶凝复合材料（CB-ECC）的耦合力学行为。在渗透阈值1.0% ~ 1.5%附近的CB含量，通过对ECC构件的精心剪裁，可以使应变硬化特性与稳定的压阻响应同步。过量的CB含量（≥2.0%）会导致结块、孔隙率增加和机械性能降低，同时在潮湿条件下也会破坏导电网络的稳定性。开发的自传感ECC代表了一类多功能智能材料，它本质上集成了结构承载能力和实时应变/应力监测功能，同时实现了大变形能力和高灵敏度的压阻响应。这些发现为智能基础设施应用的材料设计和优化提供了重要见解。

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引用次数: 0

A physically consistent nonlocal multi‑scale damage model for quasi‑brittle materials with numerical simulation and experimental benchmarking 基于数值模拟和实验基准的准脆性材料非局部多尺度损伤模型

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

Construction and Building Materials

Pub Date : 2026-04-11 Epub Date: 2026-03-11 DOI: 10.1016/j.conbuildmat.2026.145918

Zhou Huang , Lian Shen , Xiaowang Pan , Renze Xu , Shuwen Deng , Lan Xie , Ping Xiang

In this study, a physically consistent nonlocal multi-scale damage model is proposed to characterize the fracture behavior of quasi-brittle materials under quasi-static and high-strain-rate loading scenarios. A strain-rate-dependent microstructural length scale and a stress-state-sensitive damage evolution law are integrated into the model to ensure mesh objectivity and stabilize the post-peak damage response. Through asymptotic homogenization, the evolution of microcracks is coupled with macroscopic stress fields, facilitating the physical consistency of multi-scale damage. Numerical implementation and experimental validation demonstrate the model’s capability to reproduce fracture characteristics under uniaxial compression. For the perforated prismatic specimen, the simulated peak stress reached 29.0 MPa, the critical strain was near 1.0 × 10⁻³, and crack growth up to 60 mm within 2.5 s. In mixed-mode fracture scenarios, the transition from tensile-shear to tensile-dominated failure is captured by the proposed model as flaw geometry varies. Under dynamic tensile scenarios, the critical transition from stable type I cracking to crack branching and type II-dominated failure at 1150 mm/s in the L-shaped specimen test. For this test at 2400 mm/s, the simulated peak load deviates by less than 2% from experimental measurements. Consistent crack morphologies across mesh resolutions further confirm the robustness, efficiency, and applicability of the proposed model in high-rate fracture simulations of quasi-brittle materials.

在本研究中，提出了一种物理一致的非局部多尺度损伤模型来表征准脆性材料在准静态和高应变率加载下的断裂行为。该模型采用应变率相关的细观结构长度尺度和应力状态敏感的损伤演化规律，保证了网格的客观性和峰后损伤响应的稳定性。通过渐近均质化，微裂纹的演化与宏观应力场耦合，促进了多尺度损伤的物理一致性。数值实现和实验验证表明，该模型能够再现单轴压缩下的断裂特征。多孔柱状试样的模拟峰值应力达到29.0 MPa，临界应变接近1.0 × 10−3，裂纹扩展在2.5 s内达到60 mm。在混合模式断裂情况下，随着裂纹几何形状的变化，所提出的模型可以捕捉到从拉伸-剪切到拉伸主导破坏的转变。在动态拉伸场景下，l型试样在1150 mm/s的速度下，从稳定的I型开裂过渡到裂纹分支和ii型为主破坏。在2400 mm/s的测试中，模拟峰值负载与实验测量值的偏差小于2%。不同网格分辨率下一致的裂纹形态进一步证实了该模型在准脆性材料高速率断裂模拟中的鲁棒性、有效性和适用性。

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引用次数: 0

Optimizing acoustic and mechanical properties of stone matrix asphalt for enhanced noise reduction using response surface methodology 利用响应面方法优化石基沥青的声学和力学性能，以增强降噪效果

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

Construction and Building Materials

Pub Date : 2026-04-11 Epub Date: 2026-03-10 DOI: 10.1016/j.conbuildmat.2026.145902

Mutahar Al-Ammari , Ruikun Dong , Shunfan Luo

The complex interplay of constituents in asphalt mixtures complicates the prediction of acoustic performance. This study employs Response Surface Methodology (RSM) to systematically model and optimize the composition of Stone Mastic Asphalt (SMA-13) for enhanced noise reduction and mechanical durability. This study developed highly significant (p < 0.0001) second-order polynomial models (R² > 0.95) that accurately capture the nonlinear relationships between mix design and key performance indicators: sound absorption coefficient, dynamic stability, freeze-thaw splitting strength ratio, and tire-pavement vibration damping. Analysis revealed distinct mechanistic influences: sound absorption was governed by the fine-aggregate-and-bitumen-mediated air-void network, whereas dynamic stability depended on a balanced coarse aggregate skeleton. These models enabled the successful formulation of an optimized mixture, which was experimentally validated to exhibit enhanced performance, with: noise absorption coefficient of 0.175, dynamic stability of 6699 Times/s, tensile strength ratio of 92.8%, and damping capacity of 7.48—with all predicted values falling within 5% of experimental results.

沥青混合料中成分的复杂相互作用使声学性能的预测复杂化。本研究采用响应面法（RSM）系统建模和优化石胶沥青（SMA-13）的组成，以增强降噪和机械耐久性。本研究建立了高度显著（p <； 0.0001）的二阶多项式模型（R²> 0.95），该模型准确地捕捉了混合料设计与关键性能指标（吸声系数、动力稳定性、冻融裂强度比和轮胎-路面振动阻尼）之间的非线性关系。分析揭示了不同的机制影响：吸声是由细骨料和沥青中介的空隙网络控制的，而动态稳定性取决于平衡的粗骨料骨架。经过实验验证，该混合料的噪声吸收系数为0.175，动态稳定性为6699次/秒，抗拉强度比为92.8%，阻尼能力为7.48，预测值均在实验结果的5%以内。

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引用次数: 0

Experimental investigation on the evolution of static and hysteretic properties of structural steel after 25 years atmospheric corrosion 结构钢25年大气腐蚀后静滞性能演变的试验研究

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

Construction and Building Materials

Pub Date : 2026-04-11 Epub Date: 2026-03-10 DOI: 10.1016/j.conbuildmat.2026.145879

Qi Guo , Longchang Wei , Ying Xing , Yan Lu , Jingwei Lu

Long-term atmospheric corrosion poses a significant challenge to the safety and durability of steel structures. This study investigates the long-term deterioration mechanisms and mechanical performance of Q355 steel subjected to 25 years of natural atmospheric corrosion. Surface morphology scanning, monotonic tensile tests, and cyclic loading tests were conducted to quantify corrosion-induced degradation and to develop corresponding constitutive models. Linear relationships were identified between roughness parameters, expected pit depth (h_pit), and the mass-loss rate (ρ_m). Notably, when ρ_m exceeds 8.02%, h_pit under atmospheric exposure grows markedly faster than in the continuous neutral salt spray (CNSS). Monotonic tensile tests revealed a transition from ductile (Grades I–II) to brittle fracture (Grade III) with increasing corrosion severity, and linear degradation equations were derived for strength and deformation indices as functions of ρ_m. A modified trilinear static constitutive model incorporating a corrosion-dependent factor was proposed, improving strain-hardening accuracy by up to 47.31%. Under cyclic loading, the energy dissipation coefficient (E_n) decreased linearly with ρ_m, while cyclic softening and strain-hardening indicators exhibited exponential degradation. A hysteretic constitutive model accounting for both ρ_m and cyclic strain was further established and calibrated. Comparisons with experimental results confirm that the proposed framework accurately reproduces the hysteretic behavior of atmospherically corroded steel, providing a reliable basis for structural performance assessment under long-term corrosion.

长期大气腐蚀对钢结构的安全性和耐久性提出了重大挑战。研究了Q355钢在25年自然大气腐蚀下的长期劣化机理和力学性能。通过表面形貌扫描、单调拉伸试验和循环加载试验来量化腐蚀引起的退化，并建立相应的本构模型。粗糙度参数、期望坑深（hpit）和质量损失率（ρm）之间存在线性关系。当ρm大于8.02%时，hpit在大气暴露下的生长速度明显快于连续中性盐雾（CNSS）。单调拉伸试验表明，随着腐蚀严重程度的增加，腐蚀体从延性断裂（I-II级）向脆性断裂（III级）过渡，并建立了强度和变形指标随ρm的线性退化方程。提出了一种包含腐蚀相关因素的改进的三线性静态本构模型，将应变硬化精度提高了47.31%。循环加载下，能量耗散系数（En）随ρm线性降低，循环软化和应变硬化指标呈指数级衰减。在此基础上，建立并标定了兼顾ρm和循环应变的滞回本构模型。通过与试验结果的比较，验证了该框架能准确再现大气腐蚀钢的滞回行为，为长期腐蚀下的结构性能评估提供了可靠的依据。

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引用次数: 0

Characterizing compressive failure mechanisms of cement stabilized reclaimed asphalt pavement: A combined approach using energy dissipation theory, acoustic emission, digital image correlation, and discrete element method 表征水泥稳定再生沥青路面压缩破坏机制：一种结合能量耗散理论、声发射、数字图像相关和离散元法的方法

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

Construction and Building Materials

Pub Date : 2026-04-11 Epub Date: 2026-03-10 DOI: 10.1016/j.conbuildmat.2026.145885

Haidong Ji, Fucheng Guo, Tengfei Yao, Xu Wu, Hao Wen, Bo Li

Cement stabilized reclaimed asphalt pavement (CSRAP) is promising for recycled base layers, yet its compressive damage and instability remain unclear under loading. Unconfined compression tests were integrated with energy analysis, acoustic emission (AE), digital image correlation (DIC), and discrete element method (DEM) to clarify deformation and failure mechanisms. The results showed that the energy evolution of CSRAP mixtures can be divided into four stages: compaction, elastic, elastoplastic, and failure. The binary nonlinear response model effectively reflects the influence patterns of curing time and RAP content on peak strength and peak energy metrics. RA-AF features indicate coexistence of tensile and shear dominated events, with increasing RAP shifting damage toward shear-type activity, while curing effects are mixture-dependent. DIC shows deformation transitioning from dispersed fields to localized bands, and high RAP specimens exhibit multiple localization zones. DEM reveals reduced force-chain continuity and more distributed fracture-enhanced regions as RAP increased. The research findings can provide reference for identifying stages in the evolution of compressive damage in CSRAP base materials and determining their instability characteristics.

水泥稳定再生沥青路面（CSRAP）是一种很有前景的再生基层材料，但其在荷载作用下的压缩损伤和失稳尚不清楚。将无侧限压缩试验与能量分析、声发射（AE）、数字图像相关（DIC）和离散元法（DEM）相结合，以阐明变形和破坏机制。结果表明：CSRAP混合料的能量演化可分为压实、弹性、弹塑性和破坏四个阶段；二元非线性响应模型有效地反映了固化时间和RAP含量对峰值强度和峰值能量指标的影响规律。RA-AF特征表明拉伸和剪切主导事件共存，RAP向剪切型活性转移损伤增加，而固化效果则依赖于混合物。DIC表现为从分散场到局部化带的变形过渡，高RAP试样表现为多个局部化带。DEM显示，随着RAP的增加，力链连续性降低，裂缝增强区域更加分布。研究结果可为识别CSRAP基材压缩损伤演化阶段及确定其失稳特征提供参考。

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