Construction and Building Materials最新文献_第6页

Study on the effects of waste polyethylene wax on the colloidal structure of asphalt based on dissipative dynamics 基于耗散动力学的废聚乙烯蜡对沥青胶态结构影响研究

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

Construction and Building Materials

Pub Date : 2026-01-27 DOI: 10.1016/j.conbuildmat.2026.145364

Lin Chen , Ming Liang , Zhenchao Chen , Xue Xin , Linping Su , Xingchi Zhao , Jing Gao , Junyao hui , Xuehao Luan , Xin Wang , Zhanyong Yao

The asphalt industry has considerable potential to valorize waste plastics; however, the modification mechanism of wax-based pyrolysis products still lacks quantitative metrics and robust validation. In this study, the microstructural characteristics of linear low-density polyethylene pyrolysis wax were characterized using gel permeation chromatography, Fourier-transform infrared spectroscopy, and proton nuclear magnetic resonance. A pyrolysis wax-asphalt system was then constructed via molecular dynamics modeling. By integrating the Flory-Huggins interaction parameter, repulsion parameters, and related descriptors, a quantitative evaluation framework was established to elucidate how pyrolysis wax alters asphalt colloidal structure and inter-component interactions. The results indicate that pyrolysis wax, a highly saturated and non-polar polyethylene-derived alkane, preferentially forms a homogeneous phase with the saturates fraction, whereas it exhibits pronounced repulsion toward aromatics, resins, and asphaltenes. This incompatibility selectively displaces aromatics and resins and promotes localized aggregation. Four-fraction tests and fluorescence microscopy observations further corroborate the proposed mechanism, providing a theoretical basis for the efficient utilization of waste-plastic-derived pyrolysis wax in asphalt applications.

沥青工业有相当大的潜力使废塑料增值；然而，蜡基热解产物的改性机理仍缺乏定量指标和可靠的验证。本研究采用凝胶渗透色谱、傅里叶变换红外光谱、质子核磁共振等手段对线性低密度聚乙烯热解蜡的微观结构特征进行了表征。然后通过分子动力学建模构建了热解蜡-沥青体系。通过整合Flory-Huggins相互作用参数、斥力参数及相关描述符，建立定量评价框架，阐明热解蜡如何改变沥青胶体结构及组分间相互作用。结果表明，热解蜡是一种高度饱和、非极性的聚乙烯衍生烷烃，它优先与饱和组分形成均一相，而对芳烃、树脂和沥青质表现出明显的排斥。这种不相容性选择性地取代芳烃和树脂，促进局部聚集。四组分试验和荧光显微镜观察进一步证实了上述机理，为废塑料热解蜡在沥青应用中的高效利用提供了理论依据。

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引用次数: 0

A study on graphene-steel fiber cementitious sensing coatings for structural health monitoring 结构健康监测用石墨烯-钢纤维胶凝传感涂层研究

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

Construction and Building Materials

Pub Date : 2026-01-27 DOI: 10.1016/j.conbuildmat.2026.145394

Jiu-Si Zhang , Shan Zhu , Bo-Xin Wang , Wei Zhou , Zi-Ming Liu , Yu-Xi Yang

Structural health monitoring (SHM) plays a vital role in ensuring the long-term safety of civil infrastructure. However, conventional sensing elements often suffer from durability and interfacial issues with mortar substrates. To overcome these limitations, this study proposes a homogeneous sensing coating fabricated from graphene–steel fiber synergistically reinforced conductive cement mortar (SFGCM) to enhance both durability and interfacial bonding. A two-stage experimental program was conducted. First, mixes with different graphene and steel fiber contents were tested to balance mechanical strength and piezoresistive sensitivity, leading to the identification of an optimal proportion. Second, the optimized SFGCM mortar was then applied as a surface coating layer on mortar substrates with different thicknesses for crack-sensing evaluation. Three-point bending tests and load–deflection–resistance measurements were carried out to assess monitoring capability. The results reveal that the synergistic interaction between graphene and steel fibers forms a multiscale conductive network responsible for a strong piezoresistive effect. The optimal mix (“GCS-2–3”) showed the lowest initial resistance and a resistance change rate of 104 %. Among the three tested coating thicknesses (5, 10 and 15 mm), increasing the coating thickness to 15 mm resulted in a maximum resistance change rate of 213 %. Effective interfacial treatment ensured cooperative cracking and reliable signal transmission. This study demonstrates the feasibility and high performance of graphene–steel fiber homogeneous sensing coatings for crack detection and highlights their potential for reliable and intelligent structural health monitoring.

结构健康监测是保障民用基础设施长期安全运行的重要手段。然而，传统的传感元件经常遭受耐久性和砂浆基板的界面问题。为了克服这些限制，本研究提出了一种由石墨烯-钢纤维协同增强导电水泥砂浆（SFGCM）制成的均匀传感涂层，以提高耐久性和界面粘合。进行了两个阶段的实验方案。首先，测试了不同石墨烯和钢纤维含量的混合材料，以平衡机械强度和压阻灵敏度，从而确定最佳比例。其次，将优化后的SFGCM砂浆作为表面涂层涂覆在不同厚度的砂浆基材上，进行裂缝感知评价。进行了三点弯曲试验和负载-挠曲阻力测量，以评估监测能力。结果表明，石墨烯和钢纤维之间的协同相互作用形成了一个多尺度导电网络，负责强压阻效应。最佳组合“GCS-2-3”的初始抗性最低，抗性变化率为104 %。在3种涂层厚度（5、10和15 mm）中，当涂层厚度增加到15 mm时，最大电阻变化率为213 %。有效的界面处理保证了协同破解和可靠的信号传输。该研究证明了石墨烯-钢纤维均匀传感涂层用于裂纹检测的可行性和高性能，并强调了其在可靠和智能结构健康监测方面的潜力。

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引用次数: 0

Enhancement effects of CO2 curing on biochar modified construction solid waste: Mechanical properties, microstructure, and carbon sequestration evaluation CO2固化对生物炭改性建筑固体废物的强化作用：力学性能、微观结构及固碳评价

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

Construction and Building Materials

Pub Date : 2026-01-27 DOI: 10.1016/j.conbuildmat.2026.145381

Wei Wang , Hongxiang Wu , Na Li , Zhengsheng Che , Jun Hu , Jianfeng Wang , Guoxiong Mei

The proper disposal of construction solid waste has long been a subject of widespread concern. In this study, rice husk biochar was incorporated into construction solid waste to form a composite system, which was subsequently subjected to carbonation curing under different CO₂ concentrations. The mechanical properties of specimen were evaluated through unconfined compressive strength (UCS) and triaxial compression tests, while its microstructural characteristics, phase composition, pore structure, and carbon sequestration capacity were investigated using SEM, XRD, EDS, FTIR, MIP, and TGA analyses. The results reveal that: (1) CO₂ curing significantly enhances the UCS, E₅₀, and peak deviatoric stress of specimen, with the most pronounced improvement observed at a CO₂ concentration of 40 %. (2) The carbonation reaction generates CaCO₃, which effectively fills the mesopores and macropores of specimen, increases the proportion of gel pores. (3) CO₂ curing remarkably improves the relative carbon sequestration of specimen, reaching a maximum value of 3.4 % at 60 % CO₂ concentration.

长期以来，建筑固体废物的妥善处理一直是人们普遍关注的问题。本研究将稻壳生物炭掺入建筑固体废物中，形成复合体系，在不同CO2浓度下进行碳化固化。通过无侧限抗压强度（UCS）和三轴压缩试验评估了试样的力学性能，并通过SEM、XRD、EDS、FTIR、MIP和TGA分析了试样的微观组织特征、相组成、孔隙结构和固碳能力。结果表明：(1)CO2固化显著提高了试样的UCS、E50和峰值偏应力，其中CO2浓度为40% %时改善最为明显；(2)碳化反应生成的CaCO3有效填充了试样的中孔和大孔，增加了凝胶孔的比例。(3) CO2固化显著提高了试样的相对固碳量，在CO2浓度为60 %时达到最大值3.4 %。

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引用次数: 0

Experimental study on the flexural capacity of engineered bamboo and timber beams subjected to outdoor natural aging 室外自然老化下工程竹木梁抗弯承载力试验研究

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

Construction and Building Materials

Pub Date : 2026-01-27 DOI: 10.1016/j.conbuildmat.2026.145387

Qingfeng Xu , Ci Song , Yubing Leng , Kent A. Harries , Mingqian Wang , Lingzhu Chen

The flexural performance of Douglas fir glue-laminated timber (DF), laminated bamboo (LB), and bamboo scrimber (BS) beams subjected to outdoor natural aging exposure lasting up to five years in a humid subtropical climate is reported. With increased duration of exposure, the surface of the three kinds of beams developed mold spots, cracks, and adhesive layer cracking. Third-point bending tests were performed on the large-scale, 3620 mm × 100 mm × 190 mm beams following 0 (control), 1-, 2-, 3-, and 5-year exposure. Material characterization, including bending and parallel-to-grain compressive properties, etc., was conducted at 0, 1, and 5 years. All beams were dominated by tension-controlled flexure, exhibiting fiber rupture at the beam soffits followed by intra-laminar tearing along the fibers. Load-deflection behavior is essentially brittle-elastic. The densified BS material exhibited the greatest strength and stiffness. LB, though stronger than DF, was not as stiff. Strain data confirmed that the laminated materials continued to act in a composite manner despite evidence of adhesive degradation. After five years of natural aging, the load-bearing capacity retention of BS, LB, and DF beams was 91 %, 84 %, and 69 %, respectively, while the corresponding stiffness retention was 97 %, 92 %, and 84 %, demonstrating that BS exhibits superior long-term flexural performance and durability compared to LB and DF under prolonged outdoor exposure.

本文报道了道格拉斯冷杉胶合木材（DF）、层压竹（LB）和竹材（BS）梁在潮湿的亚热带气候下经受室外自然老化暴露长达五年的抗弯性能。随着暴露时间的增加，三种梁的表面出现了霉斑、裂纹和粘接层开裂。在0（对照）、1年、2年、3年和5年暴露后，对大型、3620 mm × 100 mm × 190 mm梁进行了第三点弯曲试验。材料表征，包括弯曲和平行颗粒压缩性能等，分别在0,1和5年进行。所有梁都以张力控制弯曲为主，在梁的软肋处表现出纤维断裂，然后沿着纤维层内撕裂。载荷-挠曲行为本质上是脆性-弹性的。致密化的BS材料表现出最大的强度和刚度。LB虽然比DF强壮，但没有DF那么僵硬。应变数据证实，尽管有粘合剂降解的证据，层压材料继续以复合方式起作用。经过5年的自然老化，BS、LB和DF梁的承载能力保持率分别为91 %、84 %和69 %，而相应的刚度保持率分别为97 %、92 %和84 %，表明在长时间的户外暴露下，BS比LB和DF具有更好的长期抗弯性能和耐久性。

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引用次数: 0

Evaluating the long-term cracking and oxidation resistance of asphalt binder incorporating bio-based additives 含生物基添加剂的沥青粘结剂的长期抗裂性和抗氧化性评价

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

Construction and Building Materials

Pub Date : 2026-01-26 DOI: 10.1016/j.conbuildmat.2026.145398

Ziyao Wei , Angelo Filonzi , Gaylon Baumgardner , Amit Bhasin

Bio-based additives exhibited considerable promise for enhancing pavement durability, restoring aged asphalt materials, and lowering maintenance costs. In this study, the effect of bio-based additives on the long-term cracking and oxidation resistance of asphalt binders was investigated through rheological characterization, chemical analysis, and a novel fracture test. Bio-based additives were blended with asphalt binders designed to evaluate the influence of different bio-based additives, different base binders, and varying additive dosages. All blends were then subjected to extended long-term aging. Results demonstrate that bio-based additives provide a sustained softening effect to asphalt binders under long-term aging. They also enhance long-term aging resistance of binders by reducing stiffness sensitivity rather than limiting the formation of oxidation functional groups. As an innovative and fundamental cracking test, the poker-chip test offers primary evidence that bio-based additives significantly enhance the long-term cracking resistance of asphalt binders, with complementary support from the Glover–Rowe parameter. Poker-chip ductility provides improved sensitivity in distinguishing long-term cracking performance of bio-based additives. A Critical Aging Duration parameter is introduced; this parameter indicates that the service life of asphalt binders against cracking and oxidation can often be more than doubled after incorporating bio-based additives. In terms of softening mechanisms, bio-based additives provide a relatively steady effect on stiffness and viscoelasticity across aging conditions, whereas their improvement in ductility becomes more substantial as aging progresses. Sterol-rich bio-based additives demonstrate superior potential for both modifying rheological performance and improving cracking resistance. These findings also emphasize the importance of fracture-based evaluation for accurately assessing binder durability.

生物基添加剂在提高路面耐久性、修复老化沥青材料和降低维护成本方面表现出相当大的前景。本研究通过流变学表征、化学分析和新型断裂试验，研究了生物基添加剂对沥青粘结剂长期开裂和抗氧化性能的影响。将生物基添加剂与沥青粘结剂混合，旨在评估不同生物基添加剂、不同基础粘结剂和不同添加剂用量对沥青的影响。然后，所有的混合物都要经过长时间的陈化。结果表明，生物基添加剂对沥青结合料在长期老化下具有持续的软化作用。它们还通过降低刚度敏感性而不是限制氧化官能团的形成来增强粘合剂的长期耐老化性。作为一项创新性的基础开裂试验，扑克牌试验提供了初步证据，证明生物基添加剂显著提高了沥青粘合剂的长期抗裂性，并得到了Glover-Rowe参数的补充支持。扑克牌片的延展性提高了区分生物基添加剂长期开裂性能的灵敏度。引入临界老化时间参数；该参数表明，加入生物基添加剂后，沥青粘合剂抗开裂和氧化的使用寿命通常可以增加一倍以上。就软化机制而言，生物基添加剂在老化条件下对刚度和粘弹性提供相对稳定的影响，而随着老化的进行，它们对延性的改善变得更加明显。富含甾醇的生物基添加剂在改变流变性能和提高抗裂化性能方面表现出优异的潜力。这些发现也强调了基于裂缝的评估对于准确评估粘合剂耐久性的重要性。

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引用次数: 0

Deep learning-based high-throughput mesomechanical analysis framework for particulate composites 基于深度学习的颗粒复合材料高通量细观力学分析框架

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

Construction and Building Materials

Pub Date : 2026-01-26 DOI: 10.1016/j.conbuildmat.2026.145403

Xin Wei , Lihua Zhao , Yiren Sun

A deep learning (DL)-based high-throughput mesomechanical analysis framework for particulate composites is presented to accelerate material optimization through efficient performance-oriented virtual screening of mesostructural configurations, bypassing computationally inefficient finite element (FE) analysis. A dual-attention U-Net (DA-UNet) is first developed by integrating both the channel and spatial attention mechanisms into the U-Net to capture the pixel-level details associated with the interactions between particles. For rapid acquisition of training datasets, a pixelated random particle generation method is proposed, which can efficiently generate mesostructures containing particles with highly varied concave shapes, distributions, and sizes. The effectiveness of this framework is validated in two steps. First, the DA-UNet is trained to predict the temperature-dependent mechanical fields in 400 mesostructures of asphalt concrete with particle area fractions varying from 37.3 % to 59.8 %. Then, a high-throughput analysis is conducted on 3000 mesostructures of asphalt concrete with identical filling rates but varied aggregate gradations to screen out the most and the least desirable gradations. The results indicate that the DA-UNet acts as an accurate surrogate for FE models while achieving 50,000-fold computational acceleration. This acceleration reduces the analysis time for 3000 mesostructures from approximately 50 days of continuous FE simulation to just 80 s, making rapid virtual screening feasible. The proposed framework enables data-driven design optimization of particulate composites through rapid mesostructure generation and efficient performance-oriented screening.

提出了一种基于深度学习（DL）的高通量颗粒复合材料细观力学分析框架，通过高效的以性能为导向的细观结构构型虚拟筛选来加速材料优化，从而绕过计算效率低下的有限元（FE）分析。双注意U-Net （DA-UNet）首先通过将通道和空间注意机制集成到U-Net中来捕获与粒子之间相互作用相关的像素级细节。为了快速获取训练数据集，提出了一种像素化随机粒子生成方法，该方法可以有效地生成包含凹形状、分布和大小变化很大的粒子的介结构。通过两个步骤验证了该框架的有效性。首先，对DA-UNet进行训练，以预测400种沥青混凝土细观结构中与温度相关的力学场，颗粒面积分数从37.3 %到59.8 %不等。然后，对填充率相同但骨料级配不同的3000种沥青混凝土细观结构进行了高通量分析，筛选出最理想和最不理想的级配。结果表明，DA-UNet可以作为有限元模型的精确替代品，同时实现5万倍的计算速度。这种加速将3000个细观结构的分析时间从大约50天的连续有限元模拟缩短到80 s，使快速虚拟筛选成为可能。该框架通过快速生成细观结构和高效的性能筛选，实现了颗粒复合材料的数据驱动设计优化。

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引用次数: 0

Thermally activated red mud as a high-volume substitute for MgO on magnesium phosphate cement: From microstructure to macro-properties 热活化赤泥作为磷酸镁水泥上MgO的大体积替代品：从微观结构到宏观性能

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

Construction and Building Materials

Pub Date : 2026-01-26 DOI: 10.1016/j.conbuildmat.2026.145343

Yao Xiao , Ronghan Wu , Bing Chen , Min Dai

Red mud, a major solid waste from the aluminium industry, often exhibits low reactivity when directly blended into magnesium phosphate cement (MPC) due to the presence of inert minerals. Thermal activation is an effective approach to enhancing its reactivity. This study investigates the feasibility of incorporating high-volume (60 %) thermally treated red mud as a partial substitute for MgO in MPC and evaluates its effects on material properties. Results indicate that as the calcination temperature of red mud increases, the peak hydration heat of MPC gradually rises, with the peak onset occurring earlier. The compressive strength of MPC pastes incorporating red mud calcined at 900 ℃ increased by 7.41 % compared to pure MPC pastes at 28 days of hydration. Microstructural analysis reveals that red mud calcined at 900 ℃ promoted the formation of struvite, the primary hydration product, while also generating a cementitious phase derived from gehlenite. The micro-aggregate effect of hematite and the filling action of the composite cementitious phase synergistically enhanced density and interfacial strength of the system. This study demonstrates that high-temperature calcined red mud serves as a high-performance, low-cost admixture for MPC, contributing to both of solid waste resource utilization and performance improvement of MPC. The findings provide theoretical support for the engineering application of red mud-based cementitious materials.

红泥是铝工业的一种主要固体废物，由于惰性矿物的存在，当直接与磷酸镁水泥（MPC）混合时，通常表现出低反应性。热活化是提高其反应活性的有效途径。本研究探讨了在MPC中加入大体积（60% %）热处理赤泥作为MgO部分替代品的可行性，并评估了其对材料性能的影响。结果表明：随着赤泥煅烧温度的升高，MPC水化热峰值逐渐升高，峰值出现时间提前；900℃煅烧赤泥的MPC膏体在28 d的抗压强度比纯MPC膏体提高了7.41 %。显微结构分析表明，900℃煅烧赤泥促进了主要水化产物鸟粪石的形成，同时也产生了源自辉长石的胶凝相。赤铁矿的微团聚效应和复合胶凝相的充填作用协同提高了体系的密度和界面强度。研究表明，高温煅烧赤泥作为一种高性能、低成本的复合材料，既有利于固体废物资源化利用，又有利于提高复合材料的性能。研究结果为红泥基胶凝材料的工程应用提供了理论支持。

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引用次数: 0

Combined elevated-rate and cyclic loading performance of strain-hardening cementitious composites 应变硬化胶凝复合材料的复合加速和循环加载性能

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

Construction and Building Materials

Pub Date : 2026-01-26 DOI: 10.1016/j.conbuildmat.2026.145385

Zixuan Tang , Chrysoula Litina , Vahid Afroughsabet , Christos Vlachakis , Abir Al-Tabbaa

Strain-hardening cementitious composites (SHCC), known for their advanced ductility and toughness, are promising for applications subjected to dynamic or cyclic loads. However, the combined effects of non-quasi-static loading rate and cyclic action—termed elevated-rate-cyclic loading—remain underexplored. These conditions are critical for simulating real-world forces such as seismic and traffic loads, where rate- and cycle-induced damage mechanisms interact and can significantly impact material performance. This study investigates two polyvinyl alcohol-SHCC mix designs, M45 and F28 (fly-ash-to-Portland-cement-ratio of 1.2 and 2.8 respectively), under elevated-rate-cyclic flexural loading. One-side cyclic and reversed cyclic regimes were applied across different loading rates to assess their effects on strength, ductility, stiffness, and toughness. The effect of mix design on SHCC responses is analysed through micromechanical models with microscopic observation of failure patterns. Results show that elevated-rate-cyclic loading caused greater reduction in SHCC ductility compared with cyclic or high-rate loading alone (by 45 % for M45 and 36 % for F28 versus quasi-static monotonic loading), due to accelerated fibre-matrix interface degradation and increased fibre rupture. F28, with lower matrix and interfacial bonding strength relative to fibre strength, exhibited better rate-cyclic endurance than M45 in sustaining strength, ductility and toughness. Material design insights are thereby provided for mitigating negative elevated-rate-cyclic effects and enhancing SHCC resilience.

应变硬化胶凝复合材料（SHCC）以其先进的延展性和韧性而闻名，在动态或循环载荷下的应用前景广阔。然而，非准静态加载速率和循环作用（即高速率循环加载）的联合效应仍未得到充分研究。这些条件对于模拟真实世界的作用力至关重要，例如地震和交通载荷，其中速率和循环引起的损伤机制相互作用，并可能显著影响材料的性能。本研究研究了两种聚乙烯醇- shcc混合料设计M45和F28（粉煤灰-波特兰-水泥比分别为1.2和2.8）在高速率循环弯曲荷载下的性能。单侧循环和反向循环制度适用于不同的加载率，以评估其对强度，延展性，刚度和韧性的影响。通过细观破坏模式的细观力学模型，分析了配合比设计对SHCC响应的影响。结果表明，与循环或高速率加载相比，高速率循环加载导致SHCC延性的更大降低（与准静态单调加载相比，M45和F28的降低幅度分别为45% %和36% %），这是由于纤维基质界面降解加速和纤维断裂增加。相对于纤维强度，F28的基体和界面结合强度较低，但在持续强度、延展性和韧性方面比M45表现出更好的循环速率耐久性。材料设计的见解，从而提供减轻负的高速率循环效应和增强SHCC弹性。

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引用次数: 0

Solar-reflective asphalt thin layer with TiO2 and glass beads: A sustainable solution for permafrost protection and pavement performance enhancement in cold-regions 具有TiO2和玻璃微珠的太阳反射沥青薄层：一种可持续的解决方案，用于保护寒冷地区的永久冻土和提高路面性能

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

Construction and Building Materials

Pub Date : 2026-01-26 DOI: 10.1016/j.conbuildmat.2026.145397

Zicheng Deng , Jiangmiao Yu , Kaide Fan , Yuan Zhang , Yong Deng

In cold regions, intense solar radiation on asphalt pavements induces thermal degradation and permafrost thaw settlement, causing cracking and uneven subsidence that compromise pavement serviceability and lifespan. Conventional heat-reflective coatings can reduce heat absorption but suffer from poor skid and fracture resistance, as well as limited durability due to texture loss and interfacial delamination, which ultimately diminishes their long-term cooling performance. To address these limitations, a novel heat-reflective asphalt thin layer was proposed using a clear asphalt binder with TiO₂ and glass beads incorporated via aggregate replacement. An innovative high-precision xenon lamp irradiation chamber was employed to conduct indoor tests, evaluating both surface and in-depth cooling performance. Pavement performance, including high-temperature stability, low-temperature cracking resistance, water stability, and skid resistance, was comprehensively assessed. Results showed that: (1) the optimal composition of 4 % TiO₂ and 1.5 % glass beads (T4G1.5) balanced cooling performance and cost, reducing surface temperatures by over 8 °C and bottom-layer temperatures by up to 5 °C; (2) T4G1.5 exhibited superior texture depth (1.1 mm) and British Pendulum Number (83) compared to conventional coatings; and (3) T4G1.5 achieved satisfactory high-temperature and water stability, along with enhanced −10 °C fracture properties relative to SBS-modified asphalt mixtures, increasing stress intensity factor by 66.7 %, fracture energy by 128.1 %, and cracking resistance index by 35.9 %. These findings demonstrate that the heat-reflective asphalt thin layer is a durable and practical solution for protecting permafrost while maintaining pavement performance in cold regions.

在寒冷地区，强烈的太阳辐射会导致沥青路面的热退化和永久冻土融化沉降，导致裂缝和不均匀沉降，从而影响路面的使用寿命。传统的热反射涂层可以减少吸热，但其防滑性和抗断裂性较差，并且由于纹理损失和界面分层，其耐久性有限，最终降低了其长期冷却性能。为了解决这些限制，研究人员提出了一种新型的热反射沥青薄层，该薄层使用透明沥青粘合剂，其中含有TiO2和通过骨料置换加入的玻璃微珠。采用创新的高精度氙灯照射室进行室内测试，评估表面和深层冷却性能。路面性能包括高温稳定性、低温抗裂性、水稳定性、防滑性等进行了综合评价。结果表明：(1)4 % TiO2和1.5 %玻璃微珠（T4G1.5）的最佳组合平衡了冷却性能和成本，使表面温度降低8°C以上，底层温度降低5°C；(2)与传统涂层相比，T4G1.5具有更好的织构深度（1.1 mm）和British Pendulum Number (83)；(3) T4G1.5具有良好的高温稳定性和水稳定性，与sbs改性沥青混合料相比，其- 10℃断裂性能增强，应力强度系数提高66.7 %，断裂能提高128.1 %，抗裂指数提高35.9 %。这些发现表明，热反射沥青薄层是一种持久和实用的解决方案，既可以保护冻土，又可以保持寒冷地区的路面性能。

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引用次数: 0

Effects of mixed strong-weak alkali activators on the performance and sustainability of one-part slag-fly ash mortars: A comprehensive evaluation 强弱碱混合活化剂对单组分渣粉煤灰砂浆性能和可持续性影响的综合评价

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

Construction and Building Materials

Pub Date : 2026-01-26 DOI: 10.1016/j.conbuildmat.2026.145406

Song Tian , Shuqi Ma , Xiangchen Yao , Haiming Chen , JiaZheng Chen , Xiang Xu

One-part alkali-activated materials face significant application barriers due to high drying shrinkage and the intense carbon footprint associated with traditional strong-alkali activators. To address these critical challenges, this study proposes a synergistic composite activation strategy utilizing a combination of strong and weak alkalis. A comprehensive evaluation was conducted to determine the effects of partially replacing sodium silicate with three weak alkalis, including Na₂CO₃, Na₂SO₄, and CaO, at dosages ranging from 20 % to 40 % in slag-fly ash mortars. The experimental results demonstrate that Na₂CO₃ exhibits the optimal synergistic effect among the tested groups. Specifically, a 30 % substitution level enhanced the 28-day compressive strength by 10.1 % while remarkably mitigating drying shrinkage by 39.5 %. Microstructural analysis via nanoindentation revealed that the sodium carbonate system promotes the formation of higher-density gel phases and a more homogeneous Interfacial Transition Zone. This improvement is primarily driven by the pore-filling effect of in-situ precipitated calcium carbonate crystals. Conversely, the sodium sulfate system induced micro-cracking due to localized ettringite expansion, while the calcium oxide system resulted in a loose microstructure caused by rapid reaction kinetics. Furthermore, Life Cycle Assessment confirmed that the composite activator systems significantly reduced the Global Warming Potential and Energy Demand Potential. These findings provide a theoretically supported route for developing dimensionally stable and low-carbon construction materials.

由于传统强碱活化剂的高干燥收缩率和强烈的碳足迹，单组分碱活化材料面临着重大的应用障碍。为了解决这些关键挑战，本研究提出了一种利用强碱和弱碱组合的协同复合活化策略。综合评价了用三种弱碱（Na2CO3、Na2SO4和CaO）部分替代水玻璃的效果，其用量为20 % ~ 40 %。实验结果表明，Na2CO3在被试基团之间表现出最佳的协同效应。具体来说，30 %的替代水平使28天的抗压强度提高了10.1 %，同时显著减轻了39.5 %的干燥收缩率。通过纳米压痕的微观结构分析表明，碳酸钠体系促进了高密度凝胶相的形成和更均匀的界面过渡区。这种改善主要是由原位沉淀碳酸钙晶体的孔隙填充效应驱动的。相反，硫酸钠体系由于钙矾石局部膨胀导致微开裂，而氧化钙体系由于反应动力学快速导致微观结构松散。此外，生命周期评估证实，复合活化剂系统显著降低了全球变暖潜势和能源需求潜势。这些发现为开发尺寸稳定、低碳的建筑材料提供了理论支持。

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