Construction and Building Materials最新文献_第2页

Thermally modified attapulgite as a green functional modifier for VOCs suppression in SBS modified asphalt composites 热改性凹凸棒土作为SBS改性沥青复合材料中抑制VOCs的绿色功能改性剂

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.2026.145901

Hao Lai , Anhua Xu , Jianliang Zhai , Weirong Guo , Youjie Zong , Haoyan Guo , Bowen Guan , Mingfeng Chang , Rui Xiong , Zhenjun Wang

During asphalt binder heating and paving, volatile organic compounds (VOCs) emissions unavoidably pose significant threats to human health and environment. This study investigated the feasibility of utilizing thermally modified attapulgite (TMA) as a green adsorption additive to mitigate VOCs emissions in SBS modified asphalt binder. TG experiments identified critical heat modification temperatures (110 °C, 250 °C, 520 °C, and 690 °C) for attapulgite (ATP) to regulate its physicochemical properties. Structural evolution and surface characteristics were systematically analyzed via XRD, FTIR, BET and Zeta potential techniques, while GC-MS was employed to evaluate VOCs emission behavior of ATP-SBS composite modified asphalt binder under heating conditions. Results show ATP modified at 520 °C (TMA520) achieved the highest VOCs reduction efficiency of 52.7%, attributed to retained surface structure and optimized pores. Furthermore, TMA520 significantly enhanced the high temperature performance of SBS modified asphalt binder. Although interaction with binder is physical, TMA520's high zeta potential ensures uniform dispersion and provides strong electrostatic adsorption for VOCs. Its hierarchical pore structure is crucial: macropores/mesopores capture and transport VOCs, while micropores immobilize them. This work demonstrates an effective approach for utilizing eco-functional minerals in binder, promoting cleaner pavement construction, particularly in ecologically sensitive regions.

在沥青粘结剂加热和铺装过程中，挥发性有机化合物（VOCs）的排放不可避免地对人类健康和环境造成重大威胁。本研究探讨了利用热改性凹凸棒土（TMA）作为绿色吸附添加剂减少SBS改性沥青粘结剂中VOCs排放的可行性。热重实验确定了凹凸棒石（ATP）的临界热改性温度（110°C, 250°C， 520°C和690°C）来调节其物理化学性质。通过XRD、FTIR、BET和Zeta电位等技术系统分析了ATP-SBS复合改性沥青粘结剂的结构演变和表面特征，并采用GC-MS评价了其在加热条件下的VOCs排放行为。结果表明，在520℃条件下，ATP （TMA520）由于保留了表面结构和优化了孔隙结构，达到了52.7%的最高VOCs还原效率。此外，TMA520显著提高了SBS改性沥青粘结剂的高温性能。虽然与粘合剂的相互作用是物理的，但TMA520的高zeta电位确保了均匀的分散，并为VOCs提供了强大的静电吸附。其分层孔隙结构至关重要：大孔/中孔捕获和运输挥发性有机化合物，而微孔则固定它们。这项工作证明了在粘合剂中利用生态功能矿物，促进清洁路面施工的有效方法，特别是在生态敏感地区。

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引用次数: 0

Study on mix design and properties of basalt fiber-reinforced concrete for bridge deck pavements in dry-cold regions with large temperature differences 干冷温差大地区桥面铺装用玄武岩纤维增强混凝土配合比设计及性能研究

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.2026.145919

Aiqin Shen, Yake Zhang , Penglong Fan, Yinchuan Guo

To improve the durability of bridge deck pavement concrete in dry-cold regions with large temperature differences, this study investigated the mix design and performance of basalt fiber-reinforced concrete (BFRC). Mortar tests combined with principal component analysis (PCA) were first conducted to optimize basalt fiber parameters, resulting in a diameter of 13–20 μm, a length of 6–18 mm, and a content of 0.06–0.10%. Subsequently, a four-factor, three-level orthogonal experimental design coupled with a combined weighting–grey relational analysis method was employed to determine the optimal mix proportion, consisting of 0.08% basalt fiber content, 10% fly ash replacement, 1.0% water reducer content, and a sand ratio of 38%. The optimized BFRC exhibited enhanced mechanical and durability performance. Compared with the reference concrete (RC), the 28-day compressive strength and flexural strength increased by 23.4% and 20.4%, respectively, while the mass loss rate after 300 freeze–thaw cycles and the chloride ion permeability decreased by 30.4% and 50.9%, respectively. Under large temperature fluctuation curing conditions, BFRC showed improved performance retention. SEM observations further revealed that basalt fibers restrained microcrack development through crack-bridging effects and reduced the connectivity of microcrack–pore networks after freeze–thaw exposure, providing microstructural support for the enhanced durability. These results offer theoretical insight and practical guidance for the design of durable bridge deck pavement concrete in dry-cold regions with large temperature differences.

为提高干冷温差较大地区桥面铺装混凝土的耐久性，对玄武岩纤维增强混凝土（BFRC）的配合比设计及性能进行了研究。首先通过砂浆试验结合主成分分析（PCA）对玄武岩纤维参数进行优化，得到直径13 ~ 20 μm，长度6 ~ 18 mm，含量0.06 ~ 0.10%的玄武岩纤维。随后，采用四因素三水平正交试验设计，结合加权-灰色关联分析方法确定了最佳配合比，即玄武岩纤维掺量0.08%，粉煤灰掺量10%，减水剂掺量1.0%，砂比38%。优化后的BFRC具有较好的力学性能和耐久性。与对照混凝土（RC）相比，28天抗压强度和抗弯强度分别提高了23.4%和20.4%，300次冻融循环后的质量损失率和氯离子渗透性分别降低了30.4%和50.9%。在温度波动较大的养护条件下，BFRC的性能保持性能有所提高。SEM观察进一步表明，玄武岩纤维通过裂缝桥接作用抑制了微裂纹的发展，降低了冻融暴露后微裂纹-孔网络的连通性，为增强耐久性提供了微观结构支撑。研究结果为大温差干寒地区桥面铺装混凝土耐久性设计提供了理论依据和实践指导。

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引用次数: 0

Effect of C2S and limestone powder contents on interfacial bond characteristics of high-strength steel fibers embedded in low-carbon mortars C2S和石灰石粉含量对低碳砂浆中高强钢纤维界面结合特性的影响

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.2026.145869

Van Thong Nguyen , Van Phi Dang , Hyeon Woo Noh , Dong Joo Kim

This study explores influence of dicalcium silicate (C₂S) and limestone powder (LP) contents on the interfacial bond characteristics of smooth and hooked steel fibers embedded in low-carbon mortars. Four mortar compositions with varying LP (0–30%) and C₂S (16.4–57.2%) contents were evaluated through single-fiber pullout, compressive tests, SEM–EDS, and nanoindentation (NI) analyses. A mixture containing 10% LP substitution in belite-rich cement (BRC) exhibited optimal performance and sustainability. Although increased C₂S content in BRC reduced early-age strength, it significantly enhanced the long-term mechanical and interfacial properties and improved the 90-day compressive strength, bond strength, and pullout energy by up to 65%. Higher LP levels yielded denser fiber–matrix interfacial zones (FMZs) and reduced porosity (25.0%→18.9%), while elevated C₂S promoted greater C-S-H formation (34.6%→51.5%). The optimized LP–BRC system demonstrated superior durability and interfacial performance with substantially lower CO₂ emissions, offering a viable and sustainable alternative to ordinary Portland cement (OPC).

本研究探讨了硅酸二钙（C2S）和石灰石粉（LP）含量对低碳砂浆中光滑和钩形钢纤维界面结合特性的影响。通过单纤维拉拔、压缩测试、SEM-EDS和纳米压痕（NI）分析，对四种不同LP（0-30%）和C2S（16.4-57.2%）含量的砂浆成分进行了评估。含10% LP替代的富白石水泥（BRC）表现出最佳的性能和可持续性。C2S含量的增加虽然降低了BRC的早期强度，但显著提高了BRC的长期力学性能和界面性能，并使BRC的90天抗压强度、粘结强度和拉拔能提高了65%。较高的LP水平产生更致密的纤维-基质界面带（FMZs）和降低的孔隙度（25.0%→18.9%），而升高的C2S促进了更多的C-S-H形成（34.6%→51.5%）。优化后的LP-BRC体系具有优异的耐久性和界面性能，二氧化碳排放量显著降低，是普通硅酸盐水泥（OPC）的可行和可持续替代品。

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引用次数: 0

Macro steel fiber effect on water permeability of concrete under coupled freeze-thaw cycles and compressive loading 宏观钢纤维对冻融循环和压缩耦合加载下混凝土透水性的影响

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.2026.145890

Wei Guo , Yining Ding , Fernando Pacheco-Torgal

The durability and damage mechanisms of concrete in cold regions are influenced by multiple coupled factors, including freeze-thaw (FT) cycles, mechanical loading, and moisture penetration. Water permeability directly plays a decisive role in durability, as water acts as the primary medium for aggressive agents to penetrate the matrix. This study investigates the water permeability of plain concrete (PC) and steel fiber reinforced concrete (SFRC) under compressive stress, both with and without exposure to FT cycles. The results show that the evolution of permeability with stress can be divided into three stages: a slight decrease, a slight increase, and a sharp increase. FT cycles substantially elevate permeability; for PC, the initial permeability rises from 2.99 × 10⁻¹¹ to 1.88 × 10⁻⁶ m/s, while the ultimate permeability increases 7.15 × 10⁻⁹ to 3.18 × 10⁻⁵ m/s after 100 FT cycles. Although steel fibers increase the initial permeability at 0 FT cycles (e.g., SFRC60 is 137% higher than PC), their beneficial effect becomes increasingly evident as the number of FT cycles increases. After 100 FT cycles, the initial and ultimate permeability of SFRC60 decrease by 71.6% and 97%, respectively, compared with those of PC. Moreover, under high stress levels (stress level > 0.65, where stress level is defined as the ratio of applied compressive stress to the peak compressive stress of each specimen), SFRC consistently exhibits lower permeability than PC, with the difference becoming more evident as the number of FT cycles increases. These findings demonstrate that steel fibers significantly enhance the frost resistance and overall durability of concrete under the combined actions of compressive stress and FT cycling.

寒区混凝土的耐久性和损伤机制受到冻融循环、机械载荷和水分渗透等多重耦合因素的影响。透水性直接对耐久性起决定性作用，因为水是侵蚀剂渗透基质的主要介质。本研究研究了素混凝土（PC）和钢纤维增强混凝土（SFRC）在压应力下的透水性，包括有和没有暴露于FT循环。结果表明：渗透率随应力的演化可分为微降、微增和急剧增大3个阶段；FT循环显著提高渗透率；PC的初始渗透率从2.99 × 10−11上升到1.88 × 10−6 m/s， 100 FT循环后的极限渗透率从7.15 × 10−9上升到3.18 × 10−5 m/s。虽然钢纤维在0 FT循环时增加了初始渗透率（例如，SFRC60比PC高137%），但随着FT循环次数的增加，其有益效果越来越明显。经过100次FT循环后，与PC相比，SFRC60的初始渗透率和极限渗透率分别下降了71.6%和97%。此外，在高应力水平下（应力水平>； 0.65，其中应力水平定义为每个试件的施加压应力与峰值压应力之比），SFRC的渗透率始终低于PC，并且随着FT循环次数的增加，这种差异变得更加明显。这些结果表明，在压应力和FT循环的共同作用下，钢纤维显著提高了混凝土的抗冻性和整体耐久性。

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引用次数: 0

Experimental analysis and finite element simulation of the flexural performance of glued laminated bamboo beam string structures 胶合竹梁串结构抗弯性能的实验分析与有限元模拟

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.2026.145854

Mingmin Ding , Zhenliang Hua , Yu Lin , Xiancai Zhong , Jiyang Yi , Yang Wei

To address the low flexural stiffness and limited deformation of glued laminated bamboo (GLB) beams, this study introduces the beam string structure (BSS) system, aiming to investigate the effects of strut configuration and rise height on their flexural performance. Static tests were conducted on eight full-scale specimens, which were explicitly categorized into two configurations: (a) Straight BSS, varying in strut number (single vs. double) and strut length (130 mm vs. 160 mm); and (b) Arched BSS, varying in rise height (50 mm, 100 mm, and 150 mm). Simultaneously, a numerical model incorporating tension-compression asymmetry and Extended Finite Element Method (XFEM) damage mechanisms was established, and theoretical formulas covering the entire loading process were derived. Results indicate that the BSS system significantly improved the mechanical performance of GLB beams. Among the straight configurations, the double long-strut type (TLSSB2S) exhibited optimal performance, with ultimate load capacity and energy dissipation increasing by 52.9% and 64.6%, respectively, compared to the pure beam. Conversely, for the simply supported arched configurations, both load capacity and stiffness showed a degradation trend as rise height increased. Numerical and theoretical predictions agreed well with experimental data, validating the effectiveness of this system for engineering applications.

针对竹材胶合梁抗弯刚度低、变形有限的问题，引入梁串结构（BSS）体系，研究竹材胶合梁的支撑结构形式和上升高度对其抗弯性能的影响。在8个全尺寸试件上进行了静力测试，这些试件明确分为两种配置：(a)直线型BSS，不同的支柱数量（单支柱vs双支柱）和支柱长度（130 mm vs 160 mm）；(b)拱形BSS，上升高度不同（50 mm、100 mm和150 mm）。同时，建立了考虑拉压不对称和扩展有限元法（XFEM）损伤机理的数值模型，推导了涵盖整个加载过程的理论公式。结果表明，BSS系统显著改善了GLB梁的受力性能。在直线型结构中，双长杆型（TLSSB2S）表现最佳，其极限承载能力和耗能分别比纯梁提高52.9%和64.6%。相反，对于简支拱结构，随着上升高度的增加，其承载能力和刚度均呈退化趋势。数值和理论预测与实验数据吻合良好，验证了该系统在工程应用中的有效性。

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引用次数: 0

Precision-tailored waterjet-cut composite fibers for ultra-high-performance concrete: Fabrication process and mechanical performance 用于高性能混凝土的精密定制水射流切割复合纤维：制造工艺和机械性能

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.2026.145856

Yanran Meng, Yu Xiang, Tao Yu

Ultra-high-performance concrete (UHPC) relies critically on discrete fibers to achieve its exceptional mechanical properties. The use of corrosion-resistant fibers may become essential when the concrete is exposed to harsh environment (e.g., marine environment), or when it incorporates seawater and/or sea-sand. This study develops a novel type of fiber-reinforced polymer (FRP) composite-based macro fibers (referred to as composite fibers), fabricated using computer numerical control (CNC) machining, specifically, a waterjet cutting process. This method enables precise customization of fiber properties, including their shape and dimensions. A series of tests were conducted to evaluate the performance of the composite fibers in four different configurations, namely, straight fibers, hooked-end fibers, and corrugated fibers with two distinct wave heights. The results revealed that the bond strength of the composite fibers significantly exceeded that of corresponding straight steel fibers and polypropylene (PP) fibers. The corrugated composite fibers exhibited higher bond stiffness than their straight counterparts, attributed to enhanced mechanical interlocking with the concrete matrix; however, premature rupture initiated at bent/turning regions, which may limit peak bond mobilization. Furthermore, the tensile and compressive strengths of ultra-high-performance seawater sea-sand concrete (UHPSSC) reinforced with the composite fibers were significantly higher than that with PP fibers. These findings highlight the potential of precision-tailored, corrosion-free composite fibers as a practical reinforcement option for UHPC/UHPSSC applications in corrosion-prone environments. Future work should optimize the corrugated composite fiber laminate/geometry to mitigate turning-region rupture and fully exploit the bond benefits.

超高性能混凝土（UHPC）主要依赖于离散纤维来实现其卓越的机械性能。当混凝土暴露在恶劣环境（例如海洋环境）中，或者混凝土中含有海水和/或海砂时，使用耐腐蚀纤维可能变得必不可少。本研究开发了一种新型的纤维增强聚合物（FRP）复合基宏观纤维（简称复合纤维），采用计算机数控（CNC）加工，特别是水射流切割工艺制造。这种方法可以精确定制纤维的特性，包括它们的形状和尺寸。在不同波高的情况下，采用直纤维、钩端纤维和波纹纤维四种不同结构对复合纤维进行了性能测试。结果表明，复合纤维的结合强度明显超过相应的直钢纤维和聚丙烯纤维。由于与混凝土基体的机械互锁增强，波纹复合纤维比直纤维具有更高的粘结刚度；然而，在弯曲/转向区域开始过早断裂，可能限制峰值键动员。复合纤维增强的超高性能海水海砂混凝土（UHPSSC）的抗拉和抗压强度显著高于PP纤维增强的UHPSSC。这些发现凸显了精密定制、无腐蚀复合纤维作为易腐蚀环境中UHPC/UHPSSC应用的实用增强选择的潜力。未来的工作应优化波纹复合纤维层压/几何结构，以减轻扭转区断裂，并充分发挥粘合效益。

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引用次数: 0

Mechanical and gamma-ray shielding performance of waste ceramic substituted magnetite concrete under high temperatures 废陶瓷代替磁铁矿混凝土高温下的力学和γ射线屏蔽性能

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.2026.145799

Kai Ji , Zhenfu Chen , Qiuwang Tao , Qiongfang Wu , Dan Wu , Minghui Wang

To synergistically enhance radiation shielding performance while promoting resource sustainability, this study developed a high-density radiation-shielding concrete by substituting magnetite fine aggregate with waste ceramic fine aggregate at volumetric replacement ratios of 0%, 20%, 40%, 60%, 80%, and 100%. The thermal response (25 ℃, 300 ℃, 450 ℃, 600 ℃) was systematically evaluated in terms of mass loss ratio, ultrasonic pulse velocity（UPV）, macro-mechanical properties, microstructural evolution, and gamma-ray linear attenuation coefficient (μ) characteristics. Multi-scale mechanisms were elucidated via scanning electron microscopy (SEM) and X-ray diffraction (XRD). Results demonstrate that moderate ceramic incorporation optimizes internal humidity distribution and reinforces the interfacial transition zone (ITZ). The 60% replacement mixture exhibited optimal comprehensive performance within 300–450 ℃, with significantly higher compressive strength, splitting tensile strength, and UPV than the control (0% replacement), indicating superior thermo-mechanical stability. Even under extreme 600 ℃ exposure, although compressive strength slightly decreased, splitting tensile strength remained higher than that of the control. SEM analysis revealed reduced ITZ porosity and enhanced densification in the 60% mixture; at 300 ℃, secondary hydration, triggered by internal curing, generated C-S-H gel that effectively filled and “healed” thermally induced microcracks. Gamma-ray shielding performance was evaluated using the μ and the mass attenuation coefficient (μₘ). At different temperatures, as the replacement ratio increased, μ showed a decreasing trend, whereas μₘ showed an increasing trend. In conclusion, the 60% waste ceramic replacement ratio achieves synergistic optimization among load-bearing capacity, thermal-damage tolerance, and radiation-shielding efficiency, offering a green functional material with environmental compatibility and high-temperature service reliability for nuclear facilities, civil defense projects, and medical radiation shielding structures.

为了协同提高辐射屏蔽性能，同时促进资源可持续性，本研究以废陶瓷细骨料代替磁铁矿细骨料，按体积替代率分别为0%、20%、40%、60%、80%和100%，研制了高密度辐射屏蔽混凝土。从质量损失率、超声脉冲速度（UPV）、宏观力学性能、微观组织演化和γ射线线性衰减系数（μ）特征等方面对热响应（25℃、300℃、450℃、600℃）进行了系统评价。通过扫描电镜（SEM）和x射线衍射（XRD）分析了多尺度机理。结果表明，适量的陶瓷掺入优化了内部湿度分布，强化了界面过渡区（ITZ）。在300 ~ 450℃范围内，60%置换后的混合料综合性能最佳，抗压强度、劈裂抗拉强度和UPV均显著高于0%置换后的混合料，表现出优异的热机械稳定性。即使在600℃极端暴露下，抗压强度略有下降，但劈裂抗拉强度仍高于对照。SEM分析表明，在60%的混合物中，ITZ孔隙率降低，致密化增强；在300℃下，内部固化引发二次水化，生成C-S-H凝胶，有效填充和“愈合”热致微裂缝。用μ和质量衰减系数（μ￣）评价了屏蔽γ射线的性能。在不同温度下，随着替代率的增加，μ呈减小趋势，而μ _ _ _呈增大趋势。综上所述，60%的废陶瓷替代率实现了承载能力、热损伤容差和辐射屏蔽效率的协同优化，为核设施、民防工程、医疗辐射屏蔽结构提供了一种具有环境相容性和高温服务可靠性的绿色功能材料。

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引用次数: 0

Comparative assessment of natural and salt-modified travertines for gamma-ray protection in construction materials 天然和盐改性石灰华在建筑材料中伽马射线防护的比较评价

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.2026.145909

A.V. Korkmaz , M. Sert , E. Kemah , H. Yakut

In this study, the gamma-ray shielding performance of natural and salt-modified travertine stones is experimentally investigated over the photon energy range of 0.511–1.332 MeV using a 3″× 3″ NaI (Tl) detector system and standard point gamma-ray sources (²²Na, ¹³⁷Cs, ⁶⁰Co). Salt modification is achieved through a controlled salt crystallization process designed to simulate the long-term salt-exposure effects commonly observed in building stones. The linear and mass attenuation coefficients are determined, and key radiation shielding parameters, including half-value layer (HVL), tenth-value layer (TVL), mean free path (MFP), radiation protection efficiency (RPE), and effective atomic number, are evaluated. Theoretical calculations are also computed using the Phy-X software for comparison. The results indicate that salt crystallization results in only minor variations in gamma-ray attenuation properties of travertines, with natural and salt-modified samples exhibiting comparable shielding performance across the investigated energy range. Over the investigated energy range (0.511–1.332 MeV), the studied travertines exhibit MAC values of 0.094–0.055 cm²/g, comparable to those of natural rocks with similar density, highlighting their potential as alternative photon-shielding materials. The evaluation revealed that the highest attenuation coefficients were achieved by the PT-C sample, with MAC and LAC values of 0.1082 cm²/g and 0.2906 cm⁻¹ at 0.511 MeV, respectively. Consequently, the lowest transmission parameters were also recorded for this sample, showing an HVL of 2.385 cm and an MFP of 3.441 cm at the same energy. Owing to their natural origin, durability, and low-energy processing requirements, travertine stones may offer sustainability advantages as secondary or auxiliary gamma-ray shielding materials in architectural and construction applications.

在本研究中，使用3″× 3″NaI （Tl）探测器系统和标准点伽马射线源（²²Na，¹³⁷Cs, 26⁰Co），实验研究了天然和盐改性钙华石在0.511-1.332 MeV光子能量范围内的伽马射线屏蔽性能。盐改性是通过控制盐结晶过程来实现的，该过程旨在模拟建筑石材中常见的长期盐暴露效应。确定了线性衰减系数和质量衰减系数，评估了半值层（HVL）、十值层（TVL）、平均自由程（MFP）、辐射防护效率（RPE）和有效原子序数等关键辐射屏蔽参数。理论计算也使用Phy-X软件进行比较。结果表明，盐结晶对石灰华的伽马射线衰减特性的影响很小，在所研究的能量范围内，天然样品和盐改性样品的屏蔽性能相当。在所研究的能量范围内（0.511-1.332 MeV），所研究的石灰华的MAC值为0.094-0.055 cm²/g，与相似密度的天然岩石相当，突出了它们作为替代光子屏蔽材料的潜力。结果表明，PT-C样品的衰减系数最高，在0.511 MeV下，其MAC和LAC值分别为0.1082 cm²/g和0.2906 cm⁻¹ 。因此，该样品也记录了最低的透射参数，在相同能量下，HVL为2.385 cm， MFP为3.441 cm。由于其天然来源，耐用性和低能耗加工要求，石灰华石可以作为建筑和建筑应用中的次要或辅助伽马射线屏蔽材料提供可持续性优势。

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引用次数: 0

Synergistic surface modification for high-strength Al/PA6 joints: Failure mechanisms unveiled by in-situ SEM push-out shear testing 高强度Al/PA6接头的协同表面改性：原位SEM推出剪切试验揭示的破坏机制

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.2026.145862

Lingpei Kong , Tianye Yang , Shubin Liu , Shunbo Wang , Yuhang Wu , Hang Zhu

Polymer-metal hybrid structures are increasingly utilized in modern construction and engineering applications due to their superior lightweight properties and structural efficiency. However, achieving reliable interfacial bonding between chemically dissimilar thermoplastics and metals remains a critical challenge for the structural integrity of these injection-molded components. This paper proposes a synergistic surface modification strategy combining alkaline etching, hot water treatment, and plasma activation (AHP) to construct hierarchical micro/nano structures on 6061-T6 aluminum alloy surfaces to enhance interfacial activity. This strategy significantly improves the bonding strength of the injection-molded joint between 6061-T6 aluminum alloy and 30 wt% glass fiber reinforced polyamide 6 (GF30%-PA6). This paper uses in-situ scanning electron microscopy and shear test methods to visualize the failure evolution process of dynamic interfaces. Results indicate that the shear strength of the AHP-modified joint surges to 34.82 MPa. In-situ SEM observations confirm that damage preferentially initiates from micro-defects within the GF30%-PA6 matrix adjacent to the interface. The failure trajectory subsequently bifurcates into either interfacial debonding (adhesive failure) or matrix-dominated cracking (cohesive failure). This bifurcation is rationalized by correlating DIC-derived strain localization/dissipation indicators with the macroscopic interfacial fracture energy

G_{c}

obtained from the global load–displacement response. These findings provide direct experimental evidence and mechanistic guidance for optimizing high-load-bearing polymer–metal hybrid joints used in structural applications.

聚合物-金属混合结构由于其优异的轻质性能和结构效率，在现代建筑和工程应用中得到越来越多的应用。然而，在化学性质不同的热塑性塑料和金属之间实现可靠的界面粘合仍然是这些注塑成型部件结构完整性的关键挑战。本文提出了一种结合碱性蚀刻、热水处理和等离子体活化（AHP）的协同表面改性策略，在6061-T6铝合金表面构建层次化微纳结构，以增强界面活性。该策略显著提高了6061-T6铝合金与30 wt%玻璃纤维增强聚酰胺6 （GF30%-PA6）的注塑接头的结合强度。采用原位扫描电镜和剪切试验等方法对动态界面的破坏演化过程进行了可视化分析。结果表明：ahp改性节理抗剪强度达到34.82 MPa；原位SEM观察证实，损伤优先从靠近界面的GF30%-PA6基体内的微缺陷开始。破坏轨迹随后分为界面脱粘（粘结破坏）或基质主导开裂（内聚破坏）。通过将dic导出的应变局部化/耗散指标与从全局载荷-位移响应中获得的宏观界面断裂能Gc相关联，可以使这种分岔合理化。这些发现为结构应用中高承载聚合物-金属混合接头的优化提供了直接的实验依据和机理指导。

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引用次数: 0

Study on autogenous shrinkage of carbon nanotubes modified rockfill dam face slab concrete at early age under different temperature 不同温度下碳纳米管改性堆石坝面板混凝土早期自收缩特性研究

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

Construction and Building Materials

Pub Date : 2026-04-11 Epub Date: 2026-03-09 DOI: 10.1016/j.conbuildmat.2026.145797

Zhifang Zhao , Zhuojun Hu , Yanxia Liu , Chengzhuo Xie , Yanming Liu , Zhigang Zhao , Yubing Ouyang , Tao Shi

Autogenous shrinkage is one of the important factors affecting early-age cracking of concrete face slabs in rockfill dams. Carbon nanotubes (CNTs) possess excellent potential to enhance the performance of face slab concrete. The autogenous shrinkage behavior of CNTs-modified face slab concrete urgently requires investigation. Currently, studies on the effect of temperature on autogenous shrinkage often focus on a single temperature condition. To address this limitation, this study investigates the effects of different curing temperatures (20°C, 30°C, and 40°C) and CNT dosages (0%, 0.03%, 0.06%, 0.10%, and 0.15%) using cement paste. The results showed that an increase in curing temperature significantly accelerates the early-age autogenous shrinkage rate, particularly within the first 24 h, and also intensifies the ultimate shrinkage magnitude. Similarly, a higher CNT content was found to enhance both the development speed and the final value of early-age autogenous shrinkage. Furthermore, a multiscale model for early-age autogenous shrinkage of cement paste was established by integrating continuum micromechanics with capillary pressure theory, which provided good agreement with the experimental data. The results showed that chemical shrinkage in the unsaturated humidity stage is driven by capillary pressure. Moreover, the model indicates that chemical shrinkage accounts for the majority of autogenous shrinkage, approximately over 70% of the total. It also reveals that the effects of temperature and CNTs on autogenous shrinkage primarily manifest through accelerated early-age cement hydration, increased chemical shrinkage during the humidity-saturated phase, and the prolonged duration of this phase.

自收缩是影响堆石坝混凝土面板早期开裂的重要因素之一。碳纳米管（Carbon nanotubes, CNTs）在提高面板混凝土性能方面具有良好的潜力。碳纳米管改性面板混凝土的自收缩性能迫切需要研究。目前，关于温度对自收缩影响的研究往往集中在单一温度条件下。为了解决这一限制，本研究考察了不同养护温度（20°C、30°C和40°C）和碳纳米管用量（0%、0.03%、0.06%、0.10%和0.15%）对水泥浆的影响。结果表明：养护温度的升高显著加快了早期自收缩率，特别是在前24 h内，并加剧了极限收缩幅度；同样，碳纳米管含量越高，早期自收缩的发展速度越快，最终的自收缩值越高。将连续介质细观力学与毛细压力理论相结合，建立了水泥浆体早期自收缩的多尺度模型，该模型与试验数据吻合较好。结果表明，非饱和湿度阶段的化学收缩是由毛细压力驱动的。此外，该模型还表明，化学收缩占自收缩的大部分，约占总收缩的70%以上。研究还表明，温度和CNTs对自收缩的影响主要表现在早期水泥水化加速、湿饱和阶段化学收缩增加以及该阶段持续时间延长。

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引用次数: 0