Construction and Building Materials最新文献_第10页

Electromagnetic self-curing of reinforced concrete: Coupled heat-transfer and interfacial bonding mechanisms revealed through experiments and multiphysics simulation 钢筋混凝土电磁自养护：通过实验和多物理场模拟揭示的耦合传热和界面结合机制

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

Construction and Building Materials

Pub Date : 2026-01-23 DOI: 10.1016/j.conbuildmat.2026.145239

Ling Wang , Wuqie Muchu , Xiaohui Liu , Shiyong Mi , Moncef L. Nehdi , Junfei Zhang , Lei Zhang

Electromagnetic self-curing is an emerging internal heating technology that uses the electrical conductivity and magnetic susceptibility of steel reinforcement to generate heat, enabling uniform and efficient curing of concrete. This study presents a novel electromagnetic self-curing (ESC) strategy designed to address the challenge of insufficient early-age bond performance at the steel–concrete interface during winter construction. Controlled pull-out tests, microstructural characterization, and Multiphysics simulations with COMSOL were conducted to clarify the coupled heat transfer and interfacial bonding mechanisms under target temperatures of 40 °C, 50 °C, and 60 °C and a range of curing ages. The results show that ESC substantially increases the internal temperature of concrete and reduces thermal gradients, with a target temperature of 50 °C providing the highest heating efficiency and bond strength improvement. Under these conditions, one-day bond strength increased from approximately 2 MPa in standard curing to about 16 MPa. Microstructural analyses revealed that moderate temperatures accelerate hydration, produce denser interfacial transition zones, and improve pore structure, while excessive heating at 60 °C can lead to structural inhomogeneity. The combined experimental and numerical approach demonstrates that ESC is a low-energy and high-efficiency method for improving the early-age performance of reinforced concrete in cold climates, offering both theoretical and practical foundations for broader engineering application.

电磁自固化是一种新兴的内部加热技术，它利用钢筋的导电性和磁化率产生热量，使混凝土均匀有效地固化。本研究提出了一种新的电磁自养护（ESC）策略，旨在解决冬季施工期间钢-混凝土界面早期粘结性能不足的挑战。通过控制拔出试验、微观结构表征和COMSOL多物理场模拟，阐明了在目标温度为40°C、50°C和60°C以及一系列固化时间下的耦合传热和界面键合机制。结果表明，ESC显著提高了混凝土内部温度，减小了热梯度，目标温度为50℃时，加热效率最高，粘结强度提高最大。在这些条件下，一天的粘结强度从标准养护时的约2 MPa增加到约16 MPa。微观结构分析表明，中等温度加速了水化作用，产生了更致密的界面过渡区，改善了孔隙结构，而60℃的过度加热会导致结构不均匀性。试验与数值相结合的方法表明，ESC是一种低能耗、高效率的改善寒冷气候条件下钢筋混凝土早期性能的方法，为更广泛的工程应用提供了理论和实践基础。

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引用次数: 0

Silica-mineralized densified wood prepared from sodium silicate and modified with aminotrimethylene phosphonic acid to impart smoke suppression and water resistance 以硅酸钠为原料，经氨基三亚甲基膦酸改性后制成的硅矿化致密木材，具有抑烟和耐水性

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

Construction and Building Materials

Pub Date : 2026-01-23 DOI: 10.1016/j.conbuildmat.2026.145388

Xinru Cui , Saiyu Ren , Yuhui Zhang , Jianmin He , Yingcheng Hu

Wood, as a lightweight and high-strength sustainable material, but its inherent flammability and hygroscopicity limit its construction applications. Although densification significantly enhances its mechanical properties, its exposed hydrophilic groups lead to moisture absorption, swelling, and the generation of denser, more continuous smoke during combustion. To address these challenges, an eco-friendly modification strategy was developed by assisting the in-situ mineralization of sodium silicate within densified wood using aminotrimethylene phosphonic acid (ATMP). The resulting mineralized silicate network improved the fire and water resistance of the original material. The fire performance was assessed using cone calorimetry, and the water stability was evaluated using water absorption and thickness expansion tests. Compared with densified wood, its mineralized counterpart exhibited a 42.83 % lower peak heat release rate (pHRR), a 62.73 % lower peak smoke release rate (pSPR), a 57.84 % lower total smoke production (TSP), and a 77.11 % lower thickness expansion rate. ATMP-assisted silicate mineralization provides a low-toxicity and sustainable approach for producing fire-safe and dimensionally stable densified wood, which may expand its potential applications for green building projects.

木材作为一种轻质、高强度的可持续材料，其固有的可燃性和吸湿性限制了其建筑应用。虽然致密化显著提高了其机械性能，但其暴露的亲水基团会导致吸湿、膨胀，并在燃烧过程中产生更密集、更连续的烟雾。为了应对这些挑战，研究人员开发了一种环保的改性策略，即使用氨基三亚甲基膦酸（ATMP）协助致密木材中硅酸钠的原位矿化。由此产生的矿化硅酸盐网络提高了原始材料的耐火性和耐水性。防火性能采用锥形量热法评估，水稳定性采用吸水率和厚度膨胀试验评估。与致密化木材相比，矿化木材的峰值放热率（pHRR）降低42.83 %，峰值放烟率（pSPR）降低62.73 %，总发烟率（TSP）降低57.84 %，厚度膨胀率降低77.11 %。atmp辅助硅酸盐矿化为生产防火安全、尺寸稳定的致密木材提供了一种低毒性和可持续的方法，这可能扩大其在绿色建筑项目中的潜在应用。

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引用次数: 0

Mechanical characterization of solid waste-based soilcrete and its influence on pile-soilcrete interface behavior 固体废物基混凝土力学特性及其对桩-土界面特性的影响

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

Construction and Building Materials

Pub Date : 2026-01-23 DOI: 10.1016/j.conbuildmat.2026.145355

Yuantian Sun , Zeyu Shao , Guichen Li , Wenjin Tao , Feiyu Zhang , Zhenqian Ma , Shang Wang , Guangteng Qin , Rihong Zhang

The increasing demand for sustainable and high-performance foundation materials has prompted the use of industrial solid wastes as substitutes for conventional cement in soil stabilization. This study investigates the mechanical behavior of solid waste-based soilcrete and its influence on the pile-soilcrete interface performance in static drilled root pile (SDRP) systems. A series of laboratory tests, including uniaxial compressive, direct shear and annular soilcrete-pile interface shear tests were conducted on soilcretes prepared with blended stabilizers of cement, mineral powder, fly ash and gypsum. The result showed that an appropriate combination of mineral powder and fly ash remarkably enhanced both uniaxial compressive strength (UCS) and elastic modulus of soilcrete. The optimal stabilizer mixture including 40 % cement, 54 % mineral powder, 6 % fly ash and 5 % gypsum achieved a 28-day UCS of 1.68 MPa and elastic modulus of 110 MPa, twice that of pure cement soilcrete. Direct shear tests illustrated that cohesion of optimal solid waste-based soilcrete can significantly increase, reaching more than twice of that within the control group, while the friction angle remained within 22.5°–34° without a clear trend. A transition of soilcrete from shear hardening to softening with curing age was revealed. Annular interface shear tests demonstrated a logarithmic increase in the peak skin friction with an increase in soilcrete UCS, while the residual resistance decreased as brittleness developed indicating the evolution from friction-dominated to bond-dominated failure. Failure occurred primarily along the soilcrete-pile interface. The microstructure of soilcrete at different curing days was revealed and its relationship with mechanical properties was explained.

对可持续和高性能基础材料的需求日益增长，促使工业固体废物作为传统水泥在土壤稳定中的替代品。研究了固体废物基混凝土的力学特性及其对静力钻孔根桩（SDRP）体系中桩-土界面性能的影响。对水泥、矿粉、粉煤灰、石膏等混合稳定剂配制的土基进行了单轴压缩、直剪、环空土桩界面剪切等室内试验。结果表明，矿粉与粉煤灰的合理配合能显著提高混凝土的单轴抗压强度和弹性模量。最佳稳定剂配比为40 %水泥、54 %矿粉、6 %粉煤灰和5 %石膏，其28天单抗强度为1.68 MPa，弹性模量为110 MPa，是纯水泥混凝土的2倍。直剪试验结果表明，最优固废基混凝土的黏聚力显著提高，达到对照组的2倍以上，而摩擦角保持在22.5°~ 34°范围内，无明显趋势。随着养护龄期的延长，混凝土由剪切硬化向软化转变。环空界面剪切试验表明，随着混凝土单抗强度的增加，峰值表皮摩擦力呈对数增长，而残余阻力随着脆性的发展而下降，表明由摩擦主导破坏向粘结主导破坏演变。破坏主要发生在土桩界面。揭示了不同养护天数下混凝土的微观结构及其与力学性能的关系。

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引用次数: 0

Study on gradation optimization of manufactured sand concrete based on correlation analysis between acoustic characteristics and pore structure 基于声学特性与孔隙结构相关性分析的制砂混凝土级配优化研究

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

Construction and Building Materials

Pub Date : 2026-01-23 DOI: 10.1016/j.conbuildmat.2026.145369

Peiyan Li , Yubo Jiao , Heping Liu , Junyan Yu , Qifan Wu

Optimizing aggregate gradation is essential to overcome the morphological limitations of manufactured sand (MS) and enhance concrete performance. However, a systematic comparison of classical packing models for MS is lacking, and the linkage between particle packing, real-time damage evolution, and pore structure remains unclear. This study addresses these gaps by designing MS concrete using single particle sizes and three classical packing theories: the Fuller curve, Andreasen model, and Dinger–Funk model. A multi-scale experimental approach was employed, integrating compressive strength testing with ultrasonic detection, Acoustic emission (AE) monitoring, and Mercury Intrusion Porosimetry (MIP). The results demonstrate that the Fuller curve (m=0.30) and Dinger–Funk model (q=0.30) achieved the highest packing efficiency, yielding compressive strengths 18.6 % and 13.1 % higher than the Andreasen model (q=0.41), respectively. Ultrasonic testing confirmed a significant correlation (r = 0.890) between longitudinal wave velocity and compressive strength, validating P-wave velocity as a reliable predictor of compactness. Regarding damage evolution, AE analysis revealed that optimized gradation suppressed early-stage energy release and maintained a stable high b-value, effectively delaying the transition from micro-cracking to macroscopic failure. Quantitative analysis further established that cumulative AE energy follows an exponential decay relationship with both compressive strength (R²=0.988) and P-wave velocity (R²=0.979), serving as a sensitive damage indicator. Microstructurally, MIP verified that rational gradation reduced total porosity and refined the pore network by converting highly harmful pores (>200 nm) into harmless micropores. By correlating macroscopic mechanics, mesoscopic damage evolution, and microscopic pore characteristics, this work provides a rigorous theoretical basis for the precision design of high-performance MS concrete.

优化骨料级配对于克服制砂的形态限制和提高混凝土性能至关重要。然而，缺乏对MS经典堆积模型的系统比较，颗粒堆积、实时损伤演化和孔隙结构之间的联系尚不清楚。本研究通过使用单一粒径和三种经典填充理论（Fuller曲线、Andreasen模型和Dinger-Funk模型）设计MS混凝土来解决这些差距。采用多尺度实验方法，将抗压强度测试与超声检测、声发射（AE）监测、压汞孔隙度测定（MIP）相结合。结果表明，Fuller曲线（m=0.30）和Dinger-Funk模型（q=0.30）的充填效率最高，屈服抗压强度分别比Andreasen模型（q=0.41）高18.6 %和13.1 %。超声检测证实纵波速度与抗压强度之间存在显著相关性（r = 0.890），验证纵波速度是密实度的可靠预测指标。在损伤演化方面，声发射分析表明，优化后的级配抑制了早期的能量释放，保持了稳定的高b值，有效延缓了从微观开裂到宏观破坏的转变。定量分析进一步证实，累积声发射能量与抗压强度（R2=0.988）和纵波速度（R2=0.979）均呈指数衰减关系，是一个敏感的损伤指标。微观结构上，MIP验证了合理的级配将高度有害的孔隙（>200 nm）转化为无害的微孔，从而降低了总孔隙度，细化了孔隙网络。通过将宏观力学、细观损伤演化和微观孔隙特征相关联，为高性能MS混凝土的精密设计提供了严谨的理论依据。

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引用次数: 0

Basic factors influencing the thermal and strength properties of lightweight concretes gelled with starch 影响淀粉胶凝轻量混凝土热强度性能的基本因素

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

Construction and Building Materials

Pub Date : 2026-01-23 DOI: 10.1016/j.conbuildmat.2026.145386

Jarosław Strzałkowski, Agata Stolarska

The article presents a comprehensive analysis of the influence of technological parameters on the properties of lightweight concrete gelled with starch, with particular emphasis on microstructure, porosity, and mechanical and thermal characteristics. The study examined composites with varied starch content, sodium metasilicate dosage, gelation temperature, and hydrated lime addition. Key properties were evaluated through a range of tests: fresh mix consistency, stability of mixtures in the initial curing phase, bulk density, compressive and flexural strength, thermal characteristics, microstructure analysis (SEM), pore size distribution (mercury intrusion porosimetry), and moisture sorption isotherms (DVS). The resulting materials featured high porosity (approximately 60–80 %), density of 560–650 kg/m³ , thermal conductivity of 0.077–0.096 W/mK, compressive strength of 2.0–3.5 MPa, and flexural strength of 0.5–1.2 MPa. Starch gelation technology offers a promising solution for producing lightweight materials with optimized insulation and structural performance.

本文全面分析了工艺参数对淀粉胶凝轻量混凝土性能的影响，特别强调了微观结构、孔隙率、力学和热特性。该研究考察了不同淀粉含量、偏硅酸钠用量、凝胶温度和水合石灰添加量的复合材料。通过一系列测试来评估关键性能：新鲜混合物的稠度、混合物在初始固化阶段的稳定性、体积密度、抗压和抗折强度、热特性、微观结构分析（SEM）、孔径分布（压汞孔隙法）和吸湿等温线（DVS）。所得材料孔隙率高（约60-80 %），密度560-650 kg/m³ ，导热系数0.077-0.096 W/mK，抗压强度2.0-3.5 MPa，抗弯强度0.5-1.2 MPa。淀粉凝胶技术为生产具有优化绝缘和结构性能的轻质材料提供了一个有前途的解决方案。

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引用次数: 0

The stress-strain constitutive relationship of recycled stone masonry aggregate concrete in channel engineering 河道工程中再生石砌体骨料混凝土的应力-应变本构关系

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

Construction and Building Materials

Pub Date : 2026-01-23 DOI: 10.1016/j.conbuildmat.2026.145367

Jianguo Chen , Ziyue Chen , Zhuojie Huang , Weiyao Liang , Chengqi Chen , Jianzhuang Xiao , Haiyan He , Huajie Huang

Hydraulic stone masonry subjected to prolonged environmental influences (such as weathering and hydraulic erosion) commonly develop internal microcracks and laminated weathered rock, posing potential risks to the performance of concrete produced from their recycled material. Hence, this study systematically investigates the fundamental properties of recycled stone masonry aggregate concrete (RSMAC) produced by substituting natural coarse aggregates with recycled stone masonry aggregate (RSMA), which focuses on its mechanical performance, stress-strain relationship, and microstructural analysis through a case study involving a channel reconstruction project. The results indicate that as the replacement rate of RSMA increases, both the compressive strength and splitting tensile strength of the concrete exhibit a decreasing trend. Compared with natural aggregate concrete, the 28 d compressive strength and splitting tensile strength of RSMAC decrease by 7.1 % and 13.1 %, respectively. A constitutive model for RSMAC is established by adapting the shape parameters of the recycled aggregate concrete model, accurately predicting its stress-strain relationship. Besides, microstructural analysis further discloses that the laminated weathered rock on the surface of RSMA adversely affects its interface transition zone with the cement mortar and thus significantly reduces the bond strength between RSMA and mortar matrix, constituting the primary cause of the overall deterioration in the mechanical properties of RSMAC. In practical channel engineering applications, RSMAC demonstrates favorable workability, achieving a compressive strength of 26.05 MPa and a water resistance grade exceeding W6. These properties confirm its viability as a green and economical material for hydraulic engineering.

受到长期环境影响（如风化和水力侵蚀）的水力石砌体通常会产生内部微裂缝和层状风化岩石，对回收材料生产的混凝土的性能构成潜在风险。因此，本研究系统地研究了再生石砌体骨料（RSMA）替代天然粗骨料生产的再生石砌体骨料混凝土（RSMA）的基本特性，重点研究了其力学性能、应力-应变关系和微观结构分析，并通过一个涉及河道重建项目的案例研究。结果表明：随着RSMA替代率的增加，混凝土的抗压强度和劈裂抗拉强度均呈下降趋势；与天然骨料混凝土相比，RSMAC的28 d抗压强度和劈裂抗拉强度分别降低了7.1 %和13.1 %。采用再生骨料混凝土模型的形状参数，建立了再生骨料混凝土的本构模型，准确预测了再生骨料混凝土的应力-应变关系。此外，微观结构分析进一步揭示了RSMA表面层状风化岩石对其与水泥砂浆的界面过渡区产生不利影响，从而显著降低了RSMA与砂浆基体的粘结强度，是导致RSMA整体力学性能恶化的主要原因。在实际河道工程应用中，RSMAC具有良好的和易性，抗压强度达到26.05 MPa，耐水等级超过W6。这些特性证实了它作为一种绿色和经济的水利工程材料的可行性。

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引用次数: 0

Effect of chemical treatment on the structure and properties of basalt fibers 化学处理对玄武岩纤维结构和性能的影响

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

Construction and Building Materials

Pub Date : 2026-01-23 DOI: 10.1016/j.conbuildmat.2026.145390

Hui Gao , Yunli Wang , Weilin Xu

This work systematically investigates the effects of five chemical treatments—hydrochloric acid (HCl), sodium hydroxide (NaOH), sodium chloride (NaCl), hydrogen peroxide (H₂O₂), and sodium dithionite (Na₂S₂O₄)—on the structure and properties of basalt fibers, aiming to optimize chemical modification strategies. The surface morphology of the basalt fiber samples was characterized using scanning electron microscopy (SEM). Their elemental composition was analyzed by X-ray photoelectron spectroscopy (XPS), energy dispersive spectroscopy (EDS), and inductively coupled plasma optical emission spectrometry (ICP-OES). Complementary techniques, including Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD), were employed to identify structural changes. Results indicate that acid etching primarily involves ion exchange, whereas alkali treatment disrupts the silicate network via Si–O bond cleavage by OH^– ions. Salt treatment induces minor changes through water and NaCl diffusion, while H₂O₂ and Na₂S₂O₄ treatments mainly involve redox reactions. Acidic and alkaline conditions exerted the most significant effects on surface morphology and structure, with basalt fibers demonstrating relatively higher acid resistance over alkali resistance. Alkali and oxidation treatments markedly enhanced fiber hydrophilicity, though alkali exposure reduced tensile performance. Vertical burning tests, thermogravimetric analysis (TGA), and heat release rate (HRR) confirmed that the treated specimens retained excellent flame retardancy. This work provides fundamental insights and experimental evidence to support the chemical modification of basalt fibers and the development of novel multifunctional composites for demanding environments.

本文系统研究了五种化学处理——盐酸（HCl）、氢氧化钠（NaOH）、氯化钠（NaCl）、过氧化氢（H2O2）和二亚硫酸钠（Na2S2O4）对玄武岩纤维结构和性能的影响，旨在优化化学改性策略。利用扫描电镜（SEM）对玄武岩纤维样品的表面形貌进行了表征。采用x射线光电子能谱（XPS）、能量色散能谱（EDS）和电感耦合等离子体发射光谱（ICP-OES）分析了它们的元素组成。利用傅里叶变换红外光谱（FTIR）和x射线衍射（XRD）等互补技术来鉴定结构变化。结果表明，酸蚀主要涉及离子交换，而碱处理通过OH -离子裂解Si-O键破坏硅酸盐网络。盐处理主要通过水和NaCl扩散引起少量变化，而H2O2和Na2S2O4处理主要是氧化还原反应。酸性和碱性条件对玄武岩纤维表面形态和结构的影响最为显著，玄武岩纤维的耐酸性能相对高于耐碱性能。碱和氧化处理显著提高了纤维的亲水性，但碱暴露降低了纤维的拉伸性能。垂直燃烧试验、热重分析（TGA）和热释放率（HRR）证实，处理后的样品保持了良好的阻燃性。这项工作为支持玄武岩纤维的化学改性和开发用于苛刻环境的新型多功能复合材料提供了基础见解和实验证据。

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引用次数: 0

Durability of cast-in-situ concrete with partial replacement of coarse aggregate by iron tailings under complex combined corrosion of sulfates and chlorides 硫酸盐、氯化物复合腐蚀条件下铁尾矿部分替代粗骨料现浇混凝土耐久性研究

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

Construction and Building Materials

Pub Date : 2026-01-22 DOI: 10.1016/j.conbuildmat.2026.145351

Gaowen Zhao , Chuxuan Yuan , Zhilong Chen , Yuchuan Fang , Cheng Wang , Liangliang Bao , Shijun Ding , Feng Wei

This study systematically investigates the effects of partially replacing coarse aggregates with iron tailings slag (ITS) on the durability of concrete under combined sulfate-chloride corrosion conditions. Concrete specimens with ITS replacement ratios of 0 %, 25 %, and 50 % were prepared and subjected to long-term immersion tests in distilled water and sulfate solutions for 540 days. By monitoring changes in specimen dimensions and mass, analyzing pore structures using NMR, and employing microstructural characterization techniques such as XRD, TG, and SEM, the corrosion mechanisms were systematically elucidated. The results show that after 540 days of immersion in sulfate solution alone, the compressive strength of specimens with 25 % and 50 % ITS replacement increased by 20.58 % and 10.78 %, respectively, compared to conventional specimens. Under combined corrosion conditions, the improvements were even more significant, reaching 37.19 % and 18.68 %, respectively. Specimens with a 25 % ITS replacement ratio demonstrated the most comprehensive durability performance. The study confirms that an appropriate amount of ITS significantly enhances the compactness and mechanical properties of concrete. Furthermore, the established random forest regression model exhibited high accuracy in predicting strength development under combined corrosion conditions. These findings provide an important theoretical basis and practical reference for the application of iron tailings slag in harsh corrosive environments.

本文系统研究了硫酸盐-氯化物复合腐蚀条件下，铁尾矿渣部分替代粗集料对混凝土耐久性的影响。制备ITS替代率分别为0 %、25 %和50 %的混凝土试件，在蒸馏水和硫酸盐溶液中进行540天的长期浸泡试验。通过监测试样尺寸和质量的变化，利用核磁共振分析孔隙结构，并采用XRD、TG和SEM等微观结构表征技术，系统地阐明了腐蚀机理。结果表明：单独浸泡硫酸盐溶液540 d后，ITS替代量为25% %和50% %的试件抗压强度分别比常规试件提高20.58 %和10.78 %；在复合腐蚀条件下，改善更为显著，分别达到37.19 %和18.68 %。ITS替换率为 % 25的试件耐久性表现最为全面。研究证实，适量的ITS可显著提高混凝土的密实度和力学性能。此外，所建立的随机森林回归模型对复合腐蚀条件下的强度发展具有较高的预测精度。研究结果为铁尾矿渣在恶劣腐蚀环境中的应用提供了重要的理论依据和实践参考。

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引用次数: 0

Dimensional stability of hydraulic engineered cementitious composites (HECC) based on supersulfated cement 超硫酸盐水泥水工胶凝复合材料（HECC）的尺寸稳定性

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

Construction and Building Materials

Pub Date : 2026-01-22 DOI: 10.1016/j.conbuildmat.2026.145366

Xuemei Zhang , Shuo Chang , Zhibing Liu , Yan Shi , Jiazheng Li , Shuhua Liu

The rockfill dam facing is a mass concrete structure that is constantly exposed to the external environment, and the presence of cracks has an impact on the overall safety of the dam. Excellent strain-hardening and crack-control properties are demonstrated by engineering cementitious composites (ECC). To resolve the issue of cracks readily forming in rockfill dam facing, this study pioneered the application of supersulfated cement in hydraulic engineering cementitious composites (HECC). It explored the advantages of supersulfated cement over other cementitious materials and investigated the effects of varying polyethylene (PE) fiber volume fractions on the dimensional stability and microstructure of supersulfated cement-based HECC. The experimental results indicate that supersulfated cement exhibited a delayed hydration heat release, a longer induction duration, and a prolonged final setting time of 45.5 h. The incorporation of supersulfated cement into mortar reduced shrinkage, with drying shrinkage and autogenous shrinkage values at 90 d recorded at 1416.04 μm/m and 842.17 μm/m, respectively. At the PE fiber volume fraction of 1 %, the supersulfated cement-based HECC exhibited not only strain-hardening characteristics but also achieved the compressive strength of 51.9 MPa. As the PE fiber volume fraction increased, both drying shrinkage and autogenous shrinkage of the supersulfated cement-based HECC decreased, enhancing dimensional stability. A 20.9 % decrease in drying shrinkage and a 16.25 % decrease in autogenous shrinkage at 28 d were achieved in the HECC with a 1 % PE fiber volume fraction. At the micro-scale, the micro-expansion effect of AFt in supersulfated cement contributes to reduced shrinkage. The porosity of the supersulfated cement mortar was relatively low at 12.39 %. The incorporation of PE fiber coarsened the pore structure, with the coarser pores helping to reduce shrinkage stresses and mitigate shrinkage. This study not only confirms the feasibility of supersulfated cement application in HECC but also provides a novel approach for mitigating crack formation in rockfill dam facing.

堆石坝面板是一种不断暴露于外界环境的大体积混凝土结构，裂缝的存在影响着大坝的整体安全。工程胶凝复合材料（ECC）具有良好的应变硬化和裂纹控制性能。为了解决堆石坝面板易形成裂缝的问题，本研究率先将超硫酸盐水泥应用于水利工程胶凝复合材料（HECC）中。探讨了超硫酸盐水泥相对于其他胶凝材料的优势，研究了不同聚乙烯（PE）纤维体积分数对超硫酸盐水泥基HECC尺寸稳定性和微观结构的影响。实验结果表明，超硫酸盐水泥的水化热释放延迟，诱导时间延长，终凝时间延长至45.5 h。掺入过硫酸盐水泥后，砂浆的干缩和自缩水率分别为1416.04 μm/m和842.17 μm/m。当PE纤维体积分数为1 %时，超硫酸盐水泥基HECC不仅表现出应变硬化特性，而且抗压强度达到51.9 MPa。随着PE纤维体积分数的增加，超硫酸盐水泥基HECC的干燥收缩率和自收缩率均减小，尺寸稳定性增强。在PE纤维体积分数为1 %的HECC中，28 d的干燥收缩率降低了20.9 %，自收缩率降低了16.25 %。在微观尺度上，AFt在过硫酸盐水泥中的微膨胀效应有助于减少收缩。超硫酸盐水泥砂浆孔隙率较低，为12.39 %。PE纤维的掺入使孔隙结构变粗，更粗的孔隙有助于减小收缩应力，减缓收缩。该研究不仅证实了超硫酸盐水泥在高强度混凝土中应用的可行性，而且为减轻堆石坝面板裂缝的形成提供了一种新的途径。

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引用次数: 0

Experimental evaluation of interface bond strength between concrete-concrete and concrete-grout in adjacent reinforced box girder bridges: A material-level investigation 相邻钢筋箱梁桥混凝土-混凝土和混凝土-浆液界面粘结强度试验评价：材料级研究

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

Construction and Building Materials

Pub Date : 2026-01-22 DOI: 10.1016/j.conbuildmat.2026.145333

Pratyusha Korrapati, Senthil Kumar N.

Slant shear and split tensile investigations helped to forecast the development of stresses for old-new concrete (concrete-concrete or concrete-grout) interfaces, used as a prerequisite in precast box beam bridge connections such as overlays, precast-to-cast-in-place joints, or patch repairs, which often involve bonded interfaces. A lack of bond strength between the interfaces might degrade the service life of a bridge. This study aims to evaluate the size effect on bond performance and stress transfer mechanism between conventional M50 & M70 concrete-concrete and M50 & M80-G concrete-grout interfaces from slant shear and split tensile specimens like prisms, cubes, and cylinders as per ASTM C882 and ASTM C496. A rough surface with a crisscross grid pattern was used to enhance bonding between interfaces. Image processing and fractal analysis techniques were used to understand the surface roughness at the interfacial zone. Due to the size effect, an increase in bond strength of 12.63 % & 18.21 % was observed for 75 mm and 100 mm diameter M50 & M70 and M50 & M80-G composite cylinders. The overall coefficient of variation in bond strength between prisms and cylinders of M50 & M70 was 8.80 % and 11.30 % for M50 & M80-G. The micrographs captured at the interfacial zone confirmed the development of hydration products like ettringite, tobermorite (C-S-H) gel, and calcium hydroxide. The developed bond strength, interface surface roughness, and grade of concrete at the connection showed a predominant role in transferring complex stresses, such as compression, shear, and tension, safely between the designed mixes.

斜剪和劈裂拉伸研究有助于预测新旧混凝土（混凝土-混凝土或混凝土-浆液）界面的应力发展，这是预制箱梁桥连接的先决条件，如覆盖层、预制-现浇连接或补丁修复，这些通常涉及粘合界面。接口之间缺乏粘结强度可能会降低桥的使用寿命。本研究旨在根据ASTM C882和ASTM C496的标准，从棱柱、立方体和圆柱体等斜剪和劈裂拉伸试样中，评估尺寸对传统M50和M70混凝土-混凝土和M50和M80-G混凝土-浆液界面之间的粘结性能和应力传递机制的影响。采用具有纵横交错网格图案的粗糙表面来增强界面之间的结合。利用图像处理和分形分析技术了解界面区域的表面粗糙度。由于尺寸效应，75 mm和100 mm直径的M50 &； M70和M50 &； M80-G复合材料柱的结合强度提高了12.63 %和18.21 %。M50 & M80-G的棱镜与圆柱体粘结强度总体变异系数分别为8.80 %和11.30 %。在界面区拍摄的显微照片证实了水化产物的发展，如钙矾石、托贝莫来石（C-S-H）凝胶和氢氧化钙。开发的粘结强度、界面表面粗糙度和连接处的混凝土等级在设计的混合料之间安全地传递复杂应力（如压缩、剪切和拉应力）方面发挥了主导作用。

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引用次数: 0