Construction and Building Materials最新文献

Moisture transport in CO2-cured cement-based materials with sufficient carbonation 充分碳化的co2固化水泥基材料中的水分迁移

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

Construction and Building Materials

Pub Date : 2026-02-04 DOI: 10.1016/j.conbuildmat.2026.145493

Bingbing Guo , Hang Zhou , Guixing Chu , Zhidong Zhang , Yan Wang , Ditao Niu

CO₂ curing has a great influence on the phase assemblages and pore structure in cement-based materials, thereby altering their moisture transport behaviors. However, the effect of CO₂ curing on the moisture transport in cement-based materials still remains unclear. In this study, the water vapor sorption isotherms (WVSIs), capillary water absorption, and drying kinetics of Ordinary Portland cement (OPC) and slag cement materials under CO₂ curing with sufficient carbonation were investigated. The variations in the pore structure caused by CO₂ curing were also examined by employing the surface fractal dimension based on MIP results. The WVSIs results indicate that the hysteresis phenomenon diminishes in CO₂-cured materials compared to standard-cured materials, which is attributed to the fact that CO₂ curing reduces the content of C-S-H gel and the amount of “ink-bottle” pores. CO₂ curing can lead to an increase in the capillary water absorption capacity of cement-based materials and a decrease in its moisture retention capacity due to the alteration in the pore structure. In addition, the drying kinetics results demonstrate that CO₂ curing leads to greater mass loss at a given RH. The inverse calculation shows an increase in the intrinsic permeability (K_l) of CO₂-cured specimens, and the K_l increases further with higher slag content. This trend is consistent with the observed increases in the water absorption coefficients and the reductions in the moisture retention capacity.

CO2固化对水泥基材料的相组合和孔隙结构有很大的影响，从而改变了水泥基材料的水分输运行为。然而，CO2固化对水泥基材料水分输运的影响尚不清楚。研究了普通硅酸盐水泥（OPC）和矿渣水泥材料在充分碳化的CO2养护条件下的水蒸气吸附等温线（WVSIs）、毛细吸水率和干燥动力学。采用基于MIP结果的表面分形维数分析了CO2固化引起的孔隙结构变化。wvsi结果表明，与标准固化材料相比，CO2固化材料的滞后现象减弱，这是由于CO2固化减少了C-S-H凝胶的含量和“墨水瓶”孔的数量。CO2固化会导致水泥基材料的毛细吸水能力增加，而由于孔隙结构的改变，使水泥基材料的保湿能力降低。此外，干燥动力学结果表明，在给定的相对湿度下，CO2固化导致更大的质量损失。反计算表明，co2固化试样的本征渗透率（Kl）增大，且随着渣含量的增加，Kl进一步增大。这一趋势与观察到的吸水系数的增加和保湿能力的降低是一致的。

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引用次数: 0

Preparation, application, and anti-icing performance of a composite oil film-encapsulated anti-icing agent 复合油膜封装防冰剂的制备、应用及防冰性能

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

Construction and Building Materials

Pub Date : 2026-02-04 DOI: 10.1016/j.conbuildmat.2026.145478

Qian Zhang , Xiaoya Hu , Yue Wang , Sheng Wu , Zhihe Fang , Jiuguang Geng

In the subtropical winter monsoon mountain regions of southeastern China with a one-month freezing period, the anti-icing fog seal course material is highly applicable to pavement deicing, while its effectiveness is impeded by premature demulsification caused by low-freezing-point filler. A composite oil film-encapsulated anti-icing agent was prepared using sodium chloride as the core material and waste engine oil/kerosene-diluted asphalt as the encapsulation material, and its preparation process was optimized through response surface methodology. The anti-icing agent content and optimal spraying rate of the fog seal course material were determined while verifying its pavement performance indicators against the standard. The scanning electron microscopy test, immersion test, freeze-thaw cycle test, wet wheel abrasion test, and field verification were employed to evaluate the long-term anti-icing performance and durability of the materials. The results indicate that the optimal mass ratio of waste engine oil, kerosene and base asphalt in the encapsulation liquid is 3.1 %, 4.6 % and 92.3 % respectively, with an encapsulation liquid temperature of 62.7 ℃. When the anti-icing agent content is 20 % and the recommended spraying rate is 0.6–0.9 kg/m², the fog seal course material exhibited excellent pavement performance. Before the deicing salt leached through surface micro-cracks, the encapsulation material provided a short-term water-resistant effect lasting up to 2 h, therefore avoiding premature demulsification. The anti-icing agent achieved an effective salt release amount of 90.6 %. The anti-icing fog seal course material demonstrated required durability and long-term anti-icing performance.

在冻结期为1个月的中国东南部亚热带冬季季风山区，防冰雾封层材料在路面除冰中具有较高的适用性，但由于填料的冰点较低，导致其过早破乳，影响了防冰雾封层材料的有效性。以氯化钠为芯材，废机油/煤油稀释沥青为包封材料，制备了复合油膜封装型防冰剂，并通过响应面法对其制备工艺进行了优化。通过对照标准对雾封层材料的路面性能指标进行验证，确定了雾封层材料的防冰剂用量和最佳喷淋量。通过扫描电镜试验、浸水试验、冻融循环试验、湿轮磨损试验和现场验证，对材料的长期抗冰性能和耐久性进行了评价。结果表明，包封液中废机油、煤油和基础沥青的最佳质量比分别为3.1 %、4.6 %和92.3 %，包封液温度为62.7℃。当防冰剂掺量为20 %，推荐喷施量为0.6 ~ 0.9 kg/m2时，雾封层材料具有优异的路用性能。在除冰盐通过表面微裂缝浸出之前，包封材料提供了短期的防水效果，持续时间可达2 h，从而避免了过早破乳。防冰剂的有效盐释放量为90.6 %。该防冰雾封层材料具有良好的耐久性和长期防冰性能。

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引用次数: 0

The influences of curing temperature and alite to belite ratio on the C-S-H structure characterized by X-ray diffraction x射线衍射表征了固化温度和铝白石比对C-S-H结构的影响

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

Construction and Building Materials

Pub Date : 2026-02-04 DOI: 10.1016/j.conbuildmat.2026.145453

Baoshan Guo , Xueyu Pang , Yongjin Yu , Jianqiang Wei , Xiujian Xia , Kaihe Lv , Jinsheng Sun

This paper introduces a general method for extracting the profile of C-S-H with Ca/Si ratios at and beyond 1.7 from X-ray diffraction (XRD) patterns of synthetic cement composed of alite and belite at 6 ratios (100/0, 80/20, 65/35, 50/50, 35/65, and 0/100) hydrated between 5℃ and 90℃. This method integrates the initial construction of a C-S-H model via asymmetric least squares (ALS) and partial or no known crystal structure (PONKCS) techniques, followed by iterative refinement using Rietveld full-pattern fitting and an external standard K-factor approach until convergence criteria are met, with thermogravimetric analysis employed as a cross-check to validate model accuracy. Deconvolution-based peak profile analysis reveals that C-S-H structurally resembles low-symmetry defect-bearing tobermorite, with low-temperature (≤30°C) C-S-H resembling anomalous type and high-temperature (≥50°C) C-S-H resembling normal type. Insights from crystal defect, main peak positions and intensities, and fingerprint zone reveal that the XRD patterns/structures of each C-S-H exhibit their unique characteristics, mainly as functions of cement composition and curing temperature. Elevated curing temperatures, high-belite contents, and low relative humidity were more favorable to yield C-S-H interlayer spacing data (11 ± 0.6 Å). The crystallinity of C-S-H improves as the temperature increases (excluding pure belite system). The morphology of C-S-H crystallites ranges from stable rods in most cement systems to metastable bricks formed from pure alite or belite, and occasionally to platelets, with all crystallites having a maximum dimension of 24.2 nm. Distinct from pure C-S-H, the XRD patterns of C-S-H formed in the hydration of synthetic cement obtained in this study provide reference data for quantitative analysis and molecular modeling of C-S-H in various types of calcium silicate cement.

本文介绍了在5℃~ 90℃水化范围内，从阿利石和白来石组成的6种配比（100/0、80/20、65/35、50/50、35/65和0/100）合成水泥的x射线衍射图中提取Ca/Si大于1.7的C-S-H剖面的一般方法。该方法通过非对称最小二乘（ALS）和部分或未知晶体结构（PONKCS）技术集成了C-S-H模型的初始构建，然后使用Rietveld全模式拟合和外部标准k因子方法进行迭代细化，直到满足收敛标准，并使用热重分析作为交叉检查来验证模型的准确性。基于反卷积的峰剖面分析表明，C- s - h在结构上类似于低对称性含缺陷的托伯莫里石，低温（≤30℃）C- s - h类似于异常型，高温（≥50℃）C- s - h类似于正常型。从晶体缺陷、主峰位置和强度以及指纹区等方面分析表明，每种C-S-H的XRD图谱/结构都有其独特的特征，主要是水泥成分和养护温度的函数。较高的固化温度、较高的白石含量和较低的相对湿度更有利于产生C-S-H层间距数据（11 ± 0.6 Å）。C-S-H的结晶度随温度升高而提高（不包括纯白石体系）。C-S-H晶体的形态范围从大多数水泥体系中的稳定棒状到纯阿利石或白橄榄石形成的亚稳砖状，偶尔也有血小板状，所有晶体的最大尺寸均为24.2 nm。与纯C-S-H不同，本研究获得的合成水泥水化过程中形成的C-S-H的XRD谱图为各类硅酸钙水泥中C-S-H的定量分析和分子建模提供了参考数据。

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引用次数: 0

Removal of free lime from thermally activated recycled cement powder using phosphoric acid modification 用磷酸改性法去除热活化再生水泥粉中的游离石灰

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

Construction and Building Materials

Pub Date : 2026-02-04 DOI: 10.1016/j.conbuildmat.2026.145437

Y.K. Chen , Y. Sun , Heongwon Suh , Taiyan Piao , Peiqi Li , Sungchul Bae

Thermal activation of waste concrete or cement fines is a potential approach for recycling these into reactive cementitious materials. However, the presence of residual free lime (f-CaO) causes a substantial heat release upon contact with water. Moreover, its rapid setting significantly limits the practical application of thermally activated recycled cement (T-RC). To address these challenges, this study proposes the chemical modification of T-RC using phosphoric acid (PA) with isopropanol (IPA) as the solvent. The physicochemical transformations in the T-RC particles, including the variations in the free lime content, particle size distribution, specific surface area, phase assemblage, and morphology, were characterized under varying PA concentrations in the solvent. In addition, the fluidity, setting time, isothermal hydration heat, compressive strength, hydration products, and pore structure of T-RC paste with and without PA modification were compared systematically. The results show that treating T-RC with 3 wt% PA for 2 h effectively reduced f-CaO content from 14.10 % to 4.35 %, without significantly altering the contents of other reactive mineral phases. Compared to the unmodified T-RC paste, the mini-slump and the final setting time of the modified T-RC paste have extended from 54.22 mm to 187.11 mm, and 20 mins to 160 mins, respectively. Most importantly, PA modification helps densify the pore structure in the matrix of T-RC paste, and its compressive strength is greatly increased from 3.74 MPa to 13.30 MPa (a 255 % increase) at 1 day and from 16 MPa to 31.32 MPa (a 196 % increase) at 28 days.

废混凝土或水泥粉的热活化是一种潜在的方法，回收这些成活性胶凝材料。然而，残留的游离石灰（f-CaO）在与水接触时会引起大量的热量释放。此外，它的快速凝结严重限制了热活化再生水泥（T-RC）的实际应用。为了解决这些问题，本研究提出了以磷酸（PA）和异丙醇（IPA）为溶剂对T-RC进行化学改性的方法。在不同的PA浓度下，表征了T-RC颗粒的物理化学转变，包括游离石灰含量、粒径分布、比表面积、相组合和形貌的变化。此外，系统比较了PA改性前后T-RC膏体的流动性、凝结时间、等温水化热、抗压强度、水化产物和孔隙结构。结果表明，用3 wt% PA处理T-RC 2 h， f-CaO含量由14.10 %降至4.35 %，其他活性矿物相含量无明显变化。与未改性T-RC膏体相比，改性T-RC膏体的微坍落度和终凝时间分别从54.22 mm延长至187.11 mm和20 min延长至160 min。最重要的是，PA改性有助于T-RC膏体基质孔隙结构的致密化，其抗压强度在1 天内从3.74 MPa提高到13.30 MPa（提高255 %），在28天内从16 MPa提高到31.32 MPa（提高196 %）。

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引用次数: 0

High-cycle fatigue behavior and microstructure of laser-cladding additively manufactured 316L stainless steel sheets with different anisotropy orientations 不同各向异性取向316L不锈钢板激光熔覆增材制造的高周疲劳行为与显微组织

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

Construction and Building Materials

Pub Date : 2026-01-31 DOI: 10.1016/j.conbuildmat.2026.145465

Bochen Li , Xinpei Liu , Di Wang , Nan Hu , Lan Kang

Laser Cladding (LC) technology shows great potential in the repair and fabrication of steel structures. However, studies on the influence of orientations on high-cycle fatigue (HCF) performance remain limited. This work investigates 316L stainless steel sheets fabricated under different anisotropy orientations. The microstructure were characterized using optical microscopy, electron backscatter diffraction (EBSD), and X-ray computed tomography (X-ray CT) followed by HCF tests and S–N curve analyses. The results indicate that the anisotropy orientation affects both the grain morphology and defect characteristics. The fatigue mechanism shows that, defects dominate at high stresses, while material strength governs at low stresses. The fatigue mechanism shows that defects dominate at high stresses, while material strength governs at low stresses. Overall, fatigue differences among orientations are small, displaying quasi-isotropic characteristics. Finally, an engineering fatigue curve model was established and benchmarked against fatigue design curves in different codes, demonstrating its reasonableness and feasibility for fatigue design.

激光熔覆技术在钢结构修复和制造中显示出巨大的潜力。然而，关于取向对高周疲劳性能影响的研究仍然有限。本文研究了在不同各向异性取向下制备的316L不锈钢薄板。利用光学显微镜、电子背散射衍射（EBSD）、x射线计算机断层扫描（x射线CT）、HCF测试和S-N曲线分析对其微观结构进行了表征。结果表明，各向异性取向对晶粒形貌和缺陷特征都有影响。疲劳机制表明，在高应力下，缺陷占主导地位，而在低应力下，材料强度占主导地位。疲劳机制表明，在高应力下，缺陷占主导地位，而在低应力下，材料强度占主导地位。总体而言，不同取向间的疲劳差异较小，呈现准各向同性特征。最后，建立了工程疲劳曲线模型，并与不同规范的疲劳设计曲线进行了对比，验证了该模型用于疲劳设计的合理性和可行性。

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引用次数: 0

Which one among the in-situ formed calcite, aragonite or vaterite is more beneficial to the carbonated γ-C2S performance: Mechanical strength, pore structure 原位形成的方解石、文石、水晶石中哪一种更有利于碳化γ-C2S性能：机械强度、孔隙结构

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

Construction and Building Materials

Pub Date : 2026-01-31 DOI: 10.1016/j.conbuildmat.2026.145420

Jinquan Qi , Liting Yu , Guangzhi Wang , Zhihang Hu , Hongya Shen , Bao Lu , Ruiyu Jiang , Wei Xu , Rong Shao , Guihua Hou

Among the three polymorphs of CaCO₃ (calcite, aragonite, and vaterite) that may form during the carbonation of calcium silicate, it is still unclear which one is most beneficial to the material properties, and this issue is crucial for the performance-oriented design of such materials. This study employed crystal modifiers to prepare three carbonated γ-C₂S samples dominated by calcite (Type C), aragonite (Type A), and vaterite (Type V), respectively. Their mechanical properties, microstructure were systematically compared. Results showed that, at an equal degree of carbonation, the flexural and compressive strength followed Type A > Type V > Type C. Microstructurally, needle-like aragonite best refined the pore structure, yielding the lowest porosity and most probable pore size, Whereas the cubic calcite in Type C created vertex-to-face, vertex-to-edge, edge-to-face, and edge-to-edge contacts, generating pores around the contact points, and resulting in its highest porosity. These findings indicate that Type A offers the greatest advantage for the mechanical performance. This result offers a novel perspective for producing high-quality bulk building materials from calcium silicate-based waste residues via the carbonation method.

在硅酸钙碳酸化过程中可能形成的三种CaCO3多晶态（方解石、文石和水晶石）中，哪一种对材料性能最有利尚不清楚，这一问题对材料的性能导向设计至关重要。本研究采用晶体改性剂分别制备了以方解石（C型）、文石（A型）和水晶石（V型）为主的3种碳化γ-C2S样品。系统比较了两种材料的力学性能、显微组织。结果表明，在相同碳酸化程度下，A型>； 型V >； 型C。微观结构上，针状文石最能细化孔隙结构，产生最低孔隙率和最大孔径，而C型立方方解石则产生点对面、点对边、边对面和边对边接触，在接触点周围产生孔隙，孔隙率最高。这些结果表明，A型具有最大的机械性能优势。这一结果为通过碳酸化方法从硅酸钙基废渣中生产高质量的块状建筑材料提供了新的视角。

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引用次数: 0

AFm phase chloride binding: Kinetic advantages of monocarbonate over monosulfate and the role of calcium availability AFm相氯化物结合：单碳酸盐相对于单硫酸盐的动力学优势和钙可用性的作用

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

Construction and Building Materials

Pub Date : 2026-01-31 DOI: 10.1016/j.conbuildmat.2026.145442

Wei Sun , Yong Wang , Fuqiang He , Lixuan Mao , Jin Zhou , Dan Yi , Changping Chen

Chloride binding by the AFm phase through interlayer anion exchange plays a critical role in mitigating reinforcement corrosion in cementitious materials. This study compares the binding kinetics of monocarbonate (Mc) and monosulfate (Ms) and evaluates the influence of calcium availability in chloride solutions on chloride uptake behavior. Pure Mc and Ms crystals are synthesized and immersed in CaCl₂ and NaCl solutions, with ion concentrations and solid phases monitored over time. Results show that Mc exhibits a higher binding rate than Ms, and that chloride binding is jointly governed by the transformation pathway and the availability of Ca²⁺. Under calcium-rich conditions, Mc rapidly converts to Friedel’s salt, whereas Ms forms Kuzel’s salts and ettringite that limit net chloride uptake. When Ca²⁺ is insufficient, competition for Ca²⁺ destabilizes AFm and reduces chloride binding. These findings highlight the kinetic advantages of Mc and the decisive role of calcium in sustaining chloride immobilization.

AFm相通过层间阴离子交换将氯离子结合在胶结材料中，对减轻钢筋腐蚀起着关键作用。本研究比较了单碳酸盐（Mc）和单硫酸盐（Ms）的结合动力学，并评估了氯溶液中钙的可用性对氯摄取行为的影响。合成了纯Mc和Ms晶体，并将其浸入cacl2和NaCl溶液中，随时间监测离子浓度和固相。结果表明，Mc的结合速率高于Ms，并且氯离子的结合是由转化途径和Ca2+的可用性共同控制的。在富含钙的条件下，Mc迅速转化为弗里德尔盐，而Ms形成库泽尔盐和钙矾石，限制净氯化物的吸收。当Ca2+不足时，对Ca2+的竞争使AFm不稳定并减少氯离子结合。这些发现突出了Mc的动力学优势和钙在维持氯离子固定中的决定性作用。

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引用次数: 0

Evaluation of mixed mode I/II fracture behavior of asphalt concretes containing polyvinyl alcohol and coconut fibers 含聚乙烯醇和椰子纤维沥青混凝土I/II混合模式断裂性能评价

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

Construction and Building Materials

Pub Date : 2026-01-31 DOI: 10.1016/j.conbuildmat.2026.145200

Morteza Haghdoust , Majid-Reza Ayatollahi , Sadjad Pirmohammad

This research investigated the fracture resistance of hot mix asphalt (HMA) mixtures reinforced with polyvinyl alcohol (PVA) and coconut fibers under varying temperatures and fiber contents. The mixtures were prepared with fibers of a constant length of 12 mm and contents of 0.1 %, 0.2 %, and 0.3 % by total weight. We conducted fracture tests on Semi-Circular Bend (SCB) specimens at temperatures of −5°C, −15°C, and −25°C under pure mode I, pure mode II, and mixed-mode I/II loading. A key novelty of this study lies in the dual comparison of synthetic PVA fibers and natural coconut fibers, highlighting their different contributions to fracture toughness and fracture energy under multiple loading and at different temperatures. The results demonstrated that both PVA and coconut fibers significantly enhanced the fracture resistance of the HMA mixtures. The optimal fiber content was determined to be 0.1 % for PVA and 0.2 % for coconut fibers, as higher contents resulted in a decline in both fracture toughness and fracture energy. A decrease in test temperature led to an increase in fracture toughness for both control and fiber-reinforced samples, but it simultaneously caused a reduction in fracture energy. Furthermore, the fracture parameters were significantly influenced by the loading mode. For both fiber types, the greatest relative enhancement in fracture toughness occurred under pure mode II loading at −15 °C when compared with the control mixture, whereas at −25 °C, the most significant relative improvement was observed under pure mode I loading. Finally, in terms of both fracture energy and fracture toughness, coconut fibers outperformed PVA ones, making them the better choice for reinforcing asphalt mixtures subjected to cold climates and complex loading conditions.

研究了聚乙烯醇（PVA）和椰子纤维增强热拌沥青（HMA）混合料在不同温度和纤维含量下的抗断裂性能。该混合物的纤维长度为12 mm，纤维的总质量比分别为0.1 %、0.2 %和0.3 %。我们在- 5°C、- 15°C和- 25°C的温度下对半圆弯曲（SCB）试样进行了纯模式I、纯模式II和混合模式I/II加载下的断裂测试。本研究的一个关键新颖之处在于对合成PVA纤维和天然椰子纤维进行了双重比较，突出了它们在多重载荷和不同温度下对断裂韧性和断裂能的不同贡献。结果表明，PVA和椰子纤维均显著提高了HMA混合料的抗断裂性能。PVA和椰子纤维的最佳纤维含量分别为0.1 %和0.2 %，较高的纤维含量会导致断裂韧性和断裂能的下降。降低测试温度导致对照和纤维增强试样的断裂韧性增加，但同时导致断裂能降低。此外，加载方式对断裂参数有显著影响。对于两种类型的纤维，与对照混合物相比，在- 15°C的纯II模式加载下，断裂韧性的相对增强最大，而在- 25°C的纯I模式加载下，断裂韧性的相对增强最为显著。最后，在断裂能和断裂韧性方面，椰子纤维都优于PVA纤维，是寒冷气候和复杂载荷条件下增强沥青混合料的较好选择。

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引用次数: 0

Hysteretic behavior of shear panel damper with different corrugation profiles for double-column bridge piers 双柱桥墩不同波纹型剪力板阻尼器滞回特性研究

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

Construction and Building Materials

Pub Date : 2026-01-31 DOI: 10.1016/j.conbuildmat.2026.145445

Jun He , Chao Luo , Sidong Feng , Yongsheng Zhu , Gao Liu , Haohui Xin , M.F. Hassanein

This study introduces a replaceable shear panel damper with a corrugated steel web (SPD-CSW) as an energy dissipation device. Its purpose is to enhance the seismic performance and post-earthquake repairability of bridge structures. The effects of the corrugation profile—trapezoidal, rectangular, sinusoidal, and zigzag—and its key geometric parameter, the wave depth-to-length ratio (d_w/L_w), on the hysteretic behavior of the SPD-CSW were systematically investigated using experimentally validated finite element (FE) models. Numerical results indicate that the corrugation profile is the dominant factor affecting cyclic performance. The trapezoidal corrugated steel web (TCSW) SPD with a d_w/L_w of 0.358 achieved the highest over-strength factor and ductility coefficient. Under the same d_w/L_w of 0.208, the sinusoidal corrugated steel web (SCSW) SPD demonstrated the highest energy dissipation efficiency, while the rectangular corrugated steel web (RCSW) SPD exhibited the poorest performance due to significant stress concentration. A multi-criteria evaluation framework, based on a comprehensive set of hysteretic performance metrics, was established. When the span-to-height ratio of SPD-CSWs was 1.89, the SCSW SPD with d_w/L_w= 0.208 exhibited relatively stable hysteretic performance. Finally, this study derived simplified design equations to predict the skeleton curve of SPDs based on the web geometry and material properties. These formulas can effectively predict their strength and stiffness, and approach agrees well with FE simulation results. These findings provide valuable insights for structural optimization and practical guidance for the seismic design of SPD-CSW systems in double-column bridge piers.

本文介绍了一种波纹钢腹板可更换剪力板减振器作为耗能装置。其目的是提高桥梁结构的抗震性能和震后修复能力。利用实验验证的有限元模型，系统研究了波纹型（梯形、矩形、正弦和之字形）及其关键几何参数波深长比（dw/Lw）对SPD-CSW滞回特性的影响。数值结果表明，波纹型是影响循环性能的主要因素。dw/Lw为0.358的梯形波形钢腹板SPD的超强系数和延性系数最高。在相同的dw/Lw为0.208的情况下，正弦波形钢腹板（SCSW）的耗能效率最高，矩形波形钢腹板（RCSW）的耗能效率最差，且存在较大的应力集中。基于一套综合滞后性能指标，建立了多准则评价框架。当SPD- csws的跨高比为1.89时，dw/Lw= 0.208的SCSW SPD表现出相对稳定的滞回性能。最后，根据腹板几何形状和材料性能，推导出简化设计方程，预测spd的骨架曲线。这些公式能有效地预测其强度和刚度，与有限元模拟结果吻合较好。这些发现为双柱桥墩SPD-CSW体系的结构优化和抗震设计提供了有价值的见解和实践指导。

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引用次数: 0

Experimental study on the fire resistance of ultra-high performance fiber-reinforced cementitious composites past a cooling-induced thermal shock 超高性能纤维增强胶凝复合材料冷却热冲击耐火性能试验研究

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

Construction and Building Materials

Pub Date : 2026-01-31 DOI: 10.1016/j.conbuildmat.2026.145456

Jijun Miao , Yafei Yu , Xinyang Wang , Dongshuai Hou , Jianzhuang Xiao , Xinpeng Wang , Zhen Han

The high-temperature behavior and the explosive spalling of ultra-high performance fiber-reinforced cementitio composites (UHPFRCCs) have been the subject of many studies, while the thermal shock during the cooling phase and its effect on the residual compressive strength have been largely unexplored so far. To fill such a knowledge gap, this research project is focused on the effects that different cooling regimes (immersion cooling and natural cooling) have on the residual performances of UHPFRCCs from the microscopic level. Seven mixes were investigated, utilizing only fine aggregates with a maximum particle size of 0.6 mm: one reference mix and six mixes containing polymeric fibers (polypropylene, polyethylene, or polyvinyl alcohol fibers), with or without small amounts of steel fibers. The results show the compressive strength on cubes of UHPFRCCs was comprised between 112.7 and 155.5 MPa at ambient temperature. The water cooling by immersion causes more damage in the UHPFRCCs than natural cooling in air, since the positive effects of “steam curing” (around 100 °C) and “pore replenishment” during immersion cooling do not offset the negative effect of the thermal shock during fast cooling. In the case of water-immersion cooling, rehydration and pozzolanic reactions refine the pore structure by transforming large capillary pores into medium capillary pores (< 50 nm), whereas thermal shock induces a significant proliferation of through microcracks (> 10 μm). The microcracks appear to be the prevailing factor in the degradation of mechanical properties. Such a fact should be taken care of in the evaluation of residual strength on UHPFRCCs after cooling down to ambient temperature by water immersion.

超高性能纤维增强胶凝复合材料（uhpfrcc）的高温性能和爆炸剥落是许多研究的主题，而冷却阶段的热冲击及其对残余抗压强度的影响迄今尚未得到深入研究。为了填补这一知识空白，本研究项目侧重于从微观层面研究不同冷却方式（浸没冷却和自然冷却）对uhpfrcc残留性能的影响。研究了七种混合料，仅使用最大粒径为0.6 mm的细骨料：一种参考混合料和六种含有聚合纤维（聚丙烯、聚乙烯或聚乙烯醇纤维）的混合料，含有或不含少量钢纤维。结果表明：常温下uhpfrcc立方体的抗压强度在112.7 ~ 155.5 MPa之间；在uhpfrcc中，浸没水冷却比空气自然冷却造成的损害更大，因为浸没冷却期间的“蒸汽固化”（约100°C）和“孔隙补充”的积极影响并不能抵消快速冷却期间热冲击的负面影响。在水浸冷却的情况下，复水化和火山灰反应细化了孔隙结构，将大的毛细孔转变为中等的毛细孔（< 50 nm），而热冲击诱导了通过微裂纹（> 10 μm）的显著扩散。微裂纹是导致材料力学性能退化的主要因素。在评估uhpfrcc经水浸泡冷却至环境温度后的剩余强度时，应考虑到这一事实。

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