Construction and Building Materials最新文献_第6页

Asphalt concretes including bitumen modified with compounds based on crumb rubber from waste tires: A laboratory and field study 含废轮胎橡胶屑化合物改性沥青的沥青混凝土：实验室和实地研究

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

Construction and Building Materials

Pub Date : 2025-12-16 DOI: 10.1016/j.conbuildmat.2025.144911

Carlo Carpani , Edoardo Bocci , Giovanni Marchegiani , Dora Moliterni

End-of-life tires represent one of the major waste streams in terms of volume generated annually, worldwide. One of the possible destinations for the waste rubber from end-of-life tires is asphalt concrete, but the many recycling techniques that are currently adopted in different countries present disadvantages (economic, logistic or performance) that hinder their diffusion. An innovative technology has been recently developed, dealing with the use of waste rubber in the production of compounds for bitumen modification, in partial or total replacement of the styrene-butadiene-styrene (SBS) polymers. The objective of the present paper is the characterization of hot-mix asphalt (HMA) made with compound-modified bitumen. The investigated mixes were produced in the laboratory and in the asphalt plant; the latter were laid on a trial highway section. The shear-gyratory compacted specimens and the cores taken from the trial section were analysed in terms of volumetric properties, indirect tensile strength, stiffness and fatigue performance. The experimental data were statistically validated through t-test. The results showed that the HMA with compound-modified bitumen, compared to the HMA with SBS-modified bitumen, had similar voids content, stiffness and strength, but a slightly improved fatigue performance (+15 % on both ε₆ and σ₆ parameters), which can be associated with a lower severity of the ageing experienced by the binder during the mixing. The combined use of SBS and compound modifiers may entail an increase (about 30 %) of the HMA stiffness.

报废轮胎是全球每年产生的主要废物流之一。废旧轮胎产生的废橡胶的可能目的地之一是沥青混凝土，但目前在不同国家采用的许多回收技术存在不利因素（经济、物流或性能），阻碍了它们的扩散。最近开发了一项创新技术，利用废橡胶生产沥青改性化合物，部分或全部替代苯乙烯-丁二烯-苯乙烯（SBS）聚合物。本文的目的是表征复合改性沥青制成的热混合沥青（HMA）。所研究的混合料是在实验室和沥青厂生产的；后者被铺设在公路试验路段。对试验截面上的剪切-旋回压实试样和岩心的体积性能、间接抗拉强度、刚度和疲劳性能进行了分析。实验数据采用t检验进行统计学验证。结果表明：复合改性沥青混合料的孔隙率、刚度和强度与sbs改性沥青混合料相似，但其疲劳性能略有改善（ε6和σ6参数均为+15 %），这与混合过程中粘结剂的老化程度较低有关。SBS和复合改性剂的联合使用可能会增加HMA的刚度（约30 %）。

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引用次数: 0

Development of high-performance one-part geopolymer foam concrete using ground granulated blast furnace slag, waste concrete sludge, and bamboo powder for sustainable construction 利用磨粒高炉渣、废混凝土污泥、竹粉开发可持续建筑高性能单组分地聚合物泡沫混凝土

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

Construction and Building Materials

Pub Date : 2025-12-16 DOI: 10.1016/j.conbuildmat.2025.144827

Md Foysal Faraji , Halil Oğuzhan Kara , Mehernaz Raazi , Mehtiali Ahıskalı , Ceren Eskici , Oğuzhan Yavuz Bayraktar , Gökhan Kaplan , Abdulkadir Cüneyt Aydın , Togay Ozbakkaloglu

One-part geopolymer foam concrete (GFC) represents a sustainable alternative to traditional cementitious materials. This study investigates the influence of waste valorization on the performance of GFCs using ground-granulated blast-furnace slag (GBFS), waste concrete sludge (WCS), and waste bamboo powder (WBP), activated with sodium metasilicate. The GFCs were thermally cured and evaluated for workability, mechanical properties, durability, and microstructural changes. Mixes were characterized by compressive strength, flexural strength, density, water absorption, shrinkage, freeze-thaw durability, high-temperature resistance, and thermal conductivity. The results show that mix 0CS-BP5, containing 5 % WBP and no WCS, achieved the highest compressive strength (7 d: 7.6 MPa, 28 d: 11.4 MPa) and flexural strength (28 d: 1.2 MPa) owing to improved pore structure and crack-bridging from WBP. The incorporation of WBP reduced water absorption by 39 % and 91-day drying shrinkage by 52 % compared to the control mix (0CS-BP0). Thermal conductivity ranged from 0.32 to 0.43 W/m·K across mixes, offering a balance between insulation and mechanical strength. Mix 0CS-BP5 exhibited superior freeze-thaw durability, with only 3.6 % mass loss after 50 cycles. Furthermore, it retained 3.0 MPa compressive strength at 750° C, indicating enhanced high-temperature resistance. However, mixes with higher WCS content (e.g., mix 25CS-BP5) showed a decline in strength and transport properties due to their heterogeneous structure and increased macro-void connectivity. This study demonstrates the potential of utilizing industrial and biowaste to develop high-performance, low-carbon GFCs, advancing the use of sustainable materials for energy-efficient and durable construction applications.

单组分地聚合物泡沫混凝土（GFC）代表了传统胶凝材料的可持续替代品。摘要本研究以偏硅酸钠为活化剂，研究了垃圾活化对高炉磨粒渣（GBFS）、废混凝土污泥（WCS）和废竹粉（WBP）的GFCs性能的影响。对GFCs进行了热固化，并对其可加工性、机械性能、耐久性和微观结构变化进行了评估。混合料的特征包括抗压强度、抗弯强度、密度、吸水性、收缩率、冻融耐久性、耐高温性和导热性。结果表明，WBP含量为5% %且不含WCS的0CS-BP5，由于WBP改善了孔隙结构和裂缝的桥接作用，其抗压强度（7 d: 7.6 MPa, 28 d: 11.4 MPa）和抗弯强度（28 d: 1.2 MPa）最高。与对照混合物（0CS-BP0）相比，WBP的掺入使吸水率降低了39% %，91天干燥收缩率降低了52% %。混合材料的导热系数范围为0.32至0.43 W/m·K，在绝缘和机械强度之间取得了平衡。混合料0CS-BP5表现出优异的冻融耐久性，循环50次后质量损失仅为3.6% %。750℃时抗压强度保持3.0 MPa，耐高温性能增强。然而，WCS含量较高的混合料（如25CS-BP5混合料）由于其非均质结构和宏观孔隙连通性增加，强度和输运性能下降。这项研究展示了利用工业和生物废物开发高性能、低碳的GFCs的潜力，促进了可持续材料在节能和耐用建筑应用中的使用。

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引用次数: 0

Interfacial bonding behavior of geopolymer concrete: Numerical simulation of uniaxial compression based on a cohesive strength model 地聚合物混凝土界面粘结行为：基于内聚强度模型的单轴压缩数值模拟

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

Construction and Building Materials

Pub Date : 2025-12-15 DOI: 10.1016/j.conbuildmat.2025.144883

Chao Cui , Jinming Hu , Pengxia Li , Yuan Li , Lan Wang , Hui Peng

The interfacial transition zone (ITZ), as the weak link between the geopolymer matrix and aggregates, plays a decisive role in determining the mechanical performance of geopolymer concrete through its bonding properties. In this study, geopolymer concrete was prepared using alkali–slag–metakaolin (ASM)-based binders combined with granite, basalt, and limestone aggregates, with the objective of elucidating the ITZ formation mechanism and establishing the relationship between ITZ bonding properties and the uniaxial compressive performance of the concrete. Based on these investigations, a cohesion model for the ITZ was developed and employed to numerically simulate the uniaxial compressive damage behavior of ASM-based geopolymer concrete, with the simulation results compared against experimental data. The findings reveal that active Si, Al, and Ca species, dissolved from the aggregates under the action of the highly alkaline activator, can participate in geopolymerization reactions at the interface, thereby enhancing ITZ bonding strength. As the alkali equivalent increases, the ITZ bonding strength shows a gradual improvement. Among the mixtures tested, the geopolymer–granite ITZ exhibited the highest bonding performance, followed by basalt, whereas limestone displayed relatively lower performance. The numerical simulation results based on the ITZ cohesion model demonstrated close agreement with experimental measurements, confirming the model’s applicability for simulating the uniaxial compression behavior of geopolymer concrete. Overall, this study provides a solid theoretical basis and practical guidance for optimizing the performance and advancing the engineering application of geopolymer concrete.

界面过渡区（ITZ）作为地聚合物基体与骨料之间的薄弱环节，其粘结性能对地聚合物混凝土的力学性能起决定性作用。本研究采用碱渣偏高岭土（ASM）基粘结剂与花岗岩、玄武岩和石灰石骨料结合制备地聚合物混凝土，旨在阐明ITZ的形成机理，建立ITZ粘结性能与混凝土单轴抗压性能之间的关系。在此基础上，建立了一种ITZ黏聚力模型，并对asm型地聚合物混凝土的单轴压缩损伤行为进行了数值模拟，并将模拟结果与实验数据进行了比较。结果表明，在高碱性活化剂的作用下，活性Si、Al和Ca从团聚体中溶解出来，参与界面处的地聚合反应，从而增强了ITZ键合强度。随着碱当量的增加，ITZ结合强度逐渐提高。在试验混合物中，地聚合物-花岗岩的粘接性能最高，其次是玄武岩，而石灰岩的粘接性能相对较低。基于ITZ黏聚力模型的数值模拟结果与实验测量结果吻合较好，验证了该模型对地聚合物混凝土单轴压缩特性的模拟适用性。总体而言，本研究为优化地聚合物混凝土的性能和推进其工程应用提供了坚实的理论基础和实践指导。

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引用次数: 0

Material choice for carbonated aggregates: Governing ITZ optimization in concrete 碳化骨料的材料选择：控制混凝土中的ITZ优化

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

Construction and Building Materials

Pub Date : 2025-12-15 DOI: 10.1016/j.conbuildmat.2025.144908

Pengfei Ren , Ming-Zhi Guo , Rumeng Chen , Tung-Chai Ling

The incorporation of carbonated artificial aggregates (AAs) presents a promising strategy for improving the interfacial transition zone (ITZ) in concrete. This improvement is primarily due to the formation of reactive calcium carbonate (CaCO₃) layers on aggregate surfaces. Notably, the morphology and fineness of CaCO₃ are strongly affected by the choice of raw materials, which directly affect their effectiveness in improving the ITZ performance. This study systematically investigates the impact of carbonate layers derived from concrete slurry waste (CSW) and steel slag (SS) aggregates on the ITZ performance. The results demonstrate that the presence of a reactive calcite layer on the aggregate surface effectively improves the compressive strength of concrete regardless of aggregate types due to the formation of more hydration products by combining physical nucleation and chemical reactions. However, nanoscale calcite formed on carbonated SS aggregate (CSSA) exhibits greater reactivity compared with agglomerated microscale calcite on carbonated CSW aggregates (CCWA), promoting the increased formation of carboaluminates and calcium silicate hydrate gels within ITZ. The substantial improvement in CSSA strength and ITZ properties contributes to enhanced compressive strengths comparable to that of natural aggregate (NA) concrete, demonstrating that CSSA is a viable NA substitute without compromising the mechanical performance.

碳化人工骨料（AAs）的掺入是改善混凝土界面过渡区（ITZ）的一种很有前途的策略。这种改善主要是由于在骨料表面形成了活性碳酸钙（CaCO3）层。值得注意的是，CaCO3的形貌和细度受到原材料选择的强烈影响，直接影响其提高ITZ性能的有效性。本研究系统地研究了混凝土浆体废料（CSW）和钢渣（SS）骨料的碳酸盐层对ITZ性能的影响。结果表明，骨料表面活性方解石层的存在，通过物理成核和化学反应相结合，形成更多的水化产物，有效提高了混凝土的抗压强度，无论骨料类型如何。然而，在碳化SS聚集体（CSSA）上形成的纳米级方解石比在碳化CSW聚集体（CCWA）上形成的微尺度方解石表现出更强的反应活性，促进了ITZ内碳铝酸盐和水合硅酸钙凝胶的形成。CSSA强度和ITZ性能的大幅提高有助于提高抗压强度，可与天然骨料（NA）混凝土相媲美，表明CSSA是一种可行的NA替代品，而不会影响力学性能。

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引用次数: 0

Influence of CO2 curing on carbonation depth, phase composition, and micro-mechanical properties of FBC ash-blended cementitious materials CO2固化对粉煤灰胶凝材料碳化深度、相组成及微观力学性能的影响

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

Construction and Building Materials

Pub Date : 2025-12-15 DOI: 10.1016/j.conbuildmat.2025.144872

Heejung Jun , Seongho Han , Sanghwon Wi , Jinyoung Yoon

This study investigates the physicochemical and mechanical performance of cementitious composites incorporating fluidized bed combustion (FBC) ash under accelerated carbon dioxide (CO₂) curing. FBC ash, due to its high contents of free calcium oxide (CaO) and sulfate (SO₃), has been reported to cause challenges, such as volume instability and lower early-age strength. To address these limitations, CO₂ curing was applied to promote accelerated carbonation and stabilize the hydration products. Cement paste and mortar samples, made with up to 40 % by cement weight replacement with FBC ash (labelled CF), were subjected to either CO₂ curing or conventional water curing for 28 d. Compressive strength results indicated that CO₂ curing significantly improved the mechanical performance at both early and later ages, especially for the CF (CaO-rich) series, due to the formation of calcium carbonate (CaCO₃). Carbonation depth analysis and thermogravimetric analysis (TGA) confirmed extensive conversion of calcium hydroxide (Ca(OH)₂) to CaCO₃ in fully carbonated zones. X-ray diffraction (XRD) supported the disappearance of portlandite and intensified calcite peaks in CO₂-cured samples. Nanoindentation measurements for CO₂-cured cementitious materials incorporating CF demonstrated that carbonated regions exhibited 80 % higher compared to non-carbonated zones.

研究了流化床燃烧灰分胶凝复合材料在二氧化碳加速养护下的物理化学和力学性能。FBC灰分由于其高含量的游离氧化钙（CaO）和硫酸盐（SO3），造成了诸如体积不稳定和较低的早期强度等问题。为了解决这些限制，采用CO2固化来促进加速碳酸化和稳定水化产物。用FBC灰（标记为CF）代替水泥重量达40% %的水泥浆和砂浆样品，进行CO2养护或常规水养护28天。抗压强度结果表明，CO2养护在早期和后期都显著改善了机械性能，特别是对于CF（富cao）系列，由于碳酸钙（CaCO3）的形成。碳酸化深度分析和热重分析（TGA）证实了在完全碳酸化带中氢氧化钙（Ca(OH)2）向CaCO3的广泛转化。x射线衍射（XRD）证实了co2固化样品中硅酸盐的消失和方解石峰的增强。对含有CF的二氧化碳固化胶凝材料的纳米压痕测量表明，碳化区比非碳化区表现出80 %的高。

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引用次数: 0

The conservation of gypsification lime mortar using high permeability barium solution as a protectant 采用高渗透性钡溶液作为保护剂保护石膏石灰砂浆

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

Construction and Building Materials

Pub Date : 2025-12-15 DOI: 10.1016/j.conbuildmat.2025.144862

Qing Liu , Ruicong Lu , Jingchen Yan , Yan Liu , Fuwei Yang , Kun Zhang , Xiangnan Li

Gypsification is a common and detrimental weathering phenomenon for lime mortar in historic buildings, especially in sulfuric acid rain regions. Among the existing protective agents, the solution of barium hydroxide in water (BW) was once given the utmost anticipation upon its action mechanism of transformation of harmful gypsum into protective barium sulfate and calcium carbonate. However, the performance of BW was far from satisfactory in the practical application due to its poor permeability. To this end, the solution of barium hydroxide in methanol (BM) is investigated as a new protectant in this study, utilizing scanning electron microscopy attached to energy-dispersive X-ray spectroscopy (SEM-EDX), X-ray diffraction spectroscopy (XRD), Fourier transform infrared spectroscopy (FTIR), and protective performance tests. The results indicate that BM is good in permeability, and the underlying principle lies in its excellent stability in air and gypsum substrate. After treatment by BM and water in sequence, the protective performance for the gypsified lime mortar is desirable, including weatherability enhancement, strength improvement, appearance maintenance, and so on. BM is thus promising in the conservation of the calcareous objects that suffered gypsification damage in construction relics.

石膏化是历史建筑石灰砂浆常见的有害风化现象，特别是在硫酸雨地区。在现有的保护剂中，氢氧化钡水溶液（BW）的作用机理是将有害石膏转化为硫酸钡和碳酸钙的保护剂。然而，由于其渗透性差，在实际应用中，BW的性能远远不能令人满意。为此，本研究利用扫描电镜附能色散x射线光谱（SEM-EDX）、x射线衍射光谱（XRD）、傅里叶变换红外光谱（FTIR）和防护性能测试，对氢氧化钡甲醇溶液（BM）作为一种新型保护剂进行了研究。结果表明，BM具有良好的渗透性，其基本原理在于其在空气和石膏基质中具有优异的稳定性。经BM和水的顺序处理后，石膏石灰砂浆的防护性能是理想的，包括增强耐候性、提高强度、保持外观等。因此，BM在建筑遗址中遭受石膏化破坏的钙质物体的保护中具有广阔的应用前景。

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引用次数: 0

Effect of desert sand content on road performance of geopolymer stabilized desert sand pavement base 砂粒含量对地聚合物稳定砂粒路面基层路用性能的影响

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

Construction and Building Materials

Pub Date : 2025-12-15 DOI: 10.1016/j.conbuildmat.2025.144844

Chao Cui , Pengxia Li , Jinming Hu , Lan Wang , Hui Peng

Traditional Portland cement-stabilized bases are extensively applied in pavement structures; however, cement production and the extraction of natural river sand are associated with significant environmental impacts and resource depletion. This study employed desert sand as fine aggregate and alkali-activated slag-fly ash waste as the binder to systematically investigate the mechanical performance and freeze-thaw durability of geopolymer stabilized desert sand (GDS) bases at high desert sand contents. Experimental results indicate that ultrafine particles in desert sand participate in geopolymerization under alkaline activation, enhancing the interfacial bonding between the geopolymer matrix and desert sand, thereby surpassing the adhesion achieved in Portland cement-desert sand systems. With increasing desert sand content, the geopolymer binder content decreases, reducing its coating and cementation effect on sand particles, while porosity increases, resulting in declines in unconfined compressive strength, compressive resilient modulus, splitting tensile strength, and flexural strength. Even at a desert sand content of 90 %, the corresponding values of these properties remained 12.03 MPa, 1034.00 MPa, 0.93 MPa, and 4.50 MPa, respectively, satisfying base layer requirements. After 60 freeze-thaw cycles, the relative dynamic modulus of elasticity remained approximately 60 %, indicating substantial freeze-thaw durability. Compared with cement stabilized desert sand (PDS) bases, GDS bases exhibited a 30–73 % reduction in carbon emissions, demonstrating pronounced environmental benefits. This study provides a theoretical foundation for the high-value utilization of industrial solid wastes and desert sand in sustainable pavement base materials.

传统的波特兰水泥稳定基层在路面结构中应用广泛；然而，水泥生产和天然河砂的开采与重大的环境影响和资源枯竭有关。本研究以沙漠砂为细骨料，碱活性矿渣-粉煤灰为粘结剂，系统研究了高含量沙漠砂条件下地聚合物稳定沙漠砂（GDS）基的力学性能和冻融耐久性。实验结果表明，在碱性活化下，沙漠砂中的超细颗粒参与了地聚合物的聚合，增强了地聚合物基质与沙漠砂之间的界面结合，从而超越了波特兰水泥-沙漠砂体系的粘附性。随着沙漠含砂量的增加，地聚合物粘结剂含量减少，其对砂粒的包覆和胶结作用减弱，孔隙度增加，导致无侧限抗压强度、抗压弹性模量、劈裂抗拉强度和抗弯强度下降。即使在沙漠含砂量为90% %时，这些特性的对应值分别为12.03 MPa、1034.00 MPa、0.93 MPa和4.50 MPa，满足基层要求。经过60次冻融循环后，相对动态弹性模量保持在60 %左右，表明具有较强的冻融耐久性。与水泥稳定的沙漠砂（PDS）基地相比，GDS基地的碳排放量减少了30-73 %，显示出明显的环境效益。本研究为工业固体废弃物和沙漠沙土在可持续路面基材中的高价值利用提供了理论基础。

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引用次数: 0

Effects of basalt fiber morphology on the crack resistance and damage behavior of warm-mix recycled asphalt mixtures 玄武岩纤维形态对温拌再生沥青混合料抗裂性能及损伤性能的影响

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

Construction and Building Materials

Pub Date : 2025-12-15 DOI: 10.1016/j.conbuildmat.2025.144782

Chao Li , Yu Zhang , Lan Wang , Zehua Tian , Mingming Zhao , Zhimin Li

Basalt fibers can significantly enhance the crack resistance of warm-mix recycled asphalt mixtures (WRAM). However, the impact of their morphology on crack resistance and damage behavior still lacks systematic comparison. This study comparatively investigates the differences in crack resistance and damage behavior of WRAM with flocculent basalt fibers (FBF) and chopped basalt fibers (CBF). Based on the edge-notch disc bending test, the impact of fiber morphology on crack resistance was evaluated using parameters such as bending index, peak load, and fracture energy. Combined with digital image correlation (DIC) technology, the strain and strain energy density changes during microcrack initiation, development, and macrocrack propagation were tracked to assess the effect of fiber morphology on external damage. Acoustic emission (AE) technology was used to analyze the changes in internal damage ring-down counts and RA-AF distribution during the external damage phase to evaluate the impact of fiber morphology on internal damage. A correlation between DIC and AE results was established to achieve a quantitative mapping of external and internal damage. Scanning electron microscopy was used to reveal the crack resistance mechanism of the fibers. The results show that FBF enhances pre-crack strength and toughness by increasing the energy threshold and the proportion of internal shear damage during the microcrack development stage. This mechanism arises from the three-dimensional network structure formed, which effectively disperses stress and inhibits microcrack development. CBF enhances post-crack toughness by increasing the energy threshold and the proportion of internal shear damage during the macrocrack propagation stage. The mechanism primarily involves fiber pullout and fracture, redistributing stress and inducing the complexity of crack path curvature. A quantitative mapping relationship between internal and external damage (R² > 0.98) was established to reveal the regulatory mechanism of fiber morphology on the multi-scale damage evolution behavior in WRAM.

玄武岩纤维能显著提高温拌再生沥青混合料的抗裂性能。然而，它们的形态对抗裂性能和损伤行为的影响还缺乏系统的比较。对比研究了絮凝玄武岩纤维（FBF）和短切玄武岩纤维（CBF） WRAM的抗裂性能和损伤性能差异。基于边缘缺口圆盘弯曲试验，利用弯曲指数、峰值载荷和断裂能等参数评估纤维形态对抗裂性能的影响。结合数字图像相关（DIC）技术，跟踪微裂纹萌生、发展和大裂纹扩展过程中应变和应变能密度的变化，评估纤维形态对外部损伤的影响。利用声发射（AE）技术分析了外损伤阶段内损伤衰响数和RA-AF分布的变化，以评价纤维形态对内损伤的影响。建立DIC和AE结果之间的相关性，以实现外部和内部损伤的定量映射。利用扫描电镜分析了纤维的抗裂机理。结果表明：FBF通过提高微裂纹发展阶段的能量阈值和内剪切损伤比例来提高预裂强度和韧性；这种机制源于形成的三维网状结构，有效地分散应力，抑制微裂纹的发展。CBF通过提高大裂纹扩展阶段的能量阈值和内剪切损伤比例来提高裂纹后韧性。其机理主要涉及纤维的拉拔断裂、应力的重新分布和裂纹路径曲率的复杂性。建立了内外损伤的定量映射关系（R²> 0.98），揭示了纤维形态对WRAM多尺度损伤演化行为的调控机制。

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引用次数: 0

Analyzing key parameters influencing carbonation-induced chloride ion redistribution in desalinated sea sand concretes 影响脱盐海砂混凝土碳致氯离子重分布的关键参数分析

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

Construction and Building Materials

Pub Date : 2025-12-15 DOI: 10.1016/j.conbuildmat.2025.144786

Yaocheng Wang , Yongkang Wang , Zhixin Zhang , Yu Chen , Xin Wang , Hongzhi Cui , Wujian Long , Zhuolin Luo

Carbonation-induced chloride ion (Cl^-) redistribution significantly accelerates steel corrosion and shortens the service life of reinforced concrete structures in marine environments. While controlling chloride transport parameters is essential to mitigate this degradation, their relative importance remains unclear. This study employs a validated carbonation-chloride coupled transport model to quantitatively assess parameter influence weights, identifying three dominant factors: saturation (78 %) as the most critical, porosity (47 %) of secondary importance, and pH (27 %) with weaker influence. These results establish saturation control as the priority strategy, while emphasizing the need for abalanced approach integrating moisture management, pore refinement, and pH maintenance. This study presents the first quantitative parameter hierarchy for carbonation-chloride coupling effects and identifies a saturation level of approximately 0.5 as a critical threshold, beyond which the Cl^- redistribution effect significantly diminishes, providing evidence-based optimization guideline for the design of durable marine concrete structures.

在海洋环境中，碳化引起的氯离子（Cl-）重分布显著加速了钢材的腐蚀，缩短了钢筋混凝土结构的使用寿命。虽然控制氯离子传输参数对减轻这种降解至关重要，但它们的相对重要性尚不清楚。本研究采用经过验证的碳-氯耦合输运模型定量评估参数影响权重，确定了三个主导因素：饱和度（78 %）是最关键的，孔隙度（47 %）次之，pH（27 %）影响较弱。这些结果确定了饱和度控制是优先策略，同时强调需要平衡方法，将水分管理、孔隙细化和pH维持结合起来。本研究首次提出了碳氯耦合效应的定量参数层次，并确定了约0.5的饱和水平为临界阈值，超过该阈值Cl-再分布效应显著减弱，为海洋耐久混凝土结构的设计提供了基于证据的优化指导。

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引用次数: 0

Effect of biochar on the shrinkage deformation of ground granulated blast-furnace slag-cement mortars 生物炭对粉状高炉渣水泥砂浆收缩变形的影响

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

Construction and Building Materials

Pub Date : 2025-12-15 DOI: 10.1016/j.conbuildmat.2025.144734

Xuqun Lin , Quang Dieu Nguyen , Arnaud Castel , Vivian W.Y. Tam

This study was conducted to comprehensively analyse the potential role of different biochar as shrinkage-reducing agent for ground granulated blast-furnace slag-cement composites, including bamboo biochar (BB), waste wood biochar (WB), and rice husk biochar (RHB). Samples with 2 wt% BB (CBB2) exhibited the highest cement hydration, improving the 28-day compressive and flexural strength by 14.6 % and 7.7 % respectively. Due to its filler effects and internal curing, a 28-day shrinkage reduction of 16.8 % was found in CBB2 group when compared to the control. Meanwhile CBB2 achieved the lowest mass loss in dry environment exposure and apparent porosity at 28 days, exhibiting the highest electrical resistivity among all mortar groups. When the biochar dosage increased to 5 wt%, less improvement of the mechanical and durability properties was found. TG/DTG results indicated that CBB2 group had the highest content of bound water and portlandite, showing the effectiveness of fine BB in promoting cement hydration. Overall, this study recommended that up to 5 wt% fine-size biochar could be safely used as shrinkage-reducing agent in GGBF-cement composites.

本研究综合分析了不同生物炭作为粉状高炉炉渣水泥复合材料减水剂的潜在作用，包括竹材生物炭（BB）、废木材生物炭（WB）和稻壳生物炭（RHB）。含2 wt% BB （CBB2）的水泥水化效果最好，其28天抗压和抗弯强度分别提高14.6% %和7.7 %。由于其填充作用和内部固化，与对照组相比，CBB2组28天的收缩率降低了16.8 %。CBB2砂浆在干燥环境下的质量损失最小，28 d时的表观孔隙率最低，电阻率最高。当生物炭添加量增加到5 wt%时，其力学性能和耐久性能的改善不大。TG/DTG结果表明，CBB2组结合水和硅酸盐含量最高，说明细BB促进水泥水化的有效性。总的来说，本研究建议高达5 wt%的细粒径生物炭可以安全地用作ggbf -水泥复合材料的减水剂。

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