Construction and Building Materials最新文献_第6页

The impact of iron tailings on the properties and microstructure of mortar under coupled freeze-thaw and sulfate attack environments

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-04-22 DOI: 10.1016/j.conbuildmat.2025.141430

Haocheng Lai , Na Li , Wei Wang , Jingyi Lin , Ping Jiang , Erlu Wu , Liang Jia

The construction industry extensively consumes river sand (RS), and its over-exploitation has led to significant environmental and economic challenges, which have become global issues. Therefore, there is an urgent need to find alternatives to RS. In this study, river sand was partially replaced with iron tailings (IOT) at varying substitution rates (0 %, 25 %, 50 %, 75 %, and 100 %). The mix ratios for the iron tailings-modified mortar (IOTM) were designed to account for the different water absorption rates of IOT and RS. The basic properties of IOTM and its durability under combined freeze-thaw and sulfate (FT-S) attack conditions were subsequently investigated. Microscopic characterization of IOTM was performed using Mercury Intrusion Porosimetry, X-ray Diffraction, and Scanning Electron Microscopy. The results indicated that: (1) The consistency of IOTM after adjusting the mix ratio was in the range of 70–90 mm, which was in accordance with the design specification. The specimen with 50 % IOT substitution rate (IOT50) had the best impermeability and mechanical properties. (2) Compared to the specimen with 0 % IOT substitution rate (IOT0), IOT50 showed less appearance damage, mass loss, and strength loss under FT-S coupling environment. With the number of cycles increased, the degree of destruction and the rate of destruction of the specimens increased significantly. (3) Under the FT-S coupling environment, gypsum and ettringite are generated within the IOTM, leading to the development of pores and cracks. IOT50 has the best pore distribution, hydration reaction and densification at different IOT substitution rates. This study provides valuable insights into the mix ratio design of IOTM and its potential application in bank protection structures in regions with hot summers and cold winters.

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引用次数: 0

Seismic strengthening of RC bridge piers using UHPC jacket and high-strength steel wire mesh: Experimental investigation and numerical simulation

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-04-22 DOI: 10.1016/j.conbuildmat.2025.141369

Liang Ren , Zhuang Zhao , Cheng Wu , Yanzhu Liao , Zhichong Que

To enhance the seismic performance of reinforced concrete (RC) bridge piers (e.g., those with early design limitations, construction defects, or long-term degradation), this study proposes a strengthening method combining Ultra-High Performance Concrete (UHPC) jackets with high-strength steel wire mesh (HSWM) in plastic hinge zones. Quasi-static tests were conducted on five UHPC-HSWM strengthened piers and one control pier to evaluate seismic performance metrics, including failure modes, hysteresis behavior, displacement ductility, energy dissipation, and stiffness degradation. The effects of the HSWM arrangement, thickness and height of the UHPC jacket on the seismic performance of bridge piers were studied. The experimental results show that the combination of HSWM and UHPC not only improves the restraint effect of the UHPC jacket but also fully leverages the fracture toughness of the UHPC material, resulting in fuller hysteresis curves. When the thickness and height of the UHPC jacket were 50 mm and 450 mm, respectively, the displacement ductility coefficient and overall energy dissipation capability of the strengthened specimens were increased by 31 % and 245 %, respectively, compared with the control specimen. The K value in the Concrete02 model was adjusted in the OpenSees to account for the enhancement roles of steel fibers and HSWM in UHPC. A finite element model on seismic performance of RC piers strengthened with HSWM-reinforced UHPC jacket was developed and validated against experimental hysteresis data.

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引用次数: 0

Enhancing antistatic property of epoxy resin coatings via formation of conductive networks with fibrous polyaniline/reduced graphene oxide

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-04-22 DOI: 10.1016/j.conbuildmat.2025.141191

Tiantian Ping, Xiaodong Pan, Erjun Tang, Miao Yuan, Xuteng Xing, Xiaomeng Chu, Shaojie Liu, Huafan Li, Jie Cui

A highly antistatic coating was fabricated by intercalating conducting polyaniline (PANI) into graphene oxide (GO) layers, which were then incorporated into epoxy resin to enhance its antistatic properties. PANI nanofibers were produced via in situ polymerization within the GO interlayers, which facilitated the separation of GO layers, improved the dispersion of functionalized GO in the epoxy resin matrix, and resulted in enhanced antistatic behavior. Further, high-shear mixing prevented the formation of large particles and agglomerates of PANI, promoting the polymerization of aniline into fibrous structures. The results of FT-IR, SEM and TEM indicate that fibrous PANI was successfully grafted onto the rGO backbone, forming an interconnected conductive network that enhances electron mobility and charge dissipation within the resin. The appropriate antistatic and mechanical properties were realized by adjusting the concentrations of PANI and rGO, and the effectiveness and durability of the composite were assessed. When the PANI/rGO content was 7 wt%, the composite material maintained a surface resistivity of

6.59 \times 1 0^{6} Ω

under standard testing conditions, as measured using a three-point probe method immediately after curing. After prolonged use, the resistivity increased and eventually stabilized at approximately

2.01 \times 1 0^{7} Ω

, conforming to industry standards. This study lays the foundation for future exploration into the long-term stability and industrial scalability of high-performance antistatic composites.

通过将导电聚苯胺（PANI）插层到氧化石墨烯（GO）层中，制造出了一种高抗静电涂层，然后将其融入环氧树脂中以增强其抗静电性能。PANI 纳米纤维是通过在 GO 夹层内原位聚合产生的，这有利于 GO 层的分离，改善了功能化 GO 在环氧树脂基体中的分散性，并增强了抗静电性能。此外，高剪切混合可防止 PANI 形成大颗粒和团聚体，促进苯胺聚合成纤维结构。傅立叶变换红外光谱、扫描电镜和电子显微镜的研究结果表明，纤维状 PANI 成功接枝到了 rGO 骨架上，形成了相互连接的导电网络，增强了树脂内部的电子迁移率和电荷耗散。通过调整 PANI 和 rGO 的浓度，实现了适当的抗静电和机械性能，并对复合材料的有效性和耐久性进行了评估。当 PANI/rGO 含量为 7 wt% 时，在标准测试条件下，复合材料的表面电阻率保持在 6.59×106Ω 的水平。长时间使用后，电阻率有所上升，最终稳定在约 2.01×107Ω 的水平，符合行业标准。这项研究为今后探索高性能抗静电复合材料的长期稳定性和工业可扩展性奠定了基础。

{"title":"Enhancing antistatic property of epoxy resin coatings via formation of conductive networks with fibrous polyaniline/reduced graphene oxide","authors":"Tiantian Ping, Xiaodong Pan, Erjun Tang, Miao Yuan, Xuteng Xing, Xiaomeng Chu, Shaojie Liu, Huafan Li, Jie Cui","doi":"10.1016/j.conbuildmat.2025.141191","DOIUrl":"10.1016/j.conbuildmat.2025.141191","url":null,"abstract":"<div><div>A highly antistatic coating was fabricated by intercalating conducting polyaniline (PANI) into graphene oxide (GO) layers, which were then incorporated into epoxy resin to enhance its antistatic properties. PANI nanofibers were produced via in situ polymerization within the GO interlayers, which facilitated the separation of GO layers, improved the dispersion of functionalized GO in the epoxy resin matrix, and resulted in enhanced antistatic behavior. Further, high-shear mixing prevented the formation of large particles and agglomerates of PANI, promoting the polymerization of aniline into fibrous structures. The results of FT-IR, SEM and TEM indicate that fibrous PANI was successfully grafted onto the rGO backbone, forming an interconnected conductive network that enhances electron mobility and charge dissipation within the resin. The appropriate antistatic and mechanical properties were realized by adjusting the concentrations of PANI and rGO, and the effectiveness and durability of the composite were assessed. When the PANI/rGO content was 7 wt%, the composite material maintained a surface resistivity of <span><math><mrow><mn>6</mn><mo>.</mo><mn>59</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>6</mn></mrow></msup><mspace></mspace><mi>Ω</mi></mrow></math></span> under standard testing conditions, as measured using a three-point probe method immediately after curing. After prolonged use, the resistivity increased and eventually stabilized at approximately <span><math><mrow><mn>2</mn><mo>.</mo><mn>01</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>7</mn></mrow></msup><mspace></mspace><mi>Ω</mi></mrow></math></span>, conforming to industry standards. This study lays the foundation for future exploration into the long-term stability and industrial scalability of high-performance antistatic composites.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"478 ","pages":"Article 141191"},"PeriodicalIF":7.4,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143860145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evolution of chloride binding and mechanical behavior in metakaolin-based geopolymer: Role of MgO-induced phase changes

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-04-21 DOI: 10.1016/j.conbuildmat.2025.141424

Gonghui Gu , Tao Ma , Rusheng Qian , Hailong Ye , Lin Wan-Wendner , Chuanqing Fu

This work investigated the evolution patterns of amorphous phase and Mg-Al LDH crystals within MgO-modified metakaolin-based geopolymer (MMG) material from the perspectives of lattice structure interactions and chemical state evolution of oxygen atoms. Based on this, the role of MgO-induced phase changes in the chloride binding behavior and mechanical performance of MMG is revealed, thereby providing theoretical guidance for the design and application of geopolymer composites in marine environments. Results show that an increased LDH/amorphous phase ratio improves the chloride binding capacity of MMG material through the interlayer anion exchange and surface adsorption of Mg-Al LDH. Moreover, increasing LDH/amorphous phase ratio also contributes to the mechanical behavior of MMG via nano-nucleation, filling effect and Si-O-Mg bond formation. However, when this ratio surpasses 0.219, the pore structure development caused by the weakened binding effect of NASH gel becomes the dominant factor affecting the mechanical behavior, leading to a gradual decline in the compressive strength as the ratio increases. At an LDH/amorphous phase ratio of 0.306, MMG material achieves an optimal balance, exhibiting both excellent mechanical performance and chloride binding behavior.

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引用次数: 0

Treatment and activation effects on kaolinite-based earth concrete

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-04-21 DOI: 10.1016/j.conbuildmat.2025.141380

Mojtaba Kohandelnia , Maroua Zerzouri , Ammar Yahia , Kamal H. Khayat

Self-consolidating earth concrete (SCEC) addresses the long construction process of conventional earthen constructions and their structural limitations, while further efforts are needed to enhance its sustainability. This study explores the development of a kaolinite-based self-consolidating earth paste (SCEP) due to their blended powder system, incorporating raw and treated (calcined and ground-calcined) kaolinite under various activation techniques, such as water hydration, sodium hexametaphosphate (NaHMP), and sodium hydroxide (NaOH) activation. The synergistic effect of calcination and mechanosynthesis on rheological, mechanical, structural, and microstructural properties of SCEP were investigated. Mechanically treated kaolinite increased yield stress, plastic viscosity, storage modulus evolution, and build-up index, while delayed the strength development compared to the calcined kaolinite samples. Among the investigated activators, NaOH resulted in more promising structural build-up, storage modulus, and compressive strength development. These findings were elaborated with X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), calorimetry, thermogravimetric analysis (TGA), and scanning electron microscopy (SEM).

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引用次数: 0

Water vapor absorption of Polyvinyl Butyral (PVB) interlayer for laminated glass

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-04-21 DOI: 10.1016/j.conbuildmat.2025.141325

Yujia Lu , Wei Liao , Suwen Chen

The absorption of water vapor from external environments into the Polyvinyl Butyral (PVB) interlayer is a significant cause of humidity aging, property degradation, reliability problems, and safety concerns in laminated glass. Existing literature reports inconsistent estimates regarding the material’s sorption and diffusivity properties, as well as the effects of humidity and temperature. Therefore, this work aims to explore the rules and mechanisms of how external factors affect water vapor absorption properties. Dynamic vapor sorption tests were conducted at various temperatures ranging from 25 to 65 °C and humidity levels from 0 % to 95 % relative humidity (RH). The results indicate that the water vapor absorption in the PVB interlayer is closely related to the polymer network via the hydrolysis of the hydroxyl groups and the formation of water clusters in the region rich in vinyl alcohol, which would, in turn, negatively impact the interlayer network. A notable finding is the estimated mean size of water clusters, ranging from 1 to approximately 2.1, across humidity levels from 5 % RH to 95 % RH. This leads to a dependence of diffusivity on water content. To account for this, an additional term was added to the Arrhenius equation to include the effect of water content. Predictive models for sorption and diffusivity have been developed and validated using existing literature on commercial PVB interlayers. The findings are expected to enhance understanding and prediction of the degradation of interlayers and laminated glazing exposed to long-term humidity aging.

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引用次数: 0

A cost-effective strategy to construct highly effective flame-retardant coatings of modified epoxy resin/layered double hydroxide/zinc borate for polystyrene foam

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-04-21 DOI: 10.1016/j.conbuildmat.2025.141324

Bin Li , Chuanshen Wang , Yifu Xiang , Wei Zhang , Bin Yu , Jinzhang Jia , Meihua Lian

The flammability of expanded polystyrene (EPS) foams severely limits their range of applications. Although several methods have been used to improve their flame-retardant properties, there is still a lack of an efficient and cost-effective strategy to ensure their fire safety. In this work, utilizing water-based polyurethane modified epoxy resin (WEPU), layered double hydroxide (LDH) and zinc borate (ZnB) as raw materials, a highly efficient flame-retardant coating was constructed on the surface of EPS to improve its mechanical properties, flame retardancy and smoke suppression capabilities. The application of a flame-retardant coating (LDH: ZnB = 1:3) increased the compressive strength of the original EPS by 68.33 %, increased the char yield from 0.14 % to 46.43 %, increased the oxygen index to 38.8 %, enabled the vertical flame test to reach the UL-94 V-0 level, reduced the peak heat release rate by 53.02 %, reduced the peak smoke production rate by 61.45 %, and the coating exhibited excellent adhesion and water resistance. The evolution characteristics of molecular number, system potential energy, and product distribution during the combustion process of WEPU/LDH/ZnB coatings were obtained through molecular simulation. Furthermore, the synergistic flame-retardant mechanism between the condensed and gas phases of these coatings was elucidated at the microscopic level.

发泡聚苯乙烯（EPS）泡沫塑料的易燃性严重限制了其应用范围。尽管人们已采用多种方法来改善其阻燃性能，但仍缺乏一种高效、经济的策略来确保其防火安全。本研究以水性聚氨酯改性环氧树脂（WEPU）、层状双氢氧化物（LDH）和硼酸锌（ZnB）为原料，在发泡聚苯乙烯表面构建了一种高效阻燃涂层，以改善其机械性能、阻燃性能和抑烟能力。阻燃涂层（LDH: ZnB = 1:3）的应用使原 EPS 的抗压强度提高了 68.33%，产炭量从 0.14% 提高到 46.43%，氧指数提高到 38.8%，垂直燃烧测试达到 UL-94 V-0 级别，峰值放热率降低了 53.02%，峰值产烟率降低了 61.45%，涂层具有优异的附着力和耐水性。通过分子模拟获得了 WEPU/LDH/ZnB 涂层燃烧过程中分子数、体系势能和产物分布的演变特征。此外，还从微观层面阐明了这些涂层的凝聚相和气相之间的协同阻燃机理。

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引用次数: 0

Development, optimisation and performance prediction of a novel cement-based materials for borehole sealing

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-04-21 DOI: 10.1016/j.conbuildmat.2025.141404

Xinglei Pan , Yang Wang , Dezhong Kong , Yanjiao Li , Zhanbo Cheng , Gaofeng Song , Yujun Zuo

Achieving high-quality borehole sealing is critical for effective gas extraction, yet conventional cement-based materials often suffer from shrinkage-induced cracking, poor fluidity, and insufficient adaptability to fractured formations. This study presents the development and multi-level optimization of a novel high-performance cement-based sealing material, using Portland cement as the matrix and incorporating polycarboxylate superplasticizer, calcium sulphoaluminate expansion agent, and sodium gluconate retarder. A comprehensive methodology was employed that single-factor experiments initially identified the influence of individual components on fluidity, expansibility, and compressive strength, while orthogonal design combined with response surface analysis (RSA) enabled multivariable optimization of admixture dosages. In addition, a backpropagation (BP) neural network based on the Levenberg-Marquardt algorithm was constructed to predict material performance across varying formulations. The integrated experimental–computational framework led to the identification of optimal parameters with the water-cement ratio of 0.8, superplasticizer at 0.7 %, expansion agent at 3 %, and retarder at 0.07 %. The BP neural network accurately predicted fluidity, expansion, and strength with average errors of 6.396 %, 3.794 %, and 4.042 %, respectively. This innovative approach not only enhances material performance but also establishes a predictive foundation for designing application-specific sealing materials, offering a practical and adaptable solution for improving borehole sealing reliability in complex geological conditions.

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引用次数: 0

Study on the thermal regulation performance of steel slag ultra-thin wearing courses combined with phase change materials: Towards green and low-carbon applications

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-04-21 DOI: 10.1016/j.conbuildmat.2025.141426

Yan Hao , Liqun Hu , Gaoli Cheng , Feng Ma , Xinye Jiang , Jiasheng Dai , Zhiyang Xing , Meng Jia

As urban heat island effects intensify, the advancement of green and low-carbon technologies in road construction has become a key priority in urban development. This study focuses on enhancing the thermal management performance of steel slag ultra-thin wearing courses by evaluating the suitability of composite phase change materials (CPCM), including stearic acid/adipic acid/sebacic acid (SAS) and stearic acid/myristic acid (SM), for incorporation into high-viscosity asphalt (HVA). A series of laboratory experiments were conducted by preparing high-viscosity modified asphalts with varying CPCM contents. The tests included analyses of thermophysical properties, chemical structure, and rheological characteristics. Additionally, the cooling behavior of the composite pavement was characterized. Furthermore, the cooling effects of CPCM on both the steel slag ultra-thin wearing course and the underlying pavement structure were analyzed. The findings indicate that CPCM improved the temperature regulation capability of HVA, reducing the heating rate and lowering peak temperatures by 0.5–1.5 ℃. CPCM enhanced the elastic response, energy storage capacity, and low-temperature performance of HVA, while reducing temperature sensitivity. Moreover, strain recovery at low strain levels improved. Temperature regulation experiments showed that incorporating 15 % SAS and SM reduced the surface temperature of the steel slag ultra-thin wearing course by 4.78 ℃ and 7.03 ℃, respectively, significantly decreasing the internal temperature gradient of the composite pavement structure. In conclusion, the composite phase change materials SAS and SM exhibited excellent potential for application in steel slag ultra-thin wearing courses, providing effective cooling and delayed thermal response characteristics.

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引用次数: 0

Self-healing and flexural performance of SMA fiber-reinforced ECC under freeze-thaw and chloride salt exposure

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-04-21 DOI: 10.1016/j.conbuildmat.2025.141344

Muhammad Umar, Hui Qian, Muhammad Faizan Ali, Shi Yifei, Ali Raza, Aneel Manan

This research explores the innovative resilience and self-healing properties of engineered cementitious composites (ECC) reinforced with shape memory alloy (SMA) fibers, tailored for environments susceptible to salt-induced freeze-thaw damage from deicing salts, seawater, and saline soils. The study examines ECC composites enhanced with varying SMA fiber volumes 0 %, 0.5 %, 0.75 %, and 1 % and three fiber shapes linear, indented, and hook-shaped, with an additional sandblasting surface treatment. Systematic analyses of monotonic and cyclic flexural behavior, as well as self-healing efficacy, were performed across four distinct freeze-thaw cycles (0, 50, 100, and 150) within environments of fresh water and a 3.5 % NaCl solution. Digital Image Correlation (DIC) was employed to precisely monitor the self-healing performance. The results highlight substantial enhancements in SMA-ECC, particularly improved flexural strength by up to 35 %, 30 %, and 17 % for hook, indented, and linear fibers respectively in freshwater. These gains were slightly reduced under saltwater conditions to 32 %, 26 %, and 15 % respectively. Additionally, crack-closure efficiencies in significant self-healing with improvements of 45 %, 38 %, and 27 % for hook, indented, and linear fibers respectively. The Weibull probability distribution model was used to establish the damage evolution equation of the SMA-ECC in two freeze-thaw environments. The results of this study can serve as a reference for the development of freeze-thaw-resistant designs for SMA-ECC structures in future applications.

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引用次数: 0