Construction and Building Materials最新文献_第3页

Seismic design of FRP grid and bar strengthened RC columns via multi-objective optimization and decision analysis 基于多目标优化和决策分析的FRP格筋钢筋混凝土柱抗震设计

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

Construction and Building Materials

Pub Date : 2026-04-11 Epub Date: 2026-03-12 DOI: 10.1016/j.conbuildmat.2026.145826

Dengfeng Lu , Xin Wang , Zhen Sun , Lining Ding , Jian Ding , Jialin Liu , Zhiyuan Chen , Zhishen Wu

Seismic retrofit of reinforced concrete (RC) columns is essential for structural safety during earthquakes. However, using fiber-reinforced polymer (FRP) grids and embedded FRP bars makes it difficult to achieve high ductility, low residual drift, and acceptable cost simultaneously. This study develops a multi-objective optimization framework that couples a calibrated fiber-based finite element (FE) model with the Multi-Objective Evolutionary Algorithm based on Decomposition (MOEA/D) to maximize ductility and minimize residual drift ratio (RDR) and material cost. The FE model is validated against cyclic tests on FRP-strengthened RC columns, and the framework produces well-distributed Pareto fronts within 60 generations. An energy-based regression model relates RDR to the hysteretic energy dissipation ratio and residual slip and crack components, identifying the energy dissipation ratio as the dominant factor. Under a design-level seismic loading, Pareto-optimal results show that engineered cementitious composite (ECC) jackets with basalt-FRP (BFRP) grids increase ductility by 26.4%, whereas carbon-FRP (CFRP) grid-and-bar systems reduce residual drift by up to 32.1% relative to a reference FRP grid-polymer cement mortar (PCM) retrofit. Low-cost BFRP grid-PCM schemes still provide moderate ductility and stable hysteretic responses. The proposed framework clarifies quantitative trade-offs among ductility, residual drift, and cost, and offers engineering guidance for designing efficient, performance-based seismic retrofit strategies for existing RC columns.

钢筋混凝土柱的抗震加固是保证结构抗震安全的关键。然而，使用纤维增强聚合物（FRP）网格和嵌入式FRP条很难同时实现高延展性，低残余漂移和可接受的成本。本研究开发了一个多目标优化框架，将校准后的基于纤维的有限元（FE）模型与基于分解的多目标进化算法（MOEA/D）相结合，以最大化延性，最小化残余漂移比（RDR）和材料成本。有限元模型对frp加固RC柱的循环试验进行了验证，框架在60代内产生了均匀分布的帕累托前沿。基于能量的回归模型将RDR与滞回能量耗散比和残余滑裂分量联系起来，认为能量耗散比是主导因素。在设计级地震荷载下，帕累托最优结果表明，与参考FRP格栅-聚合物水泥砂浆（PCM）改造相比，带有玄武岩-FRP （BFRP）格栅的工程胶凝复合材料（ECC）护套的延性提高了26.4%，而碳-FRP （CFRP）格栅-杆系统的残余位移减少了32.1%。低成本的BFRP网格- pcm方案仍然提供适度的延性和稳定的滞后响应。提出的框架明确了延性、残余漂移和成本之间的定量权衡，并为现有RC柱设计高效、基于性能的抗震改造策略提供了工程指导。

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引用次数: 0

Green activation of tea-stalk biochar for sustainable suppression of asphalt fume emissions via multi-mechanism adsorption 茶秆生物炭的绿色活化多机理吸附可持续抑制沥青烟尘排放

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

Construction and Building Materials

Pub Date : 2026-04-11 Epub Date: 2026-03-11 DOI: 10.1016/j.conbuildmat.2026.145897

Hao Duan , Sanpeng Mao , Quantao Liu , Zhenyu Zou , Shi Xu , Jianying Yu

To promote sustainable road construction and reduce harmful emissions during asphalt paving, a green bio-based adsorbent was developed by activating tea-stalk-derived biochar (TB) using phytic acid, a biodegradable plant-derived organophosphate. This activation introduced a multiple adsorption mechanism that integrates physical adsorption, chemical interactions, and catalytic transformation. The results show that phytic acid significantly increased the specific surface area and micropore volume of TB, facilitated the development of graphitic structures to enhance π–π interactions with aromatic hydrocarbons, and incorporated phosphorus-containing functional groups that enabled chemical bonding and catalytic conversion. At only 0.5% dosage, the activated biochar (PTB) achieved a 64.2% reduction in VOCs and a 93.1% for H₂S, both exceeding the higher dosage of 2% TB (58.6% and 85.4%, respectively). GC-MS results confirmed that, under the influence of multiple adsorption mechanisms, PTB exhibited higher suppression efficiency across all categories of asphalt fume components, particularly for highly hazardous compounds such as benzene derivatives, alkenes, thiophenes, and ketones. This biochar-based approach offers a sustainable pathway for reducing asphalt-related air pollution during road construction, thereby supporting cleaner transport infrastructure and contributing to improved urban air quality.

为了促进可持续道路建设和减少沥青铺装过程中的有害排放，研究了一种绿色生物基吸附剂，该吸附剂是用植酸（一种可生物降解的植物来源的有机磷酸盐）激活茶茎衍生的生物炭（TB）。这种活化引入了一种集物理吸附、化学相互作用和催化转化为一体的多重吸附机制。结果表明，植酸显著增加了TB的比表面积和微孔体积，促进了石墨结构的发展，增强了与芳烃的π -π相互作用，并引入了含磷官能团，实现了化学键和催化转化。在0.5%的添加量下，活性生物炭（PTB）的挥发性有机化合物（VOCs）和硫化氢（H2S）分别减少了64.2%和93.1%，均超过了2%的添加量（分别为58.6%和85.4%）。GC-MS结果证实，在多种吸附机制的影响下，PTB对所有类别的沥青烟成分都表现出更高的抑制效率，特别是对苯衍生物、烯烃、噻吩和酮类等高度有害化合物。这种基于生物炭的方法为减少道路建设过程中与沥青相关的空气污染提供了可持续的途径，从而支持更清洁的交通基础设施，并有助于改善城市空气质量。

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引用次数: 0

Investigation of volume expansion and inhibiting method for steel slag by mean of calcium chelating: Performance characterization and mechanisms 钙螯合对钢渣体积膨胀及抑制方法的研究：性能表征及机理

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

Construction and Building Materials

Pub Date : 2026-04-11 Epub Date: 2026-03-09 DOI: 10.1016/j.conbuildmat.2026.145871

Shibo Zhang , Jun Xie , Shaopeng Wu , Menglin Li , Derun Zhang , Fusong Wang

The hydration of free calcium oxide (f-CaO) leads to poor volume stability of steel slag, which cause cracking and performance degradation in pavement. This study explores innovative method by chelating Ca²⁺ to achieve volume stability of steel slag. The effects of chelating agents on the volume expansion, performance and its mechanisms for volume inhibition were investigated. The results show that the four chelating agents exhibit distinct efficiencies in chelating Ca²⁺. As polymeric chelators, polyacrylic acid (PAA) and polyepoxysuccinic acid (PESA) demonstrate superior chelation capacity compared to phosphate-based agents such as sodium hexametaphosphate (SHMP) and sodium pyrophosphate (TSPP) due to their multidentate structure. This enhanced chelation thereby significantly reduces the f-CaO content in steel slag. Analysis of microstructure and properties revealed that the precipitates formed by the reaction of chelating agents with Ca²⁺ fill the pores of steel slag, reducing its water absorption and porosity, and enhancing the steel slag's resistance to crushing and abrasion. Among them, steel slag modified with PAA and PESA exhibits more excellent volume stability and mechanical properties, with water absorption rates reduced to 1.073% and 1.055% respectively. The water immersion expansion rate of the asphalt mixtures prepared from it is less than 1%, which fully meets the requirements of road engineering. It is found that chelating agents undergo ion exchange with Ca²⁺ liberated from f-CaO hydration, efficiently forming stable precipitates or amorphous chelates instead of crystalized Ca(OH)₂. This process promotes f-CaO dissolution and diffusion, thereby effectively inhibiting volumetric expansion in steel slag induced by delayed hydration of residual f-CaO.

游离氧化钙（f-CaO）的水化作用导致钢渣体积稳定性差，导致路面开裂和性能下降。本研究探索了通过螯合Ca 2 +实现钢渣体积稳定性的创新方法。研究了螯合剂对其体积膨胀、性能的影响及其体积抑制机理。结果表明，四种螯合剂对Ca 2 +的螯合效果不同。作为聚合螯合剂，聚丙烯酸（PAA）和聚氧琥珀酸（PESA）由于其多齿结构，与六偏磷酸钠（SHMP）和焦磷酸钠（TSPP）等磷酸盐基螯合剂相比，表现出优越的螯合能力。这种增强的螯合作用从而显著降低了钢渣中f-CaO的含量。微观结构和性能分析表明，螯合剂与Ca 2 +反应形成的沉淀物填充了钢渣的孔隙，降低了钢渣的吸水率和孔隙率，增强了钢渣的抗破碎性和耐磨性。其中，经PAA和PESA改性的钢渣表现出更优异的体积稳定性和力学性能，吸水率分别降至1.073%和1.055%。由其配制的沥青混合料的水浸膨胀率小于1%，完全满足道路工程的要求。发现螯合剂与f-CaO水化释放的Ca 2 +发生离子交换，有效地形成稳定的沉淀物或无定形螯合剂，而不是结晶的Ca(OH) 2。这一过程促进了f-CaO的溶解和扩散，从而有效抑制了残余f-CaO延迟水化引起的钢渣体积膨胀。

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引用次数: 0

Ductility and hydration mechanisms of innovative engineered/strain-hardening cementitious composites (ECC/SHCC) incorporating solid-waste-derived binder 结合固体废物衍生粘合剂的新型工程/应变硬化胶凝复合材料（ECC/SHCC）的延性和水化机制

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

Construction and Building Materials

Pub Date : 2026-04-11 Epub Date: 2026-03-09 DOI: 10.1016/j.conbuildmat.2026.145843

Zihao Song , Haoliang Wu , Rui Chen , Weipeng Chen , Xiaoyan Huang , Victor C. Li

For decarbonized and durable infrastructure, Engineered Cementitious Composites (ECC) must maintain tight crack control and strain-hardening behavior while drastically reducing clinker content. A promising approach is the use of solid-waste-based binder systems to lower carbon dioxide emissions. This study develops a gypsum-activated ternary solid-waste-derived binder composed of steel slag, blast-furnace slag, and desulfurization gypsum for zero-clinker ECC. The coupling between hydration and ductility under different curing humidity conditions is systematically quantified. The ECC exhibits a compressive strength of 45–65 MPa at 28 days. Meanwhile, it achieves stable multiple cracking with an average crack width of 53 μm and sustains a tensile strength of up to 5.61 MPa. When the curing humidity increases to 95%, the ECC demonstrates increased compressive strength; however, its tensile ductility decreases to 1.43% at 28 days. Isothermal calorimetry, XRD, SEM/EDS, and TGA results reveal that gypsum activation synergistically accelerates the hydration of slag and steel slag, leading to the formation of C–S–H and AFt phases. These hydration products densify the matrix and enhance fiber–matrix bonding. Adequate moisture promotes AFt accumulation and suppresses carbonation, whereas low humidity retards hydration. Overall, the findings demonstrate that waste-derived binders combined with humidity-controlled curing provide a simple and scalable strategy to produce low-carbon ECC with robust crack-width control and reliable strain-hardening, thereby advancing durable infrastructure with reduced clinker demand.

对于脱碳和耐用的基础设施，工程胶凝复合材料（ECC）必须在大幅减少熟料含量的同时保持严格的裂缝控制和应变硬化行为。一种很有前景的方法是使用基于固体废物的粘合剂系统来降低二氧化碳排放。研究了一种由钢渣、高炉渣和脱硫石膏组成的石膏活化固体废物三元粘结剂，用于零熟料ECC。系统量化了不同养护湿度条件下水化与延性的耦合关系。龄期28 d， ECC的抗压强度为45 ~ 65 MPa。同时，实现了稳定的多重裂纹，平均裂纹宽度为53 μm，抗拉强度高达5.61 MPa。当养护湿度增加到95%时，ECC的抗压强度增加；28 d拉伸延展性下降至1.43%。等温量热法、XRD、SEM/EDS和TGA分析结果表明，石膏活化协同加速了矿渣和钢渣的水化，形成了C-S-H和AFt相。这些水化产物使基体致密，增强纤维与基体的结合。充足的水分促进AFt的积累和抑制碳酸化，而低湿度则阻碍水合作用。总的来说，研究结果表明，废物来源的粘合剂与湿度控制固化相结合，提供了一种简单且可扩展的策略，可以生产低碳ECC，具有强大的裂缝宽度控制和可靠的应变硬化，从而在减少熟料需求的情况下推进耐用的基础设施。

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引用次数: 0

Assessment of the fracture performance of CR-modified bituminous mixtures enhanced with a reactive polymer using SCB test and image-based crack analysis 利用SCB试验和基于图像的裂缝分析评估反应性聚合物增强cr改性沥青混合料的断裂性能

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

Construction and Building Materials

Pub Date : 2026-04-11 Epub Date: 2026-03-09 DOI: 10.1016/j.conbuildmat.2026.145839

Furkan Yıldırım , Baha Vural Kök , Abdulkadir Şengür , Ahmet Münir Özdemir

Modification of asphalt pavements with various additives has become an inevitable situation in order to resist the increasing traffic conditions and the corrosive effects of the environment for a longer period of time. In this study, the effect of the use of crumb rubber (CR) obtained from waste vehicle tyres in combination with a reactive polymer (B2Last) on fracture performance of bituminous mixtures was investigated by semicircular bending (SCB) test. The performance of CR+B2Last combinations was also compared with the widely used styrene-butadiene-styrene (SBS) modification. This study also examines fracture formation in hot mix asphalt using a U-Net-based image processing approach. It was found that B2Last used with CR realised the polyurethane reaction after short-term aging and was compatible with the bituminous mixture. 8%CR modification showed similar performance with 4% SBS modification, while the use of 2%B2Last in combination with 8%CR significantly increased the effectiveness of CR and offered much better fracture resistance than 4%SBS modification. With the U-net architecture, the crack area and propagation were successfully determined, and it was also found that there was a high correlation between these determined areas and SCB parameters.

为了更长时间地抵抗日益增加的交通条件和环境的腐蚀作用，用各种添加剂对沥青路面进行改性已成为一种必然的情况。本研究通过半圆弯曲（SCB）试验，研究了从废旧汽车轮胎中提取的橡胶屑（CR）与反应性聚合物（B2Last）结合使用对沥青混合料断裂性能的影响。并将CR+B2Last复合材料的性能与目前广泛应用的SBS改性材料进行了比较。本研究还使用基于u - net的图像处理方法检查热混合沥青中的裂缝形成。结果表明，B2Last与CR混合使用后，在短期老化后实现了聚氨酯反应，与沥青混合料的相容性较好。8%CR改性与4%SBS改性的性能相似，而2%B2Last与8%CR联合使用可显著提高CR的有效性，并且具有比4%SBS改性更好的抗断裂性。利用U-net结构，成功地确定了裂纹面积和扩展范围，并发现这些确定的面积与SCB参数之间存在较高的相关性。

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引用次数: 0

A residue-modified magnesium oxysulfate cement composite: Tailoring and efficacy for loess reinforcement 残渣改性硫酸镁水泥复合材料：黄土补强的裁剪与效果

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

Construction and Building Materials

Pub Date : 2026-04-11 Epub Date: 2026-03-11 DOI: 10.1016/j.conbuildmat.2026.145916

Qi Xu , Dongliang Chen , Shengwen Tang , Yanqin Wen , Cheng Yang , Jian Xiong , Yuan Zhou

The development of sustainable binders via valorizing industrial by-products is crucial for green geotechnical engineering. This study develops a novel titanium extraction residue (TER) modified magnesium oxysulfate cement (MOS) composite binder for the reinforcement of loess. The research first investigates the fundamental characteristics of the TER-MOS binder. The addition of TER is found to generally enhance the cohesion and durability of the MOS matrix. Microstructurally, the formation of the characteristic 5·1·7 phase (5Mg(OH)₂·MgSO₄·7 H₂O) is confirmed, alongside the generation of additional cementitious gels from TER, leading to a densified structure. In its lightweight form, the composite achieves a density of 0.523 g/cm³ and a thermal conductivity of 0.181 W/(m·K)). The focus then shifts to its engineering application, where the TER-MOS binder demonstrates exceptional efficacy in stabilizing loess. At an optimal MgO/MgSO₄ molar ratio of 10:1, the stabilized loess achieves a high 28-day compressive strength of 3.6 MPa. Most critically, it demonstrates superior durability under aggressive environmental conditions, specifically water immersion and freeze-thaw cycling. After 3 days of immersion, it retains a softening coefficient of 0.583, indicating improved water stability for a MOS-based system. Furthermore, it retains a strength of 2.6 MPa after 10 freeze-thaw cycles. This retained strength after prolonged water exposure and multiple freeze-thaw events highlights its robust durability. The stabilization mechanism is attributed to a synergistic framework of interlocking 5·1·7 crystals and TER-derived gels. This work presents a dual-value strategy that not only upcycles industrial waste but also provides a sustainable and effective technical alternative for soil stabilization and ground improvement.

利用工业副产品开发可持续的粘结剂是绿色岩土工程的关键。研制了一种新型钛萃取渣（TER）改性硫酸镁水泥（MOS）复合粘结剂，用于黄土的加固。本研究首先考察了TER-MOS粘结剂的基本特性。研究发现，TER的加入普遍增强了MOS基体的内聚性和耐久性。微观结构上，证实了特征5·1·7相（5Mg(OH)2·MgSO4·7 H2O）的形成，以及TER生成的额外胶凝凝胶，导致致密结构。在其轻量化形式下，复合材料的密度为0.523 g/cm3，导热系数为0.181 W/(m·K))。然后将重点转移到其工程应用上，其中TER-MOS粘合剂在稳定黄土方面表现出卓越的功效。在最佳MgO/MgSO4摩尔比为10:1时，稳定黄土的28天抗压强度达到3.6 MPa。最关键的是，它在恶劣的环境条件下表现出优异的耐久性，特别是在水浸和冻融循环下。浸泡3天后，其软化系数保持在0.583，表明基于mos的体系的水稳定性有所提高。经10次冻融循环后，其强度仍保持在2.6 MPa。在长时间的水暴露和多次冻融事件后，这种保留的强度突出了其坚固的耐久性。稳定机制归因于联锁的5·1·7晶体和ter衍生凝胶的协同框架。这项工作提出了一种双重价值战略，不仅使工业废物升级，而且为土壤稳定和地面改善提供了可持续和有效的技术替代方案。

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引用次数: 0

Multifunctional performance and environmental safety of pervious concrete incorporating phosphogypsum artificial aggregate: Synergistic enhancement by fly ash and steel fibers 磷石膏人工骨料透水混凝土的多功能性能和环境安全：粉煤灰和钢纤维的协同增强

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

Construction and Building Materials

Pub Date : 2026-04-11 Epub Date: 2026-03-09 DOI: 10.1016/j.conbuildmat.2026.145822

Fan Yu , Tao Fan , Jie Liu , Jiangcheng Ai

Phosphogypsum artificial aggregate (PA) is a sustainable recycled material fabricated by pelletizing industrial solid waste phosphogypsum (PG) with cementitious binders. Utilizing this PA to replace natural aggregate (NA) in pervious concrete represents a potential pathway for PG's high-value valorization and large-scale consumption. This study systematically analyzed the effects of different PA replacement rates on the pore structure, permeability, mechanical properties, multifunctional benefits (water purification, thermal regulation, sound absorption), and environmental safety of pervious concrete. To address the mechanical performance degradation caused by PA, the reinforcement effects of fly ash (FA) and steel fibers (SF) were also evaluated. The results indicated that PA did not significantly alter the total porosity but optimized pore regularity, specifically by reducing geometric complexity and forming smoother, more circular pore channels due to its spherical morphology. The low intrinsic strength and weak interfacial characteristics of PA led to reduced mechanical properties, with compressive strength dropping by 47.1% at just 25% replacement. However, the PA-based pervious concrete exhibited multiple functional advantages: its heavy metal removal efficiency peaked at 75% replacement, while its thermal regulation capacity (peak temperature reduced by 3.06°C) and sound absorption performance (average coefficient increased by 8.8%) both monotonically improved with increasing PA content. Environmental safety was confirmed as heavy metals were undetected in all specimens, P and F⁻ were effectively immobilized by the cement matrix, and SO₄²⁻ concentrations remained within safety limits. The hybrid incorporation of FA and SF demonstrated a significant synergistic strengthening effect: a combination of 15% FA and 0.4% SF increased the compressive and flexural strengths of the PA25 specimen by 79.6% and 31.5%, respectively, restoring its mechanical properties to a level approaching that of the natural aggregate concrete.

磷石膏人工骨料是将工业固体废磷石膏（PG）与胶凝结合剂成球而制成的一种可持续再生材料。利用这种PA替代天然骨料（NA）在透水混凝土中代表了PG高价值增值和大规模消费的潜在途径。本研究系统分析了不同PA替代率对透水混凝土的孔隙结构、渗透性、力学性能、多功能效益（净水、调热、吸声）和环境安全的影响。为了解决PA引起的力学性能下降问题，还对粉煤灰（FA）和钢纤维（SF）的增强效果进行了评价。结果表明，聚丙烯酸酯没有显著改变总孔隙率，但优化了孔隙的规律性，特别是通过降低几何复杂性和形成更光滑、更圆的孔道。PA的低固有强度和弱界面特性导致力学性能下降，在25%的替代下，抗压强度下降了47.1%。然而，PA基透水混凝土表现出多重功能优势：随着PA含量的增加，其重金属去除效率在置换75%时达到峰值，而其热调节能力（峰值温度降低3.06℃）和吸声性能（平均系数提高8.8%）均单调提高。环境安全得到了证实，因为所有样本中都没有检测到重金属，P和F毒血症被水泥基质有效地固定住了，硫酸钾²毒血症的浓度保持在安全范围内。FA和SF的混合掺入表现出显著的协同强化效果：15% FA和0.4% SF的混合掺入使PA25试件的抗压强度和抗弯强度分别提高了79.6%和31.5%，使其力学性能恢复到接近天然骨料混凝土的水平。

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引用次数: 0

Experimental and SEM image segmentation analysis to establish the optimum content of ferrochrome slag aggregate in lime activated high-volume GGBS-based concrete 通过实验和SEM图像分割分析，确定了铬铁渣骨料在石灰活化大体积ggbs混凝土中的最佳掺量

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

Construction and Building Materials

Pub Date : 2026-04-11 Epub Date: 2026-03-09 DOI: 10.1016/j.conbuildmat.2026.145835

Laren Satpathy , Suraj Kumar Parhi , Sanjaya Kumar Patro , Amar Nath Nayak

This study investigates the synergistic effects of lime-activated high-volume ground granulated blast-furnace slag (GGBS) binder and ferrochrome slag (FCS) coarse aggregate on the mechanical, durability, and microstructural performance of sustainable concrete. Concrete mixes incorporating 60% GGBS, 7% hydrated lime (lime), and FCS replacement levels of 50%, 75%, and 100% were evaluated through mechanical testing, durability assessment, and microstructural characterization using X-ray diffraction with Rietveld refinement, field-emission scanning electron microscopy (FE-SEM), and U-Net-based semantic segmentation of SEM images. The optimized mix containing 75% FCS achieved a comparable 28-day compressive strength of 33.8 MPa, representing a marginal increase of 3.5% over the control mix, along with similar improvements of approximately 3% in split tensile strength and 2.5% in flexural strength. However, significant durability enhancements were observed, including a reduction of 23% in water absorption and 78% in carbonation depth in addition to an improvement of 72% in acid induced strength loss and 73% in abrasion resistance. Rietveld quantification confirmed substantial portlandite consumption, enhanced calcium silicate hydrate (C-S-H) gel generation, and a higher amorphous fraction, indicating intensified pozzolanic reaction and matrix densification. The presence of stable FCS-derived spinel phases such as forsterite, enstatite, and mullite further contributed to microstructural stability. SEM image segmentation of the optimum mix quantified a 43% reduction in porosity, a 20% increase in the degree of hydration, and a significant refinement of the interfacial transition zone thickness in comparison to the control mix. Environmental assessment demonstrated nearly 38% reduction in embodied carbon and 33% cost savings with a significant improvement of 151% in efficiency index, while TCLP results confirmed effective chromium immobilization less than 0.07 mg/L. Overall, the findings establish 75% FCS replacement as an optimal strategy for producing high-performance, eco-efficient concrete and highlight the potential of industrial by-product valorization in sustainable construction.

本研究探讨了石灰活化的大量磨粒高炉渣（GGBS）粘结剂和铬铁渣（FCS）粗骨料对可持续混凝土力学性能、耐久性和微观结构性能的协同效应。混凝土混合料中含有60% GGBS、7%水合石灰（石灰）和50%、75%和100%的FCS替代水平，通过力学测试、耐久性评估、微观结构表征（使用Rietveld细化的x射线衍射、场发射扫描电镜（FE-SEM）和基于u - net的SEM图像语义分割）进行评估。含有75% FCS的优化混合物的28天抗压强度为33.8 MPa，比对照混合物略微提高3.5%，同时劈裂抗拉强度和弯曲强度也分别提高了约3%和2.5%。然而，我们观察到显著的耐久性增强，包括吸水率降低23%，碳化深度降低78%，酸致强度损失提高72%，耐磨性提高73%。Rietveld量化证实了大量的硅酸盐消耗，增强了水合硅酸钙（C-S-H）凝胶的生成，以及更高的无定形部分，表明火山灰反应和基质致密化加剧。稳定的fcs衍生尖晶石相（如橄榄石、顽辉石和莫来石）的存在进一步促进了显微结构的稳定性。通过SEM图像分割，与对照混合物相比，最佳混合物的孔隙率降低了43%，水化程度提高了20%，界面过渡区厚度也有了显著改善。环境评价结果表明，该方法可减少近38%的隐含碳，节省33%的成本，效率指数显著提高151%，而TCLP结果证实有效的铬固定小于0.07 mg/L。总体而言，研究结果表明，75%的FCS替代品是生产高性能、生态高效混凝土的最佳策略，并强调了工业副产品在可持续建筑中的潜力。

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引用次数: 0

Evaluation on wide-temperature rheological properties and compatibilization of polyphosphoric acid-modified asphalt mastic 多磷酸改性沥青胶泥的宽温流变性能及增容性能评价

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

Construction and Building Materials

Pub Date : 2026-04-11 Epub Date: 2026-03-11 DOI: 10.1016/j.conbuildmat.2026.145898

Xiang Liu , Jun Yang , Haitao Su , Jingpeng Jia , Xiaolong Li , Xianglin He

Polyphosphoric acid (PPA)-modified asphalt provides cost-effectiveness and performance advantages, making it well-suited for stone mastic asphalt (SMA) mixtures. However, the performance and interactions of the modified asphalt mastic in the mixture require further investigation. This study investigates the wide-temperature rheological properties and interactions of PPA-modified asphalt mastics with a high filler-to-binder ratio, considering asphalt source (Shell 70# and DH 70#), fiber type (lignin fibers (LF) and basalt fibers (BF)). The rheological characteristics were examined using a dynamic shear rheometer, and the interactions in the PPA-asphalt-filler-fiber system were analyzed using Cole-Cole, Han, and Van Gurp-Palmen (vGP) plots. Mechanisms of PPA and fiber interaction were explored through microscopy and infrared spectroscopy. The results showed that PPA forms a strongly modified mastic system with DH 70# (asphaltene content 20.7%). The J_nr3.2 decreases by 43.6%, indicating improvement in high-temperature performance. In contrast, Shell 70# exhibits only weak modification; its J_nr3.2 even increases by 2.7%. PPA improves the fatigue life of asphalt mastic, particularly at low-strain. BF further enhances the fatigue life across the entire-strain. However, LF exhibits a positive effect only in the strongly modified system. Meanwhile, fibers (particularly BF) reduce the low-temperature stress relaxation capacity. In addition, PPA improves the compatibility of the asphalt–filler system. However, the fibers fail to provide further benefits and instead intensify high-temperature heterogeneity in weakly modified system. Esterification reactions may occur between PPA and LF. However, PPA has reacted with the asphalt binder. As a result, system interactions are dominated by physical adsorption, ultimately leading to heterogeneous structure.

聚磷酸（PPA）改性沥青具有成本效益和性能优势，非常适合于石胶泥沥青（SMA）混合物。然而，改性沥青胶泥在混合料中的性能和相互作用需要进一步研究。考虑沥青来源（Shell 70#和DH 70#）、纤维类型（木质素纤维（LF）和玄武岩纤维（BF）），研究高填料胶比ppa改性沥青胶粘剂的宽温流变特性和相互作用。使用动态剪切流变仪检查了流变特性，并使用Cole-Cole， Han和Van Gurp-Palmen （vGP）图分析了ppa -沥青-填料-纤维体系中的相互作用。通过显微镜和红外光谱研究了PPA与纤维相互作用的机理。结果表明，PPA形成了一种DH 70#（沥青质含量20.7%）的强改性胶泥体系。Jnr3.2降低了43.6%，表明高温性能有所提高。相比之下，壳牌70#仅表现出微弱的修改；其Jnr3.2甚至上涨了2.7%。PPA提高了沥青胶泥的疲劳寿命，特别是在低应变下。BF进一步提高了整个应变的疲劳寿命。然而，LF仅在强修饰系统中表现出积极作用。同时，纤维（特别是BF）降低了低温应力松弛能力。此外，PPA还改善了沥青填料体系的相容性。然而，纤维不能提供进一步的好处，反而加剧了弱改性体系的高温非均质性。PPA和LF之间可能发生酯化反应。然而，PPA与沥青粘结剂发生了反应。因此，系统相互作用以物理吸附为主，最终导致非均相结构。

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引用次数: 0

Potential of clay-based plaster for improving thermal inertia in lightweight constructions: Analytical and experimental investigations 粘土基灰泥改善轻质建筑热惯性的潜力：分析和实验研究

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

Construction and Building Materials

Pub Date : 2026-04-11 Epub Date: 2026-03-11 DOI: 10.1016/j.conbuildmat.2026.145858

Zineb Boutayeb, Matthieu Labat, Claire Oms, Stéphane Ginestet

Lightweight, bio-based walls often suffer from low thermal inertia, leading to sensitivity to external temperature fluctuations. This study explores how clay-based plaster can enhance this behaviour through analytical and experimental investigations. The analytical approach highlights the role of internal areal heat capacity and show that increasing the effusivity and thickness of the inner plaster layer improves the wall’s dynamic thermal response. Experimental results demonstrate that applying the studied clay plaster increases the internal surface heat capacity of wood walls from 16.8 kJ·m⁻²·K⁻¹ to 60.8 kJ·m⁻²·K⁻¹, which represents about 90% of the value observed in heavier structures. These findings provide practical insights into the use of earthen coatings to enhance thermal inertia and energy performance in lightweight construction systems.

轻质的生物基墙体通常具有较低的热惯性，从而对外部温度波动敏感。本研究通过分析和实验研究探讨了粘土基石膏如何增强这种行为。分析方法强调了内面热容的作用，并表明增加内石膏层的渗透率和厚度可以改善墙体的动态热响应。实验结果表明，应用粘土石膏可使木墙的内表面热容从16.8 kJ·m−2·K−1提高到60.8 kJ·m−2·K−1，约占较重结构内表面热容的90%。这些发现为使用土涂层来增强轻质建筑系统的热惯性和能源性能提供了实际的见解。

引用次数: 0