Case Studies in Construction Materials最新文献

Evaluating glass powder substitution for 3D printed concrete: Effects on thermal properties and embodied carbon 评估玻璃粉替代3D打印混凝土：对热性能和隐含碳的影响

IF 6.6 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Case Studies in Construction Materials

Pub Date : 2026-01-10 DOI: 10.1016/j.cscm.2026.e05786

Amardeep Singh , Jingting Sun , Deng Qi , Md Jaynul Abden , Yi Yi Zhou , Zhenhua Duan , Vivian W.Y. Tam

The construction industry faces increasing pressure to reduce its environmental footprint through improved materials and construction practices. This study investigates the use of ultra-fine glass powder (UFGP) as a partial cement replacement in reactive powder concrete (RPC) for 3D-printed concrete (3DPC), focusing on thermal performance and embodied carbon reduction. Six mix designs with UFGP replacement levels up to 25 % were evaluated. Experimental results show that substituting 5 % of cement with UFGP reduces thermal conductivity by 10.9 %, enhancing the material’s insulation capacity. EnergyPlus simulations for a residential building in Shanghai indicate a potential annual energy savings of 2.6 MJ/m² (4.85 %) with 5 % UFGP-enhanced concrete, arising from the synergistic effects of reduced thermal conductivity and increased thermal mass. Although the high binder content (1000 kg/m³) remains a limitation of current 3DPC technology, partial cement replacement with UFGP presents a viable strategy for lowering embodied carbon while improving thermal performance. These results demonstrate the potential of UFGP to advance next-generation sustainable construction by enhancing energy efficiency and reducing embodied carbon in 3D-printed concrete applications. However, further investigation is needed to validate performance across a wider range of environmental and structural conditions.

建筑业面临着越来越大的压力，需要通过改进材料和施工实践来减少对环境的影响。本研究探讨了超细玻璃粉（UFGP）作为3d打印混凝土（3DPC）的活性粉末混凝土（RPC）的部分水泥替代品的使用，重点关注热性能和碳减排。对UFGP替代水平高达25% %的6种混合设计进行了评估。试验结果表明，用UFGP代替5 %的水泥，可使材料的导热系数降低10.9 %，提高材料的保温能力。EnergyPlus对上海一座住宅建筑的模拟表明，使用5 %的uffp增强混凝土，由于导热系数降低和热质量增加的协同效应，每年可能节省2.6 MJ/m²（4.85 %）的能源。尽管高粘结剂含量（1000 kg/m3）仍然是当前3DPC技术的局限性，但用UFGP替代部分水泥是一种可行的策略，可以在降低碳含量的同时改善热性能。这些结果证明了UFGP通过提高能源效率和减少3d打印混凝土应用中的隐含碳来推进下一代可持续建筑的潜力。然而，需要进一步的研究来验证在更广泛的环境和结构条件下的性能。

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引用次数: 0

Enhancing the toughness and low-temperature performance of epoxy asphalt via PTMG-MDI modified epoxy resin 通过pmmg - mdi改性环氧树脂提高环氧沥青的韧性和低温性能

IF 6.6 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Case Studies in Construction Materials

Pub Date : 2026-01-09 DOI: 10.1016/j.cscm.2026.e05785

Yitong Hou , Qiqi Zhan , Xinqiang Zhang , Bailin Shan , Liming Yang , Pan Liu , Yanan Cui

Epoxy asphalt is widely applied in steel bridge deck paving due to its high strength and thermal stability. However, the thermosetting epoxy resin becomes highly brittle after curing, resulting in insufficient toughness and poor low-temperature crack resistance. To address this issue, a novel high-toughness epoxy asphalt (HTEA) was developed by grafting polytetramethylene ether glycol-diphenylmethane diisocyanate (PTMG-MDI), serving as polyurethane flexible segments, onto epoxy resin and incorporating it into asphalt. The cured high-toughness epoxy resin (HTER) exhibited good thermal stability and mechanical properties, with a tensile strength of 4.05 MPa and an elongation at break of 143 %. HTEA showed slightly reduced tensile strength but significantly increased elongation at break. Rheological tests indicated that the retention time of HTEA reached up to 37 min. The storage modulus decreased in the low-temperature region, while the high-temperature creep compliance changes only slightly, indicating improved creep recovery performance. The fracture morphologies of HTER and HTEA exhibits ductile characteristics. The PTMG-MDI increases the density of cross-linking points in the three-dimensional network, thereby improving the low-temperature crack resistance of epoxy asphalt. When the HTER content is 40 % the glass transition temperature of HTEA is as low as −28.7℃, and the testing temperature is −24℃, the maximum creep modulus reaches 492 MPa, with a minimum creep rate of 0.242, indicating excellent low-temperature performance.

环氧沥青因其强度高、热稳定性好而广泛应用于钢桥面铺装。但热固性环氧树脂固化后变脆，韧性不足，耐低温开裂性差。为了解决这一问题，将聚四亚甲基醚乙二醇二苯基甲烷二异氰酸酯（PTMG-MDI）作为聚氨酯柔性段接枝到环氧树脂上，并将其掺入沥青中，开发出一种新型高韧性环氧沥青（HTEA）。固化后的高韧性环氧树脂（HTER）具有良好的热稳定性和力学性能，抗拉强度为4.05 MPa，断裂伸长率为143 %。HTEA的抗拉强度略有降低，但断裂伸长率显著提高。流变试验表明，HTEA的滞留时间可达37 min。低温区存储模量降低，而高温蠕变柔度变化不大，表明蠕变恢复性能有所提高。HTER和HTEA的断裂形貌表现出延性特征。pmmg - mdi增加了三维网络中交联点的密度，从而提高了环氧沥青的低温抗裂性。当HTER含量为40 %时，HTEA的玻璃化转变温度低至−28.7℃，试验温度为−24℃，最大蠕变模量达到492 MPa，最小蠕变速率为0.242，低温性能优良。

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引用次数: 0

"Rigid-Flexible" interpenetrating network: Performance regulation & multi-scale mechanism of lignin – Polyurethane composite asphalt “刚-柔”互穿网络：木质素-聚氨酯复合沥青的性能调控及多尺度机理

IF 6.6 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Case Studies in Construction Materials

Pub Date : 2026-01-08 DOI: 10.1016/j.cscm.2026.e05772

Wang Pan , Hongxin Guan , Jie Deng , Hairong Yang

Traditional polyurethane-modified road asphalt (PU-RA) relies on fossil resources and has high costs, and bio-based materials provide a new path for its green development. This study prepared lignin-polyurethane modified road asphalt (LPU-RA) using sodium lignosulfonate (LS) as a bio-based alternative component, aimed at clarifying how LS regulates LPU-RA performance and its core mechanism. FTIR, FM and AFM were used to characterize chemical structure and micromorphology, combined with molecular dynamics (MD) simulation to analyze intermolecular interactions. The results show that LPU-RA achieves optimal comprehensive performance when LS replaces 10 % polyols, with its core properties including high/low-temperature resistance and rutting resistance significantly improved compared with PU-RA. LS’s rigid benzene rings covalently bond with polyurethane (PU) flexible chains via urethane bonds, forming a "rigid-flexible" interpenetrating network to inhibit microphase separation. MD simulation confirms that PU/LS group enrichment improves surface free energy, and hydrogen bonds between LS and asphaltenes strengthen molecular binding, jointly optimizing performance. The clarified "bio-based component-microstructure-macro-performance" mechanism and optimal LS ratio provide theoretical support for directional design of bio-based modified asphalt.

传统聚氨酯改性道路沥青（PU-RA）依赖化石资源，成本高，生物基材料为其绿色发展提供了新的途径。本研究以木质素磺酸钠（LS）作为生物基替代组分制备木质素-聚氨酯改性道路沥青（LPU-RA），旨在阐明LS调控LPU-RA性能的机理及其核心机制。利用FTIR、FM和AFM表征化学结构和微观形貌，结合分子动力学（MD）模拟分析分子间相互作用。结果表明，LPU-RA在LS替代10% %多元醇时，综合性能达到最佳，其耐高低温、抗车辙等核心性能较PU-RA有显著提高。LS的刚性苯环通过聚氨酯键与聚氨酯（PU）柔性链共价结合，形成“刚柔”互穿网络，抑制微相分离。MD模拟证实，PU/LS基团的富集提高了表面自由能，LS与沥青质的氢键加强了分子结合，共同优化了性能。明确了“生物基组分-微观结构-宏观性能”机理和最佳LS比，为生物基改性沥青的定向设计提供了理论支持。

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引用次数: 0

Experimental investigation of HPMC inhibited crack sensitive of coral mud under extreme environmental conditions HPMC在极端环境条件下抑制珊瑚泥裂纹敏感性的实验研究

IF 6.6 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Case Studies in Construction Materials

Pub Date : 2026-01-08 DOI: 10.1016/j.cscm.2026.e05762

Hong Wang , Chunyan Wang , Jinqiao Zhao , Zhenhua Ren , Xuanming Ding

Coral mud, widely distributed in the South China Sea, is highly prone to cracking, posing challenges for engineering applications. Hydroxypropyl methyl cellulose (HPMC), with superior water retention and crack inhibition capacity under hot and humid conditions, was introduced to improve the crack resistance of coral mud. This study conducted cracking and tensile tests to evaluate the effects of HPMC dosage (four levels) and environmental conditions on the cracking behavior and mechanical properties of coral mud. Results show that temperature and humidity markedly regulate water evaporation, with high temperature significantly accelerating moisture loss. HPMC effectively enhanced water retention and delayed cracking, with a 0.25 % dosage providing the optimal performance. It restricted crack length and refined crack width distribution while having little influence on crack orientation. The modification efficacy was strongly dependent on environmental conditions, showing the most significant improvement under high temperature and high humidity, where a 0.25 % dosage markedly enhanced crack resistance. Tensile tests confirmed that HPMC enhanced interparticle bonding and force transfer, particularly under high water content, whereas the effect was limited under low water content. This paper discussed the dual mechanism of HPMC to suppress cracking in coral mud by regulating evaporation and enhancing cohesion based on experimental results. Its findings provide practical guidelines for dosage and condition-specific application, supporting sustainable infrastructure development in the South China Sea.

南海广泛分布的珊瑚泥极易开裂，给工程应用带来了挑战。采用羟丙基甲基纤维素（HPMC）提高珊瑚泥的抗裂性能，使其在湿热条件下具有良好的保水性和抗裂能力。本研究通过开裂和拉伸试验，评价HPMC掺量（4级）和环境条件对珊瑚泥开裂行为和力学性能的影响。结果表明，温度和湿度对水分蒸发有显著调节作用，高温显著加速水分损失。HPMC有效地提高了保水性，延缓了开裂，0.25 %的投加量提供了最佳的性能。它限制了裂纹长度，细化了裂纹宽度分布，但对裂纹方向影响不大。改性效果与环境条件密切相关，在高温高湿条件下改性效果最为显著，0.25 %的掺量显著增强了材料的抗裂性。拉伸试验证实，HPMC增强了颗粒间的结合和力传递，特别是在高含水量下，而在低含水量下效果有限。根据实验结果，探讨了HPMC通过调节蒸发和增强粘聚力抑制珊瑚泥开裂的双重机理。其研究结果为剂量和特定条件的应用提供了实用指南，支持南海基础设施的可持续发展。

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引用次数: 0

Impact of lime kiln dust on the mechanical properties and freeze-thaw durability of nanoclay-stabilized kaolin soil 石灰窑粉尘对纳米粘土稳定高岭土力学性能和冻融耐久性的影响

IF 6.6 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Case Studies in Construction Materials

Pub Date : 2026-01-07 DOI: 10.1016/j.cscm.2026.e05774

Maryam Majd Rahimabadi , Mahyar Arabani

Stabilization of clayey soils using traditional stabilizers such as lime and cement raises significant environmental concerns. Recent studies have shown that despite the strength limitations of nanoclay (NC) and the slow rate of pozzolanic reactions associated with lime kiln dust (LKD) in soil stabilization, these materials exhibit promising performance as environmentally friendly stabilizers. This study investigates the combined effects of NC and LKD with the aim of overcoming these limitations and improving the mechanical behavior and durability of kaolin soil. Laboratory testing included mechanical and durability tests supported by microstructural analyses. The results indicate that the addition of LKD to NC-treated soil resulted in an approximately tenfold increase in both unconfined compressive strength and indirect tensile strength. These improvements are attributed to pore filling by NC and the occurrence of pozzolanic reactions induced by LKD, leading to the formation of C–S–H and C–A–H gels. Mechanical strength increased with curing time due to the gradual completion of pozzolanic and hydration reactions. Furthermore, the stabilizers improved durability and CBR values, reduced the required pavement thickness by 65.7 %, and resulted in significant cost savings in highway construction. In addition, compared with cement and lime, the use of these additives reduced CO₂ emissions by approximately threefold and decreased energy consumption by more than tenfold.

使用石灰和水泥等传统稳定剂稳定粘土引起了严重的环境问题。最近的研究表明，尽管纳米粘土（NC）的强度有限，并且与石灰窑粉尘（LKD）相关的火山灰反应速度缓慢，但这些材料作为环境友好型稳定剂表现出很好的性能。为了克服这些限制，提高高岭土的力学性能和耐久性，本研究探讨了NC和LKD的联合作用。实验室测试包括由微观结构分析支持的机械和耐久性测试。结果表明，添加LKD后，nc处理土的无侧限抗压强度和间接抗拉强度均提高了约10倍。这些改善是由于NC填充孔隙和LKD诱导的火山灰反应的发生，导致C-S-H和C-A-H凝胶的形成。由于火山灰反应和水化反应的逐渐完成，机械强度随固化时间的延长而增加。此外，稳定剂提高了耐久性和CBR值，将所需的路面厚度减少了65.7% %，从而显著节省了公路建设成本。此外，与水泥和石灰相比，这些添加剂的使用减少了大约三倍的二氧化碳排放量，减少了十倍以上的能源消耗。

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引用次数: 0

Revealing fly ash induced cement hydration retardation: The application of embedded integrated sensing element and coda wave analysis 揭示粉煤灰诱导水泥水化迟滞：嵌入式集成传感元件与尾波分析的应用

IF 6.6 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Case Studies in Construction Materials

Pub Date : 2026-01-07 DOI: 10.1016/j.cscm.2025.e05747

Yuanxing Wang , Weiwei Xu , Ming Sun , Pingfeng Li , Shijie Wang , Weijian Ding , Lei Qin , Yu Liang , Yu Wang

Fly ash (FA) is a common supplementary cementitious material and it delays early cement hydration. This study applies a novel integrated sensing element (ISE) to monitor cement hydration and to characterize the influence of FA. The results show that signals evolve with hydration. Amplitude shows an early decrease followed by recovery. Energy exhibits a rapid drop and then a gradual increase, and the time to reach the minimum energy is delayed by 9.36 %, 14.61 %, 19.10 %, 22.85 %, and 33.08 % for 5 %, 10 %, 15 %, and 20 % FA compared with 0 % FA. The dominant frequency band remains within 140–170 kHz, while the peak magnitude in the frequency domain evolves more slowly as FA content increases. The coda wave is sensitive to microstructural development and shows slower evolution with higher FA, which indicates inhibition of early hydration. Coda wave analysis at multiple times confirms this slowdown. Setting time tests show reductions of 4 %, 9 %, 14 %, 22 %, and 28 % in the initial setting time, and wave velocity measurements show decreases in shear (1018–862 m/s) and longitudinal (2175–2012 m/s) velocities with increasing FA. These consistent results demonstrate the feasibility of ISE for in situ detection of hydration retardation in cementitious materials that contain FA.

粉煤灰是一种常见的补充胶凝材料，它会延缓水泥的早期水化。本研究采用一种新型集成传感元件（ISE）来监测水泥水化并表征FA的影响。结果表明，信号随水合作用的变化而变化。振幅显示早期下降，随后恢复。能源展览迅速下降,然后逐渐增加,和时间达到最小能量是推迟了9.36 % 14.61 % 19.10 %, % 22.85和33.08 % 5 %,10 % 20 15 %,% FA与0 %。主导频带保持在140 ~ 170 kHz范围内，而随着FA含量的增加，频域峰值幅度的变化更慢。尾波对微结构发育较为敏感，且随着FA的升高，尾波演化较慢，说明早期水化受到抑制。多次尾波分析证实了这种减速。凝结时间试验表明，初始凝结时间降低了4 %、9 %、14 %、22 %和28 %，波速测量表明，随着FA的增加，剪切速度（1018-862 m/s）和纵向速度（2175-2012 m/s）降低。这些一致的结果证明了ISE在含有FA的胶凝材料中原位检测水化延迟的可行性。

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引用次数: 0

Enhancing early strength of cement mortar using MSWI fly ash under accelerated carbonation curing MSWI粉煤灰在加速碳化养护条件下提高水泥砂浆的早期强度

IF 6.6 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Case Studies in Construction Materials

Pub Date : 2026-01-07 DOI: 10.1016/j.cscm.2026.e05779

Minseok Nam , Yunsu Lee , Jeado Han , Dongkyu Lee , Sungwon Jung , Myung-Sun Baek , Dongcheon Park , Kwangwoo Wi

Metallic Al in municipal solid waste incineration fly ash (MSWIFA) generates hydrogen gas in cement mortars, creating internal pores that typically reduce mechanical strength and necessitate pretreatment before use. This study aims to utilize these gas-induced pores as diffusion pathways for CO₂ during carbonation curing to maximize its effectiveness in cement mortars. Cement paste and mortar specimens were prepared by replacing cement with 2.5, 5, and 10 wt% of untreated MSWIFA. Their physical and chemical properties were evaluated through flowability, calorimetry, compressive strength, porosity, water absorption, Fourier-transform infrared spectroscopy, thermogravimetric-differential thermal analysis, and inductively coupled plasma tests. The chlorides in MSWIFA accelerated cement hydration but reduced flowability owing to increased viscosity. Although gas-induced pores reduced strength, they facilitated CO₂ penetration, which contributed to strength improvement through densification. Notably, the sample with 5 % MSWIFA (AFA5) showed the highest compressive strength after carbonation. In all specimens, Ca(OH)₂ and C-S-H transformed into CaCO₃, with AFA5 forming more metastable CaCO₃. Heavy metals such as Cu, Zn, and Pb were effectively immobilized by hydration products, while Cr leaching slightly increased owing to electrostatic repulsion. Carbonation resulted in a slight increase in heavy metal leaching; however, all values remained below the regulatory limits established by the United States Environmental Protection Agency, confirming the environmental safety.

城市固体垃圾焚烧飞灰（MSWIFA）中的金属铝在水泥砂浆中产生氢气，形成内部孔隙，通常会降低机械强度，需要在使用前进行预处理。本研究旨在利用这些气致孔隙作为CO₂在碳化养护过程中的扩散途径，使其在水泥砂浆中的效果最大化。用2.5、5和10 wt%未处理的MSWIFA代替水泥制备水泥浆和砂浆试件。通过流动性、量热法、抗压强度、孔隙率、吸水性、傅里叶变换红外光谱、热重-差热分析和电感耦合等离子体测试来评估它们的物理和化学性质。MSWIFA中的氯化物加速了水泥的水化，但由于粘度增加而降低了流动性。虽然气致孔隙降低了强度，但它们促进了二氧化碳的渗透，从而通过致密化提高了强度。值得注意的是，含5 % MSWIFA （AFA5）的样品碳化后抗压强度最高。在所有标本中，Ca(OH)2和C-S-H转化为CaCO3， AFA5形成更亚稳的CaCO3。水化产物对Cu、Zn、Pb等重金属具有有效的固定化作用，而Cr的浸出则因静电排斥作用而略有增加。碳化导致重金属浸出量略有增加；然而，所有数值均低于美国环境保护署规定的管制限值，证实了环境安全。

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引用次数: 0

Sustainable production of lightweight geopolymer from mixed fly ash: Effects of alkali activators and surfactants 混合粉煤灰可持续生产轻质地聚合物：碱活化剂和表面活性剂的影响

IF 6.6 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Case Studies in Construction Materials

Pub Date : 2026-01-07 DOI: 10.1016/j.cscm.2026.e05777

Onanong Arjariya , Suratsawadee Kungsanant , Tanan Chub-uppakarn , Sumate Chaiprapat

Upcycling fly ash is a key challenge in supporting the circular energy production of biomass power plants. Using a mixture of palm ash (PA) and rubberwood ash (RA) in the production of lightweight geopolymer offers an innovative pathway for converting industrial waste into a valuable construction material. The study demonstrates that up to 40 % of mixed PA and RA can be utilized for metakaolin (MK) replacement in lightweight geopolymer production. The geopolymer formulation was examined at various mass ratios of MK:PA:RA using sodium hydroxide or potassium hydroxide combined with sodium silicate as alkaline activators. The suitable formulation was further applied for lightweight geopolymer production, comparing two types of surfactants—anionic and nonionic surfactants. Combining anionic and nonionic surfactants at a mass ratio of 1:3 resulted in a more stable foam than using a single surfactant alone. The formulated lightweight geopolymer has a density of 1544 kg/m³ , a compressive strength of 5.41 MPa, and a water absorption rate of 23.61 % by weight, meeting the standard for lightweight non-load-bearing concrete, with a dry density below 1680 kg/m³ and an average net-area compressive strength above 4.14 MPa, as specified in ASTM C129. Its thermal conductivity was 0.741 W/m·K, making it suitable for thermal insulation.

粉煤灰的升级回收是支持生物质发电厂循环能源生产的关键挑战。使用棕榈灰（PA）和橡胶木灰（RA）的混合物生产轻质地聚合物为将工业废物转化为有价值的建筑材料提供了一种创新途径。研究表明，在轻质地聚合物生产中，高达40% %的混合PA和RA可用于替代偏高岭土（MK）。以氢氧化钠或氢氧化钾与水玻璃复合作为碱性活化剂，考察了MK:PA:RA在不同质量比下的地聚合物配方。将合适的配方进一步应用于轻质地聚合物的生产，比较了阴离子表面活性剂和非离子表面活性剂两种类型。阴离子表面活性剂和非离子表面活性剂以1:3的质量比结合使用，比单独使用单一表面活性剂产生更稳定的泡沫。配制的轻质地聚合物的密度为1544 kg/m³ ，抗压强度为5.41 MPa，按重量计吸水率为23.61 %，符合ASTM C129规定的轻质非承重混凝土标准，干密度低于1680 kg/m³ ，平均净面积抗压强度高于4.14 MPa。其导热系数为0.741 W/m·K，适用于保温材料。

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引用次数: 0

Composite rejuvenator strategy for optimizing the performance of RAP-recycled asphalt mixtures 优化rap -再生沥青混合料性能的复合再生剂策略

IF 6.6 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Case Studies in Construction Materials

Pub Date : 2026-01-06 DOI: 10.1016/j.cscm.2026.e05773

Zeng Guodong , Guo Yuchen , Li Hao , Liu Mingyan , Fang Yang , Wang Xuancang , Tian Yuan

Asphalt pavement recycling is increasingly recognized as an effective strategy for resource conservation and carbon reduction. This study investigates the deterioration characteristics of aged asphalt and develops a composite rejuvenator composed of bio-oil and DOTP plasticizer to restore binder performance and enhance the pavement properties of RAP-recycled asphalt mixtures. Response surface methodology was used to optimize rejuvenator dosage, after which recycled mixtures with RAP contents of 15 %, 30 %, 45 %, and 60 % were fabricated. Binder tests, high- and low-temperature rheological evaluations, rutting tests, moisture stability tests, freeze-thaw splitting, and semicircular bending (SCB) tests were conducted to assess rejuvenation effectiveness. The optimized formulation (M2: 3 % bio-oil + 2.5 % DOTP) achieved a 93 % recovery rate of binder properties and exhibited rheological behavior most comparable to virgin asphalt, showing improved high-temperature stability, enhanced low-temperature relaxation, and increased mixture fracture energy. Grey relational analysis revealed that RAP content exerted the greatest influence on stiffness-related indicators and negatively affected crack resistance, with 30 % RAP achieving the best balance among performance metrics. Overall, the bio-oil - DOTP composite rejuvenator effectively improved the high-temperature, low-temperature, and moisture-resistant performance of RAP-recycled asphalt mixtures, providing a practical pathway for promoting sustainable asphalt recycling.

沥青路面回收利用作为一种节约资源、减少碳排放的有效策略，越来越受到人们的重视。研究了老化沥青的劣化特性，研制了由生物油和DOTP增塑剂组成的复合再生剂，以恢复rap -再生沥青混合料的粘结剂性能，提高其路用性能。采用响应面法优化回春剂用量，制备RAP含量分别为15 %、30 %、45 %和60 %的回春剂。通过粘合剂试验、高温和低温流变学评价、车辙试验、水分稳定性试验、冻融劈裂和半圆弯曲（SCB）试验来评估回复性效果。优化后的配方（M2: 3 %生物油+ 2.5 % DOTP）获得了93 %的粘结剂性能回收率，并表现出与原始沥青最相似的流变行为，表现出更好的高温稳定性，增强的低温弛豫，增加了混合料的断裂能。灰色关联分析表明，RAP含量对刚度相关指标的影响最大，对抗裂性能的影响为负，其中30% % RAP在性能指标之间达到最佳平衡。总体而言，生物油- DOTP复合再生剂有效提高了rap再生沥青混合料的高温、低温、耐湿性能，为促进沥青可持续再生提供了一条切实可行的途径。

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引用次数: 0

Effect of Sugarcane Bagasse Ash on the sustainable performance of hot-mix asphalt: A case study of experimental and numerical analysis 蔗渣灰对热拌沥青可持续性能的影响：实验与数值分析的案例研究

IF 6.6 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Case Studies in Construction Materials

Pub Date : 2026-01-06 DOI: 10.1016/j.cscm.2026.e05769

Udeme Udo Imoh , Adeyemi Oluwaseun Adeboje , Ebunlomo Ruth Adekola , Rauf Hassan , Majid Movahedi Rad

The growing demand for sustainable road infrastructure has intensified the interest in alternative mineral fillers that reduce natural resource consumption and environmental impacts. This study investigates the use of Sugarcane Bagasse Ash (SBA), an abundant agricultural by-product in sub-Saharan Africa, as a partial replacement for conventional mineral fillers in hot-mix asphalt (HMA). Unlike previous studies that considered SBA primarily as a minor additive, this study provides a systematic evaluation across a wide replacement range (0–16 %), combined with experimental testing and numerical validation. Marshall and indirect tensile strength (ITS) tests were conducted on HMA mixtures produced using locally sourced Nigerian aggregates and 60/70 penetration-grade bitumen. A three-dimensional finite element model (FEM) of the ITS configuration was developed to corroborate the experimental response and identify stress concentration zones. results indicate that SBA improves both mechanical and volumetric performance within an optimal replacement range of 6–10 %, with peak performance of approximately 8 % SBA. Within this range, Marshall stability increased from 7.6 kN to 9.0 kN, the Marshall quotient reached 3.3 kN/mm, bulk density increased to 2.51 g/cm³, and air voids decreased from 4.9 % to 3.5 %, remaining within standard design limits. Microstructural analyses confirmed the predominance of amorphous silica and porous SBA morphology, which promoted enhanced filler–binder interactions and mixture densification. FEM predictions of peak tensile stress agreed with laboratory ITS results within 10 % and successfully reproduced observed crack initiation zones. Excessive SBA content (> 10 %) led to reduced stability and density owing to over-filling effects. The findings demonstrate that 6–10 % SBA is a technically viable and sustainable filler replacement for HMA, particularly in sugarcane-producing regions, offering improved performance alongside waste valorization and reduced reliance on quarry-derived fillers.

对可持续道路基础设施日益增长的需求，加强了人们对减少自然资源消耗和环境影响的替代矿物填充物的兴趣。本研究调查了甘蔗渣灰（SBA）的使用，这是撒哈拉以南非洲地区丰富的农业副产品，作为热混合沥青（HMA）中传统矿物填料的部分替代品。与以往将SBA主要视为次要添加剂的研究不同，本研究提供了广泛替代范围（0-16 %）的系统评估，并结合实验测试和数值验证。马歇尔和间接拉伸强度（ITS）测试对使用当地采购的尼日利亚骨料和60/70渗透级沥青生产的HMA混合物进行了测试。建立了ITS结构的三维有限元模型，以验证试验响应并识别应力集中区。结果表明，SBA在6-10 %的最佳替换范围内提高了机械性能和体积性能，峰值性能约为8 % SBA。在此范围内，马歇尔稳定性从7.6 kN增加到9.0 kN，马歇尔商达到3.3 kN/mm，容重增加到2.51 g/cm³，空气率从4.9 %下降到3.5 %，保持在标准设计限值内。微观结构分析证实了无定形二氧化硅和多孔SBA形态的优势，这促进了填料-粘结剂相互作用和混合物致密化的增强。FEM预测的峰值拉应力与实验室ITS结果在10 %内一致，并成功地再现了观察到的裂纹起裂区。过量的SBA含量（> 10 %）由于过度填充效应导致稳定性和密度降低。研究结果表明，6-10 %的SBA在技术上是一种可行的、可持续的HMA填料替代品，特别是在甘蔗产区，它可以提高性能，同时减少对采石场衍生填料的依赖。

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