Construction and Building Materials最新文献_第10页

Study on the workability and mechanical properties of geopolymer cementitious materials for solid waste activated by salt and alkali 盐碱活化固体废物用地聚合物胶凝材料的可加工性和力学性能研究

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

Construction and Building Materials

Pub Date : 2026-01-10 DOI: 10.1016/j.conbuildmat.2026.145213

Jiaze Li , Feihan Xie , Shunfu Chen , Shuai Pang , Henghui Fan , Xiangdong Zhang , Zengyi Wan

To facilitate the high-value, large-scale utilization of industrial solid waste, a fully solid-waste CDRG cementitious material was developed using calcium carbide residue (CCR), desulfurization gypsum (DG), red mud (RM), and granulated blast furnace slag (GBFS). Fifteen experimental groups were designed employing a controlled-variable approach. Rheological properties, setting time, and unconfined compressive strength (UCS) were measured. Microscopic techniques, including SEM, FT-IR, and TG-DTG, were employed to investigate the effects of CCR content, DG content, and the RM:GBFS ratio on the properties of the CDRG cementitious materials and to elucidate the underlying strength development mechanism. The results indicate that CDRG cementitious materials exhibit distinct shear-thinning behavior, with shear rate-shear stress curves following the Modified Bingham model. Both the yield stress and plastic viscosity increased with higher CCR content, DG content, and RM:GBFS ratio. The setting time decreases with increasing CCR content and RM-GBFS ratio, while it increases with rising DG content. The UCS gradually increases with curing age. Group A shows a “first increase, then decrease” trend in UCS with increasing CCR content, while Group B exhibits a similar trend with increasing DG content. Specimens A4 (CCR content 20 %) and B4 (DG content 8 %) showed 28-day UCS values of 10.91 MPa and 15.89 MPa, respectively. The UCS of Group C gradually decreased with increasing RM proportion, with specimen C1 (RM:GBFS ratio 30:70) achieving the highest 28-day UCS of 15.97 MPa. Microscopic analysis indicated that the primary hydration products were C-S-H gel, ettringite (AFt), and minor amounts of portlandite (Ca(OH)₂).The high-alkali environment provided by CCR promotes the dissolution of [SiO₄]^4- and [AlO₄]^5- from RM-GBFS. The SO₄^2- supplied by DG further accelerates AFt formation. C-S-H gel and AFt interlock to fill pores, collectively enhancing material density and mechanical properties. This study exemplifies the concept of "turning waste into treasure" for resource utilization, providing novel insights and methodologies for the resource recovery of industrial solid wastes.

为实现工业固体废弃物的高价值、规模化利用，以电石渣（CCR）、脱硫石膏（DG）、赤泥（RM）、粒状高炉矿渣（GBFS）为原料，研制了全固废CDRG胶凝材料。采用控制变量法设计15个实验组。流变特性，凝固时间和无侧限抗压强度（UCS）进行了测量。采用SEM、FT-IR、TG-DTG等细观技术研究了CCR含量、DG含量和RM:GBFS比对CDRG胶凝材料性能的影响，阐明了CDRG胶凝材料强度发展机制。结果表明：CDRG胶凝材料具有明显的剪切减薄特性，剪切速率-剪切应力曲线符合修正Bingham模型；随着CCR含量、DG含量和RM:GBFS比的增大，屈服应力和塑性粘度均增大。凝结时间随CCR含量和RM-GBFS比的增加而减小，随DG含量的增加而增大。随着龄期的延长，UCS逐渐增大。A组UCS随CCR含量的增加呈先升高后降低的趋势，B组UCS随DG含量的增加呈相似趋势。A4 （CCR含量为20 %）和B4 （DG含量为8 %）的28天UCS值分别为10.91 MPa和15.89 MPa。C组的UCS随着RM比例的增加逐渐降低，其中C1 (RM:GBFS比30:70)28天UCS最高，为15.97 MPa。显微分析表明，主要水化产物为C-S-H凝胶、钙矾石（AFt）和少量波特兰石（Ca(OH)2）。CCR提供的高碱环境促进了[SiO4]4-和[AlO4]5-从RM-GBFS中溶解。DG提供的SO42-进一步加速了AFt的形成。C-S-H凝胶与AFt互锁填充孔隙，共同提高材料密度和力学性能。本研究体现了“变废为宝”的资源化利用理念，为工业固体废物资源化利用提供了新的见解和方法。

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引用次数: 0

Multifactor analysis and prediction of asphalt rutting factor and temperature fatigue factor based on experiments and machine learning 基于实验和机器学习的沥青车辙因子和温度疲劳因子多因素分析与预测

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

Construction and Building Materials

Pub Date : 2026-01-10 DOI: 10.1016/j.conbuildmat.2026.145189

Tengfei Nian , Siyu Nie , Penghui Wang , Yongfeng Zhu , Zhaoli Wang

The Rutting Factor and Temperature Fatigue Factor constitute core indicators for evaluating the durability of asphalt pavements, reflecting the pavement's ability to withstand deformation at elevated temperatures and crack formation at reduced temperatures, respectively. This importance is heightened in arid and frigid regions, where asphalt pavements are susceptible to damage and cracking induced by severe temperature fluctuations, thereby significantly affecting road quality. Consequently, precise determination of the Rutting Factor and Temperature Fatigue Factor is vital for the construction and maintenance of asphalt pavements. Traditionally, these factors are derived from dynamic shear rheological experiments; however, this approach is time-intensive and entails intricate experimental procedures. In response to this challenge, the current paper proposes a novel methodology based on neural network optimization algorithms to augment data acquisition efficiency and elucidate the interrelationship between these factors. Initially, the study explores the impact of multiple variables, including angular frequency, temperature, and vibration stress, under varying freeze-thaw cycle conditions on asphalt performance. The complex shear modulus and phase angle are quantified employing a dynamic shear rheometer, enabling the calculation of the Rutting Factor and Temperature Fatigue Factor, which is subsequently followed by a thorough examination of their multifactorial interactions. Thereafter, a Back Propagation (BP) neural network model is developed using the experimental data, and the Grey Wolf Optimization (GWO) algorithm is implemented to optimize the weights and thresholds of the BP neural network. The findings reveal that the Rutting Factor and Temperature Fatigue Factor manifest intricate nonlinear variations under extreme temperature fluctuations, with substantial multifactorial interactions influencing asphalt performance. Furthermore, the optimized model exhibits remarkable predictive accuracy, offering an effective avenue for advancing the performance of asphalt pavements. Through this investigation, an innovative detection methodology is proposed to enhance the quality and durability of asphalt pavement engineering.

车辙系数和温度疲劳系数是评价沥青路面耐久性的核心指标，分别反映了沥青路面在高温下承受变形的能力和在低温下产生裂缝的能力。在干旱和寒冷地区，这种重要性更加突出，因为那里的沥青路面容易因温度剧烈波动而受损和开裂，从而严重影响道路质量。因此，车辙因子和温度疲劳因子的精确测定对沥青路面的施工和维护至关重要。传统上，这些因素是从动态剪切流变实验中得出的；然而，这种方法是费时的，需要复杂的实验程序。为了应对这一挑战，本文提出了一种基于神经网络优化算法的新方法，以提高数据采集效率并阐明这些因素之间的相互关系。首先，研究探讨了在不同冻融循环条件下，角频率、温度和振动应力等多个变量对沥青性能的影响。采用动态剪切流变仪对复杂剪切模量和相位角进行量化，从而计算车辙因子和温度疲劳因子，随后对它们的多因素相互作用进行彻底检查。在此基础上，利用实验数据建立了BP神经网络模型，并采用灰狼优化算法对BP神经网络的权值和阈值进行优化。研究结果表明，车辙因子和温度疲劳因子在极端温度波动下表现出复杂的非线性变化，存在大量的多因素相互作用对沥青性能产生影响。优化后的模型具有较好的预测精度，为提高沥青路面的使用性能提供了有效途径。通过研究，提出了一种创新的检测方法，以提高沥青路面工程的质量和耐久性。

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引用次数: 0

Research on the identification of self-burned coal gangue concrete aggregate particle size and its size effect based on the improved U2-Net model 基于改进的U2-Net模型的自燃煤矸石混凝土骨料粒径识别及其粒径效应研究

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

Construction and Building Materials

Pub Date : 2026-01-10 DOI: 10.1016/j.conbuildmat.2026.145194

Siyi He , Haiqing Liu , Dong Li , Qingyi Liu , Qi Chu , Saiyu Shao , Yitong Liu

Currently, in the two-dimensional simulation of the microstructure of concrete, the aggregates are usually simplified as circular shapes and randomly placed. In fact, the shape of the aggregate and its location have a very significant impact on the simulation results. Consequently, in this paper, the CBAM-U²-Net model is employed to segment cross-sectional images of self-combusting coal gangue aggregate concrete (SCGAC). Based on this model, a two-dimensional mesoscale model of SCGAC was established, accurately replicating the distribution pattern, grading, and shape of aggregates within SCGAC. Mesoscopic numerical simulations were carried out on SCGAC specimens with dimensions of 100 mm, 150 mm and 200 mm to analyze their failure behaviors under compressive and splitting tensile forces. In addition, the influence mechanism of aggregate particle size (10 mm, 20 mm, and 30 mm) on it was also investigated. The results demonstrate that: 1) When the specimen dimensions are held constant, the compressive and splitting tensile strengths of SCGAC tend to decrease slightly as the aggregate size increases. 2) The compressive strength and splitting tensile strength of SCGAC both demonstrate size dependent behaviors. Compared with large aggregate specimens, the failure of small aggregate specimens is more brittle, and thus their size effect is more significant. 3) The size effect behavior of the compressive and splitting tensile strengths of SCGAC is in accordance with Bažant's size effect theory, which further validates the effectiveness of the model proposed in this study.

目前，在混凝土微观结构的二维模拟中，通常将集料简化为圆形且随机放置。事实上，骨料的形状及其位置对模拟结果有非常显著的影响。因此，本文采用CBAM-U2-Net模型对自燃煤矸石骨料混凝土（SCGAC）截面图像进行分割。在此基础上，建立了SCGAC二维中尺度模型，准确再现了SCGAC内部团聚体的分布格局、级配和形态。对尺寸分别为100 mm、150 mm和200 mm的SCGAC试件进行细观数值模拟，分析其在压缩和劈裂拉力作用下的破坏行为。此外，还研究了集料粒径（10 mm、20 mm和30 mm）对其影响机理。结果表明：1)在试样尺寸一定的情况下，随着骨料尺寸的增大，SCGAC的抗压强度和劈裂抗拉强度略有降低；2) SCGAC的抗压强度和劈裂抗拉强度均表现出尺寸依赖性。与大骨料试件相比，小骨料试件破坏脆性更强，尺寸效应更显著。3) SCGAC抗压强度和劈裂抗拉强度的尺寸效应行为符合Bažant的尺寸效应理论，进一步验证了本研究模型的有效性。

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引用次数: 0

Comparative study on the performance of impurity-containing MgO expansive agent pretreated in different regimes 含杂质氧化镁膨胀剂不同预处理制度的性能比较研究

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

Construction and Building Materials

Pub Date : 2026-01-10 DOI: 10.1016/j.conbuildmat.2026.145197

Yanxu Zhai , Lei Huang , Chengyou Wu , Luyao Jin

The composition of lithium-extracted magnesium slag (MS) is complex, making it difficult to utilize industrially, which leads to its accumulation as waste. To address this issue, this study investigates the conversion of MS into an MgO expansive agent (MEA). This approach enables the consumption of 1.6–1.8 tons of MS per ton of MEA produced. Two distinct approaches were employed to address the impurities in the MEA: Method A involved washing and drying followed by high-temperature calcination (AMEA), while Method B involved high-temperature calcination followed by washing and drying (BMEA). The research systematically analyzed the variations in MEAs’ activity, hydration product, pore structure, expansion behavior, and compressive properties resulting from these different pretreatment approaches. Furthermore, the influence of the hydration and hardening processes on the expansive performance of the MEAs was investigated. The experimental results indicate that the specimens containing AMEA achieved a 28-day compressive strength of only 73.1–77.3 % of the control group. Notably, the AMEA specimen MAS9 exhibited excessive expansion after 120 days. Different impurity processing methods resulted in variations in MgO crystal size and reactivity. In contrast, specimens containing BMEA demonstrated a stable increase in expansion throughout the curing period, with a 28-day compressive strength reaching 80.1–81.64 % of the control group.

锂提镁渣成分复杂，难以实现工业利用，导致其作为废弃物堆积。为了解决这一问题，本研究探讨了MS向MgO膨胀剂（MEA）的转化。这种方法可使每生产一吨多边环境协定消耗1.6-1.8吨MS。采用两种不同的方法来处理MEA中的杂质：方法A涉及洗涤和干燥，然后是高温煅烧（AMEA），而方法B涉及高温煅烧，然后是洗涤和干燥（BMEA）。研究系统分析了不同预处理方法对MEAs活性、水化产物、孔隙结构、膨胀行为和压缩性能的影响。此外，还研究了水化和硬化过程对mea膨胀性能的影响。试验结果表明，含AMEA试件的28天抗压强度仅为对照组的73.1 ~ 77.3 %。值得注意的是，AMEA试样MAS9在120天后出现过度膨胀。不同的杂质处理方法导致MgO晶粒尺寸和反应性的变化。相比之下，含有BMEA的试件在整个养护期间膨胀率稳定增加，28天抗压强度达到对照组的80.1-81.64 %。

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引用次数: 0

Influence of nanomaterials on mechanical performance and microstructure of cement paste 纳米材料对水泥浆体力学性能和微观结构的影响

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

Construction and Building Materials

Pub Date : 2026-01-10 DOI: 10.1016/j.conbuildmat.2026.145146

Shuo Feng , Huigang Xiao , Linmao Chen

This study investigated the effects of nanomaterials—nano-SiO₂ (NS), nano-TiO₂ (NT), carbon nanotubes (CNT), and graphene oxide (GO)—on the mechanical performance and microstructure of cement paste. Flowability, compressive and flexural strength, mineral composition, and microstructure were evaluated. Nanomaterials significantly reduced flowability, with 1 % NS and 0.1 % GO decreasing it by 67.4 % and 51.0 %, respectively. They enhanced early-age strength, increasing 3-day compressive strength by 17.0 %-28.0 % and flexural strength by 17.0 %-36.0 %. Zero-dimensional NS and NT were most effective for early-age compressive strength, while CNT provided sustained flexural improvement (up to 42.9 % at 28 d). GO showed moderate early enhancement but maintained later-stage strength gains. Nanomaterials did not form new hydration products but rather accelerated cement reactions through nucleation and ion dissolution, refined the pore structure, increased harmless pores, and reduced overall porosity.

本研究考察了纳米材料纳米sio2 （NS）、纳米tio2 （NT）、碳纳米管（CNT）和氧化石墨烯（GO）对水泥浆体力学性能和微观结构的影响。流动性、抗压和抗折强度、矿物成分和微观结构进行了评估。纳米材料显著降低了流动性，1 % NS和0.1 % GO分别使流动性降低了67.4% %和51.0% %。它们提高了早期强度，3天抗压强度提高17.0 %-28.0 %，抗弯强度提高17.0 %-36.0 %。零维NS和NT对早期抗压强度最有效，而CNT提供持续的弯曲改善（28 d时高达42.9% %）。氧化石墨烯在早期表现出适度的增强，但在后期保持了强度的增加。纳米材料并没有形成新的水化产物，而是通过成核和离子溶解加速水泥反应，细化了孔隙结构，增加了无害孔隙，降低了整体孔隙率。

引用次数: 0

Investigation on adhesion damage behavior between high-viscosity asphalt and aggregates during long-term aging process 高粘度沥青与骨料在长期老化过程中的粘附损伤行为研究

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

Construction and Building Materials

Pub Date : 2026-01-10 DOI: 10.1016/j.conbuildmat.2026.145179

Haoxuan Jin , Qiang Li , Jiaqing Wang , Xiaowei Wang , Xuelian Li , Junqiu Zheng

High-viscosity asphalt (HVA) is widely applied in high-performance pavement structures owing to its superior interfacial adhesion. However, the adhesion between HVA and aggregates is markedly weakened by prolonged in-service aging, and the durability of pavement structures is consequently impaired. The roles of individual HVA fractions in long-term interfacial deterioration remain unclear. This limitation restricts the development of targeted restoration strategies. In this study, the decay of interfacial adhesion at TAFPACK-Super (TPS) modified HVA–aggregate interfaces under accelerated aging was systematically investigated. The asphalt fractions governing this adhesion were identified. The binder bond strength (BBS) test was employed to evaluate interfacial adhesion, while Fourier-transform infrared spectroscopy (FTIR), dipole moment measurement, and atomic force microscopy (AFM) were applied to reveal the changes in chemical structure and the evolution of surface morphology. Compared with conventional SBS-modified asphalt, the initial interfacial adhesion strength between TPS-modified HVA and aggregates was 26.9 % higher. However, the bond strength was reduced by 51.5 % after 40 h of aging, indicating a markedly higher susceptibility to aging. The resin fraction exhibited the most severe deterioration in interfacial adhesion, with a strength loss of 41.4 % and a failure mode transition from cohesive failure to adhesive failure. This phenomenon was attributed to oxidative aggregation in the colloid, accompanied by increases of 157.1 % and 109.5 % in carbonyl and sulfoxide indices, respectively. AFM observations further revealed severe aggregation on the colloidal surface and a 65.8 % reduction in microscopic adhesion force. Changes in the spatial distribution of surface features were found to have a stronger influence on interfacial energy than roughness alone. Regression analysis showed that among all SARA fractions, resin-related indices had the strongest and most consistent associations with interfacial adhesion loss. These findings provide a useful reference for durability-oriented design and maintenance of porous asphalt pavements.

高粘度沥青以其优异的界面附着力在高性能路面结构中得到广泛应用。然而，随着使用时间的延长，HVA与骨料之间的粘结性明显减弱，从而损害了路面结构的耐久性。个别HVA组分在长期界面恶化中的作用尚不清楚。这一限制限制了有针对性的恢复策略的发展。本研究系统地研究了TAFPACK-Super （TPS）改性HVA-aggregate界面在加速老化条件下的界面附着力衰减。确定了控制这种粘附的沥青馏分。采用粘结剂结合强度（BBS）测试评价界面粘附性，采用傅里叶变换红外光谱（FTIR）、偶极矩测量和原子力显微镜（AFM）观察化学结构的变化和表面形貌的演变。与常规sbs改性沥青相比，tps改性HVA与集料的初始界面粘附强度提高26.9 %。时效40 h后，合金的结合强度降低了51.5 %，表明其对时效的敏感性明显提高。树脂组分表现出最严重的界面附着力恶化，强度损失为41.4% %，破坏模式从内聚破坏转变为粘结破坏。这一现象归因于胶体的氧化聚集，羰基指数和亚砜指数分别上升了157.1 %和109.5 %。原子力显微镜观察进一步显示胶体表面严重聚集，微观附着力降低65.8% %。表面特征空间分布的变化对界面能的影响比粗糙度本身更大。回归分析表明，在SARA各组分中，树脂相关指标与界面粘附损失的相关性最强，且最一致。研究结果为多孔沥青路面的耐久性设计和养护提供了有益的参考。

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引用次数: 0

Feasibility of fly ash-based geopolymer as a sustainable alternative to cement in concrete production 粉煤灰基地聚合物作为水泥在混凝土生产中的可持续替代品的可行性

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

Construction and Building Materials

Pub Date : 2026-01-10 DOI: 10.1016/j.conbuildmat.2026.145143

Jianzun Lu , Jiajun Chen , Chiu-Hong Lee , Yu Li , Huada Daniel Ruan , Sabrina Yanan Jiang

This study evaluates the potential of superhydrophobic fly ash-based geopolymers as sustainable substitutes for cement in concrete production. Three fabrication methods using PFDS, CS, and WFNS, were compared for their effects on physical, chemical, and mechanical properties of cement specimens. FA-PFDS and FA-WFNS demonstrated significant superhydrophobicity, attributed to surface modification with low-energy groups, as confirmed by wettability tests. Water absorption and compressive strength assessments revealed that modified FA, particularly FA-PFDS and FA-WFNS, exhibited enhanced water resistance and mechanical performance compared to unmodified FA. In contrast, FA-CS did not effectively decrease water absorption and adversely affected compressive strength. Microstructural analysis via XRD and FTIR supported these findings. Notably, cement specimens containing 40 % FA-PFDS and FA-WFNS achieved compressive strengths of 16.3 MPa and 15.1 MPa, respectively, surpassing those with 40 % unmodified FA (12.6 MPa). These results indicate that modified FA-based geopolymers offer a promising, durable, and sustainable alternative to conventional cement.

本研究评估了超疏水粉煤灰基地聚合物作为水泥在混凝土生产中的可持续替代品的潜力。比较了PFDS、CS和WFNS三种制备方法对水泥试件物理、化学和力学性能的影响。润湿性测试证实，FA-PFDS和FA-WFNS表现出明显的超疏水性，这是由于表面被低能基团修饰所致。吸水率和抗压强度评估显示，与未改性的FA相比，改性FA，特别是FA- pfds和FA- wfns表现出更强的耐水性和机械性能。相反，FA-CS不能有效降低吸水率，并对抗压强度产生不利影响。通过XRD和FTIR的微观结构分析支持了这些发现。值得注意的是，含有40 % FA- pfds和FA- wfns的水泥试件的抗压强度分别为16.3 MPa和15.1 MPa，超过了含有40 %未改性FA的水泥试件（12.6 MPa）。这些结果表明，改性fa基地聚合物为传统水泥提供了一种有前途的、耐用的、可持续的替代品。

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引用次数: 0

Experimental investigation of alternative tie-rod solutions for stabilizing masonry façades 稳定砌体立面的替代拉杆方案试验研究

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

Construction and Building Materials

Pub Date : 2026-01-10 DOI: 10.1016/j.conbuildmat.2026.145191

Eugenia Verrigni Petrei Castelli , Giacomo Destro Bisol , Luigi Sorrentino

Historical masonry constructions often lack adequate connections between their façades and transverse structures, making them vulnerable to out-of-plane failures during earthquakes. Historically, tie rods have been used to prevent such failures and delivering a box-like behavior of masonry structures, essential for their seismic stability. The strength and the brittle or ductile behavior of tie rods are highly influential on the response of masonry façades. Preliminary experiments available in the literature have shown that tie rods may develop limited displacement capacity due to the threading necessary for their installation and tightening. The research investigates alternative solutions for tie rods, considering homogeneous or fuse-based setups. Homogenous tie rods are made either of carbon or stainless steel, with one or two nuts at each end. The effect of threading length is studied as well, up to fully threaded rods for carbon steel. Fuse-based setups have a plastic middle element, either of nylon or PEEK. Two diameters are considered in all setups. A total of 215 tests are performed. Threading the ends of homogenous steel rods reduces strength and ultimate strain, compared to a smooth rod. Increasing the threading length increases displacement capacity. Adding a nut has a small effect, but it may change the type of failure. Considering a fuse-based solution highly increases ultimate strain but dramatically reduces strength. The most promising solution resorts to fully threaded rods, balancing strength reduction and displacement capacity. However, the delivered displacement capacity is much smaller than usually assumed and might involve the revision of current equivalent-static design procedures.

历史上的砖石建筑通常在其横向结构和横向结构之间缺乏足够的连接，使它们在地震期间容易发生面外破坏。从历史上看，拉杆已被用于防止此类故障，并提供砌体结构的盒状行为，这对其地震稳定性至关重要。拉杆的强度和脆性或延性对砌体表面的响应有很大影响。文献中的初步实验表明，拉杆可能由于其安装和拧紧所需的螺纹而发展出有限的位移能力。该研究调查了拉杆的替代解决方案，考虑均匀或基于保险丝的设置。均质拉杆由碳或不锈钢制成，两端各有一个或两个螺母。对螺纹长度的影响也进行了研究，直至碳钢的全螺纹杆。保险丝为基础的设置有一个塑料的中间元件，尼龙或PEEK。在所有设置中都考虑两个直径。总共执行了215次测试。与光滑的钢杆相比，在均质钢杆的末端穿线可以降低强度和极限应变。增加螺纹长度增加驱替能力。加一个螺母效果不大，但可能会改变故障类型。考虑基于保险丝的解决方案，极大地增加了极限应变，但大大降低了强度。最有希望的解决方案是采用全螺纹杆，平衡强度降低和驱替能力。然而，交付的驱替能力比通常假设的要小得多，并且可能涉及对当前等效静力设计程序的修订。

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引用次数: 0

Supersulfated cement based on mechanically activated fired brick powder: Fresh properties, mechanical strength and microstructural characteristics 机械活化烧结砖粉基超硫酸盐水泥：新鲜性能、机械强度和微观结构特征

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

Construction and Building Materials

Pub Date : 2026-01-10 DOI: 10.1016/j.conbuildmat.2026.145152

A. Seco, M.A. Martín-Antunes, S. Espuelas, J.M. del Castillo, E. Prieto

This study explores the use of mechanically activated waste fired brick powder (FBP) as a substitute for Ground Granulated Blastfurnace Slag (GGBS) in Supersulfated Cement (SSC) formulations. Mortars and pastes were manufactured with GGBS replacement levels ranging from 0 wt% (FBP0) to 100 wt% (FBP100). The FBP10 combination achieved the lowest fresh consistency, increasing by 17 % compared to the reference. Higher FBP contents increased consistency due to greater water demand. All combinations exhibited a pH peak within the first 24 h after mixing, followed by a gradual decrease and stabilization by 48 h. The pH level was governed by the GGBS replacement rate, with lower values observed at higher FBP contents. The onset and progression of setting were closely linked to pH changes. Setting times decreased with increasing FBP content, due to reduced ettringite formation, higher water affinity, and enhanced nucleation from FBP’s finer particles. Mortars cured in water showed slight expansion, while air-cured samples exhibited shrinkage up to 0.138 % (FBP5), attributed to limited water availability for ettringite and the formation of Calcium Silicate Hydrate (C-S-H) gels. At 90 days, FBP10 improved compressive strength by 16.8 % over the reference; substitutions up to 50 % maintained or enhanced the mechanical performance of FBP0. Microstructural analyses (Thermogravimetry, X-Ray Diffraction and Scanning Electron Microscopy-Energy Dispersive X-ray Spectroscopy) confirmed ettringite and C-S-H gels as the only hydration products. These results demonstrate the potential of FBP as a sustainable and technically viable precursor for SSC, reducing reliance on industrial by-products while maintaining or improving cement performance.

本研究探讨了在超硫酸盐水泥（SSC）配方中使用机械活化废烧制砖粉（FBP）作为磨粒高炉渣（GGBS）的替代品。生产的砂浆和膏体的GGBS替代水平从0 wt% （FBP0）到100 wt% （FBP100）。与对照相比，FBP10组合获得了最低的新鲜一致性，增加了17. %。更高的FBP含量增加了稠度，因为需水量更大。所有组合在混合后的前24 h内均出现pH峰值，随后在48 h内逐渐降低并趋于稳定。pH值受GGBS替代率的影响，FBP含量越高，pH值越低。凝固的发生和进展与pH值的变化密切相关。随着FBP含量的增加，由于钙矾石的形成减少，亲水性提高，FBP颗粒的成核增强，凝结时间缩短。在水中固化的砂浆表现出轻微的膨胀，而空气固化的砂浆表现出高达0.138 % （FBP5）的收缩，这是由于钙矾石的水可用性有限和水合硅酸钙（C-S-H）凝胶的形成。在90天，FBP10的抗压强度比参考材料提高了16.8% %；高达50% %的替换维持或增强了FBP0的机械性能。显微结构分析（热重、x射线衍射和扫描电镜-能量色散x射线光谱）证实钙矾石和C-S-H凝胶是唯一的水化产物。这些结果证明了FBP作为SSC的可持续和技术上可行的前体的潜力，减少了对工业副产品的依赖，同时保持或改善了水泥的性能。

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引用次数: 0

Modification of steel slag on the working performance of solid waste-based grouting materials 钢渣改性对固废基注浆材料工作性能的影响

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

Construction and Building Materials

Pub Date : 2026-01-10 DOI: 10.1016/j.conbuildmat.2026.145196

Dedan Duan , Hao Zhang , Kuncan Zheng , Junmao Qie , Jun Huang , Qingnan Xue , Huiping Song

This study proposes a design strategy that leverages the micro-expansion and self-cementitious properties of steel slag (SS) to enhance the performance of solid waste-based grouting materials. By precisely adjusting the SS content and incorporating it into a fully solid waste-based matrix composed of 70 wt% circulating fluidized bed fly ash (CFBFA) and 30 wt% carbide slag (CS), a novel solid waste-based grouting materials was successfully developed. The effects of SS on the mechanical properties, rheological behavior, and carbon capture performance of the CFBFA-CS system were systematically investigated. It indicates that the addition of 10 % SS increased the stone ratio of the grouting materials by 5.2 % and improved the compressive strength by 4.6 %. This is mainly attributed to the free CaO (f-CaO) in SS, which effectively enhanced the stone formation of the system, while the dicalcium silicate (C₂S) and tricalcium silicate (C₃S) present in SS underwent further hydration, generating additional hydration products and thereby strengthening the materials. Furthermore, the incorporation of SS significantly reduced the viscosity of the slurry and improved its fluidity. In terms of carbon capture performance, by introducing CO₂ during the mixing process, the calcium carbonate (CaCO₃) yield of the CFBFA-CS-10 % SS system increased by 3.8 %, indicating its potential for further enhancing carbon capture capacity.

本研究提出了一种利用钢渣的微膨胀和自胶凝特性来提高固废基注浆材料性能的设计策略。通过精确调整SS含量，将其掺入由70% wt%循环流化床粉煤灰（CFBFA）和30% wt%电石渣（CS）组成的全固体废物基基质中，成功研制出一种新型固体废物基注浆材料。系统研究了SS对CFBFA-CS体系的力学性能、流变性能和碳捕集性能的影响。结果表明：掺量为10 %的SS可使注浆材料的石料比提高5.2 %，抗压强度提高4.6 %。这主要是由于SS中游离的CaO （f-CaO）有效地促进了体系的结石形成，而SS中存在的硅酸二钙（C2S）和硅酸三钙（C3S）进一步水化，产生了额外的水化产物，从而强化了材料。此外，SS的加入显著降低了浆料的粘度，提高了浆料的流动性。在碳捕集性能方面，通过在混合过程中引入CO2， CFBFA-CS-10 % SS体系的碳酸钙（CaCO3）产率提高了3.8 %，表明其具有进一步提高碳捕集能力的潜力。

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