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Modified procedure for assessing the bending strength of composite GFRP poles 评估玻璃纤维增强塑料复合材料电杆抗弯强度的改进程序
IF 7.4 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-11-15 DOI: 10.1016/j.conbuildmat.2024.139182
Filip Broniewicz, Mirosław Broniewicz
Fibreglass lighting poles have gained a considerable amount of popularity in the market due to their advantages, and interest in them continues to grow. Consequently, the challenge of ensuring their safe design is becoming increasingly important. However, the current standard design procedure is not sufficient, because it does not consider one of the most common failure modes of composite poles, namely local buckling in the vicinity of the inspection opening. A verification of the standard’s calculated values has been done with the use of experimental testing. The calculated design bending strength was three times higher than the actual bending strength for 3.0 m high poles and twice higher for 9.0 m high poles. This paper proposes an improved method for estimating the bending resistance of composite poles with inspection openings. The method was developed using results from tests on full-scale poles, material sample tests, and experiments in a FEM environment. The proposed method provides more accurate results than the procedure for assessing the bending strength of these poles as presented in the EN 40–3–3 standard. The bending resistance value obtained using the modified calculation method is higher than the experimental value by an average of 6.6 %.
玻璃纤维照明灯杆因其优点而在市场上大受欢迎,人们对它们的兴趣也与日俱增。因此,如何确保其安全设计变得越来越重要。然而,目前的标准设计程序并不充分,因为它没有考虑到复合材料灯杆最常见的失效模式之一,即检查口附近的局部屈曲。通过实验测试对标准的计算值进行了验证。对于 3.0 米高的电杆,计算得出的设计抗弯强度是实际抗弯强度的三倍,而对于 9.0 米高的电杆,计算得出的设计抗弯强度是实际抗弯强度的两倍。本文提出了一种改进的方法,用于估算带有检查开口的复合材料电杆的抗弯强度。该方法是利用全尺寸电杆测试、材料样品测试和有限元环境实验的结果开发出来的。与 EN 40-3-3 标准中评估这些电杆抗弯强度的程序相比,所提出的方法能提供更精确的结果。使用修改后的计算方法得出的抗弯强度值比实验值平均高出 6.6%。
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引用次数: 0
Stability performance of corroded circular steel tube under eccentric compression 偏心压缩下腐蚀圆钢管的稳定性能
IF 7.4 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-11-15 DOI: 10.1016/j.conbuildmat.2024.139157
Zhengyi Kong , Bo Yang , Xiaofei Wang , Cuiqiang Shi , Rui Li , Ningning Hu , Qinglin Tao , George Vasdravellis , Quang-Viet Vu
This study examines the stability behavior of corroded circular steel tubes (CST) under eccentric compression. Accelerated corrosion testing is utilized to obtain 12 CST with different corrosion degree, and 3D scanning technology is then applied to analyze the surface corrosion characteristics of the CST members. Eccentric compression tests are performed on the CST members to assess the impact of corrosion on the stability behavior. A finite element (FE) method with corrosion characteristics, based on the 3D reverse reconstructed method and surface corrosion characteristics, is developed for the prediction of buckling response of corroded CST. Corrosion weakens the mechanical properties of Q345B steel, progressively shortening or eliminating the yield plateau of stress-strain curves. When the corrosion rate reaches 21.47 %, the ultimate load and local buckling load of the CST members drop by 44.99 % and 43.44 %, respectively. Uniform corrosion primarily affects the bearing capacity (BCP) of CST members, while the failure mode of CST is significantly influenced by local corrosion. Current specifications are inaccuracy for the BCP of corroded CST under eccentric compression as they do not consider the impact of local corrosion. A new formula modified from current specification is developed to accurately predict the BCP of CST members after corrosion.
本研究探讨了腐蚀圆钢管(CST)在偏心压缩下的稳定性行为。利用加速腐蚀试验获得了 12 根不同腐蚀程度的 CST,然后应用三维扫描技术分析了 CST 构件的表面腐蚀特征。对 CST 构件进行偏心压缩试验,以评估腐蚀对稳定性行为的影响。基于三维反向重建方法和表面腐蚀特征,开发了一种具有腐蚀特征的有限元(FE)方法,用于预测腐蚀 CST 的屈曲响应。腐蚀削弱了 Q345B 钢的机械性能,使应力-应变曲线的屈服平台逐渐缩短或消失。当腐蚀率达到 21.47 % 时,CST 构件的极限荷载和局部屈曲荷载分别下降了 44.99 % 和 43.44 %。均匀腐蚀主要影响 CST 构件的承载能力 (BCP),而 CST 的失效模式则主要受局部腐蚀的影响。现行规范没有考虑局部腐蚀的影响,因此在偏心压缩条件下计算腐蚀 CST 的承载能力不准确。我们在现行规范的基础上修改了一个新公式,以准确预测 CST 构件腐蚀后的 BCP。
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引用次数: 0
A damage model of rock-concrete composite in coal mine underground reservoirs 煤矿地下水库岩石-混凝土复合材料的破坏模型
IF 7.4 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-11-15 DOI: 10.1016/j.conbuildmat.2024.139046
Tenglong Rong , Jiawei Wang , Lujun Wang , Sheng Zhang , Xiaojian Ren , Yilu Yang , Yijia Zhou
In order to ensure the stability of rock-concrete composite (RCC) in coal mine underground reservoirs (CMURs), the theoretical damage model of the RCC was constructed in the present work. Considering the deformation compatibility between two different media of RCC on loading, the damage variable of RCC is deduced based upon the relationship between the damage variables of rock and concrete following the strain equivalence principle. Adjudging the failure of rock and concrete by different strength criteria, a damage model of RCC in coal mine underground reservoir (RCCD model) was developed. The experiments on the uniaxial and triaxial compressions of rock, concrete and RCC were used to validate the proposed damage model. The RCCD model curves exhibited four different periods in triaxial compression. The correlation coefficients between the values of RCCD model and the test values were determined to be 0.959, 0.981, 0.998 and 0.996. In addition, the correlation coefficients of rock and concrete were higher than 0.959. Moreover, the correlation of the parameters in the RCCD model was analyzed. The sensitivity of Weibull distribution parameters, height ratio coefficient, elastic modulus ratio and tension compression ratio of RCC were discussed. The study illustrates that the proposed RCCD model can satisfactorily characterize the mechanical characteristics of RCC under various loadings.
为了确保煤矿地下水库(CMURs)中岩石-混凝土复合材料(RCC)的稳定性,本研究构建了 RCC 的理论损伤模型。考虑到 RCC 两种不同介质在加载时的变形相容性,根据应变等效原理,根据岩石和混凝土的损伤变量之间的关系推导出 RCC 的损伤变量。根据不同的强度标准对岩石和混凝土的破坏进行判断,建立了煤矿地下水库中 RCC 的破坏模型(RCCD 模型)。岩石、混凝土和 RCC 的单轴和三轴压缩实验验证了所提出的破坏模型。RCCD 模型曲线在三轴压缩中表现出四个不同的周期。经测定,RCCD 模型值与测试值之间的相关系数分别为 0.959、0.981、0.998 和 0.996。此外,岩石和混凝土的相关系数均高于 0.959。此外,还分析了 RCCD 模型中各参数的相关性。讨论了 RCC 的 Weibull 分布参数、高度比系数、弹性模量比和拉压比的敏感性。研究结果表明,所提出的 RCCD 模型可以令人满意地描述 RCC 在各种荷载下的力学特性。
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引用次数: 0
Quasi-static and dynamic compressive behaviours of wet-sieved mortar at low temperatures 湿喷砂浆在低温下的准静态和动态抗压行为
IF 7.4 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-11-15 DOI: 10.1016/j.conbuildmat.2024.138940
Rong Xi , Jian Xie , Tao Wang , Jia-Bao Yan
This study experimentally investigated the quasi-static and dynamic compressive stress-strain behaviours of wet-sieved mortar (WSM) at 20 °C–−165 °C. Quasi-static and dynamic compression tests were carried out on 129 WSM cylinders using a 2000-kN universal test machine and a Ø75-mm split Hopkinson pressure bar device combined with a high-speed camera. Strain rates and low temperatures greatly influenced the failure processes and modes of WSM materials subjected to dynamic compression loadings. Test results showed that the decreasing temperature enhanced the strain rate effects on compressive strength and strain, modulus of elasticity, and specific energy absorption. Specifically, compared with the static compressive strength at ambient temperatures, the compressive strength at a strain rate of 200 s-1 was increased by 106.7 % and 251.2 % as the temperature equalled to 20 °C and −165 °C, respectively. Furthermore, empirical equations of low-temperature dynamic increasing factors were established through regression analyses. Finally, a modified low-temperature dynamic stress-strain model was proposed for WSM materials. Validations confirmed that the developed model reasonably described the stress-strain behaviours of WSM materials at 20 °C–−165 °C. The study results can be utilized to optimize the design of concrete at low temperatures, and the proposed stress-strain relationships can be employed to conduct more precise dynamic mesoscopic numerical simulations.
本研究通过实验研究了湿喷砂浆(WSM)在 20 ℃-165 ℃条件下的准静态和动态压缩应力-应变行为。使用 2000 千牛万能试验机和直径为 75 毫米的分体式霍普金森压力棒装置以及高速摄像机,对 129 个 WSM 筒体进行了准静态和动态压缩试验。应变率和低温在很大程度上影响了 WSM 材料在动态压缩载荷下的失效过程和模式。试验结果表明,温度的降低增强了应变速率对压缩强度和应变、弹性模量以及比能量吸收的影响。具体而言,与环境温度下的静态抗压强度相比,当温度等于 20 ℃ 和 -165 ℃ 时,应变率为 200 s-1 的抗压强度分别增加了 106.7 % 和 251.2 %。此外,还通过回归分析建立了低温动态增加因子的经验公式。最后,针对 WSM 材料提出了改进的低温动态应力应变模型。验证结果表明,所建立的模型合理地描述了 WSM 材料在 20 °C-165 °C 时的应力-应变行为。研究结果可用于优化低温下的混凝土设计,所提出的应力应变关系可用于进行更精确的动态介观数值模拟。
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引用次数: 0
Low-carbon cementitious materials: Scale-up potential, environmental impact and barriers 低碳水泥基材料:推广潜力、环境影响和障碍
IF 7.4 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-11-15 DOI: 10.1016/j.conbuildmat.2024.139087
Muhammad Riaz Ahmad , Ana Fernàndez-Jimenez , Bing Chen , Zhen Leng , Jian-Guo Dai
The construction industry's heavy reliance on ordinary Portland cement (OPC) significantly contributes to global carbon emissions, accounting for 7–9 % of CO2 emissions. This paper reviews low-carbon cementitious materials (LCCMs) as sustainable alternatives to OPC. Key LCCMs examined include supplementary cementitious materials (SCMs), limestone calcined clay cements (LC3), alkali-activated materials (AAMs), belite-rich Portland cements (BRPCs), ye’elimite-rich cements (YRCs), and non-hydraulic carbonatable binders (CBs). The paper examines the reaction mechanisms, hydration products, and properties of these materials, whereas scalability potential, cost, environmental impact, barriers, and research gaps are also highlighted. LC3 demonstrates high scalability potential due to its similarities with OPC, cost-effectiveness, and the abundant availability of raw materials. Environmentally, AAMs offer the most significant impact reduction, achieving a 40–75 % decrease compared to OPC, followed by LC3 (∼40 %), CBs (∼37 %), YRC (∼20–25 %), and BRPC (∼10 %). However, the costs of AAMs, YRC, and CBs may be higher than OPC and other LCCMs. Technical challenges and research gaps for LCCMs include low reactivity of SCMs, low early-age strength, prolonged setting times, availability of suitable activators, finding compatible superplasticizers, and a lack of long-term performance studies, which shall be further explored in the future. Existing infrastructure may not be adaptable for the new LCCMs, which may require a significant initial investment. Policy barriers are also significant, as updating standards is linked with the satisfactory long-term performance of LCCMs and is hindered by the dominance of OPC market. There is a need of enhanced collaboration efforts among researchers, industry, and policymakers to overcome these technical, economic, and policy barriers, paving the way for sustainable construction practices.
建筑行业对普通硅酸盐水泥(OPC)的严重依赖极大地加剧了全球碳排放,占二氧化碳排放量的 7-9%。本文回顾了作为 OPC 可持续替代品的低碳胶凝材料 (LCCM)。研究的主要低碳胶凝材料包括辅助胶凝材料 (SCM)、石灰石煅烧粘土水泥 (LC3)、碱活性材料 (AAM)、富含沸石的波特兰水泥 (BRPC)、富含叶沸石的水泥 (YRC) 以及非水力可碳化粘结剂 (CB)。本文研究了这些材料的反应机理、水化产物和特性,同时还强调了可扩展性潜力、成本、环境影响、障碍和研究空白。由于 LC3 与 OPC 相似、成本效益高且原材料丰富,因此具有很高的可扩展性。在环境方面,AAMs 能最显著地减少对环境的影响,与 OPC 相比可减少 40-75% 的影响,其次是 LC3(∼40%)、CBs(∼37%)、YRC(∼20-25%)和 BRPC(∼10%)。然而,AAMs、YRC 和 CBs 的成本可能高于 OPC 和其他低成本医疗模式。低密度聚合材料所面临的技术挑战和研究空白包括:单体材料的反应性低、早期强度低、凝结时间长、合适活化剂的可用性、寻找兼容的超塑化剂以及缺乏长期性能研究,这些都将在未来进一步探索。现有的基础设施可能无法适应新的低氯氯磺化合 物,这可能需要大量的初始投资。政策障碍也很重要,因为更新标准与低温冷凝器的长期性能是否令人满意息息相关,而 OPC 市场的主导地位阻碍了更新标准。需要加强研究人员、行业和政策制定者之间的合作,以克服这些技术、经济和政策障碍,为可持续建筑实践铺平道路。
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引用次数: 0
Performance evaluation of Stone Mastic Asphalt (SMA) mixtures with textile waste fibres 含纺织废纤维的石子胶凝沥青 (SMA) 混合物的性能评估
IF 7.4 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-11-15 DOI: 10.1016/j.conbuildmat.2024.139125
Wilder Rodríguez , Julián Rivera , Miguel Sevillano , Tania Torres
The research evaluates the performance of Stone Mastic Asphalt (SMA) mixtures using residual cotton fibres from the Peruvian textile industry to address the environmental pollution caused by this sector. A reference SMA20 mixture was established with 0.30 % commercial fibre and 6 % asphalt. Subsequently, this fibre was replaced by textile fibre in the same proportions. It was found that 0.20 % textile fibre optimally met the volumetric requirements and binder drainage tests. Performance tests showed that the textile fibre achieved a TSR of 95 %, compared to 82 % for the commercial fibre, and a rutting resistance of 2.82 mm compared to 2.46 mm for the commercial fibre. Additionally, the textile fibre demonstrated a better dynamic modulus at high temperatures. In conclusion, residual Peruvian cotton fibres can efficiently replace commercial fibres in SMA20 mixtures, with 0.20 % being the optimal amount, thus promoting sustainable material reuse.
这项研究评估了使用秘鲁纺织业残留棉纤维的石硫沥青(SMA)混合物的性能,以解决该行业造成的环境污染问题。研究使用 0.30% 的商业纤维和 6% 的沥青建立了 SMA20 混合料的参考模型。随后,用相同比例的纺织纤维替代了这种纤维。结果发现,0.20% 的纺织纤维最符合体积要求和粘结剂排水试验。性能测试表明,纺织纤维的 TSR 为 95%,而商用纤维为 82%;抗车辙能力为 2.82 毫米,而商用纤维为 2.46 毫米。此外,纺织纤维在高温下的动态模量更高。总之,秘鲁残留棉纤维可有效替代 SMA20 混合物中的商用纤维,0.20% 是最佳用量,从而促进了材料的可持续再利用。
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引用次数: 0
Efflorescence behavior and mechanism of burnt coal cinder-based geopolymers under different alkali activators 不同碱活化剂作用下烧煤渣基土工聚合物的侵蚀行为和机理
IF 7.4 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-11-15 DOI: 10.1016/j.conbuildmat.2024.139057
Muyang Huang , Shenxu Bao , Yimin Zhang , Zichen Zhou , Xiangke Jiao
Efflorescence of geopolymers is a common phenomenon, which is caused by overuse of activators and dissolution-crystallization of carbonate. It has been widely focused on, but its behavior and mechanism remain highly disputed. In the study, the behavior and mechanism of four alkali-activated burnt coal cinder-based geopolymers under two curing conditions of intensifying and inhibiting efflorescence was discussed. The study results show that the deterioration of geopolymer properties caused by efflorescence has a strong timeliness and is closely related to the progress of geopolymerization. Furthermore, through comparative verification of performance testing and phases analysis, the direct factor of the degradation of geopolymer properties is not the carbonate produced by excessive alkaline activators. The direct factor of it is that soluble active components (Si, Al or P) are carried to the surface of the geopolymer by the efflorescence substances, resulting in the permanent loss of gel products. Moreover, the efflorescence also shows a complex and close relationship with the types of activator combination, pore structure and curing system. The perception of the association between efflorescence formation and affecting factors provides important insights into the manufacturing and application of geopolymer related materials.
土工聚合物的萌生是一种常见现象,它是由活化剂的过度使用和碳酸盐的溶解-结晶造成的。这种现象已被广泛关注,但其行为和机理仍存在很大争议。本研究探讨了四种碱激活的烧煤渣基土工聚合物在加剧和抑制渗出两种固化条件下的行为和机理。研究结果表明,侵蚀引起的土工聚合物性能劣化具有很强的时效性,与土工聚合物的进展密切相关。此外,通过性能测试和阶段分析的对比验证,土工聚合物性能退化的直接因素并不是过量碱性活化剂产生的碳酸盐。其直接因素是可溶性活性成分(Si、Al 或 P)被侵蚀物质带到了土工聚合物的表面,导致凝胶产品的永久性损失。此外,渗出还与活化剂组合类型、孔隙结构和固化系统有着复杂而密切的关系。对风化形成与影响因素之间关系的认识为土工聚合物相关材料的生产和应用提供了重要启示。
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引用次数: 0
Study on the effects of organic-inorganic composite inhibitor on fume emissions of rubber modified asphalt 有机-无机复合抑制剂对橡胶改性沥青烟尘排放的影响研究
IF 7.4 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-11-15 DOI: 10.1016/j.conbuildmat.2024.139206
Jiahao Liu , Cong Qi , Quantao Liu , Huan Wang , Chong Wang , Yonghan Zhang , Shaopeng Wu , Na Li
During the construction process, the rubber asphalt (RA) results in the generation of considerable quantities of noxious fumes, endangering the safety of those employed in the field and causing unavoidable environmental damage. The traditional inorganic fume suppressants can reduce fume emissions, but compromise the low-temperature performance of asphalt. This paper addresses this issue by employing a combination of organic inhibitor and inorganic fume suppressant. Mechanical and rheological experiments reveal that the organic-inorganic composite inhibitor simultaneously enhance the rutting resistance of RA at high temperatures and the cracking resistance at low temperatures. The results of gas chromatography-mass spectrometry (GC-MS) show that the types of hydrocarbon derivatives (HYDs) and sulfides substances (SCs) in the volatile organic compounds (VOCs) of inorganic- organic composite inhibitor modified asphalt (INOORA) are reduced by 71.4 % and 76.9 % compared to RA, respectively. Brunauer-Emmett-Teller (BET), Fourier Transform Infrared Test (FT-IR), and Thermogravimetric analysis (TG-DTG) results suggest that the organic inhibitor reacts chemically with rubber asphalt components, increasing the size of certain small molecular VOCs in rubber asphalt, which is more readily adsorbed by the pores of diatomaceous earth, thereby synergistically reducing the VOCs concentration in rubber asphalt. The results provided a new method for preventing the volatilization of noxious substances from rubber asphalt, without compromising its road performance.
在施工过程中,橡胶沥青(RA)会产生大量有毒烟雾,危及现场工作人员的安全,并对环境造成不可避免的破坏。传统的无机烟雾抑制剂可以减少烟雾排放,但会影响沥青的低温性能。本文采用有机抑制剂和无机烟尘抑制剂的组合来解决这一问题。机械和流变实验表明,有机-无机复合抑制剂可同时增强 RA 在高温下的抗车辙能力和低温下的抗开裂能力。气相色谱-质谱(GC-MS)分析结果表明,无机-有机复合抑制剂改性沥青(INOORA)的挥发性有机化合物(VOCs)中碳氢化合物衍生物(HYDs)和硫化物(SCs)的种类与 RA 相比分别减少了 71.4% 和 76.9%。布鲁瑙尔-艾美特-泰勒(BET)、傅立叶变换红外测试(FT-IR)和热重分析(TG-DTG)结果表明,有机抑制剂与橡胶沥青成分发生化学反应,增大了橡胶沥青中某些小分子 VOC 的尺寸,而硅藻土的孔隙更容易吸附这些小分子 VOC,从而协同降低了橡胶沥青中的 VOC 浓度。研究结果为防止橡胶沥青中有害物质的挥发提供了一种新方法,同时又不影响其路面性能。
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引用次数: 0
Research on capillary water absorption characteristics of aeolian sand concrete under sulfate freeze-thaw coupling based on fractal theory 基于分形理论的硫酸盐冻融耦合条件下风化砂混凝土毛细吸水特性研究
IF 7.4 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-11-15 DOI: 10.1016/j.conbuildmat.2024.139184
Wei Dong , Junfeng Wang
Northwest China, represented by Inner Mongolia, is rich in desert resources, and the reasonable use of aeolian sand (AS) as fine aggregate for the preparation of aeolian sand concrete (ASC) can not only reduce land desertification but also alleviate the shortage of river sand (RS) resources. At the same time, more salt lakes in Inner Mongolia lead to concrete structures often accompanied by salt corrosion and freeze-thaw cycle (FTC) and other erosion effects. Therefore, this paper carries out the capillary water absorption (CWA) test on ASC under the coupling of sulphate FTC, and analyses the effects of different erosive environments (5 %Na2SO4, 10 %Na2SO4, 5 %Na2SO4+3.5 %NaCl) and the amount of AS dosage (0 %, 20 %, 100 %) on the CWA performance of ASC. The results show that, under the coupling effect of sulphate FTC, the expansion stress produced by moisture phase change and erosion products increases continuously, the initial defects inside the concrete develop continuously, the percentage of gel pores and less harmful pores decreases gradually, the compressive strength, relative dynamic elastic modulus (RDEM) and mass decrease gradually, and the concrete is damaged most seriously in the composite salt environment. The CWA of ASC mainly occurs before 2 h1/2, and there is a good correlation between the initial water absorption rate (IWAR) and the depth of CWA and the degree of freeze-thaw damage. The cumulative water absorption and the IWAR of ASC became smaller with the increase of AS dosage. By applying the fractal theory to the pore structure, it was found that the relationship between the fractal dimension and the IWAR and damage degree was good, and that a reasonable increase in the proportion of small pores below 50 nm was more favourable to the frost durability of ASC.
以内蒙古为代表的西北地区沙漠资源丰富,合理利用风化砂(AS)作为细骨料配制风化砂混凝土(ASC),不仅可以减少土地沙漠化,还可以缓解河砂(RS)资源短缺的问题。同时,内蒙古盐湖较多,导致混凝土结构常伴有盐蚀和冻融循环(FTC)等侵蚀作用。因此,本文进行了硫酸盐冻融循环耦合条件下ASC的毛细吸水率(CWA)试验,分析了不同侵蚀环境(5 %Na2SO4、10 %Na2SO4、5 %Na2SO4+3.5 %NaCl)和AS掺量(0 %、20 %、100 %)对ASC CWA性能的影响。结果表明,在硫酸盐 FTC 的耦合作用下,水分相变和侵蚀产物产生的膨胀应力不断增加,混凝土内部的初始缺陷不断发展,凝胶孔隙和危害较小的孔隙比例逐渐减少,抗压强度、相对动弹性模量(RDEM)和质量逐渐降低,混凝土在复合盐环境中的破坏最为严重。ASC 的 CWA 主要发生在 2 h1/2 之前,初始吸水率(IWAR)和 CWA 深度与冻融破坏程度有很好的相关性。随着 AS 用量的增加,ASC 的累积吸水率和 IWAR 越小。将分形理论应用于孔隙结构,发现分形维数与 IWAR 和破坏程度之间的关系良好,合理增加 50 nm 以下小孔隙的比例更有利于 ASC 的冻融耐久性。
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引用次数: 0
Crack propagation characterization of concrete under non-uniform corrosion of steel strand using digital image correlation 利用数字图像关联分析钢绞线非均匀腐蚀下混凝土裂缝扩展特征
IF 7.4 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Pub Date : 2024-11-15 DOI: 10.1016/j.conbuildmat.2024.139166
Yafei Ma , Jie Yang , Xiaochao Su , Anyin Peng , Lei Wang , Ke Huang
The steel strands in pretensioned prestressed concrete are susceptible to corrosion and expansion due to threatening environmental conditions, leading to concrete cracking, reduction in the bearing capacity and durability of structures. This paper presents an electrochemical accelerated corrosion test on steel strands. The internal strain, surface strain, and crack propagation in concrete specimens during the entire corrosion process of steel strands are continuously monitored using the digital image correlation (DIC) method and strain detection methods. The study investigates the effects of concrete cover thickness and stirrup arrangement on the surface strain field and crack propagation in concrete. A mesoscopic numerical model of concrete cracking under non-uniform corrosion of steel strands is established. The reliability of the constructed model is verified using experimental data. The results show that compared with traditional strain detection methods, the DIC method can detect initial cracks on the concrete surface 20 hours in advance. The proposed non-uniform mesoscopic simulation model can accurately simulate the entire process of concrete cracking induced by non-uniform corrosion of steel strands. The finite element (FE) model is consistent with the results obtained from DIC monitoring.
预应力混凝土中的钢绞线容易受到环境条件的威胁而发生腐蚀和膨胀,导致混凝土开裂,降低结构的承载能力和耐久性。本文介绍了钢绞线的电化学加速腐蚀试验。利用数字图像相关(DIC)方法和应变检测方法对钢绞线整个腐蚀过程中混凝土试样的内部应变、表面应变和裂缝扩展进行了连续监测。研究探讨了混凝土覆盖层厚度和箍筋布置对混凝土表面应变场和裂纹扩展的影响。建立了钢绞线非均匀腐蚀下混凝土开裂的中观数值模型。利用实验数据验证了所建模型的可靠性。结果表明,与传统的应变检测方法相比,DIC 方法可以提前 20 小时检测到混凝土表面的初始裂缝。所提出的非均匀介观模拟模型可以精确模拟钢绞线非均匀腐蚀诱发混凝土开裂的全过程。有限元(FE)模型与 DIC 监测结果一致。
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引用次数: 0
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Construction and Building Materials
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