Materials and Structures最新文献_第10页

Deformation behaviour of concrete with different moisture contents subjected to compressive creep and cyclic loading 不同含水率的混凝土在抗压蠕变和循环荷载作用下的变形行为

IF 3.4 3区工程技术

Materials and Structures Pub Date : 2024-06-23 DOI: 10.1617/s11527-024-02399-7

Bianca Kern, Anna-Lena Podhajecky, Ludger Lohaus, Michael Haist, Nadja Oneschkow

{"title":"Deformation behaviour of concrete with different moisture contents subjected to compressive creep and cyclic loading","authors":"Bianca Kern, Anna-Lena Podhajecky, Ludger Lohaus, Michael Haist, Nadja Oneschkow","doi":"10.1617/s11527-024-02399-7","DOIUrl":"10.1617/s11527-024-02399-7","url":null,"abstract":"<div><p>The expected long-term deformations of concrete structures are calculated using creep models, derived from experiments performed with constant mechanical loads. However, in the majority of real structures, such as bridges, constant creep loads are superimposed with cyclic loads of substantial magnitude. Additionally, such structures are subject to changes in environmental conditions (temperature and humidity). Deformation measurements of existing bridges have shown significant underestimations by established creep models, which might be traced back to the superimposition of cyclic loads and different moisture contents. Therefore, the developments of strains, viscoplastic strains and modulus of elasticity under creep and cyclic loading of a normal strength concrete have been comparatively investigated for two different pore moisture contents (approx. 100 and 75%). The results show that viscous strains due to cyclic loading are significantly higher than those due to creep loading at the mean stress level of cyclic loading. Furthermore, the strains are higher for the higher moisture content. The differences in the development of the modulus of elasticity and viscoplastic strains of both load types give clear indication for load type dependent microstructural deformation mechanisms. The results obtained concerning the influence of the load type and the moisture content need to be considered for the improvement of existing models.</p></div>","PeriodicalId":691,"journal":{"name":"Materials and Structures","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1617/s11527-024-02399-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141512940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fatigue performance analysis of fine aggregate matrix using a newly designed experimental strategy and viscoelastic continuum damage theory 利用新设计的实验策略和粘弹性连续损伤理论分析细骨料基体的疲劳性能

IF 3.4 3区工程技术

Materials and Structures Pub Date : 2024-06-20 DOI: 10.1617/s11527-024-02338-6

Zhifei Tan, Hui Li, Zhen Leng, Binbin Yin, Danning Li, Fuliao Zou, Peng Cao

{"title":"Fatigue performance analysis of fine aggregate matrix using a newly designed experimental strategy and viscoelastic continuum damage theory","authors":"Zhifei Tan, Hui Li, Zhen Leng, Binbin Yin, Danning Li, Fuliao Zou, Peng Cao","doi":"10.1617/s11527-024-02338-6","DOIUrl":"10.1617/s11527-024-02338-6","url":null,"abstract":"<div><p>Fine aggregate matrix (FAM), as the matrix phase in asphalt concrete (AC), significantly affects the fatigue behavior of AC. To accurately assess the mechanical properties of FAM, a newly designed experimental strategy for FAM testing was developed, and the viscoelastic continuum damage theory (VECD) theory was applied to analyze FAM’s fatigue cracking characteristics. In this study, a dumbbell-shaped geometry for dynamic shear rheometer testing was designed and verified through the FE-aided method. Subsequently, three AC mixtures’ FAM specimens with this special geometry were fabricated for the frequency sweep and linear amplitude sweep tests. Results showed that the specially designed specimens effectively capture the viscoelastic and fatigue properties of FAM with high replicability. Analyses based on the VECD theory indicated that FAM of porous asphalt (FAM(PA13)), featuring a higher asphalt content, exhibits a significant reduction in pseudo stiffness with increasing damage at the initial stage, but the reduction rate diminishes as damage progresses when compared to the other two FAMs. It was speculated that the higher aggregate content in FAM of dense-graded AC mixture (FAM(AC20) induces stress concentrations in the asphalt mastic near the protrusion areas of aggregates, thereby rendering the sample more susceptible to damage. The proposed methods will be readily extended to characterize other mechanical properties of FAM.</p></div>","PeriodicalId":691,"journal":{"name":"Materials and Structures","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1617/s11527-024-02338-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141512935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of self-healing mechanism on the fatigue life of recycled asphalt mixes 自愈机制对再生沥青混合料疲劳寿命的影响

IF 3.4 3区工程技术

Materials and Structures Pub Date : 2024-06-20 DOI: 10.1617/s11527-024-02412-z

Sonaly Mendes Arruda, Conrado Cesar Vitorino Pereira da Silva, Ana Letícia Feitosa de Macêdo, Amanda Mendes Arruda, Jonny Dantas Patrício, Leda Christiane de Figueiredo Lopes Lucena

{"title":"Effects of self-healing mechanism on the fatigue life of recycled asphalt mixes","authors":"Sonaly Mendes Arruda, Conrado Cesar Vitorino Pereira da Silva, Ana Letícia Feitosa de Macêdo, Amanda Mendes Arruda, Jonny Dantas Patrício, Leda Christiane de Figueiredo Lopes Lucena","doi":"10.1617/s11527-024-02412-z","DOIUrl":"10.1617/s11527-024-02412-z","url":null,"abstract":"<div><p>This study analyzed how the self-healing potential of recycled asphalt mixtures with varying levels of RAP (0%, 10%, 30%, and 50%) affects its fatigue resistance. To achieve this objective, the specimens were subjected to controlled tensions corresponding to 25%, 50%, and 75% of the fatigue life determined through Indirect Tensile Fatigue Test (ITFT). Subsequently, self-healing was induced. This process involved heating the confined specimens to 45 °C for 4 h, followed by 24 h of rest at an ambient temperature of 25 °C and then carrying out ITFT tests until rupture. After testing, it was possible to quantify the self-healing index and the percentage of extension on the fatigue life achieved post-self-regeneration. The results indicate that increased RAP content leads to more significant difficulties in mobilizing asphalt binders to seal cracks, resulting in reduced self-healing capacity. However, when self-healing occurs at a lower damage level in RAP-containing mixtures, a substantial increase in fatigue life may occur. As a result, the self-regeneration process plays a subtle yet significant role in extending the lifespan of pavement. This effect is particularly effective in rectifying minor damages caused by traffic-induced stresses.</p></div>","PeriodicalId":691,"journal":{"name":"Materials and Structures","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141508275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

New insight into the phase changes of gypsum 对石膏相变的新认识

IF 3.4 3区工程技术

Materials and Structures Pub Date : 2024-06-15 DOI: 10.1617/s11527-024-02404-z

Jitka Krejsová, Radomír Kužel, Martin Keppert, Lenka Scheinherrová, Alena Vimmrová

引用次数: 0

Eco-friendly modified engineered cementitious composites: a study on mechanical, durability and microstructure characteristics 生态友好型改性工程水泥基复合材料：力学、耐久性和微观结构特征研究

IF 3.4 3区工程技术

Materials and Structures Pub Date : 2024-06-15 DOI: 10.1617/s11527-024-02403-0

N. Shanmugasundaram, S. Praveenkumar

{"title":"Eco-friendly modified engineered cementitious composites: a study on mechanical, durability and microstructure characteristics","authors":"N. Shanmugasundaram, S. Praveenkumar","doi":"10.1617/s11527-024-02403-0","DOIUrl":"10.1617/s11527-024-02403-0","url":null,"abstract":"<div><p>This research examined the development of modified engineered cementitious composites (MECC) using manufactured sand (M-sand) and a high content of raw agricultural by-products, such as bagasse ash (BA) and rice husk ash (RHA), instead of conventional silica sand and fly ash. Fourteen different types of MECC mixtures were developed using raw BA and RHA blended with M-sand to reduce the cost of MECC. The fresh and hardened properties of all mixtures were examined using various types of testing methods. In addition, microstructure analysis were conducted for both the control and optimal mixtures to identify the bonding of fibres in cementitious composites. The correlation between conventional and MECC was also evaluated based on the hardened properties and cost analysis. The results revealed that workability steadily dwindled with increasing percentages of BA and RHA, from 10 to 55. Optimal mechanical properties were attained with the incorporation of BA and RHA at 10% cement replacement. In contrast, 30% BA and 40% RHA exhibited maximum impact strength compared to the respective control mixes. Similarly, ECC with 20% BA and RHA exhibited optimal durability properties. Moreover, compared to conventional ECC, the cost of the newly developed MECC was slightly lesser due to the incorporation of agricultural by-products and M-sand.</p></div>","PeriodicalId":691,"journal":{"name":"Materials and Structures","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141404536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exploring the efficacy of sawdust ash as a mineral filler substitute for the production of asphalt mixtures 探索将锯屑灰作为矿物填料替代品用于生产沥青混合料的功效

IF 3.4 3区工程技术

Materials and Structures Pub Date : 2024-06-14 DOI: 10.1617/s11527-024-02402-1

Mayank Sukhija, Aliaa F. Al-ani, Hussein K. Mohammad, Amjad Albayati, Yu Wang

{"title":"Exploring the efficacy of sawdust ash as a mineral filler substitute for the production of asphalt mixtures","authors":"Mayank Sukhija, Aliaa F. Al-ani, Hussein K. Mohammad, Amjad Albayati, Yu Wang","doi":"10.1617/s11527-024-02402-1","DOIUrl":"10.1617/s11527-024-02402-1","url":null,"abstract":"<div><p>Many waste materials can be repurposed effectively within asphalt concrete to enhance the performance and sustainability of pavement. One of these waste materials is sawdust ash (SDA). This study explores the beneficial use of SDA as a substitute for limestone dust (LD) mineral filler in asphalt concrete. The replacement rate was 0%, 15%, 30%, 45%, and 60% by weight of total mineral filler. Scanning electron microscopy (SEM) was employed to assess the surface morphology of Sawdust (SD), SDA, and LD. In addition, a series of tests, including Marshall stability and flow, indirect tensile strength, moisture susceptibility, and repeated uniaxial loading tests, were conducted to examine the performance characteristics of asphalt mixtures of different SDA content. As per Marshall mix design, a slightly higher binder content was required for the preparation of SDA mixes. The results reveal that the asphalt mixtures prepared using SDA attain a tensile strength ratio (TSR) greater than the critical threshold, i.e., 80%, indicating the feasibility of SDA against moisture-induced damage. The highest TSR value of 87% was obtained using 45% SDA as a replacement for LD. Compared to 0% SDA, there is a reduction of 12.08% in permanent deformation for asphalt mixtures produced with 60% SDA. Also, as the SDA content increases, there is a slight improvement in the resilient modulus values, with a peak improvement of 3% at 60% SDA. In addition, the cost of producing SDA mixes was relatively lower than the control mixes, indicating the cost-effectiveness of using SDA. Overall, the study found that SDA is a promising material that can improve the performance and durability of asphalt concrete at lower production costs.</p></div>","PeriodicalId":691,"journal":{"name":"Materials and Structures","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141407499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Changes in air permeability of restrained expansive concrete under drying condition: contribution of expansive strain 约束膨胀混凝土在干燥条件下的透气性变化：膨胀应变的贡献

IF 3.4 3区工程技术

Materials and Structures Pub Date : 2024-06-13 DOI: 10.1617/s11527-024-02401-2

Adhitya Leonard Wijaya, Kenichiro Nakarai

{"title":"Changes in air permeability of restrained expansive concrete under drying condition: contribution of expansive strain","authors":"Adhitya Leonard Wijaya, Kenichiro Nakarai","doi":"10.1617/s11527-024-02401-2","DOIUrl":"10.1617/s11527-024-02401-2","url":null,"abstract":"<div><p>Restraining the expansion of expansive concrete with embedded rebars can exert chemical prestressing, which may affect the durability of concrete structures. This study aims to investigate the durability performance of expansive concrete by understanding the mechanism of air permeability changes while considering the variations in reinforcement arrangements and concrete dimensions. The Torrent’s air permeability test was used to non-destructively evaluate the disparity in air permeability changes of expansive and normal concrete during the drying processes from 28 to 182 days. Additionally, expansive strain changes were continuously monitored to investigate chemical prestress. The experimental test results suggest the immense effect of the change in expansive strain on the air permeability of concrete. This study proposes that the change in microstructure owing to the loss of expansive strain may cause an increase in air permeability. The loss of expansive strain is a distinguished feature that differentiates the mechanism of air permeability changes in expansive and normal concrete. These findings suggest the possible improvement in the durability performance of expansive concrete in cases where the loss of its expansive strain can be controlled.</p></div>","PeriodicalId":691,"journal":{"name":"Materials and Structures","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1617/s11527-024-02401-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141414281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Correction: Rehabilitating instead of rebuilding aged or damaged pre-fabricated concrete buildings for reducing CO2 emissions: the case of Ukraine 更正：修复而非重建老化或损坏的预制混凝土建筑以减少二氧化碳排放：乌克兰案例

IF 3.4 3区工程技术

Materials and Structures Pub Date : 2024-06-11 DOI: 10.1617/s11527-024-02392-0

Viacheslav Troian, Volodymyr Gots, Robert J. Flatt, Ueli Angst

引用次数: 0

Experimental flexural investigation of RC beams with impeded steel truss using smooth steel angels 使用光滑钢角对带有受阻钢桁架的 RC 梁进行试验性抗弯研究

IF 3.4 3区工程技术

Materials and Structures Pub Date : 2024-06-11 DOI: 10.1617/s11527-024-02389-9

Eslam A. Lofty, Ismail M. Kamal, Khaled Mostafa Hassan, Mostafa A. Hassan

{"title":"Experimental flexural investigation of RC beams with impeded steel truss using smooth steel angels","authors":"Eslam A. Lofty, Ismail M. Kamal, Khaled Mostafa Hassan, Mostafa A. Hassan","doi":"10.1617/s11527-024-02389-9","DOIUrl":"10.1617/s11527-024-02389-9","url":null,"abstract":"<div><p>This paper emphasizes on testing the flexural capacity of Hybrid Steel Truss Reinforced Concrete Beam (HSTRCB), where a prefabricated steel truss is embedded into concrete beam instead of conventional rebars, forming a composite section. Five doubly reinforced concrete beams were designed, casted, experimentally tested and analyzed to investigate the flexural behavior of HSTRCB, in comparison to ordinary reinforced concrete beam. All beams were designed according to ACI 318, having same flexural capacity. First beam is ordinary reinforced concrete beam while the other four HSTRCB were designed having identical smooth steel angles, as compression and tension reinforcement, with different shear reinforcement alignment, and spacing. Different smooth truss typology were used as reinforced rebar replacement in the RC beams to determine the significant truss configuration that has highest flexural behaviour. The results showed that HSTRCB improves cracking moment, stiffness, energy absorption and effective cracked moment of inertia during the entire loading stages.</p></div>","PeriodicalId":691,"journal":{"name":"Materials and Structures","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1617/s11527-024-02389-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141394627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Correction: Automatic generation of high-fidelity representative volume elements and computational homogenization for the determination of thermal conductivity in foamed concretes 更正：自动生成高保真代表性体积元素并进行计算均质化，以确定发泡混凝土的导热性能

IF 3.4 3区工程技术

Materials and Structures Pub Date : 2024-06-03 DOI: 10.1617/s11527-024-02395-x

Víctor D. Fachinotti, Ignacio Peralta, Sebastián Toro, Bruno A. Storti, Antonio Caggiano

引用次数: 0