Article
Construction & Building Technology
Mao Zhou, Fengfei He, Yaozhong Xu, Wenyu Zhang, Shiming Dong
Summary: This study investigates the influence of interface morphology on the bearing capacity and fracture characteristics of bi-material Brazilian disks, and finds that the loading angle is the main factor affecting the fracture patterns. The morphology of the interface has little influence on the failure patterns and bearing performances of the specimens when the loading angle exceeds 30 degrees. The groove interface significantly improves the bearing capacity of the interface.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Mechanical
Ch. F. Markides, S. K. Kourkoulis
Summary: This paper proposes a modified configuration of the standardized Brazilian disc, called the incurved Brazilian disc, to address the main drawback of the traditional indirect tensile test. The incurved disc has a truncated circular shape near the disc-jaw contact area, ensuring a wide contact arc with small stress concentrations. The analytical solution of this configuration is obtained using Muskhelishvili's complex potentials method and the results highlight advantages in the stress field intensity in the disc-jaw contact area compared to existing solutions.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Metallurgy & Metallurgical Engineering
Zi-long Zhou, Jian-you Lu, Xin Cai, Yi-chao Rui
Summary: The dynamic behavior and energy dissipation of the rock-concrete interface were investigated through dynamic splitting tests on bi-material discs. The study reveals that the inclination angles and groove width of the interface have an influence on the bearing capacity and dissipated energy of the specimens, with an optimal groove width of 5 mm.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2022)
Article
Engineering, Mechanical
Kewei Liu, Tengfei Guo, Jiacai Yang, Sizhou Ma
Summary: The fracture behavior of rock-concrete bi-material structures with interface crack was studied using both static and dynamic testing. It was found that different fracture patterns could occur depending on the interface inclination angle. The increase of strain rate led to more secondary cracks and an increase in dissipated energy. The dimensionless stress intensity factors (SIFs) and the crack length-diameter ratio also affected the fracture behavior. The interface inclination angle had a significant effect on both static and dynamic fracture toughness, with the dependence of dynamic fracture toughness on inclination being higher.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Materials Science, Characterization & Testing
Cheng Zhao, Rui Zhang, Chunfeng Zhao, Wendong Wang, Youbao Wang
Summary: The study found that surface roughness has a significant influence on the shear behavior of granular material/structure interfaces. The spatial distribution of the shear zone is non-uniform, with the thickness of the shear zone related to the average particle size.
JOURNAL OF TESTING AND EVALUATION
(2021)
Article
Construction & Building Technology
Jie Wang, Junlin Tao
Summary: In this study, a new method is proposed to determine the crack initiation tensile strength of concrete specimens by contrasting the load-time curve from digital image correlation and the split Hopkinson pressure bar system.
Article
Engineering, Multidisciplinary
Baoshou Liu, Xiaodong Huang, Yinan Cui
Summary: The rapid development of additive manufacturing provides new opportunities for fabricating multi-material structures. However, the graded-interface assumption between different materials often poses challenges in topology optimization. This study proposes a new element-based topology optimization algorithm that explicitly considers interface types and allows precise control of interface width. Numerical examples demonstrate that the optimized designs using this method achieve lower compliance compared to traditional multi-material designs.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Energy & Fuels
Xinying Liu, Feng Dai, Yi Liu, Pengda Pei, Zelin Yan
Summary: Research indicates that the dynamic tensile strength of naturally saturated specimens increases with loading rate, but decreases with pre-tension. Additionally, the dynamic strength of naturally saturated sandstone is lower than that of natural sandstone, with similar fracture behavior. Water effects on mechanical properties, water wedging effect, and Stefan effect explain the dynamic tensile behavior of rocks with static preload.
Article
Engineering, Geological
Earl Magsipoc, Giovanni Grasselli
Summary: Tensile fractures in brittle materials can be traced by striation features, and the use of mapping and streamline analysis can locate the fracture initiation sites and crack front positions, providing insights into the mechanisms associated with surface features in the fracture process.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Construction & Building Technology
Junfeng Guan, Shuo Wang, Lielie Li, Chaopeng Xie, Mehran Khan, Lihua Niu
Summary: Rock’s tensile strength and fracture toughness are crucial characteristics that greatly influence the safety of engineering structures. This study presents a theoretical model based on the cracked straight through Brazilian disc (CSTBD) test, allowing for the simultaneous determination of tensile strength and fracture toughness for rocks. The proposed model provides a comprehensive understanding of material properties through deriving expressions for nominal stress and equivalent crack length using the CSTBD approach. Furthermore, the model enables comparative analysis of test results for different rock types and accurate prediction of experimental peak load with 95% reliability.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Environmental
Mostafa Asadizadeh, Nima Babanouri, Taghi Sherizadeh
Summary: The mechanical response of rock bridges in concrete and rock structures has a significant impact on their stability. This study investigated the influence of non-persistent joint parameters on the tensile failure of rock structures and found that the artificial neural network approach had the best performance in predicting tensile strength. The study also highlighted the sensitivity of the model to joint continuity factor and loading direction.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Construction & Building Technology
Wenxu Li, Youjun Xie, Kunlin Ma, Guangcheng Long, Ning Li, Hong Zhao
Summary: The plastic viscosity of SCC mixture plays a crucial role in the bonding effect and mechanical properties between self-compacting concrete and steam-cured concrete, with higher viscosity enhancing the bonding performance between the two materials.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Civil
Qiangqiang Zheng, Ying Xu, Zhiqiang Yin, Feng Wang, Haijiang Zhang
Summary: This study aims to investigate the dynamic mechanical properties, strain field, energy evolution, and progressive cracking of damaged sandstone under impact loading. The experimental results show that the energy dissipation density ratio, scale of the initial central crack, strain, and level of rock fragmentation in the vicinity of the bar-sample interfaces all increase with increasing driving pressure or sandstone damage degree. These findings are of great significance to studying the mechanical responses of damaged rock and risk mitigation under dynamic catastrophes in rock engineering projects.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Dan Li, Yihuai Liang, Di Wu, Chen Luo, Yanxin Yang, Yang Yi, Jianjian Wu
Summary: A new in-soil tensile test apparatus was developed to simulate the in-soil stress condition of geosynthetics in a real working state. Tensile tests were conducted with or without friction, as well as in-air tests, to evaluate the tensile properties of geosynthetics under different confining stresses. The results showed that confinement played a major role in improving the tensile properties of geosynthetics compared to reinforcement-soil friction.
Article
Mathematics
Peng Xiao, Guoyan Zhao, Huanxin Liu
Summary: This paper simulates the fracture process of granite discs under different loading configurations using a coupled finite-discrete element method. The results show that the maximum tensile stress value is located within 18 mm of the vertical range of the disc center under different loading configurations. The small diameter rods loading results in invalid tensile strength, while flat platen loading and curved jaws loading can obtain valid tensile strength. The error of small diameter rods loading is 13%, while the errors of flat platen loading and curved jaws loading are both 1%. Curved jaws loading is the most suitable method for measuring the tensile strength of brittle materials.
Article
Engineering, Geological
Xiaohan Li, Zheming Zhu, Meng Wang, Yun Shu, Shuai Deng, Dingjun Xiao
Summary: This study investigates the influence of blasting load directions on the stability of a tunnel with a pre-crack nearby in fractured rock masses. Blasting tests and numerical simulations were conducted to analyze the failure modes of the tunnels. The results show that blasting load directions significantly affect the ultimate failure mode of the tunnel, which is significant for tunnel stability analysis and support scheme optimization.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2022)
Article
Construction & Building Technology
Hao Qiu, Binglun Chen, Fei Wang, Feiyu Liao, Meng Wang, Duanying Wan
Summary: In this study, the mechanical properties of the mortar-rock interface were investigated using a split Hopkinson pressure bar (SHPB) experiment and numerical simulation. The results showed that the interface crack growth rate in the BSCT specimen was lower than the waves in the M40 mortar, and as the loading rate increased, the fracture properties of all specimens were significantly improved, especially for the specimens with rough interfaces.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Computer Science, Interdisciplinary Applications
Yun Shu, Zheming Zhu, Meng Wang, Peng Ying, Fei Wang, Duanying Wan, Xiaohan Li, Weiting Gao
Summary: This paper presents a new constitutive model that accurately describes the interactive mechanism of damages caused by different types of dynamic loads. The numerical validations and comparison with experimental data show that the model is suitable and accurate for simulating the behavior of rock-like materials under impact and blast loads.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Materials Science, Multidisciplinary
Yun Shu, Zheming Zhu, Meng Wang, Fei Wang, Li Ren, Yaojia Li
Summary: Rock fragmentation by blasting is a commonly used method in geotechnical engineering. The M-JH2 model has been developed to describe the rock damage process, and it improves the JH2 model in terms of strain hardening, gradual softening, and tensile-compressive damage asymmetry.
MECHANICS OF MATERIALS
(2022)
Article
Engineering, Mechanical
Weiting Gao, Zheming Zhu, Peng Ying, Yaojia Li, Hao Qiu, Meng Wang, Lei Zhou
Summary: This study investigated the dynamic fracture mechanism and physical parameters of sandstone under high temperature environment. Physical parameter measurements and dynamic loading tests were conducted, showing that temperature has a significant impact on the physical parameters of sandstone. The main mineral components of sandstone undergo thermochemical reactions, leading to deterioration. The dynamic fracture test results indicate that temperature affects the dynamic crack initiation time, crack speed, and dynamic fracture toughness of sandstone.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Engineering, Mechanical
Zhihong Wang, Meng Wang, Lei Zhou, Zheming Zhu, Yun Shu, Tao Peng
Summary: The mechanical properties and failure modes of stratified rock mass are crucial for solving problems in engineering protection and construction. This study reveals the relationship between the strength difference of lithological units and the overall uniaxial compressive strength in stratified rock mass, as well as investigates the crack initiation, propagation behavior, and different failure modes. The findings provide valuable references for further decision-making on cracking problems.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Engineering, Mechanical
Xianshang Zhang, Leijun Ma, Zheming Zhu, Lei Zhou, Meng Wang, Tao Peng
Summary: This study conducted dynamic fracture tests on rock specimens using the split Hopkinson pressure bar (SHPB) device to reveal the energy and stress evolution during rock dynamic fracture. Experimental results showed a physical pseudo-healing of the crack after its short closure under impact loads, and the dissipated energy exhibited a slow decrease after reaching a peak.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Engineering, Mechanical
Xiaolin Song, Xuanran Fu, Meng Wang
Summary: Resource conservation and environmental protection have made lightweight materials like magnesium alloys essential for rail transit. This study investigates the structure and properties of the beta ' phase in Mg-RE (RE = Y, Gd, Tb, or Dy) alloys using first-principles calculations. The results show that these alloys are thermodynamically and mechanically stable, and the addition of RE improves their elastic moduli, especially Young's modulus. Moreover, Mg-RE alloys exhibit better hardness and elastic anisotropy compared to α-Mg, due to the strong metallic bonds between RE and Mg atoms.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Chemistry, Multidisciplinary
Yongli Hou, Jiabing Zhang, Bin Li, Yifei Gong, Yingze Xu, Meng Wang, Chun Zhu
Summary: This study constructed an analytical method of sized slate stability based on the equivalent support stiffness method and carried out a stability analysis of the roof slab of Yuanjue Cave. The study revealed the stress and deformation characteristics of the roof slab and identified the main factors affecting its stability. The research provides a reliable reference basis for the stability analysis and evaluation of cave temple roof slabs in China's Sichuan and Chongqing areas.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Geological
Duanying Wan, Meng Wang, Zheming Zhu, Yuntao Wang, Hu Xiao, Weiting Gao
Summary: In this study, a coupled material point model (MPM) based on aGIMP and CPDI-Tet4 was established to simulate the dynamic splitting of a rock Brazilian disc under small deformation. A boundary-based contact algorithm was developed to accurately describe the contact force between the split bar's aGIMP particles and the rock's CPDI-Tet4 particles. The aGIMP technology enabled particles to move on a non-uniform background grid, resulting in a good simulation effect. The rock particle size was found to play an important role in the accuracy of the contact algorithm.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Engineering, Mechanical
Hao Qiu, Rongyuan Chen, Weiquan Zheng, Haopeng Lai, Meng Wang, Changlin Zhou, Fei Wang
Summary: This study investigates the dynamic fracture of composite interfaces using different interface trajectories. The crack extension speed is strongly influenced by interface trajectory, with significant attenuation features under specific patterns. The tensile stress dominates crack initiation, and the K1 value is critical in determining interfacial cracking.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Chemistry, Multidisciplinary
Junwei Zhang, Duanying Wan, Weiting Gao, Lei Zhou, Meng Wang
Summary: This study investigates the overall stability of cracks with various angles during fixed borehole blasting. The results show that pre-existing cracks from different angles impact both the blast hole and the newly generated cracks. These special cracks, with faster growth rates and longer lengths, are more prone to connecting with the free surface or other cracks, resulting in overall instability. The research findings have certain guiding significance for the stability analysis and hazardous area prediction of tunnel blasting with existing cracks.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Multidisciplinary
Yunfei Gao, Guogui Huang, Yinxi Li, Junyuan Zhang, Zeng Yang, Meng Wang
Summary: This study proposes a framework that utilizes Bayesian Optimized Back Propagation Artificial Neural Network (BP-ANN) to predict the homogenized mechanical parameters of soils, addressing the issue of high computational costs in existing methods.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Physical
Haijun Yu, Ming Zou, Jinshan Sun, Yuntao Wang, Meng Wang
Summary: The length of pre-cracks critically affects the initiation and propagation mechanism of cracks. P-waves and S-waves are crucial in models with short pre-cracks, while Rayleigh waves significantly contribute to crack propagation in models with long pre-cracks.
Article
Engineering, Mechanical
Haijun Yu, Chunhong Xiao, Jinshan Sun, Yuntao Wang, Meng Wang
Summary: This paper presents a method of determining dynamic fracture parameters of rocks using a blasting experimental measuring system and analyzes the mechanical behavior and fracture mechanism of rocks under blasting through numerical models. The results show that there is a certain relationship between dynamic tensile strength, fracture energy, crack initiation time, and propagation velocity.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Construction & Building Technology
Qi Jiang, Wei Liu, Shaopeng Wu, Xuanwen Gou
Summary: This study analyzes the erosion mechanisms of NaCl solution on asphalt concrete and finds that NaCl solution softens asphalt and promotes the intrusion of crystalline salt into it. Salt crystallization alters the surface roughness of aggregates, resulting in a decrease in skid resistance but an improvement in compressive strength. Additionally, the concentration of NaCl solution initially has no significant impact on the mechanical performance of asphalt concrete, but its domination gradually increases with the intensification of cyclic effects.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Lili Kan, Lan-qing Dai, Ning Kong, Bin Peng, Fei Wang
Summary: This paper investigates the effect of freezing and thawing cycles on the tensile behavior of cracked ultra-high performance concrete (UHPC). The results show that long-term freezing and thawing action deteriorates the cracking strength, tensile strength, tensile strain, and strain energy of cracked UHPC. On the other hand, the action of water generally favors the development of tensile properties of UHPC. The crack distribution tends to be unsaturated under freezing and thawing environment, and the re-hydration reaction is hindered. The pore structure near the crack varies under different environments.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Xin Xiao, Jingwei Li, Qingke Meng, Xiangshan Hou, Yanhui Liu, Xujiang Wang, Wenlong Wang, Shengtao Lu, Yuzhong Li, Yanpeng Mao, Tong Li
Summary: Preparing gypsum-based self-leveling mortar (GSLM) using beta-hemihydrate gypsum and solid wastes-derived sulfoaluminate cement (WSAC) can improve the mechanical performance of the mortar, but phosphorus impurities can weaken the hydration speed and degree.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Sihang Bao, Junzhen Di, Yanrong Dong, Ziqing Gao, Qing Gu, Yuanfang Zhao, Hongyu Zhai
Summary: Tailings dam break and leakage accidents pose a threat to the safety of people in mining areas and cause severe environmental pollution. This study focuses on solidifying tailing sand using microbial induced calcite precipitation (MICP) to improve strength and fix heavy metals. The curing time of MICP bio-cemented tailings is found to significantly impact the strength of tailings, while its effect on heavy metal fixation is minimal. The optimized MICP curing time is 10 days, resulting in improved strength and cementation of tailings particles.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Ferhat Benmahiddine, Fares Bennai, Achraf Charaka, Ameur El Amine Hamami, Abdelkader Tahakourt, Rafik Belarbi
Summary: This paper studied the effects of hysteresis on the hygrothermal behavior at the building scale. Through laboratory validation and numerical simulations, it was found that hysteresis has a significant impact on the relative humidity and total heat fluxes in buildings, while it does not have a noticeable effect on temperature variations.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
You Gao, Wei He, Xiayang Zhang, De'an Sun, Pei Li
Summary: This study determined the boundary line between the swelling and compression deformation zone in lateritic clay through wetting tests, and proposed a simple bimodal SWRC model. It also found that the existing strength model underestimated the tested values in the medium to high suction range, therefore a segmented strength equation was introduced for enhanced predictions of the strength properties of lateritic clay.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Prabhath Ranjan Kumar Soda, Asheer Mogal, Kalyan Chakravarthy, Nikhil Thota, Nimish Bandaru, Sanjay Kumar Shukla, K. M. Mini
Summary: This study investigates the use of encapsulated bacteria to improve the self-healing ability of concrete. Through various tests, it is found that using 20% cement-coated alginate beads (CCAB) and 5% nanosilica (NS) can achieve optimal strength and healing. This research is significant for enhancing the durability of concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Shizhe Wang, Haiping Wu, Wen Yang, Wei Wang, Zhibo Zhu, Kun Nie, Luoxin Wang, Hua Wang, Jing Wu
Summary: In this study, photothermal-heat storage concrete (PHSC) was developed with excellent photothermal conversion performance and heat storage capacity. By absorbing and storing solar energy during the day and releasing it at night, PHSC can effectively reduce energy consumption in buildings.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Robin Deb, Jialuo He, Geetika Mishra, Yaghoob (Amir) Farnam
Summary: Incorporation techniques of phase change materials in cementitious composites have a significant influence on thermal properties. This study investigated the thermal behavior of low-temperature PCM when subjected to varying temperature change rates and pore confinement inside the porous network of lightweight aggregates. The results showed that ramp rates affect the nucleation and crystallization growth process during the phase transition, and the pore structure of the aggregates affects the supercooling phenomenon and confinement pressure of the PCM.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Eduardo Ferreira, Payam Sotoudeh, Dagmar Svecova
Summary: This study investigates the fatigue behavior of concrete under different stress reversal conditions. The results indicate that stress reversal generally causes more severe damage and reduces the cycles to failure compared to tensile fatigue. Additionally, adding some level of compression contributes to the energy required for failure under stress reversal fatigue. Specimens with higher concentration of fractured aggregates achieve longer fatigue lives.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Mag Raj Gehlot, Sandeep Shrivastava
Summary: This study evaluates the compatibility relationship between plaster bonds and the substrate under an accelerated aging environment, and finds that incorporating an appropriate amount of granite cutting waste can improve the strength parameters and adhesion of the cement mortar.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Min Zhang, Qirui Luo, Mingke Deng, Shixing Zhao
Summary: This study investigated the bond behavior between carbon FRCM composites with added short fibers and concrete substrates. The effects of different factors were considered and 36 specimens were tested and discussed. The experimental results were analyzed in terms of failure mode, load-slip curve, and characteristic parameters, and the contribution of weft yarns was taken into account in the developed bondslip model.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Dengkai Liu, Hongniao Chen, Ray Kai Leung Su
Summary: The susceptibility of building stones to fire and high temperature was investigated in this study by examining their physical and mechanical properties. The results show that both compressive and tensile properties of stones are affected by temperature changes. The tensile strength is particularly sensitive to temperature changes, requiring special attention to the components subjected to tensile stress in stone buildings. Principal component analysis was used to predict the mechanical properties of stones, providing a new method for calculating the residual mechanical properties after high temperature or fire.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Joso Maria Raposo, Eduardo Cavaco, Luis Costa Neves, Eduardo Julio
Summary: This paper investigates the correlation between the friction coefficient and the surface roughness of concrete-to-concrete interfaces. Experimental tests were performed on specimens with different surface treatments, and the surface roughness parameters were analyzed and correlated with the shear strength and friction coefficient. The results showed that certain roughness parameters had a strong positive correlation with the friction coefficient, while others had little or no correlation. A novel combined roughness parameter with optimized correlation was proposed.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Chiara Riccardi, Massimo Losa
Summary: The interest in using bio materials in asphalt pavements is growing due to economic reasons and environmental benefits. This study aimed to review the use of bio extenders as additives in binders, with a focus on replacements greater than 20% of fossil binder. The properties of bio-extended binders were found to vary substantially depending on the biomass source and production process.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
