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Mechanical Research of Reinforced Concrete Materials (2nd Edition)
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Mechanical Research of Reinforced Concrete Materials (2nd Edition)

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Construction and Building Materials".

Deadline for manuscript submissions: 20 October 2024 | Viewed by 4402

Special Issue Editor

Prof. Dr. Wei Wang

E-Mail Website
Guest Editor
Key Laboratory of Impact and Safety Engineering, Ministry of Education, Faculty of Mechanical Engineering and Mechanics, Ningbo University, Ningbo, China
Interests: reinforced concrete structures; dynamic mechanics of materials; blast effect; blast damage assessment; dynamics of structures
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Reinforced concrete (RC) is a principal construction material used for civilian and military buildings due to its superior material characteristics over steel and timber (e.g., higher durability, corrosion resistance, and fire resistance). These inherent properties of reinforced concrete make it suitable for the construction of most civil engineering structures, for example, bridges, dams, nuclear containment structures, protective/defense structures, and residential/embassy buildings. These important structures are always high-priority targets of terrorists. Concrete is a frequently used material subjected to intense dynamic loadings in civil and defense engineering, such as blast and impact loadings, which can induce high pressure, high strain rate, and large strain in concrete structures. The response of the structure becomes very complex due to the effects of high inertia, large strain rate, high temperature, and the travel of shock waves through the reinforced concrete. Although the mechanical behaviors of reinforced concrete have been a research theme tackled by many researchers through experimental and theoretical approaches for 200 years, an accurate and comprehensive description of the actual mechanical behavior exhibited by reinforced concrete at service and ultimate conditions remains a challenge in the field of structural engineering.

This Special Issue is aimed at soliciting contributions focused on characterizing the mechanical performance of reinforced concrete materials. The scope of papers includes theoretical, experimental, and numerical studies that assess the general deformation response, damage evolution, and failure morphology of ordinary and high-performance reinforced concrete materials under various loading conditions (e.g., quasi-static, dynamic, fatigue, and impact). Investigations of reinforced concrete structures’ impact/blast resistance and damage mechanism evolution, failure modes transition and energy absorption performance are also welcome.

It is my pleasure to invite you to submit a manuscript to this Special Issue. Full papers, communications, and reviews are all welcome.

Prof. Dr. Wei Wang
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • structural materials
  • mechanical behaviors
  • reinforced concrete structures
  • ordinary and high-performance reinforced concrete
  • impact/blast resistance
  • damage mechanism evolution
  • failure modes

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Published Papers (4 papers)

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Research

13 pages, 4593 KiB  
Article
Experimental Study on Durability and Bond Properties of GFRP Resin Bolts
by Mingan Lin, Fuming Zhang and Wei Wang
Materials 2024, 17(12), 2814; https://doi.org/10.3390/ma17122814 - 9 Jun 2024
Viewed by 520
Abstract
Glass fiber-reinforced polymer (GFRP) anchor bolts are a new type of high-performance nonmetallic anchor with significantly higher tensile strength, a lighter weight, better corrosion resistance, and a lower cost than steel bars. Therefore, exploring the durability and bonding performance of GFRP anchor systems [...] Read more.
Glass fiber-reinforced polymer (GFRP) anchor bolts are a new type of high-performance nonmetallic anchor with significantly higher tensile strength, a lighter weight, better corrosion resistance, and a lower cost than steel bars. Therefore, exploring the durability and bonding performance of GFRP anchor systems is of great importance for the structural design of protective engineering, especially in coastal environments. However, insufficient research has been conducted on the durability of GFRP resin bolts in seawater conditions, with no universal standard on the pullout testing of GFRP bolts. To study the durability and bonding performance of GFRP resin bolts, durability experiments were conducted in this work using artificial seawater, and the pullout tests were conducted using a large-scale concrete platform with different compressive strengths (21.2, 40.8, and 61.3 MPa). The results of the durability experiments indicated that the strength variations of the GFRP rods and epoxy resin materials in artificial seawater environments were less than 5%. Subsequently, indoor pullout tests using steel tubes filled with epoxy resin were conducted, and the test results indicated a critical anchor length value. Pullout tests of the GFRP resin bolts embedded in large-scale concrete blocks were also conducted with different strengths. According to the test results, all GFRP resin bolts embedded in the three concrete blocks with different compressive strengths exhibited rod fracture failure. The failure mode was not controlled via the compressive strength of the concrete blocks due to the high bonding strength between the resin and the rod, as well as between the resin and the concrete. Therefore, this GFRP resin anchor system could fully utilize the tensile strength of GFRP rods. This research offers significant practical value in verifying the safety and reliability of GFRP resin bolts in corrosive marine service environments, and it contributes to the application and development of GFRP materials in the engineering field, serving as a valuable reference for the structural design and further study of GFRP bolts. Full article
(This article belongs to the Special Issue Mechanical Research of Reinforced Concrete Materials (2nd Edition))
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27 pages, 11702 KiB  
Article
Enhancing UHPC Tensile Performance Using Polystyrene Beads: Significant Improvements and Mechanisms
by Lang-Kuo Guo, Li-Biao Chen, Zhi-Wei Chen and Jun-Yan Wang
Materials 2024, 17(11), 2479; https://doi.org/10.3390/ma17112479 - 21 May 2024
Viewed by 604
Abstract
This study investigates utilizing spherical polystyrene (PS) beads as artificial flaws to improve ultrahigh-performance concrete (UHPC) tensile performance using a uniaxial tensile test and explains the corresponding mechanisms by analyzing the internal material structure of UHPC specimens with X-ray CT scanning. With a [...] Read more.
This study investigates utilizing spherical polystyrene (PS) beads as artificial flaws to improve ultrahigh-performance concrete (UHPC) tensile performance using a uniaxial tensile test and explains the corresponding mechanisms by analyzing the internal material structure of UHPC specimens with X-ray CT scanning. With a hooked steel fiber volume fraction of 2%, three PS bead dosages were employed to study tensile behavior changes in dog-bone UHPC specimens. A 33.4% increase in ultimate tensile strength and 174.8% increase in ultimate tensile strain were recorded after adding PS beads with a volume fraction of 2%. To explain this improvement, X-ray CT scanning was utilized to investigate the post-test internal material structures of the dog-bone specimens. AVIZO software was used to analyze the CT information. The CT results revealed that PS beads could not only serve as the artificial flaws to increase the cracking behavior of the matrix of UHPC but also significantly optimize the fiber orientation. The PS beads could serve as stirrers during the mixing process to distribute fiber more uniformly. The test results indicate a relationship between fiber orientation and UHPC tensile strength. Full article
(This article belongs to the Special Issue Mechanical Research of Reinforced Concrete Materials (2nd Edition))
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17 pages, 11426 KiB  
Article
Impact Resistance of Ultra-High-Performance Concrete Composite Structures
by Huijun Ning, Huiqi Ren, Wei Wang and Xiaodong Nie
Materials 2023, 16(23), 7456; https://doi.org/10.3390/ma16237456 - 30 Nov 2023
Cited by 6 | Viewed by 1542
Abstract
Ultra-high-performance concrete (UHPC) is a cement-based material with excellent impact resistance. Compared with traditional concrete, it possesses ultra-high strength, ultra-high toughness, and ultra-high durability, making it an ideal material for designing structures with impact resistance. The research on the impact resistance performance of [...] Read more.
Ultra-high-performance concrete (UHPC) is a cement-based material with excellent impact resistance. Compared with traditional concrete, it possesses ultra-high strength, ultra-high toughness, and ultra-high durability, making it an ideal material for designing structures with impact resistance. The research on the impact resistance performance of UHPC and its composite structures is of great significance for the structural design of protective engineering projects. However, currently, there is still insufficient research on the impact resistance performance of UHPC composite structures. To study the impact resistance performance, experiments were conducted on UHPC targets using high-speed projectiles. The results were compared with impact tests on granite targets. The results indicated that when subjected to projectile impact, the UHPC targets exhibited smaller surface craters compared with the granite targets, while the penetration depth was lower in the granite targets. Afterwards, the process of a projectile impacting the UHPC composite structure was numerically simulated using ANSYS 16.0/LS-DYNA finite element software. The numerical simulation results of penetration depth and crater diameter were in good agreement with the experimental results, which indicates the rationality of the numerical model. Based on this, further analysis was carried out on the influence of impact velocity, impact angle, and reinforcement ratio on the penetration depth of the composite structure. The results show that the larger the incident angle or the smaller the velocity of the projectile is, the easier it is to deflect the projectile. There is a linear relationship between penetration depth and reinforcement ratio; as the reinforcement ratio increases, the penetration depth decreases significantly. This research is of great significance in improving the safety and reliability of key projects and also contributes to the application and development of ultra-high-performance materials in the engineering field. Full article
(This article belongs to the Special Issue Mechanical Research of Reinforced Concrete Materials (2nd Edition))
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16 pages, 2470 KiB  
Article
Punching Shear Failure Analysis of Reinforced Concrete Slabs under Close-in Explosion
by Sheng Liu, Xiangyun Xu, Bukui Zhou and Kezhi Yang
Materials 2023, 16(18), 6339; https://doi.org/10.3390/ma16186339 - 21 Sep 2023
Viewed by 1083
Abstract
The susceptibility of reinforced concrete (RC) slabs to punching shear failure is heightened when subjected to close-in explosion loads, leading to a wider range of damage caused by the resultant leakage shock wave through the punching hole. Consequently, it is crucial to analyze [...] Read more.
The susceptibility of reinforced concrete (RC) slabs to punching shear failure is heightened when subjected to close-in explosion loads, leading to a wider range of damage caused by the resultant leakage shock wave through the punching hole. Consequently, it is crucial to analyze the conditions for punching shear failure and the size of the punching hole in RC slabs. This study investigates the punching shear failure of RC slabs under close-in explosions through numerical simulation and theoretical analysis. Initially, a finite element model is developed to examine the distribution of the explosion load on the slab’s surface. Subsequently, the critical explosion load for punching shear failure is determined using a damage criterion specific to RC slabs. Additionally, a calculation model based on the twin shear stress yield criterion is established to predict the punching hole’s radius. To validate the accuracy of this method, a comparison is conducted with existing test results. Full article
(This article belongs to the Special Issue Mechanical Research of Reinforced Concrete Materials (2nd Edition))
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