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Applied Sciences
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Ultra-High Performance Concrete (UHPC): Preparation, Properties and Applications
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Ultra-High Performance Concrete (UHPC): Preparation, Properties and Applications

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Civil Engineering".

Deadline for manuscript submissions: closed (31 March 2023) | Viewed by 8587

Special Issue Editors

Prof. Dr. Peng Liu

E-Mail Website
Guest Editor
School of Civil Engineering, Central South University, Changsha 410004, China
Interests: materials; civil engineering; durability
Special Issues, Collections and Topics in MDPI journals
Dr. Ying Chen

E-Mail Website
Guest Editor
School of civil engineering, Central South Univeirsity of Forestry and Technology, Changsha 410004, China
Interests: mechanical property; durability; ultra-high performance of mortar; cementious materials

Special Issue Information

Dear Colleagues,

Compared with normal concrete, ultra-high performance concrete (UHPC) is considered to be a new development of concrete technology with excellent workability, high compressive strength, toughness, and long durability, etc. The UHPC has been widely used in bridge engineering, super high building and long-span structures, and so on. Recently, the UHPC made of superplasticizers, silica fume, and steel fibers has been widely used to construct the super-high building structure, long span bridge, subsea tunnel. Plenty of researches have been carried out to discuss the preparation and performances of UHPC. Therefore, the UHPC has both important academic meaning and engineering value. The research scope of this special issue can be the mix proportion of concrete, material compositions, mechanical properties, preparation technology and methods, long term performance, water to cement ratio, type and content of fibers, dosage of cementitious materials, mechanical and rheological properties of UHPC, and so on.

Prof. Dr. Peng Liu
Dr. Ying Chen
Guest Editors

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. Applied Sciences 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 2400 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.

Published Papers (4 papers)

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Research

17 pages, 6465 KiB  
Article
Study on the Structural Performance of UHPC Pavement and Hinge Joint Reinforcement for Hollow Slab Girder Bridges
by Wenya Ye and Fangyuan Li
Appl. Sci. 2022, 12(23), 12008; https://doi.org/10.3390/app122312008 - 24 Nov 2022
Cited by 1 | Viewed by 1319
Abstract
To address the problem of structural performance degradation caused by hinged joints and pavement damage, we utilized actual engineering to conduct a construction study on the overall replacement of pavement and hinge joint reinforcement in ultra-high-performance concrete (UHPC) hollow slab girder bridges. A [...] Read more.
To address the problem of structural performance degradation caused by hinged joints and pavement damage, we utilized actual engineering to conduct a construction study on the overall replacement of pavement and hinge joint reinforcement in ultra-high-performance concrete (UHPC) hollow slab girder bridges. A replacement and reinforcement design was developed and reconstruction was undertaken. By using UHPC and reinforcement bars, the adjacent slab girders were designed to work together under specific construction process guarantees for the characteristics of UHPC. The corresponding interface treatment and a combination of planting bars and steel mesh were necessary. According to the strain and deflection monitoring results, the overall performance of the bridge after pavement and hinge joint reinforcement was verified. The strain amplitude of the reinforcement was approximately 10 με, and that of the concrete was approximately 5 με. The deflection difference of the adjacent girder was similar, which proved that the hinge joints connect girders and transfer force effectively. All the results clearly demonstrated the positive overall effect of the UHPC replacement method. The conclusions could provide a reference for the reinforcement and reconstruction of similar projects. Full article
(This article belongs to the Special Issue Ultra-High Performance Concrete (UHPC): Preparation, Properties and Applications)
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16 pages, 7138 KiB  
Article
Experimental and Numerical Study on UHPC–RC Decks within Hogging Moment Region
by Guanxu Long, Ruigen Zhou, Haiying Ma, Gongfeng Xin, Seyyedbehrad Emadi and Xuefei Shi
Appl. Sci. 2022, 12(22), 11446; https://doi.org/10.3390/app122211446 - 11 Nov 2022
Cited by 1 | Viewed by 1019
Abstract
Steel–concrete composite continuous bridges can take full advantage of concrete and steel, but in regions with hogging moments, cracking of the concrete deck is a big issue affecting the durability of bridges. In order to solve cracking problems within the hogging moment region, [...] Read more.
Steel–concrete composite continuous bridges can take full advantage of concrete and steel, but in regions with hogging moments, cracking of the concrete deck is a big issue affecting the durability of bridges. In order to solve cracking problems within the hogging moment region, this study proposes a composite deck method using ultra-high-performance concrete (UHPC) and regular concrete (RC). In this way, the layers of UHPC and RC are composited to take advantage of the high tensile strength of UHPC materials to improve the anti-crack performance of the concrete deck within the hogging moment region. Four different specimens were designed to account for different layer thickness of UHPC. Bending experiments of the UHPC–RC composite deck were undertaken and a corresponding finite element model was established to study the behavior of the UHPC–RC composite deck. The regularity of crack development in different UHPC layer thicknesses was revealed, and the load-displacement results were compared to investigate the ultimate capacity of a steel–concrete composite bridge structure using a UHPC–RC composite deck. Finally, with consideration of material cost, a reasonable UHPC layer thickness suitable for the composite deck was obtained to provide a reference for the design of a UHPC–RC composite deck. Full article
(This article belongs to the Special Issue Ultra-High Performance Concrete (UHPC): Preparation, Properties and Applications)
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20 pages, 7865 KiB  
Article
Bonding Performance of Steel Rebar Coated with Ultra-High-Performance Concrete
by In-Hyeok Eom, Sang-Keun Oh and Byoungil Kim
Appl. Sci. 2022, 12(13), 6808; https://doi.org/10.3390/app12136808 - 05 Jul 2022
Cited by 2 | Viewed by 3356
Abstract
In this study, to improve the bond performance of reinforcing bars fixed inside concrete, a pullout test using ultra high-performance concrete (UHPC) and structural steel fibers was conducted and a model that could predict the performance was also presented. After creating a UHPC [...] Read more.
In this study, to improve the bond performance of reinforcing bars fixed inside concrete, a pullout test using ultra high-performance concrete (UHPC) and structural steel fibers was conducted and a model that could predict the performance was also presented. After creating a UHPC layer on the rebar surface, the specimens were prepared along with three types of structural fibers. The structural fibers with different shapes were mixed up to 0.2%, 0,4%, 0.6%, 0.8%, 1% and 2% to analyze their effects on the bond failure at the interface. As a result of the experiment, the pullout resistance ability of the specimen thinly coated with UHPC maintained high residual stress due to the steep section reaching the maximum load, increased the maximum pullout load, and delayed the bond failure during the extraction process. As a result of the cross-sectional examination of the specimen, the coating of UHPC was strongly attached to the rebar surface and the bond surface was broken through sliding at the interface (UHPC–ordinary Portland concrete (OPC)). It was found that the increase in the structural fiber significantly improved the pulling-out resistance at the interface. The proposed model based on the existing Cosenz–Manfredi–Realfonzo (CMR) and Bertero–Popov–Eligehausen (BPE) prediction models was found to be in good agreement with the experimental results. Full article
(This article belongs to the Special Issue Ultra-High Performance Concrete (UHPC): Preparation, Properties and Applications)
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18 pages, 6688 KiB  
Article
Study of Bag Grouting Pile Reinforcing Deep Soft-Soil Foundation with an Interlayer of Hard Materials on High-Speed Railway Ballast Track
by Shen Zuo, Qingyu Zhang, Jin Li, Peng Liu, Fengkun Cui and Ying Chen
Appl. Sci. 2022, 12(9), 4662; https://doi.org/10.3390/app12094662 - 06 May 2022
Cited by 2 | Viewed by 1899
Abstract
High-speed railways are built in deep soft-soil foundations interlayered with hard materials. However, the hard layers cannot be penetrated by conventional foundation treatment. Moreover, the project cost is sometimes prohibitive, which is an issue for post-construction subsidence control. The bag grouting pile is [...] Read more.
High-speed railways are built in deep soft-soil foundations interlayered with hard materials. However, the hard layers cannot be penetrated by conventional foundation treatment. Moreover, the project cost is sometimes prohibitive, which is an issue for post-construction subsidence control. The bag grouting pile is a special grouting-pile-reinforcement technique for treating soft-soil foundations interlayered with hard materials. This paper conducted tests on the Ningbo-Taizhou-Wenzhou ballast track passenger railway, combining a conventional mixing-pile-foundation (not through hard layer) processing station and the bag-grouting-pile-processing subgrade line. Using field tests combined with numerical calculation, the lateral displacement, settlement and pile–soil stress were tested to obtain the working properties of the grouting-pile-composite foundation. The variation in the law of lateral displacement, settlement, and pile–soil stress of the foundation was studied. The results showed that the post-construction subsidence of bag-grouting-pile- and conventional mixing-pile-foundation control was less than 15 cm and 30 cm, respectively, which met the design requirements. The results also showed that the design scheme was reasonable (load-sharing ratio of bag-pile-foundation pile soil-based test was reasonable). The numerical calculation showed a change in pile diameter. It also showed that pile spacing could not improve subsidence-control properties, bag grouting pile can promote pore-pressure dissipation and accelerate consolidation, and pile spacing can be increased to cut project costs incurred by the pile-bearing capacity. Full article
(This article belongs to the Special Issue Ultra-High Performance Concrete (UHPC): Preparation, Properties and Applications)
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