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Research of Mechanical Behavior of Eco-Friendly/High-Performance Cement and Concrete Composites

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

Deadline for manuscript submissions: closed (10 January 2024) | Viewed by 3963

Special Issue Editor

Department of Architecture Engineering, Chungnam National University, Daejeon 34134, Korea
Interests: cement; cement composites; concrete; mechanical behavior
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The aim of the special issue “Research of Mechanical behavior of eco-friendly/high-performance cement and concrete composites” is to publish the research on the performance of cement-based construction and building materials.

This issue covers a wide range of eco-friendly/high-performance cement and concrete composite materials such as cement composites using waste materials, recycled materials, hybrid fiber-reinforced cement composites, polymer cement composites, novel concrete, and so on.

And, the mechanical behavior of cement and concrete, including (but not restricted to): fundamental physical properties, mechanical properties, durability, fracture mechanics, corrosion technology, and applications for eco-friendly/high-performance cement and concrete composites.

This special Issue will focus on papers with a broad interest, based on their subject area, the quality of the research, the novelty of the results which can advance the role of eco-friendly/high-performance cement and concrete composites.

Prof. Dr. Gyuyong Kim
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

  • cement
  • cement composites
  • concrete
  • mechanical behavior
  • fiber reinforcement
  • recycled materials

Related Special Issue

Published Papers (4 papers)

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Research

14 pages, 112178 KiB  
Article
Influence of Unit Water Content Control on Concrete Performance in the Ready-Mixed Concrete Production Process
by Sang-Hoon Park, Hwa-Sung Ryu and Won-Jun Park
Materials 2024, 17(4), 834; https://doi.org/10.3390/ma17040834 - 09 Feb 2024
Cited by 1 | Viewed by 455
Abstract
This study examined the effects of increasing concrete unit water content and artificially controlling water content on concrete performance in the production process of ready-mixed concrete. Results showed that changes in the unit water content of 20 concrete mix proportions without air-entraining significantly [...] Read more.
This study examined the effects of increasing concrete unit water content and artificially controlling water content on concrete performance in the production process of ready-mixed concrete. Results showed that changes in the unit water content of 20 concrete mix proportions without air-entraining significantly reduced concrete compressive strength, increased porosity, and in-creased occurrence of bleeding. A unit water content increase of 25 kg/m3 or more may reduce the compressive strength of concrete below the design standard and significantly affect the occurrence of bleeding water. Moreover, an extra unit water content of at least 25 kg/m3 could significantly affect the diffusion of chloride ions in the concrete. The carbonation depth of concrete was extremely high with the increase in unit water content and water addition. In the production of concrete requiring at least normal strength or durability, the extra water change to total unit water content should be maintained at 15 kg/m3 or less. And a water–cement ratio of 48% or less and a unit water content of 155 kg/m3 or less are considered effective for management of concrete quality. Considering the aggregate type, absorption rate, and moisture state, the management of unit water content error in concrete production processes requires greater. Full article
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21 pages, 4702 KiB  
Article
Experimental Study and Analytical Modeling on Properties of Freeze–Thaw Durability of Coal Gangue Pervious Concrete
by Yujing Wang, Junwu Xia, Pengxu Li, Linli Yu, Han Yang and Yidong Chen
Materials 2023, 16(22), 7104; https://doi.org/10.3390/ma16227104 - 09 Nov 2023
Cited by 2 | Viewed by 688
Abstract
To assess the freeze–thaw (F-T) durability of coal gangue pervious concrete (CGPC) in different F-T cycle media (water, 3.5 wt% NaCl solution), experimental studies on 36 groups of cube specimens and 6 groups of prismatic specimens were carried out, with designed porosity, F-T [...] Read more.
To assess the freeze–thaw (F-T) durability of coal gangue pervious concrete (CGPC) in different F-T cycle media (water, 3.5 wt% NaCl solution), experimental studies on 36 groups of cube specimens and 6 groups of prismatic specimens were carried out, with designed porosity, F-T cycling media, and F-T failure times as variables. The changes in apparent morphology, mass, compressive behavior, relative dynamic elastic modulus, and permeability coefficient have been analyzed in detail. To predict the compressive strength after F-T cycles, a GM (1,1) model based on the grey system theory was developed and further improved into a more accurate grey residual–Markov model. The results reported that the cement slurry and coal gangue aggregates (CGAs) on the specimen surface continued to fall off as F-T cycles increased, and, finally, the weak point was fractured. Meanwhile, the decrease in compressive behavior and relative dynamic elastic modulus was gentle in the early phase of F-T cycles, and they gradually became faster in the later stage, showing a parabolic downward trend. The permeability coefficient increased gradually. When F-T failure occurred, specimen mass dropped precipitously. The F-T failure of CGPC was more likely to occur in 3.5 wt% NaCl solution, and the F-T failure times of samples were 25 times earlier than that of water. This study lays the foundation for an engineering application and provides a basis for the large-scale utilization of CGPC. Full article
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16 pages, 10463 KiB  
Article
Effect of Moisture Condition of Structural Lightweight Concretes on Specified Values of Static and Dynamic Modulus of Elasticity
by Lucyna Domagała and Kinga Sieja
Materials 2023, 16(12), 4299; https://doi.org/10.3390/ma16124299 - 10 Jun 2023
Cited by 1 | Viewed by 605
Abstract
The dynamic modulus of elasticity (Ed), specified by ultrasonic pulse velocity measurements, is often used, especially for concrete built into construction, to estimate the static modulus of elasticity (Ec,s). However, the most commonly used Equations for such [...] Read more.
The dynamic modulus of elasticity (Ed), specified by ultrasonic pulse velocity measurements, is often used, especially for concrete built into construction, to estimate the static modulus of elasticity (Ec,s). However, the most commonly used Equations for such estimations do not take into account the influence of concrete moisture. The aim of this paper was to establish this influence for two series of structural lightweight aggregate concrete (LWAC) varying in their strength (40.2 and 54.3 MPa) and density (1690 and 1780 kg/m3). The effect of LWAC moisture content turned out to be much more pronounced in the case of dynamic modulus measurements than for static ones. The achieved results indicate that the moisture content of the concrete should be taken into consideration in modulus measurements as well as in Equations estimating Ec,s on the basis of Ed specified by the ultrasonic pulse velocity method. The static modulus of LWACs was lower on average by 11 and 24% in relation to dynamic modulus, respectively when measured in air-dried and water-saturated conditions. The influence of LWAC moisture content on the relationship between specified static and dynamic moduli was not affected by the type of tested lightweight concrete. Full article
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19 pages, 17620 KiB  
Article
Crack Evaluation of Concrete Using Mechanochromic Sensor
by Sujeong Pyeon, Hongseop Kim, Gyeongcheol Choe, Myeongkyu Lee, Junseo Jeon, Gyuyong Kim and Jeongsoo Nam
Materials 2023, 16(2), 662; https://doi.org/10.3390/ma16020662 - 10 Jan 2023
Viewed by 1602
Abstract
In this study, the deformation of concrete materials was evaluated using a mechanochromic sensor that detects the discoloration reaction caused by deformation. This sensor was attached by applying the Loctite adhesive to both ends in the longitudinal direction. The process of applying tensile [...] Read more.
In this study, the deformation of concrete materials was evaluated using a mechanochromic sensor that detects the discoloration reaction caused by deformation. This sensor was attached by applying the Loctite adhesive to both ends in the longitudinal direction. The process of applying tensile stress to the specimens was videotaped, and the deformation and discoloration were examined through image analysis. The mechanochromic sensor was not affected by the finished surface condition, and the discoloration reaction was detected for a concrete material deformation level of up to 0.01 mm. The detected level was caused by the elongation of the sensor, and the discoloration compared with the initial color was identified. In addition, the integration behavior of the mechanochromic sensor under the deterioration of concrete members in cold areas and winter environments, as well as the discoloration reaction of the sensor in a low-temperature environment, was examined. It was found that the discoloration ability of the mechanochromic sensor exposed to a low-temperature environment was restored in 2 h after the end of the freeze–thaw test, and it was judged that the deformation and discoloration levels will be properly measured when the surface temperature of the sensor is restored to a room temperature of approximately 15 °C. This appeared to be due to the room temperature recovery of the dielectric spacer of the sensor and the deformation structure of the resonance condition. The sensor was also attached when diagonal cracks occurred in the concrete beam members to evaluate the strain and discoloration rate according to the deformation and discoloration levels. Accordingly, the cracks and deformation of the concrete materials were monitored using measured values from the discoloration of the mechanochromic sensors, and the possibility of measuring the crack width was reviewed only by real-time monitoring and imaging with the naked eye. Full article
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