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Recent Advances in Concrete Technologies
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Recent Advances in Concrete Technologies

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

Deadline for manuscript submissions: closed (15 April 2022) | Viewed by 8327

Special Issue Editor

Prof. Dr. Khan Mohammad Iqbal

E-Mail Website
Guest Editor
1. Department of Civil Engineering &Managing Director, Center of Excellence for Concrete Research & Testing College of Engineering, King Saud University, Riyadh 11421, Saudi Arabia 2. Department of Civil, Architecture, Environmental and Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA
Interests: cement-based and polymer-based fiber-reinforced composites; sustainability and environmental impact; supplementary cementitious materials; nano- and micromechanics of composite materials; nanostructure and microstructure of cement and concrete; self-compacting concrete; prediction modeling
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Concrete is the largest manufactured material globally and it consumes more than 6 billion metric tons of materials annually. The quality and performance of concrete play a vital role in the future challenges and needs of global infrastructure to grow economically.  To compile comprehensive documentation of the recent advances in the field of concrete, the Special Issue “Recent Advances in Concrete Technologies” is dedicated to highlighting advances and innovative research in the field of concrete technology and its applications. It will provide an international forum for the dissemination of innovative and original research and development in the field of concrete technologies. The scope of this special issue includes, but is not restricted to, cement and concrete materials, properties of mortar and concrete, fresh and hardened concrete, durability issues, nano- and micro-structures, new materials, fiber reinforcement, cementitious composites, engineered materials, strain hardened materials, smart materials, sustainability and durability, environmental impact, additives, corrosion technology, waste and recycled materials, non-conventional building materials. Including the applications and monitoring in bridges, high-rise buildings, civil engineering structures, highway pavements, tunnels, dams, water containment structures etc.

Prof. Dr. Khan Mohammad Iqbal
Guest Editor

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Keywords

  • concrete technology
  • fiber reinforcement
  • cementitious composites
  • additives
  • corrosion technology
  • waste and recycled materials
  • engineered materials
  • strain hardened materials
  • smart materials
  • sustainability and environmental impact

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Published Papers (3 papers)

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Research

21 pages, 8970 KiB  
Article
Behavior of Non-Shear-Strengthened UHPC Beams under Flexural Loading: Influence of Reinforcement Percentage
by Mohammad Iqbal Khan, Galal Fares, Yassir M. Abbas and Fahad K. Alqahtani
Appl. Sci. 2021, 11(23), 11346; https://doi.org/10.3390/app112311346 - 30 Nov 2021
Cited by 9 | Viewed by 2300
Abstract
In the present work, the structural responses of 12 UHPC beams to four-point loading conditions were experimentally and analytically studied. The inclusion of a fibrous system in the UHPC material increased its compressive and flexural strengths by 31.5% and 237.8%, respectively. Improved safety [...] Read more.
In the present work, the structural responses of 12 UHPC beams to four-point loading conditions were experimentally and analytically studied. The inclusion of a fibrous system in the UHPC material increased its compressive and flexural strengths by 31.5% and 237.8%, respectively. Improved safety could be obtained by optimizing the tensile reinforcement ratio (ρ) for a UHPC beam. The slope of the moment–curvature before and after steel yielding was almost typical for all beams due to the inclusion of a hybrid fibrous system in the UHPC. Moreover, we concluded that as ρ increases, the deflection ductility exponentially increases. The cracking response of the UHPC beams demonstrated that increasing ρ notably decreases the crack opening width of the UHPC beams at the same service loading. The cracking pattern the beams showed that increasing the bar reinforcement percentages notably enhanced their initial stiffness and deformability. Moreover, the flexural cracks were the main cause of failure for all beams; however, flexure shear cracks were observed in moderately reinforced beams. The prediction efficiency of the proposed analytical model was established by performing a comparative study on the experimental and analytical ultimate moment capacity of the UHPC beams. For all beams, the percentage of the mean calculated moment capacity to the experimentally observed capacity approached 100%. Full article
(This article belongs to the Special Issue Recent Advances in Concrete Technologies)
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20 pages, 4826 KiB  
Article
Behavior of Non-Shear-Strengthened UHPC Beams under Flexural Loading: Influence of Reinforcement Depth
by Mohammad Iqbal Khan, Galal Fares and Yassir M. Abbas
Appl. Sci. 2021, 11(23), 11168; https://doi.org/10.3390/app112311168 - 25 Nov 2021
Cited by 12 | Viewed by 1816
Abstract
This study was carried out in order to study the flexural behavior of fiber-reinforced ultra-high-performance concrete (UHPC) containing hybrid microsteel straight fibers and natural fine aggregates under four-point flexural loading. The experimental results revealed that the fiber pullout mechanism had a progressive pullout [...] Read more.
This study was carried out in order to study the flexural behavior of fiber-reinforced ultra-high-performance concrete (UHPC) containing hybrid microsteel straight fibers and natural fine aggregates under four-point flexural loading. The experimental results revealed that the fiber pullout mechanism had a progressive pullout (collapse) mode. A highly flexural crack developed when the fiber pulling mechanism was explicitly triggered, leading to the failure of most beams. The maximum load in beams reinforced by 1.2, 1.6, and 2.0% exceeded that in beams without longitudinal reinforcement by 56, 73, and 94%, respectively. Further, bar reinforcements at 125, 115, 95, 85, and 75 mm depths led to increases of 56, 55, 73, 96, and 94% in beam load capacity, respectively. In addition, bar reinforcement at 115, 95, 85, and 75 mm depths reduced the beams’ ductility by 40, 23, 35, and 39% compared to those with 125 mm depth. All studied UHPC beams had an uncracked phase that extended to a curvature of about 7.5 × 10−6 rad, which occurred at about 10 kNm. The use of the design of experiments was exploited in this investigation to develop a prediction model for the ultimate moment capacity of UHPC beams. This prediction model took into account the sectional and material properties of UHPC beams. To carry out this analysis, a database of 25 beams, developed by other investigators, as well as the present authors, was utilized. With a mean prediction-to-test ratio of 0.92, this prediction model had a reasonable performance capacity. In turn, this model was used to generate isoresponsive surface contours that could be used for UHPC beam design. Full article
(This article belongs to the Special Issue Recent Advances in Concrete Technologies)
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17 pages, 6697 KiB  
Article
Structural Behavior of Composite Floor System Using Cold-Formed Thin-Walled C Steel Channel Embedded Foam Concrete
by Dianzhong Liu, Feng Fu and Wanjuan Liu
Appl. Sci. 2021, 11(21), 9888; https://doi.org/10.3390/app11219888 - 22 Oct 2021
Cited by 3 | Viewed by 2530
Abstract
In this paper, a new composite floor system using cold-formed thin-walled C steel channel embedment and a foam concrete slab is developed. This new type of floor system features lightweight, high fire-resistant, and high anti-corrosion features, and can be used for multi-story buildings, [...] Read more.
In this paper, a new composite floor system using cold-formed thin-walled C steel channel embedment and a foam concrete slab is developed. This new type of floor system features lightweight, high fire-resistant, and high anti-corrosion features, and can be used for multi-story buildings, providing a promising new alternative floor system for the construction market. Two four-point bending tests were carried out to investigate the flexural capacity and failure modes of this new type of composite slab. Based on the test results, a nonlinear finite element model was developed using general software package ABAQUS. The model is validated using the test results. Using this model, parametric studies were performed to study the key parameters affecting the structural behavior of this new type of composite floor system. Different parameters such as density of the foam concrete, grade of the cold-formed thin-walled C steel channel embedment, and spacing of the cold-formed thin-walled C steel channel were investigated. Their contributions to the overall moment capacity and their effect on the failure modes of this type of composite slab were discovered. Based on experimental results and FE results, design formulas for ultimate flexural capacity of this new type of composite slabs were also developed which can accurately predict their flexural capacity. Full article
(This article belongs to the Special Issue Recent Advances in Concrete Technologies)
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