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

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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

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Research

Open AccessArticle

Effect of Moisture Condition of Structural Lightweight Concretes on Specified Values of Static and Dynamic Modulus of Elasticity

Lucyna Domagała

and

Kinga Sieja

Materials 2023, 16(12), 4299; https://doi.org/10.3390/ma16124299 - 10 Jun 2023

Viewed by 389

Abstract

The dynamic modulus of elasticity (E_d), specified by ultrasonic pulse velocity measurements, is often used, especially for concrete built into construction, to estimate the static modulus of elasticity (E_c,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 E_c,s on the basis of E_d 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

(This article belongs to the Special Issue Research of Mechanical Behavior of Eco-Friendly/High-Performance Cement and Concrete Composites)

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Open AccessArticle

Crack Evaluation of Concrete Using Mechanochromic Sensor

and

Materials 2023, 16(2), 662; https://doi.org/10.3390/ma16020662 - 10 Jan 2023

Viewed by 1097

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 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

(This article belongs to the Special Issue Research of Mechanical Behavior of Eco-Friendly/High-Performance Cement and Concrete Composites)

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