A meshless method for modeling the microscopic drying shrinkage cracking processes of concrete and its applications

Yu, Shuyang; Sun, Zhaohua; Qian, Wangping; Yu, Jun; Yang, Jie

doi:10.1016/j.engfracmech.2022.109014

Cited by 9 publications

(5 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When large deformations occur, it is challenging to maintain the nonsingularity and continuity of the mesh. Accordingly, a series of mesh-less simulation methods such as smoothed particle hydrodynamics(SPH) [103][104][105][106], cracking particle model (CPM) [107,108], and reproducing kernel particle method (RKPM) [109,110] are proposed. Due to the separation of constraints from meshes and elements, meshless methods are particularly suitable for studying oversized deformation and crack growth such as impact.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

Dynamic characteristics and crack evolution laws of coal and rock under split Hopkinson pressure bar impact loading

Sun

Jin

et al. 2023

Meas. Sci. Technol.

View full text Add to dashboard Cite

The aims of this paper are to comprehensively explore both the dynamic mechanical properties and crack evolution characteristics of coal and rock during impact failure. First, experimental specimens are prepared from coal seam, direct roof rock strata and direct floor rock strata in the same area to highlight the correlations between test pieces. Second, a dynamic strain gauge and high-speed (HS) camera are adopted to reflect the stress wave signal and crack evolution. Then, based on digital image correlation (DIC) technology and the mass screening method, the evolution laws of surface cracks during crushing and the distribution characteristics of sample fragments after crushing are studied from the perspective of fractal, and finally compared with those of the simulation analysis. The results are as follows. (1) The coal and rock samples from the same area have both consistency and differences. The dynamic mechanical properties of coal and rock are affected by the impact velocity and the physical properties of the specimen. Higher impact speeds and densities lead to the more obvious brittleness of the specimen when destroyed. Conversely, the sample shows more plasticity and ductile yield. (2) The self-similarity is significantly manifested in the evolution of surface cracks during impact and the distribution characteristics of fragments after impact. The box dimension and quality screening dimension are applicable to quantitatively characterize the evolution process and results of coal and rock fractures. (3) The simulation results based on the Holmquist–Johnson–Cook (HJC) and Riedel–Hiermaier–Thoma (RHT) constitutive models agree well with the experimental results, and the RHT constitutive model is more consistent. This study may contribute to a more comprehensive understanding of the dynamic characteristics and crack evolution laws of coal and rock under impact loading and provide references for further research and discussion.

show abstract

Section: Simulation Results and Discussionmentioning

confidence: 99%

Dynamic characteristics and crack evolution laws of coal and rock under split Hopkinson pressure bar impact loading

Sun

Jin

et al. 2023

Meas. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…The adhesion of repair materials to the underlying layer largely depends on the mechanical interlock with the prepared concrete surface. Sufficient force should be applied to the repair materials to establish complete contact with the prepared surface in order for this to occur [18,19]. Additionally, the repair materials should have sufficient flowability to penetrate into the voids of the underlying layer and interact with the prepared surface.…”

Section: Methods and Practical Tips For Repairing Concretementioning

confidence: 99%

Incorporating Bacteria for Self-Healing Properties in Innovative Concrete Technology

Khalatbari

2023

jcer

View full text Add to dashboard Cite

Nanotechnology is poised to offer a viable solution for achieving high performance in future construction projects. Among the innovative technologies being explored, smart concrete has garnered significant attention and undergone extensive research in reputable scientific centers worldwide in recent years. A notable advancement within this field is the development of self-healing concrete. Concrete structures are undeniably susceptible to cracking, primarily due to natural processes. These cracks serve as pathways for harmful substances to infiltrate and corrode the reinforcement bars, ultimately leading to the degradation of the concrete. Traditional approaches to address this issue involve the use of repair materials, particularly various polymers. However, these materials not only complicate the repair process but also have adverse environmental consequences. In light of these challenges, scientists have discovered an alternative method that involves incorporating bacteria into concrete production to create self-healing properties. This method not only reduces maintenance and repair costs but also minimizes environmental impact, thereby enhancing the durability and performance of the concrete while extending its service life. By harnessing the power of bacteria, self-healing concrete represents a significant breakthrough in sustainable construction practices.

show abstract

“…The shrinkage deformation of concrete Is one of the main characteristics of early-age concrete, and the low water-to-cement ratio, high compactness, high fluidity, and large amount of mineral admixtures exhibited by modern concrete may further increase the early deformation of concrete [7][8][9][10]. Due to the continuous improvements in the mechanical properties of concrete materials and structural design methods, cracks caused by direct loading rarely occur in concrete structures under normal usage [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Moisture Diffusion Coefficient of Concrete under Different Conditions

Zhou,

Li,

et al. 2023

Buildings

View full text Add to dashboard Cite

Humidity change in concrete is the leading cause of concrete shrinkage. Moreover, the moisture diffusion coefficient of concrete is an essential parameter for assessing and predicting the internal moisture content of concrete. However, there is a lack of theoretical construction and experimental studies on the effect of different conditions, especially different constraints, on the moisture diffusion coefficient of concrete. Therefore, the internal humidity, pore structure parameters, and basic mechanical properties of concrete under different strength grades C30, C40, C50, and C60 (C stands for concrete and numbers indicate the strength class of the concrete), curing environments (dry and sealed curing conditions), and constraints were tested in this study. In addition, a calculation model of concrete’s internal humidity and humidity diffusion coefficient was established. The research findings show that the internal humidity of concrete decreased with age due to hydration and drying. External humidity had a significant effect on the moisture change of concrete, and the lower the external humidity, the larger the humidity diffusion coefficient and the faster the internal humidity of concrete decreases. Reinforcement (confinement) changes the pore structure parameters of the concrete, which in turn affects the transport of moisture within the concrete. The higher the reinforcement rate, the larger the pore structure parameters of the concrete, the larger the humidity diffusion coefficient, and the faster the concrete humidity decreases. The method proposed in the study can accurately predict the internal humidity of concrete using the humidity diffusion coefficient. The research results are a reference for preventing concrete shrinkage and cracking in construction.

show abstract

A meshless method for modeling the microscopic drying shrinkage cracking processes of concrete and its applications

Cited by 9 publications

References 30 publications

Dynamic characteristics and crack evolution laws of coal and rock under split Hopkinson pressure bar impact loading

Dynamic characteristics and crack evolution laws of coal and rock under split Hopkinson pressure bar impact loading

Incorporating Bacteria for Self-Healing Properties in Innovative Concrete Technology

Moisture Diffusion Coefficient of Concrete under Different Conditions

Contact Info

Product

Resources

About