Article
Engineering, Geological
Elif Avsar
Summary: The study found that the block size distribution of Sille bimrock is scale-invariant and shows fractal fragmentation, with power-law distributions for block sizes and evident skewness in normal distribution. Additionally, an increase in volumetric block proportions led to an increase in internal friction angle, while cohesion decreased, and strain softening behavior was observed after attaining peak shear stress.
ENGINEERING GEOLOGY
(2021)
Article
Construction & Building Technology
Zhiduo Zhu, Wangwen Huo, He Sun, Borui Ma, Liu Yang
Summary: The objective of this research was to investigate the effects of different granulated blast furnace slag (GBFS) on the unconfined compressive strength, sorptivity, and pore structures of recycled concrete fine powder (RCFP) based geopolymers. Tests were conducted to measure the unconfined compressive strength, sorptivity coefficient, and analyze the pore structures using SEM and MIP methods. The results showed that the incorporation of GBFS effectively reduced the sorptivity coefficient and increased the unconfined compressive strength. SEM analysis revealed that GBFS improved the degree of reaction, leading to a refinement of the internal pore structure. The addition of GBFS also facilitated the conversion of macropores into micropores, reducing porosity and pore size.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Ketholyn J. Bespalhuk, Tiego J. C. de Oliveira, Joao V. P. Valverde, Rhudyeris A. Goncalves, Lucas Ferreira-Neto, Paula C. S. Souto, Josmary R. Silva, Nara C. de Souza
Summary: Cement is a commonly used construction material due to its cohesive properties, low cost, versatility, and moldability. The microstructure and properties of cementitious materials are affected by curing conditions and time. In this study, cylindrical specimens were fabricated to investigate the effect of curing conditions on the morphology and compressive strength of hardened pastes. The results showed that with increased curing time, the fractal dimensions of the hydrated cement increased, leading to an increase in compressive strength.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Physical
Wioleta Iskra-Kozak, Janusz Konkol
Summary: This article explores the effects of aluminum nanoxide on the physical, strength, and structural properties of cement mortars. It is found that the addition of 1% aluminum nanoxide leads to a significant increase in compressive strength and influences the fractal dimensions of the fracture surface profile lines.
Article
Mechanics
Guangzhi Li, Xinshuai Shi, Jianguo Ning, Weiqiang Chen, Zhaohui Zhang, Jun Wang, Shang Yang, Yuan Gao
Summary: This study investigates the dynamic behavior of Cement Waste Rock Backfill (CWRB) under impact loading. The results show that the response of CWRB with different particle size distributions to impact strain rate is inconsistent. Higher strain rates further deteriorate the dynamic compressive behavior of CWRB due to pore structure effect. This research enhances our understanding of CWRB behavior under dynamic loading and contributes to the safety and efficiency of mining operations.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Microbiology
Yongshuai Sun, Xinyan Zhong, Jianguo Lv, Guihe Wang
Summary: This study mainly focused on the effects of microbial induced calcium carbonate precipitation (MICP) technology and the combined effect of MICP technology and lignin on the improvement of silt in the Beijing area. The optimal values of cement concentration and lignin were determined by conducting unconfined compressive strength and dynamic triaxial test methods. The results showed that MICP technology combined with lignin could effectively improve the compressive strength of the silt sample.
Article
Construction & Building Technology
Guosheng Xiang, Danqing Song, Huajian Li, F. E. Jalal, Hao Wang, Yinkang Zhou
Summary: An aged steel slag was utilized as fine aggregate to prepare foam concrete in order to improve its resource utilization rate. The optimal mixture ratio was determined based on particle size, SSR, and water-binder ratio, with 20% SSR showing the most uniform pore distribution and compact structure. The relationship between compressive strength and porosity of the foam concrete has been established using fractal theory.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Xiao Han, Baomin Wang, Jingjing Feng
Summary: This study analyzed the pore structure characteristics of concrete with different strength grades using Mercury intrusion porosimetry and established a mathematical model between fractal dimension and compressive strength. The fractal dimension can accurately describe the pore characteristics and is correlated with pore diameter and specific surface area.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Mathematics, Interdisciplinary Applications
Lu Zhang, Hongyu Gong, Jianping Liu, Haizhou Li
Summary: This paper systematically studied the mechanical properties and durability of concrete prepared with copper slag as a replacement for natural aggregates. The results showed that replacing natural sand with copper slag improved the compressive strength and corrosion resistance of the concrete. Optimum replacement rate, water-cement ratio, and dosage of water-reducing agent were determined. The tests and analysis provided insights into the improvement mechanisms of copper slag on concrete's mechanics and durability.
FRACTAL AND FRACTIONAL
(2022)
Article
Construction & Building Technology
Bangbiao Wu, Shousong Zhang, Yu Zhao, Tongge Cui, Ying Xu
Summary: This study investigates the dynamic compressive properties of straw-fiber reinforced rubberized mortar (SFRM). The findings reveal that increasing the fiber ratio improves the dynamic energy absorption capacity of SFRM, enhancing its resistance to shock and blast loads.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Xiao Han, Jingjing Feng, Baomin Wang
Summary: The microscopic pore structure and compressive strength of fly ash-cement composite cementitious materials were measured at 20 degrees C and 60 degrees C using mercury intrusion porosimetry and compressive strength test. The fractal dimensions of each specimen were calculated and the relationship between fractal dimension and pore structure parameters were analyzed. A mathematical model was established to characterize the relationship between pore structure and compressive strength. The research results showed that the fractal dimension can directly reflect the relationship between compressive strength and pore structure.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Mathematics, Interdisciplinary Applications
Jielin Li, Shuaijie Tan, Chun Yang, Hui Chen, Yun Lin
Summary: In this study, XRD component measurement, P-wave velocity, freeze-thaw cycling test at different times, uniaxial compression test, and scanning electron microscope (SEM) test were conducted to investigate the mechanical properties and microstructure evolution of skarn under freeze-thaw cycles. The results showed that the mass of the rock increased and the P-wave velocity, compressive strength, elastic modulus, and Poisson's ratio all decreased with an increase in the number of freeze-thaw cycles. The SEM images revealed the development and expansion of fine pores and fissures in the rock, leading to a decrease in inter-particle bonding force and loosening of the cement. The relationship between compressive strength and fractal dimension was established to further understand the mechanism of skarn damage under freeze-thaw action, providing a theoretical basis for characterizing freeze-thaw damage of rocks in cold regions.
FRACTAL AND FRACTIONAL
(2023)
Article
Multidisciplinary Sciences
Bruno da Silva Falcao, Ausama Giwelli, Melissa Nogueira Kiewiet, Stephen Banks, George Yabesh, Lionel Esteban, Leigh Kiewiet, Nurudeen Yekeen, Yevhen Kovalyshen, Ludwig Monmusson, Ahmed Al-Yaseri, Alireza Keshavarz, Stefan Iglauer
Summary: Conventional rock mechanics testing may not accurately measure rock strain if the tested rock has significant heterogeneity. Fibre Bragg Grating (FBG) sensors have been introduced as a versatile alternative for strain measurement during rock mechanics testing. This study aims to explore the capabilities of FBG sensors for strain measurement during rock mechanics testing, including under confining conditions.
Article
Construction & Building Technology
Mhammed Abdeldjalil, Kaddour Chouicha
Summary: The main objective of this work is to highlight the contribution of the cement-to-water ratio and fractal dimension model to the prediction of concrete compressive strength. The fractal dimension concept provides insights into the fineness and compactness of granular mixtures, while the unconventional fractal granular model effectively correlates the cement-to-water ratio with the compressive strength of concrete. The study involves investigating 99 granular mixtures from literature and analyzing 36 concrete mixtures with different granular compositions. The analytical model shows a strong correlation with experimental values of compressive strength, indicating the importance of including the fractal granular model and cement-to-water ratio when predicting concrete compressive strength. This theoretical approach, validated through real case studies, can guide the selection of key factors for predicting concrete compressive strength.
INTERNATIONAL JOURNAL OF CONCRETE STRUCTURES AND MATERIALS
(2022)
Article
Construction & Building Technology
Weitan Zhuang, Shaohua Li, Qingliang Yu
Summary: Supplementary cementitious materials (SCMs) can replace cement in UHPC, leading to reduced CO2 emissions and construction costs. This study comprehensively investigates the influence of different SCMs on the workability, pore structure, quasi-static compressive strength, and dynamic compressive properties of UHPC paste. The results show that using ground granulated blast furnace slag (GGBS) and limestone powder (LP) increases workability but also leads to increased porosity and decreased compressive properties at higher replacement rates.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
