Article
Construction & Building Technology
Lei Wang, Qiancheng Zhang, Jin Yi, Jiwang Zhang
Summary: This paper focuses on the ultrasonic pulse velocity (UPV) characteristics of coral concrete, especially with respect to porosity and compressive strength. The study found that the diverse morphology and complex internal structure of the coral aggregate greatly affect the homogeneity of its UPV. The study also discovered a strong correlation between the porosity, compressive strength, and UPV of the coral concrete, allowing for the inference of strength through the UPV method.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Zicong Yu, Zaixian Chen, Pang Chen, Xinghao Liu, Yongfu Wu, Chao Wang
Summary: This study proposes a meso-scale simulation methodology to determine the influencing factors of UCS and UPV. A meso-scale finite element model of concrete is developed, and using L18 orthogonal array, the effects of significant influencing factors are analyzed. The analysis of variance (ANOVA) results show that water-cement ratio is the only significant influence factor for UCS, while significant factors for UPV include water-cement ratio, aggregate type and ITZ porosity. The rationality of the simulation methodology is validated with low relative errors achieved on the experimental data and theoretical formulations (4.72% for UCS and 3.21% for UPV).
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Physical
Youngjin Nam, Keesin Jeong, Wonchang Kim, Hyeonggil Choi, Taegyu Lee
Summary: This study evaluated the initial mechanical properties of concrete with partial cement replacement using non-sintered hwangto (NHT). The experimental results showed that the compressive strength of the concrete decreased with an increase in NHT content. However, under certain conditions, substituting cement with NHT could increase the ultrasonic pulse velocity (UPV) of the concrete.
Article
Chemistry, Physical
Bogdan Bolborea, Cornelia Baera, Sorin Dan, Aurelian Gruin, Dumitru-Doru Burduhos-Nergis, Vasilica Vasile
Summary: The study focuses on predicting concrete compressive strength using ultrasonic testing, achieving accurate results with high precision. Non-destructive determination of dynamic and static modulus of elasticity plays a key role in this method, leading to successful estimation of concrete strength.
Article
Chemistry, Physical
Wonchang Kim, Hyeonggil Choi, Taegyu Lee
Summary: This study analyzed the mechanical properties of normal aggregate concrete (NC) and lightweight aggregate concrete (LC) subjected to high temperatures. The mass loss, compressive strength, ultrasonic pulse velocity (UPV), and elastic modulus were measured. LC showed higher mass reduction rate and better residual mechanical properties than NC after exposure to high temperatures. The correlation between compressive strength and UPV for concrete subjected to high temperatures differed significantly from the prediction equation at room temperature, and the prediction equation considering W/C had reduced error range.
Article
Chemistry, Physical
Ominda Nanayakkara, Hadee Mohammed Najm, Mohanad Muayad Sabri Sabri
Summary: Non-destructive tests are a solution to evaluate material strength, but their results can be affected by various factors. This study investigates the influence of single reinforcement steel bar on ultrasonic pulse velocity through experimental investigation, and provides a reliable solution through statistical analysis.
Article
Construction & Building Technology
Ashish Kumer Saha, Subhra Majhi, Prabir Kumar Sarker, Abhijit Mukherjee, Ayesha Siddika, Farhad Aslani, Yan Zhuge
Summary: The aim of this research was to develop an equation to predict the compressive strength of concrete in terms of ultrasonic pulse velocity (UPV) and concrete mix design parameters. The equation was validated through statistical analysis and compared with experimental data from various published literature, demonstrating an overall coefficient of determination (R-2) of 0.88.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Chemistry, Physical
Wonchang Kim, Hyeonggil Choi, Taegyu Lee
Summary: Research on alternative cement materials and the evaluation of their high-temperature properties is important for fire safety. This study evaluated the mechanical properties of concrete with non-sintered hwangto (NSH) as a partial replacement for cement at high temperatures. The results showed that mass loss decreased as NSH content increased. The residual compressive strength and ultrasonic pulse velocity (UPV) were influenced by NSH replacement and water-to-binder ratio (W/B). The linear prediction model proposed for compressive strength showed a slightly higher value for W/B 41 compared to W/B 33.
Article
Chemistry, Physical
Ma. Doreen Esplana Candelaria, Seong-Hoon Kee, Kang-Seok Lee
Summary: The aim of this research is to recommend a set of criteria for estimating the compressive strength of concrete under marine environment with various saturation and salinity conditions. Machine learning methods are used to establish multivariate prediction models based on different parameters. Based on the analysis, a prediction model using two NDE parameters and one design parameter is recommended for assessing compressive strength under marine environment.
Article
Chemistry, Multidisciplinary
Yung-Chiang Lin, Yiching Lin, Chia-Chi Cheng
Summary: This paper aims to develop a unified equation for predicting concrete strength using ultrasonic pulse velocity. The experimental results showed a strong correlation between the UPV evolution index and the strength evolution index, and a unified equation was established. The applicability of the equation was verified by different studies, demonstrating its value in decision-making processes.
APPLIED SCIENCES-BASEL
(2022)
Article
Geochemistry & Geophysics
Xichun Tian, Wenbin Xu
Summary: This paper investigates the prediction of the mechanical performance of cemented tailings backfill (CTB) using the ultrasonic pulse velocity (UPV) method. CTB samples with different binder-to-water ratios and solid content were monitored by UPV during the curing process. The results show a positive correlation between UPV and curing age, binder-to-water ratio, and solid content. Empirical equations for predicting the uniaxial compressive strength (UCS) of CTB using UPV were developed and validated. The main finding is that the UPV monitoring method is effective for predicting the mechanical properties of CTB and is non-destructive and efficient.
Article
Materials Science, Multidisciplinary
Abhijit Warudkar, S. Elavenil
Summary: This study evaluated the relationship between abrasion, compressive strength, and quality grading of concrete, finding that abrasion resistance increases with higher compressive strength and ultrasonic pulse velocity. The research concluded that concrete with better quality grading, sound microstructure, and higher compressive strength, along with the use of superplasticiser, leads to better abrasion resistance.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Engineering, Chemical
Qiang Wang, Daqing Chen, Kai Zhu, Zitai Zhai, Juntao Xu, Linlin Wu, Dong Hu, Weirong Xu, Huandong Huang
Summary: This study combines ultrasonic pulse velocity (UPV) and ultrasonic shear-wave tomography to measure the residual compressive strength (RCS) and detect inner defects in lining concrete blocks. The research investigates the changes in RCS of test blocks after exposure to elevated temperatures and constant heating times. SEM is used for micro-phase analysis and a simulated post-fire damage sample is designed. Shear-wave tomography is effective in detecting void defects at a certain depth.
Article
Multidisciplinary Sciences
Guoqiang Du, Liangtao Bu, Qi Hou, Jing Zhou, Beixin Lu
Summary: By using a GA-optimized BPNN model, a model that accurately predicts the compressive strength of SCC was successfully established, showing excellent agreement between predicted values and test values, reducing the cost and time for SCC compressive strength testing.
Article
Chemistry, Physical
Mahmood Karimaei, Farshad Dabbaghi, Mehdi Dehestani, Maria Rashidi
Summary: The overuse of coal resources has caused environmental issues, leading to the use of coal waste in concrete as an alternative. Through non-destructive testing, the study found that replacing natural aggregates with untreated coal waste can improve the strength and velocity of concrete, but excessive replacement can weaken these parameters.
Article
Chemistry, Multidisciplinary
Jaehyun Lee, Taegyu Lee
APPLIED SCIENCES-BASEL
(2020)
Article
Chemistry, Multidisciplinary
Taegyu Lee, Jaehyun Lee
APPLIED SCIENCES-BASEL
(2020)
Article
Construction & Building Technology
Jaehyun Lee, Taegyu Lee, Jaewook Jeong, Jaemin Jeong
Summary: This study analyzed the sustainability and engineering properties of low-carbon materials using alkali-activated slag and high CaO fly ash, and derived their expected effects on the optimal binder weight range. The research found that increasing binder weight decreases gel time but tends to increase homogel strength, and also affects the global warming potential.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Green & Sustainable Science & Technology
Jaehyun Lee, Taegyu Lee, Jaewook Jeong, Jaemin Jeong
Summary: This study investigated the compressive strength properties of binary blended low-carbon concrete and examined the impact of replacement ratios of ground granulated blast-furnace slag (GGBS) and fly ash (FA) on concrete strength. The results indicated that there is potential for commercialization of this type of concrete with appropriate mixing proportions.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Chemistry, Physical
Taegyu Lee, Jaehyun Lee, Jaewook Jeong, Jaemin Jeong
Summary: This study found that the combined use of EPC and GGBS greatly improves the early-strength development and chloride resistance of concrete, reducing form removal time and increasing construction productivity. Additionally, EPC and GGBS were more effective than C35 concrete in terms of economic and environmental impacts.
Article
Environmental Sciences
Jaehyun Lee, Jaewook Jeong, Jayho Soh, Jaemin Jeong
Summary: The construction industry has the highest number of fatalities among all industries, making it important to estimate total loss and develop a framework considering various aspects of labor, industry, and regulations. Through a case study, the total fatality loss was estimated to be $2,198,260 per person, contributing to the development of a comprehensive framework for reliable data acquisition and analysis.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2021)
Article
Environmental Sciences
Minsu Lee, Jaemin Jeong, Jaewook Jeong, Jaehyun Lee
Summary: This study analyzes injury and fatal accidents in the construction industry based on the physiological equivalent temperature (PET) related to thermal comfort, and identifies 'falls' as the most frequent fatal incident and injury type, with the majority occurring in the autumn season. The research findings contribute to providing data for a safety management database considering weather conditions.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2021)
Article
Environmental Sciences
Yukyung Shim, Jaemin Jeong, Jaewook Jeong, Jaehyun Lee, Yongwoo Kim
Summary: This paper compares the fatality rates of the construction industry in different countries using conventional and pair methods. The research findings indicate that the risk level may vary among countries depending on the evaluation conditions.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2022)
Article
Construction & Building Technology
Jaemin Jeong, Jaewook Jeong, Minsu Lee, Jaehyun Lee, Soowon Chang
Summary: This study develops a user-friendly data-driven prediction model to evaluate outdoor thermal comfort for managing people's health and productivity. The results show that an optimized machine learning algorithm achieves high prediction accuracy, and the model can be easily used by non-experts.
BUILDING AND ENVIRONMENT
(2022)
Article
Green & Sustainable Science & Technology
Saemi Bang, Jaewook Jeong, Jaehyun Lee, Jaemin Jeong, Jayho Soh
Summary: Compared with other industries, the construction industry has a higher risk of fatalities. In Korea, the risk level in the construction industry is measured using the fatality rate per 10,000 construction workers. However, this statistic is not accurate as it does not consider the exact number of workers and fails to reflect the specific characteristics of the construction industry. This study proposes a method to determine the quantitative risk level by considering facility type and project size based on total cost.
Article
Construction & Building Technology
Jiwon Hwang, Jaewook Jeong, Minsu Lee, Jaemin Jeong, Jaehyun Lee
Summary: This study examines the relationship between construction accidents and outdoor thermal comfort index based on accident data from all seasons and regions. The study finds that the probability of accidents increases with higher or lower PET temperatures.
SUSTAINABLE CITIES AND SOCIETY
(2023)
Article
Construction & Building Technology
Jayho Soh, Jaewook Jeong, Jaemin Jeong, Jaehyun Lee
Summary: The construction industry has the highest frequency of injuries and fatal accidents. This study proposes a quantitative risk assessment method for accurately evaluating the risk levels of building facilities and classifies them into similar risk groups. The results show that residential buildings have the highest risk ranking in terms of accident probability and financial losses. This study's risk assessment method can contribute to reducing accidents by identifying the exact risk levels of different facility types.
Article
Construction & Building Technology
Jaehyun Lee, Jaewook Jeong, Jayho Soh, Jaemin Jeong
Summary: This study comprehensively evaluates accident prevention costs (APCs) in the Korean construction industry, considering the specific characteristics of Korean construction projects. The study analyzes the current status and differences in APCs based on case studies and develops a quantification model that incorporates safety-related laws and insurance systems in Korea.
Article
Construction & Building Technology
Louis Kumi, Jaewook Jeong, Jaemin Jeong, Jaehyun Lee
Summary: In this study, the amount of dust construction workers are exposed to is estimated by considering different factors of dust emission, and the health and economic impact of dust emissions are assessed. The results show that earthwork during construction activities has the highest dust concentration.
Article
Construction & Building Technology
Qi Jiang, Wei Liu, Shaopeng Wu, Xuanwen Gou
Summary: This study analyzes the erosion mechanisms of NaCl solution on asphalt concrete and finds that NaCl solution softens asphalt and promotes the intrusion of crystalline salt into it. Salt crystallization alters the surface roughness of aggregates, resulting in a decrease in skid resistance but an improvement in compressive strength. Additionally, the concentration of NaCl solution initially has no significant impact on the mechanical performance of asphalt concrete, but its domination gradually increases with the intensification of cyclic effects.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Lili Kan, Lan-qing Dai, Ning Kong, Bin Peng, Fei Wang
Summary: This paper investigates the effect of freezing and thawing cycles on the tensile behavior of cracked ultra-high performance concrete (UHPC). The results show that long-term freezing and thawing action deteriorates the cracking strength, tensile strength, tensile strain, and strain energy of cracked UHPC. On the other hand, the action of water generally favors the development of tensile properties of UHPC. The crack distribution tends to be unsaturated under freezing and thawing environment, and the re-hydration reaction is hindered. The pore structure near the crack varies under different environments.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Xin Xiao, Jingwei Li, Qingke Meng, Xiangshan Hou, Yanhui Liu, Xujiang Wang, Wenlong Wang, Shengtao Lu, Yuzhong Li, Yanpeng Mao, Tong Li
Summary: Preparing gypsum-based self-leveling mortar (GSLM) using beta-hemihydrate gypsum and solid wastes-derived sulfoaluminate cement (WSAC) can improve the mechanical performance of the mortar, but phosphorus impurities can weaken the hydration speed and degree.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Sihang Bao, Junzhen Di, Yanrong Dong, Ziqing Gao, Qing Gu, Yuanfang Zhao, Hongyu Zhai
Summary: Tailings dam break and leakage accidents pose a threat to the safety of people in mining areas and cause severe environmental pollution. This study focuses on solidifying tailing sand using microbial induced calcite precipitation (MICP) to improve strength and fix heavy metals. The curing time of MICP bio-cemented tailings is found to significantly impact the strength of tailings, while its effect on heavy metal fixation is minimal. The optimized MICP curing time is 10 days, resulting in improved strength and cementation of tailings particles.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Ferhat Benmahiddine, Fares Bennai, Achraf Charaka, Ameur El Amine Hamami, Abdelkader Tahakourt, Rafik Belarbi
Summary: This paper studied the effects of hysteresis on the hygrothermal behavior at the building scale. Through laboratory validation and numerical simulations, it was found that hysteresis has a significant impact on the relative humidity and total heat fluxes in buildings, while it does not have a noticeable effect on temperature variations.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
You Gao, Wei He, Xiayang Zhang, De'an Sun, Pei Li
Summary: This study determined the boundary line between the swelling and compression deformation zone in lateritic clay through wetting tests, and proposed a simple bimodal SWRC model. It also found that the existing strength model underestimated the tested values in the medium to high suction range, therefore a segmented strength equation was introduced for enhanced predictions of the strength properties of lateritic clay.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Prabhath Ranjan Kumar Soda, Asheer Mogal, Kalyan Chakravarthy, Nikhil Thota, Nimish Bandaru, Sanjay Kumar Shukla, K. M. Mini
Summary: This study investigates the use of encapsulated bacteria to improve the self-healing ability of concrete. Through various tests, it is found that using 20% cement-coated alginate beads (CCAB) and 5% nanosilica (NS) can achieve optimal strength and healing. This research is significant for enhancing the durability of concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Shizhe Wang, Haiping Wu, Wen Yang, Wei Wang, Zhibo Zhu, Kun Nie, Luoxin Wang, Hua Wang, Jing Wu
Summary: In this study, photothermal-heat storage concrete (PHSC) was developed with excellent photothermal conversion performance and heat storage capacity. By absorbing and storing solar energy during the day and releasing it at night, PHSC can effectively reduce energy consumption in buildings.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Robin Deb, Jialuo He, Geetika Mishra, Yaghoob (Amir) Farnam
Summary: Incorporation techniques of phase change materials in cementitious composites have a significant influence on thermal properties. This study investigated the thermal behavior of low-temperature PCM when subjected to varying temperature change rates and pore confinement inside the porous network of lightweight aggregates. The results showed that ramp rates affect the nucleation and crystallization growth process during the phase transition, and the pore structure of the aggregates affects the supercooling phenomenon and confinement pressure of the PCM.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Eduardo Ferreira, Payam Sotoudeh, Dagmar Svecova
Summary: This study investigates the fatigue behavior of concrete under different stress reversal conditions. The results indicate that stress reversal generally causes more severe damage and reduces the cycles to failure compared to tensile fatigue. Additionally, adding some level of compression contributes to the energy required for failure under stress reversal fatigue. Specimens with higher concentration of fractured aggregates achieve longer fatigue lives.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Mag Raj Gehlot, Sandeep Shrivastava
Summary: This study evaluates the compatibility relationship between plaster bonds and the substrate under an accelerated aging environment, and finds that incorporating an appropriate amount of granite cutting waste can improve the strength parameters and adhesion of the cement mortar.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Min Zhang, Qirui Luo, Mingke Deng, Shixing Zhao
Summary: This study investigated the bond behavior between carbon FRCM composites with added short fibers and concrete substrates. The effects of different factors were considered and 36 specimens were tested and discussed. The experimental results were analyzed in terms of failure mode, load-slip curve, and characteristic parameters, and the contribution of weft yarns was taken into account in the developed bondslip model.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Dengkai Liu, Hongniao Chen, Ray Kai Leung Su
Summary: The susceptibility of building stones to fire and high temperature was investigated in this study by examining their physical and mechanical properties. The results show that both compressive and tensile properties of stones are affected by temperature changes. The tensile strength is particularly sensitive to temperature changes, requiring special attention to the components subjected to tensile stress in stone buildings. Principal component analysis was used to predict the mechanical properties of stones, providing a new method for calculating the residual mechanical properties after high temperature or fire.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Joso Maria Raposo, Eduardo Cavaco, Luis Costa Neves, Eduardo Julio
Summary: This paper investigates the correlation between the friction coefficient and the surface roughness of concrete-to-concrete interfaces. Experimental tests were performed on specimens with different surface treatments, and the surface roughness parameters were analyzed and correlated with the shear strength and friction coefficient. The results showed that certain roughness parameters had a strong positive correlation with the friction coefficient, while others had little or no correlation. A novel combined roughness parameter with optimized correlation was proposed.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Chiara Riccardi, Massimo Losa
Summary: The interest in using bio materials in asphalt pavements is growing due to economic reasons and environmental benefits. This study aimed to review the use of bio extenders as additives in binders, with a focus on replacements greater than 20% of fossil binder. The properties of bio-extended binders were found to vary substantially depending on the biomass source and production process.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
