Article
Construction & Building Technology
Alireza Pourhassan, Ahmed A. Gheni, Mohamed A. ElGawady
Summary: This study used a small-wheel traffic simulation device (SWTS) to replicate the stresses of rolling vehicle tires and generate comparable raveling results. The results showed that each wheel application by SWTS is equivalent to 2.5 to 3 passenger car passes in the field. It was also found that using crumb rubber instead of mineral aggregate significantly reduced tire wear and microplastic emissions from vehicle tires. Additionally, the Pennsylvania and Vialit tests may not be suitable for assessing aggregate retention under traffic load.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Mohammad Javad Azarhoosh, Mehdi Koohmishi
Summary: The study investigates the use of random forest (RF) algorithm in predicting the hydraulic conductivity of coarse-sized granular material. Artificial neural network (ANN) and adaptive network-based fuzzy inference system (ANFIS) are also considered for comparison. Based on the characteristics of particle size distribution and air void content, the hydraulic conductivity coefficient is predicted. The results show that air void content is the most influential factor affecting the permeability of granular media made of coarse-sized aggregate.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Xu Zhao, Dongyu Niu, Peng Zhang, Yanhui Niu, Huiyun Xia, Pengfei Liu
Summary: The difference between laboratory compaction and field compaction significantly affects the characteristics of asphalt concrete (AC). This research compared the effects of laboratory and field compaction on AC using various characteristic indexes. The results showed that SGC and SBC compaction methods produced AC specimens with better mechanical properties similar to field compaction. The study highlighted the importance of compaction methods and equipment selection in accurately evaluating the performance of AC.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Yanlong Li, Jihan Liu, Yunhe Liu, Heng Zhou, Lifeng Wen, Junhao Chen
Summary: The aim of this study was to enhance the performance of hydraulic asphalt concrete by reducing the amount of required asphalt. Aggregate gradation design was investigated for this purpose. The optimal skeleton gradation for coarse aggregates was determined by step-by-step filling vibration compaction, while a mathematical model based on gradation fractal theory and the Dinger-Funk equation was obtained for fine aggregates. The new gradation design showed improved characteristics compared to the control group, providing a new approach for designing hydraulic asphalt concrete with enhanced performance.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Industrial
Claudine Melan, Nadine Cascino
Summary: The company introduced a 'compressed' shift schedule to better fit with aircraft traffic load and then conducted a survey to assess its effects, with results showing the marginal impact of work organization on ATCOs. Traffic load affected sleep satisfaction and alertness.
APPLIED ERGONOMICS
(2022)
Article
Construction & Building Technology
Hui Guo, Xiongwei Dai, Kexin Zhang, Yuanyuan Pan, Jinting Wu
Summary: This paper studied the initial accumulation state of coarse aggregates in asphalt mixtures, explored the theoretical compaction space and stability of different grades, and highlighted the importance of compaction in grade design.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Xingwang Wang, Hainian Wang, Ponan Feng, Chonghui Wang, Chen Zhang, Amir Golroo
Summary: This paper studies the discrete features of asphalt mixture compaction and analyzes the movement of coarse aggregates. X-ray CT images are used to track the position of aggregates, and a method to quantify aggregate movement property is proposed. The results suggest that the angularity and interlocking frame of aggregates significantly affect the compaction process and pavement structure stability. Differences in aggregate movement for different mixtures and gradations are also observed.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Materials Science, Composites
Yunfang Long, Yi Zhang, Xiangyi Hu, Qinhe Zhang, Jianhua Zhang
Summary: This study designed two aggregate gradation schemes (fractal aggregate gradation and coarse aggregate broken gradation) and investigated the effects of resin dosage, vibration time, and defoaming agent dosage on the mechanical properties, porosity, and coefficient of thermal expansion (CTE) of RMC. The experimental results showed that the coarse aggregate broken gradation (CABG) performed better in terms of mechanical properties, porosity, and thermal expansion properties.
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
(2023)
Article
Construction & Building Technology
Yidong Chen, Yunsheng Zhang, Yu Zhang, Bo Pang, Wenhua Zhang, Cheng Liu, Zhiyong Liu, Dafu Wang, Guowen Sun
Summary: This study experimentally investigates the impact of coarse aggregate gradation on the properties of 3D printed concrete and proposes an evaluation coefficient to characterize the average particle size of coarse aggregates with different gradations. The results show that concrete with continuous grading performs better in terms of flowability and structure stacking, and an increase in the proportion of large-sized coarse aggregates reduces drying shrinkage.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Pawel Polaczyk, Bingye Han, Hongren Gong, Yuetan Ma, Rui Xiao, Wei Hu, Baoshan Huang
Summary: The gradation of aggregate is crucial for the performance of asphalt mixtures. The study found that the locking point of asphalt mixtures is strongly dependent on their gradation, with coarser mixes resulting in higher locking points.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
Ming Yang, Jiangang Ding, Wei Li, Aojia Tian, Lili Pei, Xueli Hao
Summary: This paper proposes an automated gradation detection method based on 3D point clouds and deep learning. It builds a line structured light-based acquisition system to collect aggregate point cloud data and applies a multi-threshold segmentation method for aggregate segmentation. The proposed ISRNet model and GA-LightGBM model achieved high accuracy in aggregate particle size classification and quality prediction.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Vinh Thi Hai Chu, Vinh Duc Bui, Tue Viet Nguyen
Summary: Ultra-High Performance Concrete (UHPC) was studied in terms of its constituent materials, including aggregate and cementitious materials. The combination of quartz sand and crushed stone as aggregate and a proper ratio of silica powder and blast furnace slag in the cement paste resulted in ultra-high performance. The compressive strength of UHPC reached 135.74 MPa at 7 days, corresponding to 90% of its 28 days' strength (150.98 MPa). The study provides an economically efficient mixture-proportioning for UHPC and demonstrates the use of slag to enhance concrete performance and reduce environmental impact.
Article
Materials Science, Multidisciplinary
Rui Zhang, Kailang Li, Fan Yu, Hua Zhang, Zhang Gao, Yubin Huang
Summary: This paper aims to establish an efficient and accurate aggregate particle identification and aggregate gradation analysis method based on the network of mask R-CNN. The proposed method effectively identifies aggregate particles and accurately analyzes aggregate gradation. The results show that the method achieves close agreement with ground truth and improves identification accuracy through transfer learning.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Construction & Building Technology
Huiqin Zhang, Zhenghao Ma, Ping Ji, Yufeng Bi, Weidong Cao, Shutang Liu
Summary: In this paper, a prediction method for ranking the voids in mineral aggregate (VMA) value without testing is established. The method includes setting up theoretical-empirical models for different gradations and determining the VMA value of each gradation. The experimental results show that the predicted VMA values are consistent with the measured values, demonstrating the effectiveness of the prediction method.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Construction & Building Technology
Yuanxun Zheng, Yu Zhang, Jingbo Zhuo, Peng Zhang, Shaowei Hu
Summary: In this paper, a 2D finite element model with a mesoscale level was established to study the effects of aggregate content, maximum particle size, and shape on the strength of concrete. Five mesoscopic models were used to investigate the influence of aggregate grading and model size on compressive strength. The simulation results were compared with theoretical models, showing good agreement and providing valuable insights into the behavior of concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
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)