Review
Construction & Building Technology
Mayank Mishra, Paulo B. Lourenco, G. V. Ramana
Summary: Structural health monitoring and damage assessment are complex tasks, but wireless IoT technology offers new solutions. By utilizing real-time sensor data and cloud-based storage systems, comprehensive assessments of structural health can be conducted, with applications in various fields.
JOURNAL OF BUILDING ENGINEERING
(2022)
Review
Construction & Building Technology
Jeonghyun Kim
Summary: This study reviews the literature on the effect of recycled aggregate quality on the mechanical properties of concrete and includes discussions on the characteristics of recycled aggregate and factors influencing its quality. Data on the fresh and hardened properties of recycled aggregate concrete mixed with different qualities are reviewed, providing insights into the effective utilization of recycled aggregate.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Dan Ma, Hongyu Duan, Jixiong Zhang
Summary: This paper investigates the hydraulic properties of fault rock through one-dimensional radial seepage experiments. The results show that the permeability and porosity increase with time, and the occurrence process of water inflow can be divided into four stages. It is also found that the decrease of grain size distribution and the increase of water pressure lead to significant changes in hydraulic properties. The Carman-Kozoeny model demonstrates the highest accuracy among the tested prediction models, and it predicts a higher final permeability closer to the water outlet.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Review
Construction & Building Technology
Ruijun Wang, Zhiyao Hu, Yang Li, Kai Wang, Hao Zhang
Summary: This overview explains the freeze-thaw durability mechanisms of concrete and proposes measures for enhancement. Concrete additives can effectively improve freeze-thaw durability by improving pore systems, reducing water absorption, and controlling crack resistance. Furthermore, the concept of designing a durable concrete cover system is introduced.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Linchuan Yang, Yuan Liang, Baojie He, Yi Lu, Zhonghua Gou
Summary: Based on an analysis of property transaction data in Chengdu, this study finds that the implicit price of metro accessibility decreases during COVID-19, indicating a decline in the role of the metro and a smaller price gap between proximate and distant properties. However, COVID-19 does not have a negative impact on property prices in Chengdu, and the decrease in metro access premiums may be temporary.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Article
Construction & Building Technology
Abdullah M. Zeyad, Hassan M. Magbool, Bassam A. Tayeh, Afonso Rangel Garcez de Azevedo, Ahmed Abutaleb, Qudeer Hussain
Summary: Research has shown that using volcanic pumice dust (VPD) with cement kiln dust (CKD) or Ordinary Portland cement (OPC) to produce alkaline activated green concrete (HAC) can improve mechanical performance, strength, and engineering properties. Partial replacements of CKD or OPC can increase compressive strength and reduce water absorption rate.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Construction & Building Technology
Hemn Unis Ahmed, Ahmed S. Mohammed, Rabar H. Faraj, Shaker M. A. Qaidi, Azad A. Mohammed
Summary: This paper provides a detailed review on the effect of adding nano-silica (nS) on the compressive strength (CS) of geopolymer concrete (GPC). Various models, including artificial neural network (ANN), M5Ptree, linear regression, nonlinear regression, and multi logistic regression models, were developed to forecast the CS of GPC incorporated nS. Experimental results showed that the addition of nS improves the CS of GPC, and the ANN model performed the best in predicting the CS. Additionally, the alkaline solution to binder ratio, molarity, NaOH content, curing temperature, and ages were identified as significant parameters influencing the CS of GPC incorporated nS.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Construction & Building Technology
Mehran Khan, Mingli Cao, Chaopeng Xie, Majid Ali
Summary: This study examines the uniaxial compressive behavior of multi scale hybrid fiber reinforced concrete and investigates the influence of basalt fiber length and content on the properties of steel fiber-calcium carbonate whisker reinforced fly ash concrete. The results show that the multi scale hybrid fiber reinforced concrete exhibits superior compressive characteristics compared to plain concrete.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Construction & Building Technology
Yuxiang Tang, Jianzhuang Xiao, Hanghua Zhang, Zhenhua Duan, Bing Xia
Summary: This study proposes a fully recycled aggregate concrete (FRAC) prepared by replacing natural aggregates and partially replacing cement with recycled materials. The addition of recycled materials has a negative effect on concrete strength and shows little effect on the ascending branch of stress-strain curves but influences the descending branch. The elastic modulus decreases due to the incorporation of recycled aggregates and recycled powder.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Panagiotis G. Asteris, Paulo B. Lourenco, Panayiotis C. Roussis, Chryssi Elpida Adami, Danial J. Armaghani, Liborio Cavaleri, Constantin E. Chalioris, Mohsen Hajihassani, Minas E. Lemonis, Ahmed S. Mohammed, Kypros Pilakoutas
Summary: A model for estimating the compressive strength of concretes incorporating metakaolin was developed and evaluated using soft computing techniques. The model took into account six parameters as input data and was able to accurately estimate the compressive strength, considering the usage of metakaolin. The study highlighted the nonlinear influence of mix components on the resulting concrete compressive strength.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Computer Science, Interdisciplinary Applications
Zhong Zhou, Junjie Zhang, Chenjie Gong
Summary: This research proposes a deep learning-based model, YOLOv4-ED, to solve the challenges in traditional tunnel lining defect detection methods. By using EfficientNet as the backbone and introducing DSC, YOLOv4-ED achieves higher detection accuracy and efficiency. A tunnel lining defect detection platform (TLDDP) is built based on the robust and cost-effective YOLOv4-ED, enabling automated detection of various lining defects.
COMPUTER-AIDED CIVIL AND INFRASTRUCTURE ENGINEERING
(2022)
Article
Construction & Building Technology
Kai Cui, Kaikang Liang, Jun Chang, Denvid Lau
Summary: This study developed a new low-carbon ultra-high-performance concrete using sulphoa-luminate cement, with the addition of steel fiber enhancing its performance and durability. The research also identified a multi-level and multiscale reinforced mechanism and a self-healing effect similar to regular concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Junqing Zhu, Jingtao Zhong, Tao Ma, Xiaoming Huang, Weiguang Zhang, Yang Zhou
Summary: This study proposes using UAVs equipped with high-resolution cameras to collect pavement images for distress detection, trained three object-detection algorithms, and found that YOLOv3 performed the best. The findings of this research assist in inspecting non-destructive automatic pavement conditions.
AUTOMATION IN CONSTRUCTION
(2022)
Article
Construction & Building Technology
Mingzhi Wang, Xu Yang, Wei Wang
Summary: This study proposes a computational sequence to extract individual 3D concrete aggregates from computed tomography scans, establishing a database of 1442 aggregates with detailed information. Comparisons with existing reconstruction methods demonstrate that characterizing concrete composite with detailed information of each constituent can provide a more realistic representation of the composite. The vision of digital concrete with realistic aggregates input is further demonstrated through an example application.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Ling-Yu Xu, Bo-Tao Huang, Victor C. Li, Jian-Guo Dai
Summary: The geopolymer fine aggregates enhance the tensile ductility and crack width of high-strength ECC, reacting and bonding strongly with the cementitious matrix to create saturated multiple cracking and excellent tensile ductility. This study opens up a new avenue for the development of high-performance fiber-reinforced cementitious composites based on artificial geopolymer aggregates.
CEMENT & CONCRETE COMPOSITES
(2022)
Review
Construction & Building Technology
Fernanda de Andrade Salgado, Flavio de Andrade Silva
Summary: The construction sector plays a vital role in economies and has a significant impact on the environment. The use of recycled aggregate has a dual environmental advantage in reducing natural resource consumption and waste disposal. However, it may slightly affect the workability and compressive strength of concrete, which can be addressed by removing adhered mortar or sealing pores. Studies have shown the feasibility of using recycled aggregate in structural elements.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Hebin Zheng, Pengfei Li, Guowei Ma, Qianbing Zhang
Summary: In this study, a large-scale 3D combined geomechanical model test was conducted to investigate the mechanical characteristics of linings of asymmetrically closely-spaced twin-tunnels constructed in sandy ground. Experimental results revealed that the linings were in a state of compression during excavation, with the smaller diameter tunnel lining being susceptible to bias pressure. The change in stress release direction in the middle soil pillar was identified as the main reason for the stress state change in linings. Furthermore, numerical analyses were performed to verify the experimental results and discuss the influences of various factors on the mechanical behaviors of the linings and stratum.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Article
Construction & Building Technology
Mohamed Amin, Ibrahim Y. Hakeem, Abdullah M. Zeyad, Bassam A. Tayeh, Ahmed M. Maglad, Ibrahim Saad Agwa
Summary: Research interest in producing sustainable ultra-high-performance concrete (UHPC) has been increasing recently. This study focuses on using recycled coarse aggregate (RCA) to replace 50% of the total natural coarse aggregate (NCA). The addition of carbon nanofiber (CNF) and steel fibers (SFs) improves the concrete properties, but also negatively affects workability.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Review
Construction & Building Technology
Larissa Arakawa Martins, Veronica Soebarto, Terence Williamson
Summary: Personal comfort models have been shown to predict specific thermal comfort requirements more accurately than aggregate models, but there is a lack of diversity in building types, climate zones, seasons and participants involved in developing these models. There is also a lack of a unified and systematic framework for modeling development and evaluation, highlighting the challenges of black box models in the field.
BUILDING AND ENVIRONMENT
(2022)
Review
Construction & Building Technology
Raza Ali, Joon Huang Chuah, Mohamad Sofian Abu Talip, Norrima Mokhtar, Muhammad Ali Shoaib
Summary: This article reviews the application of Convolutional Neural Networks (CNN) in civil structure crack detection, emphasizing the importance of CNN in image classification and segmentation, as well as analyzing recent developments. In addition to discussing machine learning methods, it also introduces the limitations of manual processing and image processing techniques in crack detection.
AUTOMATION IN CONSTRUCTION
(2022)
