Construction and demolition waste (CDW) represents a high environmental impact. This is strongly related to the chosen alternatives for the disposal of these waste. In this paper, different strategies are analysed in order to achieve the most eco-friendly path for the treatment of the CDW, in order to promote both the reduction of environmental impact and the implementation of the circular economy

The objective of this paper was to analyze the seismic behavior of replaceable concrete coupling beams (RCCB) with reinforced concrete (RC) slabs and compare them with replaceable steel coupling beams (RSCB). And it focused on the damage of the slab and the influence of slab configurations on the mechanical properties of coupling beam. Five full-scale specimens were fabricated for failure test, among

The significant share of buildings from total energy consumption across the world has been mentioned and emphasized very well by several scholars. In this regard, there have been major developments...

Timely and accurate extraction of pavement crack information is crucial to maintain service conditions and structural safety for infrastructures and reduce further road maintenance costs. Currently, deep learning techniques for automated pavement crack detection are far superior to traditional manual approaches in both speed and accuracy. However, existing deep learning models may easily lose crack

This study investigated the impact of five commonly employed water-reducing agents on the fluidity of cement paste at varying dosages firstly. The agents considered in this research are sodium lignosulfonate (LS), naphthalene superplasticizer (PNS), aliphatic superplasticizer (HSB), and two types of polycarboxylate superplasticizers (PCEs), specifically PCE-5C and PCE-6C. Subsequently, the impact of

The medium-depth geothermal cascade utilization technology plays a crucial role in achieving low-carbon and low-cost heat supply. However, the traditional rigid regulation method faces challenges in ensuring real-time supply-demand balance due to the district heating demand being influenced by outdoor weather and the complexity of the operating parameters of the medium-depth geothermal cascade heating

Fitness centers have become famous for maintaining a healthy lifestyle. They require different thermal comfort conditions and higher fresh air supply rates than other indoor spaces. However, even well-designed centers may cause discomfort due to factors such as design decisions, ventilation, overheating, and overcrowding. The standards for fitness centers do not consider these specific requirements

Occupant-centric HVAC control places a premium on factors including thermal comfort and electricity cost to guarantee occupant satisfaction. Traditional approaches, reliant on static models for occupant behaviors, fall short in capturing intra-day behavioral variations, resulting in imprecise thermal comfort evaluations and suboptimal HVAC energy management, especially in multi-zone systems with diverse

This paper proposes a novel multi-criteria decision support framework for climate change-sensitive evaluation of building thermal comfort performance in European buildings. The proposed framework considers various comfort categories based on building use and condition, comfort models based on building operation, sensitivity to climate change, key performance indicators, and their thresholds. The proposed

Wood, a time-honored construction material prized for its exceptional properties, has been in use for millennia. Its enduring popularity is attributed to its remarkable strength, aesthetic appeal, and favorable environmental footprint. However, wooden structures are susceptible to various defects and imperfections that pose threats to their structural integrity, durability, and safety. These issues

A non-iterative direct displacement-based method is proposed for the design of dissipative bracings for seismic retrofit of gravity-load-designed (GLD) reinforced concrete (RC) frames. The design methodology aims at limiting the interstorey drifts of the GLD frame to prevent damage in the existing columns, by appropriately designing both stiffness and damping of the bracings. The method is based on

High altitudes have harsh, complex climates and changing environments. These conditions considerably challenge the service life of concrete structures. The engineering quality of concrete structures at high altitudes can be improved by scientific curing regimes; similarly, carbon emissions can be reduced throughout their life cycle. In this paper, the effect of the early curing environment on the macroscopic

Energy efficiency in buildings and the mitigation of CO2 are key factors in the advancement of contemporary architecture, which includes aesthetic elements such as skylights, fa?ades, and windows. Therefore, in this work the impact of different glazing types on energy savings and CO2 reduction was presented. A comparative analysis was conducted taking into account the climate-oriented approach in a

The development of modern tall and irregular buildings has seen increased slenderness and axial force in columns that seriously jeopardize the seismic safety of the structures. Due to the restrictions of the testing facilities, existing experimental studies on slender RC columns under high-axial force are limited and primarily based on small cross-section specimens bent in single curvature and loaded

Monthly resolution has been widely used in energy performance analysis, particularly in the context of Change-Point Linear Models (CPM) for M&V, campus-wise, or city-scale analysis. This preference stems from the ease of data collection from utility bill information. However, a challenge arises from the varying utility billing periods for each meter in buildings, leading to a discrepancy between actual

The variable refrigerant flow (VRF) air conditioner is widely used because it can control indoor air conditioning units individually, allowing for efficient energy use. However, accurately modeling a VRF system is challenging because of its complex operating mechanism. Despite this challenge, manufacturers often only provide basic system information that adheres to regulatory standards, and they do

To explore the feasibility of geogrid reinforcement as a promising countermeasure to improve the liquefaction and post-liquefaction resistance of calcareous sand, extensive undrained monotonic and multi-stage triaxial tests were performed on unreinforced and geogrid reinforced calcareous sand with different relative densities. The test results illustrate that pore pressure generation curves of unreinforced

A lightweight PCSNet-based segmentation model is developed to efficiently overcome insufficient performance in feature extraction and boundary loss information resulting from sampling operations. The proposed approach incorporates two key components: an enhanced shuffle unit and an improved inverted residual architecture to effectively reduce model parameters and enhance inference time. Additionally

As reinforcing nano-fillers, graphene nanoplatelets (GNPs) have shown considerable promise for developing high-performance cement composites. However, the influence of GNP orientation and pores on the compressive and damage evolution of the GNP reinforced cement composites (GNPRCCs) remains unclear. This work employs three-dimensional finite element modeling along with experiments to provide fundamental

This paper proposes a fast manual calculation method for determining the critical collapse resistance (CCR) of steel frame structures caused by an edge column loss. The critical collapse deformation (CCD) of the frame structure in an edge column loss is determined prior to calculating the CCR. Systematic parametric analysis is performed to examine the impacts of floor aspect ratio, slab rebar, slab

The incorporation of bacterial biomass to cementitious materials improves the strength and permeability properties by altering the pore structure. Previous studies report significant improvement in the strength properties of concrete by using ureolytic bacteria. However, several challenges limit its application in the field, and one such limitation is the release of ammonia gas, a harmful foul-smelling

Stakeholders such as urban planners and energy policymakers use building energy performance modeling and analysis to develop strategic sustainable energy plans with the aim of reducing energy consumption and emissions from the built environment. However, inconsistent energy data and the lack of scalable building models create a gap between building energy modeling and traditional planning practices

The heart rate variability (HRV) features extracted from an electrocardiogram (ECG) signal have been widely used to help improve the performance of thermal comfort models, with the ECG signal denoising method being very important. In this study, 20 volunteers were recruited for experiments in a well-controlled chamber. Their ECG signals (a total of 6,000,000 sets of data) were collected under stable

The longitudinal behavior of a shield tunnel is essential for analyzing its deformation and internal forces under surcharge. This study involved the design and construction of a reduced-size indoor model of a tunnel to investigate its performance with various?initial ovalities when subjected to different?surcharges. Furthermore, a model was proposed to investigate the longitudinal deformation of the

The water inrush hazards have become one of the bottleneck problems that constrain tunnel construction. Ahead geological prospecting is the major tool to avoid geo-hazards and ensure safe, economical and efficient tunnelling. This work proposes a novel deep learning-based electrical method, which jointly inverses resistivity and chargeability to estimate water-bearing structures and water volume. Specifically

Assessing the existing condition of aging masonry houses are of high interest as the cost of retrofitting and repairing becomes significantly higher. Conventional condition assessment tools and met...

Inorganic mineral-based self-healing agents were widely used in the self-healing technology for cement-based materials. The self-made microbial self-healing agent applicable to marine environments was presented in this paper, composed of inorganic minerals and microorganisms. A comparative experiment was conducted to compare the healing ability of the self-made microbial self-healing agent with three

Underground pipelines are crucial infrastructure that can deteriorate over time. Trenchless techniques have emerged as an efficient and eco-friendly solution for pipeline rehabilitation without excavation. This paper reviews the academic progress of trenchless technologies for underground pipeline rehabilitation through a systematic literature search across major databases. The objective is to summarize

The reasonable setting of the slurry pressure is very important for the safety of shield tunnel construction. In view of the common geological problems of high water pressure and multiple fracture zones in water conveyance tunnels in China, the instability mechanism of the shield excavation face in these formations remains unclear. In this paper, based on the Pearl River Delta Water Resources Allocation

Cracks are one of the most common pavement surface diseases. Timely repair of these cracks is imperative to prevent a substantial reduction in the pavement’s service life. However, the persistent challenges in crack segmentation arise from factors such as thin and shallow crack characteristics, a cluttered background, and foreground distractors. In response to these challenges, a dual-path network

Ultra-high performance concrete (UHPC) encounters hindrance in pursing carbon neutrality and extended applications due to the dosage of cementitious materials and high energy consumption. To address this problem, this study utilized WGP to replace placement in the production of UHPC-WGP and invested its impact on workability, mechanical properties, and microstructure. The research results showed that

To evaluate the seismic performance of a high-rise building with transfer slab, a scaled model with a ratio of 1:15 is fabricated and shake table tests are conducted to investigate the seismic damage of the scaled model, in which the frequent, fortification, rare, and extremely rare multidimensional seismic excitations for different design targets are considered. The experimental results are analyzed

A novel semi-rigid energy dissipation connection (SEDC), capable of transitioning the precast cladding panel from a rigid connection to a flexible connection with the primary structure as the seismic action increases, is proposed in the present study. The combination of the bending part and friction part endows the connection with the ability to provide adjustable sliding force and sufficient energy

With advantages including high productivity and sustainability, modular construction has attracted increasing interest in building project developments. As modular buildings are stepping higher, the modular systems should be better designed to ensure structural safety. In such systems, different types of connections, such as module-to-module (M2M) connections, play an important role in the loading

Alkali-activated slag recycled concrete (ASRC) effectively utilises slag and construction waste; nevertheless, its poor mechanical properties limit its popularization and application in construction engineering. Therefore, the ASRC–filled circular steel tube column structure (ASRC–FCSTC) is innovatively proposed, and its mechanical properties and constitutive model are studied. The influence of steel

Interfacial bond behaviour of the circular concrete-filled wire-arc directed energy deposition (DED) steel tubes was investigated experimentally, in which wire-arc DED, commonly referred to as wire-arc additive manufacturing (WAAM), represents a metal 3D printing method. Firstly, a 3D laser scanning was employed to generate the 3D models of the WAAM steel components to obtain the geometric features

Along with the increasing energy consumption of space cooling, the building industry is in urgent need of the environmental-friendly and proven cooling technology. Indirect evaporative cooling (IEC) is attracting wider attention as a sustainable technology based on the heat absorption properties of evaporation. It has been demonstrated that the plate surface covered by the water membrane in the wet

To address the hysteresis in assessing the workability of conditioned soils and the inefficiency in estimating the soil volume flow rate in tunnelling practice, a novel real-time assessment and monitoring approach was proposed. Based on laser scanning technology and point cloud data analysis, the approach can monitor the workability and the volume flow rate of conditioned soils on the horizontal conveyor

Integrating various reinforcements into 3D concrete printing (3DCP) is an efficient method to satisfy critical requirements for structural applications. This paper explores an explainable ensemble machine learning (EML) method to predict the bond failure mode and strength of various reinforcements in 3DCP. To overcome the problem of insufficient experimental data for the 3DCP technology, a deep generative

In order to accurately track progress and improve efficiency in complex construction projects, it's important to effectively monitor individual tasks and measure the time taken to complete a cycle of tasks. Tunnel construction involves a variety of activities, where multiple pieces of equipment are engaged in different actions that occur simultaneously or sequentially during a single activity. This

Advances in tunnel boring machines (TBM) have leveraged applied artificial intelligence to promote sustainable and automatic tunneling construction. This paper highlights the significance of AI-based management subsystems for automatic TBM operations and presents recent key contributions in the field by identifying three key parallel subsystems: modeling, monitoring, and control. Moreover, each subsystem

Steel fiber reinforced concrete pipes are commonly used in the municipal, agricultural, and industrial fields because of their superior internal water pressure performance. However, the randomly distributed steel fibers hinder the further improvement of internal water pressure performance. To maximise the reinforcement effect of steel fibers and improve the internal water pressure performance, an external

Multi-layer aluminum foam with varying density distribution has been proven to exhibit significant blast alleviation capabilities under blast loads. Using the equivalent multiple degree of freedom (MDOF) method and rigid-perfectly-plastic-locking (RPPL) model, an analytical model for multi-layer aluminum foam protected RC (MF-RC) slabs is developed to predict displacement and energy properties. Studies

Self-consolidating concrete (SCC) is a widely used construction material known for its high workability. In general, the proportion of chemical admixture in SCC is higher than that of standard concrete, making it more susceptible to the segregation due to its low aggregate bearing capacity. To test the aggregate segregation, a variety of qualitative and quantitative methods have been proposed for either

When considering the diversity of tropical woods present in Brazil, used commercially, few are used for the production of floors, especially for decks. As a result of the disorderly exploitation of native tropical species, wood from reforestation, especially those of the Eucalyptus genus, have been used in order to meet demand. However, some properties of these woods need to be improved, such as the

This paper studies the influence of two high-performance thermal insulating materials including aerogel and phase change materials (PCM) aggregates, on the key characteristics of cementitious composites in experimental and predictive aspects. Thermal conductivity (ThC), rapid chloride migration test (RCMT), permeable pore volume, compressive strength, dry density, and microstructural analysis were