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

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

This study investigates the effects of carbonation curing and ye'elimite on the physical and chemical properties of ternesite to improve its hardening rate. The results showed that ternesite had a high carbonation activity and the additional benefit of CO2 sequestration. The carbonation products included amorphous calcium carbonate, calcite, aragonite, gypsum, and either C-S-H gel or silica gel. The

To improve the durability of geopolymer recycled aggregate concrete based on waste concrete powder (WCP), and realize its application and promotion, this study utilized WCP, fly ash (FA), and ground granulated blast-furnace slag (GGBS) as raw materials, and recycled concrete aggregate (RCA) as aggregate, with Nano-SiO2 as the modifying material to prepare WCP-based geopolymer recycled concrete (WCPGRC)

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

Crystallographic defects play a crucial role in cement hydration, with initial dissolution being dominated by the formation of etch pits that rely on the intersection of defects on surfaces. However, the defects present in cement particles have remained a mystery due to the lack of detailed direct observation at the atomic scale. In this study, we used scanning transmission electron microscopy to unravel

In karst areas, groundwater has high concentrations of carbon dioxide. It causes decalcification of cement-based materials by reacting with calcium hydroxide and calcium silicate hydrate. Therefore, the corrosion by CO2-rich groundwater has become a significant concern as it may reduce the service life of concrete structure. Based on the chemical reactions, the corrosion can be divided into leaching

The destabilization together with boundary chloride ions releasing leads to the corrosion of steel bars, posing nonnegligible risks to the durability of structures. This work attempted to design the typical pore solution of underground constructions via methods of combining NaCl with Na2SO4 along with conducting a stray current continuously. The bound chloride stability of mortar under the action of

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

C-S-H seeds are highly-efficient in promoting hydration but not compromising the long-term performances of cement. Unfortunately, mechanisms of the C-S-H seeds properties affecting the early-age performances of cement are not very well understood. In this study, the influence of hydrothermal synthetic conditions on the C-S-H seeds properties is firstly investigated, followed by revealing the correlations

The paper presents a series of impact experiments performed on reinforced concrete (RC) beams with and without stirrups and additionally without and with lateral strengthening layers made of two types of strain-hardening cement-based composites (SHCC). The impact tests were performed in an advanced drop tower facility with accelerated steel projectiles. Four impact velocities were applied, ranging

The implementation of extrusion-based 3D concrete printing (3DCP) in large-scale constructions is currently limited by concerns regarding rheology control and the sustainability of this process. To address these issues, this study presents an approach to develop limestone-calcined clay-based cementitious (LC3) materials accelerated by Ca(NO3)2 solution in an inline static mixer-based 3DCP setup. Using

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

This study established a new transport model by using the COMSOL-IPHREEQC interface to simulate the changes in the morphology of hydrated cement paste due to the diffusion of carbon dioxide and chloride ion. A series of constitutive models such as the cement hydration model (to compute the dissolution rate of each clinker mineral), thermodynamic model (to perform the hydration reaction, reaction due

This study investigates the macro- and micro-characteristics of the geopolymers to verify the feasibility of prediction of compressive strength via quantitatively adjusting the amorphous phase content (APC) and particle size distribution (PSD) of raw material. The optimization of PSD through the sieving method does not reach the intended compressive strength compared to the reference, while controlling

In marine engineering, infrastructures are facing serious issues of deterioration resulted largely from concrete cracking due to the hostile seawater environment. Microbial induced carbonate precipitation (MICP) is an effective and environmentally friendly way to achieve self-healing of concrete cracks. However, the formation and structure of MICP products for crack healing in seawater remain unclear

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

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