Advancing environmental sustainability in construction through innovative low-carbon, high-performance cement-based composites: A review

Materials Today Sustainability, Год журнала: 2024, Номер 26, С. 100712 - 100712

Опубликована: Фев. 13, 2024

The evolution of concrete materials faces challenges in meeting the mechanical demands contemporary architectural structures due to limitations conventional and impracticalities ultra-high-performance concrete. Addressing this, exploration Low-Carbon, High-Performance Cement-Based Composites (LCHPCC) emerges as a strategic avenue. This paper investigates diverse within LCHPCC realm, emphasizing material selection innovative processes bolster performance sustainability. study delves into large-volume pozzolanic cementitious materials, including LC3 system, inert filler powders, alkali-activated systems. It underscores critical considerations for optimizing powder utilization low-carbon methodologies. Furthermore, enhancing aggregate system with fine coarse aggregates enhances high-performance characteristics LCHPCC. Incorporating recycled waste fibers significantly increases properties Additionally, integration specific chemical additives nanomaterials not only elevates but also broadens application potential A life-cycle assessment analysis practical validation case studies demonstrate substantial advantages over traditional concrete, its sustainable attributes. offers balanced proposition ongoing development aligning principles construction.

Язык: Английский

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Efficacy of Various Accelerated Carbonation Techniques to Improve Recycled Concrete Aggregates: A Comprehensive Review

Journal of Building Engineering, Год журнала: 2024, Номер 95, С. 110257 - 110257

Опубликована: Июль 23, 2024

This study presents a critical review to evaluate the comparative efficacy of different accelerated carbonation techniques used improve properties recycled concrete aggregates (RCA). Four methods practised in published research are standard (SC), pressurized (PC), flow through (FC) and wet (WC). These comprehensively discussed their effects on physical mechanical carbonated RCAs evaluated. The such as porosity, water absorption, density, aggregate crushing value compressive strength were evaluated with various parameters duration, pressure, gas rate, particle size. Comparison revealed that achieved optimal efficiency shorter period, while effectively reduced porosity greater degree longer duration. Longer CO2 exposure improved effectiveness standard, pressurized, flow-through methods, whereas extended performance, which is likely due dissolution products solution. Wet relatively simple easy control compared other needed controlled environment for pre-conditioning carbonation. Regarding impact RCA, both positive negative observed underlying mechanisms behind these contrasting influences critically analysed discussed. While depends factors, this offers comprehensive understanding four distinct performances based percentage improvements RCA. Finally, some recommendations future studies provided identified knowledge gaps.

Язык: Английский

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Optimally leveraging depth features to enhance segmentation of recyclables from cluttered construction and demolition waste streams

Journal of Environmental Management, Год журнала: 2024, Номер 354, С. 120313 - 120313

Опубликована: Фев. 16, 2024

This paper addresses the critical environmental issue of effectively managing construction and demolition waste (CDW), which has seen a global surge due to rapid urbanization. With advent deep learning-based computer vision, this study focuses on improving intelligent identification valuable recyclables from cluttered heterogeneous CDW streams in material recovery facilities (MRFs) by optimally leveraging both visual spatial features (depth). A high-quality RGB-D dataset was curated capture MRF stream complexities often overlooked prior studies, comprises over 3500 images for each modality more than 160,000 dense object instances diverse materials with high resource value. In contrast former studies directly concatenate RGB depth features, introduces new fusion strategy that utilizes computationally efficient convolutional operations at end conventional segmentation architecture fuse colour information. avoids cross-modal interference maximizes use distinct information present two different modalities. Despite clutter diversity objects, proposed RGB-DL achieves 13% increase accuracy 36% reduction inference time when compared direct concatenation features. The findings emphasize benefit incorporating geometrical complement cues. approach helps deal varied nature streams, enhancing automated recognition improve MRFs. This, turn, promotes solid management efficiently concerns.

Язык: Английский

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Effects of CO2 curing methods on frost resistance and mechanical properties of recycled aggregate concrete

Case Studies in Construction Materials, Год журнала: 2024, Номер 20, С. e02973 - e02973

Опубликована: Фев. 11, 2024

Recycled aggregate concrete, as a construction material, can be applied to structural components (beams, slabs, columns, and foundations), auxiliary components, temporary facilities with strength grades ranging from C30 C50. Today, the world is facing an increasing pressure of greenhouse gas emissions. Utilizing carbon dioxide for curing recycled aggregates contributes achieving reduction goals. Freeze damage cause deterioration mechanical properties surface spalling concrete (RAC). This study investigated influence three different CO2 methods, standard (CC group), pre-saturated Ca(OH)2 immersion (HH whole specimen (CRR on RAC subjected freeze-thaw cycles. The results revealed that all methods improved peak stress elastic modulus by 12.3%-13.7% 19.2%-31.5%, respectively. HH group suffered least mass loss rate experienced most improvement in relative dynamic modulus. impermeability was descending order > CC CRR group. It should pointed out lower initial water-cement (w/c) ratio exhibited better permeability resistance. Compared reference group, CC, HH, groups showed respective 49.0%-58.7%, 55.8%-72.6%, 45.5%-46.8% capillary water absorption coefficients after being methods. Among groups, w/c 0.35 0.55 resistance chloride ion penetration (which further reduced 9.4%-31.6% 19.2%-41.1%, respectively).

Язык: Английский

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Recycling excavated soil waste into low-carbon alkali-activated materials

Waste Management, Год журнала: 2025, Номер 197, С. 61 - 75

Опубликована: Фев. 22, 2025

Язык: Английский

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Environmental and Economic Viability of Using Concrete Block Wastes from a Concrete Production Plant as Recycled Coarse Aggregates

Materials, Год журнала: 2024, Номер 17(7), С. 1560 - 1560

Опубликована: Март 28, 2024

The construction sector must incorporate the circular economy to improve sustainability and efficiency. use of recycled aggregates (RAs) as a substitute for natural (NAs) is currently being investigated expected yield considerable benefits in future. objective this research evaluate environmental economic using coarse (RCAs) different 1 m3 samples concrete, substituting aggregate (NCAs) with RCAs percentages. generally come from treatment demolition wastes (CDWs). However, research, are concrete block (CBWs) generated by production plant. Among most notable results that compared no RCAs, alternatives which have replaced 50% NCAs leads an average decrease impact category statistics −3.30%. In contrast existing literature on subject, process producing efficiency improvements categories such abiotic depletion fossil fuels (−58.72%) global warming potential (−85.13%). This because transport process, key factor determining viability RAs instead NAs, was eliminated. terms, there slight financial cost quantity increases. maximum 0.23€/m3 studied. Combining both aspects resulted reduction 0.420 g CO2/€cent, means fewer CO2 emissions per unit when RCAs. conclusion, these intended further knowledge field NAs order help achieve find alternative particular type business waste.

Язык: Английский

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Exploring Economic and Environmental Impacts of Recycled Aggregate Concrete Using Particle Swarm Optimization Algorithm

Journal of Cleaner Production, Год журнала: 2024, Номер unknown, С. 143713 - 143713

Опубликована: Сен. 1, 2024

Язык: Английский

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Physical-chemical characterization of construction and demolition waste powder with thermomechanical activation for use as supplementary cementitious material

Construction and Building Materials, Год журнала: 2024, Номер 437, С. 136907 - 136907

Опубликована: Июнь 12, 2024

Язык: Английский

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Porous Mortars Incorporating Active Biochar from Olive Stone Waste and Recycled Masonry Aggregate: Effects of Accelerated Carbonation Curing

Materials, Год журнала: 2025, Номер 18(4), С. 904 - 904

Опубликована: Фев. 19, 2025

This study investigated the use of activated biochar derived from olive stone waste and recycled masonry aggregates in porous mortar mixtures assessed their behaviour under accelerated carbonation curing conditions. Three were produced, incorporating 0%, 5%, 10% by volume. The physical, chemical, mechanical properties mortars analysed, including compressive strength, flexural water absorption, porosity, CO2 capture capacity. Additionally, calorimetry tests performed on cement pastes with 0.5%, 1%, 3%, 15%, 20% to evaluate impact setting times ensure compatibility between cement. results showed that addition improved properties, particularly curing, whereas active (AcB) significantly enhanced strengths. Furthermore, incorporation boosted efficiency, mix showing up 147% higher uptake, compared a control. These findings suggest can be effectively utilised develop sustainable construction materials thereby contribute carbon sequestration reduction environmental impacts. research fills gaps current knowledge stones cement-base

Язык: Английский

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A review for accelerated carbonation improvement of recycled concrete coarse aggregates and the meta-analysis of environmental benefit assessment and cost analysis of concrete so produced

Journal of Building Engineering, Год журнала: 2025, Номер unknown, С. 112649 - 112649

Опубликована: Апрель 1, 2025

Язык: Английский

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