Enhancing the performance of recycled aggregate green concrete via a Bayesian optimization light gradient boosting machine and the nondominated sorting genetic algorithm-III

Construction and Building Materials, Год журнала: 2024, Номер 458, С. 139527 - 139527

Опубликована: Дек. 20, 2024

Язык: Английский

---

Properties of UHPC with totally recycled fine aggregates and its mixture design method

Journal of Building Engineering, Год журнала: 2025, Номер 100, С. 111769 - 111769

Опубликована: Янв. 5, 2025

Язык: Английский

---

Characterization and optimization of fresh and hardened properties of ultra-high performance geopolymer concrete

Case Studies in Construction Materials, Год журнала: 2023, Номер 19, С. e02549 - e02549

Опубликована: Окт. 5, 2023

Due to the deterioration and environmental issues of cement-based ultra-high performance concrete (UHPC), there is an increasing interest in utilizing geopolymer technology develop UHPC. Therefore, this paper presents a statistically based model using response surface methods investigate application approach design optimization (UHPGC) mixtures. Twenty mixtures were designed generated experimentally central composite (CCD) concept. Flowability, bulk density, compressive flexural strengths, microstructure investigated for various UHPGC The effects silica fume, natural sand, degree curing during thermal treatment on properties also studied. models presented herein reveal that all inputs outputs are perfectly correlated. Slag fume two key components affect mechanical while executing multi-objective optimization. change sand content has little impact UHPGC, whereas heat-curing temperature considerable geopolymerization process. From experimental results, sustainable was produced with flowability 215 mm, density 2521 kg/m3, strength 152 MPa. This study laid groundwork designing producing materials method.

Язык: Английский

---

Rheology and microstructure of lithium slag/metakaolin geopolymer pastes: Insights from particle packing and water dynamic evolution

Journal of Building Engineering, Год журнала: 2024, Номер 95, С. 110261 - 110261

Опубликована: Июль 23, 2024

Язык: Английский

---

Seismic performance of ternary composite geopolymer recycled concrete columns: Experimental study and modeling

Journal of Building Engineering, Год журнала: 2024, Номер 86, С. 108875 - 108875

Опубликована: Фев. 20, 2024

Язык: Английский

---

Sustainable ecological pervious concrete (SEPC) based on modified corn-cob coarse aggregate: Crushing morphology, strength, pore properties, and durability

Construction and Building Materials, Год журнала: 2024, Номер 426, С. 136194 - 136194

Опубликована: Апрель 9, 2024

Язык: Английский

---

Comparison of mechanical strengths and microstructure of Portland cement-calcium sulfoaluminate cement binders with cellulose ethers of different viscosities

Construction and Building Materials, Год журнала: 2024, Номер 437, С. 137022 - 137022

Опубликована: Июнь 12, 2024

Язык: Английский

---

Study on Frost Resistance and Interface Bonding Performance through the Integration of Recycled Brick Powder in Ultra-High-Performance Concrete for Structural Reinforcement

Materials, Год журнала: 2023, Номер 16(21), С. 6999 - 6999

Опубликована: Ноя. 1, 2023

This study aims to address the issues posed by frost damage concrete structures in cold regions, focusing on reinforcement and repair methods increase service life of existing instead costly reconstruction solutions. Due limitations conventional terms durability strength, this research focused ultra-high-performance (UHPC) replacing part cement with recycled brick powder (RBP) strengthen ordinary C50 concrete, obtaining UHPC-NC specimens. Mechanical tests investigated bonding performance specimens under various conditions, including interface agents, surface roughness treatments, freeze–thaw after 0, 50, 100, 150 cycles a 30% replacement rate RBP. Additionally, multi-factor calculation formula for strength was established according test data, mechanism model were analyzed through an SEM test. The results indicate that decreased during salt freezing compared hydro-freezing, causing more severe damage. However, relative index splitting tensile paste showed increases 14.01% 14.97%, respectively, without agent. Using agent improved cohesiveness. interfacial can be characterized using three-zone model. After applying agent, three-zone, three-layer Overall, RBP-UHPC-reinforced damaged excellent resistance performance.

Язык: Английский

---

Fracture behaviors of sustainable recycled aggregate concrete under compression-shear loading: Laboratory test, numerical simulation, and environmental safety analysis

Case Studies in Construction Materials, Год журнала: 2024, Номер 20, С. e03328 - e03328

Опубликована: Май 22, 2024

A series of compression-shear tests were carried out to investigate the shear failure sustainable recycled aggregate concrete, and surfaces scanned by a 3D laser scanner. The effect coarse (RCA) replacement rates normal stresses on strength, mode, fracture morphology analyzed. Meanwhile, discrete element method was used study behaviors at mesoscale. Finally, carbon emission calculated evaluate RCA environment. result shows that cohesion c, internal friction angle φ all decrease as rate increases. damage RAC can be aggravated increasing rate. Fractal dimension joint roughness coefficient surface tend increase with stress. In addition, more microcracks found in rate, stress cause microcracks. Given nonlinear development stress-displacement, modified constitutive model is proposed. total emissions concrete are considering production, transportation, construction, 100% 10.2% less than natural concrete.

Язык: Английский

---

Impact of Rice Husk Ash on Geopolymer Concrete: A Literature Review and Future Directions

Case Studies in Construction Materials, Год журнала: 2025, Номер unknown, С. e04476 - e04476

Опубликована: Март 1, 2025

Язык: Английский

---