Recycled large aggregate self-compacting concrete (RLA-SCC) within multiple weak areas. These weak areas have poor resistance to chloride ion erosion, which affects the service life of RLA-SCC in the marine environmen...Recycled large aggregate self-compacting concrete (RLA-SCC) within multiple weak areas. These weak areas have poor resistance to chloride ion erosion, which affects the service life of RLA-SCC in the marine environment. A three-dimensional multi-phase mesoscopic numerical model of RLA-SCC was established to simulate the chloride ions transportation in concrete. Experiments of RLA-SCC immersing in chloride solution were carried out to verify the simulation results. The effects of recycled large aggregate (RLA) content and RLA particle size on the service life of concrete were explored. The results indicate that the mesoscopic numerical simulation results are in good agreement with the experimental results. At the same depth, the closer to the surface of the RLA, the greater the chloride ion concentration. The service life of RLA-SCC in marine environment decreases with the increase of RLA content. Compared with the service life of 20% content, the service life of 25% and 30% content decreased by 20% and 42% respectively. Increasing the particle size of RLA can effectively improve the service life of RLA-SCC in chloride environment. Compared with the service life of 50 mm particle size, the service life of 70 mm and 90 mm increased by 61% and 163%, respectively. .展开更多
To the Editor,Half a century ago,one of the most important theoretical physicists who shaped the field of condensed matter physics,Professor Philip Anderson,expressed in his landmark article“More is Different”[1]tha...To the Editor,Half a century ago,one of the most important theoretical physicists who shaped the field of condensed matter physics,Professor Philip Anderson,expressed in his landmark article“More is Different”[1]that“...the behavior of large and complex aggregates of elementary particles,it turns out,is not to be understood in terms of a simple extrapolation of the properties of a few particles.Instead,at each level of complexity entirely new properties appear...”.The concept“More is Different”emphasized the significance of emergence in complex systems,where emergent behaviors and properties that cannot be found from the individual parts.Professor Anderson’s own research in condensed matter physics also reflects the importance of emergence and complexity science.He was most concerned about how complex phenomena emerge from simple systems[2,3].展开更多
文摘Recycled large aggregate self-compacting concrete (RLA-SCC) within multiple weak areas. These weak areas have poor resistance to chloride ion erosion, which affects the service life of RLA-SCC in the marine environment. A three-dimensional multi-phase mesoscopic numerical model of RLA-SCC was established to simulate the chloride ions transportation in concrete. Experiments of RLA-SCC immersing in chloride solution were carried out to verify the simulation results. The effects of recycled large aggregate (RLA) content and RLA particle size on the service life of concrete were explored. The results indicate that the mesoscopic numerical simulation results are in good agreement with the experimental results. At the same depth, the closer to the surface of the RLA, the greater the chloride ion concentration. The service life of RLA-SCC in marine environment decreases with the increase of RLA content. Compared with the service life of 20% content, the service life of 25% and 30% content decreased by 20% and 42% respectively. Increasing the particle size of RLA can effectively improve the service life of RLA-SCC in chloride environment. Compared with the service life of 50 mm particle size, the service life of 70 mm and 90 mm increased by 61% and 163%, respectively. .
文摘To the Editor,Half a century ago,one of the most important theoretical physicists who shaped the field of condensed matter physics,Professor Philip Anderson,expressed in his landmark article“More is Different”[1]that“...the behavior of large and complex aggregates of elementary particles,it turns out,is not to be understood in terms of a simple extrapolation of the properties of a few particles.Instead,at each level of complexity entirely new properties appear...”.The concept“More is Different”emphasized the significance of emergence in complex systems,where emergent behaviors and properties that cannot be found from the individual parts.Professor Anderson’s own research in condensed matter physics also reflects the importance of emergence and complexity science.He was most concerned about how complex phenomena emerge from simple systems[2,3].
