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pore characteristic Design Method of High-strength Pervious Concrete Based on the Mechanical Properties and Rainstorm Waterlogging Resistance

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Journal of Wuhan University of Technology(Materials Science) 2023年第3期38卷 567-574页

作者：朱平华 SHI Zhihao LIU Hui YAN Xiancui YANG Lei ZONG Meirong Department of Civil Engineering Changzhou UniversityChangzhou 213164China

High-strength pervious concrete(HSPC) with porosity ranging from 0.08% to 2.011% was prepared. The mechanical properties and rainstorm waterlogging resistance of HSPC were evaluated,and a design method of HSPC pore characteristics(porosity and pore diameter) based on the mechanical properties and rainstorm waterlogging resistance was proposed. The results showed that the reduction of effective cross-sectional area caused by artificial channels was the main factor affecting flexural strength but had limited influence on compressive strength. Compared with the concrete matrix without artificial channels,the compressive strength of HSPC with porosity of 2.011% decreased by 7.4%, while the flexural strength decreased by 48.3%. The permeability coefficient of HSPC can reach 16.35 mm/s even at low porosity(2.011%).HSPC can meet the requirements of no rainstorm waterlogging, even if exposed to 100-year rainstorms. When the mechanical properties and rainstorm waterlogging resistance are compromised, the recommended porosity ranges from 1.1% to 3.5%, and the recommended pore diameter ranges from 0.8 to 2.7 mm.

关键词： pervious concrete artificial channel pore characteristic permeability coefficient rainstorm waterlogging

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Biomimetic construction of oriented lamellar Col/nHAP composite scaffolds and mediation of macrophages to promote angiogenesis and bone regeneration

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Frontiers of Materials Science 2023年第4期17卷 127-146页

作者： Tingting Huang Tao Huang Pin Luo Di Xiao Yiping Huang Shenyu Yang Rong Zeng Mei Tu College of Chemistry and Materials Science Jinan UniversityHuangpu Road 601Guangzhou 510632China Medical 3D Printing Center The First Affiliated Hospital of Zhengzhou UniversityZhengzhou 450001China

pore characteristics have been identified as key design parameters for *** strategy reported here is to create an appropriate immune microenvironment by regulating pore characteristics of scaffolds,thereby promoting early angiogenesis and enhancing osteogenesis.A series of collagen/nanohydroxyapatite(Col/nHAP)composite scaffolds with ordered lamellar structures and different layer spacings were prepared by mimicking the ordered lamellar topology of the bone *** research indicated that the layer spacing and ordered topology of the scaffold exerted an important influence on phenotype transformation of macrophages and the secretion of angiogenic *** Col/nHAP-O(135)with large layer spacing not only supported cell attachment and diffusion in vitro,but also promoted early angiogenesis by timely switching from M1 to M2 macrophage *** vivo data showed that the layer spacing and the ordered structure of the scaffold synergistically regulated the inflammatory response and triggered macrophages to secrete more angiogenesis related ***/nHAP-O(135)considerably promoted the neovascularization and new bone formation in the defect site,indicating that Col/nHAPO(135)could significantly enhance the osteogenic activity of stem cells with the involvement of macrophages.

关键词： pore characteristic macrophage vascularization bone regeneration

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