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Packing and film thickness theories for the mix design of high-performance concrete

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2016年第10期17卷 759-781页

作者： Pui-Lam NG Albert Kwok-Hung KWAN Leo Gu LI Department of Civil Engineering The University of Hong Kong Pokfulam Hong Kong China Faculty of Civil engmeering Vilnius Gediminas Technical University Vilnius Lithuania schoo of cicil and transportation engmeering Guangdong University of Technology Guangzhou 510006 China

A high-performance concrete （HPC） is required to have superior performance in various aspects such as workability,strength, durability, dimensional stability, segregation stability, and passing ability. The mix design of HPC is rather complicatedbecause the number of ingredients in HPC is usually more than those in conventional concrete and some of the required propertiesare conflicting with each other in the sense that improvement in one property would at the same time cause impairment of anotherproperty. However, there is still lack of understanding regarding how the various mix parameters should be optimised forachieving best overall performance. Most practitioners are still conducting mix design primarily through trial concrete mixing,which is laborious, ineffective, and often unable to timely respond to fluctuations in the properties of raw materials. To addressthese issues, the authors have been developing the packing and film thickness theories of concrete materials, in order to revamp themix design philosophy of HPC in terms of the water film thickness （WFT）, paste film thickness （PFT）, and mortar film thickness（MFT） in the concrete. Based on the findings from an extensive experimental programme, suitable ranges ofWFT, PFT, and MFThave been recommended.

关键词： Concrete mix design, Concrete science, Film thickness, High-performance concrete, Packing density, Sustainability

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Three-dimensional finite difference analysis of shallow sprayed concrete tunnels crossing a reverse fault or a normal fault: A parametric study

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Frontiers of Structural and Civil Engineering 2020年第4期14卷 998-1011页

作者： Masoud RANJBARNIA Milad ZAHERI Daniel DIAS Department of Geotechnical Engineering Faculty of Civil EngineeringUniversity of TabrizTabrizIran schoo of Automotive and transportation Engineering Hefei University of TechnologyHefei 230009China Universite Grenoble Alpes Grenoble F-38000France

Urban tunnels crossing faults are always at the risk of severe *** this paper,the efects of a reverse and a normal fault movement on a transversely crossing shallow shotcreted tunnel are investigated by 3D finite difference *** verifying the accuracy of the numerical simulation predictions with the centrifuge physical model results,a parametric study is then *** is,theleffects of various parameters such as the sprayed concrete thickness,the geo-mechanical properties of soil,the tunnel depth,and the fault plane dip angle are studied on the displacements of the ground surface and the tunnel structure,and on the plastic strains of the soil mass around *** results of each case of reverse and normal faulting are independently discussed and then compared with each *** is obtained that deeper tunnels show greater displacements for both types of faulting.

关键词： urban tunnel sprayed concrete reverse fault normal fault finite difference analysis

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