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INVESTIGATIONS ON THE interfacial zone BETWEEN AGGREGATE AND PORTLAND SLAG CEMENT PASTE

Journal of Wuhan University of Technology(Materials Science) 1994年第2期9卷 22-28页

作者：余其俊胡明德钱进夫王旭陶从喜 Wuhan Univ of Technology Wuhan China

1 he composition and structure of the interfacial zone be-tween aggregate and Portland slag cement paste as well as the orienta-tion coefficient of portlandite (ICH) have been studied by means of XRD and SEM. The results show that the main components in the in-terfacial zone are C-S-H gel, portlandite and AFt as well as unhy-drated clinder particles. Compared with Portland cement, there are more C-S-H gel and less portlandite in the zone and the portlandite crystallizes badly with lower ICH in a narrower region . After adding 5. 0% silica fume to the cement , the orientation of portlandite in the zone disappears; after 90d, the bond strength between #425 Portland slag cement paste and aggregate approximately attains that between # 525 Portland ciment paste and aggregate.

关键词： interfacial zone aggregate slag cement paste

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INVESTIGATIONS ON THE interfacial zone BETWEEN AGGREGATE AND PASTE OF PORTLAND CEMENT

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Journal of Wuhan University of Technology(Materials Science) 1993年第1期8卷 47-57页

作者：余其俊胡明德王旭钱进夫 Dept. of Mater. Sci. Wuhan Univ. of Tech

The composition and structure of the inter facial zone between aggregate and paste of Portland cement as well as the orientation coefficient of portlandite ( Icn ) were preliminarily studied by XRD and SEM methods. The main products in the zone are C -S-H gel, portlandite, AFt and pores, micro-cracks as welt as unhydrated portland cement clinker particles. Potlandite not only grows well but exists in orientating forms, and near the interface it exists in a state parallel to the surface of aggregate by its (001) lattice plane. Icn rises with the increase of cement water ratio (w/c) and the development of the cement hydration. The higher the w/c, the more the pores and micro-cracks in the zone. w/c bears an exact relation to the decrease of bond strength. Icn, is decreased when 5. 0% silica fume is added to cement. Bond strengths at early ages are reduced by adding 0. 5% FDN (one kind of water-reducing admixture) due to the retarded hydration of cement, but they will increase continually and become greater than those of other samples after 28 days.

关键词： aggregate paste of portland cement interfacial zone composition structure portlandite.

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The effects of mismatch fracture properties in encapsulation-based self-healing concrete using cohesive-zone model

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Frontiers of Structural and Civil Engineering 2020年第3期14卷 792-801页

作者： Luthfi Muhammad MAULUDIN Chahmi OUCIF Timon RABCZUK Institute of Structural Mechanics Bauhaus University of WeimarWeimar 99423Germany Department of Civil Engineering Politebiik Negeri Bandung(POLBAN)Bandung 40012Indonesia Division of Computational Mechanics Ton Due Thang UniversityHo Chi Minh CityVietnam Faculty of Civil Engineering Tori Due Thang UniversityHo Chi Minh CityVietnam

Finite element analysis is developed to simulate the breakage of capsule in capsule-based self-healing concrete.A 2D circular capsule with different core-shell thickness ratios embedded in the mortar matrix is analyzed numerically along with their interfacial transition ***-thickness cohesive elements are pre-inserted into solid elements to represent potential *** study focuses on the effects of mismatch fracture properties,namely fracture strength and energy,between capsule and mortar matrix into the breakage likelihood of the *** extensive simulations of 2D specimens under uniaxial tension were carried out to investigate the key features on the fracture patterns of the capsule and produce the fracture maps as the *** developed fracture maps of capsules present a simple but valuable tool to assist the experimentalists in designing appropriate capsule materials for self-healing concrete.

关键词： self-healing concrete interfacial zone capsule materials cohesive elements fracture maps

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Layers of interstitial fluid flow along a“slit-shaped”vascular adventitia

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2021年第8期22卷 647-663页

作者： Hongyi LI You LYU Xiaoliang CHEN Bei LI Qi HUA Fusui JI Yajun YIN Hua LI Cardiology Department Xuanwu HospitalCapital Medical UniversityBeijing 100053China Cardiology Department Beijing HospitalNational Center of GerontologyInstitute of Geriatric MedicineChinese Academy of Medical SciencesBeijing 100730China Radiology Department China-Japan Friendship HospitalBeijing 100029China Department of Engineering Mechanics Tsinghua UniversityBeijing 100084China Institute of Computing Technology Chinese Academy of SciencesBeijing 100190China

Interstitial fluid(ISF)flow through vascular adventitia has been discovered ***,its kinetic pattern was *** used histological and topographical identification to observe ISF flow along venous vessels in *** magnetic resonance imaging(MRI)in live subjects,the inherent pathways of ISF flow from the ankle dermis through the legs,abdomen,and thorax were enhanced by paramagnetic *** fluorescence stereomicroscopy and layer-by-layer dissection after the rabbits were sacrificed,the perivascular and adventitial connective tissues(PACTs)along the saphenous veins and inferior vena cava were found to be stained by sodium fluorescein from the ankle dermis,which coincided with the findings by *** direction of ISF transport in a venous PACT pathway was the same as that of venous blood *** confocal microscopy and histological analysis,the stained PACT pathways were verified to be the fibrous connective tissues,consisting of longitudinally assembled ***-time observations by fluorescence stereomicroscopy revealed at least two types of spaces for ISF flow:one along adventitial fibers and another one between the vascular adventitia and its covering *** nanoparticles and surfactants,a PACT pathway was found to be accessible by a nanoparticle ofinterfacial tension might play an essential role in layers of continuous ISF flow along vascular vessels.A hypothetical"gel pump"is proposed based on interfacial tension and interactions to regulate ISF *** experimental findings may inspire future studies to explore the physiological and pathophysiological functions of

关键词： Vascular adventitia Interstitial fluid Connective tissue interfacial zone

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