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Brittle Matrix Composites

Brittle Matrix Composites Book
Author : Francisco Montero,Erik Schlangen
Publisher : Elsevier Inc. Chapters
Release : 2012-11-12
ISBN : 0128090154
Language : En, Es, Fr & De

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Book Description :

In this paper a model is presented to simulate fracture of fibre reinforced cement based materials. The model is based on a lattice-type fracture model. Fibres are explicitly implemented as separate elements connected to the cement matrix via special interface elements. With the model multiple cracking and ductile global behaviour are simulated of the composite material. Variables in the model are the fibre dimensions and properties, the fibre volume in the composite, the bond behaviour of fibres and matrix and the cement matrix properties. These properties are obtained by testing, which will be described in the paper. The model is used as a design tool for creating fibre cement based composites with any desired mechanical behaviour.

Brittle Matrix Composites 10

Brittle Matrix Composites 10 Book
Author : A M Brandt,M A Glinicki,J Olek,C K Y Leung
Publisher : Elsevier
Release : 2012-11-12
ISBN : 0857099892
Language : En, Es, Fr & De

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Book Description :

The subjects of the symposia are on composite materials behaving as brittle, normal and special conditions of exploitation. Brittle matrix composites are applied in various domains and the series of symposia are closely related to their applications in civil engineering. In the last decades their importance is increasing along with their variety and the use of most advanced methods of testing. Papers include concretes, fibre concretes and ceramics, particularly their composition, microstructure and fracture processes. Various new and advanced engineering problems are presented in the papers.

Brittle Matrix Composites

Brittle Matrix Composites Book
Author : Agnieszka J Klemm,Paul Baker,Karol Sikora
Publisher : Elsevier Inc. Chapters
Release : 2012-11-12
ISBN : 012809012X
Language : En, Es, Fr & De

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Book Description :

Construction industry like any other area of economic and social life undergoes continuous alterations and improvements in order to successfully comply with the requirements of sustainable development. Consumers demand more durable, less labour and service intensive materials at a competitive price. To meet these expectations numerous new composite materials have been developed over the last couple of decades, including cementitious materials modified by superabsorbent polymers (SAP). The paper presents part of the larger research project on the performance of cementitious mortars containing two types of superabsorbent polymers (SAP) as the internal curing agent.SAP A is a copolymer of acrylamide and acrylic acid and SAP B is a polymer based on acrylic acid. Research work presented in this paper involves macro and micro scale characterisation of polymer modified mortars. The microstructural features were studied with application of the Mercury Intrusion Porosimetry and the Scanning Electron Microscopy techniques. Analyses of pore size distribution in mortars of different ages are accompanied by the analyses of strength and autogenous shrinkage development as well as early density changes in immature mortars by the X-ray absorption method. The investigations confirmed the positive effect of SAP A on the reduction of autogenous shrinkage and microcrack propagation. Limited absorption/desorption abilities of SAP B cannot reassure continuous supply of water and hence the performance of SAP B mortars was comparable with the reference samples. The effect of both SAPs on strength development proved to be negligible.

Brittle Matrix Composites 3

Brittle Matrix Composites 3 Book
Author : Andrzej M Brandt,I.H. Marshall
Publisher : Springer
Release : 1991-08-31
ISBN : 9781851666874
Language : En, Es, Fr & De

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Book Description :

This is the third volume published in the series of proceedings of international symposia called 'Brittle Matrix Composites' organised every three years in Poland. The first Symposium, denoted as BMC1, was organised in Jablonna near Warsaw in 1985 under the auspices of the European Mechanics Committee (EUROMECH 204). The second (BMC2) took place in Cedzyna near Kielce in 1988; the present (BMC3) is being held in Warsaw in September 1991. The BMC Symposia are intended to cover mechanical problems related to three main groups of composite materials: high-strength composites, ceramics and cement-based materials. The common feature which is a link between these materials is their brittle behaviour. Brittleness has no clear definition, but it is considered as an important potential disadvantage of every material. Brittle fracture creates various situations which may be very dangerous for the safety and serviceability of structures manufactured from composite materials. Also the brittleness of non-structural elements may give rise to disadvan tageous behaviour, e.g. during transportation and montage. There are many structural and technological ways of reducing material brittleness. Their development and further improvement are of primordial importance for most applications of these composite materials. The problems considered in the series of BMC Symposia cover all aspects of brittle matrix composites: • design studies, theoretical considerations, computational methods; • prediction of behaviour, fracture mechanics and other approaches; • testing methods, test results, all types of experimental studies; • manufacturing processes, applications, observations and durability assess ments, environmental effects, etc.

Brittle Matrix Composites 9

Brittle Matrix Composites 9 Book
Author : A M Brandt,J Olek,I H Marshall
Publisher : Elsevier
Release : 2009-11-30
ISBN : 085709307X
Language : En, Es, Fr & De

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Book Description :

The subjects of the symposia are on composite materials with matrices behaving as brittle in normal or special conditions. Brittle matrix composites are applied in various domains (civil engineering, mechanical equipment and machinery, vehicles, etc.) and in the last decades their importance is increasing together with their variety. Papers include: aggregate-binder composites (concretes, fibre concretes, rocks); sintered materials (ceramics); high strength composites with brittle matrices. In principle, the general problems of structures made of composite materials are not included in the papers. Various approaches to the material engineering problems are presented in the papers.

Brittle Matrix Composites

Brittle Matrix Composites Book
Author : Piet Stroeven,Lambertus J Sluys,Nghi L.B. Le
Publisher : Elsevier Inc. Chapters
Release : 2012-11-12
ISBN : 0128090286
Language : En, Es, Fr & De

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Book Description :

This paper will discuss novel techniques for pore network exploration and the assessment of topological and geometrical characteristics relevant for durability estimation. The discussed methods are applicable to DEM-produced cementitious materials in which binder particle are realistically dispersed. This cannot be achieved by the in concrete technology popular random generator-based systems. Development of the discussed techniques was inspired by the path finding algorithms developed in robotics. The presented techniques are called double random multiple tree structuring (DraMuTS) and random node structuring (RaNoS). The path finding algorithms are adapted to the porosimetry problem and as a consequence modified to exclude time-consuming iterations. Moreover, path finding will take place starting from a large number of positions to enhance the economy of the approach.

Brittle Matrix Composites

Brittle Matrix Composites Book
Author : Mariusz Dabrowski,Michal A. Glinicki
Publisher : Elsevier Inc. Chapters
Release : 2012-11-12
ISBN : 0128090383
Language : En, Es, Fr & De

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Book Description :

The influence of aggregate type on the compressive strength, the resistance to chloride penetration and the scaling resistance with de-icing salts of concrete made with blended cements with calcerous fly ash was investigated. The range of investigation included the air entrained concrete with water to cement ratio w/c=0.45 with the prototype blended cements containing the additives of calcerous fly ash, siliceous fly ash and ground granulated blast furnace slag. Concrete specimens were cured during first 3 days in water and then in the air of 40% RH until 28 and 90 days. Frost-salt scaling tests were performed using 3% NaCl solution. The air void microstructure was quantitatively evaluated. The results revealed the influence of blended cement type on the properties of concrete with different type of aggregates.

Brittle Matrix Composites

Brittle Matrix Composites Book
Author : E Ghafari,M Bandarabadi,H Costa,E Júlio
Publisher : Elsevier Inc. Chapters
Release : 2012-11-12
ISBN : 0128090162
Language : En, Es, Fr & De

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Book Description :

Ultra-high performance concrete (UHPC) results from the mixture of several constituents giving rise to a highly complex material in hardened state. The higher number of constituents in relation to current concrete, together with a higher number of possible combinations and relative proportioning, makes the behavior of this type of concrete more difficult to predict. Until now, most of the proposed mixture design methods are based on a trial and error procedure, which is expensive and work intensive. Moreover, these methods are not efficient in predicting neither the consistency in fresh state nor the strength in hardened state, and do not consider the effect of curing on the latter. The main objective of the research study herein described is to build an analytical model, based on artificial neural networks (ANN), to predict the required performance of UHPC. Specifically, back-propagation neural networks (BPNN) are adopted to model the relation between the input and the output parameters of UHPC, for two different curing conditions, including heat treatment and water storage. In order to train the neural network, a total set of 53 different mixtures were designed. It is concluded that the developed model can be used as a reliable method to predict the performance of UHPC.

Brittle Matrix Composites

Brittle Matrix Composites Book
Author : Dominik Logoń
Publisher : Elsevier Inc. Chapters
Release : 2012-11-12
ISBN : 0128090308
Language : En, Es, Fr & De

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Book Description :

The paper presents the methods of controlling sedimentation of cement mix using D-cube flow, slump, cone immersion and electrical resistance tests. These methods make it possible to control the sedimentation of aggregates and fibers, the optimization of different admixtures and additives and the rheological properties of cement mixes. The electrical resistance test for cement composites was modified. The cube (150x 150x 150mm) was equipped with two electrodes to measure the resistance of the mix. For sedimentation measurement electrodes were placed in the upper and bottom part of the mix. Measured changes of the resistance at different depths of the mix give the information about the sedimentation of components. The main advantage of the D-cube (150x150x150 mm) flow, slump and cone immersion tests is the ability to do it without advanced measuring devices and the fact that one method is sufficient to compare the rheological properties of cement pastes, mortars and concretes.

Brittle Matrix Composites

Brittle Matrix Composites Book
Author : Daria Jóźwiak-Niedźwiedzka
Publisher : Elsevier Inc. Chapters
Release : 2012-11-12
ISBN : 0128090219
Language : En, Es, Fr & De

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Book Description :

The influence of high calcium fly ash as clinker replacement in blended cements on the resistance of concrete structures to the carbonation is presented. The paper concerns of five blended cements made with different contents of supplementary cementitious materials: high and low calcium fly ash and ground granulated blastfurnance slag and one reference cement – Portland cement. The aim was to study the carbonation depth on several concretes designed with a constant water to binder ratio and with various blended cements. Additionally, the prediction of the maximum carbonation depth was proposed. The evaluation of the microstructure was performed using optical microscopy on thin sections in transmitted light. The best results according to the resistance to carbonation achieved the concretes made with Portland-fly ash cement where 14.3 % of high calcium fly ash was used. CEM II/A-W can be used to prove the fc28 and resistance to carbonation for XC3 class.

Brittle Matrix Composites 7

Brittle Matrix Composites 7 Book
Author : A M Brandt,V C Li,I H Marshall
Publisher : Elsevier
Release : 2003-10-01
ISBN : 085709310X
Language : En, Es, Fr & De

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Book Description :

The International Symposium in Brittle Matrix Composites October 13-15, 2003 covers a wide spectrum of topics including cement based composites, ceramic composites and brittle polymer matrix composites. In the papers various topics and issues are considered such as: analytical and numerical studies related to the design of composites, prediction of behaviour and verification of strength and stability, testing methods, manufacturing processes and repair, environmental effects and durability assessment. The present volume of 55 papers proves that there are still many problems in the field of brittle matrix composites deserving theoretical and experimental investigations and that new solutions to these problems are needed for practical application in civil engineering, industrial structures, machinery and other domains.

Brittle Matrix Composites

Brittle Matrix Composites Book
Author : Andrzej Marek Brandt,Ian H. Marshall
Publisher : Unknown
Release : 1986
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Brittle Matrix Composites book written by Andrzej Marek Brandt,Ian H. Marshall, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Brittle Matrix Composites 5

Brittle Matrix Composites 5 Book
Author : Andrzej Marek Brandt
Publisher : Unknown
Release : 1997
ISBN : 9788390662732
Language : En, Es, Fr & De

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Book Description :

Download Brittle Matrix Composites 5 book written by Andrzej Marek Brandt, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Brittle Matrix Composites 4

Brittle Matrix Composites 4 Book
Author : Andrzej Marek Brandt,I. H. Marshall,Victor C. Li
Publisher : CRC Press
Release : 1996-07-01
ISBN : 9781855731868
Language : En, Es, Fr & De

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Book Description :

Download Brittle Matrix Composites 4 book written by Andrzej Marek Brandt,I. H. Marshall,Victor C. Li, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Principles of Similitude in Design of Reinforced Brittle Matrix Composites

Principles of Similitude in Design of Reinforced Brittle Matrix Composites Book
Author : Hans Henrik Bache,Aalborg Portland A/S. Cement- og Betonlaboratorie
Publisher : Unknown
Release : 1991
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Principles of Similitude in Design of Reinforced Brittle Matrix Composites book written by Hans Henrik Bache,Aalborg Portland A/S. Cement- og Betonlaboratorie, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Brittle Matrix Composites

Brittle Matrix Composites Book
Author : Anonim
Publisher : Unknown
Release : 1994
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Brittle Matrix Composites book written by , available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Statistical Aspects of the Failure of Brittle Matrix Composites Reinforced with Unidirectional Continuous Discontinuous and Time Dependent Brittle Fibers

Statistical Aspects of the Failure of Brittle Matrix Composites  Reinforced with Unidirectional Continuous  Discontinuous and Time Dependent Brittle Fibers Book
Author : M'hamed Ibnabdeljalil
Publisher : Unknown
Release : 1994
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Statistical Aspects of the Failure of Brittle Matrix Composites Reinforced with Unidirectional Continuous Discontinuous and Time Dependent Brittle Fibers book written by M'hamed Ibnabdeljalil, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Analysis of the Progressive Failure of Brittle Matrix Composites

Analysis of the Progressive Failure of Brittle Matrix Composites Book
Author : David J. Thomas
Publisher : Unknown
Release : 1995
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Analysis of the Progressive Failure of Brittle Matrix Composites book written by David J. Thomas, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

The Mechanical Behavior of a Fiber reinforced Brittle Matrix Composite

The Mechanical Behavior of a Fiber reinforced Brittle Matrix Composite Book
Author : Ellice Yeng Luh
Publisher : Unknown
Release : 1988
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download The Mechanical Behavior of a Fiber reinforced Brittle Matrix Composite book written by Ellice Yeng Luh, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.