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On the mechanisms of shrinkage reducing admixtures in self con-solidating mortars and concretes
Compared to conventional concrete, SCC have an increased paste volume, and therefore show a higher shrinkage than conventional concrete. Shrinkage reducing admixtures (SRA) are proved to have the desired effect. Better understanding the working mechanism of SRAs was a main objective of this research. The effects on cement hydration, drying and shrinkage were investigated.
Publisher: Arnd Bernd Eberhardt, 2010, Dissertation. Bauhaus-Universität Weimar, Fakultät Bauingenieurwesen
Registered on: Feb 3, 2014  |  Category: Materials Science: Shrinkage-reducing Additives

Adsorption of Polycarboxylate-based Superplasticizer onto Natural Bentonite
Adsorption of polycarboxylate-based superplasticizer on natural bentonite was investigated to better understand the interaction between admixtures and clay as impurities in mortar or concrete.
Publisher: Weishan Wang, Baicun Zheng, Zhongjun Feng, Zuiliang Deng, Lefeng Fu. Journal of Advanced Concrete Technology, Vol. 10 (2012)
Registered on: Feb 3, 2014  |  Category: Materials Science: Plasticizers for Concrete and Mortar

Certification of SRM 2492: Bingham Paste Mixture for Rheological Measurements
As measurements with rheometers can involve flow in a complex geometry, it is important that they are calibrated with a standard reference material (SRM). NIST has produced a Standard Reference material for paste (SRM 2492) as the first step for the development of a reference material for concrete rheometers. The process used to develop both the SRM 2492 and the mortar reference material is presented, including measurements, statistical analyses, and modeling. The developed SRM consists of a mixture of two components, corn syrup and fine limestone and has the texture of cement paste.
Publisher: Chiara F. Ferraris; Paul E. Stutzman; William F. Guthrie; National Institute of Standards and Technology (NIST), 2012
Registered on: Feb 3, 2014  |  Category: Materials Testing: Rheology

Examination of the hygro-mechanical stability of crystalline calcium sulfate hemihydrate : Gypsumstressing in water (German)
Publisher: Abdussaljamov Abdusasamatowitsch Bachtijor, Dissertation, 2003. Bauhaus-Universität Weimar, Fakultät Bauingenieurwesen
Registered on: Feb 2, 2014  |  Category: Materials Science: Gypsum and Anhydrite

Cement-superplasticizer interaction
Study on the influence of a polycarboxylate-ether based superplasticizer (PCE) with different architectures (side chain density, side chain length) on the rheological properties of cement suspensions.
Publisher: Anatol Zingg. Dissertation, 2008. ETH Zurich
Registered on: Feb 2, 2014  |  Category: Materials Science: Plasticizers for Concrete and Mortar

Time reverse modeling of acoustic emissions in structural concrete
Details on acoustic emission (AE). An often used application of AE analy- sis is the localization of concrete cracks and reinforcement ruptures. However, for progressed crack patterns, common localization procedures fail, because the waves have either been reflected repeatedly or experienced interference with other waves. In this dissertation a new method of AE analysis is developed which takes advantage of the wave field interferences.
Publisher: Dissertation. Kocur, Georg Karl. Swiss Federal Institute of Technology Zurich, Institute of Structural Engineering (2012)
Registered on: Feb 1, 2014  |  Category: Materials Testing: Acoustic Emission Analysis

Working mechanism of various cellulose ethers as water retention admixtures in oil well cementing and in dry-mix mortar systems
The doctoral dissertation includes three papers: (1) "Role of Colloidal Polymer Associates for the Effectiveness of Hydroxyethyl Cellulose as a Fluid Loss Control Additive in Oil Well Cement". Journal of Applied Polymer Science, Vol. 126, E25E34 (2012). (2) "Mechanistic Study on Carboxymethyl Hydroxyethyl Cellulose as Fluid Loss Control Additive in Oil Well Cement". Journal of Applied Polymer Science, Vol. 124, 23402347 (2012). (3) "Working mechanism of methyl hydroxyethyl cellulose (MHEC) as water retention agent". Cement and Concrete Research 42 (2012) 953959.
Publisher: Daniel Bülichen, Dissertation, TU München, 2013
Registered on: Feb 1, 2014  |  Category: Materials Science: Rheological additives

Flowing calcium sulphate screeds
Some "Code of Practice" are available in English.
Publisher: Industrieverband WerkMörtel e.V.
Registered on: Jan 31, 2014  |  Category: Application Technology: Anhydrite Floor Screed

Sensory-based evaluation of building product emissions
Integration into the Blue Angel award criteria and assessment scheme of the Committee for Health Evaluation of Building Products.
Publisher: Umweltbundesamt
Registered on: Jan 29, 2014  |  Category: Indoor air pollutants

The Metal Powder Company Ltd.
Producer of Aluminium powder and paste for use in light weight concrete (autoclaved aerated concrete).
Registered on: Apr 4, 2007  |  Category: Suppliers of Raw Materials: Gas Formation Agents

Wester Mineralien GmbH
Different types of fused alumina, and silicon carbide.
Registered on: Apr 6, 2006  |  Category: Suppliers of Raw Materials: Hard Aggregates

High strength concrete
Report on investigations into the effects of setting and hardening on the properties of high strength concretes, and in particular on the behaviour with restrained deformation at a young age. The shrinkage (in particular the autogenous shrinkage) as well as the release of heat of hydration and the associated strength development were investigated. [12 pages, 597 kB, PDF]
Publisher: Maria Teresa Alonso
Registered on: Jul 4, 2005  |  Category: Materials Science: Concrete

Influence of cement and additions on the quantity of alkalis available for an alkali-silica reaction
[12 pages, 1.1 MB, PDF]
Publisher: Elke Schäfer, Birgit Meng
Registered on: Jul 4, 2005  |  Category: Materials Science: Alkali-Silica Reaction in Concrete

Basic technical principles for repairing concrete drinking water supply tanks
Information on the reasons for corrosion of the thin layer mortar which was used to coat drinking water reservoirs made of concrete. The mortar became soft in spots or in whole areas after only one to two years. [14 pages, 1.0 MB, PDF]
Publisher: Peter Boos, Gerd Thielen, Cornelia Schmitt-Riegraf
Registered on: Jul 4, 2005  |  Category: Renovation and Conservation: Concrete

Influence of retarders on the hydration of clinker and cement
Information about the working mechanism of phosphonic acid (2-phosphonobutane 1,2,4-tricarboxylic acid, PBTC), tetrapotassium pyrophosphate and sucrose. [16 pages, 768 kB, PDF]
Publisher: Jörg Rickert
Registered on: Jul 4, 2005  |  Category: Materials Science: Admixtures for Concrete and Mortars

Mixture Proportioning for Internal Curing
The full text is, aside the linked abstract, available as PDF (7 pages, 1.5 B).
Publisher: Bentz, D. P.; Lura, P.; Roberts, J. W. in: Concrete International, Vol. 27, No. 2, 35-40, February 2005
Registered on: Jun 25, 2005  |  Category: Materials Science: Shrinkage-reducing Additives

Environmental and Health Provisions for Building Products (German)
Identification and evaluation of VOC emissions and odour exposure.
Publisher: Umweltbundesamt
Registered on: Apr 30, 2005  |  Category: Indoor air pollutants

Relating Fresh Concrete Viscosity Measurements from Different Rheometers
[6 pages, 520 kB, PDF]
Publisher: Chiara F. Ferraris and Nicos S. Martys, Journal of Research of the National Institute of Standards and Technology, Volume 108, Number 3, May-June 2003
Registered on: Mar 16, 2005  |  Category: Materials Testing: Rheology

Autogenous Deformation and Internal Curing of Concrete
Details on the mechanism of autogenous shrinkage. Measurements were made in cement pastes, normal weight concrete, and lightweight concrete. The effect of internal curing by addition of water-absorbing lightweight aggregates was tested. Full text is available (208 pages, 6.5 MB, PDF).
Publisher: Pietro Lura, Dissertation, 2003
Registered on: Mar 15, 2005  |  Category: Materials Science: Shrinkage-reducing Additives

The Rheology of Cementitious Materials
Working mechanism of superplasticizers which induce steric repulsion between cement particles (polycarboxylates) and their role in concrete rheology.
Publisher: Flatt, R. J.; Martys, N. S.; Bergstrom, L.; in: Materials Research Society (MRS Bulletin), Vol. 29, No. 5, 314-318, May 2004
Registered on: Mar 15, 2005  |  Category: Materials Science: Plasticizers for Concrete and Mortar

Mitigating Autogeneous Shrinkage by Internal Curing
Two different sources of internal water supply are compared: 1) replacement of a portion of the sand by saturated low-density fine aggregate and 2) the addition of superabsorbent polymer particles (SAP).
Publisher: Geiker, M. R.; Bentz, D. P.; Jensen, O. M.
Registered on: Mar 15, 2005  |  Category: Materials Science: Shrinkage-reducing Additives

Mitigation Strategies for Autogenous Shrinkage Cracking
The fundamental parameters contributing to the autogenous shrinkage and resultant early-age cracking of concrete are presented. Mitigation strategies which are discussed include: the addition of shrinkage-reducing admixtures more commonly used to control drying shrinkage, control of the cement particle size distribution, modification of the mineralogical composition of the cement, the addition of saturated lightweight fine aggregates, the use of controlled permeability formwork, and the addition of superabsorbent polymers ("water-entrained" concrete) .
Publisher: Bentz, D. P.; Jensen, O. M., in: Cement and Concrete Research, Vol. 26, No. 6, 677-685, August 2004
Registered on: Mar 15, 2005  |  Category: Materials Science: Shrinkage-reducing Additives

Silica Fume in Shotcrete
[6 pages, 720 kB, PDF]
Publisher: John Wolsiefer, Dudley R. Morgan, reprinted in: Shotcrete, Winter 2003 (originally published in Concrete International, April 1993)
Registered on: Mar 15, 2005  |  Category: Materials Science: Sprayed Concrete, Shotcrete, Gunite

GE Protimeter plc
Manufacturer of moisture meters and hygrometers.
Registered on: Mar 12, 2005  |  Category: Producers of Moisture Analysers

Bond Behaviour of a Multi-Filament Yarn Embedded in a Cementitious Matrix
In this study different innovative test methods are developed and used to identify the failure process of a strand as a result of the pull-out process and ascertain the contact faces between the individual filaments and the matrix. Full text available as PDF (153 pages, 4 MB).
Publisher: Björn Banholzer, Dissertation, 2004
Registered on: Mar 1, 2005  |  Category: Materials Science: Fibres as Admixture for Concrete and Mortar

Comparison of Concrete Rheometers: International Tests at MB (Cleveland, OH, USA) in May 2003
This report describes the round robin test and the results obtained.
Publisher: Ferraris, C. F.; Brower, L. E.; Beaupre, D.; Chapdelaine, F.; Domone, P.; Koehler, E.; Shen, L.; Sonebi, M.; Struble, L.; Tepke, D.; Wallevik, O.; Wallevik, J. E.; NISTIR 7154; 47 p. September 2004
Registered on: Jan 7, 2005  |  Category: Materials Science, Chemistry in Construction Technology

Method for the determination of the glyoxal content in cellulose ethers
[5 pages, 44 kB, PDF]
Publisher: Cefic - European Chemical Industry Council
Registered on: Nov 17, 2004  |  Category: Materials Science: Analysis and Synthesis on Additives for Concrete and Mortar

Tenax Fibers GmbH
Manufacturer of carbon fibres.
Registered on: Oct 19, 2004  |  Category: Suppliers of Raw Materials: Fibres

Prodexim Ltd.
Producer of fumed silica. Located in Ukraine.
Registered on: Oct 3, 2004  |  Category: Suppliers of Raw Materials: Thixotropic Agents (inorganic)

Relating Fresh Concrete Viscosity Measurements From Different Rheometers
Publisher: Ferraris, C. F.; Martys, N. S.; Journal of Research of the National Institute of Standards and Technology, Vol. 108, No. 3, 229-234, May/June 2003
Registered on: Oct 2, 2004  |  Category: Materials Testing: Rheology


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