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http://hdl.handle.net/1942/18342Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.author | KNAPEN, Elke | - |
| dc.contributor.author | VAN GEMERT, Dionys | - |
| dc.date.accessioned | 2015-02-24T13:15:30Z | - |
| dc.date.available | 2015-02-24T13:15:30Z | - |
| dc.date.issued | 2015 | - |
| dc.identifier.citation | CEMENT & CONCRETE COMPOSITES, 58, p. 23-28 | - |
| dc.identifier.issn | 0958-9465 | - |
| dc.identifier.uri | http://hdl.handle.net/1942/18342 | - |
| dc.description.abstract | The modification of cement mortars with small amounts of water-soluble polymers (polyvinyl alcohol-acetate, methylcellulose and hydroxyethylcellulose) is studied. During hardening, two processes can take place, i.e. cement hydration and polymer film or bridge formation. Due to the very low polymer contents, the formation of polymer films is generally not considered. In this paper, evidence is given of the presence of polymer films or bridges in mortars modified with 1% of polyvinyl alcohol-acetate or methylcellulose. A contribution to the flexural strength of these mortars is found. By means of SEM investigation, polymer bridges are detected between the layered Ca(OH)2 crystals. Additional bonds are created which strengthen the preferential cleavage sites. Furthermore, polymer films or bridges are intergrown within the cement matrix on a submicron scale. | - |
| dc.description.sponsorship | The grant offered by the Institute for the Promotion of Innovation by Science and Technology in Flanders (IWT-Vlaanderen) is gratefully acknowledged. The Department of Metallurgy and Materials Engineering (MTM) and the Applied Geology & Mineralogy Research Group of K.U.Leuven are acknowledged for the use of the SEM and thermal analysis systems. | - |
| dc.language.iso | en | - |
| dc.rights | Copyright © 2015 Elsevier Ltd | - |
| dc.subject.other | polymer modification; film formation; microstructure; water-soluble polymers; SEM investigation; flexural strength | - |
| dc.title | Polymer film formation in cement mortars modified with water-soluble polymers | - |
| dc.type | Journal Contribution | - |
| dc.identifier.epage | 28 | - |
| dc.identifier.spage | 23 | - |
| dc.identifier.volume | 58 | - |
| local.bibliographicCitation.jcat | A1 | - |
| dc.description.notes | Knapen, E (reprint author), Hasselt Univ, Fac Architecture & Arts, Agoralaan Gebouw E, B-3590 Diepenbeek, Belgium. Elke.Knapen@uhasselt.be | - |
| dc.relation.references | [1] K. Khayat, Viscosity-enhancing admixtures for cement-based materials – an overview, Cem Concr Compos, 20 (2–3) (1998), pp. 171–188 [2] Ohama Y. Handbook of polymer-modified concrete and mortars. Noyes Publications; 1995. [3] H. Paiva, L. Silva, J. Labrincha, V. Ferreira, Effects of a water-retaining agent on the rheological behaviour of a single-coat render mortar, Cem Concr Res, 36 (7) (2006), pp. 1257–1262 [4] X. Fu, D. Chung, Effect of methylcellulose admixture on the mechanical properties of cement, Cem Concr Res, 26 (4) (1996), pp. 535–538 [5] Hayakawa K, Soshiroda T. Effects of cellulose ether on bond between matrix and aggregate in concrete. In: Sasse H, editor. Adhesion between polymers and concrete, Proceedings of international symposium organized by Rilem Technical Committee 52; 1986. p. 22–31. [6] J.H. Kim, R. Robertson, Effects of polyvinyl alcohol on aggregate-paste bond strength and the interfacial transition zone, Adv Cem Based Mater, 8 (2) (1998), pp. 66–76 [7] X. Fu, D. Chung, Effect of polymer admixtures to cement on the bond strength and electrical resistivity between steel fiber and cement, Cem Concr Res, 26 (2) (1996), pp. 189–194 [8] X. Fu, X. Fu, W. Lu, D. Chung, Improving the bond strength between carbon fiber and cement by fiber surface treatment and polymer addition to cement mix, Cem Concr Res, 26 (7) (1996), pp. 1007–1012 [9] Müller I. Influence of cellulose ethers on the kinetics of early Portland cement hydration. PhD thesis. Westfälische Wilhelms-Universität Münster; 2006. [10] Jenni A. Microstructural evolution and physical properties of polymer-modified mortars. PhD thesis. Philosophisch – Naturwissenschaftlichen Fakultät, Universität Bern; 2003. [11] E. Knapen, D. Van Gemert, Cement hydration and microstructure formation in the presence of water-soluble polymers, Cem Concr Res, 39 (1) (2009), pp. 6–13 [12] E. Knapen, O. Cizer, K. Van Balen, D. Van Gemert, Comparison of solvent exchange and vacuum drying techniques to remove free water from early age cement-based materials, J. Marchand, B. Bissonnette, R. Gagné, M. Jolin, F. Paradis (Eds.), Proceedings of the 2nd international RILEM symposium on advances in concrete through science and engineering, CD-rom, Quebec, Canada (2006) [13] European standard EN 196-1:2005: methods of testing cement – Part 1: Determination of strength. [14] Knapen E. Microstructure formation in cement mortars modified with water-soluble polymers. PhD thesis. K.U.Leuven; 2007. [15] Beeldens A. Influence of polymer modification on the behaviour of concrete under severe conditions. PhD thesis, K.U.Leuven; 2002. [16] A. Beeldens, D. Van Gemert, H. Schorn, Y. Ohama, L. Czarnecki, From microstructure to macrostructure: an integrated model of structure formation in polymer-modified concrete, Mater Struct, 38 (6) (2005), pp. 601–607 [17] A. Jenni, L. Holzer, R. Zurbriggen, M. Herwegh, Influence of polymers on microstructure and adhesive strength of cementitious tile adhesive mortars, Cem Concr Res, 35 (1) (2005), pp. 35–50 [18] M. Afridi, Y. Ohama, M. Iqbal, K. Demura, Morphology of Ca(OH)2 in polymer-modified mortars and effect of freezing an thawing action on its stability, Cem Concr Compos, 12 (3) (1990), pp. 163–173 [19] N.M. Bikales (Ed.), Encyclopedia of polymer science and technology, vol. 3John Wiley & Sons (1965) | - |
| local.type.refereed | Refereed | - |
| local.type.specified | Article | - |
| dc.identifier.doi | 10.1016/j.cemconcomp.2014.11.015 | - |
| dc.identifier.isi | 000351971200003 | - |
| item.validation | ecoom 2016 | - |
| item.accessRights | Restricted Access | - |
| item.fullcitation | KNAPEN, Elke & VAN GEMERT, Dionys (2015) Polymer film formation in cement mortars modified with water-soluble polymers. In: CEMENT & CONCRETE COMPOSITES, 58, p. 23-28. | - |
| item.fulltext | With Fulltext | - |
| item.contributor | KNAPEN, Elke | - |
| item.contributor | VAN GEMERT, Dionys | - |
| crisitem.journal.issn | 0958-9465 | - |
| crisitem.journal.eissn | 1873-393X | - |
| Appears in Collections: | Research publications | |
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| File | Description | Size | Format | |
|---|---|---|---|---|
| CCC_Polymer film formation in cement mortars modified with water-soluble polymers.pdf Restricted Access | Published version | 2.5 MB | Adobe PDF | View/Open Request a copy |
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