BAUHAUS-UNIVERSITÄT WEIMAR | Dow GmbH & OHG | VDZ gGmbH

Interactions between cellulose ethers and cements with several main constituents in a model mix formulation for tile adhesives

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1 Water retention and consistency (flow table spread) of mortar in relation to the cement and the cellulose ether (addition level: 0.10 mass %)Z = Portland cement CEM I 52,5 R; Z35S = Portland slag cement (65 % Z, 35 % slag S); Z35V = Portland fly ash cement (65 % Z, 35 % fly ash V); Z55S = blast furnace cement (45 % Z, 55 % S); Z55V = pozzolanic cement (45 % Z, 55 % V) MC1 and MC2 unmodified MHEC: MC1-020SE: 80 % MC1 and 20 % starch ether; MC1-005P: 95 % MC1 and 5 % polyacrylamide
2 Univariant Tukey-Kramer analysis of the results of water retention (Figure 1)Z = Portland cement CEM I 52,5 R; Z35S = Portland slag cement (65 % Z, 35 % slag S); Z35V = Portland fly ash cement (65 % Z, 35 % fly ash V); Z55S = blast furnace cement (45 % Z, 55 % S); Z55V = pozzolanic cement (45 % Z, 55 % V) MC1 and MC2 unmodified MHEC; MC1-020SE: 80 % MC1 and 20 % starch ether; MC1-005P: 95 % MC1 and 5 % polyacrylamideWRV= water retention capacity
3 Ultrasound velocity in the mortar as a function of hydration time; horizontal line: 1000 m/s – for assessing the development of the microstructure and for quantifying the retarding action of the cellulose ethers (Figure 4)Z = Portland cement CEM I 52,5 R; Z35S = Portland slag cement (65 % Z, 35 % slag S); Z55S = blast furnace cement (45 % Z, 55 % S) MC1-005P: 95 % MC1 and 5 % polyacrylamide
4 Time taken to reach the ultrasound velocity of 1000 m/s as a function of the cement and the cellulose etherZ = Portland cement CEM I 52,5 R; Z35S = Portland slag cement (65 % Z, 35 % slag S); Z35V = Portland fly ash cement (65 % Z, 35 % fly ash V); Z55S = blastfurnace cement (45 % Z, 55 % S); Z55V = pozzolanic cement (45 % Z, 55 % V) MC1 and MC2 unmodified MHEC: MC1-020SE: 80 % MC1 and 20 % starch ether; MC1-005P: 95 % MC1 and 5 % polyacrylamide
5 Pore volume distribution in the mortar as a function of the cement (age: 56 d)
6 Pore volume distribution in the mortar as a function of the cement and of the cellulose ether (age: 56 d)Z = Portland cement CEM I 52,5 R; Z55S = blastfurnace cement (45 % Z, 55 % slag S); Z55V = pozzolanic cement (45 % Z, 55% fly ash V)MC1 = unmodified MHEC (DS: 1.76; MS: 0.18)
7 Porosity and compressive strength of mortar as a function of the cement with and without cellulose ethers (age: 56 d)Z = Portland cement CEM I 52,5 R; Z55S = blast furnace cement (45 % Z, 55 % slag S); Z55V = pozzolanic cement (45 % Z, 55% fly ash V)without CE = without added cellulose ether; with MC1 = with unmodified MHEC (DS: 1.76; MS: 0.18)
8 Univariant Tukey-Kramer analysis of the mortar compressive strength (Figure 7) Z = Portland cement CEM I 52,5 R; Z55S = blast furnace cement (45 % Z, 55 % slag S); Z55V = pozzolanic cement (45 % Z, 55% fly ash V)without CE = without added cellulose ether; with MC1 = with unmodified MHEC (DS: 1.76; MS: 0.18)
9 Compressive strength of mortar as a function of porosity (Figure 7)Z = Portland cement CEM I 52,5 R; Z55S = blast furnace cement (45 % Z, 55 % slag S); Z55V = pozzolanic cement (45 % Z, 55% fly ash V)MC1 = unmodified MHEC (DS: 1.76; MS: 0.18)

The interactions between (un)modified methyl hydroxyethyl celluloses and cements with several main constituents were determined using a model mix formulation for tile adhesives. The results show that these clinker-efficient cements with reduced specific CO2 emissions can also be used in complex mortar formulations and in this way increase the sustainability.

1 Introduction

Cements with further main constituents in addition to clinker have already been in use for a long time for concretes and also for plastering and masonry mortars because of their ecological, economic and technical advantages. However, formulations such as tile adhesives, which dominate in the field of premixed dry mortar, still primarily contain Portland cement. This is due to the lack of knowledge concerning the interactions between further cement main constituents additional to clinker and the admixtures that are required for such formulations. These admixtures are mainly water...

TEXT Dipl.-Ing Andreas Hecker1, Dr. rer. nat. René Kiesewetter2, M.Eng. Dipl.-Ing. (FH) Jens Herrmann3, Dr.-Ing. Jörg Rickert4, Prof. Dr.-Ing. Horst-Michael Ludwig5
1Scientific Assistant, Mortar Department, F.A. Finger Institute for Building Materials,
Bauhaus-Universität Weimar, Weimar/Germany
2Dow Produktions- und Vertriebs GmbH & OHG, Bomlitz/Germany
3Scientific Assistant, Cement Chemistry Department, VDZ gGmbH, Düsseldorf/Germany
4Head of Cement Chemistry Department, VDZ gGmbH, Düsseldorf/Germany
5Director of F.A. Finger Institute for Building Materials, Bauhaus-Universität Weimar, Weimar/Germany

This article appeared in

ZKG 9/2018

This article appeared in

ZKG 9/2018

Ressort:  Materials
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