Influence of Hydrophobic Agent on Rheological Behavior of Historical Plaster. Part 1: Initial Hardening Time

Abstract:

The influence of time on rheological properties of modified lime plaster is analyzed in this paper. Effect of composition of mixture is examined as well. Especially changes of paste due to hydrophobic and pozzolanic admixture. Main aim of rheological test is determination of flow curves, obtained by applying a succession of constant strain rates for short times. Base on performed experiments, it can be concluded that hydrophobic admixture eliminated influence of pozzolana. Also both time and temperature caused significant changes in rheological properties. Increasing values decreases the flow characteristic of the plaster. A comparative measurement with pure lime plaster was done as well.

• Periodical: Key Engineering Materials (Volume 776)
• Pages: 127-132
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.776.127
• Online since: August 2018
• Authors: Radka Pernicová*
• Keywords: Hydrophobic, Plaster, Rheology, Shear Stress, Temperature, Time

References

[1] Grzeszczyk, S., Front, K.: Effect of superplasticizers on the rheological properties of fly ash suspensions containing activators of the pozzolanic reaction. Cement and Concrete Research. 30 (2000) 1263-1266.

DOI: 10.1016/s0008-8846(00)00326-4

[2] Gołaszewski, J., Szwabowski, J.: Influence of superplasticizers on rheological behaviour of fresh cement mortars. Cement and Concrete Research. 34 (2004) 235-248.

DOI: 10.1016/j.cemconres.2003.07.002

[3] Nehdi, M., Rahman, M.: Estimating rheological properties of cement pastes using various rheological models for different test geometry, gap and surface friction. Cement and Concrete Research. 34 (2004) 1993-(2007).

DOI: 10.1016/j.cemconres.2004.02.020

[4] Yahia, A.: Effect of solid concentration and shear rate on shear-thickening response of high-performance cement suspensions. Construction and Building Materials. 53 (2014) 517-521.

DOI: 10.1016/j.conbuildmat.2013.10.078

[5] Lapasin, R., Papo, A., Rajgelj, S.: Flow behavior of fresh cement pastes. A comparison of different rheological instruments and techniques. Cement and Concrete Research. 13 (1983) 349-356.

DOI: 10.1016/0008-8846(83)90034-0

[6] Roussel, N.: Steady and transient flow behaviour of fresh cement pastes. Cement and Concrete Research. 35 (2005) 1656-1664.

DOI: 10.1016/j.cemconres.2004.08.001

[7] Baldino, N., Gabriele, D., Lupi, F., Seta, L., Zinno, R.: Rheological behaviour of fresh cement pastes: Influence of synthetic zeolites, limestone and silica fume. Cement and Concrete Research. 63 (2014) 38-45.

DOI: 10.1016/j.cemconres.2014.04.009

[8] Covas, J., Maia, J., Machado, A., Costa, P.: On-line rotational rheometry for extrusion and compounding operations. Journal of Non-Newtonian Fluid Mechanics. 148 (2008) 88-96.

DOI: 10.1016/j.jnnfm.2007.04.009

[9] Papo, A., Piani, L.: Effect of various superplasticizers on the rheological properties of Portland cement pastes. Cement and Concrete Research. 34 (2004) 2097-2101.

DOI: 10.1016/j.cemconres.2004.03.017

[10] Paiva, H., Silva, L., Labrincha, J., Ferreira, V.: Effects of a water-retaining agent on the rheological behaviour of a single-coat render mortar. Cement and Concrete Research. 36 (2006) 1257-1262.

DOI: 10.1016/j.cemconres.2006.02.018

[11] Gad, E.A.M., Mabrouk, M.R., Mosallamy F.H.: Rheological properties of different cement pastes made with different admixtures, Silicicate Industriels. 70 (2005) 59-64.

[12] Vikan, H., Justnes, H.: Rheology of cementitious paste with silica fume or limestone. Cement and Concrete Research. 37 (2007) 1512-1517.

DOI: 10.1016/j.cemconres.2007.08.012