The Influence of Hydrated Lime and Cellulose Ether Admixture on Water Retention, Rheology and Application Properties of Cement Plastering Mortars

Abstract

In this article, the effect of hydrated lime and cellulose ether on the water retention, rheology, and application properties of plasters was studied. For mortars, the consistency, bulk density, and water retention were tested. Rheological measurements of pastes included yield stress and plastic viscosity. In addition to standard tests of mortars and examining the rheological properties of the pastes, a proprietary method for testing the application properties was proposed. The obtained research results made it possible to evaluate the performance of the tested plasters. An attempt was also made to correlate the rheological properties of pastes (plastic viscosity) to the water retention value. The influence of hydrated lime and cellulose ether on selected properties of pastes and plasters was also presented using the statistical Box–Behnken method. The subjective rating of an expert plasterer confirmed the necessity of the modification of plastering mortars with hydrated lime and cellulose ether. As shown, modification of cement plastering mortar with hydrated lime and cellulose ether at the same time allows obtaining a material with favorable technical and technological properties, especially mortars applied by machine.

A New Laboratory Study on the Effect of Polyvinyl Alcohol and Cellulose Ether Dosages on the Fresh and Hardened State Properties of Sustainable Flyash Mortar

“…The production of these admixtures includes various steps like grinding, activation with NaOH aqueous solution, a heterogeneous reaction with an etherifying agent, neutralization, isolation of crude cellulose ether, puri cation, drying, and packaging (Strunk, 2012). These cellulose derivatives play a role in controlling water retention in fresh-state mortars, enhancing adhesion power (Spychał & Dachowski, 2021) (Patural et al, 2011), and in uencing rheological properties like viscosity and yield stress. Their primary purpose is to improve mortar workability (Cappellari, The use of either Polyvinyl Alcohol or cellulose ether for mortar fresh/hardened-state properties enhancement has garnered signi cant attention among researchers.…”

Modelling the Influence of Composition on the Properties of Lightweight Plaster Mortar and Multicriteria Optimisation

“…Admixtures are supplied as powders, the typically used low dosages being 0.3–1.5% of the weight of the cement. The researchers have established [ 11 , 12 , 13 , 14 ] that the introduction of additives improves workability and lowers the water demand of the mix, confers air entrainment, or adds waterproofing qualities. These changes have the potential to decrease cracking through improvements in the paste–aggregate bond and to increase the strength of hardened mortars.…”

“…As reported in the study [ 13 ], a material with beneficial technical and technological properties that are relevant for mortars administered by machine can be obtained due to the rheology of plastering mortars with hydrated lime and cellulose ether. The authors of [ 32 ] have shown that the presence of cellulose ethers in hydraulic lime-based mortars may decrease the density of mortars in a plastic state and improve their frost resistance due to higher open porosity.…”

“…However, “composition–property” functions were not obtained (or at least not shown). The paper [ 13 ] describes the study based on the three-factor, three-level Box–Bhenken design of the experiment. Neither the three-factor models with interaction effects nor the optimal contents of the three components are given.…”

Effects of selected retarders on workability window and other properties of cement-based sprayed mortars

“…In terms of rheology several approaches are known. Mineral admixtures such as clays and lime are used, or cellulose derivatives can be added [2][3][4][5]. A lightweight filler or aggregate (i. e. perlite, vermiculite etc.)…”