Influence of Hydroxypropyl Guar on Water Retention of Cement Based Renders

Abstract

Cellulose ethers are polymers introduced into mortar formulations to improve thickening and water retention capacity. Cellulose industry require technology with chemicals treatment which causes the production of industrial wastewater and made this industry for one of the largest pollutants of water and air. This work present the analysis of possibile application of the guar beans powder in cement based renders for partical replacement of the cellulose ether. Technology of basic guar bean powder production is very simple process and present only mechanical operations which don't include a chemical treatments that causes pollutant effects to ecology. Experimental part involves a meassurement of water retention capacity in freshly mixed cement based render independency of quantity of aplicient hydroxypropyl guar. For measuring, filter plates and conical plastic rings according to EN 459-2 were used for measurements. The results are presented as mass percente of hydroxypropyl guar (HPG) which can be replaced with hydroxyethyl methyl cellulose (HEMC) including high water retention capacity in optimal conditions of used water for preparing fresh mixed mortars. Thereby, the possibility for decraseing consuption of cellulose used in building material products and constructions has been established which can improve a positive effect by decreasing wood exploatation and decreasing enviromental pollutants.