Abstract
In the formulations of adhesive mortars for tiles almost exclusively CEM I Portland cements are used. Practically no CEM II - CEM V cements with additives are used, although they are often produced with strength classes 32.5 R and some even 42.5R. Relationship between strengths of tile adhesives in which cement was partially replaced with fly ash and granulated blast furnace slag was studied. A fly ash was used in three different replacement levels from 5% to 25% by weight of either cement. The tensile adhesion were determined at 28 and 90 days after various conditioning conditions of the samples. The influence on the flexibility of mortars was also assessed. In small substitution levels, fly ash replacement increased the tensile adhesion strength. The results indicate that the optimal amount of fly ash and granulated blast furnace slag additive replacing a given amount of cement allows to obtain adhesive mortars for tiles with high functional parameters.
Highlights
Cement-based adhesive mortars are designed to fix tiles or insulation materials to various surfaces, mainly concrete
The aim of the study was to conduct preliminary research, including an assessment of the possibility of use of granulated blast furnace slag and silica fly ash, as a basis for discussion on reducing the clinker content of cements used in powder adhesives
Selected physical properties of fly ash and slag are presented in Tables 3 and 4
Summary
Cement-based adhesive mortars are designed to fix tiles or insulation materials to various surfaces, mainly concrete. The use of mineral additives with proven latent hydraulic properties for blast furnace slag and for silica fly ash with pozzolanic properties, brings many benefits They are related to the modification of setting time as well as dynamics of strength development, porosity, shrinkage resistance and the resistance to chemical aggression of both fresh mixture and hardened mortar. Little research has been done on the use of such cements in cement-based powder adhesives Such adhesives have to meet a number of requirements for their strenth and performance such as fast strength gain over time, high adhesion and flexibility. The aim of the study was to conduct preliminary research, including an assessment of the possibility of use of granulated blast furnace slag and silica fly ash, as a basis for discussion on reducing the clinker content of cements used in powder adhesives
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