Abstract
Ready mixed acrylic paste (RMAP) is a material used in exterior insulation systems of buildings; it consists of liquids and aggregates. However, it is considerably difficult to use an admixture to control the physical properties of the RMAP owing to problems associated with strength and workability. Thus, to improve the properties of RMAP, this study evaluates the properties of a mortar produced with RMAP as well as pozzolanic materials and atomizing slag, which is a by-product from the steelmaking industry. It was observed that if the density difference is large, a liquid RMAP may experience segregation. Through our experiments, we confirm that segregation resistance could be achieved even at 20% atomizing slag, which has a high density, by increasing the viscosity by approximately 1000 cP through the use of 10% fly ash and 3% metakaolin in the RMAP. Despite the increase in viscosity with the addition of the atomizing slag, the flow of the RMAP increased from 160 to 175 mm due to the spherical particle shape of the slag; in addition, the strength and water absorption coefficient also improved. In particular, the adhesion tension increased from 1.8 N/mm2 to 2.4 N/mm2 or higher.
Highlights
Among the various methods to improve energy efficiency of buildings, window and wall insulation systems with high airtightness and insulation are typically applied
E cement mortar that is used as an adhesive in exterior insulation systems can be largely divided into dry mortar, which is used by adding water at the construction site, and ready mixed acrylic paste (RMAP), which is cement mortar already mixed with aggregates, water, polymers, and additives [6,7,8]. e drawback of dry mortar is that the workability and strength of the obtained cement mortar vary considerably based on the amount of added water; in contrast, because RMAP already has the aggregates, water, and polymers mixed in, the workability can be predetermined, as the polymers are already dispersed in the cement mortar
After cement was added to the RMAP, they were mixed for 3 min. en, the mixture was left standing for 2 min and mixed again for 2 min after
Summary
Among the various methods to improve energy efficiency of buildings, window and wall insulation systems with high airtightness and insulation are typically applied. E cement mortar that is used as an adhesive in exterior insulation systems can be largely divided into dry mortar, which is used by adding water at the construction site, and ready mixed acrylic paste (RMAP), which is cement mortar already mixed with aggregates, water, polymers, and additives [6,7,8]. Admixtures are effective materials for dry shrinkage control, reduction of hydration heat, and improvement of packing density, among others; in particular, admixtures are divided into cement-based materials, which harden by directly reacting with water, and pozzolanic materials, which react with cement over time. If there is no or a small number of reactive cations in the liquid when pozzolanic materials are applied to the RMAP, the pozzolanic material might not react, staying unreacted till later; applying pozzolanic materials to the RMAP might be effective in improving the physical characteristics of structures
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