Analysis of mortar coating with different types and proportions of chemical admixtures that have water retentivity properties

Abstract

Water retaining agents are the main admixtures used to retain water against evaporation and substrate suction, and there are several chemical compounds for this purpose. To deepen the knowledge of mortar admixtures, several concentrations (0%, 1.5%, 5%, 10% and 15%) of three different types of admixtures were studied: an acrylic polymer, a cellulosic and ethylene vinyl acetate. Fresh properties (consistency, water retention, density and incorporated air), physical indexes (density and porosity) and compressive strength at 28 days were analyzed. It has been found that admixtures can act in different ways on mortars depending on the type of chemical agent used and can significantly affect the mechanical and durability characteristics in the fresh and hardened state. With this work it was verified the importance of searching references about the influence of chemical compounds before using it.

Proposal Mixes Process Method for Masonry Structure Laying Mortar

“…Mortars are used extensively throughout the world in applications such as wall and ceiling coatings, flooring, or grouting, and even for structural purposes, such as masonry and precast mortar grout (Santos, 2011;Barbosa et al, 2021;Castro et al, 2021;Schuab et al, 2021). In recent years, several companies have been replacing pre-prepared for precast mortars due to the difficulties in stocking and characterizing materials and inaccurate material proportions at the construction site (Barbosa, Santos, 2011;Haddad et al, 2020;Souza, Carvalhais, Santos, 2021). Furthermore, it is significant to consider the inaccuracies found in various current procedures, which can be very specific to regions or material types.…”

“…The mortar performance is subject to its roughness, which is set by the sand particle size (Sahmaran et al, 2009;Lange et al, 1997;Meng et al, 2012;Goble & Cohen, 1999;Peng & Ding, 2009); the final finishing (Faria et al, 2015;Sanchez, 2013); mechanical strength (related to materials) (Pan & Weng, 2012;Peng & Ding, 2009;Kadri & Duval, 2002;Sahmaran et al, 2009), efficient mix procedure forms (Silva, 2006;Allwood & Ashby, 2011;Haddad et al, 2020;Souza, Carvalhais, & Santos, 2021) and the water/cement factor (Motta & Oliveira, 2013;Souza, Carvalhais, & Santos, 2021). This research aims to develop an experimental mix procedure process for structural masonry laying mortar based on local requirements (workability and mechanical properties) and material characteristics.…”