Improving lime-based rendering mortars with admixtures

The present work presents focuses on the use of different admixtures for development rendering lime-based mortars with improved adhesion and durability, as well reduction cracking. To this aim, combinations an improver (ethylene–vinyl acetate copolymer, EVA), a water repellent agent (sodium oleate), viscosity enhancer (a starch derivative) mineral admixture (pozzolanic addition nanosilica or metakaolin) were tested. renders applied four substrates (sandstone, limestone, granite brick) to assess their performance. influence admixtures’ combination fluidity, stiffening time, adhesion, cracking, compressive strength, pore structure, frost resistance durability against magnesium sulfate attack was evaluated. EVA seen enhance when used in oleate, metakaolin starch. This also led minimized Opposite trends between cracking observed function porosity presence small-sized capillary pores. interferences carbonation accounted drops strength nanosilica-free tested renders; nanosilica-containing showed good performance, due filling effect C-S-H formation. most clearly renders, face freezing-thawing cycles attack, proving applicability these repair works Cultural Heritage new Civil Engineering applications.