Analysis of hydration, material properties, and pore structure of polymers enhanced with dendritic fibrous nanosilica as a concrete additive

Abstract

Different cement-based grouting and repair materials have been created and are commonly employed in construction renovation projects. Nevertheless, conventional cement mortars face challenges like limited corrosion resistance and weak bonding strength. Polymers, commonly used as modifiers for repair mortars, provide enhanced mechanical properties, increased resistance to corrosion, and better bonding. Despite these advantages, many polymer modifiers are inherently limited in preventing crack initiation and propagation, while also increasing costs. This study incorporated different amounts of three types of polymers supported on dendritic fibrous nanosilica (DFNS-polymers) into cement mortar to evaluate their effects on mortar performance, pore structure, and cement hydration. The addition of DFNS-polymers significantly improved the durability and workability of the mortar. Moreover, the pore structure was optimized, resulting in a more balanced pore distribution and a reduction in pore and porosity size. This research introduces an effective approach to enhancing the performance of repair mortars by combining polymers with suitable fillers.