Potential of sodium sulfate solution for promoting the crack-healing performance for strain-hardening cementitious composites

摘要: Abstract Strain hardening cementitious composites (SHCCs) have been shown to promising self-healing ability. Nevertheless, reliable healing performance only occurs for micro-cracks in relatively young SHCCs and requires several months of moisture exposure. To overcome these criteria effective healing, this study explored the feasibility using sodium sulfate solution promote medium-term SHCCs. For purpose, cracks were induced SHCC specimens at age 180 days followed by a 28-day exposure high ion concentrations. Four mixtures with different ratios cement replaced pozzolans tested. In particular, containing an extremely volume granulated blast-furnace slag (GGBS) was studied. The behavior evaluated via multiple means, including uniaxial tensile tests, monitoring crack width, scanning electron microscopy, energy dispersive x-rays. results indicated that short-term effectively promoted cracked SHCCs, especially larger widths. It found newly formed precipitation within primarily consisted calcium carbonate, silicate hydrates, ettringite. addition, 71% replacement GGBS had highest recovery terms width response.