Preparation and Characterization of Polymer-Modified Sulphoaluminate-Cement-Based Materials

In situ polymerization of molecular monomers is a novel modification method for cement-based materials, effectively enhancing their properties. An orthogonal test method was employed to optimize the impact of polymers on sulfoaluminate-cement-based materials, incorporating range analysis and variance analysis to investigate the influences of the monomer, initiator, and crosslinker on the compressive strength and flexural strength. A comprehensive scoring method was utilized to determine the optimal polymer content. The modified cement-based materials were characterized through SEM, XRD, and FT-IR tests. The results demonstrated that the monomer significantly influenced the properties of modified cement-based materials. When the monomer content was 5%, the initiator content was 3%, and the crosslinking agent content was 2.5%, the mechanical properties of polymer-modified cement-based materials reached their peak. Characterization experiments revealed that in situ polymerization of molecular monomers led to more compact and compatible modified sulfoaluminate-cement-based material, with an improved organic–inorganic hybrid double network spatial structure that enhanced its structure and mechanical properties.