Response Surface Method for Strength Analysis and Proportion Optimization of New Type Sealing Materials

The influence of the interaction among water-cement ratio, content expansion agent, water reducing and retarder on compressive strength new sealing material was studied. Design-Expert software used to design experiments, establish a quadratic polynomial regression model, draw response surface, optimize parameters. microstructure morphology sample is explored by scanning electron microscope (hereinafter referred as SEM). research results show that between ratio agent most crucial factor affecting material. Under optimal condition 0.4% 0.04% retarder, 0.8 8% cured for 3 d 7 39.247 MPa 41.044 MPa, with maximum absolute error 1.71% 2.81%, which proves high accuracy model. main hydration products are ettringite C-S-H gel, interlacing each other form dense structure, contributes