Mix proportion optimization of 3D printing wall materials based on response surface method
In order to obtain a mixture ratio of building 3D printing wall materials,and to meet the requirements of 3D printer which made by the laboratory,the original ratio was obtained through the preliminary tests,then the sulphoaluminate cement,silica fume and early strength agent were added to improve the material properties.The experimental scheme was designed by response surface method(RSM),then the regression model of 3 d compressive strength,3 d flexural strength and fluidity was established,the analysis of variance and image were carried out through the model.The optimal levels of each factor is obtained when the compressive strength,flexural strength and fluidity keep the optimal values:sulfoaluminate cement is 11.017%,silica fume is 11.795%and early strength agent is 0.4%.The verification test is carried out according to the optimal mix proportion given by the software,the results show that the 3 d compressive strength,3 d flexural strength and fluidity under this content are 13.726 MPa,2.907 MPa and 17.75 mm respectively,it is found that the relative error between the actual value and predicted value is small,which verifies the reliability of the response surface method in the mix proportion optimization of 3D printed wall materials.
response surface methodwall materials of 3D printingoptimal design
万方数据
