石灰石粉-矿渣-水泥(LS3)胶凝体系的水化动力学模型及力学性能预测OA

Utilizing slag and limestone powder as supplementary cementitious materials in cement-based composites has become increasingly widespread due to their low cost and low-carbon characteristics.When combined with cement,they exhibit synergistic reactions that enhance the mechanical properties of concrete.To establish an integrated hydration-strength optimization model for the limestone powder-slag-cement(LS3)ternary composite binder system,this study developed an integrated hydration-strength prediction model that couples chemical reactions,microstructural evolution,and macroscopic mechanical behavior to simulate the hydration process and calculate the reaction degrees of individual components.The Bernard-Ulm-Lemarchand model was employed to analyze the evolution of phase volume fractions during hydration.Combined with the degree of reaction,mixture proportions,and Powers'theory,the relationship between gel-space ratio and compressive strength was established.Response curves of concrete strength were then obtained through parametric analysis.The results indicate that limestone powder dominates early age(2 d to 7 d)strength development,whereas slag acts as the main driver for laterage(90 d to 360 d)strength growth.It is proposed that a limestone powder content of 8%to 12%and a slag content of 15%to 25%constitute the optimal range for balanced strength development across all ages in this system.The predicted compressive strengths show a correlation coefficient of 0.95 with experimental values and a root mean square error of 1.35 MPa.The model predictions agree well with independent test data.This study provides a theoretical model and computational basis for the precise design and engineering application of low-carbon cementitious materials.