空心玻璃微珠-玻璃纤维混凝土力学和声学性能的多目标优化

Multi-objective Optimization of Mechanical and Acoustic Properties of Hollow Glass Microsphere-Glass Fiber Concretes

摘要:

通过向混凝土复合掺入空心玻璃微珠和玻璃纤维，分析了空心玻璃微珠和玻璃纤维对混凝土力学性能及吸声性能的影响规律，揭示了混凝土孔结构的演变规律及其与吸声系数的相关性。结果表明：空心玻璃微珠虽能提升混凝土的吸声性能，但会降低其力学性能；掺入适量的玻璃纤维可改善混凝土的力学性能，优化孔结构特征，增加孔结构的复杂性并提高其分形维数，进而提高降噪性能；通过响应面预测，结合非支配排序遗传算法（NSGA-Ⅱ）和逼近理想解排序（TOPSIS），空心玻璃微珠体积替代率为10%、玻璃纤维掺量为0.2%的混凝土综合性能最优，其抗压强度为45 MPa，吸声系数为0.121。

Abstract:

By compounding hollow glass microspheres and glass fibers into concrete， the effect mechanical and sound absorption performance of the two additives on the concrete were investigated. The evolution law of the pore structure and its correlation with the sound absorption coefficients were revealed. The results indicate that hollow glass microspheres enhance the sound absorption performance of concrete， but reduce the mechanical strength. However， the addition of an appropriate amount of glass fibers can improve mechanical properties of concretes， optimize the pore structure characteristics， increase the complexity of the pore structure and fractal dimension， thereby enhancing the noise reduction performance. Using response surface methodology combined with the non-dominated sorting genetic algorithm （NSGA-Ⅱ） and the technique for order preference by similar to ideal solution （TOPSIS）， the comprehensive performance of concretes is optimal when the volume fraction of hollow glass microspheres is 10% and the content of glass fibers is 0.2%， with a compressive strength of 45 MPa and a sound absorption coefficient of 0.121.