UHPC预制成型制备工艺及性能研究

通过对比浇筑成型制备工艺、直接喷涂成型制备工艺和预混喷涂成型制备工艺成型的UHPC力学性能发现，直接喷涂成型制备工艺抗弯强度、抗压强度、抗拉强度下降明显，不满足UHPC性能要求，而预混喷涂成型制备工艺抗弯强度、抗拉强度、抗压强度虽有所降低，但满足UHPC性能要求。通过分析各10组直接喷涂成型制备工艺和预混喷涂成型制备工艺成型UHPC力学性能发现，预混喷涂成型制备工艺力学性能稳定，可重复性较好，可用于UHPC产品预制成型。通过分析3种不同工艺成型UHPC试块断面图像发现，制备工艺不同程度地影响UHPC的孔隙率和纤维分布。

Study on prefabrication molding preparation process and properties of UHPC

Through comparing the mechanical properties of UHPC formed by cast molding preparation process, direct spray molding preparation process and premixed spray molding preparation process, it is found that the bending strength, compressive strength and tensile strength of the direct spray molding preparation process decrease significantly, which cannot meet the performance requirements of UHPC. The bending strength, tensile strength and compressive strength of the premixed spray molding preparation process also decrease, but meet the performance requirements of UHPC. Through the analysis of the mechanical properties of UHPC formed by direct and premixed spray molding preparation process, it is found that the mechanical properties of premixed spray molding preparation process are stable, with good repeatability, and can be used for the prefabrication of UHPC products. Through the cross-section image observation of UHPC test blocks formed by three different processes, it is found that the preparation process affects the porosity and fiber distribution of UHPC to varying degrees.