This study investigates the mechanical and durability properties of 12 ultra-high performance fiber reinforced concrete (UHPFRC) mixes manufactured using alternate aggregate sources. Natural gabbro aggregates (GA), steel slag aggregates (SSA), and recycled concrete aggregates (RCA) were employed as coarse aggregates. The volume of the coarse aggregate was limited to 12.5% of the total UHPC volume. Three types of steel fibers were employed: macro hooked-end fibers, micro straight fibers, and a hybrid combination of these two fibers. The fiber volume fractions tested were 0% and 1%. Properties investigated were compressive and flexural tensile strengths, electrical resistivity, porosity, and rapid chloride permeability. Test results revealed that the effect of aggregate type was more pronounced on the flexural strength than compressive strength. UHPFRC with steel micro-fibers or a hybrid combination of both steel macro and micro-fibers had a more noticeable effect on the compressive strength than that with steel macro-fibers, irrespective of aggregate type. Moreover, UHPFRC specimens with steel macro-fibers showed the highest flexural strength, regardless of the aggregate type. The SSA improved all durability properties of UHPFRC, whereas RCA noticeably deteriorated the resistivity and chloride permeability. The incorporation of steel micro-fibers improved the porosity and chloride permeability of all UHPFRC mixes.

本研究调查了使用替代骨料来源制造的 12 种超高性能纤维增强混凝土 (UHPFRC) 混合物的机械和耐久性特性。天然辉长岩骨料（GA）、钢渣骨料（SSA）和再生混凝土骨料（RCA）被用作粗骨料。粗骨料的体积限制在 UHPC 总体积的 12.5%。使用了三种类型的钢纤维：大钩端纤维、微直纤维和这两种纤维的混合组合。测试的纤维体积分数为0%和1%。研究的特性是压缩和弯曲拉伸强度、电阻率、孔隙率和快速氯化物渗透率。试验结果表明，骨料类型对抗弯强度的影响比抗压强度更显着。无论骨料类型如何，UHPFRC 与钢微纤维或钢粗纤维和微纤维的混合组合对压缩强度的影响比钢粗纤维更显着。此外，无论骨料类型如何，具有钢粗纤维的 UHPFRC 试样都显示出最高的弯曲强度。SSA 提高了 UHPFRC 的所有耐久性性能，而 RCA 显着降低了电阻率和氯化物渗透率。钢微纤维的加入提高了所有 UHPFRC 混合物的孔隙率和氯化物渗透率。无论骨料类型如何，具有钢粗纤维的 UHPFRC 试样都显示出最高的弯曲强度。SSA 提高了 UHPFRC 的所有耐久性性能，而 RCA 显着降低了电阻率和氯化物渗透率。钢微纤维的加入提高了所有 UHPFRC 混合物的孔隙率和氯化物渗透率。无论骨料类型如何，具有钢粗纤维的 UHPFRC 试样都显示出最高的弯曲强度。SSA 提高了 UHPFRC 的所有耐久性性能，而 RCA 显着降低了电阻率和氯化物渗透率。钢微纤维的加入提高了所有 UHPFRC 混合物的孔隙率和氯化物渗透率。