Paredes Julio A, Gálvez Jaime C, Enfedaque Alejandro, Alberti Marcos G
Departamento de Ingeniería Civil: Construcción, E.T.S de Ingenieros de Caminos, Canales y Puertos, Universidad Politécnica de Madrid, c/Profesor Aranguren, s/n, 28040 Madrid, Spain.
Materials (Basel). 2021 Nov 17;14(22):6944. doi: 10.3390/ma14226944.
This paper seeks to optimize the mechanical and durability properties of ultra-high performance concrete (UHPC). To meet this objective, concrete specimens were manufactured by using 1100 kg/m of binder, water/binder ratio 0.20, silica sand and last generation of superplasticizer. Silica fume, metakaolin and two types of nano silica were used for improving the performances of the concrete. Additional mixtures included 13 mm long OL steel fibers. Compressive strength, electrical resistivity, mercury intrusion porosimetry tests, and differential and thermogravimetric thermal analysis were carried out. The binary combination of nano silica and metakaolin, and the ternary combination of nano silica with metakaolin and silica fume, led to the best performances of the UHPC, both mechanical and durable performances.
本文旨在优化超高性能混凝土（UHPC）的力学性能和耐久性。为实现这一目标，采用1100 kg/m³的胶凝材料、水胶比0.20、硅砂和最新一代减水剂制作混凝土试件。硅灰、偏高岭土和两种纳米二氧化硅用于改善混凝土性能。额外的混合物包括13毫米长的OL钢纤维。进行了抗压强度、电阻率、压汞孔隙率测试以及差示和热重热分析。纳米二氧化硅与偏高岭土的二元组合以及纳米二氧化硅与偏高岭土和硅灰的三元组合，使UHPC在力学性能和耐久性方面均表现出最佳性能。
