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A platform for research: civil engineering, architecture and urbanism
Preparation process of low-viscosity high-fluidity ultra-high performance concrete
The invention discloses a preparation process of low-viscosity high-fluidity ultra-high performance concrete, which comprises the following steps: (1) uniformly mixing Portland cement powder, sand fine aggregate, silica fume and fly ash, and spraying a polycarboxylate superplasticizer to obtain pretreated mixed powder; and (2) spraying an absolute ethyl alcohol solution containing a silane coupling agent into the pretreated mixed powder, and drying to obtain the modified mixed powder. And (3) placing the surface-galvanized steel fiber in saturated lime water containing sodium hydroxide and nano-silica, then carrying out a hydrothermal reaction, and separating out the fiber after the hydrothermal reaction is completed, so as to obtain a surface-treated fiber and an obtained liquid phase for later use. And (4) uniformly mixing the modified mixed powder and the surface treatment fiber, then adding the liquid phase, and uniformly mixing with clear water to obtain the ultra-high performance concrete. Under the condition of keeping a low water cement ratio, the viscosity of the ultra-high performance concrete slurry is reduced, the fluidity is improved, and the binding force between steel fibers and a concrete matrix is improved.
本发明公开一种低粘度高流动性超高性能混凝土的制备工艺，包括步骤：（1）将硅酸盐水泥粉、砂子细骨料、硅灰、粉煤灰混匀后喷洒聚羧酸减水剂，得预处理混合粉料。（2）向该预处理混合粉料中喷洒含有硅烷偶联剂的无水乙醇液，干燥后得到改性混合粉料。（3）将表面镀锌钢纤维置于含有氢氧化钠和纳米二氧化硅的饱和石灰水中，然后进行水热反应，完成后分离出纤维，得到表面处理纤维，得到的液相备用。（4）将所述改性混合粉料和表面处理纤维混合均匀，然后加入所述液相与清水混合后混合均匀，即得超高性能混凝土。本发明在保持低水灰比的情况下不仅降低了超高性能混凝土浆料的粘度，提高了流动性，而且改善了钢纤维与混凝土基体间的结合力。
Preparation process of low-viscosity high-fluidity ultra-high performance concrete
The invention discloses a preparation process of low-viscosity high-fluidity ultra-high performance concrete, which comprises the following steps: (1) uniformly mixing Portland cement powder, sand fine aggregate, silica fume and fly ash, and spraying a polycarboxylate superplasticizer to obtain pretreated mixed powder; and (2) spraying an absolute ethyl alcohol solution containing a silane coupling agent into the pretreated mixed powder, and drying to obtain the modified mixed powder. And (3) placing the surface-galvanized steel fiber in saturated lime water containing sodium hydroxide and nano-silica, then carrying out a hydrothermal reaction, and separating out the fiber after the hydrothermal reaction is completed, so as to obtain a surface-treated fiber and an obtained liquid phase for later use. And (4) uniformly mixing the modified mixed powder and the surface treatment fiber, then adding the liquid phase, and uniformly mixing with clear water to obtain the ultra-high performance concrete. Under the condition of keeping a low water cement ratio, the viscosity of the ultra-high performance concrete slurry is reduced, the fluidity is improved, and the binding force between steel fibers and a concrete matrix is improved.
本发明公开一种低粘度高流动性超高性能混凝土的制备工艺，包括步骤：（1）将硅酸盐水泥粉、砂子细骨料、硅灰、粉煤灰混匀后喷洒聚羧酸减水剂，得预处理混合粉料。（2）向该预处理混合粉料中喷洒含有硅烷偶联剂的无水乙醇液，干燥后得到改性混合粉料。（3）将表面镀锌钢纤维置于含有氢氧化钠和纳米二氧化硅的饱和石灰水中，然后进行水热反应，完成后分离出纤维，得到表面处理纤维，得到的液相备用。（4）将所述改性混合粉料和表面处理纤维混合均匀，然后加入所述液相与清水混合后混合均匀，即得超高性能混凝土。本发明在保持低水灰比的情况下不仅降低了超高性能混凝土浆料的粘度，提高了流动性，而且改善了钢纤维与混凝土基体间的结合力。
Preparation process of low-viscosity high-fluidity ultra-high performance concrete
一种低粘度高流动性超高性能混凝土的制备工艺
WANG MEINAN (author) / MA CHUNYU (author) / WANG LIANG (author) / ZHOU XIAOLONG (author) / LI YUJIAO (author)
2024-12-20
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
| European Patent Office | 2024
| European Patent Office | 2020
| European Patent Office | 2021
| European Patent Office | 2019