Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Preparation method of super-retarded concrete
The invention provides a preparation method of super-retarded concrete. Adding the coarse aggregate and the fine aggregate into a stirrer, and stirring for 30 seconds; adding Portland cement and fly ash, and stirring for 30s; adding water, a polycarboxylic acid water reducing agent and a glue reducing agent, stirring for 60 seconds, and standing for 1 hour; and adding the reinforcing-retarding particles, and stirring for 60 seconds to obtain the super-retarding concrete. The reinforcing-retarding particles are adopted, so that the retarding effect on the concrete is achieved, and meanwhile, the effect of enhancing the mechanical property of the concrete is also achieved. The reinforcing-retarding particles are formed by grafting pyrophyllite with a super absorbent material, the super absorbent material has a large number of hydroxyl groups and carboxyl groups, and the carboxyl groups react with free Ca < 2 + > in an alkaline environment of hydration of Portland cement to generate an unstable complex, so that the concentration of Ca < 2 + > in a liquid phase is reduced, the hydroxyl groups are easy to combine with water molecules, and the water molecules in the liquid phase are easily separated. A stable solvated water film is formed on Portland cement particles through hydrogen bond interaction, cement hydration is hindered, and therefore the retarding effect is achieved.
本发明提供了一种超缓凝混凝土的制备方法。将粗骨料和细骨料加入搅拌机中搅拌30s；加入硅酸盐水泥和粉煤灰搅拌30s；加入水、聚羧酸减水剂和减胶剂，搅拌60s后静置1h；加入增强‑缓凝颗粒，搅拌60s，即得超缓凝混凝土。本发明采用增强‑缓凝颗粒，对于混凝土不仅具有缓凝的效果，同时还具有增强混凝土力学性能的效果。增强‑缓凝颗粒为叶腊石接枝了高吸水材料，高吸水材料上具有大量的羟基和羧基，羧基在硅酸盐水泥水化的碱性环境中与游离Ca2+发生反应，生成不稳定的络合物，致使液相中Ca2+浓度降低，而羟基易与水分子结合，通过氢键作用在硅酸盐水泥颗粒形成稳定的溶剂化水膜，阻碍了水泥水化，从而起到缓凝作用。
Preparation method of super-retarded concrete
The invention provides a preparation method of super-retarded concrete. Adding the coarse aggregate and the fine aggregate into a stirrer, and stirring for 30 seconds; adding Portland cement and fly ash, and stirring for 30s; adding water, a polycarboxylic acid water reducing agent and a glue reducing agent, stirring for 60 seconds, and standing for 1 hour; and adding the reinforcing-retarding particles, and stirring for 60 seconds to obtain the super-retarding concrete. The reinforcing-retarding particles are adopted, so that the retarding effect on the concrete is achieved, and meanwhile, the effect of enhancing the mechanical property of the concrete is also achieved. The reinforcing-retarding particles are formed by grafting pyrophyllite with a super absorbent material, the super absorbent material has a large number of hydroxyl groups and carboxyl groups, and the carboxyl groups react with free Ca < 2 + > in an alkaline environment of hydration of Portland cement to generate an unstable complex, so that the concentration of Ca < 2 + > in a liquid phase is reduced, the hydroxyl groups are easy to combine with water molecules, and the water molecules in the liquid phase are easily separated. A stable solvated water film is formed on Portland cement particles through hydrogen bond interaction, cement hydration is hindered, and therefore the retarding effect is achieved.
本发明提供了一种超缓凝混凝土的制备方法。将粗骨料和细骨料加入搅拌机中搅拌30s；加入硅酸盐水泥和粉煤灰搅拌30s；加入水、聚羧酸减水剂和减胶剂，搅拌60s后静置1h；加入增强‑缓凝颗粒，搅拌60s，即得超缓凝混凝土。本发明采用增强‑缓凝颗粒，对于混凝土不仅具有缓凝的效果，同时还具有增强混凝土力学性能的效果。增强‑缓凝颗粒为叶腊石接枝了高吸水材料，高吸水材料上具有大量的羟基和羧基，羧基在硅酸盐水泥水化的碱性环境中与游离Ca2+发生反应，生成不稳定的络合物，致使液相中Ca2+浓度降低，而羟基易与水分子结合，通过氢键作用在硅酸盐水泥颗粒形成稳定的溶剂化水膜，阻碍了水泥水化，从而起到缓凝作用。
Preparation method of super-retarded concrete
一种超缓凝混凝土的制备方法
LI XIAOTING (Autor:in) / CHEN WENXUAN (Autor:in) / TANG YUNDAN (Autor:in) / YOU BAI (Autor:in) / LYU CHAOYANG (Autor:in) / MENG HUICHENG (Autor:in) / YUAN TING (Autor:in) / SHEN LEI (Autor:in)
05.04.2024
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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