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Pasty high-dispersity silica fume-based concrete admixture and preparation method thereof
The invention discloses a pasty high-dispersity silica fume-based concrete admixture and a preparation method thereof. The pasty high-dispersity silica fume-based concrete admixture comprises solid powder, a self-made dispersing agent and water, wherein the solid powder comprises 70%-90% of modified silica fume and the balance fly ash microbeads. The method comprises the following steps: firstly, preparing 500mL of 35% calcium nitrate solution, and adding 500g of silica fume into the solution; stirring and ultrasonically dispersing for 25 minutes at normal temperature, and performing suction filtration and drying to obtain modified silica fume; and weighing the modified silica fume and the fly ash microspheres according to the ratio of the modified silica fume to the fly ash microspheres, and uniformly stirring. The admixture s only adsorbed on the surface of a solid mainly through the interaction of an ion bond, a covalent bond, a hydrogen bond, Van der Waals force and the like, wherein the other part is a solvated chain which is mainly used for improving the dispersion stability of the slurry. After the surface of the silica fume is modified, on one hand, the surface adsorbs a large amount of Ca 2+, so that the silica fume is more easily combined with a dispersant anchoring agent, and a solvated chain in the dispersant improves the stability of silica fume slurry.
本发明公开了一种浆状高分散性硅灰基混凝土掺合料及其制备方法，包括以下原料组件：固体粉料、自制分散剂和水，所述固体粉料包括改性硅灰70％‑90％，其余为粉煤灰微珠，首先配制500mL35％的硝酸钙溶液，在其中加入500g硅灰，在常温下搅拌并超声分散25min后，抽滤烘干，即得改性后硅灰，将改性后硅灰与粉煤灰微珠按改性硅灰、粉煤灰微珠比例称量后搅拌均匀，本申请主要通过离子健、共价键、氢键及范德华力等相互作用仅仅吸附在固体表面；另一部分为溶剂化链，其主要提高浆体分散稳定性。硅灰表面经过改性后，一方面表面吸附大量Ca2+，使其更容易与分散剂锚固剂结合，分散剂中溶剂化链提高硅灰浆体的稳定性。
Pasty high-dispersity silica fume-based concrete admixture and preparation method thereof
The invention discloses a pasty high-dispersity silica fume-based concrete admixture and a preparation method thereof. The pasty high-dispersity silica fume-based concrete admixture comprises solid powder, a self-made dispersing agent and water, wherein the solid powder comprises 70%-90% of modified silica fume and the balance fly ash microbeads. The method comprises the following steps: firstly, preparing 500mL of 35% calcium nitrate solution, and adding 500g of silica fume into the solution; stirring and ultrasonically dispersing for 25 minutes at normal temperature, and performing suction filtration and drying to obtain modified silica fume; and weighing the modified silica fume and the fly ash microspheres according to the ratio of the modified silica fume to the fly ash microspheres, and uniformly stirring. The admixture s only adsorbed on the surface of a solid mainly through the interaction of an ion bond, a covalent bond, a hydrogen bond, Van der Waals force and the like, wherein the other part is a solvated chain which is mainly used for improving the dispersion stability of the slurry. After the surface of the silica fume is modified, on one hand, the surface adsorbs a large amount of Ca 2+, so that the silica fume is more easily combined with a dispersant anchoring agent, and a solvated chain in the dispersant improves the stability of silica fume slurry.
本发明公开了一种浆状高分散性硅灰基混凝土掺合料及其制备方法，包括以下原料组件：固体粉料、自制分散剂和水，所述固体粉料包括改性硅灰70％‑90％，其余为粉煤灰微珠，首先配制500mL35％的硝酸钙溶液，在其中加入500g硅灰，在常温下搅拌并超声分散25min后，抽滤烘干，即得改性后硅灰，将改性后硅灰与粉煤灰微珠按改性硅灰、粉煤灰微珠比例称量后搅拌均匀，本申请主要通过离子健、共价键、氢键及范德华力等相互作用仅仅吸附在固体表面；另一部分为溶剂化链，其主要提高浆体分散稳定性。硅灰表面经过改性后，一方面表面吸附大量Ca2+，使其更容易与分散剂锚固剂结合，分散剂中溶剂化链提高硅灰浆体的稳定性。
Pasty high-dispersity silica fume-based concrete admixture and preparation method thereof
一种浆状高分散性硅灰基混凝土掺合料及其制备方法
LU GUOSEN (author) / MOU ZHONGJIANG (author)
2021-05-18
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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