Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
The invention relates to a preparation method of a modified silica fume material, which belongs to the technical field of building materials, and comprises the following steps: adding silica fume into absolute ethyl alcohol, and uniformly dispersing to obtain silica fume dispersion liquid; and adding a silane coupling agent into deionized water, adding the prepared silane coupling agent hydrolysate into the silica fume dispersion liquid, placing in a water bath at 60-80 DEG C, magnetically stirring, filtering after completion, cleaning filter residues with deionized water, and finally performing vacuum drying and grinding to obtain the modified silica fume material. The silane coupling agent is adopted to modify the silica fume, amino silane reacts with silicon hydroxyl on the silica fume, the Zeta potential on the surface of the silica fume changes, negative charges are changed into positive charges, the steric hindrance among silica fume particles is increased, the number of large particles of the modified silica fume is reduced, and particle size distribution is more concentrated; and after the modified silica fume is doped into the fly ash cement, the fluidity of fly ash cement neat paste is improved, the dispersity of the modified silica fume is improved, and the early strength of the fly ash cement is improved.
本发明涉及一种改性硅灰材料的制备方法，属于建筑材料技术领域，首先将硅灰加入到无水乙醇中，分散均匀得硅灰分散液；接着将硅烷偶联剂加入到去离子水中，将制得的硅烷偶联剂水解液加入到硅灰分散液中，置于60～80℃的水浴中并磁力搅拌，结束后过滤并用去离子水清洗滤渣，最后真空干燥，研磨得到改性硅灰材料。本发明采用硅烷偶联剂对硅灰进行改性，氨基硅烷与硅灰上的硅羟基发生反应，硅灰表面的Zeta电位发生变化，由负电荷变成了正电荷，硅灰颗粒之间的空间位阻增大，改性硅灰的大颗粒数量减少，粒度分布更加集中，将改性硅灰掺入粉煤灰水泥后，粉煤灰水泥净浆流动度提高，改性硅灰分散性得到改善，并且增加了粉煤灰水泥前期的强度。
The invention relates to a preparation method of a modified silica fume material, which belongs to the technical field of building materials, and comprises the following steps: adding silica fume into absolute ethyl alcohol, and uniformly dispersing to obtain silica fume dispersion liquid; and adding a silane coupling agent into deionized water, adding the prepared silane coupling agent hydrolysate into the silica fume dispersion liquid, placing in a water bath at 60-80 DEG C, magnetically stirring, filtering after completion, cleaning filter residues with deionized water, and finally performing vacuum drying and grinding to obtain the modified silica fume material. The silane coupling agent is adopted to modify the silica fume, amino silane reacts with silicon hydroxyl on the silica fume, the Zeta potential on the surface of the silica fume changes, negative charges are changed into positive charges, the steric hindrance among silica fume particles is increased, the number of large particles of the modified silica fume is reduced, and particle size distribution is more concentrated; and after the modified silica fume is doped into the fly ash cement, the fluidity of fly ash cement neat paste is improved, the dispersity of the modified silica fume is improved, and the early strength of the fly ash cement is improved.
本发明涉及一种改性硅灰材料的制备方法，属于建筑材料技术领域，首先将硅灰加入到无水乙醇中，分散均匀得硅灰分散液；接着将硅烷偶联剂加入到去离子水中，将制得的硅烷偶联剂水解液加入到硅灰分散液中，置于60～80℃的水浴中并磁力搅拌，结束后过滤并用去离子水清洗滤渣，最后真空干燥，研磨得到改性硅灰材料。本发明采用硅烷偶联剂对硅灰进行改性，氨基硅烷与硅灰上的硅羟基发生反应，硅灰表面的Zeta电位发生变化，由负电荷变成了正电荷，硅灰颗粒之间的空间位阻增大，改性硅灰的大颗粒数量减少，粒度分布更加集中，将改性硅灰掺入粉煤灰水泥后，粉煤灰水泥净浆流动度提高，改性硅灰分散性得到改善，并且增加了粉煤灰水泥前期的强度。
Preparation method and application of modified silica fume material
一种改性硅灰材料的制备方法及其应用
11.06.2021
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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