What are the effects of micro-silica powder on the properties of cement paste and mortar

The addition of micro-silica powder can slow down the early hydration reaction rate of cement, reduce the hydration products, loosen the structure and reduce the early strength of cement mortar. Adding appropriate amount of silica fume can improve the hydration reaction speed of cement, increase hydration products, improve the compactness of cement mortar, promote the hydration reaction for a long time, and thus improve the late and long-term strength of cement mortar. The best content of silica fume is 8%. The addition of silica fume will reduce the fluidity of cement slurry and increase the setting time of cement, but the stability of cement is qualified.

Effect of pre-treated micro-silica powder on properties of cement slurry and mortar

In order to make full use of the excellent properties of silica fume, mechanical and chemical dispersion method was used to pretreat industrial silica powder at different pH values. The particle size and Zeta potential of silica powder dispersion were measured by Malvern nano laser particle size analyzer. The pre-treated silica fume is mixed into cement to form cement slurry and cement mortar samples. The properties of mortar specimens at room temperature, freeze-thaw cycle and high temperature were tested.

Gai Liu, Min Bai, Peng Zhao - Non-Metallic Mines

Quota:

Study on high performance cement-based repair materials and their interfacial properties

Effects of setting time, water requirement for normal consistency, and bonding properties (shear and tensile bonding, etc.). The interface agent of sulfoaluminate brine slurry was studied. The modification mechanism of cement mortar was studied by SEM and pore structure analysis. After the addition of silica fume and fine mineral powder, the impermeability of cement-based repair mortar is not improved, but decreased.

Meng - Jinan University

Citation: 5 Published in 2010:

Effects of carbon nanotubes on mechanical properties and 2D-3D microstructure of silica powder/cement mortar

To study the effects of carbon nanotubes on mechanical properties and 2D and 3D microstructure of silica powder/cement mortar. The 2D spatial morphology of mortar was measured by scanning electron microscopy (SEM), and the 3D defects of carbon nanotube reinforced silica fume/cement mortar system were characterized by X-ray computed tomography (CT) for the first time. At the same time, the fracture toughness and wear resistance of 28d mortar are discussed.

Liu Qiaoling, Sun Wei, Ma Zhengxian - Journal of Silicate

Citation: 2 Published 33362014

Effect of silica fume on properties of HPMC modified cement mortar

The effects of micro-silica powder on the workability, mechanical properties and pore structure of HPMC modified cement mortar were studied. The results show that when the content of silica fume is 2%, the fluidity and consistency of (1) are slightly improved compared with the control group. When the content of silica fume is 4%~10%, the fluidity and consistency of the newly mixed cement mortar show a decreasing trend, and when the content of silica fume is 10%, the fluidity and consistency are obvious.