The microstructure of cement slurry is one of the important factors affecting its macro performance. Hydroxyethyl methyl cellulose used in cement, can play the effect of water retention and thickening. And affect the volume density, water absorption, impermeability, strength and other physical and mechanical properties of cement slurry. Which is inevitably the effect of hydroxyethyl methyl cellulose on the microstructure evolution of cement slurry.
The structure of cellulose ether cement slurry is relatively loose and contains more large holes. This once again shows that the cellulose ether can significantly affect the hole structure of the cement slurry body. And significantly increase the holes in the cement slurry body, especially to attract the more large holes in the cement slurry body.HEMC
Cellolose ether will introduce a large amount of gas into the cement slurry.
And significantly reduce the body strength of the cement slurry. But it will improve the unstressed water permeability, and significantly reduce the capillary water permeability. The effect of cellulose ether and reducing strength are consistent with the results of the analysis of pore structure and the obvious increase of holes above 50nm.HEMC
This is because the strength of the cement slurry mixed with cellulose ether is low. When the hole structure is teste by the mercury pressure method, the closed hole wall of the sample is destroye under great pressure. Allowing the mercury to enter the hole. It can also be conclude that although the cellulose ether can change the pore structure of the cement slurry. But its attractive hole is mainly the close hole.HEMC
Hydroxyethylcellulose can significantly reach the morphology and pore structure. Compared with pure cement slurry, C-S-H gel and calumite are produced relatively late in hydroxyethylmethyl cellulose. C-S-H gel is small and villous, and its size is short and thick. Hydroxyethylmethylcellulose also significantly increased the total pore volume and average pore diameter of the cement slurry. But reduce the pore ratio surface area, resulting in a significant increase in large pores, and the attractive holes are mainly close holes.HEMC