Ultrafine Cement




Grouting is a universal repair and strengthening technique, which is constantly used for structural remediation of concrete components, trenches, mine subsidence, dam joints, restoration of masonry structures and geological stabilizations. Having an extremely small particle size of only few microns, ultrafine cements are ideal for grouting applications due to their superior permeability and compressive strength properties of the hardened cement paste compared to that of the less-expensive, but coarser ordinary Portland cements.

Ultra-fine cements produced on the basis of Portland cement are much finer than ordinary cement and have a steep grading curve. It’s a cementitious grouting material that were initially developed as a replacement for unacceptably toxic chemical grouts for Civil Engineering applications. This cement mainly composed of ultrafine particles of slag and portland that exhibits excellent penetrability, strength and durability suitable for squeeze cementing of oilwell matrices, especially for gas (GOR) and water (WOR) control.

They are especially suited for rock and soil injection but nowadays also for filling and sealing of cracks in concrete.Several basic types are available: Ultrafine slag cement (Ml), Ultrafineportland cement (M3) and Ultrafine portland/slag (M5). M5 consists of a blend of ultrafine portland and slag cements. M1 is 100 percent ultrafine slag and M3 is 100 percent ultrafine portland. Because of its very slow hardening reaction, M1 cannot be used alone below 20 degree Celsius and must be used with at least 25 percent portland to initiate the hardening reaction. M1 may be used alone above 20 degree Celsius because higher oilwell temperatures initiate the slag hardening reaction especially with small amounts of sodium hydroxide.The ultrafine particle cement has 60 to 80% by volume of particles having a particle diameter of 1 to 5 μm in powder form of the cement.

It is used for pre- and post-excavation grouting, water cut-off grouting, dam grout curtain, soil consolidation and stabilization of structure foundation.

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Blog written by

Shruti Doshi
Technical Officer – Sanghi Cement & Blogger
shrutidoshi.1492@gmail.com

Blog Managed by

Nirav Pandya
Digital Marketing Officer – Sanghi Cement
nirav.pandya@sanghicement.com

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