is the process where a fluid cementitious grout is pumped under pressure to fill cracks. it is commonly used for grouting medium-to-fine sands where grouting is almost impossible for construction.Ultrafine Cement grout have better flow properties and bleed charcteristics.unfortunately the cost quantity is higher than usual methods due to great advantages of ultrafine cement grouts.
Cement is characterized as a microfine cement if the specific surface area is greater than 8000 cm2/g and the corresponding 95% finer (D95) particle diameter is smaller than 20 µm . In his context, the surface area of microfine cement (Ultrafin 12) is 22.000 cm2/g and 95 percent of its particles is finer than 12 µm. Moreover, it is purely Portland cement-based product. The particle size distribution of microfine cement was determined by particle sizing instrument. It uses the technique of laser diffraction to measure the size of particles. It does this by measuring the intensity of light scattered as a laser beam passes through a dispersed particulate sample. This data was then analyzed tocalculate the size of the particles which created the scattering pattern. The particle size distributions of Ultrafin 12 together with the same kind of other microfine cements.
MICROFINE CEMENT is a blast furnace slag-based ultrafine cement intended for specialty grouting applications. With a maximum particle size of ten microns and a median particle size of three microns, MICROFINE CEMENT is able to penetrate very small openings such as soil pores and microscopic rock fissures, in order to improve strength and reduce permeability.
Grout form depends on what kind of soils are present on working site for fracturing grouting are good for cohesive soils, Permeation are for sandy and gravel, while roofing are good for boundaries. the main purpose of this method is to Increase bearing strength, Prevent settlement, ensure air tightness,prevent heaving,seal water and to prevent seepage.