Experimental Study of Imbibition Characteristics of Silica Sol in Coal-Measure Mudstone Matrix

Abstract

Coal-measure mudstone is a typical dual-porosity media, and grouting in a matrix system is dominantly controlled by the imbibition effect for silica sol. This paper studies the imbibition effect using mudstone in the Huaibei mining area and silica sol as grouting material as an example. Groutability, driving force, and diffusion difficulty affecting the imbibition effect were tested by a mercury porosimeter, nanoparticle size analyzer, optical contact-angle measuring device, surface tension meter, and rotary viscosity meter. After finely grinding a mudstone sample, a pressureless imbibition process was conducted through nuclear magnetic resonance equipment for 216 h to study colloid spontaneous migration and phase characteristics. Results show that silica sol absorption rate follows a power function and that the spectrograms of T 2 are distributed in a triple peak pattern, with a tendency to move to the right of vertex time. The paper lays a theoretical and experimental foundation for field grouting in the coal mine.

Geochemical evidence for the application of nanoparticulate colloidal silica gel forin situcontainment of legacy nuclear wastes

“…In this study we utilized a commercially available colloidal silica (MasterRoc MP 325) 48 which consists of a pH 10, 0.14 M Na + (from Na2O) solution with 15 weight% dispersed silica nanoparticles (diameter: ~7.5 nm. ; Fig.…”

Long-Term Mechanical Behavior of Nano Silica Sol Grouting

“…When ionic sodium is added, the electric double layer becomes thinner and the silica particles connect to form a gel. Some of the physical and chemical parameters [ 2 , 17 ] of the silica sol and NaCl catalyst are listed in Table 1 . Gel time of silica sol to catalyst of 4:1, 7:1, and 9:1 (by volume) is 10 min, 2.67 h, and 9.33 h, respectively.…”

“…Nano silica sol is a kind of grouting material made up of nanometer particles that is highly transmissive [ 1 ]; it has been used in the geotechnical field in recent years [ 2 ]. Jurinak [ 3 ] developed a practical fluid-flow control system based on colloidal silica gel for oilfield reservoirs.…”

Stability of Deep Underground Openings through Large Fault Zones in Argillaceous Rock

“…The maximum frequency size of Marithan ® resin and catalyst ( d ) are 2.69 nm and 615.14 nm, respectively, while the particle sizes of the grout cumulative distribution curve corresponding to 95% (d ) for resin and catalyst are 3.62 nm and 824.99 nm, respectively. According to the groutability principle of fracture or porous mediums, the width of the fractures or pores the grout could be injected into is bigger than triple the grouting material particle size [41]. The particle sizes over triple the d and d on the cumulative distribution curve of Marithan ® resin are 8 nm (R × ) and 11 nm (R × ), respectively.…”