Filtration and penetrability of cement-based grout: Study performed with a short slot

• Published in: Tunnelling and underground space technology Vol. 26; no. 4; pp. 548 - 559
• Main Authors: Draganović, Almir, Stille, Håkan
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-07-2011; Elsevier
• Subjects: Applied sciences; Buildings. Public works; Cements; Concretes. Mortars. Grouts; Exact sciences and technology; Filtration; Flocculating; Fracture mechanics; Grout; Grouts; Materials; Measurements; Penetrability; Penetration; Rock; Short slot; Vulnerability; Penetrability; Short slot; Filtration; Measurements; Grout; Performance evaluation; Material composition; Construction materials; Measurement result; Penetration test; Particle fineness; Experimental study; Cement
• ISSN: 0886-7798; 1878-4364; 1878-4364
• DOI: 10.1016/j.tust.2011.02.007

► Penetration and filtration of cement-based grout has been studied with a short slot. ► Grouts based on cements with a d
95 of 32
μm had the best penetrability. ► A high w/c ratio and high pressure improve penetrability.
Filtration of cement-based grout during penetration through fractures in rock is an important issue while sealing the rock around tunnels. Whether a type of grout could be designed to penetrate a fracture of a certain aperture without filtration is an interesting question that needs to be further investigated. This study examines the question of whether grout penetration can be measured using our designed measuring method as well as which factors and processes influence the penetrability and filtration of the grout.
The penetration and filtration of grout are complex processes influenced by many factors such as the grain-size curve of the cement, hydration and flocculation, pressure, grain concentration, and the geometry of constriction.
The measured results were in agreement with the predicted results, indicating that the filtration process in the given geometry describes correctly.