Naslov
An investigation into the use of blends of two bentonites for geosynthetic clay liners

Autori
Andrejkovičova, Slavka ; Rocha, Fernando ; Janotka, Ivan ; Komadel, Peter

Izvornik
Geotextiles and geomembranes (0266-1144) 26 (2008), 5; 436-445

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
geotechnical properties; water adsorption capacity; Enslin test; coeffi cient of permeability; X-ray diffraction; infrared spectroscopy

Sažetak
Enhancement of geotechnical parameters of Fe-rich bentonite of lower smectite content (L: Lieskovec, Slovakia ; 28– 56% montmorillonite) by addition of an Al-rich bentonite of higher smectite content (JP: Jelšovy´ potok, Slovakia ; 64% montmorillonite) is discussed. The blends of different L and JP contents (L:JP 85:15, 75:25, and 65:35 mass%) were investigated. Addition of more expensive Ca 2+ -JP to Ca 2+ -L bentonite caused increase in the geotechnical properties (liquid limit wL, plasticity limit wP, water adsorption by Enslin test ES) compared to raw Ca 2+ -L samples, but the parameters were still insuffi cient for sealing purposes of Ca 2+ -blends. After natrifi cation of the blends with soda ash, the geotechnical parameters markedly improved. Permeability coeffi cients of all the blends were satisfactorily low, of the order of 10E-11 msE-1. The liquid limit and water absorption values of the blend containing 65 mass% of Na+ -L and 35 mass% of Na+ -JP bentonites meets the requirements on geotechnical parameters of bentonites used in GCLs. Smectite content in the blends is the dominant factor affecting their properties.

Izvorni jezik
Engleski

Znanstvena područja
Rudarstvo, nafta i geološko inženjerstvo

POVEZANOST RADA