First-exposure performance of the bentonite component of a GCL in a low-pH, calcium-enriched environment

Conference · Sat Nov 01 04:00:00 EST 1997

OSTI ID:543570

Quaranta, J D; Gabr, M A ^[1]; Bowders, J J ^[2]

---

1. West Virginia Univ., Morgantown, WV (United States). Dept. of Civil and Environmental Engineering
2. Univ. of Texas, Austin, TX (United States). Dept. of Civil Engineering

Testing was conducted on the bentonite portion of a Geosynthetic Clay Liner (GCL) for application to an environment characterized as having high concentrations of dissolved calcium ions. This environment presents conditions that might affect the long-term hydraulic function of the GCL as a component in a barrier system. Experiments were conducted to investigate first-exposure compatibility of a sodium bentonite GCL subject to the affects of acidic groundwater and second from the combined affects of acidic groundwater enriched with calcium. Relationships between the ionic exchange of sodium, potassium, magnesium and calcium species in the bentonite, and changes in hydraulic conductivity and electrical conductance are reported and discussed.

• OSTI ID: 543570
• Report Number(s): CONF-9601137--; ISBN 0-8031-2471-6
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
54 ENVIRONMENTAL SCIENCES
BENTONITE
CALCIUM COMPOUNDS
ELECTRIC CONDUCTIVITY
GROUND WATER
HYDRAULIC CONDUCTIVITY
ION EXCHANGE
LINERS
MATERIALS TESTING
PERFORMANCE
PH VALUE