Permeameter studies of water flow through cement and clay borehole seals in granite, basalt and tuff

Abstract

Portions of this document may be illegible in electronic image products. lmages are produced from the best available original document.

Sealing performance of bentonite and bentonite/crushed rock borehole plugs

“…This behavior is common to all six samples. Similar inflow-outflow behavior is observed in flow testing cement plugs emplaced in tuff and in granite cylinders (South and Daemen, 1986, Tables 4;12, 4.13).…”

Sealing of Boreholes and Underground Excavations in Rock

“…South and Daemen (1986) describe in detail the petrographical and mechanical properties of the rocks. Daemen (1991a, 1992a) describe the properties of Apache Leap tuff.…”

“…Dowell indicates that the slurry has density of 1.88 glcc, a strength of 26.2 MPa after 14 days of curing at 43°C, and 0.18% expansion after 14 days. Radial expansive stresses of the cement tested here have been measured by various investigators (South and Daemen, 1986;Fuenkajorn and Daemen, 1987;Akgun and Daemen, 1991c). They conclude that after 25 day of curing under water the radial expansive stress of cement can increase by up to 4 MPa.…”

“…They conclude that after 25 day of curing under water the radial expansive stress of cement can increase by up to 4 MPa. Measurements of the cement permeability by South and Daemen (1986) yield an estimate of 95 nanodarcy.…”

“…Brace, Walsh and Frangos, 1968;Cobb, 1981;South and Daemen, 1986). Drying the cement plugs increases their previously very low permeabilities by seven to nine orders of magnitude, depending on the drying period and temperature.…”