Long-Term Performance of Grout Containing Fly Ash and Brine


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Title: Long-Term Performance of Grout Containing Fly Ash and Brine

Author(s): A. A. Al-Manasser and M. D. Haug

Publication: Special Publication

Volume: 153


Appears on pages(s): 109-124

Keywords: age; durability; fly ash; grout; pressure; salt water; tests Materials Research

Date: 6/1/1995

Describes the performance of a cement-based grout recommended for possible use to control brine inflows in potash mines. The grout consists of Type III high-early-strength cement, fly ash, and sodium saturated brine. Specimens were prepared and submerged in containers filled with brine to cure under confining pressures of 0, 3.40, and 6.9 MPa (0, 500, and 1000 psi). The isotropic confining pressures were designed to simulate different mining environments and to accelerate penetration of brine into the specimens so that long term performance could be evaluated. Tests were conducted at different ages to determine the compressive strength, splitting tensile strength, and static and dynamic modulus of elasticity. The performance of grout mixtures containing brine with zero and 40 percent fly ash over the three-year test program seems to be in an acceptable range. Confining pressure can adversely affect the physical properties results of grout over time. This investigation found that a reduction in the physical properties was occurring after two years, especially when the grout was subjected to a confining pressure. The grout with fly ash exhibited a more scattered data under different confining pressures than grout with no fly ash; however, it showed a better long term performance. Generally, fly ash grouts stored under zero confining pressures were found to perform better than those subjected to high confining pressures.