_REVISION - M1974052 ‎(13)‎

• Permit No: M1974052
• IBM Index Class Name: Revision
• Doc Name: JOINTLY SPONSORED RESEARCH PROPOSAL ASH BASED GROUT INJECTION FOR SUBSIDENCE CONTROL AT SHAMROCK MI
• Type & Sequence: TR1
• Media Type: D
• Archive: No

• Develops strengths in the range of 150 psi
• Low leachability of the cured material.
These design requirements are currently considered appropriate for the Shamrock Mine
but may be modified as a result of the Task 1 assessment.
Approximately four combinations of mine water and ash(es) will be assessed and tested.
Testing includes set times, strength development, and permeability and leachability by testing
described in Task H. The need for superplasticizers and other additives will be evaluated. The
incorporation of the bottom ash into the mixes as a means of limiting the dispersion of the grout
upon contact with the mine water will also be evaluated.
Task IV. Laboratory-Scale Mine Emulation Tests
A laboratory-scale mine emulator will be developed for the testing of the four grout mixes
developed in Task III. The emulator will be designed to simulate the conditions in the mine as the
grout is introduced and cured. The emulator needs to allow for the evaluation of the mine water
quality evaluations, as well as the geotechnical performance (setting, dispersion and strength
development).
It is anticipated that an emulator similar to that used by the North Dakota Public Service
Commission will be used for the study (Material Testing Services, 1995). The emulator in the
North Dakota study was an aquarium modified to simulate the mine conditions. The aquarium
was filled with mine water, and the grout mix pumped into the mine water. After the injection,
the lid to the aquarium was sealed and a vacuum pulled to lower the air/water interaction. The
water was circulated daily and samples of the water collected for analysis on a periodic basis. The
emulators were run for 90 days. At the completion of the tests, the grout was recovered and
tested for strength. The North Dakota Public Service Commission reported good correlation
between the results of the laboratory-scale emulator results and the field results.
Each of the four grout mixes will be tested in the modified mine emulator, and data on
water quality and geotechnical performance of each grout will be made. The information from
these tests, coupled with the results of the column leaching tests, should provide the information
needed to ascertain the interaction of both the fresh grout and the mine water, as well as the cured
grout and groundwater interaction.
Task V. Project Manasement and Reaortine
Dr. Alan E. Bland, who will serve as the project manager, will manage the project on a
day-to-day basis. Dr. Bland reports directly to Dr. Lee E. Brecher, WRI Vice President for
Engineering, who is responsible for overall technical and financial aspects of the project. WRI will
serve as the project administrator and as such will direct any subcontract portions of the work.
The status of the project and preliminary evaluations of the data from key testing series
will be provided in quarterly progress reports. An interim technical report will be written in
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