Authors: Preston, RP; Pakula, AL; MacInnis, C

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Preston, RP, Pakula, AL & MacInnis, C 2023, 'Cold joints and hot pours in the arctic: design, implementation; and post construction investigation of a remotely placed Self Consolidating Concrete sill pillar', in B Abbasi, J Parshley, A Fourie & M Tibbett (eds), Mine Closure 2023: Proceedings of the 16th International Conference on Mine Closure, Australian Centre for Geomechanics, Perth.

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In 2018, approximately 17,000 m3 of Self-Consolidating Concrete (SCC) was placed into a historic mining stope approximately 120 m below surface as part of long-term stabilization efforts at the Giant Mine Remediation Project. Quality control and quality assurance materials testing as well as remote monitoring of the placement concluded that the SCC met design specifications and did not settle or experience undue thermal stress during placement. However, due to logistical issues during placement interrupting the planned continuous pour, the potential for cold joints within the monolithic pour were identified. In 2021, the artificial sill pillar was drilled and cored through four holes. UCS samples were collected; and the core was logged in support of updated modelling and assessment of the integrity of the pillar. This paper presents the results of this investigation and makes conclusions regarding the long-term performance of this monolithic, remotely constructed, sill pillar.

Google n.d., Giant Mine,
Pakula, A., Preston, R., Kennard, D., & MacInnis, C. (2019, September). Stabilising an underground void: monolithic construction using self-consolidating concrete. In Mine Closure 2019: Proceedings of the 13th International Conference on Mine Closure (pp. 263-274). Australian Centre for Geomechanics.
Preston, R & Roy, J 2017, ‘Use of unmanned aerial vehicles to supplement conventional investigation methods for underground open void stability and mitigation’, in Y Potvin & M Hudyma (eds), Proceedings of the First International Conference on Underground Mining Technology, Australian Centre for Geomechanics, Perth, pp. 609–616.
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