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Pilot study of method for constructing concrete seals and fracture grouts in deep boreholes, and cementitious backfills in tunnels, drifts and shafts in crystalline rock: Theoretical modeling and experimental study
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Borehole sealing is required for different purposes, like permanent tightening of deep holesbored in conjunction with site investigations for location of radioactive waste repositories, andtemporary plugging of holes carrying water in deep mines. The holes will pass through low-permeablerock as well as through water-bearing fracture zones. Sealing can preferably bemade by use of concrete where such zones are intersected, while very low-permeable clayseals can be placed where the holes are surrounded by tight rock. This study focuses on withconcrete seals, and on grouts used for stabilizing intersected fracture zones before boreholesealing is started.The work on concrete comprised comparison of two recipes with different superplasticizers,i.e. organic Glenium which is currently used on a large scale, and talc being an inorganic,hydrophobic material. The study included determination of the compressive and tensilestrength as functions of time, and fluidity, pH and hydraulic conductivity of matured concrete.Part of the study concerned grouts for sealing of rock fractures. Two cement brands were usedas for the concrete study. The effect of adding palygorskite and talc to the silicious aggregatematerial for enhancing fluidity was tested. The work included determination of properties likestrength and fluidity.

Place, publisher, year, edition, pages
2012. , 80 p.
Keyword [en]
Technology, Borehole Sealing, Radioactive Waste, concrete, grouting, fracture grouts, crystalline rock, HLW disposal, oil-gas Reservoir, Co2 storage, Microstructural modeling, Glenium, Talc, Palygorskite, Petroleum industry, compression strength, Fluidity of concrete, Superpascizer, viscosity, cementitious
Keyword [sv]
URN: urn:nbn:se:ltu:diva-56725Local ID: d7ad81ed-899f-4e80-9557-844a06653c02OAI: diva2:1030112
Subject / course
Student thesis, at least 30 credits
Educational program
Civil Engineering, master's level
Validerat; 20120614 (anonymous)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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