Talc-based concrete for sealing borehole optimized by using particle packing theory
2013 (English)In: Journal of Civil Engineering and Architecture, ISSN 1934-7359, E-ISSN 1934-7367, Vol. 7, no 4, 440-455 p.Article in journal (Refereed) Published
The paper describes assessment of the performance of cement-poor concreteson the basis of packing theory. The concretes are intended for sealing segments of deep boreholes and have a small amount of cement for minimizing the mutual chemical impact on the contacting clay seals. The composition is examined by application of packing theory with respect to the cement/aggregate ratio and the gradation of the aggregate material which is crushed quartzite for providing high internal friction after maturation, as well as to talc added for fluidity and to the small amount of cement. Low porosity and micro-structural stability must be guaranteed for very long periods of time. The study exemplifies how packing theory assist designers in selecting optimal proportions of the various components. Optimum particle packing implies minimizing the porosity and thereby reducing the amount of cement paste needed to fill the voids between the aggregate particles. The use of talc as inorganic super-plasticizer since ordinary organic additives for reaching high fluidity at casting are undesirable, and since talc reacts with cement and provides high strength in along-term perspective.
Place, publisher, year, edition, pages
2013. Vol. 7, no 4, 440-455 p.
Research subject Soil Mechanics; Structural Engineering
IdentifiersURN: urn:nbn:se:ltu:diva-5464Local ID: 39122806-2ee8-4374-a995-905afc43f02cOAI: oai:DiVA.org:ltu-5464DiVA: diva2:978338
Validerad; 2013; 20130129 (nadhir)2016-09-292016-09-29Bibliographically approved