High Performance Concrete for Hydraulic Engineering Projects with Aggregates Presenting an AAR Hazard
Author(s): Falikman V. R.., Safarov K. B. and Stepanova V. F.
Paper category: Proceedings
Book title: Proceedings of International Conferences (ICACMS) Advances in Construction Materials and systems Vol 2
Editor(s): Manu Santhanam, Ravindra Gettu, Radhakrishna G. Pillai, Sunitha K. Nayar
Publisher: RILEM Publications SARL
Publication year: 2017
Total Pages: 10
Language : English
Abstract: Rogun Dam is an embankment dam in the preliminary stages of construction on the Vakhsh River in southern Tajikistan. Rogun was listed as the highest dam in the world. When constructed, it expected to produce 17.1 TWh of electrical power per year. Integrated studies of a wide range of local aggregates were conducted according to GOST 8269.0. It was established that crushed stone from local quarries all contained alkali-soluble silica in concentrations of much more than 50 mmol/l. The aggregates comprise sandstones, granite, limestones, amphibolite, shale, siltstone etc. Local sulphate resistant Portland cement is used for concrete mixes because groundwater in the construction area contains sulfates in high concentration (more than 34000 mg/l). The use of cement with mineral additives precludes development of hazardous damage to concrete with the above-specified aggregates. Additions of silica fume, metakaolin and siliceous fly ash as constituents of mortars and high-performance concrete were studied. The samples were tested for long-term alkali-silica reaction expansion (up to 20 months) in accordance with the GOST 8269.0 specification. It was showed that considerable increasing of concrete durability could be attained using active mineral additives and a polycarboxylate-based superplasticizer.
Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00
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