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Abstract
The Nalubaale hydropower station was constructed between 1949 and 1954. Deterioration of the powerhouse structure was first noticed in 1964 when hairline cracking in the generator floor started to appear. The cracking progressively continued resulting in degradation of the generator floor, upper gallery and structural frame of the powerhouse. It was not until 1990 that alkali-silica reaction (ASR) in the mass concrete elements was identified to be the root cause of the deterioration. The condition of the powerhouse structure was reassessed in 2015 25 years after the investigations in 1990. The assessment comprised the determination of the concrete properties 50 years after ASR had initiated and a comprehensive evaluation of instrumentation data was undertaken to identify the effects of ASR on the powerhouse structure. This paper presents the findings of the condition assessment and provides an update on the concrete properties after more than 50 years of ongoing ASR. It also provides an assessment of the residual life of the structure and proposes rehabilitation methods to control the effects of ASR.
Highlights
The hydropower station, known as Nalubaale, is located near Jinja along the River Nile a few kilometres downstream of Lake Victoria and approximately 80km east of the Ugandan capital, Kampala
The dam has a maximum height of approximately 30m and a crest length of 726m whereas the intake structure, which is separated by high ground from the main dam, is 25m high with a crest length of 160m
Alkali-aggregate reaction has previously been distinguished into three types: alkali-silica reaction (ASR), alkali-carbonate reaction (ACR) and alkalisilicate reaction
Summary
The hydropower station, known as Nalubaale, is located near Jinja along the River Nile a few kilometres downstream of Lake Victoria and approximately 80km east of the Ugandan capital, Kampala. The power station complex comprises a concrete arch gravity dam, concrete gravity intake structure and the powerhouse. The powerhouse, 167.6m long and 16.5m wide, is monolithically joined to the intake structure at the base and houses 10 No turbines and generators with a total current capacity of 180 MW. The power station was constructed between 1949 and 1954 when the first two units were commissioned and the plant was known as Owen Falls. Until the 1990s the plant exported power to East Africa in addition to covering the national electricity demand. Nowadays the plant provides lowcost electricity counteracting the more expensive power provided by the recently commissioned hydropower stations
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