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69:. The partial substitution of fly ash for Portland Cement is an important aspect of RCC dam construction because the heat generated by fly ash hydration is significantly less than the heat generated by Portland Cement hydration. This in turn reduces the thermal loads on the dam and reduces the potential for thermal cracking to occur. RCC is a mix of cement/fly ash, water, sand,
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In the quarter century following the construction of the Willow Creek Dam, considerable research and experimentation yielded many improvements in concrete mix designs, dam designs and construction methods for roller-compacted concrete dams. By 2008, about 350 RCC dams existed worldwide. As of 2018,
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at a further cost of $ 2 million, which initially reduced the leakage by nearly 75%; over the years, seepage has since decreased to less than 10% of its initial flow. Concern over the dam's long-term safety has continued however, although only indirectly related to its RCC construction. Within a few
161:
between
November 1981 and February 1983. Construction proceeded well, within a fast schedule and under budget (estimated $ 50 million, actual $ 35 million). On initial filling though, it was found that the leakage between the compacted layers within the dam body was unusually high. This condition
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For dam applications, RCC sections are built lift-by-lift in successive horizontal layers resulting in a downstream slope that resembles a concrete staircase. Once a layer is placed, it can immediately support the earth-moving equipment to place the next layer. After RCC is deposited on the lift
108:
near
Sondrio in North Italy between 1961 and 1964. Concrete was laid in a similar form and method but not rolled. RCC had been touted in engineering journals during the 1970s as a revolutionary material suitable for, among other things, dam construction. Initially and generally, RCC was used for
175:, and thus accelerate damage to the concrete. The controversy itself, as well as its handling, continued for some years. In 2004 an aeration plant was installed to address the root cause in the reservoir, as had been suggested 18 years earlier.
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placements. Roller-compacted concrete has many time and cost benefits over conventional mass concrete dams; these include higher rates of concrete placement, lower material costs and lower costs associated with post-cooling and
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years of construction, problems were noted with stratification of the reservoir water, caused by upstream pollution and anoxic decomposition, which produced
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that has essentially the same ingredients as conventional concrete but in different ratios, and increasingly with partial substitution of
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because the low cement content and use of fly ash cause less heat to be generated while curing than do conventional
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backfill, sub-base and concrete pavement construction, but increasingly it has been used to build concrete
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In dam construction, roller-compacted concrete began its initial development with the construction of the
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and common additives, but contains much less water. The produced mix is drier and essentially has no
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Brazilian
International Roller Compacted Concrete (RCC) Symposium, Salvador, Brazil, 7Sept. 2008
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Non-conventional
Concrete Dams on Rock Foundations: a critical review of patents and licences
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surface, small dozers typically spread it in one-foot-thick (about 30 cm) layers.
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38:, nearing completion in this photo, is the largest RCC dam in North America.
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412:"Ethiopia inaugurates tallest RCC dam in world built by Salini Impregilo"
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gas. Concerns were expressed that this could in turn give rise to
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224:"Roller-Compacted-Concrete Dams: Design and Construction Trends"
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Database of
Worldwide Roller Compacted Concrete Dams
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1028:International Federation for Structural Concrete
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377:US Army Corps of Engineers (June 18, 1997).
145:The first RCC dam built in the USA was the
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191:in Ethiopia, at 250 m, with the Pakistani
328:Larson, Douglas (January–February 2008).
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358:(start date conflicts with USACE source)
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77:. RCC is placed in a manner similar to
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27:Concrete blend used in dam construction
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399:RCC – New Developments and Innovations
205:List of roller-compacted concrete dams
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187:the highest dam of this type was the
591:Ground granulated blast-furnace slag
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162:was treated by traditional remedial
1008:Institution of Structural Engineers
313:, Taylor & Francis, 1997, p.111
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34:The rebuilt upper reservoir of the
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281:. PennWell Corporation. 2010-04-16
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25:
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1119:Concrete buildings and structures
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149:on Willow Creek, a tributary in
309:Iď¸ U︡riÄ Borisovich Mgalobelov,
299:Roller Compacted concrete (RCC)
81:; the material is delivered by
1129:Roller-compacted concrete dams
506:Roman architectural revolution
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243:Roller Compacted Concrete Dams
137:, RCC gravity dam, Oregon, USA
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195:under construction at 272 m.
157:. It was constructed by the
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1023:Portland Cement Association
998:American Concrete Institute
367:Portland Cement Association
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222:Abdo, Fares (2008-11-01).
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43:Roller-compacted concrete
18:Roller compacted concrete
245:. Taylor & Francis.
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159:Army Corps of Engineers
791:Alkali–silica reaction
549:Energetically modified
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93:or specially modified
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776:Environmental impact
634:Reversing drum mixer
241:Berga, Luis (2003).
444:History of Concrete
379:"Willow Creek Lake"
189:Gilgel Gibe III Dam
182:Gilgel Gibe III Dam
1124:Building materials
879:Self-consolidating
571:Water–cement ratio
421:. 17 December 2016
335:American Scientist
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89:, spread by small
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1093:Category:Concrete
874:Roller-compacting
695:Climbing formwork
544:Calcium aluminate
516:Roman engineering
348:10.1511/2008.69.6
252:978-90-5809-564-0
193:Diamer-Bhasha Dam
99:vibratory rollers
16:(Redirected from
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814:Fiber-reinforced
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928:Applications
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839:Nanoconcrete
725:Power trowel
710:Power screed
700:Slip forming
673:Construction
423:. Retrieved
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382:. Retrieved
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351:. Retrieved
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231:. Retrieved
228:Hydro Review
227:
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111:gravity dams
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945:hollow-core
904:Waste light
899:Translucent
859:Prestressed
786:Segregation
771:Degradation
659:Cover meter
596:Silica fume
531:Composition
83:dump trucks
1108:Categories
1044:Eurocode 2
982:Structures
869:Reinforced
829:Lunarcrete
809:AstroCrete
766:Durability
761:Properties
639:Slump test
611:Production
601:Metakaolin
425:15 January
384:2009-08-30
353:2009-08-30
285:2010-04-19
261:References
233:2017-04-16
91:bulldozers
1075:Hempcrete
1037:Standards
864:Ready-mix
781:Recycling
576:Aggregate
559:Rosendale
87:conveyors
71:aggregate
55:rollcrete
1114:Concrete
1068:See also
1059:EN 10080
1054:EN 206-1
1049:EN 197-1
908:Aerated
849:Polished
844:Pervious
819:Filigree
715:Finisher
690:Formwork
554:Portland
485:Concrete
342:(1): 6.
199:See also
164:grouting
120:formwork
59:concrete
1018:Nanocem
977:Columns
854:Polymer
754:Science
720:Grinder
680:Precast
586:Fly ash
493:History
153:of the
63:fly ash
940:waffle
889:Sulfur
745:Tremie
740:Sealer
705:Screed
649:Curing
539:Cement
249:
151:Oregon
79:paving
972:Roads
894:Tabby
801:Types
735:Float
664:Rebar
619:Plant
566:Water
75:slump
49:) or
935:Slab
917:RAAC
834:Mass
824:Foam
730:Pump
427:2020
247:ISBN
65:for
912:AAC
344:doi
85:or
47:RCC
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