Facing systems for roller compacted concrete dams pdf

Rollercompacted concrete dams constructed primarily with rollercompacted concrete rcc. This document provides a guideline specification useful for developing project specifications for roller compacted concrete rcc as an exposed rcc pavement surface, that may or may not be diamond ground for smoothness andor texture. Update on air entrained grout enriched rcc research. Cancelroller compacted concrete rcc dams and concrete faced rockfill cfr dams. Rollercompacted concrete rcc, which takes its name from the construction method used to build it, is a concrete of zeroslump consistency in its unhardened state. This proportioning method involves establishing a relationship between the density and moisture content of an roller compacted concrete mixture to obtain the maximum density by compacting samples over a range of moisture. System formworks were used to form 65 m vertical wall of. Rollercompacted concrete pavements as exposed wearing surface version 1. Rcc can also be used in composite systems as base material. This report compares two different dam types roller compacted concrete dam. Roller compacted concrete transit mixing batching plant will use mixing truck instead of twinshaft mixer to produce the concrete, consist of aggregate hopper, belt conveyor, cement feeding and weighing system, control system, its very simple and portable.

Pdf construction of roller compacted concrete dam in. Pdf rollercompacted concrete dams rehabilitation in terms of. Roller compacted concrete defines as a kind of concrete which compacted by roller and the mixture of this kind of concrete has to tolerant compaction aci 207. Mar 31, 2015 ten largest roller compacted concrete dams 2. Bear creek dam va facing systems conventional concrete. The purpose of this manual is to provide information and guidance on the use of rollercompacted concrete rcc in dams and other civil works structures. What are the different types of facing systems used for rcc dams. This guide provides owneragencies, contractors, materials suppliers, and others with a thorough introduction to roller compacted concrete rcc and its many paving applications. The objective of this paper is to use the roller compacted concrete rcc for small dams design for the benefit it. Concrete dam engineering encyclopedia of life support systems. Roller compacted concrete rcc appeared as a feasible new type of construction material for concrete gravity dams. No slump is the specific property of the concrete of rcc dams. Tours will be arranged to longtan rcc gravity dam h216. Rcc overtopping protection for embankment dams was first applied in the early 1980s.

The soil compaction method is the most widely used mixture proportioning method for roller compacted concrete pavements. The strength of rcc is a function of wc ratio only for mixture with vebe time of 15 to 20 sec. Roller compacted concrete rcc dams and concretefaced rockfill cfr dams. Materials for embankment dams united states society on dams. This document was prepared for the portland cement association under. Cancelroller compacted concrete rcc dams and concretefaced rockfill cfr dams. The modified proctor compaction test uses 56,000 ftlb. Roller compacted concrete rcc has been rapidly developing over the past 40 years and is now commonly used for mass concreting operations typically in a gravity dam application.

Mixed concrete are spread with bulldozer for 3 or 4 thin layers, then they are compacted about 10 times by vibratory roller. The research questions that havegoverned this thesis are. Construction of roller compacted concrete dams in hot arid. The use of rcc in public and private applications has been increasing steadily in recent years fig.

The term roller compacted concrete rcc is used to describe a concrete used in the construction of dams and pavements, which combines the economical and rapid placement techniques used for fill dams with the strength and durability of concrete. Conventional concrete was used for the exposed downstream face and. Special specification 3258 roller compacted concrete. Concrete face rockfill dam compared to roller compacted. Rollercompacted concrete dams rehabilitation in terms of different. Rollercompacted concrete rcc is an economical, fast. The partial substitution of fly ash for portland cement is an important aspect of rcc dam construction because the heat generated by.

Rollercompacted concrete rcc started in the us and canada near 30 years ago, at that time it was a new method to construct gravity dams or rehabilitated. Rollercompacted concrete pavement rcc mixtures require compaction with the use of vibratory, tamper bar screeds, and typically but not always with either static or vibratory rollers to achieve a target density. Pages in category roller compacted concrete dams the following 111 pages are in this category, out of 111 total. Rollercompacted concrete rcc is a concrete of noslump consistency in its unhardened state that is typically transported, placed, and compacted using earth and rockfill construction equipment. To build the roller compacted concrete rcc cuchillo negro dam, pcl civil constructors inc. After passing these years, its become one of the popular methods in designing dams and called roller compacted concrete. Rollercompacted concrete rcc or rolled concrete rollcrete is a special blend of concrete that has essentially the same ingredients as conventional concrete but in different ratios, and increasingly with partial substitution of fly ash for portland cement. Roller compacted concrete rcc dams are attractive to many water and energy corporations around the world due to their ease in construction and low construction cost. Roller compacted concrete rcc is a concrete of noslump consistency in its unhardened state that is typically transported, placed, and compacted using earth and rockfill construction equipment. Rcc overtopping protection for embankment dams was. The paper provides an outline of important points that need to be recognized and understood when selecting material for use in embankment dams. Regardless of the projects size or importance, field quality control is necessary. Recent design and construction trends will be presented in the areas of mix designs, jointing, facing systems, and. Abdoing systems are being used on dams built today.

This manual provides guidelines for the design and construction of various types. Roller compacted concrete design and construction of water control structures. Rcc technology has been applied in dam construction for about 30 years. Rcc became very popular rapidly all over the world due to its low cost and fast deployment and is used for various purposes, including the construction of new dams, pavements, highways. Proceedings of the iv international symposium on roller compacted concrete dams. One of the fundamental principles usage of face drainage system appears at the. Design and construction considerations for hydraulic structures rollercompacted concrete second edition u. Rcc is a less than zeroslump concrete mixture that is placed and compacted with the same equipment used for asphalt paving. The ussd committee on materials for embankment dams has prepared this white paper on materials for embankment dams. The 1,500 feet of conveyors with a maximum belt capacity of almost 9 cubic yards per minute delivered the rcc mix to the jobsite without interruption or downtime. Since then, we have been involved as a lead designer or subconsultant on more than 30 rcc dam projects, totaling more than 2 million cubic yards. Concrete sika rcc dams handbook brochure pdf sika group. In terms of material types, concrete dams would include dressed masonry, rubble masonry, colcrete, plum concrete, cyclopean concrete, roller compacted concrete rcc and ordinary mass concrete of various aggregate sizes and strengths see chapter large dams.

Design and construction considerations for hydraulic structures. Rcc does not involve the use of internal vibration that typically is used to consolidate concrete used in conventional paving. In rollercompacted concrete dams the drainage gallery often increases construction time and increases costs because the earthfill method being used does not easily accommodate such a construction. A variety of upstream and downstream facing systems have been used on rcc dams. Castinplace concrete systems rcc and crcs rollercompacted concrete rcc has been widely used as overtopping protection for both embankment and concrete dams for a wide range of dam heights, flow depths, and velocities. Because the roller compacted concrete base allows for a reduction in the thickness of the conventional concrete pavement, multilayer systems can be used costeffectively in highway, airport, and. With a long history of good performance on heavy duty pavements concrete pavement, placed more efficiently no slump, low water content consistency of cement treated base placed by asphalt pavers compacted with vibratory rollers no forms no reinforcing steel no. The term rollercompacted concrete rcc describes the concrete used in the construction of dams, combining the costefective and rapid placing techniques that are used for earthill dams, with the strength and durability of concrete, and gets its name from the heavy rollers that are used to compact it into its inal form. However, the complex process of rcc dam construction is facing difficulties due to lack of understanding and.

Proceedings of the iv international symposium on roller compacted concrete dams, madrid, spain, 1719 november 2003 berga, luis on. Threedimensional earthquake analysis of rollercompacted. The purpose of this manual is to provide information and guidance on the use of roller compacted concrete rcc in dams and other civil works structures. The thickness of each lift for compaction of rcd concrete differs from that of rcc dam. Pdf construction of roller compacted concrete dam in malaysia.

Roller compacted concrete dam i examensarbetet kallat rccd och en. What are the differences in design of conventional concrete dams and roller compacted dams. This webinar will provide a general overview of the development of rcc and how this material is being used in dams and spillways. Gannett flemings first rcc design began four years later. Roller compacted concrete rcc in dam engineering came up in the early 1970s. In roller compacted concrete dams the drainage gallery often increases construction time and increases costs because the earthfill method being used does not easily accommodate such a construction. The hydration of cement and the climatic changes on the convective boundaries are the two main heat sources for the temperature rise in the roller compacted concrete dams. One possible method to decrease gallery construction time is to use precast concrete gallery segments, however this method has not yet been attempted.

Technical brief on rollercompacted concrete pavement. Gravity dams built using the rcc construction method, afford economies over conventional. Rollercompacted concrete dams rehabilitation in terms of. This thesis will bring all the basic knowledge needed about rcc and bring up critical parts for when designing adam. Pdf rollercompacted concrete rcc started in the us and canada near 30 years. Abdoing systems are being used on dams built today, including air. Design strength of rcc dam is often based on long term strength 90 days, 120 days or even 1 year. A book of broad interest to professionals, dam engineers and managers, and to organizations responsible for dam development and management, rcc dams offers a topical account of the design and operation of roller compacted concrete dams, describing the latest. Elements discussed include investigation and selection of materials, mixture proportioning, material properties, design and. Recent design and construction trends will be presented in the areas of mix designs, jointing, facing systems, and placement procedures.

Concrete face rockfill dam compared to roller compacted concrete dam a case study of dam constructions in panama. Rollercompacted concrete for dam safety modifications. Facings and contraction joints are important aspects to consider during the design of a rollercompactedconcrete dam. Formally called the khun dan prakan chon dam, it is 93 m tall and 2,720 m long. Roller compacting concrete has the ability such as either create new dams or repair old dams. Design and construction considerations for hydraulic. Mix design of roller compacted concrete the constructor. Although the type of facing system selected for a new dam is site specific and is based on a number of criteria, all successful facing systems for rcc dams have one feature in common they. Rollercompacted concrete rcc is used throughout the world for new dam construction. Importance of using roller compacted concrete in techno.

The worlds largest rollercompacted concrete dams 201503. It is defined as concrete compacted by roller, as per aci 207. Rcc will provide the final riding surface unless shown on the plans as base course where it will be covered with one or more lifts of asphalt concrete pavement. To build the rollercompactedconcrete rcc cuchillo negro dam, pcl civil constructors inc. The author who has been involved in the design and construction of more than 100 rcc dams in 35 countries shares his experience and recommendations for these critical elements. The portland cement association published a design manual for. Conveyor system speeds rcc dam construction concrete. Leader in rollercompacted concrete rcc technology the first rcc dam in the u. Upstream facing systems have consisted of conventional concrete, precast concrete with and without membrane backing, exterior geomembrane plating and grout enriched rcc. Thus, changing the rcc placement schedule according to. Roller compacted concrete rcc or rolled concrete rollcrete is a special blend of concrete that has essentially the same ingredients as conventional concrete but in different ratios, and increasingly with partial substitution of fly ash for portland cement. This specification references select articles and sections in items 360, 420, and 421 of the. Threedimensional earthquake analysis of rollercompacted concrete dams 2371 kf p ke f ke f r v bet f cfb e fdv e 3 where cf is the elasticity matrix consisting of diagonal terms in eq. Dams constructed of rcc are concrete gravity dams, and their stability requirement and methods of analysis is similar to gravity dams.