Foreword
Since its development in the 1980s, Roller Compacted Concrete (RCC) has been used on a frequent basis to rehabilitate dams of various types and with a wide range of deficiencies. Numerous documents have been written on the subjects of engineering analysis and design for RCC projects, but there is not a document specific to RCC construction. This document emphasizes the practical aspects of the physical construction using this relatively new construction technology and covers a broad spectrum of issues that must be addressed to implement a dam rehabilitation project using RCC.
This document was prepared by the USSD Committee on Construction and Rehabilitation, Subcommittee on RCC. The Subcommittee included the following members, all of whom contributed to this document:
| James R. Obermeyer, Subcommittee Chair | Kenneth D. Hansen |
| Daniel L. Johnson, Assistant Chair | Steven R. Jacoby |
| Randall P. Bass | William A. Moler |
| Timothy P. Dolen | Paul Schweiger |
| James Goris | |
It is the intent and hope of the Subcommittee that this document will provide valuable information and guidance to contractors, engineers and owners involved in the use of RCC for dam rehabilitation.
Table of Contents
CHAPTER 1 - INTRODUCTION
1.1 GENERAL
1.2 WHY RCC TO REHABILITATE DAMS?
1.3 HISTORY OF DAM REHABILITATION USING RCC
1.3.1 General
1.3.2 RCC for Dam Overtopping Protection
1.3.3 RCC for Dam Stability Improvements
1.3.4 RCC for Other Dam Deficiencies
CHAPTER 2 - MEANS, METHODS AND PROCEDURES FOR RCC CONSTRUCTION
2.1 GENERAL
2.2 DIVERSION AND CARE OF WATER
2.3 RCC MIX DESIGN
2.3.1 General
2.3.2 Evaluation of Materials Sources
2.3.3 Laboratory Mixture Proportioning
2.3.4 Pre-Construction Confirmation Testing
2.3.5 Construction Quality Assurance/Quality Control Testing
2.3.6 Final Confirmation of the Mixture
2.4 RCC MIXING AND DELIVERY SYSTEMS
2.5 LIFT SURFACE TREATMENT
2.6 RCC TEMPERATURE CONTROL
2.7 CRACK CONTROL AND JOINTS
2.8 SURFACE FINISH AND TOLERANCES
CHAPTER 3 - CATEGORIES OF RCC DAM REHABILITATION
3.1 RCC FOR DAM OVERTOPPING PROTECTION
3.1.1 General
3.1.2 Foundation Preparation
3.1.3 Uplift Control
3.1.4 Extension of Outlet Pipes and Conduits
3.1.5 Embankment Slope
3.1.6 Thickness of RCC Protection
3.2 RCC FOR DAM STABILITY IMPROVEMENTS
3.2.1 General
3.2.2 Foundation Preparation
3.2.3 Demolition and Preparation of Surfaces of Existing Structures
3.2.4 Internal Drainage and Galleries (Including Access)
3.2.5 Surface Finish/Downstream Facing
3.2.6 Extension of Outlet Works
3.3 RCC FOR SPILLWAYS
3.3.1 General
3.3.2 Preparation of Surfaces of Existing Structures
3.3.3 Foundation Preparation and Dewatering
3.3.4 Internal Drainage
3.3.5 Surface Finish and Tolerances
3.3.6 RCC Placement
3.3.7 Crest Sections
3.4 RCC FOR REMEDIATING OTHER DAM DEFICIENCIES
3.4.1 General
3.4.2 RCC Used for Raising Dams
3.4.3 RCC Used for Seepage Control
3.4.4 RCC Used for Embankment Replacement
CHAPTER 4 - SPECIFICATIONS
4.1 AVAILABLE GUIDE SPECIFICATIONS, STANDARD PRACTICES, AND RELATED COMMENTARIES
4.2 SUBMITTALS
4.3 TEMPERATURE RESTRICTIONS
4.4 LIFT MATURITY
4.5 CONTRACTION JOINTS (VERTICAL JOINTS)
4.6 WEATHER RESTRICTIONS AND PROTECTION
4.7 RCC MIXING
4.8 RCC DELIVERY
4.9 RCC PLACEMENT AND COMPACTION
4.10 RCC CURING
4.11 CONSTRUCTION MATERIALS
4.11.1 Aggregates
4.11.2 Cement
4.11.3 Pozzolan
4.11.4 Admixtures
4.11.5 Water (Source)
4.12 MEASUREMENT AND PAYMENT
4.13 QUALITY CONTROL
CHAPTER 5 - PRE-CONSTRUCTION
5.1 GENERAL
5.2 PRE-QUALIFICATION OF CONTRACTORS
5.3 PRE-BID MEETING
5.4 BID SUBMITTALS
5.4.1 Personnel
5.4.2 Equipment
5.4.3 Plan of Execution
5.4.4 Construction Schedule
5.4.5 Source of Construction Materials
5.4.6 Subcontractors
CHAPTER 6 - CONSTRUCTION
6.1 GENERAL
6.2 PRE-CONSTRUCTION CONFERENCE
6.3 PROJECT MANAGEMENT
6.4 SUBMITTALS
6.5 TEST SECTION
6.6 PARTNERING
6.7 QUALITY CONTROL AND TESTING
6.8 STORAGE AND HANDLING OF MATERIALS
CHAPTER 7 - POST-CONSTRUCTION
7.1 GENERAL
7.2 DOCUMENTS
7.3 PERFORMANCE MONITORING
7.3.1 First Filling
7.3.2 Visual Inspection
7.3.3 Instrument Monitoring
7.4 MAINTENANCE
BIBLIOGRAPHY
|