207.6R-17: Report on the Erosion of Concrete in Hydraulic Structures

207.6R-17: Report on the Erosion of Concrete in Hydraulic Structures

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Description

This report outlines the causes, control, maintenance, and repair of erosion in hydraulic structures. Such erosion occurs from three major causes: cavitation, abrasion, and chemical attack. Design parameters, materials selection and quality, environmental factors, and other issues affecting the performance of concrete are discussed.

Evidence exists to suggest that, given the operating characteristics and conditions to which a hydraulic structure will be subjected, the concrete can be designed to mitigate future erosion. However, when operational factors change or are not clearly known and erosion of concrete surfaces occurs, repairs should follow. This report addresses the subject of concrete erosion, inspection techniques, and repair strategies, providing references to a more detailed treatment of the subject.

Keywords: abrasion; aeration; cavitation; chemical attack; concrete dams; corrosion; erosion; hydraulic structures; spillways.

 

Document Details

Author: ACI Committee 207

Publication Year: 2017

Pages: 0.00

ISBN:

Formats: PDF

Table of Contents

CHAPTER 1—INTRODUCTION AND SCOPE

1.1—Introduction

1.2—Scope

CHAPTER 2—NOTATION

2.1—Notation

CHAPTER 3—EROSION BY CAVITATION

3.1—Mechanism of cavitation

3.2—Cavitation index

3.3—Cavitation damage

CHAPTER 4—EROSION BY ABRASION

4.1—General

4.2—Stilling basin damage

4.3—Power plant tailrace damage

4.4—Navigation lock damage

4.5—Tunnel lining damage

4.6—Hydraulic jacking

CHAPTER 5—EROSION BY CHEMICAL ATTACK

5.1—Sources of external chemical attack

5.2—Erosion by mineral-free water

5.3—Erosion by miscellaneous causes

CHAPTER 6—CONTROL OF CAVITATION EROSION

6.1—Hydraulic design principles

Example 1

6.2—Cavitation indexes for damage and construction tolerances

Example 2

6.3—Using aeration to control damage

6.4—Materials

6.5—Materials testing

6.6—Construction practices

CHAPTER 7—CONTROL OF ABRASION EROSION

7.1—Hydraulic considerations

7.2—Materials evaluation

7.3—Materials

CHAPTER 8—CONTROL OF EROSION BY CHEMICAL ATTACK

8.1—Control of erosion by mineral-free water

8.2—Control of erosion from acid attack due to bacterial action

8.3—Control of erosion by miscellaneous chemical causes

CHAPTER 9—PERIODIC INSPECTIONS AND CORRECTIVE ACTION

9.1—General

9.2—Inspection program

9.3—Inspection procedures

9.4—Reporting and evaluation

CHAPTER 10—REPAIR METHODS AND MATERIALS

10.1—Design considerations

10.2—Methods and materials

CHAPTER 11—REFERENCES

Authored documents

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