304.4R-20: Placing Concrete with Belt Conveyors

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Description

This report includes a short history on the early development of conveyor belts for transporting and placing concrete; the design of conveyor systems in relation to the properties of the plastic concrete, the delivery rate, and the job specifications; as well as belt widths, speeds, and angles of inclination as they apply to specific site requirements. Also discussed are the three types of concrete conveyors (portable, feeder, and spreader types) and their particular applications; field practices in the selection, use, and maintenance of conveyors; and the economics of belt conveyor placement. The quality of the in-place concrete and inspection procedures are also stressed.

Keywords:

belt conveyors; concrete construction; conveying; conveyors; economics; feeders; fresh concrete; inspection; maintenance; placing; quality control; workability.

 

Document Details

Author: ACI Committee 304

Pages: 16

ISBN: 9781641950992

Categories: Design, Installation, Quality Assurance

Formats: PDF

Table of Contents

CHAPTER 1—INTRODUCTION, p. 2

1.1—General, p. 2

1.2—History, p. 2

1.3—Concrete conveyor development, p. 2

CHAPTER 2—DEFINITIONS, p. 2

CHAPTER 3—DESIGN CONSIDERATIONS, p. 2

3.1—General requirements, p. 2

3.2—Concrete ribbon parameters, p. 3

3.3—Belt charging, p. 4

3.4—Belt discharge, p. 4

3.5—Belt conveyor design principles, p. 4

3.6—Concrete mixture proportioning for conveying, p. 6

3.7—Specifications, p. 7

CHAPTER 4—TYPES OF CONVEYORS AND FUNCTIONS, p. 7

4.1—General, p. 7

4.2—Portable conveyors, p. 7

4.3—Feeder conveyors, p. 7

4.4—Spreading conveyors, p. 9

4.5—Conveyor combinations, p. 11

4.6—Special belt conveyors, p. 11

4.7—Truck-mounted conveyors, p. 12

4.8—Economics of conveyor placement, p. 13

CHAPTER 5—FIELD PRACTICE, p. 14

5.1—Selection of conveyors, p. 14

5.2—Actual capacity, p. 14

5.3—Conveyor charging, p. 14

5.4—Discharge control, p. 15

5.5—Maintenance, p. 15

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