ACI 304.4R 2020

$31.96

ACI 304.4R-20: Placing Concrete with Belt Conveyors

Published By	Publication Date	Number of Pages
ACI	2020	20

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Category: ACI

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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.

PDF Catalog

PDF Pages	PDF Title
3	304.4R-20.pdf TITLE PAGE
4	CHAPTER 1—INTRODUCTION 1.1—General 1.2—History 1.3—Concrete conveyor development CHAPTER 2—DEFINITIONS CHAPTER 3—DESIGN CONSIDERATIONS 3.1—General requirements
5	3.2—Concrete ribbon parameters
6	3.3—Belt charging 3.4—Belt discharge 3.5—Belt conveyor design principles
8	3.6—Concrete mixture proportioning for conveying
9	3.7—Specifications CHAPTER 4—TYPES OF CONVEYORS AND FUNCTIONS 4.1—General 4.2—Portable conveyors 4.3—Feeder conveyors
11	4.4—Spreading conveyors
13	4.5—Conveyor combinations 4.6—Special belt conveyors
14	4.7—Truck-mounted conveyors
15	4.8—Economics of conveyor placement
16	CHAPTER 5—FIELD PRACTICE 5.1—Selection of conveyors 5.2—Actual capacity 5.3—Conveyor charging
17	5.4—Discharge control 5.5—Maintenance
18	CHAPTER 6—INSPECTION AND TESTING 6.1—Concrete inspection 6.2—Testing CHAPTER 7—REFERENCES Authored references