Production of Aggregate

CHAPTER

Construction Planning, Equipment, and Methods

Sixth Edition

AGGREGATE PRODUCTION
• A. J. Clark School of Engineering •Department of Civil and Environmental Engineering

14

By Dr. Ibrahim Assakkaf ENCE 420 – Construction Equipment and Methods Spring 2003 Department of Civil and Environmental Engineering University of Maryland, College Park

CHAPTER 14. AGGREGATE PRODUCTION

Slide No. 1
ENCE 420 ©Assakkaf

PRODUCTION OF CRUSHEDSTONE AGGREGATE
The production of crushed-stone aggregate involves:
Drilling Blasting Loading Transporting Crushing Screening Product handling and storage

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CHAPTER 14. AGGREGATE PRODUCTION

Slide No. 2
ENCE 420 ©Assakkaf

PRODUCTION OF CRUSHEDSTONE AGGREGATE

In operating a quarry and crushing plant, the drilling pattern, the amount of explosives, the size shovel or loader used to load the stone, and the size of the primary crusher should be coordinated to assure that all stone from the quarry can be economically utilized.

CHAPTER 14. AGGREGATE PRODUCTION

Slide No. 3
ENCE 420 ©Assakkaf

RECOMMENDED MINIMUM SIZES OF PRIMARY CRUSHERS
Table 1

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CHAPTER 14. AGGREGATE PRODUCTION

Slide No. 4
ENCE 420 ©Assakkaf

TYPES OF CRUSHERS

Crushers are classified according to the stage of crushing which they accomplish, such as:
Primary Secondary Tertiary

A primary crusher receives the stone directly from a quarry after blasting, and produces the first reduction in size.

CHAPTER 14. AGGREGATE PRODUCTION

Slide No. 5
ENCE 420 ©Assakkaf

TYPES OF CRUSHERS

The output of the primary crusher is fed to a secondary crusher, which further reduces the stone size. Some of the stone may pass through four or more crushers before it is reduced to the desired size. The degree of breakage is spread over several stages as a means of closely controlling product size and limiting waste material.

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CHAPTER 14. AGGREGATE PRODUCTION

Slide No. 6
ENCE 420 ©Assakkaf

TYPES OF CRUSHERS