August 1994 Table of Contents

Features Pump Line Safety

Pumping usually is an efficient and safe way to move concrete. But like other jobs that require working with heavy equipment, pumping can be dangerous if not done correctly. Read more

Features How a Concrete Pump Works

The pumping operation starts with the discharge of the concrete, usually from a ready mix truck, into a hopper large enough to hold a small supply of fresh concrete. Read more

Features Clearing Pump Line Blockages

The three main causes of concrete pumping system blockages are: mix design deficiencies, pipeline and joint deficiencies, and operating error or careless use of the discharge hose. Read more

Features What's New in Truck-Mounted Boom Pumps

The key features of some of the newest models being offered include: Short boom sections that enhance maneuverability, long-reach booms and swing-valve boom pumps. Read more

Features Selecting and Operating a Portable Hydraulic Power Unit

Most hydraulic tools used at a jobsite require a self-contained hydraulic power unit that is powered by a diesel or gasoline engine or an electric motor. Read more

Problem Clinic Maximum Allowable Time From Initial Batching to Placement

I am involved with a large urban concrete project where concrete delivery is sometimes delayed by traffic congestion. The specification requires concrete placement within 90 minutes of batching at the plant. What is the significance of this 90-minute spec Read more

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