July 1989 Table of Contents

Features How to Safely Use Powder-Actuated Tools

Occupational Safety and Health Administration (OSHA) requires training for the safe use of these tools. Read more

Features Fast Field Test for Chloride Ion chloride-contaminated concrete structures

Chloride contamination of reinforced concrete structures, usually caused by deicing salts or marine exposure, is recognized as a major contributor to structural deterioration by causing reinforcing steel corrosion. Read more

Features Dry-Cutting Saws Allow Pile Cutting in Cold Weather

With the help of dry-cutting, air-powered saws, construction workers from Raymond International Builders were able to keep a large pile driving project on schedule. Read more

Features Taking Much Bigger Jobs Can Put You Out of Business

Almost any construction firm can build a project two or three times larger than it normally does. But as the size increases, so does the strain on the company's resources and technical abilities. It can probably get the job done--but can it make a profit? Read more

Features Precast Concrete Forms the Backbone of the Channel Tunnel

The Channel Tunnel rail link between Britain and France is getting its shape and finish from reinforced concrete. Most of the concrete is in the form of precast reinforced segments. The curved segments are lifted and erected against the tunnel walls as the boring machines advance. Two casting factories, one at each end of the tunnel, provide the precast segments. Read more

Features Using Permanent Shoring Jacks to Repair Foundations

When soil settlement or expansion causes distress in one- or two-story homes deepening or rebuilding the foundation will usually solve the problem. But how can you carry out the repairs with the least stress on the building and its tenants? We've found a way that uses permanent shoring jacks. Read more

Features Choosing the Right Jackhammer Tool for the Job

Different tools let you break, cut, dig, or tamp with the same pneumatic breaker. But you can make the work easier and faster by choosing the right tool. Rather than basing tool choice on trial and error, learn which tool was made for each job. There are five basic categories of tools available: breakers; cutters; spades and frost wedges; bushing tools; and drivers and tampers. Read more

Features Raising a Floor Without Closing the Store

A highly experienced crew using button bit drills and a new-design grout pump helped American Concrete Raising Inc. to raise a settled floor slab in a supermarket--without closing the store during business hours. Read more

Features Slippery Floors? Try Grooving or Texturing

Smooth concrete floors can be dangerous. These floors often are exposed to water, oil, chemicals, powders, and dust. Just a thin layer of one of these substances on a smooth floor significantly reduces foot-to-floor or tire-to-floor contact. How can you increase the traction of smooth concrete floors and improve their safety? Read more

Problem Clinic How to Set Forms for Insulated Slab

We're going to be placing a 6-inch-thick concrete slab in a cold storage warehouse. The concrete has to be placed over 12 inches of expanded polystyrene insulation board. The insulation comes in 4x8 foot sheets that are 6 inches thick, so there will be tw Read more

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