September 2000 Table of Contents

Features Tips for Safe Pumping

Whatever the cause, most pumping accidents can be prevented if you adhere to some simple rules before, during, and after the pumping operation. Not only can your efforts help prevent a tragic death, they can also avert costly equipment damage and jobsite delays. Read more

Features Tilt-Up City

Concrete contractor and tilt-up entrepreneur Larry Clark discusses the construction of Capital Centre, an all-tilt-up sports and entertainment complex he is building in Lansing, Mich. The facility includes a 52,000-square-foot basketball stadium, a 176,00-square-foot building for soccer, hockey, and gymnastics, and a health and fitness building with an indoor running track. For the walls of all three buildings, Clark is using more than 180,000 square feet of tilt-up sandwich panels as tall as 45 feet. Read more

Features Profiting from Safety

Reducing the number of construction-related deaths and injuries is the most compelling reason for improving jobsite safety. The pain and suffering of the victims and their families and friends are immeasurable costs associated with construction accidents. Easier to quantify are the direct and, to a lesser extent, indirect costs of worker injuries. Taking a close look at these costs will help you better understand the benefits of an effective safety program. Read more

Features Taking Control

When it comes to construction, he who has the plan has the control. Obviously, for any project (especially a large one), contractors should produce detailed plans, such as critical path management charts, that identify each phase of a construction project. Unfortunately, contractors seldom devote the same effort to creating weekly plans. And if they do create such plans, contractors seldom use them as their primary planning and communication tool. Read more

Features Troubleshooting: Form Streaking and Sand Streaking

The terms form streaking and sand streaking often are used interchangeably because the underlying causes are very similar. And both conditions are aggravated by harsh concrete mixes containing too few fines, overly wet mixes, and excessive vibration. Read more

Features Synthetic Fibers and Welded Wire Fabric: Comparing Benefits

When synthetic fibers first made a large-scale entry into the concrete construction market in the 1980s, a question arose that continues today: What are the comparative benefits of using these fibers or welded wire fabric (WWF), especially in flatwork? How much do fibers help in preventing cracking in slabs? Read more

Concrete Basics Flash Set and False Set

Contractors occasionally speak of getting a "hot load" of concrete, meaning the concrete stiffens quickly and is difficult to place, consolidate, and finish. Though hot loads can be caused by high concrete and air temperatures, certain cement or admixture properties can also lead to early stiffening. Read more

Problem Clinic Measuring Floor Curling

What's the easiest way to measure the extent and magnitude of floor curling on a very large warehouse floor? Is there a standard method for measuring curling? Read more

Problem Clinic Black Concrete

We are considering the use of integrally colored black concrete for a downtown sidewalk. How much more would the colored concrete cost than standard concrete? And should we consider using both integral color and black aggregate? If so, what's the cost of Read more

Problem Clinic Cause of Aluminum Pitting

We placed a concrete floor slab for a refrigerated room in a cold-storage facility. The room had an aluminum ceiling that is now pitted. The general contractor says water emitted by the concrete as it dried condensed on the ceiling and caused the pitting, Read more

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