April 1980 Table of Contents

Features Site-Precasting

Precasting is often thought of as a factory operation but many contractors today have staffs with sufficient ability and experience to do good precasting work themselves. Read more

Features Excess Water Can Be a Costly Ingredient in Concrete

Water is certainly a necessary ingredient in concrete. However, only about 2 gallons are really needed to hydrate one 94-pound bag of cement. Read more

Features When Wood Decks Deteriorate, Replace with Concrete

The repair and restoration of elevated residential wood walkways would seem like an unusual concrete use. Read more

Problem Clinic Slabjacking

What is your opinion of the mudjack method of repairing sunken sidewalks? We are considering repairing approximately 1596 square feet of sunken sidewalks by having 2-inch holes drilled in the concrete, then using a mudjack to pump in a mixture of lime, wa Read more

Problem Clinic Crushed Aggregate Subbase Not Always Needed

What would happen if I omitted the crushed aggregate subbase under a warehouse floor? The soil is firm and dry, and in a well-drained location. Read more

Problem Clinic Equipment For Flame Finishing or Cleaning

The May 1978 issue of Concrete Construction contains an article on the flame treatment of concrete for finishing or cleaning. The article, however, fails to give any information on the availability of such equipment and the cost associated with it. Read more

Problem Clinic A Cause of Unsatisfactory Shotcrete

The walls of some tunnels between several of our plant buildings were made by wet-mix shotcreting. The shotcrete material was brought to the job from a ready mixed concrete plant and fed into the hopper of the shotcreting equioment. In order to minimize d Read more

Problem Clinic Force Needed to Separate Tilt-Up Panel From Slab

How much additional force or suction do we have to figure on to break the initial bond between a tilt-up panel and the slab it has been cast on? Read more

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