May 1983 Table of Contents

Features Cooling Concrete with Liquid Nitrogen

Concrete placement during hot weather can lead to problems if precautions are not taken to control placement temperatures. Read more

Features Post-Tensioning for Crack-Free Superflat Floors

There are some projects where cracking is just not acceptable. In a food warehouse, for example, sanitary considerations may require the filling of all cracks. Read more

Features Guide to Jointing Unreinforced Pavements

Joints in unreinforced pavements are located to control cracking, aid in construction and delineate driving or parking lanes while insuring the structural integrity and riding quality of a concrete pavement. Read more

Features Effect of Blasting, Jarring, and Other Transitory Vibrations on Fresh Concrete

The effect of nearby dynamite blasts, pile driving, or the simultaneous operation of machinery or vehicles on fresh or newly cast concrete is often questioned. Read more

Features What to Do with Concrete in Hot Weather

High air temperature during concreting, sometimes aggravated by the effects of wind or low relative humidity or both, can impair the quality of the concrete. Read more

Features Caisson Sunk for Water Intake

A cooling-water intake structure in Louisiana which provides cooling water for a coal-powered generating plant was built using the sinking caisson method. Read more

Features Sculptured Concrete Panels Feature Indian Design

The Naval Regional Medical Center in Bremerton, Washington is an architectural tribute to the region's native Indian heritage. Read more

Features Concrete for Deep Ocean Construction

The final phase of a 10-year study of deep ocean concrete structures conducted by the U.S. Naval Civil Engineering Laboratory (NCEL) in California has provided answers to some important questions. Read more

Problem Clinic Joints in Tennis Courts

A project consisting of three tennis courts and supplementary aprons is scheduled for bidding. The job is now set up as a blacktop paving project but the engineer will accept an alternate proposal for a concrete court system provided he can be assured of Read more

Problem Clinic Designing a Mix for Flexural Strength

Our ready mixed concrete company has received a request for concrete with a flexural strength of 670 psi. We have never had this kind of order before. Can you tell us what equivalent compressive strength such a concrete represents? Read more

Problem Clinic Flatness Costs Money

Some of your recent articles ("Can Your Floors Pass This Test?," June 1981, page 512; "The Floor Tolerance Conundrum," Read more

Problem Clinic Handles for Test Cylinders

Why don't compression test cylinders come with handles? They are awkward to carry, especially over rough terrain, and if you drop one you've lost your test data. Read more

Problem Clinic Hot Cement

Our firm is contemplating a job in Saudi Arabia where the cement would be shipped directly from the mill without storage before shipping. Is use of hot cement likely to cause cracking of the concrete in this hot, dry climate? Read more

Problem Clinic Cutting a Mass Concrete Wall

Would it be efficient to use concrete coring drills to cut a 3 1/2x8-foot opening in mass concrete? The wall is 6 feet thick at this point, so sawing would not be possible. Read more

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