January 2003 Table of Contents

Features Climbing Formwork System Goes Horizontal

Environmental protection issues shaped the plans for a twin-tube vehicular tunnel, 1.45 miles long, outside the village of Steinhaus in Upper Austria. Read more

Features Plywood Understood

Successful and cost-effective form development must consider both engineering requirements and architectural intentions. Structural wood-forming panels can fulfill a wide variety of forming needs. Read more

Features Internal or External Vibration?

Internal vibration is vibrating the concrete from within the formwork, while external vibration is vibrating the formwork from the outside. Read more

Features How Poor Curing Leads to Scaling

Scaling of concrete driveways and sidewalks occurs all too often during the first season’s exposure to cyclic freezing and thawing. Read more

Features Whitetopping on the Navajo Reservation

After attending a whitetopping demonstration in Albuquerque in the fall of 2001 and then carefully reviewing the procedure, Max Bighorse, P.E., the Navajo Housing Authority design group’s civil engineer, decided to give whitetopping a try. Read more

Features Common Problems with F-Number Measurements

Common problems in F-number measurement arise on many jobs. Following ASTM E 1155 "Standard Test Method for Determining FF Floor Flatness and FL Floor Levelness Numbers," is essential. Read more

Artistry in Concrete Decorative Concrete Artistry in Concrete

The expanding field of decorative concrete owes much of its success to the development of more durable concrete. Read more

Decorative Concrete Removing Sealer from Decorative Concrete

Many decorative concrete contractors consider the removal of sealers to be one of the nastiest and most aggravating jobs they have to perform. Read more

Problem Clinic Core Test at 85%

ACI 301-99, Section, regarding core test results, maintains that concrete represented by core tests is considered adequate when the average compressive strength of the cores is equal to at least 85% of the specified strength. I’m looking for any i Read more

Problem Clinic Gunite or Shotcrete?

I am planning to have a swimming pool built and have been told that there is a difference in strength and durability between shotcrete and gunite. Which is preferable for a swimming pool? Read more

Problem Clinic SCC for Piles

We are considering using self-consolidating concrete in bored cast-in-place piles up to 20-m deep. How can we check the level of compaction? Are there clear specifications for testing SCC and test specimens preparation? We cannot locate any ASTM or simila Read more

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