February 1981 Table of Contents

Features Steel Corrosion Damage on Vertical Concrete Surfaces Part II

To date there is not a large body of experience with repair of cracked and spalled vertical surfaces in architectural-quality structures, so repair and restoration work on these surfaces has been adapted from procedures that have proved effective for bridge and parking deck repairs taking into account the added difficulty of working on vertical surfaces to which access is frequently difficult. Read more

Features Checklist for Safe Construction of Formwork

Safety in formwork is twofold: safe working conditions for the workers plus adequate design and construction to ensure safety of the structure. Read more

Features What to Specify for Successful Commercial and Industrial Floors on Grade

The previous article explained the basics of concrete as they relate to concrete floors on grade. Read more

Features Workman, Spare That Slab

When thought is being given to replacing cracked and settled slabs on ground, repair by slabjacking should be considered. Read more

Features What Every Floor Designer Should Know About Concrete

During the design stage of most buildings, little if any attention is given to floors on grade. Read more

Features Post-Tensioning: It Makes Sense for Earth-Sheltered Homes

Correctly built, earth-sheltered homes are most energy efficient. Incorrectly built, they are energy disasters. Read more

Features Segmental Bridges: the Best in the Business

Segmental concrete bridge construction offers excellent economics as well as many different construction techniques that can be used. Read more

Problem Clinic Use of Long-Handled Trowel

My company mainly does outdoor residential work. Our finishing procedure for drives and walks is to straightedge, bull float, hand float, hand trowel and broom. We are thinking of speeding up production by using a large trowel with a handle commonly calle Read more

Problem Clinic Earth-Sheltered Wood Buildings

A recent issue contained some comments regarding disadvantages of wood foundations. Would you send us your views on the subject because we wish to build an underground house soon. Read more

Problem Clinic Leakage in Earth-Sheltered House

We have a 32- by 120-foot earth-sheltered house built of precast prestressed slabs, with a 2-inch-thick cast-in-place deck over the slabs, coated with two coats of waterproofer, insulated with 4-inch polystyrene slabs, covered with polyethylene with only Read more

Problem Clinic Floor Traffic Stripes

Please send us information about a method of applying a paint to an industrial floor exposed to oil spills and heavy forklift traffic. We apply a 6-inch-wide band to indicate aisle limits and no-admission areas. Our present procedure of using a name-brand Read more

Problem Clinic Origin of Concrete

During a conversation on one of our jobs the question arose as to when concrete was first used in the United States? Also, was it used in any other country before it was used here? Read more

Problem Clinic Honeycomb Tolerances for Sandblasted Surfaces

We have recently had stringent inspections of architectural concrete with a sandblasted finish. Many of the defects relate to honeycomb revealed by the sandblasting. Please send any literature you have about tolerances for percent defective area allowable Read more

Problem Clinic Rigid Insulation for Roof Decks

In our area of Florida insulation is required in both the exterior walls and roof. All the insulating firms around here insulate standard homes with wood roofs. We would like to find a rigid insulation that can be placed before the roof is placed. Read more

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