April 1981 Table of Contents

Features Special Cements for Special Purposes

Special cements are cements that serve some specific function such as altering the setting or hardening behavior of a concrete, producing different colors for architectural effects, imparting superior workability, imparting water retention and plasticity to mortars, resisting the penetration of water in walls or containment vessels or simply reducing the cost of the cementing agent. Read more

Features Waterproofing Checklist

The specifier and the contractor should understand one another's concepts, capabilities and expectations before the work starts. Read more

Features Update Arcosanti

Six shapes in concrete are sited along the rim of an otherwise barren mesa 65 miles north of Phoenix, Arizona. Read more

Features Waterproofing: Who Needs It?

Most concrete does not require waterproofing either because it is used where it is not exposed to water under pressure or because it is of such high quality that water cannot penetrate it. Read more

Features Dampproofing: Why, Where and How?

Dampproofing, according to ACI Committee 515, is the treatment of a surface or structure to resist the passage of liquid water in the absence of hydrostatic pressure. Read more

Features Waterproofing: Establishing a Barrier

Waterproofing is the treatment of a surface or a structure to prevent the passage of liquid water under hydrostatic pressure. Read more

Problem Clinic Cracking in Airport Pavement

We have been paving 12- to 15-inch-thick taxiways containing welded wire fabric located 1/3 the thickness from the top and lapped 12 inches. The taxiways are from 150 to 250 feet long and have joints every 50 feet, sawcut at night. Each taxiway consists o Read more

Problem Clinic Soy Bean Oil for Form Oil

Our local ready mixed concrete association is interested in the use of soy bean oil as a form release agent for architectural concrete. Is soy bean form oil ever specified for this use and does anyone market soy bean form oil commercially? Read more

Problem Clinic Troweling Out the Air

We do residential walks and driveways and we are always concerned about durability to freezing and thawing. I have been told that the entrained air can be troweled out of a surface if it is rubbed hard with float or trowel when the concrete is barely fini Read more

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