Select the letter of a term you would like defined. You may select any letter section of the glossary from any glossary page.

• Jacking Equipment - In prestressed concrete, the device used to stress the tendons.
• Jacking Force - The temporary force exerted by the jacking device which introduces tension into the tendons.
• Jacking Stress - In prestressed concrete, the maximum stress occurring in a tendon during stressing.
• Keene's Cement - A finely ground high density plaster composed of anhydrous, (calcined or "dead burned") gypsum, the set of which is accelerated by the addition of other materials.
• Kelly Ball - A device for determining the consistency of fresh concrete. It is sometimes used as an alternative to the slump test.
• Laitance - A residue of weak and non-durable material consisting of cement, aggregate, fines, or impurities brought to the surface of overwet concrete by the bleeding water.
• Lift - Layer of concrete.
• Liquefaction - The change of state to a liquid. Term used instead of condensation in reference to substances, which are usually gaseous.

Contributions: Kaiser Cement, Portland Cement Association, Concrete Manual, Bureau of Reclamation, U. S. Department of the Interior and many other publications, with special thanks to Bob Cameron of W. R. Meadows. © 2008 Moxie International, Inc. All Rights Reserved.

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