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In philosophy and the arts, a fundamental distinction exists between abstract and concrete entities. While there is no universally accepted definition, common examples illustrate the difference: numbers , sets , and ideas are typically classified as abstract objects, whereas plants , dogs , and planets are considered concrete objects.
Realia, whether traditional or virtual, have been found to be useful to improve the retention of concepts learned in the classroom. Real specimens such as plants, machines or tools enrich learning and make it more concrete, authentic and interesting as the learner is made to handle and study these things directly. The presentation of real ...
All concrete structures will crack to some extent, due to shrinkage and tension. Concrete which is subjected to long-duration forces is prone to creep. The density of concrete varies, but is around 2,400 kilograms per cubic metre (150 lb/cu ft). [1] Reinforced concrete is the most common form of concrete.
Prestressed concrete is a form of reinforced concrete that builds in compressive stresses during construction to oppose tensile stresses experienced in use. This can greatly reduce the weight of beams or slabs, by better distributing the stresses in the structure to make optimal use of the reinforcement.
Rowland and Schweigert propose that tangible symbols can be divided into hierarchical categories, ranging from most concrete to most abstract symbols: [2] [3] Identical objects are real items that are equal to their referent and are the most concrete type of tangible symbol. An example includes using a toothbrush to represent "brush your teeth ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 17 February 2025. Process of building or assembling a building or infrastructure For other uses, see Construction (disambiguation). "Construction site" redirects here. Not to be confused with Construction Site (TV series). Construction site and equipment prepared for start of work in Cologne, Germany ...
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United States Navy Seabees use a screed (noun) to screed (verb) wet concrete. The form-work acts as screed rails.. In the United States, a person called a concrete finisher performs the process of screeding, which is the process of cutting off excess wet concrete to bring the top surface of a slab to the proper grade and smoothness.