Search results
Results from the WOW.Com Content Network
Concrete has a very low coefficient of thermal expansion, and as it matures concrete shrinks. 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]
Allammelech – within the Tribe of Asher land, described in the Book of Joshua. [1] Allon Bachuth; Alqosh, in the Nineveh Plains, mentiomed in the Book of Nahum; Ammon – Canaanite state; Attalia – In Asia Minor; Antioch – In Asia Minor; Arabia – (in biblical times and until the 7th century AD Arabia was confined to the Arabian Peninsula)
Nanoconcrete (also spelled "nano concrete"' or "nano-concrete") is a class of materials that contains Portland cement particles that are no greater than 100 μm [89] and particles of silica no greater than 500 μm, which fill voids that would otherwise occur in normal concrete, thereby substantially increasing the material's strength. [90]
The most common use for portland cement is in the production of concrete. [18] Concrete is a composite material consisting of aggregate (gravel and sand), cement, and water. As a construction material, concrete can be cast in almost any shape desired, and once hardened, can become a structural (load bearing) element.
Cementing has significant effects on the properties and stability of many soil materials. Cementation is not always easily identified and its effects cannot be easily determined quantitatively. It is known to contribute to clay tenderness and may be responsible for an apparent preconsolidation pressure.
A gravity dam is a dam constructed from concrete or stone masonry and designed to hold back water by using only the weight of the material and its resistance against the foundation. Gravity dams are designed so that each section of the dam is stable and independent of any other dam section.
Ancient world map, from Christian Topography, by Cosmas Indicopleustes.. The Christian Topography (Ancient Greek: Χριστιανικὴ Τοπογραφία, Latin: Topographia Christiana) is a 6th-century work, one of the earliest essays in scientific geography written by a Christian author.
A study that appeared in Nature Sustainability in 2018 predicts that concrete production will in the future increase pressure on water resources in regions susceptible to drought conditions, writing, "In 2050, 75% of the water demand for concrete production will likely occur in regions that are expected to experience water stress".