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4 giorni fa · concrete, in construction, structural material consisting of a hard, chemically inert particulate substance, known as aggregate (usually sand and gravel), that is bonded together by cement and water. Among the ancient Assyrians and Babylonians, the bonding substance most often used was clay.
- The Editors of Encyclopaedia Britannica
- Concrete consists of a solid and chemically inert particulate substance, called aggregate (usually sand and gravel), bonded together by cement and...
- In 1824 an English inventor, Joseph Aspdin, burned and ground together a compound of limestone and clay. This mixture, called portland cement, has...
- Concrete strength is affected by environmental factors, especially temperature and moisture. If it dries prematurely, it may be unable to resist un...
17 mag 2024 · Although vernacular buildings like barns and cottages were sometimes unornamented, what is striking is how far down the prestige spectrum ornament reached: our ancestors ornamented bridges, power stations, factories, warehouses, sewage works, fortresses, and office blocks.
6 mag 2024 · But first, let’s take a look at how concrete is made: 1. All-Purpose Concrete. Out of all the types of concrete, all-purpose concrete is the most popular in the U.S. It is made from cement, air, water, sand, and gravel. The ratios are 10% cement, 20% air and water, 30% sand, and 40% gravel. It is mainly used for exterior residential jobs.
3 mag 2024 · 더 콘크리츠, 2003https://hyunjiwoon.tistory.com/3571Boy, do you hear me say소년, 내가 말하는 게 들려?Do you hear me say now?지금 내가 말하는 게 ...
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15 mag 2024 · New modelling reveals that low-carbon concrete developed at RMIT University can recycle double the amount of coal ash compared to current standards, halve the amount of cement required and...
30 apr 2024 · Results are illustrated that the positive-curing temperature and curing age have beneficial effects on the mechanical properties of concretes, the compressive strength of concretes increases with the curing temperature raised.
3 giorni fa · To produce sustainable concrete with fine sands that are not usable until now – this was the approach of Multicon for inventing a new method for processing and utilizing regional fine and crushed sands, recycled mineral materials up to the use of desert sand (in the MENA countries, among others) that are not suitable so far.
