Lessons Learned About Sand

Construction Aggregates: How Important are They? Aggregates are very important because it supplies the needed strength for concrete. Concrete transitions are the interfacial region between the aggregate and cement paste and this is the one that is responsible in giving compressive strength to the cement. Aggregates have to be round and equiangular in size and must not be flaky and irregular. However, the use of angular aggregates is advised more because such kind of aggregate have a good interlocking effect which have minimum surface area and needs less mortar in covering the surface area. During the extraction time of the aggregates, care must be taken to make the aggregate go sieve analysis or washing before this will be used. Because any presence of harmful materials that involves clay, silt or acidic salts could affect the strength and the durability of concrete, which will lead to inhomogeneity in composition and in the failure of the structure if this will be subjected to eccentric loading. Some associations specify four grading zones for fine aggregates placed in order of decreasing particle size which starts from coarse sand and ends with fine sand. You must consider avoiding using fine sand when it comes to making RCC structures because these are porous and can in fact cause corrosions to the reinforcements.
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Fine aggregates includes crushed natural gravel, natural sand and crushed natural stones and these particles must be able to pass through sieve openings for about 4.75mm, but the ones that are completely retained in it are the coarse aggregates that includes uncrushed gravel, stone and big boulders.
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Aggregates needs to be chemically inert in nature and has to be sufficiently tough, hard and must have good bearing capacity. A well-graded aggregate that is used in a cement mixture is able to help reduce the presence of air voids and it also helps in providing sufficient strength and durability for the concrete. There are some tests which are carried out to some aggregates like impact tests, abrasion tests and soundness tests of aggregates that are done through dissolving them in a certain solution of sodium and magnesium sulphate. In providing support for concrete dams that has a huge mass, aggregates that were formed by igneous rocks has to be used. Even when aggregates are commonly known as inert fillers in concrete, various properties of aggregates are able to give a large impact when it comes to durability, strength, workability and on the economy of concrete. The different properties of aggregates will allow designers and contractors with the most flexible option to meet their design and construction requirements.