When used as a base for roads or buildings, aggregate adds structural stability and improved drainage. But this advance site preparation adds significantly to cost and time of the project.
Adding aggregate to a composite material such as concrete or mortar can both lower the cost and raise the plasticity of the material. However, strength of these materials is lessened.
Some advantages of using a construction management system is that they provide an objective representation to protect the projects best interest. They can reduce overall production cost. The company would have centralized communication and enhanced quality control.
The main disadvantage of compacting concrete using a cement vibrator is the noise. The advantages of compacting concrete using a cement vibrator is to remove trapped air and excess water which then allows the concrete settle firmly.
It does last as long as a solid structure; weaker but can still hold weight.
Using pads minimises costs for the concrete necessary at the same time reduce excavation needed which you would usually use for pile, raft and strip foundations. However they cannot take excessive weight such as a concrete office block or be used on 'fragile ground'
Precast concrete is a concrete construction product that is made using molds under controlled process conditions. They are later on shipped to the construction sites for use. This technique first evolved in 1904, helps in the creation of concrete products that are much better in uniformity and quality as compared to the usual concreted that is poured and cured on the construction site. Prefabricated concrete is made in the plants that maintain controlled conditions resulting in a much better strength and quality than concrete construction. As these products are produced in the precast molds, the concrete gets a chance to cure to the desired specifications. There are numerous advantages of using these precast concrete products in various constructions. As compared to the concrete construction, these precast concrete blocks have greater fire resistance, strength, resistance to chemicals, lower maintenance costs, easy and quick installation and aesthetics. The plants processing precast concrete products have a specialization in this process and can offer them in various sizes, shapes, finish or colors that are not possible in the usual concrete construction projects. The cost of construction also reduces significantly as molds can be easily reused again and again. Aside from this, precast concrete products are made for connecting with one another to make a structure, so they save lot of expenses on labor as well. They also save lot of construction time as they are just lifted and installed in place in a mechanized way. Precast concrete products are being used worldwide for various construction projects. Many high risers, houses, warehouses, building walls, pump stations, containers for storing waste, transportation structures like platform risers and terminal buildings are made using precast concrete. Many houses are now being made using precast concrete walls because they are more durable and entail low labor cost. The walls made using prefabricated concrete can last much longer than simple concrete construction due to their high resistance to elements. The walls that are made using prefabricated concrete can either be single layered or double layered according to the design requirements. The double layered walls are sometimes called sandwich walls because they have a wide layer of insulation in between the two concrete layers. As these walls are made to the exact specifications, they can be produced with the exact access openings for doors, windows or pipes.
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disadvantages *not to scale *there are limitations