Recycled concrete with high slump retaining performance and preparation method thereof
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A recycled concrete, performance technology, applied in the field of concrete, can solve the problems of poor workability of recycled concrete, loss of concrete slump, rough surface of recycled aggregate, etc., to achieve the effect of reducing agglomeration, slump protection, and improving workability
Active Publication Date: 2022-01-14
深圳市福盈混凝土有限公司
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Problems solved by technology
For commercial concrete, the mixing station is usually set at the edge of the city. The concrete will go through a period of time from the completion of the mixing to the transportation to the construction site and then to the start of construction. This period of time will easily lead to the loss of slump of the concrete.
[0004] For recycled concrete, the recycled aggregate used has rough surface, high porosity, and high water absorption rate, which will affect the fluidity of cement slurry. Compared with ordinary concrete, the workability of recycled concrete is worse. The slump loss is relatively larger
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Embodiment 1
[0052] Raw materials: 400kg of cement, 450kg of sand, 650kg of natural aggregate, 200kg of recycled aggregate, 80kg of fly ash, 50kg of mineral powder, 150kg of water, and 2kg of slump-preserving polycarboxylate superplasticizer A.
[0053] The preparation process is:
[0054] (1) Stir and mix cement, sand, natural aggregate, recycled aggregate, fly ash, and mineral powder evenly to obtain dry material;
[0055] (2) Add the slump-retaining polycarboxylate superplasticizer into water, mix evenly, add it to the dry material, and stir evenly.
Embodiment 2
[0057] Raw materials: 420kg of cement, 500kg of sand, 690kg of natural aggregate, 230kg of recycled aggregate, 100kg of fly ash, 60kg of mineral powder, 170kg of water, and 3kg of slump-preserving polycarboxylate superplasticizer B.
[0058] The preparation process is:
[0059] (1) Stir and mix cement, sand, natural aggregate, recycled aggregate, fly ash, and mineral powder evenly to obtain dry material;
[0060] (2) Add the slump-retaining polycarboxylate superplasticizer into water, mix evenly, add it to the dry material, and stir evenly.
Embodiment 3
[0062] Raw materials: 500kg of cement, 650kg of sand, 800kg of natural aggregate, 300kg of recycled aggregate, 150kg of fly ash, 100kg of mineral powder, 250kg of water, 6kg of slump-preserving polycarboxylate superplasticizer C.
[0063] The preparation process is:
[0064] (1) Stir and mix cement, sand, natural aggregate, recycled aggregate, fly ash, and mineral powder evenly to obtain dry material;
[0065] (2) Add the slump-retaining polycarboxylate superplasticizer into water, mix evenly, add it to the dry material, and stir evenly.
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Abstract
The invention belongs to the technical field of concrete, and particularly relates to recycled concrete with high slump retaining performance and a preparation method of the recycled concrete. The recycled concrete comprises the following components in parts by weight: 400 to 500 parts of cement, 450 to 650 parts of sand, 650 to 800 parts of a natural aggregate, 200 to 300 parts of a recycled aggregate, 80 to 150 parts of fly ash, 50 to 100 parts of mineral powder, 150 to 250 parts of water and 2 to 6 parts of a slump-retaining polycarboxylate superplasticizer. According to the recycled concrete with the high slump retaining performance, natural aggregate and recycled aggregate are compounded, a proper amount of recycled aggregate is added, on the premise that the performance of the concrete is guaranteed, the problem of recycling of building waste is solved to a certain degree, in addition, slump loss of the concrete is reduced by adding the slump retaining type polycarboxylate superplasticizer, and the workability of the concrete is improved.
Description
technical field [0001] The application belongs to the technical field of concrete, and in particular relates to a recycled concrete with high slump retention performance and a preparation method thereof. Background technique [0002] In engineering construction, concrete is the most widely used building material, widely used in municipal, road, bridge, water conservancy, port, national defense construction and other fields. According to statistics, between 1991 and 2010, the total amount of discarded concrete in the world exceeded 2 billion tons. In recent years, with the rapid development of my country's urban construction, a large number of old buildings have been demolished, and the construction waste generated by the demolition of buildings and new buildings exceeds 100 million tons every year. Among all construction wastes, waste concrete accounts for the largest proportion, about to one third. If these waste concrete can be used rationally, it will not only effectivel...
Claims
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Application Information
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