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A kind of coral sand admixture and its preparation method and application

A technology of coral sand and admixtures, applied in the field of admixtures, can solve problems such as difficulty in popularization and application, poor performance of coral sand concrete, and high construction costs

Active Publication Date: 2021-09-14
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention aims to propose a coral sand admixture to solve the problems of high construction cost of existing coastal projects and poor performance of coral sand concrete, which makes it difficult to popularize and apply

Method used

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  • A kind of coral sand admixture and its preparation method and application
  • A kind of coral sand admixture and its preparation method and application
  • A kind of coral sand admixture and its preparation method and application

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Embodiment Construction

[0020] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0021] The present invention will be described in detail below in conjunction with examples.

[0022] Table 1 shows the ratio of each component in the coral sand admixtures of Examples 1 to 6 of the present invention and the fineness and grinding parameters of the coral sand admixtures in each embodiment. Wherein, the solid content of polycarboxylate water reducer in the coral sand admixture of embodiment 1~embodiment 6 is preferably 40%, and the molecular structural formula of polycarboxylate water reducer is:

[0023]

[0024] In the molecular structural formula, m, n, and k are degrees of polymerization, * is the main chain, and m / n=3.5, k=50.

[0025] Table 1

[0026]

[0027] Adopt following method to prepare the coral sand admixture of embodiment 1~embodiment 6, specifically comprise the follow...

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Abstract

The invention provides a coral sand admixture and its preparation method and application. In terms of mass percentage, the raw material composition of the coral sand admixture is: coral sand: 63-71%, triisopropanolamine: 0.1-0.2% , calcium nitrite: 1.2‑2.1%, polycarboxylate superplasticizer: 1.9‑2.4%, and the balance is water. The coral sand admixture of the present invention uses coral sand as the main raw material, adopts a wet grinding process to improve its fineness, and the present invention adds triisopropanolamine, calcium nitrite and polycarboxylate water reducing agent in the wet grinding process On the one hand, the wet grinding efficiency can be further improved, thereby reducing the energy consumption for preparation; on the other hand, the coral sand admixture of the present invention can have good stability and dispersibility. Increase the fluidity and workability of concrete, reduce its slump loss, improve the impermeability and durability of concrete, and make the concrete 7d strength without loss, 28d concrete strength decrease less than 10%, 1d hydration heat reduction More than 20%.

Description

technical field [0001] The invention relates to the technical field of admixtures, in particular to a coral sand admixture and its preparation method and application. Background technique [0002] In marine concrete engineering, due to the long distance between the construction site and the supply site of raw materials, it brings great inconvenience to the transportation of raw materials. Coral sand is fragments of coral or shellfish. Its main component is calcium carbonate, which is abundant in the global ocean. When it is used to replace river sand to prepare mortar or concrete, it will reduce the compressive strength of mortar and concrete, but it will improve the strength of concrete. Anti-carbonization performance and anti-chloride ion penetration performance. [0003] Therefore, developing a coral sand admixture with excellent performance and using it in the preparation of cement-based materials (such as concrete) can not only solve the problem of raw material transpo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/32
CPCC04B40/0039C04B14/28C04B24/122C04B22/085C04B24/32
Inventor 谭洪波邓秀峰张迅聂康峻李懋高马保国
Owner WUHAN UNIV OF TECH
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