Seawater coral sand ultra-high performance concrete and preparation method thereof

An ultra-high performance, coral sand technology, applied in the field of building materials, can solve the problems of ordinary steel fiber easy to rust manufacturing process, ultra-high performance concrete shrinkage, poor concrete workability, etc., to achieve enhanced physical adsorption capacity and stability, performance Improve and increase the effect of compactness and strength

Inactive Publication Date: 2021-03-26
CCCC THIRD HIGHWAY ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the deficiencies or defects in the above-mentioned prior art, the purpose of the present invention is to provide a seawater coral sand ultra-high performance concrete and its preparation method, which can effectively solve the poor workability and low strength of concrete existing in the existing coral concrete preparation technology and other problems, as well as the problems of large shrinkage of ultra-high performance concrete, easy corrosion of ordinary steel fibers and complicated manufacturing process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment 1 provides a seawater coral sand ultra-high performance concrete, including the following components in parts by weight: 1000 parts of coral medium sand in zone II, 800 parts of cement, 85 parts of modified metakaolin, 150 parts of silica fume, steel fiber 200 parts, 265 parts of seawater, 20 parts of water reducer and 1 part of defoamer.

[0030] Modified metakaolin is prepared by the following method:

[0031] Step (1): adding kaolin and fly ash to 8mol / L sodium hydroxide solution in a weight ratio of 4:1, stirring at room temperature for 30 minutes, drying to obtain a solid;

[0032] Step (2): Put the solid obtained in step (1) into a muffle furnace, raise the temperature from room temperature to 850°C at a rate of 40°C / min, keep it for 0.5 hours, then cool to room temperature, and grind to a fineness of 700 ~1000 meshes of finely ground powder to obtain the desired modified metakaolin.

[0033] Silica fume is SiO 2 Mass fraction ≥ 92%, specific su...

Embodiment 2

[0039] This embodiment 2 provides a kind of seawater coral sand ultra-high performance concrete and its preparation method, and the only difference with embodiment 1 is: the parts by weight of the components in the seawater coral sand ultra-high performance concrete is: coral sand 900 900 parts of cement, 100 parts of silica fume, 120 parts of modified metakaolin, 78 parts of steel fiber, 250 parts of water, 10 parts of water reducing agent, and 1 part of defoamer. are the same.

Embodiment 3

[0041] This embodiment 3 provides a kind of seawater coral sand ultra-high performance concrete and its preparation method, and the only difference from embodiment 1 is: 1100 parts of coral sand, 900 parts of cement, 250 parts of silica fume, 110 parts of modified metakaolin 156 parts of steel fiber, 250 parts of water, 20 parts of water reducer, 1 part of defoamer, the amount of each component is different but the parameters such as materials used are the same.

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Abstract

The invention discloses seawater coral sand ultra-high performance concrete, and belongs to the technical field of building materials. The seawater coral sand ultra-high performance concrete comprisesthe following components in parts by weight: 900-1100 parts of coral sand, 700-900 parts of cement, 100-270 parts of silica fume, 75-120 parts of modified metakaolin, 78-312 parts of steel fibers, 200-300 parts of water, 5-20 parts of a water reducing agent, and 1-2 parts of an defoaming agent. According to the concrete, coral sand is adopted to replace quartz sand to serve as an aggregate, by means of the water absorption and water return characteristics of the coral sand, the internal curing effect can be achieved in the concrete, self-shrinkage of seawater coral sand ultra-high performanceconcrete can be improved, corrosion of chloride ions in the ocean to concrete steel can be prevented by adopting modified metakaolin, and the durability of the concrete is further improved; stainlesssteel fibers are adopted to replace common steel fibers, the compressive strength and breaking strength of the concrete are improved, and the water reducing agent and the defoaming agent are adopted,so that the concrete has good workability and compactness. The proportion is reasonable and scientific, and the prepared seawater coral sand ultra-high performance concrete has the characteristics ofgood workability, high strength, low shrinkage and high durability.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a seawater coral sand ultra-high performance concrete and a preparation method thereof. Background technique [0002] The development of my country's marine economy and the protection of marine rights and interests have increased the demand for offshore island and reef engineering construction. At the same time, because island and reef buildings are easily eroded by the surrounding environment and maintenance is inconvenient, higher requirements are put forward for the mechanical properties and durability of concrete. . [0003] Ultra-high performance concrete is a fiber-reinforced cement-based composite material with ultra-high mechanical properties and ultra-long durability. Its mechanical properties develop rapidly. It can maintain the integrity of the concrete system when used to repair and strengthen concrete structures. Compared with organic polymers, it can redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B22/00C04B14/28
CPCC04B28/04C04B14/28C04B22/0026C04B2201/50C04B18/146C04B14/106C04B14/48C04B2103/302C04B2103/50
Inventor 王珏郑楠王亚楠高原张发盛高全青
Owner CCCC THIRD HIGHWAY ENG
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