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Low alkalinity gel material for preparing concrete artificial reef and preparation thereof

A technology for cementing materials and artificial fish reefs, which is applied in the field of building materials, can solve the problems of increased cost of fish reefs, unfavorable growth of brown algae, red algae and microorganisms, and decreased early strength of concrete, and achieves the advantages of being conducive to growth and habitat, promoting The effect of marine ecological restoration and energy saving

Active Publication Date: 2009-05-27
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the addition of a large amount of admixtures such as fly ash, the early strength of concrete is reduced.
The use of silica ultrafine powder will greatly increase the cost of fish reefs
While using humid heat CO 2 The technology of steaming in the atmosphere will generate a large amount of CaCO 3 , it will promote the reproduction of lime algae, but the growth of diatoms, green algae, brown algae and red algae and microorganisms that are beneficial to aquatic resources is greatly unfavorable

Method used

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  • Low alkalinity gel material for preparing concrete artificial reef and preparation thereof
  • Low alkalinity gel material for preparing concrete artificial reef and preparation thereof
  • Low alkalinity gel material for preparing concrete artificial reef and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Mix and grind water-quenched blast furnace slag at 60% by weight with 10% fly ash, 25% phosphogypsum and 5% ferric sulfate to achieve a specific surface area of ​​750m 2 / kg, the low-alkalinity cementitious material used to manufacture concrete artificial fish reefs is obtained. The cementitious material is mixed with water, the water / cement ratio is 0.22, and 1% UNF-5 superplasticizer is added. The prepared clean slurry test block was maintained at 20°C and a relative humidity of 95%. After curing, the compressive strength of the clean pulp test block at each stage is 28.5MPa on 1 day, 58.7MPa on 3 days, 79.6MPa on 7 days, and 96.4MPa on 28 days. The test block after curing for 28 days was broken and ground to a specific surface area of ​​250m 2 / kg, 80 micron sieve is 5.6%. Soak the ground sample powder in seawater with a weight ratio of 1:1 at 20°C for 7 days, and mix for 60 minutes every day. Filter the soaked mud and measure the pH value of the filtrate. Add f...

Embodiment 2

[0027] Mix 80% water-quenched blast furnace slag with 5% oil shale refinery residue, 10% anhydrite and 5% ferric sulfate to achieve a specific surface area of ​​650m 2 / kg, the low-alkalinity cementitious material used to manufacture concrete artificial fish reefs is obtained. The cementitious material is mixed with water, the water / cement ratio is 0.22, and 1% UNF-5 superplasticizer is added. The prepared clean slurry test block was maintained at 20°C and a relative humidity of 95%. The compressive strengths of the clean pulp test blocks after curing are 23.5MPa at 1 day, 59.7MPa at 3 days, 89.6MPa at 7 days, and 106.4MPa at 28 days. The test block after curing for 28 days was broken and ground to a specific surface area of ​​250m 2 / kg, 80 micron sieve is 5.8. Soak the ground sample powder in seawater with a weight ratio of 1:1 at 20°C for 7 days, and mix for 60 minutes every day. Filter the soaked mud and measure the pH value of the filtrate. Add fresh seawater to the f...

Embodiment 3

[0038] Pre-grind water-quenched blast furnace slag to a specific surface area of ​​650m 2 / kg, then the ground slag superfine powder is mixed with 53% by weight, 20% fly ash, 25% desulfurized gypsum and 2% ferric chloride to make a specific surface area of ​​800m 2 / kg, the low-alkalinity cementitious material used to manufacture concrete artificial fish reefs is obtained. The cementitious material is mixed with water, the water / cement ratio is 0.22, and 1.5% of UNF-5 superplasticizer is added. The prepared clean slurry test block was maintained at 20°C and a relative humidity of 95%. After curing, the compressive strength of the clean pulp test block at each stage is: 38.5MPa in 1 day, 65.7MPa in 3 days, 84.6MPa in 7 days, and 103.5MPa in 28 days. The test block after curing for 28 days was broken and ground to a specific surface area of ​​250m 2 / kg, 80 micron sieve is 5.8. Soak the ground sample powder in seawater with a weight ratio of 1:1 at 20°C for 7 days, stirring ...

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Abstract

The invention relates to a low-alkalinity gel material for manufacturing artificial concrete fishing rocks and a preparation method thereof. The low-alkalinity gel material for manufacturing the artificial concrete fishing rocks is characterized by comprising the following raw materials by weight percentage: 40 to 80 percent of blast-furnace water-granulated slag, 5 to 25 percent of fly ash, furnace slag, self-igniting coal slack or oil shale slag, 10 to 30 percent of natural dihydrate gypsum, anhydrite, semi-hydrated gypsum, desulfurated gypsum, phosphogypsum or fluorgypsum, and 1 to 5 percent of ferric sulfate, ferrous sulfate, ferric chloride, ferrous chloride, ferric nitrate or ferrous nitrate. The raw materials are independently ground or mixed and ground until the specific surface area is between 500 and 800 square meters per kilogram, and uniformly mixed to obtain the low-alkalinity gel material for manufacturing the artificial concrete fishing rocks. The gel material can not generate Ca(OH)2 after hydration. The pH value of the surface of concrete prepared by the gel material can be the same as that of seawater in natural sea areas, so that the concrete is favorable for propagation of algae, microorganisms and hydrophyte which are favorable for fish, shrimps and seashells; and simultaneously, the concrete has high strength, so as to meet the demands of constructing the artificial fishing rocks and resisting impact of ocean tides and ocean waves.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a low-alkalinity gelling material used for manufacturing concrete artificial fish reefs and a preparation method thereof. Background technique [0002] Artificial reefs refer to the artificial setting of structures in waters to improve, restore and optimize the habitat of aquatic organisms, and provide places for fish and other organisms to feed, reproduce, grow and develop, so as to protect, multiply resources and increase fish catches. the goal of. While effectively controlling land-based pollution and deepening pollution control, the restoration and improvement of the offshore ecological environment is becoming increasingly important. The establishment of artificial reefs and the development of marine pastures are considered to be effective methods for coastal ecological restoration and promotion of fishery production. The mechanism of marine ecological restoration of artif...

Claims

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Application Information

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IPC IPC(8): C04B7/28
CPCC04B2111/24C04B11/002C04B28/14C04B2111/1025Y02W30/91C04B18/049C04B18/08C04B18/141C04B22/08C04B22/12C04B22/149C04B18/06
Inventor 倪文孙恒虎高艳利殷小波张玉燕郑永超
Owner UNIV OF SCI & TECH BEIJING
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