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Admixture special for high-performance marine concrete and production method thereof

A marine concrete and production method technology, applied in the field of special admixtures, can solve problems such as long concrete setting time, shrinkage cracks of silica fume concrete, inability to meet the high performance of concrete, and ultra-durable years

Inactive Publication Date: 2005-06-22
SHANGHAI RES INST OF BUILDING SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many problems in the application of fly ash, slag micropowder, silica fume and other industrial active external materials in concrete, such as too long concrete setting time and large drop in early strength caused by fly ash and slag micropowder activity. decline, silica fume concrete causes problems such as shrinkage cracks, and the existence of these problems seriously affects its effect on improving the durability of concrete
Therefore, the single mixing or simple multi-component mixing of industrial active external materials such as fly ash, slag powder, and silica fume obviously cannot meet the high-performance and ultra-durable concrete proposed for large-scale marine projects in recent years. Years (e.g. 100 years or more) required

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1 Production of special admixture for I-type marine concrete

[0040] Put 15t of slag fine powder, 0.6t of sodium naphthalenesulfonate and 0.4t of sodium sulfate into a mixer mill for 15 minutes of mixing and grinding at a speed of 17 rpm, then gradually add about 5t of fly ash, and continue mixing and grinding for 20 minutes After 10 minutes, take samples for rapid CaO measurement at the 10th minute, and adjust the amount of fly ash added according to the measurement results, blend the mill for 2 hours, and analyze the mixed abrasive particle size ≤ 10 μm, specific surface area ≥ 450m 2 / kg conforms to the finished product specification, discharges, and obtains 21t of I-type special admixtures. Its performance test values ​​are shown in Table 1.

Embodiment 2

[0041] Example 2 Production of Type II Marine Concrete Special Admixture

[0042] Put 13t of slag micropowder and 0.4t of triethanolamine into the mixing mill for 15 minutes of mixing and grinding, the mixing speed is 20 rpm, then gradually add about 5.4t of fly ash, continue mixing and grinding for 45 minutes, during which the 15th Take samples every minute for fast CaO determination, monitor the ratio of slag fine powder and fly ash to reach the target value, start to gradually add about 1.2t of silica fume, continue to mix and grind for 1.5 hours, and take samples every 20 minutes for fast CaO 2 Measure and monitor the proportion of silica fume, slag powder and fly ash to reach the target value, analyze the particle size of the mixed abrasive ≤ 7μm, and the specific surface area ≥ 600m 2 / kg, meet the specifications of the finished product, and discharge the material to obtain 20t of Type II special admixture. Its performance test values ​​are shown in Table 1.

Embodiment 3

[0044] This example is an example of the actual engineering application of special admixtures for high-performance marine concrete. The special admixtures for type I and type II high-performance marine concrete prepared in Examples 1 and 2 were used for port engineering in Shanghai Prefabricated Component Factory. Casting of precast and cast-in-place beams.

[0045] The mix ratio and material performance test data of the concrete produced on site are shown in Table 5 below (concrete design strength grade C45):

[0046]

Numbering

Material consumption per cubic meter of concrete (kg / m 3 )

**

slump

Spend

(mm)

Compressive strength

(MPa)

Resistance to chloride ion penetration

water

cement

Special Admixture

the sand

stone

polycarboxylate

Efficient water reduction system

3d

28d

NEL method

(1E10-

12m ...

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PUM

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Abstract

The admixture specially for high-performance marine concrete is produced with mine refuse powder, flyash, silica powder and other industrial active additives in certain proportion and through mixing,grinding and other steps based on the interactive superposing theory of polynary gelatinizing material. It has physical and chemical performance comparative or higher than single admixture mine refuse powder, makes concrete higher in placeability and durability, easy to use and low in production cost and use cost.

Description

technical field [0001] The invention relates to concrete, in particular to a special admixture in high-performance marine concrete, which is used to improve the workability and durability of marine concrete, thereby improving the durability of concrete structures in marine environments. Background technique [0002] Modern cement-based concrete materials have been used in marine engineering for more than 100 years. It can be traced back to 1849 when Portland cement concrete was used in marine engineering. However, due to the inherent characteristics of the traditional ordinary concrete based on Portland cement, in the application of marine engineering, it is found that such concrete structures are subjected to various natural factors such as freezing, wind and waves, and water quality in the marine environment. It is easy to damage the concrete and shorten its durability. In particular, in the large-scale construction of ocean engineering in western developed countries sinc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B40/00
CPCC04B40/0039C04B2111/74Y02W30/91C04B14/06C04B18/08C04B18/12C04B22/00C04B24/12C04B24/16
Inventor 徐强俞海勇
Owner SHANGHAI RES INST OF BUILDING SCI CO LTD