High-fluidity concrete and preparation method thereof

A high-fluidity, concrete technology, applied in the field of concrete, special concrete, high-fluidity concrete and its preparation, can solve the problems of difficulty in meeting the fluidity and self-compacting requirements of steel shell immersed tubes, and achieve excellent overall fluidity, The effect of high concrete strength and excellent fluidity

Active Publication Date: 2018-01-05
CCCC FOURTH HARBOR ENG INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing ordinary concrete is difficult to meet the fluidity and self-compacting requirements of steel shell immersed tube construction, and there is an urgent need for a high fluidity concrete and its production and implementation method

Method used

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  • High-fluidity concrete and preparation method thereof
  • High-fluidity concrete and preparation method thereof
  • High-fluidity concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Formulating High Fluid Concrete

[0067] Concrete takes raw materials according to the following ratio per cubic meter:

[0068] Gravel 765.9kg / m 3 ; (The apparent density of gravel is 2700kg / m 3 )

[0069] River sand 863.6kg / m 3 ; (the apparent density of the river sand is 2640kg / m 3 , sand rate 53%)

[0070] Cement 286kg / m 3 ; (the cement apparent density is 3140kg / m 3 )

[0071] Fly ash 156kg / m 3 ; (the apparent density of fly ash is 2240kg / m 3 )

[0072] Mineral powder 78kg / m 3 ; (the apparent density of mineral powder is 2900kg / m 3 )

[0073] Water 171.6kg / m 3 ;

[0074] Admixture 5.2kg / m 3 , of which tackifier accounts for 8.0%, and the rest is water reducing agent.

[0075] Stir and mix evenly to obtain high fluidity concrete.

[0076] Table 1 High fluidity mix ratio

[0077]

[0078] Table 2 Workability of high fluidity concrete

[0079]

[0080]

[0081] Table 3 Other Properties of High Fluidity Concrete

[0082]

[0083] Acco...

Embodiment 2

[0093] Concrete preparation: the volume ratio of water to powder is 0.83~0.97, and the amount of cementitious material is 520kg / m 3 , the cementitious material volume ratio is 48.5% cement + 37.1% fly ash + 14.4% mineral powder, the sand rate is 52% to 54%, the water-cement ratio is 0.30 to 0.35, and the amount of admixture is 0.8% to 1.2% (0.8% in admixture % is a tackifier). Prepare concrete to test its working performance (T 500 Expansion reached time, V-shaped funnel outflow time), water-powder volume ratio to T of high fluidity concrete 500 The degree of expansion has a significant effect, with results such as figure 1 As shown, as the water-powder volume ratio increases, T 500 The time decreases rapidly, the flow velocity increases, the fluidity increases, and the water-powder volume ratio increases to 0.89, T 500 The time drops below 5s.

[0094] The water-powder volume ratio has a significant effect on the outflow time of the V-shaped funnel of high-fluidity concr...

Embodiment 3

[0097] Concrete preparation: water-binder ratio 0.33, cementitious material dosage 520kg / m 3 , the cementitious material is 48.5% cement + 37.1% fly ash + 14.4% mineral powder by volume, and the unit volume of coarse aggregate is 0.26-0.33m 3 / m 3 , Admixture 0.9 ~ 1.1% (0.8% of admixture is tackifier).

[0098] The regular influence of the unit volume of coarse aggregate on the workability of high-flow concrete is mainly reflected in the package of concrete and the filling height of U-shaped instrument. The influence of the unit volume of coarse aggregate on the filling height of the U-shaped instrument is as follows: image 3 shown. As the unit volume of coarse aggregate decreases, the filling height of the U-shaped instrument gradually increases, and the concrete filling performance, segregation resistance and gap passability increase. When the unit volume of coarse aggregate decreases to 0.29m 3 / m 3 , the filling height rises to 331mm, and the filling height differen...

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Abstract

The invention relates to high-fluidity concrete. The high-fluidity concrete is prepared from coarse aggregates, fine aggregates, powder materials, additives and water, wherein the powder materials comprise cement, coal ash and mineral powder; the additives comprise a water reducing agent and a thickening agent; the usage amount of the coarse aggregates is 0.275 m<3> / m<3>-0.300 m<3> / m<3> in a unitabsolute volume ratio, the water consumption is 166.4 kg / m<3>-176.8 kg / m<3>, the water powder ratio is 0.83-0.97, the consumption of the powder materials is 510 kg / m<3>-540 kg / m<3>, the sand ratio is53-55%, and the mixing amount of the additives accounts for 0.95-1.1% of the consumption of the powder materials by weight. The performance index requirements for the high-fluidity concrete for filling a steel-shell immersed tube compartment are determined according to a concrete pouring construction technology of the steel-shell immersed tube compartment, and a high-fluidity concrete proportioning construction method for being suitable for a steel-shell immersed tube is formed through the research on the rules that the fluidity, the strength, the hydration heat and the shinkage of the concrete are affected by the change of various compositions.

Description

technical field [0001] The present invention relates to a kind of special concrete, especially a kind of high-fluidity concrete and its preparation method, especially relates to a kind of concrete poured by pumping technology, without vibration, formed by its own fluidity, suitable for the filling of steel shell immersed tube compartment , Concrete with good filling, gap passing and segregation resistance, high strength, low heat of hydration and low shrinkage. The invention belongs to the field of construction. Background technique [0002] Immersed tube tunnels can be divided into reinforced concrete immersed tubes and steel shell immersed tubes according to the material of the tube body. The former is widely used in Europe, South Korea and my country, while the latter is only used in Japan. The steel shell immersed tube is significantly different from the reinforced concrete immersed tube structure currently used in China, both in appearance and internality. [0003] As...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
Inventor 林鸣尹海卿张宝兰李超胡文刚许晓华唐光平李建业朱钊浩
Owner CCCC FOURTH HARBOR ENG INST
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