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Method for strengthening carbonation resistance of alkali-activated concrete

A technology of concrete and alkali excitation, applied in the field of enhancing the anti-carbonation ability of alkali-excited concrete, can solve the problems of reducing the compressive strength of alkali-excited concrete, affecting the durability of concrete, destroying the passivation film of steel bars, etc., and achieving significant environmental and social benefits. , Improve the anti-carbonization ability and avoid the effect of decomposition

Inactive Publication Date: 2019-03-08
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

The reduction of alkalinity will lead to the destruction of the passivation film of the steel reinforcement inside the alkali-induced concrete, accelerate the corrosion of the steel reinforcement, cause the decline of the bearing capacity, and seriously affect the durability of the alkali-induced concrete.
At the same time, the decalcification reaction of the polymer product will induce the destruction of the polymer product, resulting in a decrease in the compressive strength of the alkali-induced concrete.

Method used

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  • Method for strengthening carbonation resistance of alkali-activated concrete

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Embodiment 1

[0022] Embodiment 1: a kind of method that strengthens the anti-carbonation ability of alkali activated concrete, it is characterized in that: raw material composition and mass percentage thereof are as follows: take slag alkali activated concrete as example, cementitious material is blast furnace granulated slag micropowder 95% (dosage 313.5kg / m 3 ); ground slaked lime powder 5% (dosage 16.5kg / m 3 ); the fine aggregate is medium-coarse sand (dosage 651kg / m 3 ); the coarse aggregate is gravel (amount of 1056kg / m 3 ); liquid sodium silicate with a modulus of 2.75 (amount of 88 kg / m 3 ); caustic soda (NaOH dosage 17.6kg / m 3 ); water (dosage 92.4kg / m 3 ); with this as the control group, the accelerated carbonation test was carried out with reference to the standard GB / T 50082-2009 test method for long-term performance and durability of ordinary concrete. The carbonation test conditions were: CO 2 The mass fraction is 20%, the temperature is 20±2°C, and the humidity is 70±5%....

Embodiment 2

[0023] Embodiment 2: a kind of method that strengthens the anti-carbonation ability of alkali activated concrete, it is characterized in that: raw material composition and mass percentage thereof are as follows: take slag alkali activated concrete as example, cementitious material is blast furnace granulated slag micropowder 90% (dosage 300kg / m 3 ); ground slaked lime powder 5% (dosage 16.5kg / m 3 ); P.O 42.5 ordinary portland cement 5% (dosage 16.5kg / m 3 ); the fine aggregate is medium-coarse sand (dosage 651kg / m 3 ); the coarse aggregate is gravel (amount of 1056kg / m 3 ); liquid sodium silicate with a modulus of 2.75 (dosage 83.6kg / m 3 ); caustic soda (NaOH content 16.7kg / m 3 ); water (amount 106.9kg / m 3 );

Embodiment 3

[0024] Embodiment 3: a kind of method for enhancing the anti-carbonation ability of alkali-activated concrete is characterized in that: raw material composition and mass percentage thereof are as follows: taking slag alkali-activated concrete as example, cementitious material is blast furnace granulated slag micropowder 75% (dosage 247.5kg / m 3 ); ground slaked lime powder 5% (dosage 70.4kg / m 3 ); P.O 42.5 ordinary portland cement 20% (dosage 66kg / m 3 ); the fine aggregate is medium-coarse sand (dosage 651kg / m 3 ); the coarse aggregate is gravel (amount of 1056kg / m 3 ); liquid sodium silicate with a modulus of 2.75 (dosage 83.6kg / m 3 ); caustic soda (NaOH content 14.1 kg / m 3 ); water (dosage 96kg / m 3 );

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Abstract

The invention discloses a method for strengthening carbonation resistance of alkali-activated concrete, and belongs to a method for improving carbonation resistance of alkali-activated concrete. According to the method, when the alkali-activated concrete is prepared, 5% to 30% (a mass ratio of a binding material) of P.O42.5-level ordinary Portland cement is doped, a hydration reaction occurs on the cement, and a great deal of Ca(OH)2 is generated inside the alkali-activated concrete, so that the content of a carbonation resistance substance is promoted obviously, the carbonation resistance isimproved obviously, and the durability of the alkali-activated concrete is strengthened. Moreover, the promotion of carbonation resistance can prevent carbonization reaction-caused compressive strength sudden drop of the alkali-activated concrete, so as to guarantee that the alkali-activated concrete still has the advantage of high strength. Therefore, a Ca(OH)2 internal-generation method eliminates the influence that the carbonization resistance of the alkali-activated concrete is deficient, the application of the alkali-activated concrete in the engineering is realized, the alkali-activatedconcrete is used for replacing cement concrete, the problem of environmental pollution caused by bulk deposition of industrial solid wastes can be eliminated, excessive dependence on the Portland cement also can be relieved, excessive consumption for non-renewable resources is reduced, and the method is significant for our country which lacks energy sources and is relatively serious in environmental pollution.

Description

technical field [0001] A method for enhancing the anti-carbonation ability of alkali-activated concrete Background technique [0002] Alkali-activated concrete is a new type of concrete material developed in recent years. Because it is superior to cement concrete in many properties, alkali-activated concrete has become a hot research topic at home and abroad. Alkali-activated concrete mostly uses industrial solid waste containing silicate or aluminosilicate minerals as the main raw material, is fully mixed with other mineral admixtures and an appropriate amount of alkali-silicate solution, and is cured at room temperature or under autoclaved conditions. It is a type of material bonded by aluminosilicate gelling components. Compared with cement concrete, alkali-activated concrete not only has the characteristics of early strength and high strength (the compressive strength can reach 40MPa after 3 days of curing, and can reach 70MPa after 28 days of curing), but also has alka...

Claims

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Application Information

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IPC IPC(8): C04B28/26C04B111/22
CPCC04B28/26C04B2111/22C04B18/141C04B22/064C04B7/02C04B14/06C04B18/12C04B22/062C04B18/08C04B18/0409C04B14/106C04B18/06
Inventor 黄国栋
Owner ANHUI UNIV OF SCI & TECH
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