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Geopolymeric concrete based on recycled aggregate and preparation method of geopolymeric concrete

A technology of geopolymer and recycled aggregate, applied in the field of concrete

Inactive Publication Date: 2014-02-26
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The invention provides a recycled aggregate polymer concrete and its preparation method to solve various shortcomings and deficiencies in the prior art

Method used

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  • Geopolymeric concrete based on recycled aggregate and preparation method of geopolymeric concrete
  • Geopolymeric concrete based on recycled aggregate and preparation method of geopolymeric concrete

Examples

Experimental program
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preparation example Construction

[0027] The preparation method of the present invention based on recycled aggregate geopolymer concrete comprises the following process steps:

[0028] 1) Combine waste concrete with an amount of 40% to 70% (in which the content of coarse aggregate is not less than 60%, and the content of fine aggregate is not more than 40%) and fine sand (medium sand) with an amount of 20% to 40%. And the additives with a dosage of 0% to 5% are uniformly mixed in the mold to form a solid mixture for use;

[0029] 2) Mix 0.1%-1.5% water glass with 1%-15% alkali (one or more mixtures of sodium hydroxide, potassium hydroxide, lime, sodium carbonate) and water into an activator solution for use;

[0030] 3) Mix the mixture of metakaolin, fly ash and blast furnace slag or one of them with the activator solution at a dosage of 10% to 30%, stir for 5 to 20 minutes, mix with the solid mixture, stir for 10 to 30 minutes, and cure at room temperature made.

[0031] The prepared recycled aggregate geo...

example 1

[0033] Step 1. Classify the concrete waste, weigh 300g-600g of coarse aggregate (diameter 30-60mm), 200g-400g of fine aggregate (waste concrete ash), and 200g-400g of fine sand and mix evenly for use;

[0034] Step 2. Weigh 1g-3g sodium silicate, mix with 10g-30g sodium hydroxide, add 200ml water to make activator solution for use;

[0035] Step 3. Weigh 150g-300g of metakaolin (kaolin is calcined at 600°C, 650°C, 700°C, 750°C, 800°C for 2-5 hours);

[0036] Step 4: Add metakaolin to the activator solution, stir for 5-20 minutes, then mix it with the aggregate mixture, add 1000ml of water at the same time, stir for 10-30 minutes, cast it, and maintain it at room temperature. attached figure 1 It is the scanning electron microscope picture of the concrete surface obtained in this experiment.

example 2

[0038] Step 1. Classify the concrete waste, weigh 300g-600g of coarse aggregate (diameter 30-60mm), 200g-400g of fine aggregate (waste concrete ash), and 200g-400g of fine sand and mix evenly for use;

[0039] Step 2. Weigh 1g-3g sodium silicate, mix with 10g-30g sodium hydroxide, add 200ml water to make activator solution for use;

[0040] Step 3, weighing 200g to 500g of fly ash;

[0041] Step 4: Add fly ash into the activator solution, stir for 5-20 minutes, then mix with the aggregate mixture, add 1000ml of water at the same time, stir for 10-30 minutes, cast into a mold, and maintain at room temperature. attached figure 2 It is the scanning electron microscope picture of the concrete surface obtained in this experiment.

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Abstract

The invention relates to geopolymeric concrete based on recycled aggregate, and a preparation method of the geopolymeric concrete. The concrete is prepared by taking construction waste as aggregate and inorganic geopolymer as an adhesive through an alkali activation process. The recycled aggregate geopolymeric concrete prepared by using the method has the characteristics that the concrete can be rapidly dried, the compressive strength, particularly the early-stage compressive strength is high, the volume shrinkage in the coagulation process is extremely low, the coefficient of volume expansion is approximate to 0, and acid-base corrosion resistance is good. Due to the adoption of the method, the defects that the conventional concrete is low in early-stage strength and the coagulation time is long are overcome; a method for rapidly repairing concrete pavement is provided, and problems of recycling and reusing construction waste aggregate and environment problems caused by the construction waste aggregate are solved.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to concrete with construction waste as recycled aggregate and geopolymer as binder and a preparation method thereof. Background technique [0002] A large number of early bridges and buildings had to be demolished because they had reached the end of their service life or could not meet the demand, resulting in a large amount of waste concrete. In the past ten years, a lot of research has been done on the recycling of waste concrete. Replace waste concrete aggregates with natural aggregates to make new concrete to achieve the purpose of turning waste into treasure and reusing resources, so as to effectively protect natural resources, reduce the consumption of natural aggregates and energy, and effectively alleviate our current situation. Environmental threats faced (resource bottlenecks and environmental pollution, etc.). However, the utilization of waste concrete is now limited t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B28/08C04B18/16
CPCY02P40/10Y02W30/91
Inventor 张雄飞彭晖
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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