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Nanometer reinforcing method of completely-regenerative concrete aggregate

A technology of recycled concrete and recycled aggregates, which is applied in the direction of sustainable waste treatment, solid waste management, and climate sustainability. Time, increase strength and durability, and strong permeability effect

Inactive Publication Date: 2011-05-18
浙江华威建材集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the recycled aggregate obtained by these methods is applied to concrete, there are more or less defects in different aspects such as work performance, mechanical performance, durability, operability and production cost, and the effect is limited, which is not conducive to wide application, let alone realize Total Recycling of Concrete Aggregate

Method used

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  • Nanometer reinforcing method of completely-regenerative concrete aggregate
  • Nanometer reinforcing method of completely-regenerative concrete aggregate
  • Nanometer reinforcing method of completely-regenerative concrete aggregate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0010] The materials used are listed in Table 1 below.

[0011] Table 1. Examples 1-3 experimental materials

[0012]

[0013] The concrete mix ratio of each embodiment is shown in Table 2. Before mixing concrete, first use nano-calcium carbonate solution, dispersant and water to prepare solutions with nano-calcium carbonate concentrations of 3%, 5%, 10%, and dispersant content of 1%, and then soak the recycled aggregate in the solution for 45 minutes. Afterwards, the recycled aggregate is taken out to make its surface wet (the moisture content of the aggregate at this time is determined to be 9.12%, 9.58%, and 9.72%), and it is stirred with part of the cementitious material for 20-30 seconds, and then sand and remaining glue are added. coagulant and high-efficiency water reducer, and then stirred for 20 to 30 seconds, then added water and stirred for 2 minutes to obtain the fully recycled concrete. Among them, the amount of fly ash is 15%, and the amount of water reducer...

Embodiment 4～6

[0017] The materials used are shown in Table 3 below.

[0018] Table 3. Embodiment 4~6 experimental material

[0019]

[0020]

[0021] The concrete mix ratio of each embodiment is shown in Table 4. Before mixing concrete, first use nano-calcium carbonate solution, dispersant and water to prepare a solution with a concentration of nano-calcium carbonate of 5% and a dispersant content of 1%, and then soak the recycled aggregate in the solution for 30min, 45min, and 60min respectively, and then Take out the recycled aggregate to make its surface wet (the moisture content of the aggregate is 8.62%, 9.58%, and 9.60% at this time, respectively), and stir with part of the cementitious material for 20-30 seconds, then add sand and the remaining gelatinized materials and high-efficiency water reducer, and then stirred for 20 to 30 seconds, then added water and stirred for 2 minutes to obtain the fully recycled concrete. Among them, the amount of mineral powder is 15%, and the ...

Embodiment 7～10

[0026] The materials used are shown in Table 5 below.

[0027] Table 5. Embodiment 7~10 experimental materials

[0028]

[0029] The concrete mix ratio of each embodiment is shown in Table 6. Before mixing concrete, first use nano-calcium carbonate solution, dispersant and water to prepare a solution with a concentration of nano-calcium carbonate of 5% and a dispersant content of 1%, and then soak the recycled aggregate in the solution for 45 minutes, and then the recycled aggregate Take it out to make its surface wet (the moisture content of the aggregates at this time is determined to be 9.58%), stir with part of the cementitious material for 20 to 30 seconds, then add sand, remaining cementitious material and high-efficiency water reducer, and stir for another 20 seconds. ~30s, then add water and stir for 2 minutes to obtain the fully recycled concrete. Among them, the dosage of water reducer is 1%. Under standard curing conditions, the relevant data such as its mecha...

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Abstract

A nanometer reinforcing method belongs to the technical field of multipurpose use of building wastes and manufacture of building materials. The nanometer reinforcing method of completely-regenerative concrete aggregate mainly comprises the steps of: immersing regenerative coarse aggregate in a nanometer calcium carbonate solution for 30-60 minutes to perform aggregate reinforcement; and mixing the concrete by completely replacing the natural coarse aggregate with the reinforced aggregate. The reinforcing method which combines a reinforcing process with a mixing process effectively reduces procedures and cost, saves time and is suitable for engineering application. The nanometer reinforcing method of completely-regenerative concrete aggregate is mainly characterized in that: the mixing process is changed and nanoparticles are introduced; the micro-fissure and open pores of the regenerative aggregate are filled up with nanometer materials due to the fine particles and high penetrability , thus the strength of the regenerative aggregate is improved; and an interfacial strength between the regenerative aggregate and cement stone is improved and strengthened by a secondary mixing process and the introduction of the nanoparticles, so that the strength and the durability of the completely-regenerative aggregate concrete are improved under the condition of no change of peaceability. The 3-day strength of the completely-regenerative concrete aggregate can be improved by about 30% and the 28-day strength of the completely-regenerative concrete aggregate can be improved by about 20%.

Description

technical field [0001] The invention relates to a nano-strengthening method for fully recycled concrete aggregate, and belongs to the technical field of comprehensive utilization of construction waste and production of building materials. Background technique [0002] Driven by the rapid economic growth, my country's construction market is unprecedentedly prosperous. However, a large amount of construction waste is produced in the process of construction and demolition of old buildings. In order to achieve the goal of sustainable development, the recycling of construction waste has become a beneficial idea and means, and the country also attaches great importance to this. As early as 1997, the Ministry of Construction had listed "Comprehensive Utilization of Construction Waste Residue" as a key promotion project of scientific and technological achievements. In the "Eleventh Five-Year" Science and Technology Support Plan, the research topic of recycling construction waste is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B18/16
CPCY02W30/91
Inventor 王章夫周堂贵郑应生凌金钱晓倩詹树林钱匡亮孟涛张津践赖俊英方明晖
Owner 浙江华威建材集团有限公司
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