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A method of strengthening the quality of recycled coarse aggregate by using strong acid in three stages

A recycled coarse aggregate, three-stage technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of high purchase cost of admixtures, reduced concrete strength, high porosity, etc., to achieve a huge social Benefits and environmental benefits, reduced water absorption, improved anti-carbonation performance

Active Publication Date: 2021-12-17
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since a large amount of old mortar adheres to the surface of recycled coarse aggregate, resulting in high porosity and high water absorption, it will reduce the strength of concrete
At present, domestic researchers mostly use external materials of different properties (such as fly ash, silica fume, cement, mortar, nanomaterials, etc.) to impregnate, rinse, and dry recycled aggregates. It has the characteristics of cementation and covers the surface of recycled concrete. However, the above methods strengthen the recycled aggregate only on the surface, and have little impact on the internal structure, and the purchase cost of most admixtures is relatively high.

Method used

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  • A method of strengthening the quality of recycled coarse aggregate by using strong acid in three stages
  • A method of strengthening the quality of recycled coarse aggregate by using strong acid in three stages

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A method of strengthening the quality of regenerated binding materials using strong acids, and implemented as follows:

[0036] Step 1, placed the regenerated coarse aggregate in a concentration of 0.05 mol / L hydrochloric acid solution and soaked for 1 day, wherein the granular grade of the regenerated crude aggregate is 5 mm to 30 mm; the pH of the soaking solution is tested every two hours. If the pH of the soaking solution is not 1.3, the addition concentration is 0.05 mol / L sulfuric acid solution to adjust the soaking solution to the pH of 1.3;

[0037] Step 2, adding a concentration of 0.05 mol / l nitric acid solution to the hydrochloric acid solution after a period of time, then soaking 1 day, then remove the regenerated coarse aggregate; test the pH of the soaking solution every two hours, if the solution is soaked The pH is not 1.3, then the concentration is 0.05 mol / L sulfuric acid solution to adjust the soaking solution to pH of 1.3;

[0038] Step 3, put th...

Embodiment 2

[0043] A method of strengthening the quality of regenerated binding materials using strong acids, and implemented as follows:

[0044] Step 1, placed the regenerated coarse aggregate in a concentration of 0.1 mol / L hydrochloric acid solution and soaked for 1 day, wherein the grain level of the regenerated coarse aggregate is 5 mm to 30 mm; the pH of the soaking solution is tested every two hours. If the pH of the soaking solution is not 1.0, the addition concentration of 0.05 mol / l ~ 0.20 mol / L sulfuric acid solution is adjusted to the pH of 1.0;

[0045] Step 2, adding a concentration of 0.05 mol / l to 0.20 mol / L nitric acid solution to the step 1, and then soaked in 1 day, then the regenerated coarse aggregate is taken after 1 day; the pH of the soaking solution is tested every two hours. If the pH of the soaking solution is not 1.0, the addition concentration is 0.1 mol / L sulfuric acid solution to adjust the soaking solution to pH of 1.0;

[0046] Step 3, put the reg...

Embodiment 3

[0051] A method of strengthening the quality of regenerated binding materials using strong acids, and implemented as follows:

[0052] Step 1, the regenerated coarse material is placed in a concentration of 0.15 mol / L hydrochloric acid solution and soaked for 1 day to 5 days, wherein the grain level of the regenerated coarse aggregate is 5mm to 30 mm; test a soaking solution every two hours. If the pH of the soaking solution is not 0.83, the addition concentration is 0.15 mol / L sulfuric acid solution to adjust the soaking solution to pH is 0.83;

[0053] Step 2, adding a concentration of 0.15 mol / l nitric acid solution to the step 1, and then soaked in 1 day, then remove the regenerated coarse aggregate; test the pH of the soaking solution every two hours, if the solution is soaked If the pH is not 0.83, the addition concentration is 0.15 mol / L sulfuric acid solution to adjust the soaking solution to pH is 0.83;

[0054] Step 3, put the regenerative crude material taken in...

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Abstract

The invention discloses a method for strengthening the quality of regenerated coarse aggregate by using strong acid in three stages, specifically: firstly, placing the regenerated coarse aggregate in hydrochloric acid solution and soaking for a period of time; secondly, adding nitric acid to the hydrochloric acid solution after soaking for a period of time Solution, after soaking for a period of time, take out the regenerated coarse aggregate; then put the taken out coarse aggregate into clean water and wash it several times until the clean water is neutral, then take out the coarse aggregate; then put the taken out regenerated coarse aggregate into sulfuric acid solution After soaking for a period of time, take out the regenerated coarse aggregate; finally put the taken out regenerated coarse aggregate into clean water and wash it several times until the clean water is neutral, then take it out to get the strengthened regenerated coarse aggregate. This method uses a strong acid solution to soak the regenerated coarse aggregate, first corrodes the mortar attached to the surface and inside, and then uses sulfuric acid to react with the residual calcium ions to form a dense layer to improve its apparent density and water absorption, and strengthen the regenerated aggregate. The use performance has reached the standard of engineering application specifications.

Description

Technical field [0001] The present invention belongs to the technical field of regenerative building waste performance, and is related to a method of regenerating and regenerating the quality of regenerated binds with strong acid. Background technique [0002] In the rapid development of the construction industry, the demand for natural gravel aggregates is increasing, and the production of natural sandstone aggregates requires excavation of a large number of mountains, which inevitably cause great damage to the environment, and the current natural sand resources It is also close to the exhaustion. In addition, my country has produced a large number of construction waste in urbanization, earthquake, landslide and other natural disasters and demolition projects. These construction waste is complicated, of which 41% are abandoned concrete, and their proportion is great. The open-air construction waste can be seen everywhere, not only wasted land space, but also caused serious damag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/02C04B18/16
CPCC04B20/023C04B18/16Y02W30/91
Inventor 李阳王瑞骏张旭李炎隆覃源
Owner XIAN UNIV OF TECH