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Method for activating construction waste regenerated micro-powder

A technology for regenerating micropowder and construction waste, applied in cement production, sustainable waste treatment, solid waste management, etc., can solve problems such as incomplete hydration, and achieve the effect of improving performance

Inactive Publication Date: 2012-12-26
NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Construction waste regenerated micropowder particles contain a large amount of hardened cement paste. According to the knowledge of cement chemistry, this part of cement paste is not completely hydrated, and there is a possibility of rehydration when it encounters water. Therefore, it can be considered to use construction waste regenerated micropowder It is used in the production of "performance-adjusting auxiliary cementitious materials", and its rehydration activity is necessarily related to the hydration maturity of waste concrete; secondly, there must be Ca(OH) in hydrated cement 2 , can be used as an alkaline activator to play a positive role in the strength of traditional mineral admixtures such as fly ash. At the same time, there are a large amount of recycled brick and tile powder in the recycled micro-powder of construction waste. How to activate the activity of the above-mentioned micro-powder to the greatest extent at present, To make it fully utilized, there are no domestic and foreign reports on the research and utilization of this aspect.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 88wt% recycled micropowder of construction waste below 0.36mm is mechanically mixed with 12wt% lime until the fineness is less than 0.075mm, then soaked in a saturated sodium aluminosilicate solution for 24 hours, then heated to 950°C, kept for 3 hours, and then cooled to room temperature. Then it is mixed with slag powder at room temperature in a 1:1 manner until the specific surface area is greater than 450mm 2 / kg.

[0015] This product can be a new type of concrete active admixture. Activity index greater than 95%;

[0016] Prepare samples for the present embodiment without doping and doping below, and the performance comparison of the resulting product:

[0017] Take 450 grams of PO.42.5 cement, 1350 grams of standard sand, and 225 grams of water for molding;

[0018] 3-day strength 26Mpa, 28-day strength 49Mpa;

[0019] Take 225 grams of PO.42.5 cement, 225 grams of this product, 1350 grams of standard sand, and 225 grams of water for molding;

[0020] 3-day ...

Embodiment 2

[0023] 85wt% recycled micropowder of construction waste below 0.36mm is mechanically mixed with 15wt% lime until the fineness is less than 0.075mm, then soaked in a saturated solution of sodium aluminosilicate for 24 hours, then heated to 950°C, kept for 3 hours, and then cooled to room temperature. Then it is mixed with slag powder at room temperature in a 1:1.1 manner until the fineness is greater than 450mm 2 / kg.

[0024] This product can be a new type of concrete active admixture. Activity index greater than 98%;

[0025] Prepare samples for the present embodiment without doping and doping below, and the performance comparison of the resulting product:

[0026] Take 450 grams of PO.42.5 cement, 1350 grams of standard sand, and 225 grams of water for molding;

[0027] 3-day strength 26Mpa, 28-day strength 49Mpa;

[0028] Take 225 grams of PO.42.5 cement, 225 grams of this product, 1350 grams of standard sand, and 225 grams of water for molding;

[0029] 3-day strength...

Embodiment 3

[0032] The regenerated micropowder of construction waste below 0.36mm is mechanically mixed with 10% lime to a fineness of less than 0.075mm, then soaked in a saturated solution of sodium aluminosilicate for 24 hours, then heated to 900°C, kept for 3 hours, and then cooled to room temperature. Then it is mixed with slag powder at room temperature in a ratio of 1:0.8 until the fineness is greater than 450mm 2 / kg.

[0033] This product can be a new type of concrete active admixture. Activity index greater than 90%;

[0034] Prepare samples for the present embodiment without doping and doping below, and the performance comparison of the resulting product:

[0035] Take 450 grams of PO.42.5 cement, 1350 grams of standard sand, and 225 grams of water for molding;

[0036] 3-day strength 26Mpa, 28-day strength 49Mpa;

[0037] Take 225 grams of PO.42.5 cement, 225 grams of this product, 1350 grams of standard sand, and 225 grams of water for molding;

[0038] 3-day strength 19....

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Abstract

The invention discloses a method for activating construction waste regenerated micro-powder. The method comprises the following detailed steps of: firstly, subjecting the construction waste regenerated micro-powder with the particle size of less than 0.36mm and lime to an activation treatment, namely, mechanically milling and mixing, and milling at normal temperature till obtaining a powder material with powder fineness less than 0.075mm, wherein the lime doping amount is 5-15% of the total weight of the mixture, and the balance is construction waste regenerated micro-powder; immersing the mechanically activated powder material in a sodium silicoaluminate solution for 18-30h, drying in the air, heating to 900-950 DEG C, holding the temperature for 2-5h, and then naturally cooling to room temperature; mixing and milling the cooled material with slag micro-powder according to the weight ratio of 1:(0.8-1.5) at normal temperature until the specific surface area of the mixed material is more than 450mm<2> / kg. With the adoption of the method, the construction waste regenerated micro-powder with the particle size of less than 0.36mm can be recycled completely, and the activity is high.

Description

technical field [0001] The invention relates to the technical field of concrete materials, in particular to a method for activating recycled fine powder of construction waste. Background technique [0002] Recycling of construction waste, the main technical approach is to use construction waste to prepare recycled aggregate and recycled fine powder, recycled aggregate is used to prepare recycled concrete and road cushions and bases, recycled fine powder is used as filler or active admixture for In the preparation of concrete, in the resource production process of construction waste, about 35% of the particles belong to recycled aggregates with a particle size greater than 0.36mm. At present, research on this part is relatively in-depth at home and abroad, and recycled coarse aggregates have been used to prepare recycled aggregates. Local standards for recycled aggregates for concrete and subgrade cushions were promulgated. However, in order to realize the complete recycling...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24C04B18/16
CPCY02P40/10Y02W30/91
Inventor 孙家瑛
Owner NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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