A kind of high-strength and low-shrinkage air-entrained concrete and its preparation method

An air-entrained concrete and low-shrinkage technology, which is applied in the field of air-entrained concrete, can solve the problems of low production efficiency, high water absorption, and large shrinkage, and achieve the effects of improving production efficiency, shortening time, reducing water absorption and drying shrinkage

Active Publication Date: 2021-11-02
重庆中科建筑科技(集团)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the above-mentioned prior art, the technical problem to be solved by the present invention is: the present invention provides a high-strength and low-shrinkage aerated concrete, which solves the problems of low strength, large shrinkage, and water absorption of ordinary aerated concrete products on the market. The problem of high rate and high cost
[0005] The invention also provides a method for preparing high-strength and low-shrinkage aerated concrete, which solves the problems of low production efficiency, high cost and large energy consumption in the existing preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A B04 grade lightweight sand aerated concrete is prepared by the following steps:

[0030] S1: Use a 500ml measuring cylinder to measure 150ml of industrial ethanol and pour it into a 1000ml four-neck flask, slowly add 50ml of stearic acid dropwise into the flask, and stir until the stearic acid is completely dissolved in the industrial ethanol, then Add 300ml of 2.5mol / L calcium chloride solution to the mixed solution, stir evenly, add 300ml of 2.5mol / L sodium carbonate solution to the aforementioned mixed solution, and carry out the polymerization reaction for 2~3h to obtain nano-carbonic acid salt crystals, then add 20ml of 1mol / L TiC solution into the four-necked flask, place it at 60-70°C for 6-8h, after the reaction is complete, slowly cool down to room temperature for 1-2h, and stir at 3000-5000rpm for 1 ~2min, the modified nano-calcium carbonate gel solution with a solid content of 47.5% and a nanoparticle size of 65.4nm is obtained for subsequent use;

[0031]...

Embodiment 2

[0037] A B05 grade lightweight sand aerated concrete is prepared by the following steps:

[0038] S1: Use a 500ml graduated cylinder to measure 150ml of trimethylolpropane and pour it into a 1000ml four-neck flask, slowly add 80ml of palmitic acid dropwise into the flask, and stir until the stearic acid is completely dissolved in industrial ethanol , then add 350ml of 2.5mol / L magnesium chloride solution to the mixed solution, stir evenly, add 320ml of 2.5mol / L sodium carbonate solution to the aforementioned mixed solution, and carry out the polymerization reaction for 2~3h to obtain nano-carbonic acid salt crystals, then add 25ml of 1mol / L TaC solution into the four-necked flask, place it at 60-70°C for 6-8h, and after the reaction is complete, cool slowly for 1-2h to room temperature, and stir at 3000-5000rpm for 1~ 2min, promptly obtain the modified nano-magnesium carbonate gel solution that solid content is 48.2% and nanoparticle particle diameter is 75nm, for subsequent u...

Embodiment 3

[0045] A B06 grade lightweight sand aerated concrete is prepared by the following steps:

[0046] S1: Measure 150ml of ethylene glycol with a 500ml measuring cylinder and pour it into a 1000ml four-neck flask, slowly add 60ml of linolenic acid dropwise into the flask, and stir while adding until the stearic acid is completely dissolved in industrial ethanol, then Add 320ml of 2.5mol / L lithium chloride solution to the mixed solution, stir evenly, add 350ml of 2.5mol / L sodium carbonate solution to the aforementioned mixed solution, and carry out the polymerization reaction for 2~3h to obtain nano-carbonic acid Salt crystals, then add 30ml of 1mol / L Cr in the four-necked flask 3 C 2 Solution, placed at 60-70°C for 6-8 hours, after the reaction was complete, slowly cooled for 1-2 hours to room temperature, and stirred at 3000-5000rpm for 1-2 minutes to obtain a solid content of 46.8% and a particle size of 54.7nm The modified nano lithium carbonate gel solution;

[0047] S2: Ac...

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Abstract

The invention discloses a high-strength and low-shrinkage air-entrained concrete and a preparation method thereof, comprising the following components in parts by weight: 60-75 parts of siliceous material, 1-3 parts of gypsum, 22-39 parts of calcareous material, reinforcement 0.5-1.5 parts of fiber, 1-3 parts of modified nano-carbonate gel solution, 54-65 parts of water and 2-10 parts of additives. Through the synergistic compatibility of various raw materials, the thickening speed of the cement slurry and the early strength of the embryo body are effectively improved, the pore structure and porosity of the cement stone are improved, and the structure of the aerated concrete product is uniform and compact, which greatly improves the The compressive strength, anti-cracking ability and toughness of the product are improved; the water absorption and drying shrinkage value of the aerated concrete product are also reduced. The present invention can complete curing within 4-6 hours at room temperature, reducing energy consumption and shortening time. The production efficiency is improved, the preparation process is simple and easy, the industrial by-product is used as the main raw material, the cost is low, the large-scale industrial production is easy to realize, and the preparation has good application prospects.

Description

technical field [0001] The invention relates to the technical field of aerated concrete, in particular to a high-strength and low-shrinkage aerated concrete and a preparation method thereof. Background technique [0002] Air-entrained concrete is made of siliceous materials (sand, fly ash and silicon-containing tailings, etc.) and calcareous materials (lime, cement) as the main raw materials. , pre-curing, cutting, autoclaving, curing and other processes made of lightweight porous silicate products. Because it contains a large number of uniform and fine pores after being aerated, it is named aerated concrete. Aerated concrete has excellent thermal insulation performance. Using it to build self-insulation walls is not only convenient for construction, but also low in cost. It is a sustainable green building material that saves energy, soil, and waste. Its production energy consumption is low, Low building energy consumption, low heating energy consumption, is the wall mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/02C04B38/02
CPCC04B28/02C04B2201/20C04B2201/32C04B2201/50C04B14/28C04B24/085C04B22/124C04B22/10C04B14/322C04B14/06C04B18/08C04B18/142C04B22/143C04B22/064C04B18/0409C04B22/04C04B2103/302C04B20/0048C04B38/02C04B14/26C04B14/44C04B18/12C04B16/0641
Inventor 席菲菲刘耶霖李启林
Owner 重庆中科建筑科技(集团)有限公司
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