A functional carbon reduction aid for reducing the carbon emissions of concrete and its preparation method

Abstract

The present invention discloses a functional carbon reduction aid for reducing the carbon emissions of concrete and a preparation method thereof. The aid is made from the following raw materials in parts by weight: 10-40 parts of tetraethyl orthosilicate, 10-40 parts of tetracalcium ferroaluminate, 8-16 parts of water reducer, 5-20 parts of air-entraining agent, 5-20 parts of strengthening agent, and 20-50 parts of adhesive. The combined use of tetraethyl orthosilicate and tetracalcium ferroaluminate in the aid of the present invention can significantly enhance the mechanical properties of concrete prepared with manufactured sand as aggregate, and have synergistic effects; using sodium dodecylbenzenesulfonate and modified rosin powder as a composite air-entraining agent improves the slump of the concrete slurry; using modified epoxy resin and modified sodium silicate as a composite adhesive improves the static compressive elastic modulus of the concrete.

Description

Technical Field

[0001] The present invention belongs to the technical field of building material additives, and particularly relates to a functional carbon reduction additive for reducing the carbon emission of concrete and a preparation method thereof. Background Art

[0002] Concrete refers to a composite material in which aggregate is cemented into a whole by a cementitious material. Generally, cement is used as the cementitious material, sand and stone are used as the aggregate, and it is mixed with water (which may contain additives and admixtures) in a certain proportion and stirred to obtain. The significant global climate change has made the emission of greenhouse gases, especially carbon emission, a focus of wide attention. The cement industry is an important basic raw material industry supporting social and economic development, and at the same time, it is an industry with high energy consumption and high carbon emission. The comprehensive energy consumption for producing 1 ton of cement is about 113.5 kgce, and the emission is about 0.8 tons of CO 2 , accounting for 1 / 5 of the national industrial carbon emission. The cement industry will face huge challenges and pressures in sustainable development and low-carbon economy.

[0003] The stages of CO 2 emission in cement production are raw material treatment, raw meal preparation, fuel pretreatment, firing system, cement grinding, waste heat utilization and auxiliary production. Technical means such as improving the utilization of alternative raw fuels, efficient coal combustion technology and equipment, optimization of new dry process cement production lines, and efficient energy-saving grinding technology and equipment have made the space for further reducing CO 2 emission very small. Without reducing the performance of concrete, minimizing the amount of cement gel used is a new idea for reducing CO 2 emission.

[0004] In the process of concrete preparation, cement generally accounts for about 50% of the total dry material mass. Through additives, the usage amount can be reduced to 30%. If it is lower, the quality of concrete will be significantly reduced. The aggregate used in the process of concrete preparation is generally natural sand. However, as the natural sand resources are getting fewer and fewer, using manufactured sand to replace natural sand has become a trend in the concrete preparation industry. However, the manufactured sand particles are sharper than natural sand and contain different amounts of stone powder. Excessive or too little content of stone powder will affect the quality of concrete, and different additives need to be proportioned for optimization and modification. Summary of the Invention

[0005] The purpose of the present invention is to provide a functional carbon reduction additive for reducing the carbon emission of concrete and a preparation method thereof.

[0006] A functional carbon reduction additive for reducing the carbon emission of concrete is made from the following raw materials in parts by weight: 10 - 40 parts of tetraethyl orthosilicate, 10 - 40 parts of tetracalcium ferroaluminate, 8 - 16 parts of water reducer, 5 - 20 parts of air-entraining agent, 5 - 20 parts of strengthening agent, and 20 - 50 parts of adhesive.

[0007] The water reducing agent is one or more of polyethylene glycol, calcium lignosulfonate, and polycarboxylate water reducing agent.

[0008] The air entraining agent is a mixture of sodium dodecylbenzenesulfonate and modified rosin powder mixed in a mass ratio of 1:1.

[0009] The modified rosin powder is prepared as follows: Take 50 - 80 parts by weight of rosin powder and 10 - 30 parts by weight of sodium hydroxide and put them into a reaction kettle, add 30 - 60 parts by weight of water, mix and stir for 20 - 40 min, heat to 60 - 70 °C, and keep warm for 40 - 60 min; heat to 70 - 80 °C, add 1 - 5 parts by weight of tetrabutylammonium bromide and 20 - 40 parts by weight of tall oil, keep warm for 20 - 40 min; heat to 80 - 90 °C, add 5 - 15 parts by weight of petroleum sulfonate, keep warm for 20 - 40 min, and cool down to room temperature to make it.

[0010] The reinforcing agent is one or more of vanadium slag, white carbon black, calcium silicate whiskers, and basalt fiber.

[0011] The adhesive is a mixture of modified epoxy resin and modified water glass mixed in a mass ratio of 1:1.

[0012] The modified epoxy resin is prepared as follows: Take a mixture of 60 - 80 parts by weight of bisphenol A epoxy resin, 5 - 10 parts by weight of isophorone diisocyanate, and 5 - 10 parts by weight of polypropylene glycol and place it in a reaction vessel. Under nitrogen protection, heat it to 50 - 70 °C, add 1 - 3 parts by weight of dibutyltin dilaurate for the first esterification reaction, and the reaction time is 2 - 4 h. After adding the obtained first esterification reaction solution and 5 - 10 parts by weight of polypropylene glycol and mixing evenly, heat the system to 70 - 90 °C and carry out the second esterification reaction under nitrogen protection. Stop the reaction after 3 - 6 h to obtain the modified epoxy resin.

[0013] The modified water glass is prepared as follows: Take 3 - 8 parts by weight of aluminum nitrate and 3 - 15 parts by weight of trimethylethoxysilane, dissolve them in 30 - 50 parts by weight of absolute ethanol, then add them to 100 - 300 parts by weight of water glass. First, carry out ultrasonic oscillation for 10 - 15 min to make it mix evenly, and then stir at a water bath temperature of 40 - 60 °C for 10 - 30 min to make it.

[0014] The preparation method of the functional carbon reduction additive for reducing the carbon emission of concrete is as follows: Take 10 - 40 parts by weight of tetraethyl orthosilicate, 10 - 40 parts by weight of tetracalcium ferroaluminate, 8 - 16 parts by weight of water reducing agent, 5 - 20 parts by weight of air entraining agent, 5 - 20 parts by weight of reinforcing agent, and 20 - 50 parts by weight of adhesive, put them into a mixer and stir at 600 - 1200 rpm for 30 - 60 min to make it.

[0015] Application of the functional carbon-reducing aid for reducing concrete carbon emissions in the preparation of concrete with low cement dosage, wherein the cement dosage in the concrete with low cement dosage is 15-30% of the mass of solid materials.

[0016] Advantages of the present invention: The combined use of tetraethyl orthosilicate and tetracalcium ferroaluminate in the aid of the present invention can significantly enhance the mechanical properties of concrete prepared with manufactured sand as aggregate, and have synergistic effects; Using sodium dodecylbenzenesulfonate and modified rosin powder as a composite air-entraining agent improves the slump of the concrete slurry; Using modified epoxy resin and modified sodium silicate as a composite binder improves the static compressive elastic modulus of the concrete. Detailed implementation manners

[0017] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure content of the present invention more thorough and comprehensive.

[0018] Example 1

[0019] A functional carbon-reducing aid for reducing concrete carbon emissions is made from the following raw materials in parts by weight: 25 parts of tetraethyl orthosilicate, 25 parts of tetracalcium ferroaluminate, 10 parts of polyethylene glycol, 16 parts of air-entraining agent, 10 parts of vanadium slag, 30 parts of binder; The air-entraining agent is a mixture of sodium dodecylbenzenesulfonate and modified rosin powder mixed in a mass ratio of 1:1; The binder is a mixture of modified epoxy resin and modified sodium silicate mixed in a mass ratio of 1:1.

[0020] The modified rosin powder is prepared according to the following method: Take 60 parts of rosin powder and 20 parts of sodium hydroxide by weight and put them into a reaction kettle, add 45 parts of water, mix and stir for 30 min, heat to 65 °C, and keep warm for 50 min; Heat to 75 °C, add 3 parts of tetrabutylammonium bromide and 30 parts of tall oil, and keep warm for 30 min; Heat to 85 °C, add 10 parts of petroleum sulfonate, keep warm for 30 min, and cool to room temperature to make it.

[0021] The modified epoxy resin is prepared according to the following method: Take a mixture of 70 parts of bisphenol A epoxy resin, 8 parts of isophorone diisocyanate, and 8 parts of polypropylene glycol by weight and place it in a reaction vessel. Under nitrogen protection, heat it to 60 °C, add 2 parts of dibutyltin dilaurate for the first esterification reaction, and the reaction time is 3 h. After adding the obtained first esterification reaction solution and 8 parts of polypropylene glycol and mixing evenly, heat the system to 80 °C and carry out the second esterification reaction under nitrogen protection. Stop the reaction after 4 h to obtain the modified epoxy resin.

[0022] The modified sodium silicate is prepared as follows: By weight, take 6 parts of aluminum nitrate and 12 parts of trimethylethoxysilane, dissolve them in 40 parts of absolute ethanol, then add them to 200 parts of sodium silicate. First, perform ultrasonic oscillation for 12 min to make the mixture uniform, and then stir at a water bath temperature of 50 °C for 20 min to obtain the product.

[0023] The preparation method of the functional carbon reduction aid for reducing the carbon emission of concrete is as follows: By weight fraction, take 25 parts of tetraethyl orthosilicate, 25 parts of tetracalcium ferroaluminate, 10 parts of polyethylene glycol, 16 parts of air-entraining agent, 10 parts of vanadium slag, and 30 parts of binder, put them into a mixer and stir at 800 rpm for 40 min to obtain the product.

[0024] Example 2

[0025] A functional carbon reduction aid for reducing the carbon emission of concrete is made from the following raw materials by weight: 15 parts of tetraethyl orthosilicate, 15 parts of tetracalcium ferroaluminate, 8 parts of calcium lignosulfonate, 10 parts of air-entraining agent, 5 parts of white carbon black, 5 parts of calcium silicate whisker, and 25 parts of binder; the air-entraining agent is a mixture of sodium dodecylbenzenesulfonate and modified rosin powder in a mass ratio of 1:1; the binder is a mixture of modified epoxy resin and modified sodium silicate in a mass ratio of 1:1.

[0026] The modified rosin powder is prepared as follows: By weight, take 50 parts of rosin powder and 10 parts of sodium hydroxide, put them into a reaction kettle, add 30 parts of water, mix and stir for 20 min, heat to 60 °C and keep warm for 40 min; heat to 70 °C, add 2 parts of tetrabutylammonium bromide and 20 parts of tall oil, keep warm for 20 min; heat to 80 °C, add 5 parts of petroleum sulfonate, keep warm for 20 min, and then cool to room temperature to obtain the product.

[0027] The modified epoxy resin is prepared as follows: By weight, take a mixture of 60 parts of bisphenol A epoxy resin, 5 parts of isophorone diisocyanate, and 5 parts of polypropylene glycol and place it in a reaction vessel. Under nitrogen protection, heat it to 50 °C, add 1 part of dibutyltin dilaurate for the first esterification reaction, and the reaction time is 2 h. After adding 5 parts of polypropylene glycol to the obtained first esterification reaction solution and mixing evenly, heat the system to 70 °C and carry out the second esterification reaction under nitrogen protection. Stop the reaction after 3 h to obtain the modified epoxy resin.

[0028] The modified sodium silicate is prepared as follows: By weight, take 3 parts of aluminum nitrate and 5 parts of trimethylethoxysilane, dissolve them in 30 parts of absolute ethanol, then add them to 100 parts of sodium silicate. First, perform ultrasonic oscillation for 10 min to make the mixture uniform, and then stir at a water bath temperature of 40 °C for 10 min to obtain the product.

[0029] The preparation method of the functional carbon-reducing aid for reducing the carbon emission of concrete is as follows: by weight fraction, take 15 parts of tetraethyl orthosilicate, 15 parts of tetracalcium aluminoferrite, 8 parts of calcium lignosulfonate, 10 parts of air-entraining agent, 5 parts of white carbon black, 5 parts of calcium silicate whisker, and 25 parts of adhesive, put them into a blender and stir for 60 minutes under the condition of 600 rpm to make it.

[0030] Example 3

[0031] A functional carbon-reducing aid for reducing the carbon emission of concrete is made from the following raw materials by weight: 40 parts of tetraethyl orthosilicate, 40 parts of tetracalcium aluminoferrite, 16 parts of polycarboxylate superplasticizer, 20 parts of air-entraining agent, 20 parts of basalt fiber, and 50 parts of adhesive; the air-entraining agent is a mixture of sodium dodecylbenzenesulfonate and modified rosin powder mixed in a mass ratio of 1:1; the adhesive is a mixture of modified epoxy resin and modified water glass mixed in a mass ratio of 1:1.

[0032] The modified rosin powder is prepared as follows: by weight fraction, take 80 parts of rosin powder and 30 parts of sodium hydroxide, put them into a reaction kettle, add 60 parts of water, mix and stir for 40 minutes, heat to 70 °C, and keep warm for 60 minutes; heat to 80 °C, add 5 parts of tetrabutylammonium bromide and 40 parts of tall oil, keep warm for 40 minutes; heat to 90 °C, add 15 parts of petroleum sulfonate, keep warm for 40 minutes, and cool to room temperature to make it.

[0033] The modified epoxy resin is prepared as follows: by weight fraction, put a mixture of 80 parts of bisphenol A epoxy resin, 9 parts of isophorone diisocyanate, and 9 parts of polypropylene glycol into a reaction vessel, heat to 70 °C under nitrogen protection, add 1 - 3 parts of dibutyltin dilaurate for the first esterification reaction, the reaction time is 2 hours, after adding the obtained first esterification reaction solution and 9 parts of polypropylene glycol and mixing evenly, heat the system to 90 °C and carry out the second esterification reaction under nitrogen protection, stop the reaction after 3 hours to obtain the modified epoxy resin.

[0034] The modified water glass is prepared as follows: by weight fraction, take 8 parts of aluminum nitrate and 15 parts of trimethylethoxysilane, dissolve them in 50 parts of absolute ethanol, then add them to 300 parts of water glass, first carry out ultrasonic oscillation for 15 minutes to make them mix evenly, and then stir at a water bath temperature of 60 °C for 10 minutes to make it.

[0035] The preparation method of the functional carbon-reducing aid for reducing the carbon emission of concrete is as follows: by weight fraction, take 40 parts of tetraethyl orthosilicate, 40 parts of tetracalcium aluminoferrite, 16 parts of polycarboxylate superplasticizer, 20 parts of air-entraining agent, 20 parts of basalt fiber, and 50 parts of adhesive, put them into a blender and stir for 30 minutes under the condition of 1200 rpm to make it.

[0036] Comparative Example 1

[0037] A functional carbon reduction aid for reducing the carbon emissions of concrete is made from raw materials in the following weight parts: 50 parts of tetraethyl orthosilicate, 10 parts of polyethylene glycol, 16 parts of air-entraining agent, 10 parts of vanadium slag, and 30 parts of binder; the air-entraining agent is a mixture of sodium dodecylbenzenesulfonate and modified rosin powder mixed in a mass ratio of 1:1; the binder is a mixture of modified epoxy resin and modified water glass mixed in a mass ratio of 1:1.

[0038] The modified rosin powder is prepared according to the following method: Take 60 parts of rosin powder and 20 parts of sodium hydroxide by weight, put them into a reaction kettle, add 45 parts of water, mix and stir for 30 min, heat to 65 °C, and keep warm for 50 min; heat to 75 °C, add 3 parts of tetrabutylammonium bromide and 30 parts of tall oil, and keep warm for 30 min; heat to 85 °C, add 10 parts of petroleum sulfonate, keep warm for 30 min, and cool to room temperature to make it.

[0039] The modified epoxy resin is prepared according to the following method: Take a mixture of 70 parts of bisphenol A epoxy resin, 8 parts of isophorone diisocyanate, and 8 parts of polypropylene glycol by weight, place it in a reaction vessel, heat to 60 °C under nitrogen protection, add 2 parts of dibutyltin dilaurate for the first esterification reaction, and the reaction time is 3 h. After adding the obtained first esterification reaction solution and 8 parts of polypropylene glycol and mixing evenly, heat the system to 80 °C and carry out the second esterification reaction under nitrogen protection. Stop the reaction after 4 h to obtain the modified epoxy resin.

[0040] The modified water glass is prepared according to the following method: Take 6 parts of aluminum nitrate and 12 parts of trimethylethoxysilane by weight, dissolve them in 40 parts of absolute ethanol, then add them to 200 parts of water glass, first carry out ultrasonic oscillation for 12 min to make it mix evenly, and then stir at a water bath temperature of 50 °C for 20 min to make it.

[0041] The preparation method of the functional carbon reduction aid for reducing the carbon emissions of concrete is as follows: Take 50 parts of tetraethyl orthosilicate, 10 parts of polyethylene glycol, 16 parts of air-entraining agent, 10 parts of vanadium slag, and 30 parts of binder by weight fraction, put them into a mixer, and stir at 800 rpm for 40 min to make it.

[0042] Comparative Example 2

[0043] A functional carbon reduction aid for reducing the carbon emissions of concrete is made from raw materials in the following weight parts: 50 parts of tetracalcium ferroaluminate, 10 parts of polyethylene glycol, 16 parts of air-entraining agent, 10 parts of vanadium slag, and 30 parts of binder; the air-entraining agent is a mixture of sodium dodecylbenzenesulfonate and modified rosin powder mixed in a mass ratio of 1:1; the binder is a mixture of modified epoxy resin and modified water glass mixed in a mass ratio of 1:1.

[0044] The modified rosin powder is prepared as follows: Take 60 parts by weight of rosin powder and 20 parts of sodium hydroxide and put them into a reaction kettle, add 45 parts of water, mix and stir for 30 min, heat to 65 °C, and keep warm for 50 min; heat to 75 °C, add 3 parts of tetrabutylammonium bromide and 30 parts of tall oil, and keep warm for 30 min; heat to 85 °C, add 10 parts of petroleum sulfonate, keep warm for 30 min, and cool to room temperature to obtain the product.

[0045] The modified epoxy resin is prepared as follows: Take a mixture of 70 parts by weight of bisphenol A epoxy resin, 8 parts of isophorone diisocyanate, and 8 parts of polypropylene glycol and place it in a reaction vessel. Under nitrogen protection, heat it to 60 °C, add 2 parts of dibutyltin dilaurate for the first esterification reaction, and the reaction time is 3 h. After adding the obtained first esterification reaction solution to 8 parts of polypropylene glycol and mixing evenly, heat the system to 80 °C and carry out the second esterification reaction under nitrogen protection. Stop the reaction after 4 h to obtain the modified epoxy resin.

[0046] The modified sodium silicate is prepared as follows: Take 6 parts of aluminum nitrate and 12 parts of trimethylethoxysilane, dissolve them in 40 parts of absolute ethanol, and then add them to 200 parts of sodium silicate. First, perform ultrasonic oscillation for 12 min to make them mix evenly, and then stir at a water bath temperature of 50 °C for 20 min to obtain the product.

[0047] The preparation method of the functional carbon reduction aid for reducing the carbon emission of concrete is as follows: Take 50 parts by weight of tetracalcium ferroaluminate, 10 parts of polyethylene glycol, 16 parts of air-entraining agent, 10 parts of vanadium slag, and 30 parts of adhesive, put them into a mixer and stir at 800 rpm for 40 min to obtain the product.

[0048] Comparative Example 3

[0049] A functional carbon reduction aid for reducing the carbon emission of concrete is made from the following raw materials in parts by weight: 25 parts of tetraethyl orthosilicate, 25 parts of tetracalcium ferroaluminate, 10 parts of polyethylene glycol, 16 parts of sodium dodecylbenzenesulfonate, 10 parts of vanadium slag, and 30 parts of adhesive; the adhesive is a mixture of modified epoxy resin and modified sodium silicate mixed in a mass ratio of 1:1.

[0050] The modified epoxy resin is prepared as follows: Take a mixture of 70 parts by weight of bisphenol A epoxy resin, 8 parts of isophorone diisocyanate, and 8 parts of polypropylene glycol and place it in a reaction vessel. Under nitrogen protection, heat it to 60 °C, add 2 parts of dibutyltin dilaurate for the first esterification reaction, and the reaction time is 3 h. After adding the obtained first esterification reaction solution to 8 parts of polypropylene glycol and mixing evenly, heat the system to 80 °C and carry out the second esterification reaction under nitrogen protection. Stop the reaction after 4 h to obtain the modified epoxy resin.

[0051] The modified sodium silicate is prepared as follows: By weight, take 6 parts of aluminum nitrate and 12 parts of trimethylethoxysilane, dissolve them in 40 parts of absolute ethanol, then add them to 200 parts of sodium silicate. First, perform ultrasonic oscillation for 12 min to make the mixture uniform, and then stir at a water bath temperature of 50 °C for 20 min to obtain the product.

[0052] The preparation method of the functional carbon reduction aid for reducing the carbon emission of concrete is as follows: By weight fraction, take 25 parts of tetraethyl orthosilicate, 25 parts of tetracalcium ferroaluminate, 10 parts of polyethylene glycol, 16 parts of sodium dodecylbenzenesulfonate, 10 parts of vanadium slag, and 30 parts of binder, put them into a blender and stir at 800 rpm for 40 min to obtain the product.

[0053] Comparative Example 4

[0054] A functional carbon reduction aid for reducing the carbon emission of concrete is made from the following raw materials by weight: 25 parts of tetraethyl orthosilicate, 25 parts of tetracalcium ferroaluminate, 10 parts of polyethylene glycol, 16 parts of modified rosin powder, 10 parts of vanadium slag, and 30 parts of binder; the binder is a mixture of modified epoxy resin and modified sodium silicate mixed in a mass ratio of 1:1.

[0055] The modified rosin powder is prepared as follows: By weight, take 60 parts of rosin powder and 20 parts of sodium hydroxide, put them into a reaction kettle, add 45 parts of water, mix and stir for 30 min, heat to 65 °C, and keep warm for 50 min; heat to 75 °C, add 3 parts of tetrabutylammonium bromide and 30 parts of tall oil, and keep warm for 30 min; heat to 85 °C, add 10 parts of petroleum sulfonate, keep warm for 30 min, and then cool to room temperature to obtain the product.

[0056] The modified epoxy resin is prepared as follows: By weight, take a mixture of 70 parts of bisphenol A epoxy resin, 8 parts of isophorone diisocyanate, and 8 parts of polypropylene glycol and place it in a reaction vessel. Under nitrogen protection, heat it to 60 °C, add 2 parts of dibutyltin dilaurate for the first esterification reaction, and the reaction time is 3 h. After adding the obtained first esterification reaction solution and 8 parts of polypropylene glycol and mixing them evenly, heat the system to 80 °C and carry out the second esterification reaction under nitrogen protection. Stop the reaction after 4 h to obtain the modified epoxy resin.

[0057] The modified sodium silicate is prepared as follows: By weight, take 6 parts of aluminum nitrate and 12 parts of trimethylethoxysilane, dissolve them in 40 parts of absolute ethanol, then add them to 200 parts of sodium silicate. First, perform ultrasonic oscillation for 12 min to make the mixture uniform, and then stir at a water bath temperature of 50 °C for 20 min to obtain the product.

[0058] The preparation method of the functional carbon-reducing additive for reducing the carbon emission of concrete is as follows: by weight fraction, take 25 parts of tetraethyl orthosilicate, 25 parts of tetracalcium ferroaluminate, 10 parts of polyethylene glycol, 16 parts of modified rosin powder, 10 parts of vanadium slag, and 30 parts of binder, put them into a blender and stir at 800 rpm for 40 minutes to make it.

[0059] Control Example 5

[0060] A functional carbon-reducing additive for reducing the carbon emission of concrete is made from the following raw materials by weight: 25 parts of tetraethyl orthosilicate, 25 parts of tetracalcium ferroaluminate, 10 parts of polyethylene glycol, 16 parts of air-entraining agent, 10 parts of vanadium slag, and 30 parts of modified epoxy resin; the air-entraining agent is a mixture of sodium dodecylbenzenesulfonate and modified rosin powder in a mass ratio of 1:1.

[0061] The modified rosin powder is prepared as follows: by weight fraction, take 60 parts of rosin powder and 20 parts of sodium hydroxide, put them into a reaction kettle, add 45 parts of water, mix and stir for 30 minutes, heat to 65 °C, and keep warm for 50 minutes; heat to 75 °C, add 3 parts of tetrabutylammonium bromide and 30 parts of tall oil, keep warm for 30 minutes; heat to 85 °C, add 10 parts of petroleum sulfonate, keep warm for 30 minutes, and cool to room temperature to make it.

[0062] The modified epoxy resin is prepared as follows: by weight fraction, take a mixture of 70 parts of bisphenol A epoxy resin, 8 parts of isophorone diisocyanate, and 8 parts of polypropylene glycol and place it in a reaction vessel. Under nitrogen protection, heat it to 60 °C, add 2 parts of dibutyltin dilaurate for the first esterification reaction, and the reaction time is 3 hours. After adding 8 parts of polypropylene glycol to the obtained first esterification reaction solution and mixing evenly, heat the system to 80 °C and carry out the second esterification reaction under nitrogen protection. Stop the reaction after 4 hours to obtain the modified epoxy resin.

[0063] The preparation method of the functional carbon-reducing additive for reducing the carbon emission of concrete is as follows: by weight fraction, take 25 parts of tetraethyl orthosilicate, 25 parts of tetracalcium ferroaluminate, 10 parts of polyethylene glycol, 16 parts of air-entraining agent, 10 parts of vanadium slag, and 30 parts of modified epoxy resin, put them into a blender and stir at 800 rpm for 40 minutes to make it.

[0064] Control Example 6

[0065] A functional carbon-reducing additive for reducing the carbon emission of concrete is made from the following raw materials by weight: 25 parts of tetraethyl orthosilicate, 25 parts of tetracalcium ferroaluminate, 10 parts of polyethylene glycol, 16 parts of air-entraining agent, 10 parts of vanadium slag, and 30 parts of modified water glass; the air-entraining agent is a mixture of sodium dodecylbenzenesulfonate and modified rosin powder in a mass ratio of 1:1.

[0066] The modified rosin powder is prepared as follows: Take 60 parts by weight of rosin powder and 20 parts by weight of sodium hydroxide and put them into a reaction kettle, add 45 parts by weight of water, mix and stir for 30 min, heat to 65 °C, and keep warm for 50 min; heat to 75 °C, add 3 parts by weight of tetrabutylammonium bromide and 30 parts by weight of tall oil, and keep warm for 30 min; heat to 85 °C, add 10 parts by weight of petroleum sulfonate, keep warm for 30 min, and then cool to room temperature to obtain the product.

[0067] The modified sodium silicate is prepared as follows: Take 6 parts by weight of aluminum nitrate and 12 parts by weight of trimethylethoxysilane, dissolve them in 40 parts by weight of absolute ethanol, then add them to 200 parts by weight of sodium silicate, first perform ultrasonic oscillation for 12 min to make them mix evenly, and then stir at a water bath temperature of 50 °C for 20 min to obtain the product.

[0068] The preparation method of the functional carbon reduction aid for reducing the carbon emission of concrete is as follows: Take 25 parts by weight of tetraethyl orthosilicate, 25 parts by weight of tetracalcium aluminoferrite, 10 parts by weight of polyethylene glycol, 16 parts by weight of air-entraining agent, 10 parts by weight of vanadium slag, and 30 parts by weight of modified sodium silicate, put them into a mixer and stir at 800 rpm for 40 min to obtain the product.

[0069] Experimental examples:

[0070] The gel material cement uses ordinary Portland cement (P.O 42.5R), the aggregate material selects limestone manufactured sand, the stone powder content in the manufactured sand is 10%, the aid uses the aid prepared in Example 1, configure the concrete, the aid content in the dry concrete is 8%, the cement content is 10%, 15%, 20%, 25%, 30%, 35%, 40% respectively, and the balance is limestone manufactured sand. The mass ratio of the dry material to water is 1:0.44; prepare concrete specimens according to the conventional method (cure for 28 d).

[0071] The compressive strength of the concrete is carried out according to the relevant regulations in the "Standard for Test Methods of Mechanical Properties of Ordinary Concrete" (GB / T 50081-2002) of the People's Republic of China. The specimen size is 100 mm × 100 mm × 100 mm, 3 specimens in each group, and the reduction coefficient is 0.95. The test results are shown in Table 1:

[0072] Table 1

[0073]

[0074] It can be seen from Table 1 that when the cement addition amount is less than 10%, the compressive strength of the prepared concrete is too low to be used. When the addition amount is higher than 30%, the increase in compressive strength is not obvious. The best cement content that can maintain the compressive strength of the concrete and reduce the cement usage amount is 25%.

[0075] Using the additives prepared in Examples 1-3 and Comparative Examples 1-2 as admixtures, with an addition amount of 8%, a cement addition amount of 25%, and a limestone manufactured sand addition amount of 67%; the mass ratio of dry materials to water is 1:0.44; preparing concrete specimens according to the conventional method (curing for 28 days), measuring the compressive strength of the prepared concrete, and the test results are shown in Table 2:

[0076] Table 2

[0077]

[0078] Note: * represents P < 0.05 compared with Example 1.

[0079] Using the additives prepared in Examples 1-3 and Comparative Examples 3-4 as admixtures, with an addition amount of 8%, a cement addition amount of 25%, and a limestone manufactured sand addition amount of 67%; the mass ratio of dry materials to water is 1:0.44; after stirring evenly, conduct a concrete slump test, and the experiment is carried out according to the relevant regulations in the "Standard Test Method for Properties of Ordinary Concrete Mixtures" (GB / T 50080-2002) of the People's Republic of China National Standard. There are 3 in each group, and the test results are shown in Table 3:

[0080] Table 3

[0081]

[0082]

[0083] Note: * represents P < 0.05 compared with Example 1.

[0084] Using the additives prepared in Examples 1-3 and Comparative Examples 5-6 as admixtures, with an addition amount of 8%, a cement addition amount of 25%, and a limestone manufactured sand addition amount of 67%; the mass ratio of dry materials to water is 1:0.44; preparing concrete specimens according to the conventional method (curing for 28 days); measuring the static compressive elastic modulus of concrete, and the experiment is carried out according to the relevant regulations in the "Standard Test Method for Mechanical Properties of Ordinary Concrete" (GB / T 50081-2002) of the People's Republic of China National Standard. The specimen size is 100 mm × 100 mm × 300 mm, with 6 in each group. Among them, 3 specimens are used to measure their axial compressive strength, and the reduction coefficient is 0.95. The other 3 specimens are used to measure their compressive deformation. The calculation method of the static compressive elastic modulus is as follows:

[0085]

[0086] In the formula, E c - Static compressive elastic modulus of concrete (MPa);

[0087] F a - Load (N) when the stress is 1 / 3 of the axial compressive strength;

[0088] F 0 - The initial load (N) when the stress is 0.5 MPa;

[0089] A - The bearing area of the specimen (mm 2 );

[0090] L - The gauge length for measurement (mm);

[0091] Δ n = C a - C 0 ; C a is the average value of the deformations on both sides of the specimen (mm) when F is a , and C 0 is the average value of the deformations on both sides of the specimen (mm) when F is 0 . The test results are shown in Table 4:

[0092] Table 4

[0093]

[0094]

[0095] Note: * represents P < 0.05 compared with Example 1.

[0096] The above-described embodiments merely represent several implementation manners of the present invention. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A functional carbon reduction additive for reducing the carbon emissions of concrete, characterized in that, it is made from the following raw materials in parts by weight: 10 - 40 parts of tetraethyl orthosilicate, 10 - 40 parts of tetracalcium ferroaluminate, 8 - 16 parts of water reducing agent, 5 - 20 parts of air entraining agent, 5 - 20 parts of strengthening agent, 20 - 50 parts of adhesive; the air entraining agent is a mixture of sodium dodecylbenzenesulfonate and modified rosin powder in a mass ratio of 1:1; the modified rosin powder is prepared according to the following method: Take 50 - 80 parts of rosin powder and 10 - 30 parts of sodium hydroxide in parts by weight and put them into a reaction kettle, add 30 - 60 parts of water, mix and stir for 20 - 40 min, heat to 60 - 70 °C, and keep warm for 40 - 60 min; heat to 70 - 80 °C, add 1 - 5 parts of tetrabutylammonium bromide and 20 - 40 parts of tall oil, and keep warm for 20 - 40 min; heat to 80 - 90 °C, add 5 - 15 parts of petroleum sulfonate, keep warm for 20 - 40 min, and cool to room temperature to make it.

2. The functional carbon reduction additive for reducing the carbon emissions of concrete according to claim 1, characterized in that, the water reducing agent is one or more of polyethylene glycol, calcium lignosulfonate, and polycarboxylate water reducing agent.

3. The functional carbon reduction additive for reducing the carbon emissions of concrete according to claim 1, characterized in that, the strengthening agent is one or more of vanadium slag, white carbon black, calcium silicate whiskers, and basalt fibers.

4. The functional carbon reduction additive for reducing the carbon emissions of concrete according to claim 1, characterized in that, the adhesive is a mixture of modified epoxy resin and modified water glass in a mass ratio of 1:

1.

5. The functional carbon reduction additive for reducing the carbon emissions of concrete according to claim 4, characterized in that, the modified epoxy resin is prepared according to the following method: Take a mixture of 60 - 80 parts of bisphenol A epoxy resin, 5 - 10 parts of isophorone diisocyanate, and 5 - 10 parts of polypropylene glycol in parts by weight and place it in a reaction vessel. Under nitrogen protection, heat it to 50 - 70 °C, add 1 - 3 parts of dibutyltin dilaurate for the first esterification reaction, and the reaction time is 2 - 4 h. After adding the obtained first esterification reaction solution and 5 - 10 parts of polypropylene glycol and mixing evenly, heat the system to 70 - 90 °C and carry out the second esterification reaction under nitrogen protection. Stop the reaction after 3 - 6 h to obtain the modified epoxy resin.

6. The functional carbon reduction additive for reducing the carbon emissions of concrete according to claim 4, characterized in that, the modified water glass is prepared according to the following method: Take 3 - 8 parts of aluminum nitrate and 3 - 15 parts of trimethylethoxysilane in parts by weight, dissolve them in 30 - 50 parts of absolute ethanol, and then add them to 100 - 300 parts of water glass. First, carry out ultrasonic oscillation for 10 - 15 min to make it mix evenly, and then stir at a water bath temperature of 40 - 60 °C for 10 - 30 min to make it.

7. The preparation method of the functional carbon reduction additive for reducing the carbon emissions of concrete according to claim 1, characterized in that, By weight fraction, take 10 - 40 parts of tetraethyl orthosilicate, 10 - 40 parts of tetracalcium ferroaluminate, 8 - 16 parts of water reducing agent, 5 - 20 parts of air entraining agent, 5 - 20 parts of strengthening agent, and 20 - 50 parts of adhesive, put them into a mixer and stir at 600 - 1200 rpm for 30 - 60 min to make it.

8. Application of the functional carbon reduction aid for reducing concrete carbon emissions described in claim 1 in the preparation of concrete with low cement consumption, characterized in that, the amount of cement in the concrete with low cement consumption is 15 - 30% of the mass of solid materials.

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