CN112430042A - Low-rubber high-flow-state high-performance concrete and preparation method thereof - Google Patents

Abstract

The invention discloses a low-rubber high-flow high-performance concrete and a preparation method thereof, wherein the low-rubber high-flow high-performance concrete comprises the following raw materials in parts by weight: 570 portions of 520-glass cement, 626-glass sand 702 portions, 1061-glass gravel 1152 portions, 130-glass water 140 portions and 4.88-8.67 portions of water reducer; adding the medium sand, the broken stone and the cementing material into a stirrer, stirring for 0.5-1.5min at the rotating speed of 40-60r/min to prepare a mixture, then sequentially adding water and a water reducing agent into the stirrer, and continuously stirring for 3-5min at the rotating speed to prepare the low-cement high-flow-state high-performance concrete; the concrete has higher fluidity, does not need vibration, can pass through a reinforcing steel bar dense area by means of self weight, can reduce the quality defect of the concrete caused by incapability of vibrating or incompact vibrating compared with the common concrete, and realizes high flow state and high performance of the concrete under the lower consumption of cementing materials.

Description

Low-rubber high-flow-state high-performance concrete and preparation method thereof

Technical Field

The invention belongs to the technical field of concrete preparation, and particularly relates to low-rubber high-flow-state high-performance concrete and a preparation method thereof.

Background

In recent years, in the period of highway and various infrastructures in high-speed construction, the structural complexity brought by actual working conditions and technological innovation also puts high requirements on the performance of concrete. In order to solve the problem that vibration operation (such as over-dense steel bars or complex structures) is difficult or impossible, improve the durability of a concrete structure, reduce the influence of construction noise on the environment, solve the problems of labor shortage and the like, technical workers provide the concept of high-flow concrete. Several techniques are currently applied: firstly, the fluidity of the concrete is improved by improving the using amount of the cementing material and the sand rate, so that the high flow state performance of the concrete is realized; secondly, the high flow property of the concrete is realized by introducing silica fume or micro-beads and the like; thirdly, the high flow performance of the concrete is realized by changing the water-cement ratio and the like. Meanwhile, most of the existing high-flow concrete has the strength grade not exceeding C50.

However, the concrete self-shrinkage is larger only by the technical measures of increasing the water-cement ratio and the cementing material and sand rate, and the durability of the structure is influenced; the concrete economy problem can be caused by simply increasing the dosage of the cementing material and introducing silica fume or micro-beads.

Disclosure of Invention

In order to overcome the technical problems, the invention provides low-rubber high-flow high-performance concrete and a preparation method thereof.

The purpose of the invention can be realized by the following technical scheme:

a low-rubber high-flow-state high-performance concrete comprises the following raw materials in parts by weight: 570 portions of 520-glass cement, 626-glass sand 702 portions, 1061-glass gravel 1152 portions, 130-glass water 140 portions and 4.88-8.67 portions of water reducer;

the low-rubber high-flow high-performance concrete is prepared by the following method:

adding the medium sand, the broken stone and the cementing material into a stirrer, stirring for 0.5-1.5min at the rotating speed of 40-60r/min to obtain a mixture, then sequentially adding water and a water reducing agent into the stirrer, and continuously stirring for 3-5min at the rotating speed to obtain the low-cement high-flow-state high-performance concrete.

Further, the water reducing agent is a polycarboxylic acid water reducing agent, and the gravel is formed by blending two grades of materials with the grain sizes of 5-10mm and 10-20mm according to the weight ratio of 1: 1.

Further, the cement material is prepared by the following method:

step S1, adding acrylic acid and polyethylene glycol monomethyl ether into a three-neck flask, adding toluene, heating in a water bath at 45-50 ℃, magnetically stirring at a rotating speed of 100-;

step S2, adding the fly ash into absolute ethyl alcohol, stirring at a high speed of 500r/min for 400 plus one year for 30min to prepare a suspension, carrying out ultrasonic treatment on the suspension for 30min, controlling the power of the ultrasonic treatment to be 30-40min, centrifuging at a speed of 10000r/min for 3min at 8000 plus one year after the ultrasonic treatment is finished, adding the prepared filter residue into deionized water, repeating the steps, drying the prepared filter cake for 12h under the vacuum condition of 80-100 ℃ and-0.10 MPa of vacuum degree to prepare activated fly ash, and controlling the dosage ratio of the fly ash to the absolute ethyl alcohol to be 100 g: 500 mL;

step S3, adding the activated fly ash into a sodium hydroxide aqueous solution with the mass fraction of 20%, uniformly stirring for 5h, decompressing, filtering, washing to be neutral, adding filter residue into a sulfuric acid solution with the mass fraction of 10%, uniformly stirring for 4h, filtering, washing to be neutral, drying at 80-100 ℃ for 10h to obtain fly ash with a treated surface, adding the fly ash with the treated surface, hydroquinone, methylbenzene and KH560 into a three-neck flask, uniformly mixing, heating to 50-65 ℃, uniformly stirring, reacting for 10h, centrifuging, washing, and vacuum drying for 10h to obtain the treated fly ash;

step S4, adding the prepared treated fly ash into water according to the weight ratio of 1: 2, and uniformly dispersing to prepare a suspension for later use; adding the monomers into water according to the weight ratio of 1: 5, and uniformly dispersing to prepare a first solution; adding ammonium sulfate into water according to the weight ratio of 1: 50, and uniformly dispersing to prepare a second solution; then, simultaneously dripping the first solution and the second solution into the suspension for 2 hours, heating to 70-90 ℃ after dripping is finished, stirring at a constant speed, reacting for 3 hours, centrifuging and washing to obtain the modified fly ash, wherein the volume ratio of the suspension to the first solution to the second solution is controlled to be 1: 2;

and step S5, uniformly mixing the prepared modified fly ash, Portland cement and slag powder to prepare the cementing material, wherein the dosage of the modified fly ash is 5-15% of the weight of the cementing material, and the dosage of the slag powder is 5-15% of the weight of the cementing material.

In the step S1, mixing acrylic acid and polyethylene glycol monomethyl ether, adding toluene as a solvent, adding hydroquinone as a polymerization inhibitor, adding p-toluenesulfonic acid as a catalyst, and reacting the acrylic acid and the polyethylene glycol monomethyl ether to generate a monomer; step S2, the fly ash is dispersed in absolute ethyl alcohol, then ultrasonic impurity removal treatment is carried out in deionized water, and activated fly ash is prepared; step S3, adding the activated fly ash into a sodium hydroxide aqueous solution and a sulfuric acid solution respectively, carrying out hydroxylation treatment on the fly ash through acid-base treatment to prepare surface-treated fly ash, mixing the hydroxylated fly ash with KH560, wherein the KH560 can carry out coupling modification on the hydroxylated fly ash to prepare treated fly ash, then preparing the treated fly ash into suspension in step S4, using the second solution as an initiator solution, dripping a monomer, reacting and polymerizing carbon-carbon double bonds on the monomer and carbon-carbon double bonds on the coupling-modified fly ash to prepare modified fly ash, and finally uniformly mixing the modified fly ash, Portland cement and slag powder to prepare a cementing material, wherein the monomer on the surface of the modified fly ash can play a surface activity role, and can increase the fluidity of a mixture formed in the concrete preparation process, in addition, in the use process of the cementing material, the modified fly ash is hydrated and dehydrated to form a colloidal film layer which is distributed in the hardened concrete, so that the defects and tiny cracks in the concrete can be filled, the bonding structure of a concrete aggregate-gel interface can be improved, and the mechanical strength of the prepared concrete is further improved.

Further, the slag powder in the step S5 is S95 grade, the strength grade of the portland cement is 52.5R, and the 28d mortar strength of the portland cement is not less than 1.1 times of the strength grade.

Further, in step S1, the molar ratio of acrylic acid to polyethylene glycol monomethyl ether is controlled to be 1: 3, the dosage of hydroquinone is 3-5% of the mass of acrylic acid, the weight ratio of hydroquinone to p-toluenesulfonic acid is 2: 1, the dosage ratio of the activated fly ash, the sodium hydroxide aqueous solution and the sulfuric acid solution in step S3 is controlled to be 50 g: 50mL, and the weight ratio of the surface-treated fly ash, hydroquinone, toluene and KH560 is 10: 0.2: 20: 0.3-0.5.

A preparation method of low-gel high-flow-state high-performance concrete comprises the following steps:

adding the medium sand, the broken stone and the cementing material into a stirrer, stirring for 0.5-1.5min at the rotating speed of 40-60r/min to obtain a mixture, then sequentially adding water and a water reducing agent into the stirrer, and continuously stirring for 3-5min at the rotating speed to obtain the low-cement high-flow-state high-performance concrete.

The invention has the beneficial effects that:

(1) the low-gel high-flow high-performance concrete has higher fluidity, does not need vibration, can pass through a reinforcing steel bar dense area by means of self weight, can reduce the quality defect of the concrete caused by incapability of vibrating or incompact vibration compared with the common concrete, and realizes the high flow state and high performance of the concrete under the condition of lower consumption of cementing materials. Compared with the traditional high-flow concrete and the traditional high-performance concrete, the lower consumption of the cementing material can reduce the hydration heat of the concrete, thereby reducing the risk of temperature cracks; the self-contraction risk brought by self-hydration reaction can be reduced; the comprehensive cost can be reduced.

(2) In the preparation process, in step S1, mixing acrylic acid and polyethylene glycol monomethyl ether, adding toluene as a solvent, adding hydroquinone as a polymerization inhibitor, adding p-toluenesulfonic acid as a catalyst, and reacting the acrylic acid and the polyethylene glycol monomethyl ether to generate a monomer; step S2, the fly ash is dispersed in absolute ethyl alcohol, then ultrasonic impurity removal treatment is carried out in deionized water, and activated fly ash is prepared; step S3, adding the activated fly ash into a sodium hydroxide aqueous solution and a sulfuric acid solution respectively, carrying out hydroxylation treatment on the fly ash through acid-base treatment to prepare surface-treated fly ash, mixing the hydroxylated fly ash with KH560, wherein the KH560 can carry out coupling modification on the hydroxylated fly ash to prepare treated fly ash, then preparing the treated fly ash into suspension in step S4, using the second solution as an initiator solution, dripping a monomer, reacting and polymerizing carbon-carbon double bonds on the monomer and carbon-carbon double bonds on the coupling-modified fly ash to prepare modified fly ash, and finally uniformly mixing the modified fly ash, Portland cement and slag powder to prepare a cementing material, wherein the monomer on the surface of the modified fly ash can play a surface activity role, and can increase the fluidity of a mixture formed in the concrete preparation process, in addition, in the use process of the cementing material, the modified fly ash is hydrated and dehydrated to form a colloidal film layer which is distributed in the hardened concrete, so that the defects and tiny cracks in the concrete can be filled, the bonding structure of a concrete aggregate-gel interface can be improved, and the mechanical strength of the prepared concrete is further improved.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

A low-rubber high-flow-state high-performance concrete comprises the following raw materials in parts by weight: 520 parts of a cementing material, 626 parts of medium sand, 1061 parts of broken stone, 130 parts of water and 4.88 parts of a water reducing agent;

the low-rubber high-flow high-performance concrete is prepared by the following method:

and adding the medium sand, the broken stone and the cementing material into a stirrer, stirring for 1min at the rotating speed of 50r/min to prepare a mixture, then sequentially adding water and a water reducing agent into the stirrer, and continuously stirring for 5min at the rotating speed to prepare the low-gel high-flow high-performance concrete.

The water reducing agent is a polycarboxylic acid water reducing agent, and the gravel is formed by blending two grades of materials with the particle size of 5mm and 10mm according to the weight ratio of 1: 1.

The gelled material is prepared by the following method:

step S1, adding acrylic acid and polyethylene glycol monomethyl ether into a three-neck flask, adding toluene, heating in a water bath at 45 ℃, magnetically stirring at a rotating speed of 100r/min for 30min, then adding hydroquinone, stirring at a constant speed for 5min, then adding p-toluenesulfonic acid, stirring at a constant speed for 5min, heating to 90 ℃, reacting and refluxing at the temperature for 5h to obtain a reaction product, decompressing and distilling to obtain a monomer, wherein the molar ratio of the acrylic acid to the polyethylene glycol monomethyl ether is controlled to be 1: 3, the dosage of the hydroquinone is 3% of the mass of the acrylic acid, and the weight ratio of the hydroquinone to the p-toluenesulfonic acid is controlled to be 2: 1;

step S2, adding the fly ash into absolute ethyl alcohol, stirring at a high speed of 400r/min for 30min to prepare a suspension, carrying out ultrasonic treatment on the suspension for 30min, controlling the ultrasonic power to be 30min, centrifuging at a speed of 80000r/min for 3min after the ultrasonic treatment is finished, adding the prepared filter residue into deionized water, repeating the steps, drying the prepared filter cake for 12h under the vacuum conditions that the temperature is 80 ℃ and the vacuum degree is-0.10 MPa to prepare activated fly ash, and controlling the dosage ratio of the fly ash to the absolute ethyl alcohol to be 100 g: 500 mL;

step S3, adding the activated fly ash into a sodium hydroxide aqueous solution with the mass fraction of 20%, uniformly stirring for 5h, decompressing, filtering, washing to be neutral, adding filter residue into a sulfuric acid solution with the mass fraction of 10%, uniformly stirring for 4h, filtering, washing to be neutral, drying at 100 ℃ for 10h to obtain fly ash with a surface treated, adding the fly ash with the surface treated, hydroquinone, methylbenzene and KH560 into a three-neck flask, uniformly mixing, heating to 50 ℃, uniformly stirring, reacting for 10h, centrifuging, washing, and vacuum drying for 10h to obtain the treated fly ash, wherein the use ratio of the activated fly ash, the sodium hydroxide aqueous solution and the sulfuric acid solution is controlled to be 50 g: 50mL, and the weight ratio of the fly ash with the surface treated, the hydroquinone, the methylbenzene and the KH560 is controlled to be 10: 0.2: 20: 0.3;

step S4, adding the prepared treated fly ash into water according to the weight ratio of 1: 2, and uniformly dispersing to prepare a suspension for later use; adding the monomers into water according to the weight ratio of 1: 5, and uniformly dispersing to prepare a first solution; adding ammonium sulfate into water according to the weight ratio of 1: 50, and uniformly dispersing to prepare a second solution; then, simultaneously dripping the first solution and the second solution into the suspension for 2 hours, heating to 70 ℃ after dripping is finished, stirring at a constant speed, reacting for 3 hours, centrifuging and washing to obtain the modified fly ash, wherein the volume ratio of the suspension to the first solution to the second solution is controlled to be 1: 2;

and step S5, uniformly mixing the prepared modified fly ash, Portland cement and slag powder to prepare the cementing material, wherein the use amount of the modified fly ash is 10% of the weight of the cementing material, and the use amount of the slag powder is 15% of the weight of the cementing material.

Example 2

A low-rubber high-flow-state high-performance concrete comprises the following raw materials in parts by weight: 530 parts of a cementing material, 650 parts of medium sand, 1080 parts of broken stone, 135 parts of water and 5.25 parts of a water reducing agent;

the low-rubber high-flow high-performance concrete is prepared by the following method:

and adding the medium sand, the broken stone and the cementing material into a stirrer, stirring for 1min at the rotating speed of 50r/min to prepare a mixture, then sequentially adding water and a water reducing agent into the stirrer, and continuously stirring for 5min at the rotating speed to prepare the low-gel high-flow high-performance concrete.

The water reducing agent is a polycarboxylic acid water reducing agent, and the gravel is formed by blending two grades of materials with the particle size of 5mm and 10mm according to the weight ratio of 1: 1.

The gelled material is prepared by the following method:

step S1, adding acrylic acid and polyethylene glycol monomethyl ether into a three-neck flask, adding toluene, heating in a water bath at 45 ℃, magnetically stirring at a rotating speed of 100r/min for 30min, then adding hydroquinone, stirring at a constant speed for 5min, then adding p-toluenesulfonic acid, stirring at a constant speed for 5min, heating to 90 ℃, reacting and refluxing at the temperature for 5h to obtain a reaction product, decompressing and distilling to obtain a monomer, wherein the molar ratio of the acrylic acid to the polyethylene glycol monomethyl ether is controlled to be 1: 3, the dosage of the hydroquinone is 3% of the mass of the acrylic acid, and the weight ratio of the hydroquinone to the p-toluenesulfonic acid is controlled to be 2: 1;

step S2, adding the fly ash into absolute ethyl alcohol, stirring at a high speed of 400r/min for 30min to prepare a suspension, carrying out ultrasonic treatment on the suspension for 30min, controlling the ultrasonic power to be 30min, centrifuging at a speed of 80000r/min for 3min after the ultrasonic treatment is finished, adding the prepared filter residue into deionized water, repeating the steps, drying the prepared filter cake for 12h under the vacuum conditions that the temperature is 80 ℃ and the vacuum degree is-0.10 MPa to prepare activated fly ash, and controlling the dosage ratio of the fly ash to the absolute ethyl alcohol to be 100 g: 500 mL;

step S3, adding the activated fly ash into a sodium hydroxide aqueous solution with the mass fraction of 20%, uniformly stirring for 5h, decompressing, filtering, washing to be neutral, adding filter residue into a sulfuric acid solution with the mass fraction of 10%, uniformly stirring for 4h, filtering, washing to be neutral, drying at 100 ℃ for 10h to obtain fly ash with a surface treated, adding the fly ash with the surface treated, hydroquinone, methylbenzene and KH560 into a three-neck flask, uniformly mixing, heating to 50 ℃, uniformly stirring, reacting for 10h, centrifuging, washing, and vacuum drying for 10h to obtain the treated fly ash, wherein the use ratio of the activated fly ash, the sodium hydroxide aqueous solution and the sulfuric acid solution is controlled to be 50 g: 50mL, and the weight ratio of the fly ash with the surface treated, the hydroquinone, the methylbenzene and the KH560 is controlled to be 10: 0.2: 20: 0.3;

step S4, adding the prepared treated fly ash into water according to the weight ratio of 1: 2, and uniformly dispersing to prepare a suspension for later use; adding the monomers into water according to the weight ratio of 1: 5, and uniformly dispersing to prepare a first solution; adding ammonium sulfate into water according to the weight ratio of 1: 50, and uniformly dispersing to prepare a second solution; then, simultaneously dripping the first solution and the second solution into the suspension for 2 hours, heating to 70 ℃ after dripping is finished, stirring at a constant speed, reacting for 3 hours, centrifuging and washing to obtain the modified fly ash, wherein the volume ratio of the suspension to the first solution to the second solution is controlled to be 1: 2;

and step S5, uniformly mixing the prepared modified fly ash, Portland cement and slag powder to prepare the cementing material, wherein the use amount of the modified fly ash is 10% of the weight of the cementing material, and the use amount of the slag powder is 15% of the weight of the cementing material.

Example 3

A low-rubber high-flow-state high-performance concrete comprises the following raw materials in parts by weight: 550 parts of a cementing material, 686 parts of medium sand, 1130 parts of gravel, 138 parts of water and 7.25 parts of a water reducing agent;

the low-rubber high-flow high-performance concrete is prepared by the following method:

and adding the medium sand, the broken stone and the cementing material into a stirrer, stirring for 1min at the rotating speed of 50r/min to prepare a mixture, then sequentially adding water and a water reducing agent into the stirrer, and continuously stirring for 5min at the rotating speed to prepare the low-gel high-flow high-performance concrete.

The water reducing agent is a polycarboxylic acid water reducing agent, and the gravel is formed by blending two grades of materials with the particle size of 5mm and 10mm according to the weight ratio of 1: 1.

The gelled material is prepared by the following method:

step S1, adding acrylic acid and polyethylene glycol monomethyl ether into a three-neck flask, adding toluene, heating in a water bath at 45 ℃, magnetically stirring at a rotating speed of 100r/min for 30min, then adding hydroquinone, stirring at a constant speed for 5min, then adding p-toluenesulfonic acid, stirring at a constant speed for 5min, heating to 90 ℃, reacting and refluxing at the temperature for 5h to obtain a reaction product, decompressing and distilling to obtain a monomer, wherein the molar ratio of the acrylic acid to the polyethylene glycol monomethyl ether is controlled to be 1: 3, the dosage of the hydroquinone is 3% of the mass of the acrylic acid, and the weight ratio of the hydroquinone to the p-toluenesulfonic acid is controlled to be 2: 1;

step S2, adding the fly ash into absolute ethyl alcohol, stirring at a high speed of 400r/min for 30min to prepare a suspension, carrying out ultrasonic treatment on the suspension for 30min, controlling the ultrasonic power to be 30min, centrifuging at a speed of 80000r/min for 3min after the ultrasonic treatment is finished, adding the prepared filter residue into deionized water, repeating the steps, drying the prepared filter cake for 12h under the vacuum conditions that the temperature is 80 ℃ and the vacuum degree is-0.10 MPa to prepare activated fly ash, and controlling the dosage ratio of the fly ash to the absolute ethyl alcohol to be 100 g: 500 mL;

step S3, adding the activated fly ash into a sodium hydroxide aqueous solution with the mass fraction of 20%, uniformly stirring for 5h, decompressing, filtering, washing to be neutral, adding filter residue into a sulfuric acid solution with the mass fraction of 10%, uniformly stirring for 4h, filtering, washing to be neutral, drying at 100 ℃ for 10h to obtain fly ash with a surface treated, adding the fly ash with the surface treated, hydroquinone, methylbenzene and KH560 into a three-neck flask, uniformly mixing, heating to 50 ℃, uniformly stirring, reacting for 10h, centrifuging, washing, and vacuum drying for 10h to obtain the treated fly ash, wherein the use ratio of the activated fly ash, the sodium hydroxide aqueous solution and the sulfuric acid solution is controlled to be 50 g: 50mL, and the weight ratio of the fly ash with the surface treated, the hydroquinone, the methylbenzene and the KH560 is controlled to be 10: 0.2: 20: 0.3;

step S4, adding the prepared treated fly ash into water according to the weight ratio of 1: 2, and uniformly dispersing to prepare a suspension for later use; adding the monomers into water according to the weight ratio of 1: 5, and uniformly dispersing to prepare a first solution; adding ammonium sulfate into water according to the weight ratio of 1: 50, and uniformly dispersing to prepare a second solution; then, simultaneously dripping the first solution and the second solution into the suspension for 2 hours, heating to 70 ℃ after dripping is finished, stirring at a constant speed, reacting for 3 hours, centrifuging and washing to obtain the modified fly ash, wherein the volume ratio of the suspension to the first solution to the second solution is controlled to be 1: 2;

and step S5, uniformly mixing the prepared modified fly ash, Portland cement and slag powder to prepare the cementing material, wherein the use amount of the modified fly ash is 10% of the weight of the cementing material, and the use amount of the slag powder is 15% of the weight of the cementing material.

Example 4

A low-rubber high-flow-state high-performance concrete comprises the following raw materials in parts by weight: 570 parts of a cementing material, 702 parts of medium sand, 1152 parts of broken stone, 140 parts of water and 8.67 parts of a water reducing agent;

the low-rubber high-flow high-performance concrete is prepared by the following method:

and adding the medium sand, the broken stone and the cementing material into a stirrer, stirring for 1min at the rotating speed of 50r/min to prepare a mixture, then sequentially adding water and a water reducing agent into the stirrer, and continuously stirring for 5min at the rotating speed to prepare the low-gel high-flow high-performance concrete.

The water reducing agent is a polycarboxylic acid water reducing agent, and the gravel is formed by blending two grades of materials with the particle size of 5mm and 10mm according to the weight ratio of 1: 1.

The gelled material is prepared by the following method:

step S1, adding acrylic acid and polyethylene glycol monomethyl ether into a three-neck flask, adding toluene, heating in a water bath at 45 ℃, magnetically stirring at a rotating speed of 100r/min for 30min, then adding hydroquinone, stirring at a constant speed for 5min, then adding p-toluenesulfonic acid, stirring at a constant speed for 5min, heating to 90 ℃, reacting and refluxing at the temperature for 5h to obtain a reaction product, decompressing and distilling to obtain a monomer, wherein the molar ratio of the acrylic acid to the polyethylene glycol monomethyl ether is controlled to be 1: 3, the dosage of the hydroquinone is 3% of the mass of the acrylic acid, and the weight ratio of the hydroquinone to the p-toluenesulfonic acid is controlled to be 2: 1;

step S2, adding the fly ash into absolute ethyl alcohol, stirring at a high speed of 400r/min for 30min to prepare a suspension, carrying out ultrasonic treatment on the suspension for 30min, controlling the ultrasonic power to be 30min, centrifuging at a speed of 80000r/min for 3min after the ultrasonic treatment is finished, adding the prepared filter residue into deionized water, repeating the steps, drying the prepared filter cake for 12h under the vacuum conditions that the temperature is 80 ℃ and the vacuum degree is-0.10 MPa to prepare activated fly ash, and controlling the dosage ratio of the fly ash to the absolute ethyl alcohol to be 100 g: 500 mL;

step S3, adding the activated fly ash into a sodium hydroxide aqueous solution with the mass fraction of 20%, uniformly stirring for 5h, decompressing, filtering, washing to be neutral, adding filter residue into a sulfuric acid solution with the mass fraction of 10%, uniformly stirring for 4h, filtering, washing to be neutral, drying at 100 ℃ for 10h to obtain fly ash with a surface treated, adding the fly ash with the surface treated, hydroquinone, methylbenzene and KH560 into a three-neck flask, uniformly mixing, heating to 50 ℃, uniformly stirring, reacting for 10h, centrifuging, washing, and vacuum drying for 10h to obtain the treated fly ash, wherein the use ratio of the activated fly ash, the sodium hydroxide aqueous solution and the sulfuric acid solution is controlled to be 50 g: 50mL, and the weight ratio of the fly ash with the surface treated, the hydroquinone, the methylbenzene and the KH560 is controlled to be 10: 0.2: 20: 0.3;

step S4, adding the prepared treated fly ash into water according to the weight ratio of 1: 2, and uniformly dispersing to prepare a suspension for later use; adding the monomers into water according to the weight ratio of 1: 5, and uniformly dispersing to prepare a first solution; adding ammonium sulfate into water according to the weight ratio of 1: 50, and uniformly dispersing to prepare a second solution; then, simultaneously dripping the first solution and the second solution into the suspension for 2 hours, heating to 70 ℃ after dripping is finished, stirring at a constant speed, reacting for 3 hours, centrifuging and washing to obtain the modified fly ash, wherein the volume ratio of the suspension to the first solution to the second solution is controlled to be 1: 2;

and step S5, uniformly mixing the prepared modified fly ash, Portland cement and slag powder to prepare the cementing material, wherein the use amount of the modified fly ash is 10% of the weight of the cementing material, and the use amount of the slag powder is 15% of the weight of the cementing material.

Comparative example 1

In this comparative example, the modified fly ash was replaced with fly ash as compared to example 1.

Comparative example 2

This comparative example is a concrete in the market.

The compressive strength and the modulus of elasticity under compression of examples 1 to 4 and comparative examples 1 to 2 were measured after curing for 28 days, and the results are shown in the following table;

as can be seen from the above table, the compressive strength after 28 days of curing of examples 1-4 was 82.6-82.8MPa, and the compressive strength after 28 days of curing of comparative examples 1-2 was 38.5-72.1 MPa; comparative examples 1-2 have a modulus of elasticity under compression of 4.52X10 after 28 days of curing⁴-4.55X10⁴MPa, and the modulus of elasticity under compression of comparative examples 1-2 after 28 days of curing is 1.63X10⁴-2.85X10⁴MPa; the monomer on the surface of the modified fly ash can play a surface active role, the fluidity of a mixture formed in the preparation process of concrete can be increased, in the use process of the cementing material, the modified fly ash is hydrated and dehydrated to form a colloidal film layer which is distributed in the hardened concrete, defects and tiny cracks in the concrete can be filled, the bonding structure of a concrete aggregate-gel interface can be improved, and the mechanical strength of the prepared concrete can be further improved.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.

Claims (6)

1. The low-rubber high-flow-state high-performance concrete is characterized by comprising the following raw materials in parts by weight: 570 portions of 520-glass cement, 626-glass sand 702 portions, 1061-glass gravel 1152 portions, 130-glass water 140 portions and 4.88-8.67 portions of water reducer;

the low-rubber high-flow high-performance concrete is prepared by the following method:

adding the medium sand, the broken stone and the cementing material into a stirrer, stirring for 0.5-1.5min at the rotating speed of 40-60r/min to obtain a mixture, then sequentially adding water and a water reducing agent into the stirrer, and continuously stirring for 3-5min at the rotating speed to obtain the low-cement high-flow-state high-performance concrete.

2. The low-rubber high-flow-state high-performance concrete as claimed in claim 1, wherein the water reducing agent is a polycarboxylic acid water reducing agent, and the gravel is prepared by blending two grades of materials with the grain size of 5-10mm and 10-20mm according to the weight ratio of 1: 1.

3. The low-cementitious high-flow high-performance concrete according to claim 1, wherein the cementitious material is prepared by the following method:

step S1, adding acrylic acid and polyethylene glycol monomethyl ether into a three-neck flask, adding toluene, heating in a water bath at 45-50 ℃, magnetically stirring at a rotating speed of 100-;

step S2, adding the fly ash into absolute ethyl alcohol, stirring at a high speed of 500r/min for 400 plus one year for 30min to prepare a suspension, carrying out ultrasonic treatment on the suspension for 30min, controlling the power of the ultrasonic treatment to be 30-40min, centrifuging at a speed of 10000r/min for 3min at 8000 plus one year after the ultrasonic treatment is finished, adding the prepared filter residue into deionized water, repeating the steps, drying the prepared filter cake for 12h under the vacuum condition of 80-100 ℃ and-0.10 MPa of vacuum degree to prepare activated fly ash, and controlling the dosage ratio of the fly ash to the absolute ethyl alcohol to be 100 g: 500 mL;

step S3, adding the activated fly ash into a sodium hydroxide aqueous solution with the mass fraction of 20%, uniformly stirring for 5h, decompressing, filtering, washing to be neutral, adding filter residue into a sulfuric acid solution with the mass fraction of 10%, uniformly stirring for 4h, filtering, washing to be neutral, drying at 80-100 ℃ for 10h to obtain fly ash with a treated surface, adding the fly ash with the treated surface, hydroquinone, methylbenzene and KH560 into a three-neck flask, uniformly mixing, heating to 50-65 ℃, uniformly stirring, reacting for 10h, centrifuging, washing, and vacuum drying for 10h to obtain the treated fly ash;

step S4, adding the prepared treated fly ash into water according to the weight ratio of 1: 2, and uniformly dispersing to prepare a suspension for later use; adding the monomers into water according to the weight ratio of 1: 5, and uniformly dispersing to prepare a first solution; adding ammonium sulfate into water according to the weight ratio of 1: 50, and uniformly dispersing to prepare a second solution; then, simultaneously dripping the first solution and the second solution into the suspension for 2 hours, heating to 70-90 ℃ after dripping is finished, stirring at a constant speed, reacting for 3 hours, centrifuging and washing to obtain the modified fly ash, wherein the volume ratio of the suspension to the first solution to the second solution is controlled to be 1: 2;

and step S5, uniformly mixing the prepared modified fly ash, Portland cement and slag powder to prepare the cementing material, wherein the dosage of the modified fly ash is 5-15% of the weight of the cementing material, and the dosage of the slag powder is 5-15% of the weight of the cementing material.

4. The low-binder high-flow high-performance concrete as claimed in claim 3, wherein in step S5, the slag powder is grade S95, the strength grade of the portland cement is 52.5R, and the 28d mortar strength of the portland cement is not less than 1.1 times of the strength grade.

5. The low-binder high-flow-state high-performance concrete as claimed in claim 3, wherein the molar ratio of acrylic acid to polyethylene glycol monomethyl ether is controlled to be 1: 3 in step S1, the amount of hydroquinone is 3-5% of the mass of acrylic acid, the weight ratio of hydroquinone to p-toluenesulfonic acid is 2: 1, the amount ratio of activated fly ash, aqueous sodium hydroxide solution and sulfuric acid solution is controlled to be 50 g: 50mL in step S3, and the weight ratio of surface-treated fly ash, hydroquinone, toluene and KH560 is 10: 0.2: 20: 0.3-0.5.

6. The method for preparing the low-rubber high-flow-state high-performance concrete according to claim 1, which is characterized by comprising the following steps of:

adding the medium sand, the broken stone and the cementing material into a stirrer, stirring for 0.5-1.5min at the rotating speed of 40-60r/min to obtain a mixture, then sequentially adding water and a water reducing agent into the stirrer, and continuously stirring for 3-5min at the rotating speed to obtain the low-cement high-flow-state high-performance concrete.