1. A high-strength concrete doped with granite powder comprises the following components in parts by weight: 300-500 parts of cement, 100-120 parts of granite micro powder, 90-110 parts of water and 5-10 parts of polycarboxylic acid water reducing agent, and is characterized by further comprising: 30-50 parts of a laponite composite material and 8-15 parts of a foaming master batch.

2. The granite stone powder-doped high-strength concrete as claimed in claim 1, wherein the preparation of the laponite composite material comprises the following steps: according to the mass ratio of 1: 12-20 taking the laponite and water, uniformly mixing at 50-70 ℃, adding glass micropowder 2-5 times the mass of the laponite and dodecyl dimethyl betaine 0.1-0.3 time the mass of the laponite, mixing, cooling to 20-40 ℃, uniformly mixing, removing water to obtain a dried substance, and taking the dried substance according to the mass ratio of 5-8: 0.1-0.2, adding the water-containing mineral aggregate, mixing and grinding to obtain the laponite composite material.

3. The granite stone powder-doped high-strength concrete as claimed in claim 2, wherein the aqueous mineral aggregate is: mirabilite and alum are mixed according to a mass ratio of 4-8: 1 in the composition of claim 1.

4. The granite stone powder-doped high-strength concrete as claimed in claim 2, wherein the specific surface area of the glass micropowder is 300-400 m²Per kg, the average particle diameter is 25 to 30 μm.

5. The granite stone powder-doped high-strength concrete as claimed in claim 2, wherein the mean particle size of the laponite is 40-60 nm.

6. The granite stone powder-doped high-strength concrete as claimed in claim 1, wherein the foaming master batch has a particle size of 1-2 mm and a density of 1.3-1.4 g/cm³。

7. The granite stone powder-doped high-strength concrete as claimed in claim 1 or 6, wherein the foaming master batch contains sodium bicarbonate and lecithin, and the mass of the foaming master batch is 20-30% and 3-7% respectively.

8. The preparation method of the granite stone powder-doped high-strength concrete as claimed in any one of claims 1 to 7, characterized by comprising the following steps:

(1) according to the mass parts, 300-500 parts of cement, 100-120 parts of granite micro powder, 30-50 parts of a laponite composite material, 90-110 parts of water, 8-15 parts of foaming master batches and 5-10 parts of a polycarboxylic acid water reducing agent;

(2) adding the weighed cement, granite micro powder and laponite composite material into a concrete mixer, and pre-mixing to obtain a premix;

(3) uniformly mixing water and a polycarboxylic acid water reducing agent, adding the mixture into a premix, stirring and standing; and (3) injecting the stirred concrete mixture into a mould, performing insertion and tamping molding, exhausting bubbles, and scraping the surface.

Background

Concrete is the most important building material at home and abroad in the present country, the annual output of the concrete in China is increased day by day, the annual demand of the cement is continuously increased due to mass production of the concrete, and the cement production can discharge a large amount of waste gas to cause environmental pollution. Currently, in order to solve the environmental problems, national policies are correspondingly adjusted, wherein the emission of coal-fired enterprises is limited as a main means, so that the yield of cement and fly ash used as a cement substitute is reduced, and a new mineral admixture is urgently needed to replace fly ash to be doped into concrete as a cement substitute so as to solve the problem of insufficient supply of concrete raw materials.

China has abundant and widely distributed granite reserves, and is often processed into various building decoration materials. The granite generates a lot of waste materials in the cutting and polishing processes, the accumulation of the waste granite pollutes the environment, and meanwhile, the waste of granite resources is caused, and the problem that the granite waste materials are mixed into concrete becomes a topic with great research value.

However, the concrete compressive strength is reduced due to the fact that the activity of the granite volcanic ash is low, and the concrete compressive strength is reduced due to the fact that the content of the granite volcanic ash is too high, and many researches show that the content of the single-doped granite powder cannot exceed 20%, and the concrete compressive strength cannot be greatly influenced at the moment. Patent CN201610955373.3 provides a preparation granite composite powder concrete, under the prerequisite of guaranteeing the concrete strength, the output of abandonment resources such as granite mountain flour of maximize to solve the environmental pollution problem that waste material piles up the etc. and cause, but its early strong effect remains to promote.

Disclosure of Invention

The invention provides high-strength concrete doped with granite powder and a preparation method thereof, which ensure the strength of the concrete, fully utilize resources such as waste granite and the like and have good early-strength effect.

The invention adopts the following technical scheme.

A high-strength concrete doped with granite powder comprises the following components in parts by weight: 300-500 parts of cement, 100-120 parts of granite micro powder, 90-110 parts of water, 5-10 parts of polycarboxylic acid water reducing agent, and the cement-based water reducing agent further comprises: 30-50 parts of a laponite composite material and 8-15 parts of a foaming master batch.

Further, the preparation of the laponite composite material comprises the following steps: according to the mass ratio of 1: 12-20 taking the laponite and water, uniformly mixing at 50-70 ℃, adding glass micropowder 2-5 times the mass of the laponite and dodecyl dimethyl betaine 0.1-0.3 time the mass of the laponite, mixing, cooling to 20-40 ℃, uniformly mixing, removing water to obtain a dried substance, and taking the dried substance according to the mass ratio of 5-8: 0.1-0.2, adding the water-containing mineral aggregate, mixing and grinding to obtain the laponite composite material.

According to the invention, the laponite with negative charges is matched with the glass micro powder to form a dynamic colloid structure in a system, so that the pore concrete is filled, and the water is contained to improve the internal fluidity while the overall strength is stably improved; under the condition of water, the laponite forms gel, so that the glass micropowder and the dodecyl dimethyl betaine can be effectively wrapped, the cohesive force and the internal friction angle in a system are improved, the mechanical property of the concrete is greatly improved, and meanwhile, due to the addition of negative charges and the amphiphilic surfactant, the fluidity of a concrete mixture can be improved, and the early strength effect is improved.

Further, the water-containing mineral aggregate is: mirabilite and alum are mixed according to a mass ratio of 4-8: 1 in the composition of claim 1. The mineral with a plurality of crystal water is doped in the mineral, so that the sulfate can accelerate hydration of tricalcium silicate, and the heated water loss along with cement hydration can be realized in the using process, so that the dispersion of the negatively charged laponite is facilitated, the fluidity in a concrete system is improved, the formation of a cement slurry structure is accelerated, and the development of early strength is facilitated.

Furthermore, the specific surface area of the glass micro powder is 300-400 m²Per kg, the average particle diameter is 25 to 30 μm. The high specific surface area and the low average grain diameter ensure the fluidity of the interior of concrete in the using process, accelerate hydration and improve the early strength effect.

Further, the average particle size of the laponite is 40-60 nm.

Further, the particle size of the foaming master batch is 1-2 mm, and the density is 1.3-1.4 g/cm³。

Further, the foaming master batch contains sodium bicarbonate and lecithin, and the mass of the foaming master batch is 20-30% and 3-7% respectively.

When the added foaming master batch contains sodium bicarbonate which can be used for the concrete, the foaming master batch is heated to decompose and release CO₂Improves the internal hydration and dispersion effect, and the contained lecithin component can also provide amphipathy,along with the production of bubble acts on inside the concrete, dispersion effect is good, stably provides early strong effect.

A preparation method of high-strength concrete doped with granite powder comprises the following steps.

(1) The foaming agent comprises, by mass, 300-500 parts of cement, 100-120 parts of granite micropowder, 30-50 parts of a laponite composite material, 90-110 parts of water, 8-15 parts of foaming master batches and 5-10 parts of a polycarboxylic acid water reducing agent.

(2) And adding the weighed cement, granite micro powder and the laponite composite material into a concrete mixer, and pre-mixing to obtain the premix.

(3) Uniformly mixing water and a polycarboxylic acid water reducing agent, adding the mixture into a premix, stirring and standing; and (3) injecting the stirred concrete mixture into a mould, performing insertion and tamping molding, exhausting bubbles, and scraping the surface.

The invention has the beneficial effects.

The invention can well utilize resources such as granite and the like while ensuring the strength of concrete, improves the fluidity of the interior of a concrete system, accelerates the formation of a cement paste structure, is beneficial to the development of early strength, and has excellent mechanical properties through test detection.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.

A high-strength concrete doped with granite powder comprises the following components in parts by weight: 300-500 parts of cement, 100-120 parts of granite micro powder, 30-50 parts of a laponite composite material, 90-110 parts of water, 8-15 parts of foaming master batch and 5-10 parts of a polycarboxylic acid water reducing agent.

The preparation method of the diatomite composite material comprises the following steps: according to the mass ratio of 1: 12-20 taking the laponite and water, uniformly mixing at 50-70 ℃, adding glass micropowder 2-5 times the mass of the laponite and dodecyl dimethyl betaine 0.1-0.3 time the mass of the laponite, mixing, cooling to 20-40 ℃, uniformly mixing, removing water by reduced pressure evaporation to obtain a dried substance, and taking the dried substance according to the mass ratio of 5-8: 0.1-0.2, adding the water-containing mineral aggregate, mixing and grinding for 2-3 hours to obtain the laponite composite material.

The water-containing mineral aggregate is: mirabilite and alum are mixed according to a mass ratio of 4-8: 1 in the composition of claim 1.

The specific surface area of the glass micro powder is 300-400 m²Per kg, the average particle diameter is 25 to 30 μm.

The particle size of the foaming master batch is 1-2 mm, and the density is 1.3-1.4 g/cm³. The foaming master batch contains sodium bicarbonate and lecithin, and the mass of the foaming master batch is 20-30% and 3-7% respectively.

The average particle size of the laponite is 40-60 nm.

A preparation method of high-strength concrete doped with granite powder comprises the following steps.

(1) The foaming agent comprises, by mass, 300-500 parts of cement, 100-120 parts of granite micropowder, 30-50 parts of a laponite composite material, 90-110 parts of water, 8-15 parts of foaming master batches and 5-10 parts of a polycarboxylic acid water reducing agent.

(2) And adding the weighed cement, granite micro powder and laponite composite material into a concrete mixer, and pre-mixing for 5-10 min to obtain the premix.

(3) Uniformly mixing water and a polycarboxylic acid water reducing agent, adding the mixture into a premix, stirring for 3-10 min, and standing for 40-60 min; and (3) injecting the stirred concrete mixture into a mould, performing insertion and tamping molding, exhausting bubbles, and scraping the surface.

Example 1.

A high-strength concrete doped with granite powder comprises the following components in parts by weight: 300 parts of cement, 100 parts of granite micro powder, 30 parts of a laponite composite material, 90 parts of water, 8 parts of foaming master batches and 5 parts of a polycarboxylic acid water reducing agent.

The preparation method of the diatomite composite material comprises the following steps: according to the mass ratio of 1: and 12, uniformly mixing the laponite and water at 50 ℃, adding glass micropowder 2-5 times the mass of the laponite and dodecyl dimethyl betaine 0.1 time the mass of the laponite, mixing, cooling to 20 ℃, uniformly mixing, removing water by reduced pressure evaporation to obtain a dried substance, and taking the dried substance according to the mass ratio of 5: 0.1, adding the water-containing mineral aggregate, mixing and grinding for 2-3 hours to obtain the laponite composite material.

The water-containing mineral aggregate is: mirabilite and alum are mixed according to a mass ratio of 4-8: 1 in the composition of claim 1.

The specific surface area of the glass micro powder is 300-400 m²Per kg, the average particle diameter is 25 to 30 μm.

The particle size of the foaming master batch is 1-2 mm, and the density is 1.3-1.4 g/cm³. The foaming master batch contains sodium bicarbonate and lecithin, and the contents of the sodium bicarbonate and the lecithin are respectively 20% and 3% of the mass of the foaming master batch.

The average particle size of the laponite is 40-60 nm.

A preparation method of high-strength concrete doped with granite powder comprises the following steps.

(1) The concrete comprises, by mass, 300 parts of cement, 100 parts of granite micropowder, 30 parts of a laponite composite material, 90 parts of water, 8 parts of foaming master batches and 5 parts of a polycarboxylic acid water reducing agent.

(2) And adding the weighed cement, granite micro powder and laponite composite material into a concrete mixer, and pre-mixing for 5min to obtain the premix.

(3) Uniformly mixing water and a polycarboxylic acid water reducing agent, adding the mixture into a premix, stirring for 3min, and standing for 40 min; and (3) injecting the stirred concrete mixture into a mould, performing insertion and tamping molding, exhausting bubbles, and scraping the surface.

Example 2.

A high-strength concrete doped with granite powder comprises the following components in parts by weight: 500 parts of cement, 120 parts of granite micro powder, 50 parts of a laponite composite material, 110 parts of water, 15 parts of foaming master batches and 10 parts of a polycarboxylic acid water reducing agent.

The preparation method of the diatomite composite material comprises the following steps: according to the mass ratio of 1: 20, uniformly mixing the laponite and water at 70 ℃, adding glass micropowder 5 times the mass of the laponite and dodecyl dimethyl betaine 0.3 times the mass of the laponite, mixing, cooling to 40 ℃, uniformly mixing, and evaporating under reduced pressure to remove water to obtain a dried substance, wherein the dried substance is prepared by mixing the following components in a mass ratio of 8: 0.2, adding the water-containing mineral aggregate, mixing and grinding for 3 hours to obtain the laponite composite material.

The water-containing mineral aggregate is: mirabilite and alum are mixed according to the mass ratio of 8: 1 in the composition of claim 1.

The specific surface area of the glass micro powder is 300-400 m²Per kg, the average particle diameter is 25 to 30 μm.

The particle size of the foaming master batch is 1-2 mm, and the density is 1.3-1.4 g/cm³. The foaming master batch contains sodium bicarbonate and lecithin, and the contents of the sodium bicarbonate and the lecithin are respectively 30% and 7% of the mass of the foaming master batch.

The average particle size of the laponite is 40-60 nm.

A preparation method of high-strength concrete doped with granite powder comprises the following steps.

(1) According to the mass parts, 500 parts of cement, 120 parts of granite micro powder, 50 parts of a laponite composite material, 110 parts of water, 15 parts of foaming master batches and 10 parts of a polycarboxylic acid water reducing agent.

(2) And adding the weighed cement, granite micro powder and laponite composite material into a concrete mixer, and pre-mixing for 10min to obtain the premix.

(3) Uniformly mixing water and a polycarboxylic acid water reducing agent, adding the mixture into a premix, stirring for 10min, and standing for 60 min; and (3) injecting the stirred concrete mixture into a mould, performing insertion and tamping molding, exhausting bubbles, and scraping the surface.

Example 3.

A high-strength concrete doped with granite powder comprises the following components in parts by weight: 400 parts of cement, 110 parts of granite micro powder, 30 parts of a laponite composite material, 100 parts of water, 12 parts of foaming master batches and 8 parts of a polycarboxylic acid water reducing agent.

The preparation method of the diatomite composite material comprises the following steps: according to the mass ratio of 1: uniformly mixing the spodumene and water at 60 ℃, adding glass micropowder 3 times the mass of the spodumene and dodecyl dimethyl betaine 0.2 times the mass of the spodumene, mixing, cooling to 30 ℃, uniformly mixing, evaporating under reduced pressure to remove water to obtain a dried substance, and taking the dried substance according to the mass ratio of 6: 0.1, adding the water-containing mineral aggregate, mixing and grinding for 2 hours to obtain the laponite composite material.

The water-containing mineral aggregate is: mirabilite and alum are mixed according to the mass ratio of 6: 1 in the composition of claim 1.

The glass powder isThe specific surface area is 300-400 m²Per kg, the average particle diameter is 25 to 30 μm.

The particle size of the foaming master batch is 1-2 mm, and the density is 1.3-1.4 g/cm³. The foaming master batch contains sodium bicarbonate and lecithin, and the contents of the sodium bicarbonate and the lecithin are respectively 25% and 5% of the mass of the foaming master batch.

The average particle size of the laponite is 40-60 nm.

A preparation method of high-strength concrete doped with granite powder comprises the following steps.

(1) According to the mass parts, 400 parts of cement, 110 parts of granite micro powder, 30 parts of a laponite composite material, 100 parts of water, 12 parts of foaming master batches and 8 parts of a polycarboxylic acid water reducing agent are taken.

(2) And adding the weighed cement, granite micro powder and laponite composite material into a concrete mixer, and pre-mixing for 8min to obtain the premix.

(3) Uniformly mixing water and a polycarboxylic acid water reducing agent, adding the mixture into a premix, stirring for 7min, and standing for 50 min; and (3) injecting the stirred concrete mixture into a mould, performing insertion and tamping molding, exhausting bubbles, and scraping the surface.

Comparative example 1: essentially identical to the protocol of example 1, the only difference is the absence of a foaming masterbatch.

Comparative example 2: essentially identical to the protocol of example 1, the only difference is the absence of the laponite composite.

Comparative example 3: a certain brand early strength concrete (main components of ordinary silicon cement, triethanolamine, triisopropanolamine and glass slag) in Nanjing City.

Comparative example 4: concrete obtained according to example 6 disclosed in patent CN 201610955373.3.

The concrete obtained in examples 1 to 3 and comparative examples 1 to 3 was subjected to the mechanical property test specified in GB50081-2002, and the test results are shown in the following table.

As can be seen from the above table, the concrete obtained in the embodiments 1-3 is better than the concrete obtained in the comparative examples 3 and 4 in the above three performance tests, and the concrete obtained in the comparative examples 1 and 2 can cause the mechanical performance to be reduced to different degrees when partial components are absent.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.