Application of wheat bran plant polyphenol extract in preparation of mortar or concrete

Abstract

The invention relates to the technical field of material chemical industry, in particular to application of a wheat bran plant polyphenol extract in mortar or concrete preparation. The preparation method of the wheat bran plant polyphenol extract comprises the following steps: (1) drying and crushing wheat bran, soaking with an ethanol solution as an extracting agent, performing ultrasonic treatment to obtain an extracting solution, performing centrifugal treatment on the extracting solution, performing solid-liquid separation, and drying to obtain a crude extract; (2) dissolving the crude extract with ethanol, carrying out resin adsorption, then eluting with an ethanol solution, and carrying out vacuum concentration and drying on the eluent to obtain a wheat bran plant polyphenol purified product; the wheat bran plant polyphenol purified product is used as an additive for preparing cement mortar or concrete. On the basis of ensuring high extraction rate and purity of the wheat bran plant polyphenol extract, the wheat bran plant polyphenol extract is used as an additive to excite and activate regenerated micro powder or mineral admixtures used in mortar or concrete preparation, so that cement raw materials are partially replaced, and the mechanical property of mortar is improved.

Description

Technical Field

[0001] The invention relates to the technical field of material chemical engineering, and in particular to application of a wheat bran plant polyphenol extract in the preparation of mortar or concrete. Background Art

[0002] Plant polyphenols are mainly found in leaves, fruits, bark and wood of plants. They have multiple biological activities and medicinal values. Their molecular structure is complex, usually composed of multiple phenolic groups connected by acyl or ester bonds. They are widely used in medicine, food, cosmetics, leather making, metallurgy, printing and dyeing, mineral processing and other industries. Wheat bran is a by-product of wheat flour processing, accounting for about 20% to 30% of the whole grain. It is rich in phenolic compounds, and its value-added utilization has always been a research hotspot and difficult problem in the industry.

[0003] At present, cement and concrete are still the most widely used artificial materials in modern society. However, the production and application of cement lead to CO 2 Emissions account for 2.3% of global CO 2 8% of the total emissions. In order to reduce the negative environmental effects brought about by cement production and application and achieve sustainable development, it is imperative to prepare green, low-carbon and environmentally friendly mortar and concrete. In order to reduce the amount of cement used, the existing technology replaces part of the cement with admixtures to prepare mortar and concrete, which has a certain effect; admixtures include recycled micropowder, mineral admixtures (or auxiliary cementitious materials), etc. Recycled micropowder is a recycled aggregate processed from construction waste; mineral admixtures come from industrial waste, such as fly ash, slag, steel slag, etc., and also include some mineral resources, such as limestone, clay, etc. However, as a fine particle material with a particle size of less than 0.15 mm, recycled micropowder often has an adverse effect on the quality of the atmospheric environment due to its small particle size, low density, strong suspension and other characteristics, thereby posing potential health risks to human health. The presence of large amounts of silicon dioxide and calcium silicate hydrate results in the activity of recycled micropowder being far lower than that of cement. The material has a rough surface, loose structure, high impurity content, and high water absorption and porosity, which significantly reduce its practical application performance as an admixture. Fly ash is a mineral admixture with low activity. Currently, the utilization rate of adding it to cement is only about 20%. Slag, steel slag, etc. also generally have limited utilization.

[0004] Therefore, it is crucial to take appropriate measures to stimulate the activity of recycled micropowders or mineral admixtures in order to improve the performance of mortar, concrete, etc. For steel slag in mineral admixtures, researchers currently mainly use alkali excitation, composite excitation, acid excitation, and thermodynamic excitation to activate the activity of steel slag. Commonly used chemical reagents include sodium hydroxide, sodium carbonate, acetic acid, etc. However, most existing methods rely on strong alkali, strong acid, or high temperature conditions. These methods not only have operational risks and high costs, but are also difficult to directly apply to industrial production. In particular, there are currently no unified materials and methods for activating the activity of various admixtures, which limits the practical application of admixtures to partially replace cement in the preparation of mortar or concrete.

[0005] The present invention uses plant polyphenols extracted from wheat bran as an admixture and mixes it with recycled micropowder or mineral admixture to prepare an admixture that can replace part of the cement. The wheat bran plant polyphenols can effectively remove impurities in the recycled micropowder or mineral admixture and enhance their activity in a low-energy manner, thereby improving the utilization rate and application value of the recycled micropowder and mineral admixture and expanding their high-value applications in mortar and concrete. Summary of the invention

[0006] The present invention provides an application of a wheat bran plant polyphenol extract in the preparation of mortar or concrete, which makes full use of agricultural resources. On the basis of ensuring a high extraction rate and purity of the wheat bran plant polyphenol extract, the extract is used as an admixture to stimulate the activation of recycled micropowder or mineral admixture used in the preparation of mortar or concrete, thereby achieving partial substitution of cement raw materials, improving the mechanical properties of mortar, and solving the problems existing in the prior art.

[0007] The technical solution adopted by the present invention is:

[0008] Application of a wheat bran plant polyphenol extract in the preparation of mortar or concrete, the preparation steps of the wheat bran plant polyphenol extract are as follows:

[0009] (1) drying and crushing the wheat bran, soaking it in an ethanol solution as an extractant, and then ultrasonically treating it to obtain an extract, then centrifuging the extract to separate the solid and liquid, and drying it to obtain a crude extract;

[0010] (2) dissolving the crude extract with ethanol, adsorbing it with a resin, and then eluting it with an ethanol solution, concentrating and drying the eluate under vacuum to obtain a purified wheat bran plant polyphenol;

[0011] The above wheat bran plant polyphenol purified product is used as an admixture for preparing cement mortar or concrete.

[0012] Furthermore, the above-mentioned wheat bran plant polyphenol purification can improve the mechanical strength and durability of (recycled) mortar by increasing the activity of construction solid waste recycled micropowder and mineral admixtures.

[0013] Furthermore, after the purified wheat bran plant polyphenols are prepared into a wheat bran plant polyphenols solution with a mass concentration of 3%, they are mixed with recycled micropowder or mineral admixtures at a certain liquid-solid ratio to prepare an admixture for preparing cement mortar or concrete.

[0014] Furthermore, the above liquid-to-solid ratio is 1.5-2:1.

[0015] Furthermore, the admixture is prepared by mixing the wheat bran plant polyphenol solution with the regenerated micropowder or mineral admixture, stirring or ultrasonicating, and then drying; the stirring time is 3-5 hours, and the ultrasonication time is 60-120 minutes.

[0016] Furthermore, the admixture replaces part of cement with 10-20% of the cement content in mortar or concrete.

[0017] Furthermore, the cement mortar is prepared by drying the admixture and partially replacing cement with 10-20% of the admixture to prepare a cement paste, which is then put into a mold, vibrated, and moved into a standard curing room for curing for 28 days.

[0018] Furthermore, in step (1), the volume fraction of the ethanol solution is 50%-60%; the ethanol solution immersion temperature is 60-80°C, the ultrasonic treatment temperature is 45-65°C, and the ultrasonic time is 60-90 min; the extract centrifugal treatment conditions are: 5000-8000 r / min centrifugal speed 9-15 min; the ethanol used to dissolve the crude extract in step (2) adopts an ethanol solution with a volume fraction of 40%; the volume fraction of the ethanol solution used for elution is 30%.

[0019] Furthermore, the soaking time in step (1) is 10-20 days, preferably 15 days.

[0020] Furthermore, the mortar is composed of: standard sand, cement, recycled micro powder or mineral admixture, and water.

[0021] Furthermore, the concrete is composed of: standard sand, cement, crushed stone or pebble aggregate, recycled micro powder or mineral admixture, and water.

[0022] Furthermore, the mineral admixture is steel slag, fly ash, silica fume or slag, and the particle size is 1 to 200 μm.

[0023] Beneficial effects of the present invention:

[0024] 1. The purified wheat bran plant polyphenols of the present invention are prepared by drying and crushing the wheat bran raw material, extracting with water and alcohol, centrifuging and drying, using a macroporous adsorption resin, and concentrating in a vacuum, wherein the purity of the plant polyphenols can reach 80-95%. Not only is the product purity high, but the preparation process is simple and easy to operate.

[0025] 2. The purified wheat bran plant polyphenols of the present invention can be used as an admixture to react with recycled micropowder and mineral admixture components. After partially replacing cement, it has a chelating effect with the released ions of cement, can bind or cross-link hydration products, increase the density of local hydration products, and thus improve the compressive strength of mortar or concrete. When the replacement rate of recycled micropowder or mineral admixture activated by the above-mentioned admixture is 10% to 20%, the porosity of the mortar can be effectively reduced and the density of the mortar can be improved. The compressive strength of the cement mortar thus prepared is increased by up to 34.4% compared with the T0 group. Compared with the traditional strong acid and strong alkali excitation, the above method of activating mineral admixtures improves the activation effect and effectively reduces the preparation cost of mortar or concrete.

[0026] 3. The present invention makes full use of wheat bran raw materials, turns waste into treasure, and improves the comprehensive utilization value of wheat bran. The process of purifying wheat bran plant polyphenols is simple and the reagents used are safe and non-toxic, suitable for large-scale production, and has a very broad economic prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The FT-IR spectrum of wheat bran plant polyphenols prepared by the present invention;

[0028] Figure 2 The effect of wheat bran plant polyphenol treated regenerated micro powder prepared by the present invention on the compressive strength of cement mortar;

[0029] Figure 3 The invention discloses the influence of the regenerated micro powder treated with wheat bran plant polyphenols prepared by the present invention on the pore volume distribution of cement mortar. DETAILED DESCRIPTION

[0030] In order to clearly illustrate the technical features of this solution, the present invention is described in detail below through specific implementation methods and in combination with the accompanying drawings. In the embodiments of the present invention, unless otherwise specified, all parts and percentages are weight units, and the equipment and raw materials used can be purchased from the market or are commonly used in the art. The experimental methods, detection methods, etc. involved in the following embodiments, unless otherwise specified, are all conventional experimental methods, detection methods, etc. in the prior art. The following is a detailed description.

[0031] Example 1 Preparation of wheat bran plant polyphenol extract

[0032] A preparation method of a wheat bran plant polyphenol extract comprises the following steps:

[0033] S1 crude extraction:

[0034] (1) taking 1 kg of wheat bran, drying and crushing to obtain wheat bran powder;

[0035] (2) taking wheat bran powder, adding 20 L of 50% ethanol solution by volume as an extractant, soaking at 75° C., ultrasonically treating at 55° C. for 60 min, filtering, combining the filtrate, and obtaining an extract; wherein the soaking time is 15 days;

[0036] (3) The extract was transferred to a centrifuge tube, centrifuged at 5000 r / min for 9 min at room temperature to separate the solid and liquid, and the centrifuge tube was placed in a vacuum drying oven and dried for 24 h to obtain a crude extract;

[0037] S2 macroporous adsorption resin purification process:

[0038] (1) dissolving the crude extract obtained above in a 40% by volume ethanol solution, filtering to remove insoluble matter, and obtaining a macroporous adsorption resin loading solution;

[0039] (2) Macroporous adsorption resin loading: The macroporous adsorption resin loading solution obtained above was loaded onto the macroporous adsorption resin AB-8, the effluent flow rate was controlled to be 1.5 mL / min, and the volume ratio of the macroporous adsorption resin loading solution to the macroporous adsorption resin AB-8 was 2:1;

[0040] (3) Elution of the macroporous adsorption resin: first wash away impurities with water, then elute with 30% by volume ethanol, and collect the eluate;

[0041] (4) The eluate obtained in step (3) is vacuum concentrated and dried to obtain a purified wheat bran plant polyphenol with a purity of 94.1%. Figure 1 , is the FT-IR spectrum of the wheat bran plant polyphenols.

[0042] The purified wheat bran plant polyphenols prepared in Example 1 were used to prepare solutions with different mass concentrations of 0.1%, 0.3%, and 0.5%, to obtain wheat bran plant polyphenol solutions. The wheat bran plant polyphenol solutions with different mass concentrations were mixed with regenerated micropowder or mineral admixture at a liquid-solid ratio of 1.5, stirred for 4 hours, and then taken out and dried to obtain active regenerated micropowder or active mineral admixture, which was used to prepare cement mortars of Examples 2 to 7, and the compressive strength of the mortars was tested.

[0043] Among them, the water-cement ratio of cement mortar is 0.5, the mortar-sand ratio is 3, and the sand is standard sand.

[0044] The experiment set up control group, T0 group, T1 group, T3 group and T5 group: the control group was cement mortar with pure cement; the T0 group was mortar made by replacing part of cement with recycled micro powder / mineral admixture without activation treatment;

[0045] Groups T1, T3 and T5 are cement mortars made by replacing part of the cement with active regenerated micropowder / active mineral admixtures obtained by activation treatment with wheat bran plant polyphenol solutions of different mass concentrations of 0.1%, 0.3% and 0.5%.

[0046] Example 2 Preparation of cement mortar using activated regenerated micropowder of wheat bran plant polyphenols

[0047] The raw material ratios of each group of mortar in this embodiment are as follows:

[0048] Table 1

[0049]

[0050] The 28-day compressive strength test was carried out on the mortars of the control group and T0, T1, T3, and T5 groups in Table 1. Figure 2 By comparison, the compressive strength of cement mortar in group T0 was 8.2% lower than that in group C, while the compressive strength of cement mortar in groups T1, T3 and T5 was 7.9%, 19.6% and 2.6% higher than that in group T0, respectively, which proved the effectiveness of activated regenerated micropowder of wheat bran plant polyphenols. Moreover, the compressive strength of mortar made of activated regenerated micropowder activated by adding 0.3% wheat bran plant polyphenols solution was higher than that in group C and group T0.

[0051] The "control group" in the following Tables 2 to 5 is the same as the "control group" in Example 2, and the test results of the control group are compared with the test results in Example 2.

[0052] Example 3 Preparation of cement mortar using wheat bran plant polyphenols activated steel slag

[0053] The raw material ratios of each group of mortar in this embodiment are shown in Table 2 below. The activated steel slag group uses the steel slag activated with 0.3% wheat bran plant polyphenol solution from group T3.

[0054] Table 2

[0055]

[0056]

[0057] The 28-day compressive strength test was conducted on the mortars of groups T0 and T3 in Table 2. By comparison, the compressive strength of the cement mortar of group T3 increased by 14.9% compared with that of group T0.

[0058] Compared with the compressive strength test results of the control group in Example 2, the compressive strength of the cement mortar in group T3 of this example increased by 10.6% over that of the control group.

[0059] Example 4 Preparation of cement mortar using wheat bran plant polyphenols activated fly ash

[0060] The raw material ratios of each group of mortar in this embodiment are shown in Table 3 below. The activated fly ash group uses the fly ash from group T3 activated with 0.3% wheat bran plant polyphenol solution.

[0061] Table 3

[0062]

[0063] The compressive strength test of the mortars of groups T0 and T3 in Table 3 was carried out for 28 days. By comparison, the compressive strength of the cement mortar of group T3 increased by 27.4% compared with that of group T0.

[0064] Compared with the compressive strength test results of the control group in Example 2, the compressive strength of the cement mortar in group T3 of this example increased by 19.7% over that of the control group.

[0065] Example 5 Preparation of cement mortar using wheat bran plant polyphenols activated silica fume

[0066] The raw material ratios of each group of mortar in this embodiment are shown in Table 4 below. The activated silica fume group selects the silica fume activated with 0.3% wheat bran plant polyphenol solution from group T3.

[0067] Table 4

[0068]

[0069] The 28-day compressive strength test was conducted on the mortars of groups T0 and T3 in Table 4. By comparison, the compressive strength of the cement mortar of group T3 increased by 34.4% compared with that of group T0.

[0070] Compared with the compressive strength test results of the control group in Example 2, the compressive strength of the cement mortar in group T3 of this example increased by 38.9% over that of the control group.

[0071] Example 6 Preparation of cement mortar using wheat bran plant polyphenol activated slag

[0072] The raw material ratios of each group of mortar in this embodiment are shown in Table 5 below. The activated slag group uses the slag from group T3 activated with 0.3% wheat bran plant polyphenol solution.

[0073] Table 5

[0074]

[0075] The 28-day compressive strength test was conducted on the mortars of groups T0 and T3 in Table 5. By comparison, the compressive strength of the cement mortar of group T3 increased by 29.4% compared with that of group T0.

[0076] Compared with the compressive strength test results of the control group in Example 2, the compressive strength of the cement mortar in group T3 of this example increased by 23.9% over that of the control group.

[0077] Example 7 Pore structure of the wheat bran plant polyphenol cement-based composite material of the present invention

[0078] The cement mortar prepared in Example 2 was selected to carry out a porosity test at 28 days. Figure 3 ,The results show that the pore structure distribution of cement mortar in group T3 is the most ,dense.

[0079] 1. Investigation of the effect of the treatment method of the wheat bran plant polyphenol solution on the 28-day compressive strength when activating the regenerated micropowder or mineral admixture

[0080] As in the aforementioned Examples 2-7, during activation, "wheat bran plant polyphenol solutions of different mass concentrations are mixed with regenerated micropowder or mineral admixtures at a liquid-to-solid ratio of 1.5, stirred for 4 hours, and then taken out and dried" is adopted; now only this treatment method is adjusted, and taking the preparation of T3 group cement mortar as an example, "0.3% wheat bran plant polyphenol solution is mixed with regenerated micropowder or mineral admixture at a liquid-to-solid ratio of 1.5, ultrasonicated for 90 minutes, and then taken out and dried" is used to prepare cement mortar, and the compressive strength of the mortar after 28 days is tested.

[0081] As a result, the compressive strength of cement mortar in group T0 after the above treatment was 9.7% lower than that in the control group, and the compressive strength of cement mortar in group T3 was 17.6% higher than that in T0, corresponding to the results of group T3 in Example 3, the compressive strength of cement mortar was 12.6% higher than that in T0, corresponding to the results of group T3 in Example 4, the compressive strength of cement mortar was 22.9% higher than that in T0, corresponding to the results of group T3 in Example 5, the compressive strength of cement mortar was 27.7% higher than that in T0, and corresponding to the results of group T3 in Example 6, the compressive strength of cement mortar was 23.6% higher than that in T0. It can be seen that compared with the ultrasonic treatment method, direct stirring has a more obvious improvement in the compressive strength of cement mortar, but both have achieved an improvement in compressive strength compared with the control group.

[0082] 2. Investigation of the influence of preparation methods on the purity of plant polyphenols in wheat bran

[0083] Example 8

[0084] A preparation method of a wheat bran plant polyphenol extract comprises the following steps:

[0085] (1) taking 1 kg of wheat bran, drying and crushing to obtain wheat bran powder;

[0086] (2) Take wheat bran powder, add 10L of 50% ethanol solution as an extractant, soak at 75°C, ultrasonically treat at 55°C for 60 minutes, filter, combine the filtrate, and obtain an extract; the soaking time is 15 days.

[0087] (3) The extract was transferred to a centrifuge tube, centrifuged at 5000 r / min for 9 min at room temperature to separate the solid and liquid, and the centrifuge tube was placed in a vacuum drying oven and dried for 24 h to obtain a crude extract;

[0088] (4) dissolving the crude extract obtained in step (3) with a 40% by volume ethanol solution, filtering to remove insoluble matter, and obtaining a macroporous adsorption resin loading solution; loading the macroporous adsorption resin loading solution on a non-polar macroporous adsorption resin column, selecting a sample flow rate of 1.5 mL / min, controlling the loading solution concentration at 5 mg / mL, and the volume ratio of the macroporous adsorption resin loading solution to the macroporous adsorption resin AB-8 is 2:1, and eluting with 20%, 30%, and 40% by volume ethanol solutions, respectively, and collecting the eluate;

[0089] (5) The eluate obtained in step (4) was vacuum concentrated and dried to obtain the purified wheat bran plant polyphenols with purities of 62.7%, 94.1% and 52.8% respectively.

[0090] Example 9

[0091] The preparation steps of the wheat bran plant polyphenol extract are the same as those of Example 8, except that the volume fraction of the ethanol solution used in step (2) is 60%. The purity of the purified wheat bran plant polyphenols obtained by the preparation is 58.4%, 92.7% and 62.8% respectively.

[0092] Example 10

[0093] The preparation steps of the wheat bran plant polyphenol extract are the same as those of Example 8, except that the volume fraction of the ethanol solution used in step (2) is 40%. The purity of the purified wheat bran plant polyphenols obtained by the preparation is 41.8%, 83.2% and 35.6% respectively.

[0094] Therefore, when preparing the wheat bran plant polyphenol extract, the extractant ethanol solution in step (2) is preferably selected with a volume fraction of 50%-60%, preferably 50% purity; the elution ethanol solution in step (4) is preferably selected with a volume fraction of 30%. Combined with the results of Example 1, when the volume fraction of the ethanol solution in step (2) remains unchanged (50%), the amount of ethanol solution is increased (20L), and the effect on the purity of the purified wheat bran plant polyphenol can be ignored.

[0095] Embodiment 11

[0096] The preparation steps of the wheat bran plant polyphenol extract are the same as those of Example 8, except that the soaking days in step (2) are adjusted to 10 days and 20 days; in step (4), a 30% volume fraction ethanol solution is directly used for elution, and the eluate is collected; the purity of the prepared wheat bran plant polyphenol purified product is 89.5% and 94.9%, respectively. It can be seen that the effect of increasing the soaking days beyond 15 days on the purity improvement is limited. Based on the consideration of economy and test cycle, 15 days is appropriate.

[0097] The above specific implementation manner cannot be used as a limitation on the protection scope of the present invention. For those skilled in the art, any substitution, improvement or change made to the implementation manner of the present invention falls within the protection scope of the present invention.

[0098] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. An application of a wheat bran plant polyphenol extract in the preparation of mortar or concrete, characterized in that: The preparation steps of the wheat bran plant polyphenol extract are as follows: (1) drying and crushing the wheat bran, soaking it in an ethanol solution as an extractant, and then ultrasonically treating it to obtain an extract, then centrifuging the extract to separate the solid and liquid, and drying it to obtain a crude extract; (2) dissolving the crude extract with ethanol, adsorbing it with a resin, and then eluting it with an ethanol solution, concentrating and drying the eluate under vacuum to obtain a purified wheat bran plant polyphenol; The above wheat bran plant polyphenol purified product is used as an admixture for preparing cement mortar or concrete.

2. The use of the wheat bran plant polyphenol extract in the preparation of mortar or concrete according to claim 1, characterized in that: After the purified wheat bran plant polyphenols are prepared into a wheat bran plant polyphenols solution with a mass concentration of 3%, the solution is mixed with recycled micro powder or mineral admixture at a certain liquid-solid ratio to prepare an admixture for preparing cement mortar or concrete.

3. The use of the wheat bran plant polyphenol extract in the preparation of mortar or concrete according to claim 2, characterized in that: The above liquid-to-solid ratio is 1.5-2:

1.

4. The use of the wheat bran plant polyphenol extract in the preparation of mortar or concrete according to claim 2, characterized in that: The preparation of the admixture is as follows: the wheat bran plant polyphenol solution is mixed with the regenerated micro powder or mineral admixture, stirred or ultrasonicated, and then dried; the stirring time is 3-5 hours, and the ultrasonication time is 60-120 minutes.

5. The use of the wheat bran plant polyphenol extract in the preparation of mortar or concrete according to claim 2, characterized in that: The admixture replaces part of cement with 10-20% of the cement used in mortar or concrete.

6. The use of the wheat bran plant polyphenol extract in the preparation of mortar or concrete according to claim 2, characterized in that: The cement mortar is prepared by drying the admixture and partially replacing cement with 10-20% of the admixture to prepare a cement paste, which is then put into a mold, vibrated, and moved into a standard curing room for curing for 28 days.

7. Use of the wheat bran plant polyphenol extract according to any one of claims 1 to 6 in the preparation of mortar or concrete, characterized in that: In step (1), the volume fraction of the ethanol solution is 50%-60%, and the soaking temperature of the ethanol solution is 60-80°C; the ultrasonic treatment temperature is 45-65°C, and the ultrasonic treatment time is 60-90min; the centrifugal treatment conditions of the extract are: centrifugation at a speed of 5000-8000r / min for 9-15min; the ethanol used to dissolve the crude extract in step (2) adopts an ethanol solution with a volume fraction of 40%; the volume fraction of the ethanol solution used for elution is 30%.

8. The use of the wheat bran plant polyphenol extract in the preparation of mortar or concrete according to claim 7, characterized in that: The soaking time in step (1) is 10-20 days.

9. The use of the wheat bran plant polyphenol extract according to any one of claims 1 to 6 in the preparation of mortar or concrete, characterized in that: The mortar is composed of standard sand, cement, recycled micro powder or mineral admixture, and water.

10. The use of the wheat bran plant polyphenol extract in the preparation of mortar or concrete according to claim 9, characterized in that: The mineral admixture is steel slag, fly ash, silica ash or slag, and the particle size is 1-200 μm.

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