阅读说明：本技术 一种高抗折强度的超高性能混凝土及其制备方法 (Ultrahigh-performance concrete with high breaking strength and preparation method thereof ) 是由 吴玉友 鲁权 陈松 刘长江 于 2021-07-07 设计创作，主要内容包括：本发明属于建筑材料技术领域,公开了一种高抗折强度的超高性能混凝土及其制备方法。该超高性能混凝土,按重量份计,包括氧化石墨烯、金属纤维、胶凝材料1020-1035份、砂1122-1139份；胶凝材料包括水泥613-620份、硅灰152.75-155.5份、粉煤灰204-207份和矿渣粉50.25-52.5份；氧化石墨烯的含量为所述凝胶材料的重量的0.01-0.3％；金属纤维的体积为所述超高性能混凝土的体积的1.2-2.5％。该超高性能混凝土的制备过程中使用出料口高度不超过10mm的装置,改善金属纤维在超高性能混凝土中的定向分布,从而显著提高了超高性能混凝土的抗折强度和抗高温、低温性能,整体上显著提高了超高性能混凝土的机械性能和耐候性。(The invention belongs to the technical field of building materials, and discloses high-breaking-strength ultrahigh-performance concrete and a preparation method thereof. The ultrahigh-performance concrete comprises, by weight, 1035 parts of graphene oxide, metal fibers, 1020-type cementing materials and 1139-type sand; the cementing material comprises 620 parts of cement 613-containing materials, 152.75-155.5 parts of silica fume, 207 parts of fly ash 204-containing materials and 50.25-52.5 parts of slag powder; the content of the graphene oxide is 0.01-0.3% of the weight of the gel material; the volume of the metal fiber is 1.2-2.5% of the volume of the ultra-high performance concrete. In the preparation process of the ultra-high performance concrete, a device with the height of a discharge port not more than 10mm is used, and the directional distribution of metal fibers in the ultra-high performance concrete is improved, so that the breaking strength, the high temperature resistance and the low temperature resistance of the ultra-high performance concrete are obviously improved, and the mechanical property and the weather resistance of the ultra-high performance concrete are integrally and obviously improved.)

1. The ultra-high performance concrete is characterized by comprising, by weight, graphene oxide, metal fibers, a cementing material 1020-;

the cementing material comprises 620 parts of cement 613-;

the content of the graphene oxide is 0.01-0.3% of the weight of the gel material;

the volume of the metal fiber is 1.2-2.5% of the volume of the ultra-high performance concrete.

2. The ultra-high performance concrete as claimed in claim 1, wherein the cementitious material comprises 618 parts of cement 615-, 153.75-154.5 parts of silica fume, 206 parts of fly ash 205-and 51.25-51.5 parts of slag powder.

3. The ultra-high performance concrete of claim 1, wherein the graphene oxide is nano graphene oxide sheets; the thickness of the lamella of the nano graphene oxide sheet is 0.5-2.5nm, and the diameter of the lamella is 0.5-12 μm.

4. The ultra-high performance concrete according to claim 1, wherein the metal fibers are steel fibers; the length of the steel fiber is 11-18mm, and the diameter of the steel fiber is 0.16-0.28 mm.

5. The ultra high performance concrete of claim 4, wherein the steel fibers have a length of 12-16mm and a diameter of 0.18-0.25 mm.

6. The ultra-high performance concrete of claim 1, wherein the sand is quartz sand; the sand comprises coarse quartz sand, medium quartz sand and fine quartz sand; the particle size of the coarse-particle quartz sand is 0.85-2 mm; the particle size of the medium-particle quartz sand is 0.425-0.85 mm; the particle size of the fine quartz sand is 0.212-0.425 mm.

7. The ultra-high performance concrete according to any one of claims 1 to 6, further comprising a solvent, a water reducing agent.

8. The method for preparing the ultra-high performance concrete according to any one of claims 1 to 6, comprising the steps of:

the slurry formed by the components is poured into a device with the height of a discharge port not exceeding 10 mm.

9. The method for preparing ultra-high performance concrete according to claim 8, comprising the steps of:

(1) and (3) dispersion treatment of graphene oxide: mixing the graphene oxide with a solvent to prepare a graphene oxide solution, then adding a water reducing agent, and mixing to prepare a mixed solution;

(2) stirring and mixing the cementing material and the sand, then adding the rest components, stirring and mixing to prepare slurry; and pouring the slurry into a device with a discharge port not more than 10mm in height, pouring the slurry flowing out of the device into a mould, compacting and maintaining to obtain the ultra-high performance concrete.

10. Use of the ultra-high performance concrete according to any one of claims 1 to 6 in the field of construction.

Technical Field

The invention belongs to the technical field of building materials, and particularly relates to high-breaking-strength ultrahigh-performance concrete and a preparation method thereof.

Background

Concrete is an artificial building material formed by mixing raw materials such as cement, sand, stone, water and the like through manual stirring or forced stirring, has high strength and durability after being coagulated and hardened, and is widely applied to building structures such as houses, roads, bridges and the like. In recent years, with rapid development of economy and infrastructure, special building structures or facilities such as super high-rise buildings and long-span bridges appear, and ordinary concrete has a disadvantage of low tensile strength, self weight, poor durability under severe environments (e.g., high temperature and extremely cold), and the like, and thus it is difficult to meet the requirements of the special building structures or facilities. Therefore, the construction field puts demands on higher mechanical properties and better durability on Concrete, and these demands promote the appearance and development of Ultra-High Performance Concrete (UHPC), which is currently and internationally defined as a cement-based material with a compressive strength of more than 150 MPa.

Compared with common concrete, UHPC is characterized in that the flexural strength is high, the flexural strength corresponding to 7 days is more than 20MPa, the UHPC is mainly benefited by the doping of fibers in the UHPC, the fiber dosage is increased within a certain range, and the flexural strength of the UHPC is improved. In order to solve the problem, researchers try to adopt methods of controlling rheological property of the matrix, controlling flow direction of the steel fibers and the like to improve distribution of the fibers in the matrix, improve mechanical properties of the UHPC and achieve certain effects. The prior art also states that increasing the flexural strength of the UHPC matrix can increase the bending resistance of the UHPC to some extent. The technical measures for improving the rupture strength of UHPC are to eliminate the seed of fiberBesides the optimization selection, the common practice is to incorporate nano-material, adjust the distribution of fiber in UHPC, and other technical measures, such as incorporating nano-SiO₂Nano CaCO, nano-grade CaCO₃And the bending resistance of the UHPC is improved, and the flow direction of the steel fibers in the matrix is changed by controlling the arrangement direction of the steel fibers in the UHPC through a magnetic field. However, the flexural strength of the UHPC in the prior art is generally lower than 30MPa, and particularly the dynamic elastic modulus of the freeze-thaw cycle is reduced remarkably (the dynamic elastic modulus of the freeze-thaw cycle is used for measuring the high-temperature and low-temperature resistance of the UHPC).

Therefore, it is necessary to provide Ultra High Performance Concrete (UHPC) which has high flexural strength and excellent high and low temperature resistance.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art described above. Therefore, the invention provides the ultrahigh-performance concrete (UHPC) with high breaking strength and the preparation method thereof, the breaking strength of the ultrahigh-performance concrete corresponding to 7 days is more than 31MPa, even can exceed 40MPa, the ultrahigh-performance concrete has good high-temperature and low-temperature resistance, and the loss of the dynamic elastic modulus of freeze-thaw cycle is very little.

The invention conception of the invention is as follows: according to the ultra-high performance concrete, through reasonable matching of the using amount of each component (the components comprise graphene oxide and metal fibers) and the use of a specific device (the height of a discharge hole of the device is not more than 10mm), the directional distribution of the metal fibers (such as steel fibers) in the ultra-high performance concrete is improved, so that the breaking strength, the high temperature resistance and the low temperature resistance of the ultra-high performance concrete are obviously improved, and the mechanical performance and the weather resistance (the high temperature resistance and the low temperature resistance) of the ultra-high performance concrete are integrally and obviously improved.

The first aspect of the present invention provides an ultra-high performance concrete having high flexural strength.

Specifically, the ultrahigh-performance concrete with high flexural strength comprises, by weight, graphene oxide, metal fibers, a cementing material 1020-1035 part and a sand 1122-1139 part; the cementing material comprises 620 parts of cement 613-; the content of the graphene oxide is 0.01-0.3% of the weight of the gel material; the volume of the metal fiber is 1.2-2.5% of the volume of the ultra-high performance concrete.

Preferably, the ultrahigh-performance concrete with high breaking strength comprises, by weight, graphene oxide, metal fibers, a cementing material 1025 and 1030 parts, and sand 1127.5-1133 parts; the cementing material comprises 618 parts of cement 615-sand, 153.75-154.5 parts of silica fume, 206 parts of fly ash 205-sand and 51.25-51.5 parts of slag powder; the content of the graphene oxide is 0.01-0.03% of the weight of the gel material; the volume of the metal fiber is 1.5-2% of the volume of the ultra-high performance concrete.

Preferably, the graphite oxide is a nano graphene oxide sheet.

Preferably, the thickness of the nano graphene oxide sheet is 0.5-2.5nm, and the diameter of the main sheet layer is 0.5-12 μm; further preferably, the nano graphene oxide sheet has a sheet thickness of 0.5 to 2nm and a major sheet diameter of 0.5 to 10 μm. The purity of the nano graphene oxide sheet is more than 99%, the single-layer rate is more than 91%, a large number of oxygen-containing groups are arranged on the surface, and the nano graphene oxide sheet has good hydrophilicity and is non-conductive.

Preferably, the metal fibers are steel fibers. The steel fiber is used, and the flexural strength and the weather resistance of the ultra-high performance concrete are improved.

Preferably, the steel fibers have a length of 11 to 18mm and a diameter of 0.16 to 0.28 mm; further preferably, the steel fibers have a length of 12 to 16mm and a diameter of 0.18 to 0.25 mm.

Further preferably, the steel fiber is copper-plated steel fiber, and the tensile strength can reach 2800 MPa.

Preferably, the cement is portland cement, such as portland cement having the brand number p.o.42.5. The silicate cement and the polycarboxylic acid water reducing agent have good compatibility.

Preferably, the average particle size of the silica fume is 0.05-0.2 nm; more preferably, the silica fume has an average particle diameter of 0.08 to 0.1 nm.

Preferably, the specific surface area of the silica fume is more than 15m²/g；Further preferably, the specific surface area of the silica fume is more than 16m²/g。

Preferably, the silica fume is off-white in color.

Preferably, the fly ash is class I fly ash. The color of the fly ash is black.

Preferably, the slag powder is common slag powder sold in the market; further preferred is white S95 grade slag powder.

Preferably, the sand is quartz sand; further preferably, the sand comprises coarse quartz sand, medium quartz sand and fine quartz sand; the particle size of the coarse-particle quartz sand is 0.85-2 mm; the particle size of the medium-particle quartz sand is 0.425-0.85 mm; the particle size of the fine quartz sand is 0.212-0.425 mm.

Preferably, the weight content ratio of the sand to the gel material is 1.08-1.1: 1 (also known as the sand to glue ratio).

Preferably, the ultra-high performance concrete further comprises a solvent and a water reducing agent.

Preferably, the solvent is water.

Preferably, the water reducing agent comprises a polycarboxylic acid-based water reducing agent.

Preferably, the content of the water reducing agent is 0.4-0.6% of the weight of the gel material; the content of the water reducing agent is 0.5 percent of the weight of the gel material.

Preferably, the weight content ratio of the water to the gel material is 0.16-0.20: 1 (also called water-to-gel ratio); further preferably, the weight content ratio of the water to the gel material is 0.17-0.18: 1.

the second aspect of the present invention provides a method for preparing the above ultra-high performance concrete with high flexural strength.

Specifically, the preparation method of the ultrahigh-performance concrete with high flexural strength comprises the following steps:

the slurry formed by the components is poured into a device with the height of a discharge port not exceeding 10 mm.

Preferably, the discharge hole of the device is a cuboid, the height of the cuboid is not more than 10mm, the length of the cuboid exceeds the height, for example, the length is not less than 100mm, and the width of the cuboid is not less than 40mm, for example, the width is 50 mm.

Preferably, the discharge port of the device can also be a trapezoid, and the height of the trapezoid is not more than 10 mm.

The slurry contains metal fibers, and the distribution condition of the steel fibers in the UHPC can be obviously improved by the outlet of the device, so that the rupture strength and the high-temperature and low-temperature resistance of the UHPC are improved.

Preferably, the preparation method of the ultrahigh-performance concrete with high flexural strength comprises the following steps:

(1) and (3) dispersion treatment of graphene oxide: mixing the graphene oxide with a solvent to prepare a graphene oxide solution, then adding a water reducing agent, and mixing to prepare a mixed solution;

(2) stirring and mixing the cementing material and the sand, then adding the rest components, stirring and mixing to prepare slurry; and pouring the slurry into a device with a discharge port not more than 10mm in height, pouring the slurry flowing out of the device into a mould, compacting and maintaining to obtain the ultra-high performance concrete.

Preferably, in the step (1), the mass content of the graphene oxide in the graphene oxide solution is 0.1-1.2%; more preferably, the mass content of the graphene oxide is 0.8 to 1.1%.

Preferably, in the step (1), the graphene oxide solution is dispersed at a speed of 2200-.

Preferably, in the step (2), the curing includes film-covering curing and steam curing.

The third aspect of the present invention provides the use of the above ultra-high performance concrete with high flexural strength in the construction field.

Compared with the prior art, the invention has the following beneficial effects:

(1) according to the ultra-high performance concrete, through reasonable matching of the using amounts of the components (the components comprise graphene oxide and metal fibers), the metal fibers are not randomly distributed in the ultra-high performance concrete but have certain orientation, so that the flexural strength of the ultra-high performance concrete corresponding to 7 days is larger than 31MPa, even can exceed 40MPa, the high-temperature and low-temperature resistance of the ultra-high performance concrete is good, and the loss of the dynamic elastic modulus of freeze-thaw cycle is very little (the loss of the dynamic elastic modulus after the freeze-thaw cycle is smaller as the loss of the dynamic elastic modulus is closer to 1 as measured by the relative dynamic elastic modulus).

(2) In the preparation process of the ultra-high performance concrete, a specific device (the height of a discharge hole of the device is not more than 10mm) is used for improving the directional distribution of metal fibers (such as steel fibers) in the ultra-high performance concrete, so that the breaking strength, the high temperature resistance and the low temperature resistance of the ultra-high performance concrete are obviously improved, and the mechanical property and the weather resistance (the high temperature resistance and the low temperature resistance) of the ultra-high performance concrete are integrally and obviously improved.

Drawings

FIG. 1 is a schematic view of an apparatus used in the preparation of the ultra-high performance concrete of the present invention;

FIG. 2 is a graph showing the freezing resistance of the ultra-high performance concrete prepared by the present invention.

Detailed Description

In order to make the technical solutions of the present invention more apparent to those skilled in the art, the following examples are given for illustration. It should be noted that the following examples are not intended to limit the scope of the claimed invention.

The starting materials, reagents or apparatuses used in the following examples are conventionally commercially available or can be obtained by conventionally known methods, unless otherwise specified.

The water reducing agent used in the following examples can be a viscocrete-540P polycarboxylic acid powder high-performance water reducing agent produced by the Xika Chinese company.

Example (b): preparation of ultra-high performance concrete

The concrete components of 4 different ultra-high performance concretes (UHPC) with the numbers of 1, 2, 3, 4 are shown in Table 1 (in Table 1, "quartz sand (coarse)" represents "coarse-grained quartz sand", "quartz sand (middle)" represents "medium-grained quartz sand", and "quartz sand (fine)" represents "fine-grained quartz sand", the grain size of the coarse-grained quartz sand is 0.85-2mm, the grain size of the medium-grained quartz sand is 0.425-0.85mm, the grain size of the fine-grained quartz sand is 0.212-0.425mm, the length of the steel fiber is 12-16mm, the diameter is 0.18-0.25 mm. in Table 1, the rest components except the water reducing agent, the steel fiber and the graphene oxide are calculated according to the weight of kg per cubic meter, for example, the weight of the steel fiber in 1 is 615kg per cubic meter of the ultra-high performance concrete, the content of the graphene oxide is 0.00 or 0.3% of the weight of the gel material, the volume of the steel fiber is 1.5% of the volume of the ultra-high performance concrete In an amount of 0.5% by weight of the gel material; the weight content ratio of the sand to the gel material is 1.1: 1; the weight content ratio of the water to the gel material is 0.18: 1).

TABLE 1

The No. 1 and No. 2 ultrahigh-performance concrete is prepared according to the following preparation method: the method specifically comprises the following steps:

(1) and (3) dispersion treatment of graphene oxide: weighing the using amount of graphene oxide, mixing the graphene oxide with water to prepare a graphene oxide solution, wherein the mass content of the graphene oxide is 1.0%, dispersing at the speed of 2500 plus 3000 r/min, then adding a water reducing agent, and uniformly stirring and mixing to prepare a mixed solution;

(2) weighing the using amount of each component, stirring and mixing the cementing material and quartz sand in a concrete mixer for 3 minutes, then adding water and the mixed solution prepared in the step (1), stirring and mixing for 6 minutes, then adding steel fiber, stirring and mixing for 5-10 minutes to prepare slurry, wherein the slurry is in a good fluid state; pouring the slurry into a device (shown in figure 1) with a discharge port height of 10mm, pouring the slurry flowing out of the device into a concrete mold, compacting for 60s on a vibration table, laminating and curing, removing the mold after standard curing for 24 hours, immediately moving into a rapid-heating steam curing box after the mold is removed, heating to 90 ℃ at a temperature of 15 ℃/h, keeping for 48 hours, cooling to indoor temperature (for example, 20 ℃) at a temperature of 15 ℃/h, and finally moving into a standard curing room for curing to a detection age to obtain the ultra-high performance concrete.

FIG. 1 is a schematic view of an apparatus used in the preparation of the ultra-high performance concrete of the present invention; wherein "1" in fig. 1 denotes a slurry inlet port and "2" denotes a slurry outlet port; "a" represents the length of the discharge port, "b" represents the height of the discharge port, and the value of b is 10 mm.

The above-mentioned No. 3-4 ultra high performance concrete was prepared in the same manner as the above-mentioned No. 1 and No. 2 ultra high performance concrete except that the apparatus shown in FIG. 1 was not used in the preparation process.

Product effectiveness testing

1. Flexural Strength test

The flexural strength and compressive strength of the ultra-high performance concrete (UHPC) in the above 4 were measured under the same conditions for 7 days (7d) and 28 days (28d), and the results are shown in table 2 (28d flexural strength/28 d compressive strength in table 2).

TABLE 2

As can be seen from table 2, the flexural strength of the No. 2 ultra-high performance concrete is the greatest for 7 days and 28 days, and the No. 2 ultra-high performance concrete not only contains graphene oxide, but also improves the directional distribution of the steel fibers in the ultra-high performance concrete (which can also be referred to as the forward distribution of the steel fibers in the ultra-high performance concrete) by using the device shown in fig. 1 in the preparation process, thereby significantly improving the flexural strength and compressive strength of the ultra-high performance concrete. The device shown in fig. 1 is not used in the preparation process of the No. 4 ultra-high performance concrete, so that the distribution state of the steel fibers in the ultra-high performance concrete is a random state, and the bending resistance of the No. 4 ultra-high performance concrete is poorer than that of the No. 2 ultra-high performance concrete. No. 1 and No. 3 ultrahigh-performance concrete do not contain graphene oxide, so that the fracture resistance of the No. 1 and No. 3 ultrahigh-performance concrete is poorer than that of the No. 2 ultrahigh-performance concrete. In particular, the No. 3 ultra-high performance concrete does not contain graphene oxide, and the device shown in fig. 1 is not used in the preparation process, so that the distribution state of the steel fibers in the ultra-high performance concrete is random, and therefore, the fracture resistance of the No. 3 ultra-high performance concrete is the worst. Therefore, in the invention, the anti-folding performance of the prepared ultra-high performance concrete can be obviously improved by using the graphene oxide and the device shown in fig. 1.

2. Test for Freeze resistance

Taking the No. 1-4 ultra-high performance concrete, and performing freeze-thaw cycles for 500 times, wherein the total time of each freeze-thaw cycle is 3.5 hours, the freezing process is kept for 2 hours and 30 minutes, and the minimum temperature of the center of the ultra-high performance concrete is-16 ℃; the melting process is kept for 1 hour, the highest temperature of the center of the ultra-high performance concrete is 6 ℃, and the conversion time between freezing and melting is 1 minute; in the test process, the damage of the surface of the test piece is checked every 25 times of freeze-thaw cycles, the quality and the transverse fundamental frequency of the test piece are measured, and the relative dynamic elastic modulus of the ultra-high performance concrete is tested, and the result is shown in fig. 2.

FIG. 2 is a graph of the freezing resistance of the ultra-high performance concrete prepared by the present invention; in fig. 2, "1" represents No. 1 ultrahigh performance concrete, "2" represents No. 2 ultrahigh performance concrete, "3" represents No. 3 ultrahigh performance concrete, and "4" represents No. 4 ultrahigh performance concrete. As can be seen from FIG. 2, the anti-freezing performance of the ultra-high performance concrete No. 2 is strongest, and the relative dynamic elastic modulus of the ultra-high performance concrete No. 2 is reduced little (the loss amount is not more than 2%) after 500 times of freeze-thaw cycles. The No. 2 and No. 4 ultrahigh-performance concretes have better frost resistance than the No. 1 and No. 3 ultrahigh-performance concretes.

3. Testing of chloride ion penetration resistance

Compared with the No. 1 ultrahigh-performance concrete, no steel fiber is added, and other components and the preparation method are the same as those of the No. 1 ultrahigh-performance concrete, so that the No. 5 ultrahigh-performance concrete is prepared.

Compared with the No. 2 ultrahigh-performance concrete, no steel fiber is added, and other components and the preparation method are the same as those of the No. 2 ultrahigh-performance concrete, so that the No. 6 ultrahigh-performance concrete is prepared. I.e. No. 5 and No. 6 ultra high performance concrete, do not contain steel fibers. Then, the electric flux of the ultra-high performance concrete nos. 5 and 6 was measured according to the electric flux test method, and the results are shown in table 3.

TABLE 3

As can be seen from Table 3, the ultra high performance concretes No. 5 and No. 6 have very small electric flux because UHPC has very small water-gel ratio, and more mineral admixtures are added, thus achieving the effect of micro-aggregate, reducing the porosity of matrix, and the secondary hydration reaction of the mineral admixtures consumes Ca (OH)₂The content of (3) increases the generation amount of C-S-H gel, and is beneficial to improving the interface transition region so that the matrix is more compact.

Meanwhile, comparing the ultra-high performance concrete No. 5 and 6, the electric flux of the latter is two thirds of that of the former, which shows that the addition of the graphene oxide remarkably improves the chlorine ion permeation resistance of the UHPC (the smaller the electric flux, the stronger the chlorine ion permeation resistance). The graphene oxide can promote cement hydration, increase the generation amount of hydration products, optimize the pore structure of the matrix, and further improve the compaction degree of the UHPC matrix, so that the anti-permeability performance of the UHPC is improved.

In the ultra-high performance concrete, the directional distribution of the steel fibers reduces the spacing of the steel fibers, and greatly improves the crack resistance of the ultra-high performance concrete. The orientation distribution synergistic effect of the graphene oxide and the steel fibers improves the bending resistance of the ultra-high performance concrete. The graphene oxide can improve the chlorine ion permeability resistance and the freezing resistance of the ultra-high performance concrete to a certain extent, and the dense degree of the ultra-high performance concrete is improved mainly due to the filling effect of the graphene oxide on the matrix, the large specific surface area effectively limits the formation and the expansion of micro cracks of the matrix in a harsh environment, and the durability of the ultra-high performance concrete is improved.

In addition, in the technical scheme claimed by the invention, the dosage ratio of the components is adjusted, and the ultra-high performance concrete is prepared according to the preparation method of the No. 2 ultra-high performance concrete, and the folding resistance and the freezing resistance of the prepared ultra-high performance concrete are similar to those of the No. 2 ultra-high performance concrete. When the content of each component is not in the technical scheme claimed by the invention, the breaking resistance and the freezing resistance of the prepared ultra-high performance concrete are obviously reduced.

In the invention, the fluidity of UHPC is reduced due to the increase of the sand-to-glue ratio, the main reasons are that the use amount of sand is increased, the use amount of cementing materials is reduced, relatively less slurry is needed when a matrix flows, and the wrapping property of the slurry to aggregate is poor, thereby reducing the working performance. The silica fume has great influence on the working performance of UHPC, the higher the silica fume consumption is, the more serious the reduction of fluidity is, the spherical particles of the silica fume play a roll ball effect to improve the working performance, but the particle size of the silica fume is very small, more free water is adsorbed on the surface in the slurry stirring process, and the working performance of the slurry is obviously reduced. The addition of the fly ash has an effect of enhancing the working performance of the UHPC, and the larger the usage amount of the fly ash is, the better the fluidity of UHPC slurry is. The addition of the mineral powder is similar to that of the fly ash, and the fluidity of UHPC can be improved.