阅读说明：本技术 一种高性能混凝土 (High-performance concrete ) 是由 孙峰 慕金伯 吕新 于 2021-07-12 设计创作，主要内容包括：本发明一种高性能混凝土,其特征在于：按质量份数计包括：水泥100-300份；改性偏高岭土100-200份；膨润土50-100份；煤灰粉250-350份；砂800-900份；改性沥青75-100份；钢纤维200-300份；改性超高分子量聚乙烯纤维100-180份、功能性添加剂20-33份；水：500-800份；本发明提高了混凝土的各项力学性能,并有效改善了混凝土的抗冻融能力,同时降低了混凝土的制备成本。(The invention relates to high-performance concrete which is characterized in that: comprises the following components in parts by weight: 100 portions of cement and 300 portions of cement; 100-200 parts of modified metakaolin; 50-100 parts of bentonite; 250 portions and 350 portions of coal ash powder; 800 portions of sand and 900 portions of sand; 75-100 parts of modified asphalt; 200-300 parts of steel fiber; 100-180 parts of modified ultrahigh molecular weight polyethylene fiber and 20-33 parts of functional additive; water: 500-800 parts; the invention improves various mechanical properties of the concrete, effectively improves the freeze-thaw resistance of the concrete, and reduces the preparation cost of the concrete.)

1. A high-performance concrete is characterized in that: comprises the following components in parts by weight:

100 portions of cement and 300 portions of cement;

100-200 parts of modified metakaolin;

50-100 parts of bentonite;

250 portions and 350 portions of coal ash powder;

800 portions of sand and 900 portions of sand;

75-100 parts of modified asphalt;

200-300 parts of steel fiber;

100 portions of modified ultra-high molecular weight polyethylene fiber,

20-33 parts of a functional additive;

water: 500-800 parts.

2. The high-performance concrete as claimed in claim 1, wherein the specific surface area of the cement is more than or equal to 350m²Per kg; the particle size is 20-40 μm, and the cement is silicate or early strength silicate series cement with strength grade of 42.5 grade or above.

3. The high performance concrete of claim 1, wherein the SiO of the fly ash is₂、Al₂O₃The content of the fly ash is more than 80 percent by weight, the average grain diameter is 10-15 mu m, and the compression strength of the fly ash is 1.4MPa-1.6 MPa.

4. The high-performance concrete of claim 1, wherein the functional additive comprises, by mass, 20-25 parts of a polycarboxylic acid water reducing agent, 8-13 parts of a retarder, 7-14 parts of a silane coupling agent, 20-30 parts of limestone macadam, 8-10 parts of a nano composite filler, and 3-5 parts of a pigment.

5. The high-performance concrete as claimed in claim 1, wherein the sand is prepared by uniformly mixing silica sand and river sand according to a weight ratio of 1:1, wherein the content of silica in the silica sand is more than or equal to 98%.

6. The high-performance concrete as claimed in claim 1, wherein the silica sand comprises 3 different particle sizes, which are respectively coarse-particle-size silica sand, medium-particle-size silica sand and fine-particle-size silica sand, the particle size of the coarse-particle-size silica sand is 1000-600 μm, the particle size of the medium-particle-size silica sand is 600-300 μm, the particle size of the fine-particle-size silica sand is 300-100 μm, and the mass ratio is 1: (0.3-0.45): (0.2-0.22).

7. The high-performance concrete as claimed in claim 4, wherein the nano-composite filler is prepared by mixing titanium phosphate, copper tungstate, copper oxalate and magnesium oxide, and the mass ratio of the titanium phosphate to the copper tungstate to the copper oxalate to the magnesium oxide is 1: 2: 1: 1-3, wherein the pigment is iron oxide red or iron yellow.

Technical Field

The invention relates to the technical field of building materials in civil engineering, in particular to high-performance concrete.

Background

With the development of the technology, the engineering structure is developed towards deeper and longer directions, which puts higher requirements on the strength of the concrete. For ordinary concrete, the amount of cement used is large while satisfying the same function, which aggravates the demand for energy and the pollution to the environment. For this reason, ultrahigh performance concrete has been produced, and at present, a lot of research has been conducted on ultrahigh performance concrete, but the application in practical engineering is very little.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects of the prior art and provide high-performance concrete.

The technical scheme for solving the technical problems is as follows: the high-performance concrete comprises the following components in parts by weight:

100 portions of cement and 300 portions of cement;

100-200 parts of modified metakaolin;

50-100 parts of bentonite;

250 portions and 350 portions of coal ash powder;

800 portions of sand and 900 portions of sand;

75-100 parts of modified asphalt;

200-300 parts of steel fiber;

100 portions of modified ultra-high molecular weight polyethylene fiber,

20-33 parts of a functional additive;

water: 500-800 parts.

The invention further defines the technical scheme that:

preferably, the specific surface area of the cement is more than or equal to 350m²Per kg; the particle size is 20-40 μm, and the cement is silicate or early strength silicate series cement with strength grade of 42.5 grade or above.

Preferably, the SiO of the fly ash₂、Al₂O₃The content of the fly ash is more than 80 percent by weight, the average grain diameter is 10-15 mu m, and the compression strength of the fly ash is 1.4MPa-1.6 MPa.

Preferably, the functional additive comprises, by mass, 20-25 parts of a polycarboxylic acid water reducing agent, 8-13 parts of a retarder, 7-14 parts of a silane coupling agent, 20-30 parts of limestone macadam, 8-10 parts of a nano composite filler and 3-5 parts of a pigment.

Preferably, the sand is formed by uniformly mixing silica sand and river sand according to the weight ratio of 1:1, wherein the content of silicon dioxide in the silica sand is more than or equal to 98%.

Preferably, the silica sand comprises 3 different particle sizes, which are respectively coarse-particle-size silica sand, medium-particle-size silica sand and fine-particle-size silica sand, the particle size of the coarse-particle-size silica sand is 1000-600 μm, the particle size of the medium-particle-size silica sand is 600-300 μm, the particle size of the fine-particle-size silica sand is 300-100 μm, and the mass ratio is 1: (0.3-0.45): (0.2-0.22).

Preferably, the nano composite filler is formed by mixing titanium phosphate, copper tungstate, copper oxalate and magnesium oxide, and the mass ratio of the titanium phosphate to the copper tungstate to the copper oxalate to the magnesium oxide is 1: 2: 1: 1-3, wherein the pigment is iron oxide red or iron yellow.

The invention has the beneficial effects that: the modified metakaolin is matched with cement for use, so that various mechanical properties of concrete are obviously improved, the freeze-thaw resistance of the concrete is effectively improved, the preparation cost of the concrete is reduced, the working performance of underwater concrete is improved, the active reaction rate of the metakaolin is improved, the volume shrinkage of the concrete is reduced, and the durability of the concrete is improved;

the silane coupling agent is used for modifying the surface of the modified ultrahigh molecular weight polyethylene fiber, so that the toughness characteristic of the modified ultrahigh molecular weight polyethylene fiber is obviously enhanced by improving the interface bonding strength between the fiber and a matrix, the width of a crack in the cracking process of concrete is effectively controlled, the initial crack stress and the tensile strength of the concrete are improved, the effects of strain hardening, multi-crack cracking and crack refining are better realized, the asphalt has excellent miscibility and extremely strong adsorption force when being matched with limestone macadam;

the coal ash powder is added, so that the network polymerization of the slurry can be enhanced, and the slurry can be wound to form a network structure, so that agglomerated cement particles can be fully exerted, the concrete is thickened or flocculated, the compressive strength of the coal ash powder is high enough to play a good supporting effect, the required water reducing performance can be realized by using the functional additive in a matching way, the fluidity of the concrete is prevented from being reduced along with time, the construction in concrete filling is facilitated, the use amount of the cement is effectively reduced, and the strength of a concrete construction member is improved; the steel fiber is added, so that the toughness, the splitting tensile strength, the breaking strength and the bending strength of the concrete can be effectively improved;

according to the invention, the silica sand and the river sand are uniformly mixed according to the weight ratio of 1:1, meanwhile, the silica sand is composed of 3 different particle sizes, the size of an internal air hole of concrete can be effectively reduced, the air content of the concrete is reduced, and the fluidity and the compactness are improved, the mechanical property of the concrete can be improved by about 25% by the silica sand with different particle size ranges according to the mass ratio, and the silica sand has good safety and attractive visual effect by adding pigment, so that accidents caused by reflection of a large light lamp are reduced when the vehicle runs at night in rainy days.

Detailed Description

Example 1

The embodiment provides a high-performance concrete, which comprises the following components in parts by weight: 100 parts of cement; 100 parts of modified metakaolin; 50 parts of bentonite; 250 parts of coal ash powder; 800 parts of sand; 75 parts of modified asphalt; 200 parts of steel fiber; 100 parts of modified ultrahigh molecular weight polyethylene fiber and 20 parts of functional additive; water: 500 parts;

wherein the specific surface area of the cement is 350m²Per kg; portland cement with the grain diameter of 20 mu m and the strength grade of 42.5 grade and above; SiO of fly ash₂、Al₂O₃The content of (A) is 83, the average particle size is 10 mu m, and the compression strength of the fly ash is 1.4 MPaMPa; the functional additive comprises, by mass, 20 parts of a polycarboxylic acid water reducing agent, 8 parts of a retarder, 7 parts of a silane coupling agent, 20 parts of limestone macadam, 8 parts of a nano composite filler,3 parts of a pigment; the sand is formed by uniformly mixing silica sand and river sand according to the weight ratio of 1:1, wherein the content of silicon dioxide in the silica sand is 98%; the silica sand is composed of 3 different particle sizes, namely coarse-particle-size silica sand, medium-particle-size silica sand and fine-particle-size silica sand, wherein the particle size of the coarse-particle-size silica sand is 800 mu m, the particle size of the medium-particle-size silica sand is 600 mu m, the particle size of the fine-particle-size silica sand is 300 mu m, and the mass ratio of the fine-particle-size silica sand to the medium-particle-size silica sand is 1: 0.3: 0.2; the nano composite filler is formed by mixing titanium phosphate, copper tungstate, copper oxalate and magnesium oxide, wherein the mass ratio of the titanium phosphate to the copper tungstate to the copper oxalate to the magnesium oxide is 1: 2: 1: 1.5, the pigment is iron yellow.

Example 2

The embodiment provides a high-performance concrete, which comprises the following components in parts by weight: 200 parts of cement; 150 parts of modified metakaolin; 80 parts of bentonite; 300 parts of coal ash powder; 850 parts of sand; 90 parts of modified asphalt; 250 parts of steel fiber; 140 parts of modified ultrahigh molecular weight polyethylene fiber and 28 parts of functional additive; water: 680 parts of;

wherein the specific surface area of the cement is 400m²Per kg; the grain size is 30 μm, and the cement is Portland cement with strength grade of 42.5 grade or above; SiO of fly ash₂、Al₂O₃The content of (A) is 85 wt%, the average particle size is 12 μm, and the compression strength of the fly ash is 1.45 MPa; the functional additive comprises, by mass, 22 parts of a polycarboxylic acid water reducing agent, 10 parts of a retarder, 10 parts of a silane coupling agent, 3 parts of limestone macadam, 9 parts of a nano composite filler and 4 parts of a pigment; the sand is formed by uniformly mixing silica sand and river sand according to the weight ratio of 1:1, wherein the silica content in the silica sand is 99%;

the silica sand is composed of 3 different particle sizes, namely coarse-particle-size silica sand, medium-particle-size silica sand and fine-particle-size silica sand, wherein the particle size of the coarse-particle-size silica sand is 700 mu m, the particle size of the medium-particle-size silica sand is 400 mu m, the particle size of the fine-particle-size silica sand is 200 mu m, and the mass ratio of the silica sand to the fine-particle-size silica sand is 1: 0.33: 0.21; the nano composite filler is formed by mixing titanium phosphate, copper tungstate, copper oxalate and magnesium oxide, wherein the mass ratio of the titanium phosphate to the copper tungstate to the copper oxalate to the magnesium oxide is 1: 2: 1: 1.5, the pigment is iron yellow.

Example 3

The embodiment provides a high-performance concrete, which comprises the following components in parts by weight: 300 parts of cement; 200 parts of modified metakaolin; 100 parts of bentonite; 350 parts of coal ash powder; 900 parts of sand; 100 parts of modified asphalt; 300 parts of steel fiber; 180 parts of modified ultrahigh molecular weight polyethylene fiber and 33 parts of functional additive; water: 800 parts;

wherein the specific surface area of the cement is 500m²Per kg; the grain size is 40 μm, and the cement is early strength type portland cement with the strength grade of 42.5 grade and above; SiO of fly ash₂、Al₂O₃The content of (A) is 90 wt%, the average grain diameter is 10 mu m, and the compression strength of the fly ash is 1.5 MPa; the functional additive comprises 25 parts of polycarboxylic acid water reducing agent, 13 parts of retarder, 14 parts of silane coupling agent, 30 parts of limestone macadam, 10 parts of nano composite filler and 5 parts of pigment in parts by weight; the sand is formed by uniformly mixing silica sand and river sand according to the weight ratio of 1:1, wherein the content of silicon dioxide in the silica sand is 99.5 percent; the silica sand is composed of 3 different particle sizes, namely coarse-particle-size silica sand, medium-particle-size silica sand and fine-particle-size silica sand, wherein the particle size of the coarse-particle-size silica sand is 600 mu m, the particle size of the medium-particle-size silica sand is 300 mu m, the particle size of the fine-particle-size silica sand is 100 mu m, and the mass ratio of the fine-particle-size silica sand to the medium-particle-size silica sand is 1: 0.4: 0.22; the nano composite filler is formed by mixing titanium phosphate, copper tungstate, copper oxalate and magnesium oxide, wherein the mass ratio of the titanium phosphate to the copper tungstate to the copper oxalate to the magnesium oxide is 1: 2: 1: 3, the pigment is iron yellow.

The 28-day compressive strength, water permeability coefficient and initial setting time of the high performance concrete of examples 1-3 were measured, as shown in table 1:

TABLE 1

In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.