CN111233378A - Steel fiber-micro silicon powder concrete and preparation method thereof - Google Patents
Steel fiber-micro silicon powder concrete and preparation method thereof Download PDFInfo
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- CN111233378A CN111233378A CN202010052660.XA CN202010052660A CN111233378A CN 111233378 A CN111233378 A CN 111233378A CN 202010052660 A CN202010052660 A CN 202010052660A CN 111233378 A CN111233378 A CN 111233378A
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- steel fiber
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/04—Producing shaped prefabricated articles from the material by tamping or ramming
- B28B1/045—Producing shaped prefabricated articles from the material by tamping or ramming combined with vibrating or jolting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/08—Producing shaped prefabricated articles from the material by vibrating or jolting
- B28B1/093—Producing shaped prefabricated articles from the material by vibrating or jolting by means directly acting on the material, e.g. by cores wholly or partly immersed in the material or elements acting on the upper surface of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
- B28B1/523—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement containing metal fibres
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C5/00—Pavings made of prefabricated single units
- E01C5/06—Pavings made of prefabricated single units made of units with cement or like binders
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C5/00—Pavings made of prefabricated single units
- E01C5/06—Pavings made of prefabricated single units made of units with cement or like binders
- E01C5/065—Pavings made of prefabricated single units made of units with cement or like binders characterised by their structure or component materials, e.g. concrete layers of different structure, special additives
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention relates to steel fiber-micro silica powder concrete, which is characterized by comprising the following components in percentage by weight: the concrete comprises a micro silica powder concrete body, an upper steel fiber layer and a lower steel fiber layer, wherein the upper steel fiber layer and the lower steel fiber layer are distributed in the micro silica powder concrete body, the concrete body is prepared from the following raw materials of micro silica powder, cement, sand, pebbles, a water reducing agent and water, the upper steel fiber layer and the lower steel fiber layer are respectively composed of steel fibers, and the weight percentages of the micro silica powder, the cement, the sand, the pebbles, the water reducing agent, the water and the steel fibers are (20-50): (480-505): (558-603): (1150-1208): (3.2-6.3): (120-180): (18.84-25.12). The steel fiber-micro silica powder concrete based on the invention has stronger splitting tensile strength, breaking strength and compressive strength.
Description
Technical Field
The invention relates to the field of concrete preparation, in particular to steel fiber-micro silica powder concrete and a preparation method thereof.
Background
The cement concrete pavement is a rigid pavement, has good bending resistance, compression resistance and wear resistance, good durability, difficult aging and decay, and better stability, namely high and low temperature and water stability, is mainly high in bearing capacity, and is very suitable for heavy traffic. But because the tensile crack resistance of concrete is poor, the road is easy to crack and repair in the specific using process.
Disclosure of Invention
The technical problem solved by the invention is as follows: the steel fiber-micro silica powder concrete based on the invention has greatly improved mechanical properties such as splitting tensile strength, breaking strength, compressive strength and the like compared with micro silica powder concrete.
The concrete solution of the invention is as follows:
the invention provides steel fiber-micro silica powder concrete, which comprises the following components: the concrete comprises a micro silica powder concrete body, an upper steel fiber layer and a lower steel fiber layer, wherein the upper steel fiber layer and the lower steel fiber layer are distributed in the micro silica powder concrete body, the concrete body is prepared from the following raw materials of micro silica powder, cement, sand, stones, a water reducing agent and water, the upper steel fiber layer and the lower steel fiber layer are respectively composed of steel fibers, and the weight percentages of the micro silica powder, the cement, the sand, the stones, the water reducing agent, the water and the steel fibers are (20-50): (480-505): (558-603): (1150-1208): (3.2-6.3): (120-180): (18.84-25.12).
The micro silica fume has extremely strong volcanic ash effect, and can be mixed with cement hydration products Ca (OH) when being mixed with concrete2The secondary hydration reaction is carried out to form a gelled product, a cement stone structure is filled, the microstructure of the slurry is improved, and the mechanical property and the durability of a hardened body are improved. The steel fiber layer is arranged in the micro-silica powder concrete body prepared from micro-silica powder, cement, sand, stones, a water reducing agent and water, so that the ductility and toughness of concrete can be effectively improved while the strength and durability of the concrete are improved, and the steel fiber-micro-silica powder concrete is made of steel fiberCompared with common micro-silica powder concrete, the mechanical properties of the concrete such as the splitting tensile strength, the breaking strength, the compressive strength and the like are greatly improved.
On the basis of the above scheme, the technical scheme of the invention can be further improved as follows:
further, the steel fiber is 25-35mm long, 0.2-0.8mm in diameter and 40-80 in length-diameter ratio, and the average grain size of the micro silicon powder is 0.1-0.2 um.
The influence of the addition amount and the size of the silica fume and the steel fiber on the mechanical property of the concrete is remarkable, the average particle size of the silica fume is uniform and small, the silica fume and the steel fiber composite material have a good filling effect, the silica fume and the steel fiber composite material can be filled between cement particle gaps and between the steel fiber and the cement gaps, the strength and the durability of the concrete are improved, the flexural strength of the concrete can be increased through the layered steel fiber, the concrete is pulled when the concrete is damaged, and the service life of the structure of the concrete is prolonged. Under the size condition, the synergistic effect of the steel fiber and the micro silicon powder is remarkable, so that the tensile strength and the flexural strength of the concrete are remarkably improved.
Further, the cement is 32.5-52.5 grade general purpose portland cement.
Further, the sand is any one or combination of more of quartz sand, river sand, machine-made sand and mountain sand with the particle size of 20-70 meshes.
Further, the water reducing agent is a polycarboxylic acid high-performance water reducing agent.
The invention also provides a preparation method of the steel fiber-micro silica powder concrete, which comprises the following steps:
1) preparing raw materials: preparing raw materials according to the weight percentage;
2) preparing mixed slurry: putting the prepared sand, cobblestone, cement and silica fume into a stirrer, uniformly stirring, adding a water reducing agent solution formed by a water reducing agent and water into the stirrer, and stirring for 2-4min to obtain silica fume mixed slurry;
3) pouring and forming concrete: pouring the mixed slurry into a mold, vibrating for about 6-15s to make the mixed slurry higher than the bottom of the mold by 1-3cm, uniformly spreading a layer of the steel fibers, pouring by using the mixed slurry material, vibrating for 20-40s to make the concrete lower than the top surface of the mold by 1-3cm, uniformly spreading a layer of the steel fibers, pouring by using the mixed slurry material, and vibrating until the concrete does not bubble any more;
4) and (5) maintenance: curing the formed concrete for 25-30 days at the humidity of more than 95% and the temperature of 20 +/-3 ℃.
5) And removing the formwork, and removing the cured concrete to obtain a concrete finished product.
The preparation method based on the invention has simple process and low cost, and the prepared steel fiber-polyvinyl alcohol fiber concrete with the layered structure has excellent mechanical properties such as splitting tensile strength, breaking strength, compressive strength and the like, is not easy to crack in the concrete using process, has long service life and has good application prospect.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic structural view of a steel fiber-micro silica powder concrete according to an embodiment of the present invention.
In the drawings, the names of the components represented by the respective reference numerals are:
a micro silica powder concrete body 1; an upper steel fiber layer 2; the lower steel fiber layer 3.
Detailed Description
The principles and features of this invention are described in connection with the drawings and the detailed description of the invention, which are set forth below as examples to illustrate the invention and not to limit the scope of the invention.
As shown in fig. 1, the steel fiber-micro silica powder concrete according to the present invention includes: the concrete comprises a micro silica powder concrete body 1, an upper steel fiber layer 2 and a lower steel fiber layer 3, wherein the upper steel fiber layer 2 and the lower steel fiber layer 3 are distributed in the micro silica powder concrete body, the concrete body 1 is prepared from the following components in percentage by weight: (480-505): (558-603): (1150-1208): (3.2-6.3): (120-180): (18.84-25.12).
Example 1:
the concrete preparation process of the layered steel fiber-micro silica powder concrete is as follows:
preparation of 1m3The layered steel fiber-micro silica powder concrete is prepared from the following raw materials in parts by weight: 25kg of micro silicon powder, 18.84kg of steel fiber, 477kg of cement, 593kg of sand, 1151kg of stones, 4.26kg of water reducing agent and 150.5kg of water, starting a stirrer, putting the weighed sand and stones into the stirrer, stirring for 30s, putting a mixture of the cement and the micro silicon powder, stirring for 30s, dissolving the water reducing agent in water to form a water reducing agent solution, adding the water reducing agent solution into the stirrer, stirring for 3min, pouring the stirred concrete mixed slurry into a mold, vibrating on a vibrating table for about 10s, controlling the thickness of the concrete to be about 2cm by using a steel ruler, uniformly scattering 12.56kg of lower layer steel fiber on the concrete with the thickness of 2cm, continuously pouring the stirred concrete mixed slurry into the mold, vibrating the concrete in the mold for about 30s by using the vibrating table, controlling the thickness of the concrete to be about 2cm away from the top surface of the mold by using the steel ruler, uniformly scattering 6.28kg of upper layer steel fiber on the concrete, and finally, filling the whole mould with the concrete mixed slurry, vibrating for 10s until no bubbles are formed on the surface of the concrete, thus obtaining a primary layered steel fiber-micro silica powder concrete product, placing the formed primary concrete product in a shade place, standing for 24h, then placing the product in a curing box, curing for 28 days under the conditions of the humidity of 98% and the temperature of 23 ℃, and removing the cured concrete mould, thus obtaining the concrete finished product.
Example 2
Similar to example 1, except that the quality of each raw material was different from that of example 1.
Preparation of 1m in this example3The layered steel fiber-micro silica powder concrete comprises the following raw materials in parts by weight: 25kg of micro silicon powder, 12.56kg of lower layer steel fiber, 9.42kg of upper layer steel fiber, 477kg of cement, 593kg of sand, 1151kg of stones, 4.26kg of water reducing agent and 150.5kg of water
Example 3
Similar to example 1, except that the quality of each raw material was different from that of example 1.
Preparation of 1m in this example3The layered steel fiber-micro silica powder concrete comprises the following raw materials in parts by weight: 25kg of micro silicon powder, 12.56kg of lower layer steel fiber, 12.56kg of upper layer steel fiber, 477kg of cement, 593kg of sand, 1151kg of stones, 4.26kg of water reducing agent and 150.5kg of water.
Example 4
Similar to the examples, except that the quality of each raw material was different from that of example 1.
Preparation of 1m in this example3The layered steel fiber-micro silica powder concrete comprises the following raw materials in parts by weight: 40kg of silica fume, 12.56kg of lower layer steel fiber, 6.28kg of upper layer steel fiber, 462kg of cement, 593kg of sand, 1151kg of stones, 4.26kg of water reducing agent and 150.5kg of water. Example 5
Similar to the examples, except that the quality of each raw material was different from that of example 1.
Preparation of 1m in this example3The layered steel fiber-micro silica powder concrete comprises the following raw materials in parts by weight: 40kg of silica fume, 12.56kg of lower layer steel fiber, 9.42kg of upper layer steel fiber, 462kg of cement, 593kg of sand, 1151kg of stones, 4.26kg of water reducing agent and 150.5kg of water.
Example 6
Similar to the examples, except that the quality of each raw material was different from that of example 1.
Preparation of 1m in this example3The layered steel fiber-micro silica powder concrete comprises the following raw materials in parts by weight: 40kg of micro silicon powder, 12.56kg of lower layer steel fiber, 12.56kg of upper layer steel fiber, 462kg of cement, 593kg of sand, 1151kg of stones, 4.26kg of water reducing agent and 150.5kg of water.
Example 7
Similar to the examples, except that the quality of each raw material was different from that of example 1.
Preparation of 1m in this example3The layered steel fiber-micro silica powder concrete comprises the following raw materials in parts by weight: 50kg of micro silicon powder, 12.56kg of lower layer steel fiber, 6.28kg of upper layer steel fiber, 452kg of cement, 593kg of sand and 1151kg of stoneskg, water reducing agent 4.26kg, water 150.5 kg. Example 8
Similar to the examples, except that the quality of each raw material was different from that of example 1.
Preparation of 1m in this example3The layered steel fiber-micro silica powder concrete comprises the following raw materials in parts by weight: 50kg of micro silicon powder, 12.56kg of lower layer steel fiber, 9.42kg of upper layer steel fiber, 452kg of cement, 593kg of sand, 1151kg of stones, 4.26kg of water reducing agent and 150.5kg of water.
Example 9
Similar to the examples, except that the quality of each raw material was different from that of example 1.
Preparation of 1m in this example3The layered steel fiber-micro silica powder concrete comprises the following raw materials in parts by weight: 50kg of micro silicon powder, 12.56kg of lower layer steel fiber, 12.56kg of upper layer steel fiber, 452kg of cement, 593kg of sand, 1151kg of stones, 4.26kg of water reducing agent and 150.5kg of water.
Comparative example 1
The concrete preparation process of the micro-silica powder concrete is as follows:
the micro-silica powder concrete is prepared from the following raw materials in parts by weight: 25kg of micro silicon powder, 477kg of cement, 593kg of sand, 1151kg of stones, 4.26kg of water reducing agent and 150.5kg of water, starting a stirrer, putting the weighed sand and stones into the stirrer, stirring for 30s, putting a mixture of the cement and the micro silicon powder, stirring for 30s, dissolving the water reducing agent in water to form a water reducing agent solution, adding the water reducing agent solution into the stirrer, stirring for 3min, pouring the stirred concrete mixed slurry into a mould, vibrating until no air bubbles are formed on the surface of the concrete, obtaining a micro silicon powder concrete primary product, placing the formed concrete primary product in a shade place, standing for 24h, then placing the concrete primary product in a curing box, curing for 28 days under the conditions that the humidity is 98% and the temperature is 23 ℃, and removing the cured concrete from the mould to obtain a concrete finished product.
The concrete prepared in examples 1 to 9 and comparative example 1 was subjected to mechanical property test, and the results of the property measurement are shown in table 1:
table 1: test result table of mechanical properties of concrete
As can be seen from the performance test results in Table 1, the layered steel fiber-micro silica powder concrete based on the invention has excellent mechanical properties, and the tensile strength, the flexural strength and the compressive strength of the layered structural steel fiber-micro silica powder concrete are higher than those of the micro silica powder concrete.
Although embodiments of the present invention have been described in detail above, those of ordinary skill in the art will understand that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (6)
1. A steel fiber-micro silica powder concrete, comprising: the concrete comprises a micro silica powder concrete body (1), an upper steel fiber layer (2) and a lower steel fiber layer (3), wherein the upper steel fiber layer (2) and the lower steel fiber layer (3) are distributed in the micro silica powder concrete body, the concrete body (1) is prepared from the following raw materials of micro silica powder, cement, sand, stones, a water reducing agent and water, the upper steel fiber layer (2) and the lower steel fiber layer (3) are respectively composed of steel fibers, and the weight percentages of the micro silica powder, the cement, the sand, the stones, the water reducing agent, the water and the steel fibers are (20-50): (480-505): (558-603): (1150-1208): (3.2-6.3): (120-180): (18.84-25.12).
2. The steel fiber-micro silicon powder concrete according to claim 1, wherein the steel fiber is a steel fiber with a length of 25-35mm, a diameter of 0.2-0.8mm and an aspect ratio of 40-80, and the micro silicon powder has an average particle size of 0.1-0.2 um.
3. The steel fiber-micro silica powder concrete according to claim 1, wherein the cement is general portland cement grade 32.5-52.5.
4. The steel fiber-micro silica powder concrete according to claim 1, wherein the sand is one or more of quartz sand, river sand, machine-made sand, and mountain sand having a particle size of 20-70 mesh.
5. The steel fiber-micro silica powder concrete according to claim 1, wherein the water reducing agent is a polycarboxylic acid high performance water reducing agent.
6. A method for the production of a steel fibre-micro silica powder concrete according to any one of claims 1 to 5, characterised in that it comprises the following steps:
1) preparing raw materials: preparing raw materials according to the weight percentage;
2) preparing mixed slurry: putting the prepared sand, cobblestone, cement and silica fume into a stirrer, uniformly stirring, adding a water reducing agent solution formed by a water reducing agent and water into the stirrer, and stirring for 2-4min to obtain silica fume mixed slurry;
3) pouring and forming concrete: pouring the mixed slurry into a mold, vibrating for about 6-15s to make the mixed slurry higher than the bottom of the mold by 1-3cm, uniformly spreading a layer of the steel fibers, pouring by using the mixed slurry material, vibrating for 20-40s to make the concrete lower than the top surface of the mold by 1-3cm, uniformly spreading a layer of the steel fibers, pouring by using the mixed slurry material, and vibrating until the concrete does not bubble any more;
4) and (5) maintenance: curing the formed concrete for 25-30 days at the humidity of more than 95% and the temperature of 20 +/-3 ℃;
5) removing the mold: and removing the cured concrete form to obtain a concrete finished product.
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2020
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| KR100467645B1 (en) * | 2002-03-05 | 2005-01-24 | 우경건설 주식회사 | High tension strength concrete and method for constructing double concrete structures using the same |
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