CN111039632A - Anti-disturbance concrete and preparation method thereof - Google Patents
Anti-disturbance concrete and preparation method thereof Download PDFInfo
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- CN111039632A CN111039632A CN201911341023.8A CN201911341023A CN111039632A CN 111039632 A CN111039632 A CN 111039632A CN 201911341023 A CN201911341023 A CN 201911341023A CN 111039632 A CN111039632 A CN 111039632A
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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
- C04B28/02—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 containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
- C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/20—Retarders
- C04B2103/22—Set retarders
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2038—Resistance against physical degradation
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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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
Abstract
The invention discloses disturbance-resistant concrete and a preparation method thereof, and belongs to the technical field of concrete. The disturbance-resistant concrete is mainly prepared from the following raw materials in parts by weight: 1000 parts of sulphoaluminate cement, 415 parts of slag powder 390-; the retarder is at least one of sulfonated lignin, sodium pyrophosphate and starch. The disturbance-resistant concrete can prolong the setting time of the concrete, reduce the dry cracking shrinkage of the concrete, improve the disturbance resistance of the concrete and avoid the generation of cracks caused by the disturbance of the concrete in the using process.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to disturbance-resistant concrete and a preparation method thereof.
Background
The concrete is a building material with the widest application and the largest consumption at present, and plays an irreplaceable role in the construction fields of buildings, roads, water power and the like. In China, with the high-speed development of infrastructure, a plurality of roads are built by using concrete bridge structures, and the concrete bridge structures are more and more seriously damaged due to the increase of traffic volume and vehicle carrying capacity on the roads. In order to reduce the damage degree of roads and bridges, ensure the service life of the roads and bridges and improve the disturbance resistance of concrete, the method is an effective method.
The Chinese invention patent with application publication number CN106587787A discloses an anti-disturbance concrete, which comprises grouting material, pebbles, water and additives, wherein the mass ratio of the grouting material is as follows: stone: the additive is crack-resistant toughening additive or crack-resistant toughening additive and fiber or crack-resistant toughening additive and early strength agent, and the crack-resistant toughening additive is polyvinyl alcohol; the proportion of the fiber is 0.1-0.4% of the grouting material, the fiber is basalt fiber, the proportion of the early strength agent is 0.5-1% of the grouting material, and the early strength agent is sodium sulfate, calcium formate, sodium chloride, calcium chloride or calcium nitrate. The concrete has high fluidity, but the compressive strength of the concrete under disturbed conditions still needs to be improved.
Disclosure of Invention
Aiming at the defects in the prior art, the first object of the invention is to provide the disturbance resistant concrete which has good disturbance resistance and higher compressive strength under disturbed conditions.
The second purpose of the invention is to provide a preparation method of the disturbance resistant concrete, which can improve the mixing uniformity among raw materials.
In order to achieve the first object, the invention provides the following technical scheme:
an anti-disturbance concrete is mainly prepared from the following raw materials in parts by weight: 1000 parts of sulphoaluminate cement, 415 parts of slag powder 390-; the retarder is at least one of sulfonated lignin, sodium pyrophosphate and starch.
By adopting the technical scheme, the retarder is added into the concrete, and at least one of the sulfonated lignin, the sodium pyrophosphate and the starch is adopted as the retarder, so that the hydration time of the cement can be adjusted, the setting time of the concrete is further prolonged, the crack shrinkage generated in the setting process of the concrete is reduced, the micro-cracks generated in the concrete during the curing process are avoided, and the disturbance resistance of the concrete is enhanced. The sulfonated lignin, sodium pyrophosphate and starch can prolong the setting time of concrete, and can improve the binding power among raw materials, thereby improving the strength of the concrete and avoiding the concrete from generating cracks when being disturbed in the later use process.
The invention is further configured to: the disturbance-resistant concrete is mainly prepared from the following raw materials in parts by weight: 1000 parts of sulphoaluminate cement, 415 parts of slag powder, 580 parts of natural sand, 625 parts of reinforcing fiber, 10-15 parts of water reducing agent, 15-17 parts of retarder and 395 parts of water 385-; the retarder is at least one of sulfonated lignin, sodium pyrophosphate and starch.
Through adopting above-mentioned technical scheme, the ratio of each raw materials has been preferred for cooperate between retarder and other raw materials, give play to the effect of retarder more fully, further improve the interference resistance of concrete.
The invention is further configured to: the reinforced fiber is at least one of polypropylene fiber and alkali-resistant glass fiber.
By adopting the technical scheme, the reinforced fiber adopts the polypropylene fiber and the alkali-resistant glass fiber, so that the toughness of concrete can be improved, and the generation and development of fine cracks are inhibited. Moreover, the polypropylene fiber and the alkali-resistant fiber are added into the concrete, so that the anti-shrinkage performance is better, and the anti-interference and anti-cracking performance of the concrete can be greatly improved under the condition of smaller usage amount.
The invention is further configured to: the reinforcing fiber is formed by mixing polypropylene fiber and alkali-resistant glass fiber in a mass ratio of (1.2-4): 1.
By adopting the technical scheme, the mode of matching the inorganic fibers and the organic fibers is adopted, the strength advantage of the inorganic fibers and the toughness advantage of the organic fibers can be fully exerted, and the strength reduction of concrete caused by the improvement of the disturbance resistance after the reinforcing fibers are added is avoided.
The invention is further configured to: the retarder comprises sulfonated lignin and starch in a mass ratio of 1: 1.
By adopting the technical scheme, the sulfonated lignin and the starch are used as the main components of the retarder, and the macromolecular advantages of the sulfonated lignin and the starch can be utilized to form a complex cross-linked structure in concrete, so that the toughness and the shrinkage resistance of the concrete are further improved. The sulfonated lignin can be adsorbed on the surfaces of micro particles of cement, so that the dispersing capacity of the cement and the binding force with other raw materials are improved, and the uniformity and stability of the concrete slurry are improved. By adopting the mass ratio of 1:1, the active groups on the sulfonated lignin can be connected together by fully utilizing the groups on the starch, so that the two groups can form a more complex cross-linking structure, the toughness of the concrete is further improved, and excessive retardation caused by excessive starch can be avoided.
The invention is further configured to: the raw material also comprises 2-8 parts by weight of a coagulation regulator, wherein the coagulation regulator is at least one of boric acid and lithium chloride.
By adopting the technical scheme, a small amount of the coagulation regulator is added, the initial setting time and the final setting time of the concrete can be further regulated, and the disturbed period of the concrete is shortened. The retarder is at least one of boric acid and lithium chloride, and can promote the adsorption of the retarder and further improve the disturbance resistance of the concrete. In addition, boric acid can be combined with starch, so that the crosslinking effect of the starch is improved; lithium chloride can also improve the early strength of concrete.
In order to achieve the second object, the invention provides the following technical scheme:
the preparation method of the disturbance-resistant concrete comprises the following steps:
1) mixing sulphoaluminate cement, slag powder, natural sand and water uniformly to prepare first slurry;
uniformly mixing the reinforced fibers, the water reducing agent, the retarder and water to prepare second slurry;
2) and uniformly mixing the first slurry and the second slurry to obtain the composite material.
By adopting the technical scheme, because the weight ratio of the sulphoaluminate cement, the slag powder and the natural sand in various raw materials of the concrete is very large, the proportion of other raw materials is small relative to the raw materials, and if the raw materials with small proportion are added into the raw materials one by one, the raw materials can be uniformly dispersed by stirring for a long time. The raw materials and water are firstly prepared into first slurry, the raw materials with smaller proportion and the water are prepared into second slurry, and when the two kinds of slurries dispersed in the water are mixed, all the raw materials can be dispersed more uniformly under the action of the water. Therefore, the prepared concrete is more stable, the texture of each part is uniform after curing, and cracks caused by stress concentration at uneven positions when the concrete is disturbed by external force are avoided.
The invention is further configured to: the step 1) of uniformly mixing the sulphoaluminate cement, the slag powder, the natural sand and the water is to uniformly mix the sulphoaluminate cement, the slag powder and the natural sand, and then add the water to uniformly mix.
By adopting the technical scheme, the sulphoaluminate, the slag powder and the natural sand are firstly dry-mixed, so that the slag powder and the natural sand are conveniently and uniformly mixed before the cement contacts water, and the influence of viscosity increase after the cement contacts water on the dispersion of the slag powder and the natural sand is avoided.
The invention is further configured to: the sulphoaluminate cement, the slag powder and the natural sand are uniformly mixed, namely the sulphoaluminate cement and the slag powder are uniformly mixed and then are uniformly mixed with the natural sand.
By adopting the technical scheme, because the particle size of the natural sand is generally larger and the particle sizes of the cement and the slag powder are very small, if the cement or the slag powder is added into the natural sand for mixing, the raw materials with smaller particle sizes are blocked by the natural sand particles, so that the cement and the slag powder cannot be uniformly dispersed, and the sulphoaluminate cement and the slag powder are uniformly mixed firstly, so that the sulphoaluminate cement and the slag powder can be uniformly dispersed in the gaps among the natural sand particles.
The invention is further configured to: the reinforcing fiber, the water reducing agent, the retarder and the water are uniformly mixed, namely, the starch and the water are uniformly mixed, then the boric acid is added and uniformly mixed, then the reinforcing fiber is added and uniformly mixed, and then the water reducing agent is added and uniformly mixed.
By adopting the technical scheme, the starch is firstly mixed with water, the starch is hydrated under the action of the water, then the boric acid is added, the boric acid can perform a crosslinking action with groups on the hydrated starch, a complex crosslinked network structure is generated, and the strength of the concrete is finally improved.
In conclusion, the invention has the following beneficial effects:
firstly, the retarder is added into the disturbance-resistant concrete, so that the setting time of the concrete can be prolonged, the crack shrinkage of the concrete is reduced, the disturbance resistance of the concrete is improved, and cracks caused by disturbance in the use process of the concrete are avoided.
Secondly, the retarder added into the disturbance-resistant concrete is further preferably sulfonated lignin and starch, the macromolecular advantages of the sulfonated lignin and the starch can be fully utilized, a complex cross-linked structure is formed in the concrete, and the shrinkage resistance of the concrete is further improved.
Drawings
Fig. 1 is a schematic view showing the variation of penetration resistance of disturbance-resistant concrete in example 4 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples.
In the preparation method of the disturbance resistant concrete, when the first slurry is prepared and the sulphoaluminate cement and the slag powder are mixed, the mixture is stirred for 30-60s at the rotating speed of 10-20 rpm. After adding the natural sand, stirring for 20-30s at the rotating speed of 30-50 rpm. Adding water, and stirring at 30-50rpm for 1-2min to obtain a first slurry.
When the second slurry is prepared, the water reducing agent, the reinforcing fiber and the retarder are uniformly mixed to prepare a second premix, and then the second premix is uniformly mixed with water to prepare the second slurry. Specifically, the water reducing agent, the polypropylene fiber and the sulfonated lignin are mixed and stirred for 50-60s at the rotating speed of 80-100rpm, and then water is added and stirred for 30-50s at the rotating speed of 100-120rpm to prepare the second slurry.
The second slurry may be prepared in another manner including the steps of: the starch and the water are uniformly mixed, then the boric acid is added and uniformly mixed, then the reinforcing fiber is added and uniformly mixed, and then the water reducing agent is added and uniformly mixed. Specifically, the starch is mixed with water at a speed of 120-150rpm for 20-30 s. Then adding boric acid and stirring at the rotating speed of 100-120rpm for 15-20 s. Then adding the reinforced fiber and stirring at the rotating speed of 80-100rpm for 20-30 s. Then adding a water reducing agent and sulfonated lignin, and stirring for 1-2min at the rotating speed of 50-80 rpm.
And stirring the first slurry and the second slurry for 20-30s at a rotating speed of 80-100rpm when the first slurry and the second slurry are mixed.
The slag micro powder used by the invention is S95 grade slag powder, and the specific surface area is 438m2/kg。
Example 1
The disturbance-resistant concrete of the embodiment is prepared from the following raw materials in parts by weight: 1000kg of sulphoaluminate cement, 400kg of slag powder, 600kg of natural sand, 12kg of polypropylene fiber, 14kg of polycarboxylic acid water reducing agent, 6kg of sulfonated lignin and 378kg of water. The natural sand is 0.15-1.18mm continuous gradation natural sand. The mud content in the natural sand is less than or equal to 1.5 percent, and the mud block content is less than or equal to 0.5 percent. The polypropylene fibers had a length of 12 mm. The polycarboxylate superplasticizer is a polycarboxylate superplasticizer which is an ST-01A type polycarboxylate high-performance water reducer produced by Luoyang Junjiang building materials science and technology Limited company, the water reducing rate is not less than 25%, and the bleeding rate ratio is not more than 43%.
The preparation method of the disturbance resistant concrete of the embodiment comprises the following steps:
1) adding sulphoaluminate cement and slag powder into a stirrer, stirring for 50s at the rotating speed of 10rpm, then adding natural sand, and stirring for 30s at the stirring speed of 30rpm to prepare a first premix; mixing the first premix with 365kg of water, and stirring at the rotating speed of 30rpm for 2min to prepare first slurry;
2) mixing a polycarboxylic acid water reducing agent, polypropylene fibers and sulfonated lignin, and stirring at the rotating speed of 80rpm for 20s to prepare a second premix; mixing the second premix with 13kg of water, and stirring at the rotating speed of 100rpm for 30s to prepare second slurry;
3) and then adding the second slurry into the first slurry, and stirring at the rotating speed of 80rpm for 20s to obtain the composite material.
Example 2
The disturbance-resistant concrete of the embodiment is prepared from the following raw materials in parts by weight: 1000kg of sulphoaluminate cement, 415kg of slag powder, 585kg of natural sand, 10kg of polypropylene fiber, 5kg of alkali-resistant glass fiber, 15kg of polycarboxylic acid water reducing agent, 8kg of sulfonated lignin, 2kg of boric acid, 8kg of cassava starch and 392kg of water. The natural sand is 0.15-1.18mm continuous gradation natural sand. The mud content in the natural sand is less than or equal to 1.5 percent, and the mud block content is less than or equal to 0.5 percent. The length of the polypropylene fiber is 12mm, and the length of the alkali-resistant glass fiber is 10 mm. The polycarboxylate superplasticizer is a polycarboxylate superplasticizer which is an ST-01A type polycarboxylate high-performance water reducer produced by Luoyang Junjiang building materials science and technology Limited company, the water reducing rate is not less than 25%, and the bleeding rate ratio is not more than 43%.
The preparation method of the disturbance resistant concrete of the embodiment comprises the following steps:
1) adding sulphoaluminate cement and slag powder into a stirrer, stirring at the rotating speed of 10rpm for 60s, then adding natural sand, and stirring at the stirring speed of 35rpm for 30s to prepare a first premix; mixing the first premix with 372kg of water, and stirring at the rotating speed of 50rpm for 1min to prepare first slurry;
2) mixing cassava starch with 20kg of water, stirring for 30s at the rotating speed of 120rpm, then adding boric acid, stirring for 20s at the rotating speed of 100rpm, then adding polypropylene fiber and alkali-resistant glass fiber, stirring for 25s at the rotating speed of 90rpm, then adding a polycarboxylic acid water reducing agent and sulfonated lignin, and stirring for 1min at the rotating speed of 80rpm to prepare second slurry;
3) and then adding the second slurry into the first slurry, and stirring at the rotating speed of 80rpm for 30s to obtain the composite material.
Example 3
The disturbance-resistant concrete of the embodiment is prepared from the following raw materials in parts by weight: 1000kg of sulphoaluminate cement, 405kg of slag powder, 595kg of natural sand, 12kg of polypropylene fiber, 3kg of alkali-resistant glass fiber, 10kg of polycarboxylic acid water reducing agent, 5kg of sulfonated lignin, 3kg of boric acid, 5kg of cassava starch, 6kg of sodium pyrophosphate, 3kg of lithium chloride and 385kg of water. The natural sand is 0.15-1.18mm continuous gradation natural sand. The mud content in the natural sand is less than or equal to 1.5 percent, and the mud block content is less than or equal to 0.5 percent. The length of the polypropylene fiber is 12mm, and the length of the alkali-resistant glass fiber is 10 mm. The polycarboxylate superplasticizer is a polycarboxylate superplasticizer which is an ST-01A type polycarboxylate high-performance water reducer produced by Luoyang Junjiang building materials science and technology Limited company, the water reducing rate is not less than 25%, and the bleeding rate ratio is not more than 43%.
The preparation method of the disturbance resistant concrete of the embodiment comprises the following steps:
1) adding sulphoaluminate cement and slag powder into a stirrer, stirring for 30s at the rotating speed of 20rpm, then adding natural sand, and stirring for 20s at the stirring speed of 50rpm to prepare a first premix; mixing the first premix with 370kg of water, and stirring at a rotating speed of 45rpm for 1.5min to prepare a first slurry;
2) mixing cassava starch with 15kg of water, stirring for 20s at the rotating speed of 150rpm, then adding boric acid, stirring for 15s at the rotating speed of 120rpm, then adding polypropylene fiber and alkali-resistant glass fiber, stirring for 20s at the rotating speed of 100rpm, then adding a polycarboxylic acid water reducing agent and sulfonated lignin, stirring for 2min at the rotating speed of 50rpm, then adding sodium pyrophosphate and lithium chloride, and stirring for 25s at the rotating speed of 60rpm to prepare second slurry;
3) and then adding the second slurry into the first slurry, and stirring at the rotating speed of 100rpm for 20s to obtain the composite material.
Example 4
The disturbance-resistant concrete of the embodiment is prepared from the following raw materials in parts by weight: 1000kg of sulphoaluminate cement, 390kg of slag powder, 617kg of natural sand, 8kg of polypropylene fiber, 5kg of alkali-resistant glass fiber, 12kg of polycarboxylic acid water reducing agent, 6kg of sulfonated lignin, 3kg of boric acid, 6kg of tapioca starch, 4kg of sodium pyrophosphate, 3kg of lithium chloride and 395kg of water. The natural sand is 0.15-1.18mm continuous gradation natural sand. The mud content in the natural sand is less than or equal to 1.5 percent, and the mud block content is less than or equal to 0.5 percent. The length of the polypropylene fiber is 12mm, and the length of the alkali-resistant glass fiber is 10 mm. The polycarboxylate superplasticizer is a polycarboxylate superplasticizer which is an ST-01A type polycarboxylate high-performance water reducer produced by Luoyang Junjiang building materials science and technology Limited company, the water reducing rate is not less than 25%, and the bleeding rate ratio is not more than 43%.
The preparation method of the disturbance resistant concrete of the embodiment comprises the following steps:
1) adding sulphoaluminate cement and slag powder into a stirrer, stirring for 45s at the rotating speed of 15rpm, then adding natural sand, and stirring for 25s at the stirring speed of 50rpm to prepare a first premix; mixing the first premix with 380kg of water, and stirring at the rotating speed of 35rpm for 1.5min to prepare first slurry;
2) mixing cassava starch with 15kg of water, stirring for 30s at the rotating speed of 125rpm, then adding boric acid, stirring for 20s at the rotating speed of 110rpm, then adding polypropylene fiber and alkali-resistant glass fiber, stirring for 30s at the rotating speed of 80rpm, then adding a polycarboxylic acid water reducing agent and sulfonated lignin, stirring for 1.5min at the rotating speed of 70rpm, then adding sodium pyrophosphate and lithium chloride, and stirring for 30s at the rotating speed of 50rpm to prepare a second slurry;
3) and then adding the second slurry into the first slurry, and stirring at the rotating speed of 80rpm for 30s to obtain the composite material.
Example 5
The disturbance-resistant concrete of the embodiment is prepared from the following raw materials in parts by weight: 1000kg of sulphoaluminate cement, 405kg of slag powder, 625kg of natural sand, 12kg of polypropylene fiber, 4kg of alkali-resistant glass fiber, 11kg of polycarboxylic acid water reducing agent, 6kg of sulfonated lignin, 5kg of boric acid, 6kg of tapioca starch, 5kg of sodium pyrophosphate, 3kg of lithium chloride and 395kg of water. The natural sand is 0.15-1.18mm continuous gradation natural sand. The mud content in the natural sand is less than or equal to 1.5 percent, and the mud block content is less than or equal to 0.5 percent. The length of the polypropylene fiber is 12mm, and the length of the alkali-resistant glass fiber is 10 mm. The polycarboxylate superplasticizer is a polycarboxylate superplasticizer which is an ST-01A type polycarboxylate high-performance water reducer produced by Luoyang Junjiang building materials science and technology Limited company, the water reducing rate is not less than 25%, and the bleeding rate ratio is not more than 43%.
The preparation method of the disturbance resistant concrete of this example is the same as that of example 4.
Example 6
The disturbance-resistant concrete of the embodiment is prepared from the following raw materials in parts by weight: 1000kg of sulphoaluminate cement, 405kg of slag powder, 610kg of natural sand, 15kg of polypropylene fiber, 4kg of alkali-resistant glass fiber, 12kg of polycarboxylic acid water reducing agent, 5kg of sulfonated lignin, 5kg of boric acid, 5kg of tapioca starch, 5kg of sodium pyrophosphate, 3kg of lithium chloride and 395kg of water. The natural sand is 0.15-1.18mm continuous gradation natural sand. The mud content in the natural sand is less than or equal to 1.5 percent, and the mud block content is less than or equal to 0.5 percent. The length of the polypropylene fiber is 12mm, and the length of the alkali-resistant glass fiber is 10 mm. The polycarboxylate superplasticizer is a polycarboxylate superplasticizer which is an ST-01A type polycarboxylate high-performance water reducer produced by Luoyang Junjiang building materials science and technology Limited company, the water reducing rate is not less than 25%, and the bleeding rate ratio is not more than 43%.
The preparation method of the disturbance resistant concrete of this example is the same as that of example 4.
Comparative example 1
The concrete of this comparative example was made from the following raw materials by weight: 1000kg of sulphoaluminate cement, 400kg of slag powder, 600kg of natural sand, 12kg of polypropylene fiber, 14kg of polycarboxylic acid water reducing agent and 378kg of water. The natural sand is 0.15-1.18mm continuous gradation natural sand. The polypropylene fibers had a length of 12 mm. The polycarboxylate superplasticizer is a polycarboxylate superplasticizer which is an ST-01A type polycarboxylate high-performance water reducer produced by Luoyang Junjiang building materials science and technology Limited company.
The concrete of this comparative example was prepared by the method described in example 1.
Comparative example 2
The concrete of this comparative example was prepared from the same raw materials as in example 4.
The preparation method of this comparative example comprises the following steps: adding sulphoaluminate cement, slag powder and natural sand into a stirrer, stirring for 45s at the rotating speed of 15rpm, then adding polypropylene fiber, alkali-resistant glass fiber, polycarboxylic acid water reducing agent, sulfonated lignin, boric acid, cassava starch, sodium pyrophosphate and lithium chloride, stirring for 1.5min at the rotating speed of 70rpm, then adding water for mixing, and stirring for 1.5min at the rotating speed of 35rpm to obtain the high-performance aluminium sulphate aluminium cement.
Test examples
(1) The concrete prepared in example 4 was used to test the penetration resistance of the concrete during setting using a penetration resistance tester, and the test results are shown in fig. 1.
As can be seen from FIG. 1, the initial setting time and the final setting time of the concrete of the present invention are approximately 5 hours and 9 hours.
(2) The gas contents of the concrete in examples 1 to 6 and comparative examples 1 to 2 were measured in accordance with GB/T50080-2016, and the compressive strength under vibration conditions (vibration conditions: vibration frequency 11.32Hz, maximum vibration speed 28cm/s) was measured by an electromagnetic vibration table in accordance with the measuring method in GB/T50081-2002. The test results are as follows:
TABLE 1 comparison of concrete Performance test results in examples 1-6 and comparative examples 1-2
As can be seen from the above table, the concrete prepared by the invention can still maintain very high compressive strength under disturbed conditions, no cracks appear on the surface after severe vibration, and good disturbance resistance.
Claims (10)
1. An anti-disturbance concrete is characterized in that: the material is mainly prepared from the following raw materials in parts by weight: 1000 parts of sulphoaluminate cement, 415 parts of slag powder 390-; the retarder is at least one of sulfonated lignin, sodium pyrophosphate and starch.
2. The disturbance-resistant concrete according to claim 1, wherein: the material is mainly prepared from the following raw materials in parts by weight: 1000 parts of sulphoaluminate cement, 415 parts of slag powder, 580 parts of natural sand, 625 parts of reinforcing fiber, 10-15 parts of water reducing agent, 15-17 parts of retarder and 395 parts of water 385-; the retarder is at least one of sulfonated lignin, sodium pyrophosphate and starch.
3. The disturbance-resistant concrete according to claim 1, wherein: the reinforced fiber is at least one of polypropylene fiber and alkali-resistant glass fiber.
4. The disturbance-resistant concrete according to claim 3, wherein: the reinforcing fiber is prepared from polypropylene fibers and alkali-resistant glass fibers in a mass ratio of (1.2-4): 1.
5. The disturbance-resistant concrete according to claim 1, wherein: the retarder comprises sulfonated lignin and starch in a mass ratio of 1: 1.
6. The disturbance-resistant concrete according to claim 1, wherein: the raw material also comprises 2-8 parts by weight of a coagulation regulator, wherein the coagulation regulator is at least one of boric acid and lithium chloride.
7. A method of producing a disturbance resistant concrete according to any of claims 1 to 6, wherein: the method comprises the following steps:
1) mixing sulphoaluminate cement, slag powder, natural sand and water uniformly to prepare first slurry;
uniformly mixing the reinforced fibers, the water reducing agent, the retarder and water to prepare second slurry;
2) and uniformly mixing the first slurry and the second slurry to obtain the composite material.
8. The method for preparing the disturbance-resistant concrete according to claim 7, wherein: the step 1) of uniformly mixing the sulphoaluminate cement, the slag powder, the natural sand and the water is to uniformly mix the sulphoaluminate cement, the slag powder and the natural sand, and then add the water to uniformly mix.
9. The method for preparing the disturbance-resistant concrete according to claim 8, wherein: the sulphoaluminate cement, the slag powder and the natural sand are uniformly mixed, namely the sulphoaluminate cement and the slag powder are uniformly mixed and then are uniformly mixed with the natural sand.
10. The method for preparing the disturbance-resistant concrete according to claim 7, wherein: in the step 1), the reinforcing fiber, the water reducing agent, the retarder and the water are uniformly mixed, namely, the starch and the water are uniformly mixed, then the boric acid is added and uniformly mixed, then the reinforcing fiber is added and uniformly mixed, and then the water reducing agent is added and uniformly mixed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911341023.8A CN111039632A (en) | 2019-12-23 | 2019-12-23 | Anti-disturbance concrete and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911341023.8A CN111039632A (en) | 2019-12-23 | 2019-12-23 | Anti-disturbance concrete and preparation method thereof |
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| CN112851221A (en) * | 2021-02-08 | 2021-05-28 | 上海瑞史坦环保科技有限公司 | Anti-disturbance concrete and preparation method thereof |
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| CN102060488A (en) * | 2010-11-26 | 2011-05-18 | 同济大学 | Anti-disturbance concrete and preparation method thereof |
| US20140311387A1 (en) * | 2013-03-15 | 2014-10-23 | Hercules Incorporated | Hydraulic Composition With Prolonged Open Time |
| CN107117918A (en) * | 2016-02-25 | 2017-09-01 | 张彬 | A kind of quick setting and rapid hardening ungauged regions disturbance rejection self-compacting concrete and preparation method thereof |
| CN108546060A (en) * | 2018-06-28 | 2018-09-18 | 北京工业大学 | A kind of repairing high belite sulphoaluminate cement base anti-disturbance concrete and preparation method thereof |
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| CN102060488A (en) * | 2010-11-26 | 2011-05-18 | 同济大学 | Anti-disturbance concrete and preparation method thereof |
| US20140311387A1 (en) * | 2013-03-15 | 2014-10-23 | Hercules Incorporated | Hydraulic Composition With Prolonged Open Time |
| CN107117918A (en) * | 2016-02-25 | 2017-09-01 | 张彬 | A kind of quick setting and rapid hardening ungauged regions disturbance rejection self-compacting concrete and preparation method thereof |
| CN108546060A (en) * | 2018-06-28 | 2018-09-18 | 北京工业大学 | A kind of repairing high belite sulphoaluminate cement base anti-disturbance concrete and preparation method thereof |
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| CN112851221A (en) * | 2021-02-08 | 2021-05-28 | 上海瑞史坦环保科技有限公司 | Anti-disturbance concrete and preparation method thereof |
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Application publication date: 20200421 |