CN114230279A - High slump loss resistant quick-hardening early-strength concrete and preparation method thereof - Google Patents
High slump loss resistant quick-hardening early-strength concrete and preparation method thereof Download PDFInfo
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- CN114230279A CN114230279A CN202111602401.0A CN202111602401A CN114230279A CN 114230279 A CN114230279 A CN 114230279A CN 202111602401 A CN202111602401 A CN 202111602401A CN 114230279 A CN114230279 A CN 114230279A
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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
- C04B28/04—Portland cements
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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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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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
- C04B2111/24—Sea water resistance
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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
- C04B2111/72—Repairing or restoring existing buildings or building materials
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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
- C04B2201/05—Materials having an early high strength, e.g. allowing fast demoulding or formless casting
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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
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- Chemical Kinetics & Catalysis (AREA)
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides high slump loss resistant quick-hardening early-strength concrete and a preparation method thereof, wherein the high slump loss resistant quick-hardening early-strength concrete comprises the following components in parts by weight: 100 parts of portland cement, 10 parts of mineral powder, 138 parts of sand 132-containing materials, 196 parts of crushed stone 190-containing materials, 0.88-1.1 parts of water reducing agent, 1.1-2.2 parts of early strength admixture and 28-31.4 parts of water, wherein the early strength admixture is an admixture with solid content of 40% and has a coagulation promoting and non-water reducing effect and is formed by compounding calcium nitrate and calcium nitrite according to a mass ratio of 1: 1. The invention effectively solves the contradiction between the working performance and the mechanical performance of the concrete, has the characteristics of good workability, small slump loss, quick setting time, high early strength and good pumping performance, the slump of the concrete in 1h is more than 200mm, the expansion is more than 400mm, the slump loss in 1h is less than or equal to 20mm, the compressive strength in 18h reaches more than 30MPa, and the compressive strength in 3d reaches more than 50MPa, has simple preparation method, can effectively shorten the construction period, meets the requirements of quick emergency inspection and rush repair of roads, bridges and tunnels, and the like, and is applied to engineering projects.
Description
Technical Field
The invention relates to the technical field of concrete engineering, in particular to high slump loss resistant quick-hardening early-strength concrete and a preparation method thereof.
Background
The quick-hardening early-strength concrete has the characteristics of high early strength, short setting time, good durability and the like, and is widely used in projects needing quick repair such as airport runways, emergency roads and the like, and projects such as bridge tunnels, harbor wharfs and the like for resisting seawater corrosion and quickly rush-repairing. The fast hardening sulphoaluminate cement with high initial strength is selected as the fast hardening early strength concrete, and the main component of the clinker mineral is C4A3S and C2S has the advantages of high strength, quick setting, low shrinkage, good durability such as impermeability and crack resistance, but the construction pouring difficulty is increased by using the special cement. C4A3The high hydration activity of S enables the concrete to obtain higher strength in the early stage, and the setting and hardening process can be completed within minutes, so that the actual pouring construction of the concrete is difficult to develop, and the pumping construction is particularly difficult. The price of the sulphoaluminate cement is far higher than that of the common Portland cement, so that the production cost is greatly increased.
Because the ordinary portland cement has long setting time and low early strength, the contradiction between the working performance and the early mechanical performance of the quick-hardening early-strength concrete in actual engineering needs to prepare the quick-hardening early-strength concrete which can give consideration to good working performance and mechanical performance.
Disclosure of Invention
The invention aims to overcome the contradiction between the working performance and the early mechanical property of the quick-hardening early-strength concrete in actual engineering, and provides the high slump-retaining quick-hardening early-strength concrete. The concrete prepared by the invention has the characteristics of good workability, small slump loss, quick setting time, high early strength and good pumping performance, the slump of the concrete in 1h is more than 200mm, the expansion is more than 400mm, the slump loss of 1h is less than or equal to 20mm, the compressive strength in 18h reaches more than 30MPa, and the compressive strength in 3d reaches more than 50MPa, and the preparation method is simple, can effectively shorten the construction period, and meets the requirements of rapid rush repair and rush repair of roads, bridges and tunnels and the like. In addition, the invention also provides a preparation method of the high slump loss resistant quick-hardening early-strength concrete.
In order to achieve the above objects and other related objects, the present invention adopts the following technical solutions:
the invention provides a high slump loss resistant quick-hardening early-strength concrete, which comprises the following components in parts by weight: 100 parts of portland cement, 10 parts of mineral powder, 138 parts of sand 132-containing materials, 196 parts of crushed stone 190-containing materials, 0.88-1.1 parts of water reducing agent, 1.1-2.2 parts of early strength agent and 28-31.4 parts of water, wherein the early strength agent is an additive with solid content of 40% and a coagulation promoting and non-water reducing effect and is formed by compounding calcium nitrate and calcium nitrite according to the mass ratio of 1:1, and the linear object of calcium nitrite at the initial stage of hydration and the calcium nitrate crystal are in a crosslinking effect, so that the hydration and coagulation processes of cement are promoted.
As a preferred technical scheme, the strength grade of the portland cement is 52.5.
As a preferable technical scheme, the sand is natural river sand or lake sand with fineness modulus of 2.3-3.0, mud content of less than or equal to 1.0%, mud content of less than or equal to 0.5% and chloride ion content of less than or equal to 0.006%.
As a preferred technical scheme, the broken stone is broken stone with the particle size of 5-20mm, the content of needle-shaped particles is less than or equal to 5 percent, the content of mud is less than or equal to 0.5 percent, and the content of mud blocks is less than or equal to 0.2 percent.
As a preferred technical scheme, the water reducing agent is a polycarboxylic acid high-performance water reducing agent.
As a preferred technical scheme, the single-side concrete comprises the following components in parts by weight: 500 kg of PII52.5 cement, 50 kg of S95 mineral powder, 153 kg of tap water, 690 kg of medium sand, 950 kg of crushed stone with the thickness of 5-20mm, 5.0 kg of polycarboxylic acid high-performance water reducing agent and 11.0 kg of early strength agent.
In a second aspect of the present invention, a method for preparing a high slump loss resistant quick-hardening early-strength concrete is provided, which is used for preparing the high slump loss resistant quick-hardening early-strength concrete, and comprises the following steps:
weighing raw materials according to the mixing proportion of claim 1;
step two, mixing and stirring the sand and the broken stones uniformly, adding the Portland cement and the mineral powder into the mixture, and dry-mixing for 1-2 min;
step three, mixing a polycarboxylic acid water reducing agent and tap water, adding the mixture obtained in the step 2, and stirring for 2-3 min;
and step four, adding the early strength agent into the mixture obtained in the step three, and continuously mixing for 1-2min to obtain the high slump loss resistant quick-hardening early strength concrete.
The invention prepares the fast-hardening early-strength concrete with coordinated and unified working performance and early strength by adopting the portland cement and adding the early strength agent with the functions of accelerating setting and resisting seepage: 1) after the calcium nitrate and the calcium nitrite are compounded into the cement paste, a net-shaped crystalline framework can be formed. In the cement hydration process, as the cement particles move thermally in the solution, a flocculent structure is formed under the action of a normal force. The mesh frameworks of the calcium nitrate and the calcium nitrite are interwoven with the flocculent structure of the cement, so that the cement forms a compact substance after hardening, and the final strength and the impermeability of the concrete are improved. 2) In the early stage of hydration, the wire-bound object and crystal cross-linking action of calcium nitrite can quickly occur along with the hydration action of cement, and the free water in the flocculated aggregate in the cement is adsorbed, so that the quick-hardening early-strengthening action on the concrete is shown. 3) The chlorine salt admixture, the sulfate admixture and the organic amine admixture all have early strength effects, but the later strength of the concrete is insufficient, and the later strength of the concrete can be obviously improved by compounding the calcium nitrate and the calcium nitrite. 4) The polycarboxylic acid high-performance water reducing agent is adopted, and carboxylic acid in the polycarboxylic acid high-performance water reducing agent and calcium ions in cement form a complex, so that the hydration time of the cement can be delayed, the slump retaining effect of the concrete is enhanced, and pumping construction is facilitated.
As described above, the present invention has the following advantageous effects:
(1) the quick-hardening early-strength concrete adopts the portland cement and is doped with the early strength agent with the coagulation accelerating effect, the setting time of the concrete can be adjusted, the early strength is promoted to be rapidly increased, the prepared concrete can effectively ensure that the slump in 1h is more than 200mm, the expansion degree is more than 400mm, the slump loss in 1h is less than or equal to 20mm, the compressive strength in 18h reaches more than 30MPa and the compressive strength in 3d reaches more than 50MPa, and the quick-hardening early-strength concrete can be widely used in projects needing rapid repair, such as airport runways, emergency roads and the like, bridges, tunnels, harbor wharfs and the like, and seawater corrosion resistance and rapid rush-construction and rush-repair projects.
(2) The quick-hardening early-strength concrete has the advantages of simple preparation method and low material cost, and can save the production cost for enterprises.
(3) The quick-hardening early-strength concrete has good fluidity, is beneficial to pumping construction, improves the construction efficiency and effectively shortens the construction period.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
In this example, no specific description is given, each raw material is not a commercially available product, and the early strength agent is an admixture having a solid content of 40% and a coagulation promoting non-water reducing effect, and is formed by compounding calcium nitrate and calcium nitrite in a mass ratio of 1: 1. The strength grade of the portland cement is 52.5. The sand is natural river sand or lake sand with fineness modulus of 2.3-3.0, mud content of less than or equal to 1.0%, mud block content of less than or equal to 0.5% and chloride ion content of less than or equal to 0.006%. The broken stone is 5-20mm in particle size, the content of needle-shaped particles is less than or equal to 5%, the content of mud is less than or equal to 0.5%, and the content of mud blocks is less than or equal to 0.2%. The water reducing agent is a polycarboxylic acid high-performance water reducing agent.
Example 1
The embodiment provides a preparation method of high slump loss resistant, quick-hardening and early-strength concrete, which comprises the following steps: (1) weighing 100 parts by mass of portland cement, 10 parts by mass of mineral powder, 31.4 parts by mass of tap water, 132 parts by mass of sand, 196 parts by mass of crushed stone, 1.1 parts by mass of polycarboxylic acid water reducing agent and 1.1 parts by mass of early strength agent; (2) mixing and stirring the sand and the crushed stone uniformly, adding the Portland cement and the mineral powder into the mixture, and dry-stirring for 1-2 min; (3) mixing a polycarboxylic acid water reducing agent and tap water, adding the mixture obtained in the step 2, and stirring for 2-3 min; (4) and (3) adding the early strength agent into the mixture obtained in the step (3), continuously stirring for 1-2min, and uniformly stirring to obtain the quick-hardening early strength concrete A.
Example 2
The embodiment provides a preparation method of high slump loss resistant, quick-hardening and early-strength concrete, which comprises the following steps: (1) weighing 100 parts by mass of portland cement, 10 parts by mass of mineral powder, 31 parts by mass of tap water, 132 parts by mass of sand, 196 parts by mass of crushed stone, 1.1 parts by mass of polycarboxylic acid water reducing agent and 1.65 parts by mass of early strength agent, (2) mixing and stirring the sand and the crushed stone uniformly, and adding the portland cement and the mineral powder into the mixture to be dry-mixed for 1-2 min; (3) mixing a polycarboxylic acid water reducing agent and tap water, adding the mixture obtained in the step 2, and stirring for 2-3 min; (4) and (3) adding the early strength agent into the mixture obtained in the step (3) and continuously stirring for 1-2min to obtain the quick-hardening early strength concrete B.
Example 3
The embodiment provides a preparation method of high slump loss resistant, quick-hardening and early-strength concrete, which comprises the following steps: (1) weighing 100 parts by mass of portland cement, 10 parts by mass of mineral powder, 30.6 parts by mass of tap water, 132 parts by mass of sand, 196 parts by mass of crushed stone, 1.1 parts by mass of polycarboxylic acid water reducing agent and 2.2 parts by mass of early strength admixture, and (2) mixing and stirring the sand and the crushed stone uniformly, adding the portland cement and the mineral powder into the mixture, and carrying out dry stirring for 1-2 min; (3) mixing a polycarboxylic acid water reducing agent and tap water, adding the mixture obtained in the step 2, and stirring for 2-3 min; (4) and (3) adding the early strength agent into the mixture obtained in the step (3), continuously stirring for 1-2min, and uniformly stirring to obtain the quick-hardening early strength concrete C.
Example 4
The embodiment provides a preparation method of high slump loss resistant, quick-hardening and early-strength concrete, which comprises the following steps: (1) weighing 100 parts by mass of portland cement, 10 parts by mass of mineral powder, 30.6 parts by mass of tap water, 138 parts by mass of sand, 190 parts by mass of crushed stone, 1.0 part by mass of polycarboxylic acid water reducing agent and 2.2 parts by mass of early strength admixture, (2) mixing and stirring the sand and the crushed stone uniformly, and then adding the portland cement and the mineral powder into the mixture to be dry-mixed for 1-2 min; (3) mixing a polycarboxylic acid water reducing agent and tap water, adding the mixture obtained in the step 2, and stirring for 2-3 min; (4) and (3) adding the early strength agent into the mixture obtained in the step (3), continuously stirring for 1-2min, and uniformly stirring to obtain the quick-hardening early strength concrete D.
Example 5
The embodiment provides a preparation method of high slump loss resistant, quick-hardening and early-strength concrete, which comprises the following steps: (1) weighing 100 parts by mass of portland cement, 10 parts by mass of mineral powder, 28 parts by mass of tap water, 138 parts by mass of sand, 190 parts by mass of crushed stone, 0.88 part by mass of polycarboxylic acid water reducing agent and 2.2 parts by mass of early strength admixture, and (2) adding the portland cement and the mineral powder into the mixture and dry-mixing for 1-2min after uniformly mixing and stirring the sand and the crushed stone; (3) mixing a polycarboxylic acid water reducing agent and tap water, adding the mixture obtained in the step 2, and stirring for 2-3 min; (4) and (3) adding the early strength agent into the mixture obtained in the step (3), continuously stirring for 1-2min, and uniformly stirring to obtain the quick-hardening early strength concrete E.
Performance test
The quick-hardening early-strength concrete prepared by the embodiment of the invention is subjected to performance detection according to GB/T50080-2016 and GB/T50081-2019, and specific test results are shown in Table 1.
TABLE 1 quick-hardening early-strength concrete Performance conditions
As can be seen from the data in Table 1, the quick-hardening early-strength concrete prepared in the embodiments 1 to 5 is high slump-retaining concrete, the working performance of the mixture is good, the loss of slump and expansion degree is small over time, the loss of the slump for 1h is less than or equal to 20mm, the pumping construction is easy, the early strength is high, and the compressive strength for 18h can reach more than 30 MPa. Along with the change of the mixing amount of the early strength agent and the water reducing agent and the sand rate in the mixing proportion, the working performance and the mechanical property of the concrete also change correspondingly, but the working performance and the mechanical property of the concrete both meet the requirements of high slump loss resistance and super early strength, and when the mixing amount of the early strength agent is 2.0 percent and the mixing amount of the water reducing agent is 0.9 percent, the compressive strength of the concrete is highest and the workability of a mixture is good.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. The high slump loss resistant quick-hardening early-strength concrete is characterized by comprising the following components in parts by weight: 100 parts of portland cement, 10 parts of mineral powder, 138 parts of sand 132-containing materials, 196 parts of crushed stone 190-containing materials, 0.88-1.1 parts of water reducing agent, 1.1-2.2 parts of early strength admixture and 28-31.4 parts of water, wherein the early strength admixture is an admixture with solid content of 40% and has a coagulation promoting and non-water reducing effect and is formed by compounding calcium nitrate and calcium nitrite according to a mass ratio of 1: 1.
2. A high slump loss fast setting early strength concrete according to claim 1, wherein the strength grade of the portland cement is 52.5.
3. The high slump loss resistant, quick-hardening and early strength concrete as claimed in claim 1, wherein the sand is natural river sand or lake sand with fineness modulus of 2.3-3.0, mud content of less than or equal to 1.0%, mud content of less than or equal to 0.5%, and chloride ion content of less than or equal to 0.006%.
4. The high slump loss resistant, quick-hardening and early strength concrete as claimed in claim 1, wherein the crushed stone is crushed stone with a particle size of 5-20mm, and has a needle-like particle content of 5% or less, a mud content of 0.5% or less, and a mud block content of 0.2% or less.
5. The high slump loss resistant, quick-hardening and early strength concrete according to claim 1, wherein the water reducing agent is a polycarboxylic acid high performance water reducing agent.
6. The high slump loss resistant rapid-hardening early strength concrete according to claim 1, wherein the single concrete comprises the following components by weight: 500 kg of PII52.5 cement, 50 kg of S95 mineral powder, 153 kg of tap water, 690 kg of medium sand, 950 kg of crushed stone with the thickness of 5-20mm, 5.0 kg of polycarboxylic acid high-performance water reducing agent and 11.0 kg of early strength agent.
7. A preparation method of high slump loss resistant quick-hardening early-strength concrete, which is used for preparing the high slump loss resistant quick-hardening early-strength concrete as claimed in any one of claims 1 to 6, and is characterized by comprising the following steps:
weighing raw materials according to the mixing proportion of claim 1;
step two, mixing and stirring the sand and the broken stones uniformly, adding the Portland cement and the mineral powder into the mixture, and dry-mixing for 1-2 min;
step three, mixing a polycarboxylic acid water reducing agent and tap water, adding the mixture obtained in the step 2, and stirring for 2-3 min;
and step four, adding the early strength agent into the mixture obtained in the step three, and continuously mixing for 1-2min to obtain the high slump loss resistant quick-hardening early strength concrete.
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| JP2018172236A (en) * | 2017-03-31 | 2018-11-08 | 太平洋マテリアル株式会社 | Rapid hardening concrete and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2018172236A (en) * | 2017-03-31 | 2018-11-08 | 太平洋マテリアル株式会社 | Rapid hardening concrete and production method thereof |
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| Title |
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| 蒋贵忠: "亚硝酸钙-硝酸钙的特性及其在外加剂中的应用", 《工业建筑》 * |
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