CN113387663A - Super early strength high-strength concrete and preparation method thereof - Google Patents
Super early strength high-strength concrete and preparation method thereof Download PDFInfo
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- CN113387663A CN113387663A CN202110625308.5A CN202110625308A CN113387663A CN 113387663 A CN113387663 A CN 113387663A CN 202110625308 A CN202110625308 A CN 202110625308A CN 113387663 A CN113387663 A CN 113387663A
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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
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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 application relates to super early strength high strength concrete, relates to building material technical field, and according to parts by weight, this super early strength high strength concrete includes: 770-790 parts of a cementing material, 650-670 parts of a coarse aggregate, 650-670 parts of a fine aggregate, 124-130 parts of an additive, 170-175 parts of water and 1-2 parts of a shrinkage-compensating agent; the admixture comprises 0.02-0.03 part of early strength component, 0.10-0.12 part of retarding component, 0.05-0.07 part of air-entraining and water-retaining component and 0.80-0.82 part of water-reducing component. The preparation method of the super early strength and high strength concrete comprises the following steps: uniformly stirring the coarse aggregate, the fine aggregate and the cementing material; adding the additive and the shrinkage-compensating agent, stirring and uniformly stirring; adding the water and stirring until slurry appears; and continuously stirring uniformly to obtain the super early strength and high strength concrete. The super early strength and high strength concrete prepared by the embodiment of the application has the 3h compressive strength of more than or equal to 55MPa, the 5h compressive strength of more than or equal to 65MPa and the 1d compressive strength of more than or equal to 80MPa, and solves the problems of long hardening time and slow strength growth of common concrete.
Description
Technical Field
The application relates to the technical field of building materials, in particular to super early strength and high strength concrete and a preparation method thereof.
Background
In modern bridge and road construction, local damage to a structure is usually repaired to ensure the quality safety of the structure. The traditional repairing process includes eliminating damaged concrete, roughening the interface, painting interface agent and casting new concrete. When the traditional process is adopted for repairing construction, the final setting time of the new concrete is generally more than 8-10 h, long-time discontinuous traffic is needed, and the adaptability to bridges or roads with high traffic pressure is poor.
In the related art, the pavement repair using the ordinary concrete with the strength slightly higher than the original concrete strength grade can be performed, and although the ordinary concrete can be solidified in a short time, the method also has many disadvantages, such as: (1) the common concrete has large shrinkage and serious cracking phenomenon; (2) the new and old concrete has poor bonding effect, the interface bonding strength of the new and old concrete is insufficient, and the new and old concrete is easy to crack; (3) the curing time of common concrete needs more than 14 days, and the traffic cannot be opened quickly. Along with the acceleration of social operation rhythm, quick repair and quick traffic become urgent expectations of society.
Disclosure of Invention
The embodiment of the application provides super early strength and high strength concrete and a preparation method thereof, and aims to solve the problems that common concrete is low in strength, long in hardening time and weak in interface bonding of new and old concrete in the related technology.
In a first aspect, a super early strength and high strength concrete is provided, which comprises the following components in parts by weight: 770-790 parts of a cementing material, 650-670 parts of a coarse aggregate, 650-670 parts of a fine aggregate, 124-130 parts of an additive, 170-175 parts of water and 1-2 parts of a shrinkage-compensating agent; the admixture comprises 0.02-0.03 part of early strength component, 0.10-0.12 part of retarding component, 0.05-0.07 part of air-entraining and water-retaining component and 0.80-0.82 part of water-reducing component.
In some embodiments:
the early strength component comprises lithium carbonate, the retarding component comprises sodium tetraborate, and the air-entraining and water-retaining component comprises organosilicon; the water reducing component comprises polycarboxylic organic matter and a cement base material;
according to the mass percentage, each part of the super early strength and high strength concrete comprises 0.11 to 0.16 percent of lithium carbonate; 0.53% to 0.63% of said sodium tetraborate; 0.26% to 0.37% of said silicone; 4.2 to 4.3 percent of polycarboxylic organic matter and cement base material.
In some embodiments, the weight ratio of the polycarboxylic organic substance to the cement-based base material is 1:4 to 1: 3.
In some embodiments, the admixture includes 0.25 parts of an early strength component, 0.12 parts of a set retarding component, 0.08 viscosity building component, and 0.45 parts of a water reducing component.
In some embodiments, 770 to 790 parts of the cementitious material comprises 150 to 170 parts Portland cement and 620 to 640 parts low alkali sulphoaluminate cement.
In some embodiments, the coarse aggregate comprises crushed stone, the fine aggregate comprises quartz sand, and the mass ratio of the crushed stone to the quartz sand is 1: 1-2: 3.
In some embodiments, the quartz sand comprises 20-40 mesh quartz sand and 40-70 mesh quartz sand, and the mass ratio of the two is 1: 1-2: 3.
In some embodiments, the mass ratio of the water to the cementitious material is 0.20 to 0.22.
In some embodiments, the shrinkage-compensating agent comprises MgO, and the mass ratio of the MgO to the ultra-early-strength high-strength concrete is 0.04-0.08.
In a second aspect, a method for preparing the super early strength and high strength concrete is provided, which comprises the following steps:
uniformly stirring the coarse aggregate, the fine aggregate and the cementing material;
adding the additive and the shrinkage-compensating agent, stirring and uniformly stirring;
adding the water and stirring until slurry appears;
and continuously stirring uniformly to obtain the super early strength and high strength concrete.
The beneficial effect that technical scheme that this application provided brought includes:
(1) the super early strength and high strength concrete prepared by the embodiment of the application has the 3h compressive strength of more than or equal to 55MPa, the 5h compressive strength of more than or equal to 65MPa and the 1d compressive strength of more than or equal to 80MPa, and solves the problems of long hardening time and slow strength growth of common concrete.
(2) The super early-strength high-strength concrete prepared by the embodiment of the application can still keep better fluidity and plasticity after being taken out of the machine for 30min, and does not need to be vibrated.
(3) The super early strength and high strength concrete prepared by the embodiment of the application has the 3h flexural strength more than or equal to 6.5MPa, and is particularly suitable for road pavement construction.
(4) The super early strength and high strength concrete prepared by the embodiment of the application has no shrinkage cracks after hardening, and the integrity of the concrete surface is better.
(5) The bonding strength ratio of the super early strength high-strength concrete prepared by the embodiment of the application to the old concrete is higher than 85%.
The embodiment of the application provides super early strength and high strength concrete and a preparation method thereof, cement, quartz sand, an additive and a compensation shrinking agent are added during preparation of the concrete, the cement is hydrated to form a cement stone structure, and the cement stone structure and aggregate provide strength required by the concrete structure; the quartz sand increases the compactness of concrete and improves the strength; the early strength component in the additive comprises lithium carbonate, and after the lithium carbonate is dissolved, carbonate ions react with calcium ions generated by hydration of cement to generate insoluble calcium carbonate, so that the hydration of the cement and the formation of a compact structure are promoted, and the strength is improved; the retarding component in the additive contains sodium tetraborate, after the sodium tetraborate is hydrolyzed, borate and calcium ions generate slightly soluble calcium borate to form a ball effect, so that the fluidity of concrete can be improved to a certain extent, and the formation of C-S-H gel is slowed down without influencing the total amount of the C-S-H gel; the water-retaining air-entraining component in the additive comprises organic silicon, the organic silicon comprises cement and C-S-H particles to form hydrophobic groups, the consistency of concrete is reduced, the wrapping property and the water-retaining property of the concrete are improved, and the workability is improved. The water reducing component in the admixture is mainly polycarboxylic organic matter, hydroxyl in the polycarboxylic organic matter has negative charge, and the polycarboxylic organic matter wraps cement particles to form negative charge groups which repel each other to play a role in lubrication, so that the water consumption is reduced, the water-cement ratio is reduced, and the concrete strength is improved; the compensating shrinking agent compensates the shrinkage of the concrete in the later hardening stage through self hydration volume expansion on one hand, and improves the bonding strength of the new and old concrete through micro expansion extrusion of the joint surface of the new and old concrete on the other hand.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The super early strength and high strength concrete provided by the embodiment of the application has the advantages of high early strength, fast strength growth, compression strength of more than or equal to 55MPa after 3h, no need of vibration during construction, no shrinkage crack after hardening, high breaking strength and high suitability for road pavement repair.
The super early strength and high strength concrete provided by the embodiment of the application can be used for repairing horizontal and vertical concrete structures, is particularly suitable for repairing parts with small repairing area and fast strength requirement increase, such as concrete pavements, precast concrete beam slabs and the like, and generally requires that the initial slump is not less than 200mm and the slump is not less than 180mm after 30 min.
The admixture of the embodiment of the application comprises 0.25 part of early strength component, 0.12 part of retarding component, 0.08 tackifying component and 0.45 part of water reducing component.
The super early strength and high strength concrete provided by the embodiment of the application has the weight ratio of water to the cementing material of 0.22.
The super early strength and high strength concrete provided by the embodiment of the application comprises 42.5-grade ordinary portland cement and 42.5-grade low-alkali sulphoaluminate cement.
The super early strength high strength concrete provided by the embodiment of the application has the crushed stone size grade of 5-16mm, and the crushing value index meets the requirements of national standard class I crushed stones.
According to the super early strength and high strength concrete provided by the embodiment of the application, the sand is 20-40 meshes and 40-70 meshes of quartz sand, the mixing proportion is 1: 1-2: 3, and the sand rate is 50%.
According to the super early strength and high strength concrete provided by the embodiment of the application, the main component of the shrinkage compensation agent is MgO, and the mass ratio of the MgO to the super early strength and high strength concrete is 0.04-0.08.
The super early strength and high strength concrete provided by the embodiment of the application takes mixing water as tap water.
Examples 1 to 4:
in examples 1 to 4, the admixture was 126 parts, each part of the admixture comprised 0.25 part of an early strength component, 0.12 part of a retarding component, 0.08 part of a viscosity increasing component and 0.45 part of a water reducing component, and a solid compounded component admixture was used. The shrinkage-compensating agent is 2 parts, the 20-40 mesh quartz sand is 329 parts, the 40-70 mesh quartz sand is 329 parts, the broken stone is 658 parts, the weight ratio of water to the cementing material is 0.22, and the water is 173 parts.
The method for preparing the super early strength and high strength concrete comprises the following steps:
s1: stirring the coarse aggregate, the fine aggregate and the cementing material uniformly;
s2: adding an additive and a shrinkage-compensating agent, stirring and uniformly stirring;
s3: adding water, stirring, and slowly stirring for 30s until slurry appears;
s4: continuously and rapidly stirring uniformly to obtain the super early strength and high strength concrete.
The compounding ratios of the components in examples 1 to 4 are shown in Table 1.
TABLE 1 composition of concrete (parts by mass)
The concrete prepared in the embodiment 1-4 is used for testing various performance indexes, wherein the performance indexes comprise 1h compressive strength, 5h compressive strength, 1d compressive strength, 3h flexural strength, 1d bond compressive strength ratio of new and old concrete, electric flux, slump and 30min slump loss. The test results are shown in Table 2.
The compression strength test method and the instrument are strictly executed according to GB/T50081 standard of common concrete mechanical property test method.
The flexural strength testing method and the instrument are strictly executed according to GB/T50081 standard of mechanical property testing method of common concrete.
The electric flux testing method and the electric flux testing instrument strictly follow GB/T50082 Standard test method for long-term performance and durability of common concrete.
The new and old concrete bonding compressive strength ratio is the ratio of the cubic compressive strength of the new and old concrete bonding test piece to the cubic compressive strength of the old concrete with the same mixing ratio, and the cubic compressive strength test method and the instrument are strictly executed according to GB/T50081 standard of common concrete mechanical property test method.
The slump test method and the slump test instrument strictly follow GB/T50080 Standard of Performance test methods of common concrete mixtures.
TABLE 2 test results of examples 1 to 4
From the results, the flexural strength of the concrete in the examples 1-4 is more than 6.5MPa in 3h, the bonding compressive strength ratio of the new concrete and the old concrete in 1d is more than 85%, the slump is more than 200mm, the slump loss is less than 30mm in 30min, and the electric flux is less than 900 ℃.
From the examples 1, 2 and 3, the early compressive strength of the super-early-strength and high-strength concrete can be improved by increasing the proportion of the sulphoaluminate cement in the cementing material, and the influence on the flexural strength is not obvious.
From examples 1 and 4, the proportion of ordinary portland cement in the cementitious material is increased, the early compressive strength of the super-early-strength and high-strength concrete is damaged, and the flexural strength is reduced.
From the above results, the compressive strengths of examples 3h, 5h and 1d other than example 4 were respectively greater than 55MPa, 65MPa and 80MPa, and the compressive strength of example 3 was the best.
Comparative examples 5 to 6:
the components of the cementing material, the aggregate, the shrinkage-compensating agent and the water in the comparative examples 5 to 6 are the same as those in the examples 1 to 4, the content of the additive is changed, and the super early strength and high strength concrete is prepared by the method.
The compounding ratios of the components in examples 5 to 6 are shown in Table 3.
TABLE 3 composition of concrete mix proportions (parts by mass)
And (3) testing various performance indexes of the concrete prepared in the comparative examples 5-6, wherein the performance indexes comprise 1h compressive strength, 5h compressive strength, 1d compressive strength, 3h flexural strength, 1d bond compressive strength ratio of new and old concrete, electric flux, slump and 30min slump loss. The test results are shown in Table 4.
TABLE 4 test results of examples 5 to 6
From the results of the example 3 and the comparative examples 5 to 6, the use amount of the additive is reduced, the early compressive strength and the flexural strength of the super-early-strength high-strength concrete and the bonding compressive strength ratio of the 1d new and old concrete are all obviously reduced, the electric flux is obviously increased, and the slump is reduced. The dosage of the additive is increased, the early compressive strength, the breaking strength and the bonding compressive strength ratio of 1d of the new and old concrete of the super early strength and high strength concrete are all reduced, the electric flux is increased, and the slump is increased.
Comparative examples 7 to 8:
comparative example 7 adopts a retarding high-performance water reducing agent produced by Jiangsu Orlaite New materials GmbH, the solid content is 20%, and the mass part is 24; comparative example 8A set-retarding type common water reducing agent produced by Hubei Tengten technology Limited is adopted, the solid content is 18%, and the mass portion is 30.
The compounding ratios of the components in comparative examples 7 to 8 are shown in Table 5.
TABLE 5 composition of concrete mix proportions (parts by mass)
And (3) testing various performance indexes of the concrete prepared in the comparative examples 7-8, wherein the performance indexes comprise 1h compressive strength, 5h compressive strength, 1d compressive strength, 3h flexural strength, 1d bond compressive strength ratio of new and old concrete, electric flux, slump and 30min slump loss. The test results are shown in Table 6.
TABLE 6 test results of examples 7 to 8
From comparative examples 7-8, common retarding admixtures on the market are adopted, so that the slump can meet the use requirement, but the early compressive strength and the flexural strength are low, the electric flux is high, and the use requirement is not met.
Comparative examples 9 to 10:
comparative example 9 on the basis of example 3, the mass part of the shrinkage-compensating agent is changed to 1 part; comparative example 10 on the basis of example 3, the mass ratio of 20-40 mesh quartz sand to 40-70 mesh quartz sand was changed, and 263 parts of 20-40 mesh quartz sand and 395 parts of 40-70 mesh quartz sand were used. The super early strength and high strength concrete is prepared by the method.
The compounding ratios of the components in comparative examples 9 to 10 are shown in Table 7.
TABLE 7 composition of concrete in proportions (parts by mass)
And (3) testing various performance indexes of the concrete prepared in the comparative examples 9-10, wherein the performance indexes comprise 1h compressive strength, 5h compressive strength, 1d compressive strength, 3h flexural strength, 1d bond compressive strength ratio of new and old concrete, electric flux, slump and 30min slump loss. The test results are shown in Table 8.
TABLE 8 composition of concrete in proportions (parts by mass)
From example 3 and comparative example 9, the dosage of the compensating shrinking agent is reduced, the early compressive strength and the flexural strength of the super early-strength high-strength concrete are slightly improved, and the bonding compressive strength ratio of 1d new and old concrete is slightly reduced.
From the example 3 and the comparative example 10, the change of the proportion of 20-40 meshes to 40-70 meshes of quartz sand in the fine aggregate has no obvious influence on the early compressive strength, the flexural strength, the bonding compressive strength ratio of 1d of the new and old concrete, the electric flux and the like of the super early strength high-strength concrete.
When the super early strength and high strength concrete is prepared, cement, quartz sand, an additive and a compensation shrinking agent are added, the cement is hydrated to form a cement stone structure, and the cement stone structure and aggregate provide strength required by a concrete structure; the quartz sand increases the compactness of concrete and improves the strength; the early strength component in the admixture improves the early strength of the concrete, the retarding component prolongs the hardening time of the concrete, the tackifying component improves the wrapping property of concrete slurry and improves the workability, the water reducing component reduces the water-cement ratio by reducing the water consumption, and the concrete strength is improved; the compensating shrinking agent compensates the shrinkage of the concrete in the later hardening stage through self hydration volume expansion on one hand, and improves the bonding strength of the new and old concrete through micro expansion extrusion of the joint surface of the new and old concrete on the other hand.
In the description of the present application, it is to be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The super early strength and high strength concrete is characterized by comprising the following components in parts by weight: 770-790 parts of a cementing material, 650-670 parts of a coarse aggregate, 650-670 parts of a fine aggregate, 124-130 parts of an additive, 170-175 parts of water and 1-2 parts of a shrinkage-compensating agent; the admixture comprises 0.02-0.03 part of early strength component, 0.10-0.12 part of retarding component, 0.05-0.07 part of air-entraining and water-retaining component and 0.80-0.82 part of water-reducing component.
2. The ultra early strength, high strength concrete of claim 1, wherein:
the early strength component comprises lithium carbonate, the retarding component comprises sodium tetraborate, and the air-entraining and water-retaining component comprises organosilicon; the water reducing component comprises polycarboxylic organic matter and a cement base material;
according to the mass percentage, each part of the super early strength and high strength concrete comprises 0.11 to 0.16 percent of lithium carbonate; 0.53% to 0.63% of said sodium tetraborate; 0.26% to 0.37% of said silicone; 4.2 to 4.3 percent of polycarboxylic organic matter and cement base material.
3. The ultra-early strength and high strength concrete according to claim 2, wherein the mass ratio of the polycarboxylic organic substance to the cement-based base material is 1:4 to 1: 3.
4. The ultra-early strength, high strength concrete of claim 1 wherein the admixture comprises 0.25 parts of the early strength component, 0.12 parts of the set retarding component, 0.08 parts of the viscosity increasing component and 0.45 parts of the water reducing component.
5. The ultra-early strength and high strength concrete according to claim 1, wherein 770 to 790 parts of the cementitious material comprises 150 to 170 parts of ordinary portland cement and 620 to 640 parts of low alkali sulphoaluminate cement.
6. The super early strength high strength concrete according to claim 1, wherein the coarse aggregate comprises crushed stone, the fine aggregate comprises quartz sand, and the mass ratio of the crushed stone to the quartz sand is 1: 1-2: 3.
7. The ultra-early strength and high strength concrete according to claim 6, wherein the quartz sand comprises 20-40 mesh and 40-70 mesh quartz sand, and the mass ratio of the two is 1: 1-2: 3.
8. The ultra-early strength and high strength concrete according to claim 1, wherein the mass ratio of the water to the cementitious material is 0.20 to 0.22.
9. The ultra-early-strength high-strength concrete according to claim 1, wherein the shrinkage-compensating agent comprises MgO, and the mass ratio of the MgO to the ultra-early-strength high-strength concrete is 0.04-0.08.
10. A method of making the ultra early strength, high strength concrete of claim 1, comprising the steps of:
uniformly stirring the coarse aggregate, the fine aggregate and the cementing material;
adding the additive and the shrinkage-compensating agent, stirring and uniformly stirring;
adding the water and stirring until slurry appears;
and continuously stirring uniformly to obtain the super early strength and high strength concrete.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104418550A (en) * | 2013-08-27 | 2015-03-18 | 青岛兴河建材有限公司 | Concrete solid pile |
| CN111574164A (en) * | 2020-05-26 | 2020-08-25 | 南京梦联桥材料科技有限公司 | Rapid repairing material for super-early-strength shrinkage compensation road bridge and preparation method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104418550A (en) * | 2013-08-27 | 2015-03-18 | 青岛兴河建材有限公司 | Concrete solid pile |
| CN111574164A (en) * | 2020-05-26 | 2020-08-25 | 南京梦联桥材料科技有限公司 | Rapid repairing material for super-early-strength shrinkage compensation road bridge and preparation method thereof |
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