CN115073094B

CN115073094B - Special reinforced concrete capable of bearing force jointly for reinforcing building structure

Info

Publication number: CN115073094B
Application number: CN202210770554.4A
Authority: CN
Inventors: 徐凯
Original assignee: Shanghai Meichuang Architectural Materials Co ltd
Current assignee: Shanghai Meichuang Architectural Materials Co ltd
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2023-04-11
Anticipated expiration: 2042-06-30
Also published as: CN115073094A

Abstract

The invention relates to the field of concrete, in particular to the field of IPC 04B28, and more particularly relates to a special reinforced concrete capable of bearing force jointly for reinforcing a building structure, wherein the special reinforced concrete comprises the following components in parts by weight: 350-800 parts of cement, 400-900 parts of first aggregate, 500-900 parts of second aggregate, 0-100 parts of fly ash, 10-150 parts of mineral powder, 0.5-30 parts of ultrafine particles, 0.5-20 parts of attapulgite, 0.5-20 parts of bentonite, 0.5-40 parts of silica powder, 0-60 parts of shrinkage-compensating admixture, 0.1-3 parts of water reducing agent, 0.3-3 parts of functional additive and 150-220 parts of water. Through the proportion adjustment to each raw materials, carry out multiple intensity classification, consolidate the concrete through the special type of selecting different intensity, make concrete elastic modulus and intensity have positive correlation on the one hand, realized the elastic modulus with the primary structure and matchd, satisfied the demand of the different elastic modulus concrete in structural reinforcement engineering field, on the other hand has improved the early intensity of special type reinforced concrete, can reach design intensity in the short time, practiced thrift construction cycle.

Description

Special reinforced concrete capable of bearing force jointly for reinforcing building structure

Technical Field

The invention relates to the field of concrete, in particular to the field of IPC 04B28, and more particularly relates to special reinforced concrete capable of bearing force together for reinforcing a building structure.

Background

At present, the reinforcing industry mainly adopts common concrete or grouting material to reinforce the concrete structure. The common concrete is adopted for reinforcement, and the following defects exist: (1) the common stress effect is poor: the original component concrete shrinkage is finished, but the newly added concrete can shrink, so that the common stress effect of the new and old concrete is poor and the synergistic performance is poor during working; (2) poor ability to over-compact the reinforcing steel bars: the concrete has poor static homogeneity, dynamic homogeneity, poor slurry supporting and wrapping capacity and the like, so that the capability of the slurry wrapping the aggregate in a small space to penetrate through the dense steel bars is poor; (3) tissue type not applicable: the structural reinforcement consumption is small, the operation points are scattered, the common concrete is premixed commercial concrete and is transported to a construction site by a mixer truck, and the organization form is not suitable for the structural reinforcement project; (4) slow intensity increase: the strength of the common concrete is 28 days as a judgment standard, the strength development is slow, and the construction period is influenced.

And adopt the grouting material to reinforce, also can have following defect: (1) not being able to be stressed together: because the grouting material does not contain the first aggregate, the elasticity modulus and the mechanical property of the grouting material are not matched with those of concrete, and the grouting material cannot be stressed together with the original structure easily; (2) poor synergistic performance: the vertical expansion rate of the grouting material is inspected, and the grouting material is mainly characterized in that the vertical expansion rate is over-expanded in an early plastic stage and contracted in a later stage, so that the phenomenon of poor synergistic performance is easy to occur; (3) the risk of cracking is large: the grouting material is easy to crack in the later period due to the high cement content.

In the prior art, a patent document with an authorization publication number of CN 101445342B discloses a high-performance concrete material for structural engineering reinforcement, and a preparation method and application thereof, wherein the concrete has the characteristics of good fluidity, convenient construction, fast strength development, no shrinkage and the like, but the concrete has the defects of easy segregation, cracking and the like in the field of concrete reinforcement because of insufficient dynamic and static homogeneity, unmatched elastic modulus, insufficient expansibility, unknown bonding strength and the like.

Application publication No. CN 112341100A discloses a special concrete for structural reinforcement and a preparation method thereof, wherein the special concrete has the characteristics of self-compaction, no segregation, rapid development of early strength, controllable late strength, low shrinkage and the like, but the special concrete is low in homogeneity and unmatched in elastic modulus, so that the application of the special concrete in the situations of section increase, concrete replacement, newly-added members and the like is limited.

Patent document CN 101445342A discloses a special concrete for structural reinforcement and a preparation method thereof, however, the concrete has: the later strength is too high due to the single cementing material, and the cementing materials are not easy to bear force together; the uniformity is insufficient, and the casting application is limited due to easy segregation; the volume weight is too high, so that the slurry aggregate cannot pass through the dense steel bars at the same time; the restriction expansion rate is not clear, and the like.

Therefore, it is necessary to develop a special reinforced concrete capable of bearing force together for building structure reinforcement, which can give consideration to both the rigidity (compressive strength) and toughness (elastic modulus), has high homogeneity, adjustable elastic modulus, fast development of early strength, certain micro-expansion and strong adhesion, and is suitable for the field of building structure reinforcement.

Disclosure of Invention

In order to solve the problems, the applicant controls the bonding strength, the adjustable elastic modulus, the micro-expansion performance and the like of the concrete through formula design, improves the cooperative work capability of new and old concrete, ensures common stress, realizes the invention and obtains good reinforcement effect.

The invention provides a special reinforced concrete capable of bearing force together for reinforcing a building structure, which comprises the following components in parts by weight: 350-800 parts of cement, 400-900 parts of first aggregate, 500-900 parts of second aggregate, 0-100 parts of fly ash, 10-150 parts of mineral powder, 0.5-30 parts of ultrafine particles, 0.5-20 parts of attapulgite, 0.5-20 parts of bentonite, 0.5-40 parts of silica powder, 0-60 parts of shrinkage-compensating admixture, 0.1-3 parts of water reducer, 0.3-3 parts of functional additive and 150-220 parts of water.

The functional additive comprises 0-0.5 part of suspending agent, 0.1-1 part of adhesive, 0.1-1 part of air entraining agent and 0.1-1 part of defoaming agent.

Preferably, the special reinforced concrete capable of bearing force jointly for reinforcing the building structure comprises the following components in parts by weight: 350-600 parts of cement, 600-900 parts of first aggregate, 650-900 parts of second aggregate, 30-70 parts of fly ash, 30-100 parts of mineral powder, 2-20 parts of ultrafine particles, 2-15 parts of attapulgite, 2-15 parts of bentonite, 2-30 parts of silica powder, 30-50 parts of shrinkage-compensating admixture, 0.5-3 parts of water reducing agent, 0.3-3 parts of functional additive and 150-220 parts of water.

Preferably, the cement is one or more of portland cement and ordinary cement.

Preferably, the compressive strength of the cement after 28 days is 40-65MPa.

Preferably, the specification of the cement is selected from one or more of P.O.42.5, P.II.52.5, P.II 42.5R, P.II 52.5R, P.II 62.5 and P.II 62.5R; further preferably, the P.O.42.5 and/or the P.II.52.5.

Preferably, the first aggregate is selected from one or more of common basalt, limestone broken stone and basalt round stone; more preferably, basalt round stone.

Preferably, the first aggregate has a particle size of 1 to 30mm and an absolute volume of 0.10 to 0.45m per unit volume of the first aggregate ³ The grading condition is continuous grading, the mud content is less than or equal to 1 percent, the content of the needle-shaped flaky particles is less than or equal to 8 percent, the mud block content is less than or equal to 0.5 percent, and the water absorption rate is less than or equal to 2 percent; more preferably, the first aggregate has a particle size of 4.75 to 16mm and an absolute volume of 0.20 to 0.35m per unit volume of the first aggregate ³ The mud content is less than or equal to 0.5 percent, the needle-shaped flaky particle content is less than or equal to 1 percent, the mud block content is less than or equal to 0.1 percent, and the water absorption rate is less than or equal to 0.5 percent.

Preferably, the second aggregate is one or more of common river sand and dried sand; further preferably, the sand is dried sand.

Preferably, the mud content of the second aggregate is less than or equal to 2%, the water content is less than or equal to 5%, and the mud block content is less than or equal to 0.5%; more preferably, the second aggregate has a mud content of 0.5% or less, a water content of 2% or less, and a mud cake content of 0.1% or less.

The applicant has found that the use of amounts of the second and first aggregates described in the present application, mixed with ultrafine particles as part of the powder, allows the preparation of concrete having both rigidity (compressive strength) and toughness (modulus of elasticity). The grading effect among the ultrafine particles, the second aggregate and the first aggregate can reduce gaps among the aggregate particles, so that the use of cement slurry can be reduced, the cost is saved, the compactness, the strength and the workability of concrete can be improved, the optimal flowing performance is presented, the concrete is endowed with the characteristics of high mechanical strength, strong cracking resistance and strong homogeneity, and the rigidity (compressive strength) and the toughness (elastic modulus) of the concrete are both considered, so that the application efficiency is high.

Preferably, the fly ash is one or more of class I fly ash, class II fly ash and class III fly ash; further preferred is class II fly ash.

Preferably, the ore powder is one or more of S95-grade ore powder, S75-grade ore powder and S105-grade ore powder; more preferably, the ore powder is S95-grade ore powder.

Preferably, the ultrafine particles are selected from one or more of ultrafine mineral powder, ultrafine cement and ultrafine coal ash; further preferably, the material is superfine mineral powder, superfine cement and superfine coal ash.

Preferably, the weight ratio of the superfine mineral powder to the superfine cement to the superfine coal ash is (1-2): (1-2): (1-2); further preferred is 2.

Preferably, the particle diameter D50 of the ultrafine particles is less than or equal to 15 mu m, and the fineness is more than or equal to 700m ² Per kg; more preferably, the D50 of the ultrafine particles is less than or equal to 9 mu m, and the fineness is more than or equal to 600m ² /kg。

Preferably, the initial setting time of the superfine cement is more than or equal to 15min, the final setting time is less than or equal to 360min, the flexural strength of the superfine cement is more than or equal to 4.0MPa in 3 days, the flexural strength of the superfine cement is more than or equal to 6.5MPa in 28 days, the compressive strength of the superfine cement is more than or equal to 21MPa in 3 days, and the compressive strength of the superfine cement is more than or equal to 42.5MPa in 28 days.

Preferably, the superfine mineral powder is S95-grade mineral powder with the particle size D50 of less than or equal to 9 mu m.

Preferably, the ultrafine coal ash is class II fly ash of S95 class with the particle size D50 of less than or equal to 9 microns.

During the structural reinforcement, receive the influence of cross-section width and reinforcing bar density, need the concrete to possess better homogeneity, just can ensure the ability of the intensive reinforcing bar in self-compaction concrete undersize space, promote aggregate suspension performance, guarantee to pour the effect. The applicant believes that in the structural reinforcement, the influence of structural stress and construction period is considered, and the construction period can be saved by reaching the stress strength in advance. The applicant has found that the particle size D50 is not more than 15 μm and the fineness is not less than 700m ² /kg, and the weight ratio is (1-2): (1-2): the superfine mineral powder, the superfine cement and the superfine coal ash in the step (1-2) are used as superfine particles to be applied to concrete raw materials and are compounded with a certain amount of silicon powder and a suspending agent with 15000-30000 meshes, so that on one hand, the early strength can be improved, the strength curve can be changed, the holes can be plugged, the concrete is aerated, the fluidity and the workability of the special reinforced concrete can be improved, the suspension capacity of the aggregate can be improved, the pouring effect can be ensured, on the other hand, the homogeneity of the special reinforced concrete can be improved, and the bleeding rate of the special reinforced concrete is 0.

Preferably, the fineness of the attapulgite and the bentonite is 250-400 meshes, and the water content is less than or equal to 20%; more preferably, the fineness of the attapulgite and the bentonite is 325 meshes, and the water content is less than or equal to 13%.

Preferably, the bentonite is one or more of calcium bentonite, sodium bentonite, organic bentonite and hydrogen bentonite; more preferably, the bentonite is calcium bentonite.

Preferably, the weight ratio of the attapulgite to the bentonite is (1-2): (1-2).

In the structural reinforcement, the bonding strength of newly poured concrete is increased, not only can the generation of new and old interface gaps be prevented, but also the bonding capacity with reinforcing steel bars can be increased. In order to meet the cohesiveness and water-retaining lubricity of concrete, the applicant adds a certain amount of attapulgite and bentonite, the fineness of the attapulgite and the bentonite is 250-400 meshes, the water content is less than or equal to 20%, and by controlling the proportion of the attapulgite and the bentonite and adding a certain amount of latex powder with the solid content of more than or equal to 95% as an adhesive, the water-retaining lubricity of the concrete can be controlled while the bonding strength of newly poured concrete and an original structure is increased, and the basic characteristics of moisture absorption expansion, plasticity, adhesiveness and the like are adjusted.

Preferably, the fineness of the silicon powder is 15000-30000 meshes; more preferably, the mesh size is 20000 to 25000.

Preferably, the shrinkage-compensating admixture is one or more of bauxite, calcined alum, UEA and HEA; more preferably, UEA and HEA.

The weight ratio of UEA to HEA is 1: (1-3); further preferably, the ratio is 1.

The newly added structure needs to ensure certain volume expansion, and the synergistic effect with the original structure can be realized. In order to meet the requirement of micro-expansion performance in the field of structural reinforcement engineering, the invention selects the components with the weight ratio of 1: the UEA and the HEA in (1-3) are used as compensation shrinkage admixtures, so that the micro-expansion performance is ensured, the concrete-reinforced composite material can actively participate in the work in the structural stress, the joint stress of new and old concrete is ensured, and the cracking phenomenon can not occur when the working conditions of section enlargement, concrete replacement, new component addition and the like are carried out.

Preferably, the water reducing agent is one or more of a naphthalene concrete water reducing agent and a polycarboxylic acid concrete water reducing agent; more preferably, the water reducing agent is a polycarboxylic acid concrete water reducing agent.

Preferably, the polycarboxylic acid concrete water reducing agent is selected from one or more of an ether polycarboxylic acid water reducing agent and an ester polycarboxylic acid water reducing agent; further preferably, the water reducing agent is an ether polycarboxylic acid water reducing agent or an ester polycarboxylic acid water reducing agent.

Preferably, the weight ratio of the ether polycarboxylic acid water reducer to the ester polycarboxylic acid water reducer is (1-2): (1-2); further preferably, the ratio is 1.

The ether polycarboxylic acid water reducing agent and the ester polycarboxylic acid water reducing agent are compounded, so that the problem of easy segregation can be solved, the water sensitivity of field water addition is reduced, and the capability of over-compacting reinforcing steel bars is improved.

Preferably, the functional additive comprises 0-0.5 part of suspending agent and 0.1-1 part of adhesive; 0.1-1 part of air entraining agent; 0.1-1 part of defoaming agent.

Preferably, the suspending agent is one or more of cellulose ether and polyacrylamide.

Preferably, the adhesive is one or more of epoxy resin and latex powder; further preferably, the latex powder.

Preferably, the solid content of the adhesive is greater than or equal to 95%; more preferably, it is not less than 98%.

Preferably, the air entraining agent is one or more of rosin resins, alkyl sulfonic acids and saponins; further preferably, the saponin is saponins.

Preferably, the saponin air entraining agent is triterpenoid saponin.

In order to meet the requirements of fluidity and filling capacity in the field of structural reinforcement engineering, the ether ester compound polycarboxylate superplasticizer selected by the invention is silicon powder with the fineness of 15000-30000 meshes, the particle diameter D50 of less than or equal to 15 mu m and the fineness of more than or equal to 700m ² The/kg ultrafine particles, the attapulgite and the triterpenoid saponin air entraining agent play a perfect synergistic role, the problem of chromatography is solved, the flow performance of the special reinforced concrete is improved, the pouring effect is ensured, and the range of the expansion degree is ensured.

Preferably, the defoaming agent is one or more of an organic silicon defoaming agent and a polyether defoaming agent; further preferably, it is a silicone antifoaming agent.

The use of the defoaming agent has the effects of reducing the volume weight, improving the construction property and avoiding the common phenomenon of sticking and death in the concrete construction process. While also helping to improve the ability to pass through dense rebar.

Preferably, the fluidity and filling property of the special reinforced concrete are as follows: the expansion degree is more than or equal to 600 and less than or equal to 720, and the filling ratio of the L-shaped instrument is more than or equal to 0.9; workability and homogeneity are shown as follows: the bleeding rate is 0, and the volume weight is controlled to be 2160-2400kg/m3; the steel bar passing capacity is represented as follows: the difference between the slump expansion degree and the J ring expansion degree is less than or equal to 25mm; the difference of the elastic modulus of the newly added structure and the original structure is less than or equal to 10 percent; the micro-expansion performance is shown as follows: the 14d value in the limited expansion rate water is more than or equal to 0.025 percent, and the 14d value in the water is more than or equal to-0.20 percent when the water is converted into 28d value in the air; the bonding strength is more than or equal to 1.2MPa.

The second aspect of the invention provides a preparation process of special reinforced concrete capable of bearing force together for reinforcing a building structure, which comprises the following steps: the method comprises the following steps:

s2, pre-mixing the parts except the first aggregate and the second aggregate in the raw materials by using a powder mixer, and mixing the pre-mixed materials into bagged powder;

s2, packaging the first aggregate and the second aggregate into bagged aggregate in a metering way;

and S3, adding water into the bagged powder and the bagged aggregate according to a proportion, stirring and mixing, and finally pouring.

Composition and performance gain effects:

1. according to the invention, 350-800 parts of cement, 400-900 parts of first aggregate, 500-900 parts of second aggregate, 0-100 parts of fly ash, 0-150 parts of mineral powder, 0-30 parts of ultrafine particles, 0-20 parts of attapulgite, 0-20 parts of bentonite, 0-40 parts of silica powder, 0-60 parts of shrinkage-compensating admixture, 0-3 parts of water reducing agent, 0-3 parts of functional admixture and 0-400 parts of water are selected as raw materials of the special reinforced concrete, and various strength grading is carried out by adjusting the mixing proportion, so that the elastic modulus and the strength of the concrete have positive correlation, the elastic modulus matching with the original structure is realized, the requirements of different elastic modulus concretes in the field of structural reinforcement engineering are met, the elastic modulus is similar to that of the original structure, and the common stress of new and old structures can be promoted. On the other hand, the early strength of the special reinforced concrete is improved, the design strength can be achieved in a short time, and the construction period is saved.

2. By selecting the grain diameter D50 of less than or equal to 15 mu m and the fineness of more than or equal to 700m ² Kg, and the weight ratio is (1-2): (1-2): (1-2) the ultrafine mineral powder, the ultrafine cement and the ultrafine coal ash are used as ultrafine particles to be applied to concrete raw materials and are compounded with a certain amount of silicon powder of 15000-30000 meshes and a suspending agent, so that on one hand, the early strength can be improved, and on the other hand, the early strength is improvedThe strength curve is changed, so that the holes are effectively blocked, and the gas content of the concrete is promoted; on the other hand, the homogeneity, the fluidity and the workability of the special reinforced concrete are improved, the suspension performance of the aggregate and the healing capacity of the reinforcing steel bar are improved, and the pouring effect is ensured.

3. By selecting a certain amount of the second aggregate and the first aggregate, which are described in the application, and mixing the second aggregate and the first aggregate with the ultrafine particles to form a part of powder, the prepared concrete has rigidity (compressive strength) and toughness (elastic modulus). The grading effect among the ultrafine particles, the second aggregate and the first aggregate can reduce gaps among the aggregate particles, so that the use of cement slurry can be reduced, the cost is saved, the compactness, the strength and the workability of concrete can be improved, the optimal flowing performance is presented, the concrete is endowed with the characteristics of high mechanical strength, strong cracking resistance and strong homogeneity, and the rigidity (compressive strength) and the toughness (elastic modulus) of the concrete are both considered, so that the application efficiency is high.

4. The selected attapulgite and bentonite have the fineness of 250-400 meshes and the water content of less than or equal to 20 percent, and the water-retaining lubricity of the concrete can be controlled and the cohesiveness is improved while the bonding strength of the newly poured concrete and the original structure is increased by controlling the proportion of the attapulgite and the bentonite and adding a certain amount of latex powder with the solid content of more than or equal to 95 percent as a bonding agent.

5. By selecting ether ester compound polycarboxylate superplasticizer as the water reducing agent, and mixing with silicon powder with the fineness of 15000-30000 meshes, the particle diameter D50 of less than or equal to 15 mu m and the fineness of more than or equal to 700m ² The/kg ultrafine particles, the attapulgite and the triterpenoid saponin air entraining agent have synergistic effect, so that the water sensitivity of a construction site is reduced, the flowing property of the special reinforced concrete is improved, the pouring effect is ensured, and the range of the expansion degree is ensured. When the initiator is used, the volume weight is further effectively reduced, the heat and sound insulation performance is improved, and the workability is improved.

6. Selecting a raw material with the weight ratio of 1: the UEA and the HEA in (1-3) are used as compensation shrinkage admixtures, so that the micro-expansion performance is ensured, the concrete-reinforced composite material can actively participate in working in structural stress, the common stress of new and old concrete is ensured, and the cracking phenomenon can not occur under the working conditions of section enlargement, concrete replacement, new added members and the like.

The structure-activity relationship is obtained as follows:

1. the concrete meets the common stress requirement in the field of structural reinforcement engineering: according to the invention, the capability of cooperative work of new and old concrete is improved by controlling the bonding strength, the adjustable elastic modulus, the micro-expansion performance and the like, the common stress is ensured, and a good reinforcing effect is realized.

2. The concrete meets the requirements of fluidity and filling capacity in the field of structural reinforcement engineering: according to the invention, by adding the water reducing agent, the silica fume, the ultrafine particles, the attapulgite, the air entraining agent and the like, the flow property of the special reinforced concrete is improved, the pouring effect is ensured, the expansion degree is more than or equal to 600 and less than or equal to 720, the filling ratio of the L-shaped instrument is more than or equal to 0.9, as shown in figure 2.

3. The concrete meets the requirements of workability and homogeneity in the field of structural reinforcement engineering, the aggregate is suspended in the mixture through silicon powder, attapulgite, a suspending agent, ultrafine particles, an air entraining agent and the like, the dynamic homogeneity and the static homogeneity of the special reinforced concrete are improved, the bleeding rate of the special reinforced concrete is ensured to be 0, and the volume weight is controlled to be 2160-2400kg/m ³ 。

4. The concrete meets the requirement of the field of structural reinforcement engineering on the rapid healing capability of reinforcing steel bars, the suspension performance of aggregate and the rapid healing capability of reinforcing steel bars are improved by adding a water reducing agent, silicon powder, ultrafine particles, attapulgite, an air entraining agent and the like, the pouring effect is ensured, and the difference between the slump expansion degree and the J-ring expansion degree is less than or equal to 25mm, as shown in figure 1.

5. The concrete meets the elastic modulus in the field of structural reinforcement engineering, and the elastic modulus of special reinforced concrete is adjusted by adding an adhesive, optimizing the mix proportion design and the like; meanwhile, special reinforced concrete with different strengths and elastic moduli is selected through strength grading, so that the elastic modulus of the reinforced concrete is matched with that of the original structure, and the reinforced concrete has the characteristic of being stressed together with the original structure.

6. The concrete provided by the invention meets the micro-expansion performance in the field of structural reinforcement engineering, and in the field of building structural reinforcement, because the original concrete structure is already shrunk, the newly poured concrete can realize the synergistic effect with the original structure only if a certain volume expansion needs to be ensured in the newly added structure. The invention realizes micro-expansion by adjusting the mixing amount of the expanding agent, ensures the common stress of new and old concrete, and ensures that the 14d value in the water with the limited expansion rate is more than or equal to 0.025 and the 28d value in the air converted from 14d in the water is more than or equal to-0.20.

7. The concrete provided by the invention meets the bonding performance in the field of structural reinforcement engineering, and in the structural reinforcement, the bonding strength of newly poured concrete is increased, so that not only can the generation of new and old interface gaps be prevented, but also the bonding capacity with reinforcing steel bars can be increased. The invention increases the bonding strength between the newly poured concrete and the original structure by adding a proper amount of adhesive, and the bonding strength is more than or equal to 1.2MPa.

8. The concrete provided by the invention meets the early strength performance in the field of structural reinforcement engineering, and by adding ultrafine particles, ultrafine cement, silica powder, 62.5R cement, fly ash and the like, the early hydration speed of the cement is promoted, the early strength is improved, and the development of the later strength is controlled. The requirement for early strength in the structural reinforcement has been satisfied, can not appear again because of later stage intensity is too high, can not with the common atress's of original structure the condition.

The special reinforced concrete capable of bearing force together for reinforcing the building structure is suitable for the field of reinforcing the building structure, and specifically comprises working conditions of increasing the section, replacing concrete, newly adding members and the like of an existing building and a structure; it is also suitable for concrete members with special requirements in new construction.

Drawings

FIG. 1 is a schematic diagram showing the calculation of the difference between slump expansion and J-ring expansion;

FIG. 2 is a schematic diagram of the calculation of filling ratio of the L-shaped instrument;

FIG. 3 is a graph comparing the increase curves of compressive strength of example 1 and comparative example 1.

Detailed Description

Examples

Example 1

Embodiment 1 provides a special reinforced concrete capable of being stressed together for reinforcing a building structure, which comprises the following components in parts by weight: 420 parts of cement, 864 parts of first aggregate, 766 parts of second aggregate, 42 parts of fly ash, 51 parts of mineral powder, 5 parts of ultrafine particles, 4 parts of attapulgite, 4 parts of bentonite, 5 parts of silica powder, 40 parts of shrinkage-compensating admixture, 1.5 parts of water reducing agent, 0.46 part of functional admixture and 175 part of water.

The cement is portland cement.

The compressive strength of the cement after 28 days is 42.5Mpa.

The cement is selected from cement with the specification of P.O.42.5.

The first aggregate is basalt roundstone.

The first aggregate has a particle size of 4.75-16mm and an absolute volume of 0.20-0.35m ³ The grading condition is continuous grading, the mud content is less than or equal to 0.5%, the needle-shaped and flaky particle content is less than or equal to 1%, the mud block content is less than or equal to 0.1%, and the water absorption rate is less than or equal to 0.5%.

The second aggregate is dried sand.

The mud content of the second aggregate is less than or equal to 0.5%, the water content is less than or equal to 2%, and the mud block content is less than or equal to 0.1%.

The fly ash is class II fly ash.

The mineral powder is S95 grade mineral powder.

The superfine particles are the mixture of superfine mineral powder, superfine cement and superfine coal ash.

The weight ratio of the superfine mineral powder to the superfine cement to the superfine coal ash is 2.

The particle diameter D50 of the superfine particles is less than or equal to 9 mu m, and the fineness is more than or equal to 600m ² /kg。

The initial setting time of the superfine cement is more than or equal to 15min, the final setting time is less than or equal to 360min, the flexural strength of the superfine cement is more than or equal to 4.0MPa in 3 days, the flexural strength of the superfine cement is more than or equal to 6.5MPa in 28 days, the compressive strength of the superfine cement is more than or equal to 21MPa in 3 days, and the compressive strength of the superfine cement is more than or equal to 42.5MPa in 28 days.

The superfine mineral powder is S95-grade mineral powder with the particle size D50 of less than or equal to 9 mu m.

The superfine coal ash is S95 level II fly ash with the particle size D50 of less than or equal to 9 mu m.

The fineness of the attapulgite and the bentonite is 325 meshes, and the water content is less than or equal to 13%.

The bentonite is calcium bentonite.

The fineness of the silicon powder is 20000 meshes.

The shrinkage-compensating admixtures are UEA and HEA.

The weight ratio of UEA to HEA is 1.

The UEA is common HQ-UEA sold in the market, and the HEA is a common HEA expanding agent sold in the market.

The polycarboxylic acid concrete water reducing agent is an ether polycarboxylic acid water reducing agent and an ester polycarboxylic acid water reducing agent.

The weight ratio of the ether polycarboxylic acid water reducer to the ester polycarboxylic acid water reducer is 1.

The ether polycarboxylic acid water reducing agent is a common ether polycarboxylic acid water reducing agent sold in the market.

The ester polycarboxylic acid water reducing agent is a common polycarboxylic acid ester water reducing agent sold in the market.

The functional additive comprises, by weight, 0.03 part of a suspending agent, 0.2 part of an adhesive, 0.03 part of an air entraining agent and 0.2 part of a defoaming agent.

The suspending agent is cellulose ether.

The suspending agent is common hydroxypropyl methyl cellulose powder sold in the market.

The adhesive is latex powder.

The solid content of the adhesive is more than or equal to 98 percent.

The adhesive is common latex powder sold in the market.

The air entraining agent is saponins.

The saponin air entraining agent is triterpenoid saponin.

The air entraining agent is common triterpenoid saponin sold in the market.

The defoaming agent is an organic silicon defoaming agent.

The defoaming agent is a commercially available defoaming agent N-10.

s2, packaging the first aggregate and the second aggregate into bagged aggregate in a metering manner;

Example 2

Embodiment 2 provides a but building structure consolidates with special reinforced concrete of atress jointly, and embodiment 1 is with embodiment, the difference lies in: comprises the following components in parts by weight: 350 parts of cement, 900 parts of first aggregate, 900 parts of second aggregate, 0 part of fly ash, 10 parts of mineral powder, 0.5 part of ultrafine particles, 0.5 part of attapulgite, 0.5 part of bentonite, 0.5 part of silica powder, 0 part of shrinkage-compensating admixture, 0.1 part of water reducer, 0.3 part of functional additive and 220 parts of water.

The functional additive comprises 0.1 part of adhesive, 0.1 part of air entraining agent and 0.1 part of defoaming agent.

Example 3

Embodiment 3 provides a but building structure consolidates with special reinforced concrete of atress jointly, and embodiment 1 is with embodiment, the difference lies in: the material comprises, by weight, 800 parts of cement, 400 parts of first aggregate, 500 parts of second aggregate, 100 parts of fly ash, 150 parts of mineral powder, 30 parts of ultrafine particles, 20 parts of attapulgite, 20 parts of bentonite, 40 parts of silica powder, 60 parts of shrinkage-compensating admixture, 3 parts of water reducing agent, 3 parts of functional admixture and 150 parts of water.

The functional additive comprises, by weight, 0.5 part of a suspending agent, 1 part of an adhesive, 1 part of an air entraining agent and 0.5 part of a defoaming agent.

Example 4

Embodiment 4 provides a building structure consolidates with special type reinforced concrete that can atress jointly, and embodiment 1 is the same, the difference lies in: the water reducing agent is a naphthalene water reducing agent.

The naphthalene water reducer is a commercially available common naphthalene powder water reducer.

Example 5

Embodiment 5 provides a special reinforced concrete capable of bearing force jointly for reinforcing a building structure, and the specific implementation manner is the same as that of embodiment 1, and the difference is that: the superfine particles are the mixture of superfine mineral powder and superfine cement.

The weight ratio of the superfine mineral powder to the superfine cement is 2.

Example 6

Embodiment 6 provides a but building structure consolidates with special type reinforced concrete of atress jointly, and embodiment 1 is with the concrete implementation mode, and the difference lies in: the weight ratio of the superfine mineral powder to the superfine cement to the superfine coal ash is 3.

Example 7

Embodiment 7 provides a special reinforced concrete capable of bearing force together for reinforcing a building structure, and the specific implementation manner is the same as that of embodiment 1, and the difference is that: the weight ratio of the superfine mineral powder to the superfine cement to the superfine coal ash is 1.

Example 8

Embodiment 8 provides a but building structure consolidates with special reinforced concrete of atress jointly, and embodiment 1 is with embodiment 1, the difference lies in: the weight ratio of the superfine mineral powder to the superfine cement to the superfine coal ash is 1.

Example 9

Embodiment 9 provides a but building structure consolidates special type reinforced concrete of atress jointly, and embodiment 1 is with embodiment 1, the difference lies in: 8 parts of attapulgite and 0 part of bentonite in parts by weight.

Example 10

Embodiment 10 provides a special reinforced concrete that can bear force jointly for building structure reinforcement, and the difference between the specific implementation manner and embodiment 1 is: 0 part of attapulgite and 8 parts of bentonite in parts by weight.

Example 11

Embodiment 11 provides a but building structure consolidates special type reinforced concrete of atress jointly, and embodiment is the same as embodiment 1, and the difference lies in: the weight ratio of UEA to HEA is 2.

Example 12

Embodiment 12 provides a special reinforced concrete that can bear force jointly for building structure reinforcement, and the difference between the specific implementation manner and embodiment 1 is: the shrinkage-compensating blend is UEA.

Example 13

Embodiment 13 provides a but building structure consolidates special type reinforced concrete of atress jointly, and embodiment is the same as embodiment 1, and the difference lies in: the shrinkage-compensating blend is HEA.

Example 14

Embodiment 14 provides a special reinforced concrete capable of bearing force together for reinforcing a building structure, and the specific implementation manner is the same as that of embodiment 1, except that: the first aggregate is common basalt, and the content of needle flake particles of the first aggregate is less than or equal to 8%.

Example 15

Embodiment 15 provides a but building structure consolidates special type reinforced concrete of atress jointly, and embodiment is the same as embodiment 1, and the difference lies in: the grain diameter of the first aggregate is 15-25mm, and the grading condition is continuous grading.

Example 16

Embodiment 16 provides a special reinforced concrete capable of bearing force together for reinforcing a building structure, and the specific implementation manner is the same as that of embodiment 1, and the differences are that: the grading condition of the first aggregate is single grading.

Example 17

Embodiment 17 provides a but, building structure consolidates special type reinforced concrete of atress jointly, and embodiment 1 is the same, the difference lies in: the water reducing agent is an ether polycarboxylic acid water reducing agent.

Example 18

Embodiment 18 provides a special reinforced concrete that can bear force jointly for building structure reinforcement, and the difference between the specific implementation manner and embodiment 1 is: the water reducing agent is an ester polycarboxylate water reducing agent.

Example 19

Embodiment 19 provides a but special reinforced concrete of common atress for building structure reinforcement, and embodiment 1 is the same, the difference lies in: the weight ratio of the ether polycarboxylic acid water reducer to the ester polycarboxylic acid water reducer is 2.

Example 20

Embodiment 20 provides a but, building structure consolidates special reinforced concrete of atress jointly, and embodiment is the same as embodiment 1, and the difference lies in: the weight ratio of the ether polycarboxylic acid water reducer to the ester polycarboxylic acid water reducer is 1.

Comparative example 1

Comparative example 1 is a commercial grout.

The grouting material is purchased from H60 grouting material produced by Lihong building material business in Zhengdong new area of Zhengzhou city, a supplier.

Performance test method

1. Compressive strength

The prepared special reinforced concrete with common stress for reinforcing building structures is tested for the compressive strength according to GB 50010-2002, and the results are recorded in Table 1. The compressive strength growth curves of example 1 and comparative example 1 are shown in fig. 3.

2. Modulus of elasticity

The compressive strength of the prepared special reinforced concrete which can bear the common stress for reinforcing the building structure is tested for 7 days, 14 days and 28 days according to GB 50010-2002, and the results are recorded in Table 1.

3. Micro-expansion property

The micro-expansion performance of the prepared special reinforced concrete capable of being stressed together for reinforcing building structures is tested according to GB 23439-2009, and the results are recorded in Table 1.

4. Adhesive strength

The prepared special reinforced concrete which can bear the common force for reinforcing the building structure is tested for the bonding strength by a bonding strength detector, and the result is recorded in table 1.

5. Bleeding rate

The prepared special reinforced concrete which has the common stress for reinforcing the building structure is tested for the bleeding rate according to GB 8076-2008, and the result is recorded in the table 1.

6. Degree of expansion

The prepared special reinforced concrete with common stress for reinforcing the building structure is tested for the expansion degree by adopting an expansion degree tester, and the result is recorded in table 1.

7. Filling ratio of L-shaped instrument

The prepared special reinforced concrete with common stress for reinforcing the building structure adopts an L-shaped instrument to test the filling ratio of the L-shaped instrument, the specific calculation mode is shown in figure 2, and the result is recorded in table 1.

8. Difference between slump expansion and J-ring expansion

The prepared special reinforced concrete with common stress for reinforcing building structures is tested by adopting a schematic diagram of a calculation mode of difference between slump expansion and J-ring expansion shown in FIG. 1, and the result is recorded in Table 1.

TABLE 1

As can be seen from Table 1, except that the compressive strength and bleeding rate of the concrete prepared in example 2 are relatively poor due to the fact that the raw materials such as fly ash, shrinkage-compensating admixture and suspending agent are not added into the raw materials, the concrete prepared in examples 1 and 3 has higher cubic compressive strength and prismatic compressive strength, the 14d value in limited expansion rate water is more than or equal to 0.025%, the 28d value in 14 d-to-air water is more than or equal to-0.20%, and the bonding strength is more than or equal to 1.3MPa. The naphthalene water reducer used in example 4 has a large influence on the fluidity, workability and cubic compressive strength of concrete. The workability and compressive strength of examples 5-8 are slightly reduced compared to example 1, which may be due to the fact that the ultrafine particles prepared according to the proportion of the present application are compounded with a certain amount of silicon powder of 15000-30000 meshes and suspending agent, which is beneficial to improving the strength of concrete, and the flowing property, workability and strength of concrete are affected by the selection change of the components of the ultrafine particles or the change of the proportion of each component. The adhesive strength of examples 9-10 was low, probably because no bentonite and attapulgite were used simultaneously, and the synergistic effect therebetween was lacking, and the improvement of the adhesive effect was limited. From examples 11-13, it can be seen that when the shrinkage-compensating admixture used in example 1 is changed, the expansion-limiting water 14d value of the prepared concrete is reduced, which means that the use of UEA and HEA as shrinkage-compensating admixtures in the weight ratio of 1. It is evident from examples 14-16 that the concrete prepared from the concrete has a low strength, although it has a good adhesive strength and bleeding rate, probably because the size and grading degree of the first aggregate affects the grading effect with the second aggregate and the ultrafine particles, and the compactness, strength, workability and the like of the concrete, thereby affecting the strength of the concrete. From the examples 1 and 17 to 20, it can be seen that the selection and the proportion of the water reducing agent not only affect the bleeding rate, but also affect the strength of the concrete, and this is probably because the water reducing agent with the specific proportion of the water reducing agent helps to solve the problem of easy segregation and reduce the water sensitivity of on-site water addition, and the change of the composition of the water reducing agent affects the water reducing effect, so that the bleeding rate of the concrete is increased, and the strength is also affected. The grout of comparative example 1 was inferior in strength, restricted expansion rate and adhesive strength.

Claims

1. The special reinforced concrete capable of bearing force jointly for reinforcing the building structure is characterized by comprising the following components in parts by weight:

350-800 parts of cement,

400-900 parts of first aggregate,

500-900 parts of second aggregate,

0-100 parts of fly ash,

10-150 parts of mineral powder,

0.5-30 parts of ultrafine particles,

0.5 to 20 portions of attapulgite,

0.5 to 20 portions of bentonite,

0.5-40 parts of silicon powder,

0-60 parts of shrinkage-compensating admixture,

0.1 to 3 portions of water reducing agent,

0.3 to 3 portions of functional additive,

150-220 parts of water;

the superfine particles are superfine mineral powder, superfine cement and superfine coal ash; the weight ratio of the superfine mineral powder to the superfine cement to the superfine coal ash is (1-2): (1-2): (1-2); the particle diameter D50 of the superfine particles is less than or equal to 15 mu m, and the fineness is more than or equal to 700m ² /kg；

The compensation shrinkage admixture is UEA and HEA; the weight ratio of UEA to HEA is 1: (1-3);

the functional additive comprises 0-0.5 part of suspending agent, 0.1-1 part of adhesive, 0.1-1 part of air entraining agent and 0.1-1 part of defoaming agent;

the micro-expansion performance is shown as follows: the 14d value in the limited expansion rate water is more than or equal to 0.025 percent, and the 14d value in the water is more than or equal to-0.20 percent of the 28d value in air.

2. The commonly stressed specialty-reinforced concrete for reinforcing building structures according to claim 1, wherein said first and second aggregates have a particle size of 4.75-16mm, and wherein the absolute volume of the first aggregate per unit volume is 0.20-0.35m ³ 。

3. The commonly stressed special reinforced concrete for reinforcing the building structure according to claim 1, wherein the fineness of the attapulgite and the bentonite is 250-400 meshes, and the water content is less than or equal to 20%.

4. The commonly stressed special reinforced concrete for reinforcing building structures according to claim 1, wherein the fineness of the silicon powder is 15000-30000 meshes.

5. The commonly stressed special reinforced concrete for reinforcing building structures according to claim 1, wherein the water reducer is an ether lipid compound water reducer, specifically multiple of naphthalene concrete water reducers and polycarboxylic acid concrete water reducers.

6. The commonly stressed special reinforced concrete for reinforcing building structures according to claim 1, wherein the adhesive is one or more of epoxy resin and latex powder; the solid content of the adhesive is greater than or equal to 95%.

7. The commonly stressed special reinforced concrete for reinforcing building structures according to claim 1, wherein the fluidity and filling property are represented as follows: the expansion degree is more than or equal to 600 and less than or equal to 720, and the filling ratio of the L-shaped instrument is more than or equal to 0.9; workability and homogeneity are shown as follows: the bleeding rate is 0, and the volume weight is controlled to be 2160-2400kg/m ³ (ii) a The steel bar passing capability is shown as follows: the difference between the slump expansion and the J ring expansion is less than or equal to 25mm; the elastic modulus difference between the newly added structure and the original structure is less than or equal to 10 percent; the bonding strength is more than or equal to 1.2MPa.

8. The application of the special commonly stressed reinforced concrete for reinforcing the building structure according to any one of claims 1 to 7, particularly comprising the working conditions of enlarging the section, replacing the concrete and newly adding members of the existing building and structure; it is also suitable for concrete members with special requirements in new construction.