CN113620664B - Ultrahigh-performance concrete and preparation method thereof - Google Patents

Ultrahigh-performance concrete and preparation method thereof Download PDF

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CN113620664B
CN113620664B CN202110954756.XA CN202110954756A CN113620664B CN 113620664 B CN113620664 B CN 113620664B CN 202110954756 A CN202110954756 A CN 202110954756A CN 113620664 B CN113620664 B CN 113620664B
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phosphogypsum
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ultra
performance concrete
powder
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CN113620664A (en
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徐立斌
陈尚伟
何信周
廖昶
周灵
陈亦苏
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GUIZHOU ZHONGJIAN ARCHITECTURAL SCIENCE DESIGN INSTITUTE CO LTD
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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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention belongs to the technical field of building material preparation, and particularly relates to an ultra-high performance concrete and a preparation method thereof; the micro-expansion effect of the dihydrate phosphogypsum is utilized, the dihydrate phosphogypsum is subjected to surface modification treatment by stearic acid on the basis, so that the activation index of the dihydrate phosphogypsum is improved, the stearic acid can form an adsorption layer on the surface and can be fully and tightly combined with superfine mineral powder, the compactness and the strength of a UHPC matrix can be effectively improved after mixing, and the compressive strength of the UHPC matrix is improved on the basis of reducing the cement consumption; the silane coupling agent and the natural resin are adopted to carry out surface treatment on the fibers, so that the bonding degree of the fibers and the slurry is effectively increased, and the change degree of the compressive strength of the concrete after being corroded is small.

Description

Ultrahigh-performance concrete and preparation method thereof
Technical Field
The invention belongs to the technical field of building material preparation, and particularly relates to ultra-high performance concrete and a preparation method thereof.
Background
With the development and progress of building technology, various super high-rise buildings, novel bridges and large-span structures have increasingly demanded ultra high performance concrete. The ultra-high performance concrete (UHPC) is a cement-based composite material with ultra-high strength, high toughness and high durability, which is formed by adding water into cement, mineral admixture, fine aggregate, high-strength short fine fiber, water reducing agent and the like, mixing, and coagulating and hardening.
In the preparation process, in order to obtain compact and high-strength UHPC, a technical scheme of high cementing material, high water reducing agent and low water-to-gel ratio is mostly adopted, for example, a patent CN202010903732.7 discloses a method for preparing UHPC with more than 150 carbon atoms by adopting an ultrahigh-performance water reducing agent; for example, patent CN201310260592.6 discloses an ecological nanoparticle reinforced cement-based composite material and a preparation method thereof, wherein high-strength high-elasticity spherical nanoparticles in industrial waste residues are adopted to fill an ultrahigh-performance concrete matrix, and a high-performance admixture with a water reduction rate of more than 50% is used to prepare the ultrahigh-performance concrete with a compressive strength of 300 MPa. Although the method can prepare the ultra-high performance concrete, the problems of high viscosity, poor working flow property and the like of the UHPC mixture also exist, and the application requirement of the UHPC engineering can not be met; meanwhile, due to the fact that the viscosity of the UHPC is too high, fibers in the mixture cannot be effectively dispersed, and the problems of fiber performance waste, cost increase and the like are caused.
Therefore, the key of UHPC engineering application is how to reduce the viscosity of UHPC mixture and improve the work fluidity under the technical scheme of high cementing material, high water reducing agent and low water-to-gel ratio.
Disclosure of Invention
The invention provides ultra-high performance concrete and a preparation method thereof to solve the problems.
The method is realized by the following technical scheme:
1. the ultrahigh performance concrete consists of cement 650-750 weight portions, silica powder 150-210 weight portions, support powder 190-280 weight portions, sand 420-560 weight portions, admixture 30-60 weight portions, reinforcing material 150-230 weight portions and water 120-150 weight portions.
Furthermore, the support powder comprises 150-210 parts of superfine mineral powder and 40-70 parts of modified dihydrate phosphogypsum by weight.
Furthermore, the specific surface area of the superfine mineral powder is more than 950 square meters per kg.
Furthermore, the reinforcing material is obtained by soaking the fibers with sufficient surface treating agent and then drying.
Furthermore, the modified dihydrate phosphogypsum is obtained by washing and aging phosphogypsum and then treating the phosphogypsum with a surface modification liquid, wherein the pH value of the modification is controlled to be 7-8.
Further, the surface modification liquid is stearic acid with 2% of phosphogypsum mass fraction, and is dissolved by methanol.
Further, the preparation method of the modified dihydrate phosphogypsum comprises the following steps: washing phosphogypsum with water for 2-4 times, aging for 24-40h, adding surface modification treatment solution at 55-65 deg.C, stirring for 15-25min, oven drying at 60 deg.C, and grinding to fineness of 300 mesh.
Furthermore, the content of the calcium sulfate dihydrate of the phosphogypsum is more than 95 percent, and the maximum grain diameter is less than 0.08mm.
Furthermore, the support powder is obtained by directly mixing the modified dihydrate phosphogypsum and the superfine mineral powder.
Further, the fiber is steel fiber or carbon fiber; the surface treating agent is prepared by mixing silane coupling agent and natural resin in a weight ratio of 1-7:3-10 by mass ratio.
Further, the additive is one or more of a water reducing agent, a thickening agent and a thixotropic agent; the silicon powder SiO 2 The content is more than 95 percent; the cement is PO.42.5 or PO.52.5; the maximum grain size of the sand is not more than 0.5mm.
2. The preparation method of the ultra-high performance concrete comprises the following steps:
(1) Uniformly mixing cement, silicon powder and sand in a stirrer, wherein the stirring speed is 120-200r/min, and the stirring time is 3-5min;
(2) Adding water and an additive on the basis of the step (1), and stirring at the speed of 1500-2000r/min for 5-8min to obtain ultra-high performance concrete slurry;
(3) And (3) adding supporting powder and a reinforcing material on the basis of the step (2), and stirring at the speed of 1500-2000r/min for 3-5min to obtain the ultra-high performance concrete.
In conclusion, the beneficial effects of the invention are as follows: according to the invention, the micro-expansion effect of the dihydrate phosphogypsum is utilized, and stearic acid is adopted to carry out surface modification treatment on the dihydrate phosphogypsum on the basis, so that the activation index of the dihydrate phosphogypsum is improved, the stearic acid can form an adsorption layer on the surface and can be fully and tightly combined with superfine mineral powder, the compactness and the strength of a UHPC matrix can be effectively improved after mixing, and the compressive strength of the UHPC is improved on the basis of reducing the cement consumption; the silane coupling agent and the natural resin are adopted to carry out surface treatment on the fibers, so that the bonding degree of the fibers and the slurry is effectively increased, and the change degree of the compressive strength of the concrete after being corroded is small.
Compared with the prior art, the UHPC prepared by the method has excellent strength, and the mixture has lower viscosity and higher working fluidity. The superfine mineral powder is a high-quality concrete admixture, can effectively reduce the using amount of cement, improve the compactness and the fluidity of UHPC, reduce the cost, and can effectively improve the strength of concrete by combining the superfine mineral powder with the modified phosphogypsum dihydrate. Furthermore, the ultra-high speed graded stirring method is adopted in the UHPC processing preparation process, the phenomena of molecular adsorption and agglomeration of the ultra-fine powder are thoroughly interrupted, the UHPC slurry material is uniformly dispersed, the performance of the material is fully exerted, the viscosity of the mixture is reduced, and the working fluidity and the strength of the UHPC are improved. The production process is simple and feasible, is convenient to operate, is easy to popularize and implement industrial production, and has wide application prospect.
Detailed Description
The following is a detailed description of the embodiments of the present invention, but the present invention is not limited to these embodiments, and any modifications or substitutions in the basic spirit of the embodiments are included in the scope of the present invention as claimed in the claims.
Example 1
1. The ultrahigh-performance concrete comprises, by weight, 700 parts of cement, 180 parts of silica powder, 220 parts of support powder, 490 parts of sand, 45 parts of an additive, 200 parts of a reinforcing material and 135 parts of water.
Further, the support powder comprises 165 parts of superfine mineral powder and 55 parts of modified dihydrate phosphogypsum in parts by weight.
Furthermore, the specific surface area of the superfine mineral powder is more than 950 square meters per kg.
Furthermore, the reinforcing material is obtained by soaking the fibers with sufficient surface treating agent and then drying.
Furthermore, the modified dihydrate phosphogypsum is obtained by washing and aging phosphogypsum and then treating the phosphogypsum with a surface modification liquid, wherein the modified pH value is 7.
Further, the surface modification liquid is stearic acid with the phosphogypsum mass fraction of 2%, and is dissolved by methanol.
Further, the preparation method of the modified dihydrate phosphogypsum comprises the following steps: washing phosphogypsum with water for 3 times, aging for 35h, adding surface modification treatment solution at 60 deg.C, stirring for 20min, oven drying at 60 deg.C, and grinding to fineness of 300 mesh.
Furthermore, the content of the calcium sulfate dihydrate of the phosphogypsum is 97 percent, and the maximum grain diameter is 0.07mm.
Furthermore, the support powder is obtained by directly mixing the modified dihydrate phosphogypsum and the superfine mineral powder.
Further, the fiber is steel fiber; the surface treating agent is prepared by mixing a silane coupling agent and natural resin in a ratio of (5: 6 in mass ratio.
Further, the additive is a water reducing agent, in particular a polycarboxylic acid high-efficiency water reducing agent; the silicon powder SiO 2 The content is 96%; the cement is PO.42.5; the maximum grain size of the sand is 0.5mm.
2. The preparation method of the ultra-high performance concrete comprises the following steps:
(1) Uniformly mixing cement, silicon powder and sand in a stirrer, wherein the stirring speed is 160r/min, and the stirring time is 4min;
(2) Adding water and an additive on the basis of the step (1), and stirring at the speed of 1700r/min for 7min to obtain ultra-high performance concrete slurry;
(3) And (3) adding supporting powder and a reinforcing material on the basis of the step (2), and stirring at the speed of 1700r/min for 4min to obtain the ultra-high performance concrete.
Example 2
1. The ultrahigh-performance concrete comprises, by weight, 650 parts of cement, 150 parts of silica powder, 190 parts of support powder, 420 parts of sand, 30 parts of an additive, 150 parts of a reinforcing material and 120 parts of water.
Furthermore, the support powder comprises 150 parts by weight of superfine mineral powder and 40 parts by weight of modified dihydrate phosphogypsum.
Furthermore, the specific surface area of the superfine mineral powder is more than 950 square meters per kg.
Furthermore, the reinforcing material is obtained by soaking the fibers with sufficient surface treating agent and then drying.
Furthermore, the modified dihydrate phosphogypsum is obtained by washing and aging phosphogypsum and then treating the phosphogypsum with a surface modification liquid, wherein the modified pH value is 8.
Further, the surface modification liquid is stearic acid with 2% of phosphogypsum mass fraction, and is dissolved by methanol.
Further, the preparation method of the modified dihydrate phosphogypsum comprises the following steps: washing phosphogypsum with water for 2 times, aging for 40h, adding the surface modification treatment liquid at 65 ℃, stirring for 15min, drying at 60 ℃, and grinding to 300 meshes.
Furthermore, the content of the calcium sulfate dihydrate of the phosphogypsum is 95 percent, and the maximum grain diameter is 0.08mm.
Furthermore, the support powder is obtained by directly mixing the modified dihydrate phosphogypsum and the superfine mineral powder.
Further, the fibers are carbon fibers; the surface treating agent is prepared by mixing a silane coupling agent and natural resin in a ratio of 1:3 in mass ratio.
Further, the additive is a thickening agent; the silicon powder SiO 2 The content is 95 percent; the cement is PO.52.5; the maximum grain size of the sand is 0.4mm.
2. The preparation method of the ultra-high performance concrete comprises the following steps:
(1) Uniformly mixing cement, silicon powder and sand in a stirrer, wherein the stirring speed is 120r/min, and the stirring time is 5min;
(2) Adding water and an additive on the basis of the step (1), and stirring at the speed of 1500r/min for 8min to obtain ultra-high performance concrete slurry;
(3) And (3) adding support powder and a reinforcing material on the basis of the step (2), and stirring at the speed of 1500r/min for 5min to obtain the ultra-high performance concrete.
Example 3
1. The composition of the ultra-high performance concrete comprises, by weight, 750 parts of cement, 210 parts of silica powder, 260 parts of support powder, 560 parts of sand, 60 parts of an additive, 230 parts of a reinforcing material and 150 parts of water.
Furthermore, the support powder comprises 190 parts of superfine mineral powder and 70 parts of modified dihydrate phosphogypsum by weight.
Further, the specific surface area of the superfine mineral powder is more than 950 square meters per kg.
Furthermore, the reinforcing material is obtained by soaking the fibers with sufficient surface treating agent and then drying.
Furthermore, the modified dihydrate phosphogypsum is obtained by washing and aging phosphogypsum and then treating the phosphogypsum with a surface modification liquid, wherein the modified pH value is 8.
Further, the surface modification liquid is stearic acid with 2% of phosphogypsum mass fraction, and is dissolved by methanol.
Further, the preparation method of the modified dihydrate phosphogypsum comprises the following steps: washing phosphogypsum with water for 4 times, aging for 24h, adding the surface modification treatment solution at 55 deg.C, stirring for 25min, oven drying at 60 deg.C, and grinding to fineness of 300 mesh.
Furthermore, the content of the calcium sulfate dihydrate of the phosphogypsum is 96%, and the maximum particle size is 0.08mm.
Furthermore, the support powder is obtained by directly mixing the modified dihydrate phosphogypsum and the superfine mineral powder.
Further, the fiber is steel fiber; the surface treating agent is prepared from a silane coupling agent and natural resin in a weight ratio of 7:10 by mass ratio.
Further, the additive is a thixotropic agent; the silicon powder SiO 2 The content is 97%; the cement is PO.42.5; the maximum grain size of the sand is 0.3mm.
2. The preparation method of the ultra-high performance concrete comprises the following steps:
(1) Uniformly mixing cement, silicon powder and sand in a stirrer, wherein the stirring speed is 200r/min, and the stirring time is 3min;
(2) Adding water and an additive on the basis of the step (1), and stirring at the speed of 2000r/min for 5min to obtain ultra-high performance concrete slurry;
(3) And (3) adding supporting powder and a reinforcing material on the basis of the step (2), and stirring at the speed of 2000r/min for 3min to obtain the ultra-high performance concrete.
Comparative example 1
UHPC was prepared using the formulation and preparation method of example 1, with the difference that phosphogypsum was not washed and aged.
Comparative example 2
UHPC was prepared using the formulation and preparation method of example 1, with the difference that the aged phosphogypsum was not soaked with a surface modification solution.
Comparative example 3
UHPC was prepared using the formulation and preparation method of example 1, except that the surface modification solution was changed to an equal amount of methanol.
Comparative example 4
UHPC was prepared using the formulation and preparation method of example 1, except that the fibers were not surface treated.
Comparative example 5
UHPC was prepared using the formulation and preparation method of example 3, except that the silane coupling agent in the surface treatment agent was removed and the fiber was treated with only natural resin.
Comparative example 6
UHPC was prepared using the formulation and preparation method of example 3, except that the natural resin in the surface treatment agent was removed and the fiber was treated with only the silane coupling agent.
Comparative example 7
UHPC was prepared using the formulation and preparation method of example 1 except that the rotational speed of step (2) and step (3) in the preparation method was changed to 500r/min.
1. Concrete Performance testing
1. Concrete test pieces were prepared by the methods of examples 1 to 3 and comparative examples 1 to 7, and the compressive strength and the flexural strength of the test pieces were respectively measured according to GB/T50081 Standard for testing mechanical Properties of ordinary concrete, and the results are shown in Table 1.
TABLE 1
Figure BDA0003219817960000071
Figure BDA0003219817960000081
According to test results, the compressive strength and the breaking strength of the UHPC can be effectively improved by carrying out surface improvement treatment on the washed and aged phosphogypsum.
2. Fluidity of the ultra-high performance concrete slurry in examples 1 to 3 and comparative example 7 was measured according to JC/T986-2018 Cement-based grouting materials, and the results are shown in Table 2.
TABLE 2
Figure BDA0003219817960000082
The ultra high speed was used in the preparation process, and it was found from the test results that the stirring rate was low, the viscosity was high, the fluidity was low, the loss of fluidity in comparative example 7 with time was large at 60min, and the loss of fluidity in examples 1 to 3 with time was minimal, which indicates that the UHPC slurry prepared in comparative example 7 had a high viscosity.
3. The concrete samples prepared in example 1 and comparative examples 4-6 are completely soaked in sulfuric acid solution for 30 days by adopting a full soaking method, and after soaking is finished, a compressive strength test is carried out according to GB/T50081 standard of common concrete mechanical property test method; the results are shown in Table 3.
TABLE 3
Figure BDA0003219817960000091
The test results show that the compressive strength of UHPC after corrosion can be effectively enhanced after the fiber is subjected to surface treatment, and the service life is effectively prolonged.
2. Influence of ultra-fine mineral powder on UHPC viscosity
Comparative example 8: the UHPC is prepared by the formula and the preparation method of the example 1, and the difference is that the superfine mineral powder with the specific surface area of 850 square meters per kg is selected.
Comparative example 9: UHPC is prepared by the formulation and preparation method of example 1, except that ordinary mineral powder is used instead of ultra-fine mineral powder.
The fluidity of the ultra-high performance concrete slurry in comparative example 8 and comparative example 9 was measured according to JC/T986-2018 Cement-based grouting materials, and the results are shown in Table 4.
TABLE 4
Figure BDA0003219817960000092
Figure BDA0003219817960000101
From the test results, it is understood that the specific surface area and the particle size of the ore powder have a certain influence on the viscosity of UHPC, and it was found in the preparation process of comparative example 9 that the amount of cement used is increased to 720 parts when ordinary ore powder is used. The superfine mineral powder can effectively reduce the using amount of cement and improve the compactness and the fluidity of UHPC.

Claims (5)

1. The ultra-high performance concrete comprises the following components in parts by weight: 650-750 parts of cement, 150-210 parts of silica powder, 190-280 parts of support powder, 420-560 parts of sand, 30-60 parts of an additive, 150-230 parts of a reinforcing material and 120-150 parts of water; the support powder is characterized by comprising 150-210 parts of superfine mineral powder and 40-70 parts of modified dihydrate phosphogypsum in parts by weight; the specific surface area of the superfine mineral powder is more than 950 square meters per kg; the reinforcing material is obtained by soaking and drying fibers with enough surface treating agent;
the modified dihydrate phosphogypsum is obtained by washing and aging phosphogypsum and then treating the phosphogypsum with a surface modification liquid, wherein the pH value of the modification is controlled to be 7-8;
the content of calcium sulfate dihydrate of the phosphogypsum is more than 95 percent, and the maximum particle size is less than 0.08 mm;
the surface modification liquid is stearic acid with 2 percent of phosphogypsum mass fraction, and is dissolved by methanol;
the fiber is steel fiber or carbon fiber; the surface treating agent is prepared by mixing silane coupling agent and natural resin in a weight ratio of 1-7:3-10 by mass ratio.
2. The ultra-high performance concrete of claim 1, wherein the modified dihydrate phosphogypsum is prepared by the following steps: washing phosphogypsum with water for 2-4 times, aging for 24-40h, adding surface modification treatment solution at 55-65 deg.C, stirring for 15-25min, oven drying at 60 deg.C, and grinding to fineness of 300 mesh.
3. The ultra-high performance concrete of claim 1, wherein said support powder is obtained by directly mixing modified dihydrate phosphogypsum with ultra-fine mineral powder.
4. The ultra-high performance concrete of claim 1, wherein the admixture is one or more of a water reducing agent, a thickening agent and a thixotropic agent; the SiO2 content of the silicon powder is more than 95 percent; the cement is PO 42.5 or PO 52.5; the maximum grain size of the sand is not more than 0.5mm.
5. The method for preparing an ultra high performance concrete according to any one of claims 1 to 4, comprising the steps of:
(1) Uniformly mixing cement, silicon powder and sand in a stirrer, wherein the stirring speed is 120-200r/min, and the stirring time is 3-5min;
(2) Adding water and an additive on the basis of the step (1), and stirring at the speed of 1500-2000r/min for 5-8min to obtain ultra-high performance concrete slurry;
(3) And (3) adding support powder and a reinforcing material on the basis of the step (2), and stirring at the speed of 1500-2000r/min for 3-5min to obtain the ultra-high performance concrete.
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