CN115417650A - Low-shrinkage low-hydration-heat ultrahigh-performance concrete and preparation method thereof - Google Patents

Low-shrinkage low-hydration-heat ultrahigh-performance concrete and preparation method thereof Download PDF

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Publication number
CN115417650A
CN115417650A CN202210713150.1A CN202210713150A CN115417650A CN 115417650 A CN115417650 A CN 115417650A CN 202210713150 A CN202210713150 A CN 202210713150A CN 115417650 A CN115417650 A CN 115417650A
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percent
low
shrinkage
performance concrete
absorbent resin
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明阳
李玲
陈平
向玮衡
胡成
李青
甘国兴
潘格林
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Guilin University of Technology
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Guilin Xinnan Technology Co ltd
Guilin University of Technology
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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
    • C04B28/10—Lime cements or magnesium oxide 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/08—Flue dust, i.e. fly ash
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/14—Waste materials; Refuse from metallurgical processes
    • C04B18/141—Slags
    • C04B18/142—Steelmaking slags, converter slags
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/14—Waste materials; Refuse from metallurgical processes
    • C04B18/146—Silica fume
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/08—Acids or salts thereof
    • C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
    • C04B22/142—Sulfates
    • C04B22/148—Aluminium-sulfate
    • 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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/12—Nitrogen containing compounds organic derivatives of hydrazine
    • C04B24/124—Amides
    • 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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24—Macromolecular compounds
    • C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B24/2641—Polyacrylates; Polymethacrylates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/34—Non-shrinking or non-cracking materials
    • C04B2111/343—Crack resistant materials
    • 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
    • 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)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Civil Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention discloses a low-shrinkage low-hydration-heat ultrahigh-performance concrete and a preparation method thereof, wherein the concrete comprises the following components in percentage by mass: 20 to 25 percent of cement, 4 to 5 percent of silica fume, 8 to 10 percent of steel slag powder, 8 to 10 percent of fly ash, 0.6 to 0.8 percent of calcium oxide, 1.4 to 1.6 percent of expanding agent, 0.01 to 0.02 percent of super absorbent resin, 0.005 to 0.01 percent of shrinkage inhibitor, 43 to 47 percent of quartz sand, 0.28 to 0.32 percent of water reducing agent, 0.005 to 0.008 percent of defoaming agent and 6 to 8 percent of steel fiber. The low-shrinkage low-hydration-heat ultrahigh-performance concrete has ultrahigh mechanical property and durability, has the characteristics of low hydration heat and low shrinkage, can be used for a large-volume concrete structure part which is easy to crack, and can inhibit the formation of temperature stress cracks and shrinkage cracks.

Description

Low-shrinkage low-hydration-heat ultrahigh-performance concrete and preparation method thereof
Technical Field
The invention relates to the technical field of ultra-high performance concrete, in particular to low-shrinkage low-hydration-heat ultra-high performance concrete and a preparation method thereof.
Background
The high performance of concrete is one of the main development trends of modern concrete technology. In recent years, with the development of high-efficiency water reducing agent and ultra-fine mineral admixture technology, 100-150 MPa of ultra-high performance concrete (UHPC) can be prepared by adopting conventional materials and common processes. Because UHPC has ultrahigh strength, ultrahigh toughness, ultralow abrasion coefficient and high environmental protection, UHPC is gradually replacing common concrete to be applied to some practical projects, and at present, UHPC is already applied to structures with thinner structure sizes, such as steel bridge deck pavement, prefabricated parts and the like.
However, for some large-volume concrete structures requiring ultra-high performance, the high hydration heat and large shrinkage caused by the large amount of cement used in the UHPC preparation process limit the application of the UHPC in similar projects. If the special admixture, the large-dosage ultrafine mineral admixture and the composite expanding agent are used for preparing the low-shrinkage low-hydration-heat ultrahigh-performance concrete with a large-volume structure, the application field of the ultrahigh-performance concrete is inevitably greatly expanded.
Disclosure of Invention
The invention aims to provide low-shrinkage low-hydration-heat ultrahigh-performance concrete and a preparation method thereof.
In order to achieve the purpose, the invention provides low-shrinkage low-hydration-heat ultrahigh-performance concrete which comprises the following components in percentage by mass: 20 to 25 percent of cement, 4 to 5 percent of silica fume, 8 to 10 percent of steel slag powder, 8 to 10 percent of fly ash, 0.6 to 0.8 percent of calcium oxide, 1.4 to 1.6 percent of expanding agent, 0.01 to 0.02 percent of super absorbent resin, 0.005 to 0.01 percent of shrinkage inhibitor, 43 to 47 percent of quartz sand, 0.28 to 0.32 percent of water reducing agent, 0.005 to 0.008 percent of defoaming agent and 6 to 8 percent of steel fiber.
As a preferred embodiment, the low-shrinkage low-hydration-heat ultrahigh-performance concrete consists of the following components in percentage by mass: 20 to 24 percent of cement, 4 to 4.5 percent of silica fume, 9 to 9.735 percent of steel slag powder, 8.652 to 9 percent of fly ash, 0.7 to 0.75 percent of calcium oxide, 1.45 to 1.5 percent of expanding agent, 0.01 to 0.02 percent of super absorbent resin, 0.005 to 0.008 percent of shrinkage inhibitor, 44.579 to 46 percent of quartz sand, 0.28 to 0.3 percent of water reducing agent, 0.005 to 0.006 percent of defoaming agent and 6.5 to 7 percent of steel fiber.
As a preferred embodiment, the low-shrinkage low-hydration heat ultra-high-performance concrete consists of the following components in percentage by mass: 22% of cement, 4.5% of silica fume, 9% of steel slag powder, 9% of fly ash, 0.7% of calcium oxide, 1.5% of expanding agent, 0.01% of super absorbent resin, 0.005% of shrinkage inhibitor, 46% of quartz sand, 0.28% of water reducing agent, 0.005% of defoaming agent and 7% of steel fiber.
As a preferred embodiment, the cement is ordinary portland cement, and the strength grade is more than or equal to 42.5 grade; siO in the silica fume 2 The mass content of the nano-particles is more than or equal to 95 percent, and the average particle size is 0.16-0.19 mu m; the average grain diameter of the fly ash is 5-15 mu m.
As a preferred embodiment, the calcium oxide isThe limestone is prepared by calcining and then grinding, and the specific surface area of the calcium oxide is 480-500 m 2 (iv) kg; the expanding agent is an ettringite type expanding agent, and the specific surface area is 460-480 m 2 /kg。
In a preferred embodiment, the super absorbent resin is polyacrylamide absorbent resin with the fineness of 200-400 meshes; the shrinkage inhibitor is amide organic powder; siO in the quartz sand 2 The mass content of the powder is not less than 98 percent, and the fineness is 20 to 200 meshes.
As a preferred embodiment, the polyacrylamide-based water absorbent resin is prepared by the steps of: respectively weighing 0.4Kg, 1Kg and 1Kg of sodium p-toluenesulfonate, acrylic acid and acrylamide, adding the sodium p-toluenesulfonate, the acrylic acid and the acrylamide into 2.5L of deionized water for dissolving, and then dropwise adding sodium hydroxide to control the pH value to be alkalescent; then adding 1.5Kg of N, N' -methylene bisacrylamide and 0.05Kg of potassium persulfate, and reacting for 2h at the water bath temperature of 60 ℃; and (3) after the reaction is finished, washing the product by using absolute ethyl alcohol, drying at 70 ℃, and grinding into powder to obtain the polyacrylamide water-absorbent resin.
In a preferred embodiment, the amide-based organic compound is diazene dicarboxylic acid amide.
The inventor researches and discovers that the commercially available polyacrylamide water-absorbent resin is generally prepared by an aqueous solution polymerization method under the condition of an initiator by using acrylamide as a monomer and N, N' -methylene-bisacrylamide as a crosslinking agent, and has good high water absorption property, but the water absorption rate is low, and several hours are required for reaching a water absorption saturation state. Based on the defects, the applicant adopts acrylic acid and acrylamide as monomers in the same proportion, adopts sodium p-toluenesulfonate as a modified grafting substance, utilizes the high steric resistance of the monomers, improves the reticular space structure in the resin, and can effectively improve the water absorption rate; and the sulfonic acid group has strong hydrophilicity, and the water absorption capacity of the polyacrylamide water-absorbent resin is further improved.
Preferably, the water reducing agent is a polycarboxylic acid type high-efficiency water reducing agent, and the water reducing rate is more than or equal to 30 percent; the defoaming agent is an organic silicon defoaming agent.
In a preferred embodiment, the steel fiber is copper-plated steel fiber, the diameter is 0.18-0.23 mm, the length is 12-14 mm, and the tensile strength is not less than 2850MPa.
The invention also provides a preparation method of the low-shrinkage low-hydration-heat ultrahigh-performance concrete, which comprises the following steps:
1) Weighing 20-25% of cement, 4-5% of silica fume, 8-10% of steel slag powder, 8-10% of fly ash, 0.6-0.8% of calcium oxide, 1.4-1.6% of expanding agent, 0.01-0.02% of super absorbent resin, 0.005-0.01% of shrinkage inhibitor, 43-47% of quartz sand, 0.27-0.32% of water reducing agent, 0.005-0.008% of defoaming agent and 6-8% of steel fiber for later use according to the mass percentage;
2) Adding the quartz sand and the steel fiber weighed in the step 1) into a dry mixer for dry mixing for 5-10 min;
3) Adding the cement, the silica fume, the steel slag powder, the fly ash, the calcium oxide and the expanding agent weighed in the step 1) into a dry mixer and continuously performing dry mixing for 5-10 min;
4) Adding the super absorbent resin, the shrinkage inhibitor, the water reducer and the defoaming agent weighed in the step 1) into a dry mixer, and continuously performing dry mixing for 10-15 min to obtain the low-shrinkage low-hydration-heat super high-performance concrete.
In a preferred embodiment, the rotation speed of the dry mixer is 160 to 200r/min.
Compared with the prior art, the invention has the following advantages:
firstly, the invention utilizes the large-doping-amount silica fume, the steel slag powder and the fly ash as the admixtures, the doping amounts are respectively 4-5%, 8-10% and 8-10%, the dosage of the cement in the components is obviously reduced, the hydration heat of the ultra-high performance concrete can be greatly reduced, and simultaneously, the close packing principle is utilized, the proportion in the components is reasonably allocated, so that the whole system reaches the closest packing state, and the ultra-high mechanical performance is obtained.
Secondly, the super-absorbent resin can carry out internal curing on the super-high performance concrete by utilizing the characteristics of early stage water absorption and later stage water release of the super-high water-absorbent resin, so that the plastic stage shrinkage is obviously inhibited; the shrinkage inhibitor of the amide organic powder can be decomposed in an alkaline environment generated by cement hydration to generate nitrogen, so that a micro-expansion effect is achieved, and the ultra-high performance concrete can achieve no shrinkage or micro-expansion effect in a plasticity stage; the calcium oxide and the ettringite type expanding agent are compounded, so that uniform expansion effect can be generated after the ultra-high performance concrete is hardened, and the ultra-high performance concrete is free of shrinkage or micro-expansion in the later period.
Thirdly, the ultra-high performance concrete prepared by the invention has ultra-high mechanical property and durability, has the characteristics of low hydration heat and low shrinkage, can be used for a large-volume concrete structure part which is easy to crack, and can inhibit the formation of temperature stress cracks and shrinkage cracks.
Fourthly, the preparation process is simple, only a dry mixer is needed for mixing according to requirements, the raw materials are wide in source, and the preparation cost is low.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
The polyacrylamide water-absorbent resin A is prepared by the following steps: respectively weighing 0.4Kg, 1Kg and 1Kg of sodium p-toluenesulfonate, acrylic acid and acrylamide, adding the sodium p-toluenesulfonate, the acrylic acid and the acrylamide into 2.5L of deionized water for dissolving, and then dropwise adding sodium hydroxide to control the pH value to be alkalescent; then adding 1.5Kg of N, N' -methylene bisacrylamide and 0.05Kg of potassium persulfate, and reacting for 2h at the water bath temperature of 60 ℃; and after the reaction is finished, washing the product by absolute ethyl alcohol, drying at 70 ℃, and grinding into powder to obtain the polyacrylamide water-absorbent resin A.
The polyacrylamide type water-absorbent resin B is prepared by the following steps: weighing 1Kg and 1Kg of p-acrylic acid and acrylamide respectively, adding the acrylic acid and the acrylamide into 2.5L of deionized water for dissolving, and then dropwise adding sodium hydroxide to control the pH value to be alkalescent; then adding 1.5Kg of N, N' -methylene bisacrylamide and 0.05Kg of potassium persulfate, and reacting for 2h at the water bath temperature of 60 ℃; and (3) after the reaction is finished, washing the product by absolute ethyl alcohol, drying at 70 ℃, and grinding into powder to obtain the polyacrylamide water-absorbent resin B. The water absorption rate and water absorption rate of the polyacrylamide water-absorbent resin A and the polyacrylamide water-absorbent resin B were measured, and the results are shown in Table 1.
TABLE 1
Figure BDA0003707699470000041
According to the comparison, the polyacrylamide water-absorbent resin A adopted by the application has excellent water absorption rate, and the water absorption saturation time is obviously shortened; compared with the condition that the reactant does not adopt sodium p-toluenesulfonate, the water absorption multiplying power is improved by 46 percent, and the water absorption saturation time is shortened by 2.4 times. Therefore, the water absorption performance can be improved by modifying the polyacrylamide water-absorbing resin with the sodium p-toluenesulfonate. In the following examples, the polyacrylamide-based water-absorbent resin a is used as an illustration.
Example 1
The preparation method of the low-shrinkage low-hydration-heat ultrahigh-performance concrete provided by the embodiment comprises the following steps:
1) The proportion of raw materials is as follows: weighing 22% of cement, 4.5% of silica fume, 9% of steel slag powder, 9% of fly ash, 0.7% of calcium oxide, 1.5% of an expanding agent, 0.01% of super water-absorbent resin, 0.005% of a shrinkage inhibitor, 46% of quartz sand, 0.28% of a water reducing agent, 0.005% of a defoaming agent and 7% of steel fiber by mass percent, and accurately weighing the components.
2) Adding the quartz sand and the steel fiber weighed in the step 1) into a dry mixer for dry mixing for 5min;
3) Adding the cement, the silica fume, the steel slag powder, the fly ash, the calcium oxide and the expanding agent weighed in the step 1) into a dry mixer to continuously dry-mix for 5min;
4) Adding the super absorbent resin, the shrinkage inhibitor, the water reducer and the defoaming agent weighed in the step 1) into a dry mixer to continuously dry-mix for 10min to obtain the low-shrinkage low-hydration-heat super-high-performance concrete dry powder material.
Wherein the cement is ordinary portland cement, and the strength grade is more than or equal to 42.5 grade; siO in the silica fume 2 The mass content of the nano-particles is more than or equal to 95 percent, and the average particle size is 0.16-0.19 mu m; the average grain diameter of the fly ash is 5-15 mu m.
The calcium oxide is formed by calcining limestone and then grinding, and the specific surface area of the calcium oxide is 480-500 m 2 Per kg; the expanding agent is an ettringite type expanding agent, and the specific surface area is 460-480 m 2 /kg。
The super absorbent resin is polyacrylamide absorbent resin with the fineness of 200-400 meshes; the shrinkage inhibitor is diazene dicarboxylic acid amide powder; siO in the quartz sand 2 The mass content of the powder is not less than 98 percent, and the fineness is 20 to 200 meshes.
The water reducing agent is a polycarboxylic acid type high-efficiency water reducing agent, and the water reducing rate is more than or equal to 30 percent; the defoaming agent is an organic silicon defoaming agent.
The steel fiber is copper-plated steel fiber, the diameter is 0.18-0.23 mm, the length is 12-14 mm, and the tensile strength is more than or equal to 2850MPa.
Example 2
The preparation method of the low-shrinkage low-hydration-heat ultrahigh-performance concrete provided by the embodiment comprises the following steps:
1) The proportion of raw materials is as follows: weighing 20% of cement, 4.5% of silica fume, 10% of steel slag powder, 10% of fly ash, 0.7% of calcium oxide, 1.5% of an expanding agent, 0.01% of super-absorbent resin, 0.005% of a shrinkage inhibitor, 46% of quartz sand, 0.28% of a water reducing agent, 0.005% of a defoaming agent and 7% of steel fibers according to the mass percentage, and accurately weighing the components;
2) Adding the quartz sand and the steel fiber weighed in the step 1) into a dry mixer for dry mixing for 5min;
3) Adding the cement, the silica fume, the steel slag powder, the fly ash, the calcium oxide and the expanding agent weighed in the step 1) into a dry mixer and continuously performing dry mixing for 5min;
4) Adding the super absorbent resin, the shrinkage inhibitor, the water reducer and the defoaming agent weighed in the step 1) into a dry mixer to continuously dry-mix for 10min to obtain the low-shrinkage low-hydration-heat super-high-performance concrete dry powder material.
Wherein the cement is ordinary portland cement, and the strength grade is more than or equal to 42.5 grade; siO in the silica fume 2 The mass content of the nano-particles is more than or equal to 95 percent, and the average particle size is 0.16-0.19 mu m; the average grain diameter of the fly ash is 5-15 mu m.
The calcium oxide is formed by calcining limestone and then grinding, and the specific surface area of the calcium oxide is 480-500 m 2 Per kg; the expanding agent is an ettringite type expanding agent, and the specific surface area is 460-480 m 2 /kg。
The super absorbent resin is polyacrylamide absorbent resin with the fineness of 200-400 meshes; the shrinkage inhibitor is diazene dicarboxylic acid amide powder; siO in the quartz sand 2 The mass content of the powder is not less than 98 percent, and the fineness is 20 to 200 meshes.
The water reducing agent is a polycarboxylic acid type high-efficiency water reducing agent, and the water reducing rate is more than or equal to 30%; the defoaming agent is an organic silicon defoaming agent.
The steel fiber is copper-plated steel fiber, the diameter is 0.18-0.23 mm, the length is 12-14 mm, and the tensile strength is more than or equal to 2850MPa.
Example 3
The preparation method of the low-shrinkage low-hydration-heat ultrahigh-performance concrete provided by the embodiment comprises the following steps:
1) The proportion of raw materials is as follows: weighing 22% of cement, 4.5% of silica fume, 9% of steel slag powder, 9% of fly ash, 0.8% of calcium oxide, 1.6% of an expanding agent, 0.02% of super absorbent resin, 0.01% of a shrinkage inhibitor, 45.785% of quartz sand, 0.28% of a water reducing agent, 0.005% of a defoaming agent and 7% of steel fiber by mass percent, and accurately weighing the components;
2) Adding the quartz sand and the steel fiber weighed in the step 1) into a dry mixer for dry mixing for 5min;
3) Adding the cement, the silica fume, the steel slag powder, the fly ash, the calcium oxide and the expanding agent weighed in the step 1) into a dry mixer and continuously performing dry mixing for 5min;
4) Adding the super absorbent resin, the shrinkage inhibitor, the water reducer and the defoaming agent weighed in the step 1) into a dry mixer to continuously dry-mix for 10min to obtain the low-shrinkage low-hydration-heat super-high-performance concrete dry powder material.
Wherein the cement is ordinary portland cement, and the strength grade is more than or equal to 42.5 grade; siO in the silica fume 2 The mass content of the nano-particles is more than or equal to 95 percent, and the average particle size is 0.16-0.19 mu m; the average grain diameter of the fly ash is 5-15 mu m.
The calcium oxide is formed by calcining limestone and then grinding, and the specific surface area of the calcium oxide is 480-500 m 2 Per kg; the expanding agent is an ettringite expanding agent, and the specific surface area of the expanding agent is 460-480 m 2 /kg。
The super absorbent resin is polyacrylamide absorbent resin with the fineness of 200-400 meshes; the shrinkage inhibitor is diazene dicarboxylic acid amide powder; siO in the quartz sand 2 The mass content of the powder is not less than 98 percent, and the fineness is 20 to 200 meshes.
The water reducing agent is a polycarboxylic acid type high-efficiency water reducing agent, and the water reducing rate is more than or equal to 30%; the defoaming agent is an organic silicon defoaming agent.
The steel fiber is copper-plated steel fiber, the diameter is 0.18-0.23 mm, the length is 12-14 mm, and the tensile strength is more than or equal to 2850MPa.
Example 4
The preparation method of the low-shrinkage low-hydration-heat ultrahigh-performance concrete provided by the embodiment comprises the following steps:
1) The proportion of raw materials is as follows: weighing 25% of cement, 5% of silica fume, 8% of steel slag powder, 8.652% of fly ash, 0.6% of calcium oxide, 1.4% of an expanding agent, 0.012% of super water-absorbent resin, 0.008% of a shrinkage inhibitor, 43% of quartz sand, 0.32% of a water reducing agent, 0.008% of a defoaming agent and 8% of steel fiber by mass percent, and accurately weighing the components;
2) Adding the quartz sand and the steel fiber weighed in the step 1) into a dry mixer for dry mixing for 10min;
3) Adding the cement, the silica fume, the steel slag powder, the fly ash, the calcium oxide and the expanding agent weighed in the step 1) into a dry mixer and continuously performing dry mixing for 10min;
4) Adding the super absorbent resin, the shrinkage inhibitor, the water reducer and the defoaming agent weighed in the step 1) into a dry mixer to continuously dry-mix for 15min to obtain the low-shrinkage low-hydration-heat super-high-performance concrete dry powder material.
Wherein the cement is ordinary portland cement, and the strength grade is more than or equal to 42.5 grade; siO in the silica fume 2 The mass content of the nano-particles is more than or equal to 95 percent, and the average particle size is 0.16-0.19 mu m; the average grain diameter of the fly ash is 5-15 mu m.
The calcium oxide is formed by calcining limestone and then grinding, and the specific surface area of the calcium oxide is 480-500 m 2 (iv) kg; the expanding agent is an ettringite type expanding agent, and the specific surface area is 460-480 m 2 /kg。
The super absorbent resin is polyacrylamide absorbent resin with the fineness of 200-400 meshes; the shrinkage inhibitor is diazene dicarboxylic acid amide powder; siO in the quartz sand 2 The mass content of the powder is not less than 98 percent, and the fineness is 20 to 200 meshes.
The water reducing agent is a polycarboxylic acid type high-efficiency water reducing agent, and the water reducing rate is more than or equal to 30 percent; the defoaming agent is an organic silicon defoaming agent.
The steel fiber is copper-plated steel fiber, the diameter is 0.18-0.23 mm, the length is 12-14 mm, and the tensile strength is more than or equal to 2850MPa.
Example 5
The preparation method of the low-shrinkage low-hydration-heat ultrahigh-performance concrete provided by the embodiment comprises the following steps:
1) The proportion of raw materials is as follows: weighing 23% of cement, 4% of silica fume, 9% of steel slag powder, 8.486% of fly ash, 0.75% of calcium oxide, 1.45% of expanding agent, 0.02% of super absorbent resin, 0.008% of shrinkage inhibitor, 47% of quartz sand, 0.28% of water reducing agent, 0.006% of defoaming agent and 6% of steel fiber by mass percentage, and accurately weighing the components;
2) Adding the quartz sand and the steel fiber weighed in the step 1) into a dry mixer for dry mixing for 10min;
3) Adding the cement, the silica fume, the steel slag powder, the fly ash, the calcium oxide and the expanding agent weighed in the step 1) into a dry mixer and continuously performing dry mixing for 10min;
4) Adding the super absorbent resin, the shrinkage inhibitor, the water reducer and the defoaming agent weighed in the step 1) into a dry mixer to continuously dry-mix for 15min to obtain the low-shrinkage low-hydration-heat super-high-performance concrete dry powder material.
Wherein the cement is ordinary portland cement, and the strength grade is more than or equal to 42.5 grade; siO in the silica fume 2 The mass content of the nano-particles is more than or equal to 95 percent, and the average particle size is 0.16-0.19 mu m; the average grain diameter of the fly ash is 5-15 mu m.
The calcium oxide is formed by calcining limestone and then grinding, and the specific surface area of the calcium oxide is 480-500 m 2 (iv) kg; the expanding agent is an ettringite type expanding agent, and the specific surface area is 460-480 m 2 /kg。
The super absorbent resin is polyacrylamide absorbent resin with the fineness of 200-400 meshes; the shrinkage inhibitor is diazene dicarboxylic acid amide powder; siO in the quartz sand 2 The mass content of the powder is not less than 98 percent, and the fineness is 20 to 200 meshes.
The water reducing agent is a polycarboxylic acid type high-efficiency water reducing agent, and the water reducing rate is more than or equal to 30 percent; the defoaming agent is an organic silicon defoaming agent.
The steel fiber is copper-plated steel fiber, the diameter is 0.18-0.23 mm, the length is 12-14 mm, and the tensile strength is more than or equal to 2850MPa.
Example 6
The preparation method of the low-shrinkage low-hydration-heat ultrahigh-performance concrete provided by the embodiment comprises the following steps of:
1) The proportion of raw materials is as follows: weighing 24% of cement, 4% of silica fume, 9.735% of steel slag powder and fly ash according to mass percentage
8.652 percent of calcium oxide, 0.75 percent of expanding agent, 1.45 percent of super absorbent resin, 0.02 percent of shrinkage inhibitor, 0.008 percent of quartz sand, 44.579 percent of water reducing agent, 0.3 percent of defoaming agent and 6.5 percent of steel fiber, and the components are accurately weighed;
2) Adding the quartz sand and the steel fiber weighed in the step 1) into a dry mixer for dry mixing for 5min;
3) Adding the cement, the silica fume, the steel slag powder, the fly ash, the calcium oxide and the expanding agent weighed in the step 1) into a dry mixer to continuously dry-mix for 5min;
4) Adding the super absorbent resin, the shrinkage inhibitor, the water reducer and the defoaming agent weighed in the step 1) into a dry mixer to continuously dry-mix for 10min to obtain the low-shrinkage low-hydration-heat super-high-performance concrete dry powder material.
Wherein the cement is ordinary portland cement, and the strength grade is more than or equal to 42.5 grade; siO in the silica fume 2 The mass content of the nano-particles is more than or equal to 95 percent, and the average particle size is 0.16-0.19 mu m; the average grain diameter of the fly ash is 5-15 mu m.
The calcium oxide is formed by calcining limestone and then grinding, and the specific surface area of the calcium oxide is 480-500 m 2 (iv) kg; the expanding agent is an ettringite type expanding agent, and the specific surface area is 460-480 m 2 /kg。
The super absorbent resin is polyacrylamide absorbent resin with the fineness of 200-400 meshes; the shrinkage inhibitor is diazene dicarboxylic acid amide powder; siO in the quartz sand 2 The mass content of the powder is not less than 98 percent, and the fineness is 20 to 200 meshes.
The water reducing agent is a polycarboxylic acid type high-efficiency water reducing agent, and the water reducing rate is more than or equal to 30%; the defoaming agent is an organic silicon defoaming agent.
The steel fiber is copper-plated steel fiber, the diameter is 0.18-0.23 mm, the length is 12-14 mm, and the tensile strength is more than or equal to 2850MPa.
The performance tests of the low shrinkage, low hydration heat and ultra high performance concrete prepared in examples 1 to 6 were carried out, and the test proportions and test results are shown in table 2.
TABLE 2 Water consumption and Performance testing of Low shrinkage, low hydration Heat, ultra high Performance concrete
Performance testing Amount of water used Degree of expansion Expansion ratio of 3h Dry shrinkage of 28d Adiabatic temperature rise 28d bending resistance 28d resistance to compression
Example 1 7.5％ 650mm 0.06％ 0.005％ 59.7℃ 25.6MPa 142.5MPa
Example 2 7.5％ 670mm 0.062％ 0.006％ 56.7℃ 25.0MPa 140.2MPa
Example 3 7.5％ 620mm 0.09％ 0.015％ 59.5℃ 25.3MPa 141.0MPa
Example 4 7.5％ 630mm 0.07％ 0.009％ 59.4℃ 25.2MPa 141.6MPa
Example 5 7.5％ 640mm 0.08％ 0.007％ 59.1℃ 25.4MPa 141.5MPa
Example 6 7.5％ 660mm 0.082％ 0.009％ 58.9℃ 25.1MPa 141.4MPa
As can be seen from the test results in Table 2, the low-shrinkage low-hydration-heat ultrahigh-performance concrete prepared in the embodiments 1 to 6 has good working performance and mechanical property, the hydration heat of the ultrahigh-performance concrete can be effectively reduced by adding large amounts of silica fume, steel slag powder and fly ash, and the adiabatic temperature rise data is equivalent to that of common high-strength concrete; the addition of the amide organic powder shrinkage inhibitor and the super-absorbent resin can effectively reduce the plastic shrinkage of the ultra-high performance concrete; the drying shrinkage of the ultra-high performance concrete can be suppressed by adding calcium oxide and an ettringite type expanding agent.
The above embodiments are merely examples for clearly illustrating the present invention and do not limit the present invention. Other variants and modifications will be apparent to those skilled in the art in light of the foregoing description, which are not necessarily exhaustive of all embodiments and are therefore intended to be within the scope of the invention.

Claims (10)

1. The low-shrinkage low-hydration-heat ultrahigh-performance concrete is characterized by comprising the following components in percentage by mass: 20 to 25 percent of cement, 4 to 5 percent of silica fume, 8 to 10 percent of steel slag powder, 8 to 10 percent of fly ash, 0.6 to 0.8 percent of calcium oxide, 1.4 to 1.6 percent of expanding agent, 0.01 to 0.02 percent of super absorbent resin, 0.005 to 0.01 percent of shrinkage inhibitor, 43 to 47 percent of quartz sand, 0.28 to 0.32 percent of water reducing agent, 0.005 to 0.008 percent of defoaming agent and 6 to 8 percent of steel fiber.
2. The low shrinkage low hydration heat ultra high performance concrete according to claim 1, wherein the low shrinkage low hydration heat ultra high performance concrete consists of the following components in percentage by mass: 20 to 24 percent of cement, 4 to 4.5 percent of silica fume, 9 to 9.735 percent of steel slag powder, 8.652 to 9 percent of fly ash, 0.7 to 0.75 percent of calcium oxide, 1.45 to 1.5 percent of expanding agent, 0.01 to 0.02 percent of super absorbent resin, 0.005 to 0.008 percent of shrinkage inhibitor, 44.579 to 46 percent of quartz sand, 0.28 to 0.3 percent of water reducing agent, 0.005 to 0.006 percent of defoaming agent and 6.5 to 7 percent of steel fiber.
3. The low shrinkage low hydrothermal and ultra high performance concrete according to claim 1, wherein the low shrinkage low hydrothermal and ultra high performance concrete is composed of the following components in percentage by mass: 22% of cement, 4.5% of silica fume, 9% of steel slag powder, 9% of fly ash, 0.7% of calcium oxide, 1.5% of expanding agent, 0.01% of super-absorbent resin, 0.005% of shrinkage inhibitor, 46% of quartz sand, 0.28% of water reducer, 0.005% of defoaming agent and 7% of steel fiber.
4. The low shrinkage low hydration thermal ultra high performance concrete according to claim 1, 2 or 3, wherein: the cement is ordinary portland cement, and the strength grade is more than or equal to 42.5 grade; siO in the silica fume 2 The mass content of the nano-particles is more than or equal to 95 percent, and the average particle size is 0.16-0.19 mu m; the average grain diameter of the fly ash is 5-15 mu m.
5. The low shrinkage low hydration thermal ultra high performance concrete according to claim 1, 2 or 3, wherein: the calcium oxide is formed by calcining limestone and then grinding, and the specific surface area of the calcium oxide is 480-500 m 2 (iv) kg; the expanding agent is an ettringite expanding agent, and the specific surface area of the expanding agent is 460-480 m 2 (iv) kg; the water reducing agent is a polycarboxylic acid type high-efficiency water reducing agent, and the water reducing rate is more than or equal to 30%; the defoaming agent is an organic silicon defoaming agent.
6. The low shrinkage low hydration thermal ultra high performance concrete according to claim 1 or 2 or 3, wherein: the super absorbent resin is polyacrylamide absorbent resin with the fineness of 200-400 meshes; the shrinkage inhibitor is amide organic powder; siO in the quartz sand 2 The mass content of the powder is not less than 98 percent, and the fineness is 20 to 200 meshes.
7. The low shrinkage low hydration thermal ultra high performance concrete of claim 6, wherein: the polyacrylamide water-absorbent resin is prepared by the following steps: respectively weighing 0.4Kg, 1Kg and 1Kg of sodium p-toluenesulfonate, acrylic acid and acrylamide, adding the sodium p-toluenesulfonate, the acrylic acid and the acrylamide into 2.5L of deionized water for dissolving, and then dropwise adding sodium hydroxide to control the pH value to be alkalescent; then adding 1.5Kg of N, N' -methylene-bisacrylamide and 0.05Kg of potassium persulfate, and reacting for 2h at the water bath temperature of 60 ℃; after the reaction is finished, washing the product with absolute ethyl alcohol, drying at 70 ℃ and grinding into powder to obtain polyacrylamide water-absorbent resin; the amide organic matter is diazene dicarboxylic acid amide.
8. The low shrinkage low hydration thermal ultra high performance concrete according to claim 1, 2 or 3, wherein: the steel fiber is copper-plated steel fiber, the diameter is 0.18-0.23 mm, the length is 12-14 mm, and the tensile strength is more than or equal to 2850MPa.
9. A method for preparing a low shrinkage low hydration thermal ultra high performance concrete according to any one of claims 1 to 8, characterized in that: the method comprises the following steps:
1) Weighing 20-25% of cement, 4-5% of silica fume, 8-10% of steel slag powder, 8-10% of fly ash, 0.6-0.8% of calcium oxide, 1.4-1.6% of expanding agent, 0.01-0.02% of super absorbent resin, 0.005-0.01% of shrinkage inhibitor, 43-47% of quartz sand, 0.27-0.32% of water reducing agent, 0.005-0.008% of defoaming agent and 6-8% of steel fiber for later use;
2) Adding the quartz sand and the steel fiber weighed in the step 1) into a dry mixer for dry mixing for 5-10 min;
3) Adding the cement, the silica fume, the steel slag powder, the fly ash, the calcium oxide and the expanding agent weighed in the step 1) into a dry mixer and continuously performing dry mixing for 5-10 min;
4) Adding the super absorbent resin, the shrinkage inhibitor, the water reducer and the defoaming agent weighed in the step 1) into a dry mixer to continuously dry-mix for 10-15 min to obtain the low-shrinkage low-hydration-heat super-high-performance concrete.
10. The method for preparing low shrinkage low hydration heat ultra high performance concrete according to claim 9, wherein: the rotating speed of the dry mixer is 160-200 r/min.
CN202210713150.1A 2022-06-22 2022-06-22 Low-shrinkage low-hydration-heat ultrahigh-performance concrete and preparation method thereof Pending CN115417650A (en)

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