CN102898084B - High-intensity high-toughness coarse aggregate, preparation method thereof and concrete prepared from high-intensity high-toughness coarse aggregate - Google Patents
High-intensity high-toughness coarse aggregate, preparation method thereof and concrete prepared from high-intensity high-toughness coarse aggregate Download PDFInfo
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Abstract
The invention discloses high-intensity high-toughness coarse aggregate, a preparation method thereof and concrete prepared from the high-intensity high-toughness coarse aggregate. The preparation method for the coarse aggregate comprises the following steps of: (A), uniformly mixing common coarse aggregate and epoxy modified styrene-acrylic emulsion or epoxy modified polyvinylalcohol emulsion; and (B), uniformly mixing materials obtained in the step A and an enhanced plastic material and performing standard curing to obtain the high-intensity high-toughness coarse aggregate, wherein the mass ratio of the materials obtained in the step (A) and the enhanced plastic material is 1:(0.002-0.046), and the enhanced plastic material comprises cement, mineral admixture and an expanding agent in the mass ratio of 1:(0.1-0.3):(0.05-0.1). The compressive strength, the breaking tenacity and the breaking energy of the concrete 28d which is prepared from the provided high-intensity high-toughness coarse aggregate are improved obviously compared with those of the common concrete in the same proportion.
Description
Technical field
The present invention relates to a kind of high-intensity high-tenacity coarse aggregate, its preparation method and concrete prepared therefrom, belong to building material technical field.
Background technology
Concrete has just been existed since inventing from it, and toughness is not enough, the excessive shortcoming of fragility, and generally speaking, concrete tensile strength is about 7%～14% of ultimate compression strength, and concrete ultimate compression strength is higher, and tensile pressure ratio is just less.Concrete is as a kind of heterogeneous composite material, and the behavior according to concrete under stress is generally regarded as by three phase composites: grout matrix, disperse aggregate wherein and the zone of transition phase between grout-aggregate.Wherein, zone of transition is representing the interface region between particles of aggregates and hardened cement paste mutually, and zone of transition is one deck shell around existing around large aggregate, and its generally acknowledged thickness is≤200 μ m, conventionally than a little less than concrete two main phases.On interface region, cement gel and aggregate combine by the snap-in force of Van der Waals force and physics, and bonding strength is lower, and under stress, crack first here occurs.In addition, the chemical bond of concrete material is mainly covalent linkage and ionic linkage, this class Chemical bond energy has greatly directivity, this makes concrete when there is small deformation, can store a large amount of potential energy, once and crackle (comprising original crack, hole and later stage load-bearing crackle) appears in concrete itself, energy just discharges fast at fault location, cause material that crack propagation rapidly occurs and ftracture until destroy.Therefore, the characteristics determined of the chemical bond type of concrete material and the many defects of nonuniformity of material the attribute of its hard brittle material.
The deficiency of toughness of concrete aspect has limited its range of application to a certain extent, and in order to improve concrete toughness, people have successively invented Steel Concrete, polymer concrete, fibrous concrete etc.The concrete toughening mechanism of this three class is different, and mutual relative merits.
Steel Concrete utilizes concrete and high-strength, the internetwork cohesive action of high tenacity Framework Of Steel Reinforcement by the stressed reinforcing mat that passes to more of member, makes the suffered power of concrete substrate be less than its ultimate stress, thereby has improved the toughness of Steel Concrete.Steel Concrete development the earliest, is widely used, and is applicable to the large-scale component that cast has certain regular geometric shapes, is subject in addition reinforcing bar cost impact, and its overall cost is comparatively expensive.
Polymer concrete is the general designation of granule type composite organic-inorganic material, and this class material is having significant development over nearly 30 years.By its composition and manufacture craft, can be divided into: polymer impregnated concrete, polymer cement concrete (also claiming polymer modification concrete), polymer concrete (claiming again resin concrete).The reactive force that polymer concrete utilizes polymer emulsion breakdown of emulsion post polymerization composition granule to be mutually overlapped on inside concrete formation network structure, fill concrete mesoporosity defect, increase inside concrete solid phase particles is realized toughness reinforcing.Polymer concrete is compared with portland cement concrete, has the advantages such as anti-corrosion, wear-resisting, freeze-thawing resistant, meanwhile, and because the lower polymer concrete ultimate compression strength that causes of Young's modulus of organic polymer is compared lower with the normal concrete of same water cement ratio.
Fibrous concrete by the stressed fiber that passes to of cement-based material, makes concrete obtain high-strength, high-ductility and high impervious characteristic by the short glass fibre of a large amount of random distributions in inside and the cohesive action of cement-based material.The fiber that is applied to concrete field can be divided into organic fibre and steel fiber by material.Wherein the concrete design original intention of organic fibre and major function are in order to improve concrete anticracking, anti-permeability performance, and increase toughness (promoting limited), it is not main design objective, Steel Fiber Reinforced Concrete toughness in many fibrous concretes promotes the most remarkable on year-on-year basis, but may causing steel fiber corrosion while being on active service under wet environment, it cause concrete to lose efficacy, in addition steel fiber manufacturing cost is more expensive, and this has also limited its widespread adoption.
Patent 200710053634.3 discloses a kind of preparation method of high-strength and high-ductility light aggregate concrete, the disclosed skill cardia of this document has adopted the method for first toughness reinforcing rear enhancing while gathering materials, this method is only for the preparation of light aggregate concrete, and is not suitable for normal concrete; In addition, this technology has all been used fiber in enhancement process and concrete mixing process, and its toughness reinforcing approach mainly obtains by fiber, still belongs to traditional fibrous concrete category, and these are completely different from the disclosed toughening mechanism of this patent; Finally, the benzene emulsion that surface of aggregate covers low strong low mould is equivalent to introduce at concrete interface place a reduction phase, and this will cause the significantly reduction of concrete strength.
In sum, there is the huge market requirement in high-intensity high-tenacity concrete, but the current deficiency that is limited to the technology that improves concrete strength, toughness has limited its application.
Technology contents
The invention provides a kind of high-intensity high-tenacity coarse aggregate, its preparation method and concrete prepared therefrom.
For solving the problems of the technologies described above, technical scheme of the present invention is:
A preparation method for high-intensity high-tenacity coarse aggregate, comprises the steps:
A, rough sets material and Epoxy Modified Styrene Acrylate Emulsion or epoxy modifying polyethylene alcohol emulsion are mixed, the quality consumption of described Epoxy Modified Styrene Acrylate Emulsion or epoxy modifying polyethylene alcohol emulsion is 1%～3% of rough sets material quality;
B, by steps A gained material with strengthen glue material and mix and mark foster, obtain high-intensity high-tenacity coarse aggregate, described steps A gained material is 1:(0.002～0.046 with the mass ratio that strengthens glue material), described enhancing glue material comprises that mass ratio is 1:(0.1～0.3): the cement of (0.05～0.1), mineral admixture and swelling agent.
In order to raise the efficiency and guarantee product performance, the above-mentioned mark condition of supporting is: in relative humidity, be 90 ± 5%, temperature is under the condition of 20 ± 2 ℃, maintenance 2～3d.
For material in steps A is mixed well, improve toughness and the intensity of product simultaneously, the preparation method of above-mentioned high-intensity high-tenacity coarse aggregate, in steps A, the method of mixing is: rough sets material is injected to Epoxy Modified Styrene Acrylate Emulsion or epoxy modifying polyethylene alcohol emulsion while stirring, after Epoxy Modified Styrene Acrylate Emulsion or epoxy modifying polyethylene alcohol emulsion have been noted, continue to stir 20-30min.
Above-mentioned steps A can complete in agitator kettle, and for emulsion can be uniformly distributed, emulsion injection speed can not be too fast.
After above-mentioned steps A has operated, the high-strength and high ductility polymeric film of common surface of aggregate uniform fold one semicure, obtains toughness reinforcing pre-treatment coarse aggregate.
In order to improve toughness of products, above-mentioned Epoxy Modified Styrene Acrylate Emulsion comprises that mass ratio is 1:(0.25～1.5) benzene emulsion and aqueous epoxy resins, epoxy modifying polyethylene alcohol emulsion comprises that mass ratio is 1:(0.25～1.5) polyvinyl alcohol emulsion and aqueous epoxy resins.
Applicant's discovery, aqueous epoxy resins and benzene emulsion or polyvinyl alcohol emulsion have good synergistic effect.
In above-mentioned steps B, steps A gained material mixes with enhancing glue material, can in stirrer, carry out, and steps A gained material and enhancing glue material are stirred to 2min left and right in stirrer.
Above-mentioned steps B; utilize the residual moisture in semicure high-strength and high ductility polymeric film to react with enhancing glue material; make toughness reinforcing pre-treatment coarse aggregate surface form a cement slurry thin layer; then be placed in relative humidity 90 ± 5%; under 20 ± 2 ℃ of conditions of temperature; maintenance 2～3d, makes the abundant aquation of slurry thin layer on toughness reinforcing pre-treatment coarse aggregate top layer and shape has the protective layer of some strength.
In order to guarantee product performance, the quality solid content of described Epoxy Modified Styrene Acrylate Emulsion or epoxy modifying polyethylene alcohol emulsion is 20-60%.
In order to improve the quality of products, above-mentioned mineral admixture is preferably super fine active mineral admixture, more preferably the mixture of one or both any proportionings in silicon ash or nano silicon; Described swelling agent is the mixture of one or both any proportionings in calcium oxide expansion agents or ettringite class swelling agent.
By the prepared high-intensity high-tenacity coarse aggregate of above-mentioned preparation method.
Utilize a kind of high-intensity high-tenacity coarse aggregate mixing concrete provided by the invention, the ultimate compression strength of concrete 28d, fracture toughness property, energy-to-break obviously improve with the normal concrete of proportioning.The present invention is by being optimized gather materials in concrete-slurry interface, improved the impact contribution of interface on toughness of concrete: between gather materials-slurry, introduce a tenacity excellent, the polymer foil that intensity is suitable, by adjust the ratio of flexible polymer (benzene emulsion/polyvinyl alcohol emulsion) and rigid polymer (epoxy resin) make polymkeric substance and gather materials and slurry between bonding strength and self mechanical property in rational scope, concrete load surpasses after peak load, can make the crackle in concrete expand along the slurry interface that gathers materials, in expansion process there is obvious distortion and absorb energy simultaneously in polymer layer, can significantly improve concrete energy-to-break, by technology, control polymer thin layer thickness (volume), the energy optimization that can make concrete absorb in destructive process, thereby fracture energy of concrete toughness is obviously improved.
Embodiment
In order to understand better the present invention, below in conjunction with embodiment, further illustrate content of the present invention, but content of the present invention is not only confined to the following examples.
Size Effects on Fracture Toughness of Concrete K
iCand energy-to-break G
faccording to the wedging of DL/T5332-2005 < < concrete for hydraulic structure tearing test rules > >, split daraf(reciprocal of farad) and detect, ultimate compression strength detects with reference to GB/T50081-2002 < < standard for test methods of mechanical properties of ordinary concrete > >.
In all examples, strength of cement grade is P II 52.5 below, and fine aggregate is river sand, and fineness modulus is 2.5; PCA-VIII (a) the type high-efficiency water-reducing agent of poly-carboxylic acid that water reducer ①Wei Jiangsu Botexin Materials Co., Ltd produces, the PCA-IV poly carboxylic acid that water reducer ②Wei Jiangsu Botexin Materials Co., Ltd produces reduces, cracking resistance water reducer; The HME-IV concrete high-efficiency expanding agent that swelling agent ①Wei Jiangsu Botexin Materials Co., Ltd produces, SBTJM-III (D) cement expansive material (swelling agent of ettringite class) that swelling agent ②Wei Jiangsu Botexin Materials Co., Ltd produces; 1. polyvinyl alcohol emulsion is produced by Dongguan City Zhan Fan tackiness agent company limited, and model goldfish board, admittedly containing 40%, 2. polyvinyl alcohol emulsion decorates by sky, Tianjin dog sky dog tag 108 glue that Chemical Co., Ltd. produces; Benzene emulsion is the 7199N type benzene emulsion of national Starch Production, solid content 48%; 1. aqueous epoxy resins is that E571 type aqueous epoxy resin emulsion and the aqueous epoxy resin curing agent water of Guangzhou Ou Peng Chemical Manufacture is consolidated 8# 1:1 mixture in mass ratio, 2. aqueous epoxy resins is the E-44 aqueous epoxy resin emulsion that mountain peak, Changzhou Chemical Co., Ltd. produces, admittedly containing 45%; Silicon ash is purchased from saddle U.S. trade Industrial Development Co., Ltd.; Nano silicon is the HTSi-01 purchased from Haitai nanometer.The water reducer of using in embodiment 2,4 be water reducer 2., swelling agent be swelling agent 2., polyvinyl alcohol emulsion be polyvinyl alcohol emulsion 2., epoxy resin be aqueous epoxy resins 2., the water reducer of using in embodiment 1,3,5 and comparative example 1,2,3 be water reducer 1., swelling agent be swelling agent 1., polyvinyl alcohol emulsion be polyvinyl alcohol emulsion 1., epoxy resin be aqueous epoxy resins 1..
Embodiment 1
Rough sets material is that grating meets the basaltic broken stone that 5～20mm continuous grading requires, be placed in agitator kettle, the polymer emulsion that slowly adds rough sets material quality 1% in whipping process, this polymer emulsion is Epoxy Modified Styrene Acrylate Emulsion, wherein benzene emulsion and epoxy resin mass ratio are 1:0.25, after polymer emulsion adds, after continuation stirring 20min, make toughness reinforcing pre-treatment and gather materials; Then the enhancing glue material that adds toughness reinforcing pre-treatment aggregate quality 0.2%, strengthen glue material by cement, silicon ash, swelling agent in mass ratio 1:0.1:0.05 mix, after stirring 2min, take out, then be placed in relative humidity 90 ± 5%, under 20 ± 2 ℃ of conditions of temperature, maintenance 3d makes the extraordinary coarse aggregate (hereinafter to be referred as extraordinary coarse aggregate) that improves toughness of concrete.
Press proportioning: water 160kg/m
3, cement 457kg/m
3, fine aggregate 619kg/m
3, extraordinary coarse aggregate 1140kg/m
3, water reducer 4.57kg/m
3mixing concrete, after moulding, mark is supported 28d, and ultimate compression strength is 64.3MPa, fracture toughness property 0.89MPam
1/2, energy-to-break is 168Nm
-1.
Embodiment 2
Rough sets material is that grating meets the limestone gravel that 5～20mm continuous grading requires, be placed in agitator kettle, the polymer emulsion that slowly adds rough sets material quality 1% in whipping process, this polymer emulsion is Epoxy Modified Styrene Acrylate Emulsion, wherein benzene emulsion and epoxy resin mass ratio are 1:0.25, after polymer emulsion adds, after continuation stirring 20min, make toughness reinforcing pre-treatment and gather materials; Then the enhancing glue material that adds toughness reinforcing pre-treatment aggregate quality 0.2%, strengthen glue material by cement, silicon ash, swelling agent in mass ratio 1:0.1:0.05 mix, after stirring 2min, take out, then be placed in relative humidity 90 ± 5%, under 20 ± 2 ℃ of conditions of temperature, maintenance 3d makes the extraordinary coarse aggregate (hereinafter to be referred as extraordinary coarse aggregate) that improves toughness of concrete.
Press proportioning: water 160kg/m
3, cement 457kg/m
3, fine aggregate 619kg/m
3, extraordinary coarse aggregate 1140kg/m
3, water reducer 4.57kg/m
3mixing concrete, after moulding, mark is supported 28d, and ultimate compression strength is 61.8MPa, fracture toughness property 0.93MPam
1/2, energy-to-break is 178Nm
-1.
Embodiment 3
Rough sets material is that grating meets the basaltic broken stone that 5～20mm continuous grading requires, be placed in agitator kettle, the polymer emulsion that slowly adds rough sets material quality 3% in whipping process, this polymer emulsion is Epoxy Modified Styrene Acrylate Emulsion, wherein benzene emulsion and epoxy resin mass ratio are 1:1.5, after polymer emulsion adds, after continuation stirring 20min, make toughness reinforcing pre-treatment and gather materials; Then the enhancing glue material that adds toughness reinforcing pre-treatment aggregate quality 4.6%, strengthen glue material by cement, nano silicon, swelling agent in mass ratio 1:0.2:0.1 mix, after stirring 2min, take out, then be placed in relative humidity 90 ± 5%, under 20 ± 2 ℃ of conditions of temperature, maintenance 3d makes the extraordinary coarse aggregate (hereinafter to be referred as extraordinary coarse aggregate) that improves toughness of concrete.
Press proportioning: water 160kg/m
3, cement 457kg/m
3, fine aggregate 619kg/m
3, extraordinary coarse aggregate 1140kg/m
3, water reducer 4.57kg/m
3mixing concrete, after moulding, mark is supported 28d, and ultimate compression strength is 68.9MPa, fracture toughness property 0.88MPam
1/2, energy-to-break is 165Nm
-1.
Embodiment 4
Rough sets material is that grating meets the basaltic broken stone that 5～20mm continuous grading requires, be placed in agitator kettle, the polymer emulsion that slowly adds rough sets material quality 1% in whipping process, this polymer emulsion is epoxy modifying polyethylene alcohol emulsion, wherein polyvinyl alcohol emulsion and epoxy resin mass ratio are 1:0.25, after polymer emulsion adds, after continuation stirring 25min, make toughness reinforcing pre-treatment and gather materials; Then the enhancing glue material that adds toughness reinforcing pre-treatment aggregate quality 3%, strengthen glue material by cement, silicon ash, swelling agent in mass ratio 1:0.3:0.1 mix, after stirring 2min, take out, then be placed in relative humidity 90 ± 5%, under 20 ± 2 ℃ of conditions of temperature, maintenance 3d makes the extraordinary coarse aggregate (hereinafter to be referred as extraordinary coarse aggregate) that improves toughness of concrete.
Press proportioning: water 160kg/m
3, cement 457kg/m
3, fine aggregate 619kg/m
3, extraordinary coarse aggregate 1140kg/m
3, water reducer 4.57kg/m
3mixing concrete, after moulding, mark is supported 28d, and ultimate compression strength is 65.7MPa, fracture toughness property 0.95MPam
1/2, energy-to-break is 198Nm
-1.
Embodiment 5
Rough sets material is that grating meets the basaltic broken stone that 5～20mm continuous grading requires, be placed in agitator kettle, the polymer emulsion that slowly adds rough sets material quality 3% in whipping process, this polymer emulsion is epoxy modifying polyethylene alcohol emulsion, wherein polyvinyl alcohol emulsion and epoxy resin mass ratio are 1:1.5, after polymer emulsion adds, after continuation stirring 30min, make toughness reinforcing pre-treatment and gather materials; Then the enhancing glue material that adds toughness reinforcing pre-treatment aggregate quality 3%, strengthen glue material by cement, silicon ash, nano silicon, swelling agent in mass ratio 1:0.1:0.1:0.05 mix, after stirring 2min, take out, then be placed in relative humidity 90 ± 5%, under 20 ± 2 ℃ of conditions of temperature, maintenance 3d makes the extraordinary coarse aggregate (hereinafter to be referred as extraordinary coarse aggregate) that improves toughness of concrete.
Press proportioning: water 160kg/m
3, cement 457kg/m
3, fine aggregate 619kg/m
3, extraordinary coarse aggregate 1140kg/m
3, water reducer 4.57kg/m
3mixing concrete, after moulding, mark is supported 28d, and ultimate compression strength is 68.8MPa, fracture toughness property 0.92MPam
1/2, energy-to-break is 203Nm
-1.
Comparative example 1
In order to contrast the lifting effect of the present invention to toughness of concrete, tested the performance of rough sets material under identical proportioning.According to proportioning: water 160kg/m
3, cement 457kg/m
3, fine aggregate 619kg/m
3, rough sets material 1140kg/m
3, water reducer 4.57kg/m
3mixing concrete, after moulding, mark is supported 28d, and recording its ultimate compression strength is 66.7MPa, fracture toughness property 0.82MPam
1/2, energy-to-break is 108Nm
-1.
Comparative example 2
With reference to embodiment 5, difference is only for polymerized emulsion is benzene emulsion.
Press proportioning: water 160kg/m3, cement 457kg/m3, fine aggregate 619kg/m3, benzene emulsion are processed coarse aggregate 1140kg/m3, water reducer 4.57kg/m3 mixing concrete, after moulding, mark is supported 28d, recording its ultimate compression strength is 56.2MPa, fracture toughness property 0.85MPam1/2, energy-to-break is 121Nm-1.
Comparative example 3
With reference to embodiment 5, difference is only for polymerized emulsion is polyvinyl alcohol emulsion.Press proportioning: water 160kg/m3, cement 457kg/m3, fine aggregate 619kg/m3, polyvinyl alcohol emulsion are processed coarse aggregate 1140kg/m3, water reducer 4.57kg/m3 mixing concrete, after moulding, mark is supported 28d, recording its ultimate compression strength is 58.7MPa, fracture toughness property 0.84MPam1/2, energy-to-break is 134Nm-1.
Claims (8)
1. a preparation method for high-intensity high-tenacity coarse aggregate, is characterized in that: comprise the steps:
A, rough sets material and Epoxy Modified Styrene Acrylate Emulsion or epoxy modifying polyethylene alcohol emulsion are mixed, the quality consumption of described Epoxy Modified Styrene Acrylate Emulsion or epoxy modifying polyethylene alcohol emulsion is 1%～3% of rough sets material quality;
B, by steps A gained material with strengthen glue material and mix and mark foster, obtain high-intensity high-tenacity coarse aggregate, described steps A gained material is 1:(0.002～0.046 with the mass ratio that strengthens glue material), described enhancing glue material comprises that mass ratio is 1:(0.1～0.3): the cement of (0.05～0.1), mineral admixture and swelling agent;
Described Epoxy Modified Styrene Acrylate Emulsion comprises that mass ratio is 1:(0.25～1.5) benzene emulsion and aqueous epoxy resins;
Described epoxy modifying polyethylene alcohol emulsion comprises that mass ratio is 1:(0.25～1.5) polyvinyl alcohol emulsion and aqueous epoxy resins.
2. the preparation method of high-intensity high-tenacity coarse aggregate as claimed in claim 1, is characterized in that: in step B, mark is supported condition and is: in relative humidity, be 90 ± 5%, temperature is under the condition of 20 ± 2 ℃, maintenance 2～3d.
3. the preparation method of high-intensity high-tenacity coarse aggregate as claimed in claim 1 or 2, it is characterized in that: in steps A, the method of mixing is: rough sets material is injected to Epoxy Modified Styrene Acrylate Emulsion or epoxy modifying polyethylene alcohol emulsion while stirring, after Epoxy Modified Styrene Acrylate Emulsion or epoxy modifying polyethylene alcohol emulsion have been noted, continue to stir 20-30min.
4. the preparation method of high-intensity high-tenacity coarse aggregate as claimed in claim 1 or 2, is characterized in that: the quality solid content of described Epoxy Modified Styrene Acrylate Emulsion or epoxy modifying polyethylene alcohol emulsion is 20-60%.
5. the preparation method of high-intensity high-tenacity coarse aggregate as claimed in claim 1 or 2, is characterized in that: described mineral admixture is the mixture of one or both any proportionings in silicon ash or nano silicon.
6. the preparation method of high-intensity high-tenacity coarse aggregate as claimed in claim 1 or 2, is characterized in that: described swelling agent is the mixture of one or both any proportionings in calcium oxide expansion agents or ettringite class swelling agent.
7. by the prepared high-intensity high-tenacity coarse aggregate of the preparation method described in claim 1 to 6 any one.
8. by the prepared concrete of coarse aggregate claimed in claim 7.
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| CN116119957B (en) * | 2022-12-16 | 2024-04-30 | 华能澜沧江水电股份有限公司 | Gabbro fine aggregate, preparation method, compound fine aggregate and application thereof |
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