CN101863631A - Stone aggregate wrapped by microfine fibre polymer mortar thin layer and preparation method thereof - Google Patents
Stone aggregate wrapped by microfine fibre polymer mortar thin layer and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a stone aggregate wrapped by a microfine fibre polymer mortar thin layer and a preparation method thereof; the stone aggregate is formed by stone aggregate inner cores, an adhesive inner wrapping layer, a polymer cement mortar outer wrapping layer and an adhesive microfine fibre hair layer, wherein the adhesive inner wrapping layer and the stone aggregate are adhered firmly; microfine fibre filaments are anchored and rooted on the adhesive inner wrapping layer; and the polymer cement mortar outer wrapping layer and the adhesive inner wrapping layer are soluble mutually and can effectively form a whole body. Active powder in the polymer cement mortar outer wrapping layer contains silica fume, zeolite powder, finely-ground mineral slag, pulverized coal ash and the like, and can generate volcanic ash reaction with Ca(OH)2 crystal at the interface position of the set cement so as to generate gelled materials, and further carry out improved treatment on the weakest interfaces of set cement and the stone aggregate in concrete. The modified stone aggregate of the invention has good affinity with the set cement, and has higher binding power with the set cement.
Description
Technical field
The present invention relates to a kind of modification stone aggregate, help improving the adhesive property of stone aggregate and cement stone interface, can improve the ultimate compression strength of concrete product, improve the use properties of concrete product.
Background technology
After concrete mixes high efficiency water reducing agent, flyash, silica flour, zeolite, steel fiber, polypropylene fibre, can effectively improve concrete intensity and other use propertieies.But, concrete microanalysis research is learnt, water reducer, reactive powder and fiber mix the degree of compactness and the mechanical strength that only can effectively improve cement stone in the concrete, cohesive force to the zone of transition of stone aggregate and cement stone interface is improved DeGrain, exists the zone of stone aggregate and cement stone interface weakness.
Concrete strength is by the decision of the cohesive strength between aggregate intensity, cement strength and cement stone and aggregate surface, and in general, aggregate intensity is enough.Main, the weakest link is the cohesive force at interface between each phase material in the concrete structure, and wherein the cohesive force at cement stone and stone interface plays decisive role to concrete strength.The opinion with submicroscopic level, concrete is the material that is formed by three-phase composite, i.e. aggregate, cement stone and interface transition layer.There are zone of transition in coarse aggregate and hydrated cement paste body interface, and there is thin layer in zone of transition around the coarse aggregate, thick about 10～50 μ m, interfacial transition zone than concrete cement stone and stone aggregate a little less than, the interface region is very big to the influence of concrete mechanics behavior.Mainly have hydrated calcium silicate, Ca (OH) in the interface region
2, ettringite and not the grog particle of hydration reaction and hole, crack.There is the more weak Ca of more intensity (OH) in the interface region
2For many, these characteristics have determined that interfacial transition zone intensity is low, cause the crack easily than cement stone zone for crystal, the pore quantity of interface region, will have a negative impact to the interface bonding.
In field of civil engineering, the achievements in research such as concrete test of stone enveloped with cement method concrete stirring technology and high strength regeneration aggregate configuration show: to the interface of cement stone and stone aggregate improved treatment in advance, can improve the cohesive strength and the interface affinity at cement stone and stone aggregate interface effectively.At present, polymer mortar and polypropylene fibre have obtained using widely, have obtained good engineering effort.If improved treatment is carried out on the stone aggregate surface, can improve the cohesive strength and the interface affinity of stone aggregate and cement stone with polymer mortar interfacial agents and fine synthon.After stone is cleaned oven dry, at the very thin emulsion adhesive of stone aggregate surface parcel one deck, spray high-intensity fine synthon to the stone aggregate gluing surface, stir in advance, and then spraying polymer sand-cement slurry interfacial agents, steam press maintenance is adopted in fully uniform mixing, obtain having the surperficial crude improvement stone aggregate of wrapping up in slurry thin layer and gluing microfibre batt, i.e. the stone aggregate of a kind of wrapped by microfine fibre polymer mortar thin layer of the present invention.Stone aggregate after the utilization improvement carries out concrete member and builds, after the concrete knot is hard, advantages such as cement stone and stone aggregate interface have good viscosifying power, and its concrete product has that ultimate compression strength height, non-deformability are strong, good endurance, inhibition alkali-aggregate reaction are effective.
Summary of the invention
The invention provides stone aggregate of a kind of wrapped by microfine fibre polymer mortar thin layer and preparation method thereof, utilize the present invention can improve affinity, the cohesive strength of cement stone and stone aggregate interface in the concrete product.
The present invention adopts following technical scheme:
The stone aggregate of a kind of wrapped by microfine fibre polymer mortar thin layer of the present invention, comprise: the stone aggregate kernel, on the outside surface of stone aggregate kernel, be enclosed with the tackiness agent inner wrapped layer, on the outside surface of tackiness agent inner wrapped layer, be enclosed with the polymer cement mortar jacket layer, be connected with the outside that fiber on gluing microfibre batt and the described gluing microfibre batt extends to the polymer cement mortar jacket layer on the described tackiness agent inner wrapped layer.
The preparation method of the stone aggregate of a kind of wrapped by microfine fibre polymer mortar thin layer of the present invention,
Step 2 stirs on one side and has the stone aggregate of tackiness agent, Yi Bian spray microfibre, uniform mixing, thus form the gluing microfibre batt of stone aggregate,
Step 4 will be put into the steam curing pond by the stone aggregate that step 3 obtains, the quiet 1h that stops, in 1h, be warming up to 90 ℃～100 ℃, keep 90 ℃～100 ℃, maintenance 4h～8h, in 1h, be cooled to normal temperature, the strength of cement mortar of stone top layer interfacial agents is reached more than the 40MPa, can obtain the stone aggregate of wrapped by microfine fibre polymer mortar thin layer.
Compared with prior art, the present invention has following technique effect:
Main purpose of the present invention is to improve affinity, the cohesive strength of cement stone and stone aggregate interface in the concrete product.Product is made of stone aggregate kernel, tackiness agent inner wrapped layer, polymer cement mortar jacket layer and gluing microfibre batt.The manufacture method of this modification stone aggregate comprises following processing step: stone aggregate is cleaned oven dry, and stone aggregate basic unit face is wrapped up in tackiness agent, sprays the microfibre silk, and polymer cement mortar is wrapped up in outward, steam press maintenance, and the modification stone aggregate stores, the concrete preparation.Modification stone aggregate of the present invention has crude physical surface, and its surface layer material moiety is close with cement stone composition, and modification stone aggregate and cement stone have good affinity, and is higher with the cohesive force of cement stone.The concrete product of preparing with the modification stone aggregate has that ultimate compression strength height, non-deformability are strong, good endurance, inhibition alkali-aggregate reaction are effective, being easy to get property of material, normal temperature construction simplicity, advantage such as cheap.The modification stone aggregate can be used as the coarse aggregate of preparation extra-high-speed reinforced concrete, and the improvement complete processing that stone aggregate is wrapped up in the cellulosic polymer mortar thin layer outward has more significant improved effect for the cobble aggregate.
In order to reduce space and the microscopic checks quantity in the concrete, in order to improve concrete strength and to improve concrete use properties, proposed many effective measure of improving concrete performance, major measure is: in order to reduce voidage, to improve intensity, adopt extremely low water cement ratio (≤0.2); In order to improve concrete workability, mix high efficiency water reducing agent; In order to strengthen concrete aquation and pozzolanic reaction, active very high SILICA FUME, zeolite, flyash and ground blast furnace slag have been adopted; In order to improve concrete ductility, mixed thin steel fiber and other synthon, and adopted the High Temperature High Pressure maintaining process.Above-mentioned measure effectively raises concrete degree of compactness, compression and tensile strength, workability and weather resistance.But its material cost heightens, makes difficulty, processing condition harshness, is difficult to large scale application.
Concrete strength is by the decision of the cohesive strength between aggregate intensity, cement strength and cement stone and aggregate surface, and in general, aggregate intensity is enough.Main, the weakest link is the cohesive force at interface between each phase material in the concrete structure, and wherein the cohesive force at cement stone and stone interface plays decisive role to concrete strength.Stone enveloped with cement method concrete stirring technology studies show that, clean slurry lapicide artistic skill enough improves the concrete bulk strength, improve the even divergence of material granule, the mechanical snap effect at refinforced cement stone and stone interface, stop the part free-water to concentrate the boundary strength between refinforced cement stone and stone to stone and grout interface.Regenerated aggregate concrete is relevant to be studies show that: its intensity of concrete of high strength regeneration aggregate configuration is higher, its reason mainly is its bonding interface and higher interface binding intensity preferably, regeneration aggregate is owing to form bigger physical bond intensity between the uneven easy and cement stone of physical surface, the high surfaces activity of regeneration aggregate is easy to form higher chemical bonding intensity with the grout reaction, regeneration aggregate and novel concrete cement stone have close Young's modulus, thereby concrete is when stressed, to produce less stress-difference at the interface, trend at the stressed generation microfracture of bonding interface reduces, and this experimental phenomena is called the high strength regeneration aggregate to concrete interface reinforcing effect.Therefore, stone aggregate surface adopts gluing interfacial agents to carry out extraordinary crude processing, makes itself and the cohesive strength raising of cement stone, thereby can improve concrete intensity, improves concrete use properties.
At the weak problem of concrete stone aggregates interface binding intensity, should adopt an effective measure and strengthen the viscosifying power at cement stone and stone aggregate interface, so that improve mechanical property, deformation performance and the endurance quality of concrete product.The present invention proposes a kind of stone aggregate of wrapped by microfine fibre polymer mortar thin layer, main purpose is to improve affinity, the cohesive strength of cement stone and stone aggregate interface in the concrete product.Product is made of stone aggregate kernel, tackiness agent inner wrapped layer, polymer cement mortar jacket layer and gluing microfibre batt.Wrap up in the gluing fibre thin layer purpose of slurry and make stone aggregate carry out improved treatment exactly, allow stone aggregate put on " coat " and grow " hair ", so that improve stone aggregate and cement stone has better cohesive strength and interface affinity.
The present invention carries out improved treatment with gluing interfacial agents and technical fiber to the stone aggregate surface, can improve the cohesive strength and the interface affinity of stone aggregate and cement stone.The tackiness agent parcel is cleaned the stone aggregate of oven dry, stone aggregate shows can form gluing firm basic unit's face, so that microfibre silk and stone aggregate surface adhesion anchoring are together taken root, tackiness agent inner wrapped layer and polymer cement mortar jacket layer should have intermiscibility, so that tackiness agent basic unit face that stone aggregate is wrapped up in outward and interfacial agents skin can effectively form integral body.The effect of microfibre batt is drawknot effect and the cohesive strength that increases stone aggregate and cement stone, thereby improves concrete intensity, and improves concrete deformation performance.The material moiety of polymer cement mortar jacket layer is close with cement stone, so that guarantee affinity, cohesive strength between cement stone and the improvement stone aggregate.The polymer cement mortar jacket layer is made up of materials such as organic adhesion agent, cement, reactive powder, water reducers, and the composition of organic adhesion agent can have affinity, cohesive strength preferably with the tackiness agent inner wrapped layer; Cement composition and interface moisture hydration reaction generate gelling material, further bond microfibre; Comprise SILICA FUME, zeolite powder, ground slag and flyash in the reactive powder, can with the Ca (OH) at interface
2Crystal produces pozzolanic reaction, generates gelling material; The admixture of high efficiency water reducing agent can reduce the water content in the mortar interface agent, so that reduce the fine hole and the microscopic checks at interface.The manufacture method of this modification stone aggregate comprises following processing step: stone aggregate is cleaned oven dry, and stone basic unit face is wrapped up in glue, sprays the fine-fibered silk, and polymer cement mortar is wrapped up in outward, steam press maintenance, and the modification aggregate stores, the concrete preparation.Modification stone aggregate finished product of the present invention is the siccative commodity.
Modification stone aggregate of the present invention has crude physical surface, and its surface layer material moiety is close with cement stone composition, and modification stone aggregate and cement stone have good affinity, and is higher with the cohesive force of cement stone.Advantages such as the concrete product of preparing with the modification stone aggregate has that ultimate compression strength height, non-deformability are strong, good endurance, inhibition alkali-aggregate reaction are effective.
The stone aggregate of a kind of wrapped by microfine fibre polymer mortar thin layer of the present invention, make the stone aggregate interface carry out improved treatment, allow stone aggregate put on " coat " and grow " hair ", so that improvement stone aggregate and cement stone have better cohesive strength and interface affinity, can be used as the improvement stone aggregate of the above extra-high-speed reinforced concrete of preparation C80.Product is made of stone aggregate kernel, tackiness agent inner wrapped layer, polymer cement mortar jacket layer and gluing microfibre batt.Novel stone aggregate after the utilization improvement carries out concrete member and builds, after the concrete knot is hard, cement stone and stone aggregate interface have good viscosifying power, and its concrete product has that ultimate compression strength height, non-deformability are strong, good endurance, inhibition alkali-aggregate reaction are effective, being easy to get property of material, normal temperature construction simplicity, advantage such as cheap.
Tackiness agent inner wrapped layer and stone aggregate are gluing, and firmly the anchoring of microfibre silk is taken root on the tackiness agent inner wrapped layer, and polymer cement mortar jacket layer and tackiness agent inner wrapped layer mix and can effectively form integral body.The improvement stone aggregate has crude physical surface, and the inorganic components that contains in the polymer cement mortar jacket layer is close with cement stone composition, can guarantee interface affinity, the cohesive strength of cement stone and improvement stone aggregate.Reactive powder in the polymer cement mortar jacket layer comprises SILICA FUME, zeolite powder, ground slag and flyash isoreactivity material, can with the Ca (OH) at cement stone interface place
2Crystal produces pozzolanic reaction, generates gelling material, and cement stone the weakest in the concrete and stone aggregate interface have been carried out improved treatment.Therefore, the modification stone aggregate can improve cement stone and stone aggregate viscosifying power at the interface, strengthens ultimate compression strength, non-deformability and the weather resistance of concrete product.The tackiness agent inner wrapped layer wrapped up stone aggregate, stoped the alkali-aggregate reaction of basic ion and stone aggregate in the hydrate.Wrapped by microfine fibre polymer mortar thin layer stone aggregate of the present invention especially is fit to preparation extra-high-speed reinforced concrete.Compare (adopting quartz sand to replace stone aggregate, strengthen cement consumption, mix steel fiber and steam press maintenance) with UHPC extra-high-speed reinforced concrete, have being easy to get property of material, normal temperature construction simplicity, advantage such as cheap.The improvement complete processing that stone aggregate is wrapped up in the cellulosic polymer mortar thin layer outward has more significant improved effect for the cobble aggregate.
Description of drawings
Fig. 1 is a stone aggregate synoptic diagram of wrapping up in the gluing fiber of slurry;
Have among the figure: stone aggregate kernel 1; Tackiness agent inner wrapped layer 2; Polymer cement mortar jacket layer 3; Gluing microfibre batt 4.
Embodiment
A kind of stone aggregate of wrapped by microfine fibre polymer mortar thin layer, comprise: stone aggregate kernel 1, on the outside surface of stone aggregate kernel 1, be enclosed with tackiness agent inner wrapped layer 2, on the outside surface of tackiness agent inner wrapped layer 2, be enclosed with polymer cement mortar jacket layer 3, be connected with the outside that fiber on gluing microfibre batt 4 and the described gluing microfibre batt 4 extends to polymer cement mortar jacket layer 3 on the described tackiness agent inner wrapped layer 2.
Embodiment 2
A kind of preparation method of stone aggregate of wrapped by microfine fibre polymer mortar thin layer,
Step 2 stirs on one side and has the stone aggregate of tackiness agent, Yi Bian spray microfibre, uniform mixing, thus form the gluing microfibre batt 4 of stone aggregate,
Step 4 will be put into the steam curing pond by the stone aggregate that step 3 obtains, the quiet 1h that stops, in 1h, be warming up to 90 ℃～100 ℃, keep 90 ℃～100 ℃, maintenance 4h～8h is cooled to normal temperature in 1h, through after the vapor cure, the strength of cement mortar of stone top layer interfacial agents reaches more than the 40MPa, can obtain the stone aggregate of wrapped by microfine fibre polymer mortar thin layer.
Described organic adhesion agent is polyvinyl acetate (PVA) latex or VAE vinyl acetate-ethylene copolymerization emulsions.
Described microfibre is glass fibre, steel fiber, carbon fiber, basalt fibre, polyacrylonitrile fibre, polyvinyl alcohol fiber, trevira, tynex or polypropylene fibre.
Described its composition of polymer interface agent, proportioning (mass ratio) are flyash: 10-20%, silica flour 5-10%, sand: 30-40%, cement: 30-40%, latex powder: 5.0-7.0%, water-holding agent: 0.1-0.5%, defoamer: 0.05-0.10%, high-efficiency water-reducing agent of poly-carboxylic acid 0.5-1.0%, water/gelling material mass ratio 0.15-0.27.
Below the present invention is made explanation in more detail:
The concrete stone aggregates of parcel cellulosic polymer mortar thin layer of the present invention should be made specially in advance, and its manufacture craft flow process is: stone is cleaned oven dry, and---stone basic unit face is wrapped up in glue, and------polymer cement mortar is wrapped up in outward, and---steam press maintenance---finished product storage---improvement stone is used to spray microfibre.In making the operation of improvement stone aggregate, must be noted that and promptly grab thin each link, the strict gelation time of controlling each procedure, concrete key point for process is as follows:
(1) stone is cleaned oven dry
Concrete should be selected scleroid rubble for use, and particle diameter should be at 5～20mm.When the stone aggregate silt content is excessive, can reduce the cohesive strength at concrete cement stone and stone aggregate interface, cause aggregate interface microcrack, thereby can significantly reduce concrete resistance to compression, tensile strength, reduce concrete Young's modulus, influence concrete weather resistance and frost resistance, thereby stone aggregate should adopt stone scrubber to clean oven dry.
(2) stone basic unit face is wrapped up in glue
The tackiness agent parcel is cleaned the stone aggregate of oven dry, stone aggregate shows can form gluing firm basic unit's face, so that fine-fibered silk and stone aggregate surface adhesion anchoring are together taken root, tackiness agent inner wrapped layer and polymer cement mortar jacket layer should have intermiscibility, so that tackiness agent basic unit face that stone aggregate is wrapped up in outward and interfacial agents skin can form integral body effectively.
Building glue mainly contains aqueous epoxy emulsion, formaldehyde polyvinyl acetal water (107 glue), acrylamide glue, aqueous polyvinyl acetate emulsion and VAE emulsion.Wherein the aqueous epoxy emulsion price is more expensive, formaldehyde polyvinyl acetal water (107 glue) though, acrylamide glue has the low advantage of price, has little toxicity.
The VAE emulsion is the abbreviation of vinyl acetate-ethylene copolymerization emulsions, is to be basic raw material with vinyl acetate between to for plastic and vinyl monomer, the macromolecule emulsion that forms by the emulsion polymerisation process copolymerization with other auxiliary material.The VAE emulsion has resistance to acids and bases preferably, the VAE emulsion has good cementability, the VAE emulsion can bond the filler of cheapness and keep enough cohesive forces with very high ratio, it has good adhesive effect to goods such as fiber, timber, paper, plastics film, aluminium foil, cement, potteries.Suggestion stone aggregate primary adhesive adopts the VAE emulsion, adopts the method for spraying and flooding the VAE emulsion, makes the stone aggregate surface form very thin one deck tackiness agent inner wrapped layer, and thickness of thin layer is preferably 20 μ m～30 μ m.
(3) spray microfibre
The effect of microfibre batt is drawknot effect and the cohesive strength that increases stone aggregate and cement stone, thereby improves concrete intensity, and improves concrete deformation performance.Fiber commonly used in the construction work has: glass fibre, steel fiber, carbon fiber, basalt fibre, polyacrylonitrile fibre, polyvinyl alcohol fiber, trevira, tynex and polypropylene fibre, the glass fibre alkali resistance is poor, steel fiber easy-to-rust, conglomeration, carbon fiber is on the high side.
Polypropylene fibre, be to be starting material with the polypropylene, form by the special process manufacturing, the polypropylene technical fiber can be divided into monofilament and netted two kinds of forms, it is a kind of novel concrete reinforced fiber, through special process for treating surface, guaranteed fiber in concrete, have splendid dispersiveness and with the bond stress of cement body, be called as concrete " less important stiffening web ".Polypropylene fibre has abundant raw material, cheap, has advantages such as acidproof, alkaline-resisting.Polypropylene fibre tensile strength is higher, and (300～450MPa), the polypropylene fibre equivalent diameter is little, is generally 18-30 μ m.Therefore, the fiber fur layer of improvement stone aggregate should be selected polypropylene fibre for use.
Adopt the method for spraying polypropylene fibre, spray high-intensity fine synthon to the stone aggregate gluing surface.Stirring on one side has the stone aggregate of tackiness agent basal plane, Yi Bian spray polypropylene fibre, uniform mixing, thus form the gluing fiber fur layer of stone aggregate.
(4) polymer cement mortar is wrapped up in outward
The polymer cement mortar jacket layer should select for use the organic and inorganic polymer cement that combines to starch only as the jacket layer material, polymer cement mortar jacket layer and tackiness agent inner wrapped layer should have good intermiscibility and cohesive force, preferably select for use with a kind of polymer emulsion.Inorganic components in the polymer cement mortar jacket layer should be close with cement stone composition, so that guarantee interface affinity, the cohesive strength of cement stone and improvement stone aggregate.
Organic and the inorganic polymer cement mortar interfacial agents that combines has very high cohesive strength, and polymer cement mortar interfacial agents adhesive tensile resistance intensity generally can reach 2.0～3.0Mpa, can be used as the stone aggregate jacket layer.Inorganic cement mortar interface agent cohesive strength is lower, should not be used as the stone aggregate jacket layer.
The polymer cement mortar jacket layer should be by organic adhesion agent, cement, quartz sand, reactive powder, water reducer, defoamer, water-holding agent, stablizer, materials such as swelling agent are formed, the composition of organic adhesion agent should be selected same kind for use with the tackiness agent inner wrapped layer, in guaranteeing, skin has affinity preferably, cohesive strength, organic adhesion agent mainly contains aqueous epoxy emulsion, formaldehyde polyvinyl acetal water (107 glue), acrylamide glue, aqueous polyvinyl acetate emulsion and VAE emulsion etc., the VAE emulsion is the organic adhesion agent that optimum is used as the polymer cement mortar jacket layer, the VAE emulsion has cohesive strength height, advantages such as nontoxicity; The jacket layer cement composition should be identical with the cement composition of cement stone, the hydration reaction of jacket layer cement generates gelling material, can further bond microfibre, cement stone with the improvement stone aggregate at the interface, the cement clinker of unnecessary not hydration reaction can produce hydration reaction with grout in the jacket layer, strengthens the cohesive force of cement aggregate and cement stone; The reactive powder of jacket layer comprises SILICA FUME, zeolite powder, ground slag and flyash isoreactivity material, can with Ca (OH) at the interface
2Crystal produces pozzolanic reaction, generates gelling material; The admixture of high efficiency water reducing agent can reduce the water content in the mortar interface agent, so that reduce the fine hole and the microscopic checks at interface, naphthalene series high-efficiency water-reducing agent can reduce water consumption 15%～20%, and high-efficiency water-reducing agent of poly-carboxylic acid can reduce water consumption 25%～30%; Defoamer is in order to eliminate the bubble that the organic polymer tackiness agent is produced; Water-holding agent is too fast in order to prevent the organic adhesion agent sclerosis, should select Vltra tears for use; Stablizer is to prevent tackiness agent aged material; Swelling agent adopts aluminium sulfate expanding agent, to prevent polymer mortar jacket layer shrinkage cracking.
The manufacture craft of polymer cement mortar jacket layer can adopt methods such as spraying, brushing and bullet are coated with, and the smearing thickness of jacket layer is preferably 1.0～2.0mm.Add and have the special wooden shot (the gluing quartz sand of surperficial epoxy) on uneven surface, mix the mixed powder that an amount of cement, quartz sand, reactive powder are formed, adopt the improvement stone aggregate that amalgamator will be wrapped up in polymer cement mortar outward to stir, make that improvement stone aggregate surface is crude.
(5) steam press maintenance, storage
The effect of steam press maintenance is the growth of the intensity of accelerate concrete, the inside concrete crack that prevent to shrink, the temperature difference causes.In order to improve the production rate of wrapping up in glue fiber improvement stone aggregate product, in order to accelerate the setting rate of mortar interface agent, should adopt the steam press maintenance measure, to improve the equipment turn-around speed.
The stone aggregate of gluing fibre thin layer is put into steam curing pond (hole), and the quiet 1h～2h that stops slowly is warming up to 90 ℃～100 ℃, and maintenance 4h～8h reaches more than the 40MPa strength of cement mortar of stone top layer interfacial agents, can the finished product discharging.Modification stone aggregate behind the steam press maintenance is transported to the warehouse booth, keeps properly, so that use during concrete for making.
(6) the improvement stone is used
Improvement stone aggregate of the present invention generally should be as the stone aggregate of high-strength concrete, and concrete manufacture craft still is a common process.With cement, sand, improvement stone aggregate, high efficiency water reducing agent or add compounds such as flyash, F breeze, slag, SILICA FUME simultaneously, adopt lower water cement ratio, according to rational proportioning, thereby can obtain high-strength concrete.
Novel stone aggregate after the utilization improvement carries out concrete placement, after the concrete knot is hard, advantages such as cement stone and stone aggregate interface have good viscosifying power, and its concrete product has that ultimate compression strength height, non-deformability are strong, good endurance, inhibition alkali-aggregate reaction are effective.Prepared high-strength concrete has being easy to get property of material, normal temperature, common process construction simplicity, advantage such as cheap.
Claims (4)
1. the stone aggregate of a wrapped by microfine fibre polymer mortar thin layer, comprise: stone aggregate kernel (1), it is characterized in that, on the outside surface of stone aggregate kernel (1), be enclosed with tackiness agent inner wrapped layer (2), on the outside surface of tackiness agent inner wrapped layer (2), be enclosed with polymer cement mortar jacket layer (3), be connected with the outside that fiber on gluing microfibre batt (4) and the described gluing microfibre batt (4) extends to polymer cement mortar jacket layer (3) on the described tackiness agent inner wrapped layer (2).
2. the preparation method of the stone aggregate of the described wrapped by microfine fibre polymer mortar thin layer of claim 1 is characterized in that,
Step 1 is cleaned oven dry with stone aggregate kernel (1), the stone aggregate kernel (1) that maybe will clean oven dry at stone aggregate kernel (1) surface sprinkling organic adhesion agent is immersed in the organic adhesion agent, thereby forming a layer thickness on stone aggregate kernel (1) surface is the tackiness agent inner wrapped layer (2) of 20 μ m～30 μ m
Step 2 stirs on one side and has the stone aggregate of tackiness agent, Yi Bian spray microfibre, uniform mixing, thus form the gluing microfibre batt of stone aggregate (4),
Step 3 polymer cement mortar jacket layer (3) selects for use the organic and inorganic polymer cement that combines to starch only as the jacket layer material, adopt spraying or brushing method, the clean slurry of polymer cement is covered in the surface to be had on the stone aggregate kernel (1) of tackiness agent inner wrapped layer (2)
Step 4 will be put into the steam curing pond by the stone aggregate that step 3 obtains, the quiet 1h that stops, in 1h, be warming up to 90 ℃～100 ℃, keep 90 ℃～100 ℃, maintenance 4h～8h, in 1h, be cooled to normal temperature, the strength of cement mortar of stone top layer interfacial agents is reached more than the 40MPa, can obtain the stone aggregate of wrapped by microfine fibre polymer mortar thin layer.
3. preparation method according to claim 2 is characterized in that, organic adhesion agent is polyvinyl acetate (PVA) latex or VAE vinyl acetate-ethylene copolymerization emulsions.
4. preparation method according to claim 2 is characterized in that, microfibre is glass fibre, steel fiber, carbon fiber, basalt fibre, polyacrylonitrile fibre, polyvinyl alcohol fiber, trevira, tynex or polypropylene fibre.
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