CN107777981A - A kind of regeneration concrete and preparation method thereof - Google Patents

A kind of regeneration concrete and preparation method thereof Download PDF

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Publication number
CN107777981A
CN107777981A CN201711062304.0A CN201711062304A CN107777981A CN 107777981 A CN107777981 A CN 107777981A CN 201711062304 A CN201711062304 A CN 201711062304A CN 107777981 A CN107777981 A CN 107777981A
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China
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parts
weight
regeneration
concrete
rubble
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CN201711062304.0A
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Inventor
王翀昊
谢建和
张冰雪
方驰
黄亮
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Guangdong University of Technology
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Guangdong University of Technology
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Priority to CN201711062304.0A priority Critical patent/CN107777981A/en
Publication of CN107777981A publication Critical patent/CN107777981A/en
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/24Compositions 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 alkyl, ammonium or metal silicates; containing silica sols
    • C04B28/26Silicates of the alkali metals
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00017Aspects relating to the protection of the environment
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/05Materials having an early high strength, e.g. allowing fast demoulding or formless casting
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

Abstract

The invention belongs to building material field, more particularly to a kind of regeneration concrete and preparation method thereof.Regeneration concrete provided by the invention is made up of the raw material including following parts by weight:Regenerate 1000~1300 parts of rubble;400~600 parts of sand;100~500 parts of slag powders;100~500 parts of flyash;15~25 parts of alkali metal hydroxide;60~75 parts of alkali silicate;240~260 parts of water;5~10 parts of retardation water reducing agent.The present invention to regenerate rubble and sand as aggregate, using the industry byproduct such as slag powders and flyash after alkali-activated carbonatite as binder materials binding agent, obtained a kind of environmentally friendly while there is the concrete material of excellent performance.The concrete material not only realizes effective recycling of abandoned building and trade waste, also has the advantages that setting time is fast, early strength is high, is advantageous to be applied in rescue and relief work and national defense construction.

Description

A kind of regeneration concrete and preparation method thereof
Technical field
The invention belongs to building material field, more particularly to a kind of regeneration concrete and preparation method thereof.
Background technology
With the continuous development of economy, traditional architecture is already through having reached unprecedented scale, and its one side is greatly The urbanization process of China is accelerated, but then, highly energy-consuming, high pollution, high waste, extensive live manual work, Extremely serious negative effect is all brought to ecology, to city, to industrial structure etc..
Building waste often produces transformation dismounting, the dismounting and maintenance of urban operating mechanism of the old buildings in Process of Urbanization Construction And the remaining waste material of job site or building element factory, wherein sizable ratio is discarded concrete.Traditional discarded coagulation Soil processing method is mainly transported to countryside and stacks or fill, and not only to spend substantial amounts of freight charges, and to take a large amount of treasured Expensive land resource, secondary pollution is caused to environment.Meanwhile the mainly Portland cement that we use at present, at it During production, due to the calcining of lime stone and the burning of fossil fuel, substantial amounts of carbon dioxide is produced, with air CO2Deng increasing for calefacient, terrestrial climate is warmed, cause greenhouse effects.Flyash is received from the flue gas after coal combustion The fine ash got off is caught, its storage does not only take up a large amount of soils, can also cause serious environmental pollution.Slag is that blast furnace ironmaking obtains The fused mass based on ca aluminosilicate, its a large amount of stockpiling necessarily causes the pollution and harm to air, soil, water system.For a long time Since, how to properly process abandoned building and both industrial solid castoffs, be related to national economy can The emphasis of sustainable development.
In addition, in building industrialization development, construction unit is strongly required concrete with unit in charge of construction has higher morning Phase intensity and shorter setting time are to meet construction period requirement.Therefore, early strength and the shortening of concrete how to be improved The setting time of concrete is industry problems urgently to be resolved hurrily at present.
The content of the invention
In view of this, it is provided by the invention it is an object of the invention to provide a kind of regeneration concrete and preparation method thereof Regeneration concrete realizes construction waste recycling, while has the advantages that setting time is fast, early strength is high.
The invention provides a kind of regeneration concrete, is made up of the raw material including following parts by weight:
Preferably, the regeneration rubble includes 5~10mm of particle diameter 10~20mm of regeneration rubble and particle diameter regeneration rubble.
Preferably, the mass ratio of 10~20mm of regeneration rubble and particle diameter of the 5~10mm of particle diameter regeneration rubble is 1: (0.5~2).
Preferably, the apparent density of the regeneration rubble is 2000~3000kg/m3;The bulk density of the regeneration rubble For 1000~1200kg/m3;The water absorption rate of the regeneration rubble is 4~8%;The crush index of the regeneration rubble for 15~ 20%.
Preferably, the proportion of the sand is 2~3;The modulus of fineness of the sand is 2~3.
Preferably, the specific surface area of the slag powders is 300~500m2/kg;The density of the slag powders is 2~3g/ cm3
Preferably, the specific surface area of the flyash is 500~700m2/kg;The density of the flyash is 2~3g/ cm3
Preferably, in terms of parts by weight, the raw material includes following components:
The water content of the sodium hydrate aqueous solution is 70~80wt%;The water content of the sodium silicate aqueous solution be 60~ 70wt%.
The invention provides a kind of preparation method of regeneration concrete described in above-mentioned technical proposal, comprise the following steps:
A), regeneration rubble, sand, slag powders, flyash, alkali metal hydroxide, alkali silicate, water and slow setting are subtracted Aqua mixes, and obtains concrete slurry;
B), the concrete slurry obtains regeneration concrete by solidification and maintenance.
Preferably, the step a) is specifically included:
A1), partial moisture is not mixed with alkali metal hydroxide and alkali silicate, respectively obtains alkali metal hydrogen-oxygen The compound aqueous solution and alkali metal silicate aqueous solution;
A2), the water for regenerating rubble and surplus is mixed, obtains the first compound;
A3), first mixture is mixed with slag powders, flyash and sand, obtains the second compound;
A4), the second compound, alkali metal hydroxide aqueous solution, alkali metal silicate aqueous solution and the slow setting are subtracted Aqua mixes, and obtains concrete slurry.
Compared with prior art, the invention provides a kind of regeneration concrete and preparation method thereof.It is provided by the invention again Growing concrete is made up of the raw material including following parts by weight:Regenerate 1000~1300 parts of rubble;400~600 parts of sand;Slag powders 100~500 parts;100~500 parts of flyash;15~25 parts of alkali metal hydroxide;60~75 parts of alkali silicate;Water 240 ~260 parts;5~10 parts of retardation water reducing agent.The present invention is to regenerate rubble and sand as aggregate, with industry such as slag powders and flyash Byproduct is used as binder materials binding agent after alkali-activated carbonatite, has obtained a kind of environmental protection while has had the concrete of excellent performance Material.The concrete material not only realizes effective recycling of abandoned building and trade waste, when also having condensation Between it is fast, early strength is high the advantages that, be advantageous to be applied in rescue and relief work and national defense construction.Test result indicates that this The 7 days compression strength of regeneration concrete provided is invented more than 55MPa, the presetting period is 17~28min, final setting time for 38~ 53min。
Embodiment
The technical scheme in the embodiment of the present invention is clearly and completely described below, it is clear that described embodiment Only part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the common skill in this area The every other embodiment that art personnel are obtained under the premise of creative work is not made, belong to the model that the present invention protects Enclose.
The invention provides a kind of regeneration concrete, is made up of the raw material including following parts by weight:
Regeneration concrete provided by the invention includes regeneration rubble, sand, slag powders, flyash, alkali metal hydroxide, alkali Metal silicate, water and retardation water reducing agent.Wherein, the regeneration rubble is the broken material of discarded concrete;The regeneration rubble Preferably include 5~10mm of particle diameter 10~20mm of regeneration rubble and particle diameter regeneration rubble;The regeneration of the 5~10mm of particle diameter is broken The mass ratio of 10~20mm of stone and particle diameter regeneration rubble is preferably 1:(0.5~2), more preferably 1:1;The regeneration rubble Apparent density is preferably 2000~3000kg/m3, concretely 2100kg/m3、2200kg/m3、2300kg/m3、2400kg/m3、 2500kg/m3、2519kg/m3、2600kg/m3、2700kg/m3、2800kg/m3Or 2900kg/m3;The accumulation of the regeneration rubble Density is preferably 1000~1200kg/m3, concretely 1050kg/m3、1100kg/m3、1150kg/m3、1187kg/m3Or 1190kg/m3;The water absorption rate of the regeneration rubble is preferably 4~8%, and concretely 4%, 5%, 6%, 7% or 8%;It is described Regenerate rubble crush index be preferably 15~20%, concretely 15%, 16%, 17%, 17.5%, 18%, 19% or 20%;The regeneration rubble preferably conforms to continuous grading.In the present invention, the content of the regeneration rubble in the feed is 1000 ~1300 parts by weight, concretely 1010 parts by weight, 1020 parts by weight, 1030 parts by weight, 1038 parts by weight, 1040 parts by weight, 1050 parts by weight, 1060 parts by weight, 1070 parts by weight, 1080 parts by weight, 1090 parts by weight, 1100 parts by weight, 1110 parts by weight, 1120 parts by weight, 1130 parts by weight, 1140 parts by weight, 1150 parts by weight, 1155 parts by weight, 1160 parts by weight, 1170 parts by weight, 1180 parts by weight, 1190 parts by weight, 1200 parts by weight, 1210 parts by weight, 1220 parts by weight, 1225 parts by weight, 1230 parts by weight, 1240 parts by weight, 1250 parts by weight, 1260 parts by weight, 1270 parts by weight, 1280 parts by weight, 1290 parts by weight or 1300 weight Part.
In the present invention, the sand is preferably river sand;The proportion of the sand is preferably 2~3, concretely 2.1,2.2, 2.3,2.4,2.5,2.6,2.69,2.7,2.8,2.9 or 3;The modulus of fineness of the sand is preferably 2~3, concretely 2.1, 2.2nd, 2.3,2.4,2.5,2.52,2.6,2.7,2.8,2.9 or 3;The sand preferably conforms to continuous grading.In the present invention, institute It is 400~600 parts by weight to state the content of sand in the feed, concretely 405 parts by weight, 410 parts by weight, 415 parts by weight, 420 Parts by weight, 425 parts by weight, 430 parts by weight, 435 parts by weight, 440 parts by weight, 445 parts by weight, 450 parts by weight, 455 parts by weight, 460 parts by weight, 465 parts by weight, 470 parts by weight, 475 parts by weight, 480 parts by weight, 485 parts by weight, 490 parts by weight, 495 weight Part, 500 parts by weight, 505 parts by weight, 510 parts by weight, 515 parts by weight, 520 parts by weight, 525 parts by weight, 530 parts by weight, 535 Parts by weight, 540 parts by weight, 545 parts by weight, 550 parts by weight, 555 parts by weight, 560 parts by weight, 565 parts by weight, 570 parts by weight, 575 parts by weight, 580 parts by weight, 585 parts by weight, 590 parts by weight, 595 parts by weight or 600 parts by weight.
In the present invention, the specific surface area of the slag powders is preferably 300~500m2/ kg, concretely 320m2/kg、 340m2/kg、360m2/kg、380m2/kg、400m2/kg、420m2/kg、440m2/kg、460m2/kg、480m2/ kg or 500m2/ kg;The density of the slag powders is 2~3g/cm3, concretely 2.1g/cm3、2.2g/cm3、2.3g/cm3、2.4g/cm3、 2.5g/cm3、2.6g/cm3、2.7g/cm3、2.8g/cm3、2.9g/cm3Or 3g/cm3;The loss on ignitions of the slag powders preferably≤ 3%;The slag powders preferably conform to national standard《Mineral admixture for high-strength high-performance concrete》GB/T 18736-2002's It is required that.In the present invention, the content of the slag powders in the feed is 100~500 parts by weight, concretely 100 parts by weight, 150 parts by weight, 200 parts by weight, 250 parts by weight, 260 parts by weight, 270 parts by weight, 280 parts by weight, 290 parts by weight, 300 weight Part, 310 parts by weight, 320 parts by weight, 330 parts by weight, 340 parts by weight, 350 parts by weight, 360 parts by weight, 370 parts by weight, 375 Parts by weight, 380 parts by weight, 390 parts by weight, 400 parts by weight, 450 parts by weight or 500 parts by weight.In the present invention, slag powders have There is higher lateral reactivity, the mechanical property of concrete can be improved, its gelation activity is higher than flyash.
In the present invention, the flyash is recovered in caused industrial dust after coal burning obtains;It is described The fineness of flyash is preferably 400~1000 mesh, concretely 400 mesh, 450 mesh, 500 mesh, 550 mesh, 600 mesh, 650 mesh, 700 Mesh, 750 mesh, 800 mesh, 850 mesh, 900 mesh or 950 mesh;The specific surface area of the flyash is preferably 500~700m2/ kg, tool Body can be 520m2/kg、540m2/kg、560m2/kg、580m2/kg、600m2/kg、620m2/kg、640m2/kg、660m2/kg、 680m2/ kg or 700m2/kg;The density of the flyash is 2~3g/cm3, concretely 2.1g/cm3、2.2g/cm3、2.3g/ cm3、2.34g/cm3、2.4g/cm3、2.5g/cm3、2.6g/cm3、2.7g/cm3、2.8g/cm3、2.9g/cm3Or 3g/cm3;It is described The loss on ignition of flyash preferably≤3%, more preferably≤2.34%;The flyash preferably conforms to national standard《High-strength and high performance Concrete mineral additive》GB/T18736-2002 requirement.In the preferred technical solution of the present invention, the powder of small particle is selected Coal ash, it can play and fill closely knit effect, can also improve homogeneous, the compactness of concrete.In the present invention, the flyash exists Content in raw material is 100~500 parts by weight, concretely 100 parts by weight, 105 parts by weight, 110 parts by weight, 115 parts by weight, 120 parts by weight, 125 parts by weight, 130 parts by weight, 135 parts by weight, 140 parts by weight, 145 parts by weight, 150 parts by weight, 160 weight Part, 167 parts by weight, 170 parts by weight, 200 parts by weight, 250 parts by weight, 300 parts by weight, 350 parts by weight, 400 parts by weight, 450 Parts by weight or 500 parts by weight.
In the present invention, the alkali metal hydroxide is sodium hydroxide and/or potassium hydroxide;The alkali metal hydroxide The content of thing in the feed is 15~25 parts by weight, concretely 15 parts by weight, 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 Parts by weight, 20 parts by weight, 21 parts by weight, 22 parts by weight, 23 parts by weight, 24 parts by weight or 25 parts by weight.
In the present invention, the alkali silicate is sodium metasilicate and/or potassium silicate;The alkali silicate is in raw material In content be 60~75 parts by weight, concretely 60 parts by weight, 61 parts by weight, 62 parts by weight, 63 parts by weight, 64 parts by weight, 65 parts by weight, 66 parts by weight, 67 parts by weight, 68 parts by weight, 69 parts by weight, 70 parts by weight, 71 parts by weight, 72 parts by weight, 73 weights Measure part, 74 parts by weight or 75 parts by weight.
In the present invention, the content of the water in the feed is 240~260 parts by weight, concretely 240 parts by weight, 241 Parts by weight, 242 parts by weight, 243 parts by weight, 244 parts by weight, 245 parts by weight, 246 parts by weight, 247 parts by weight, 248 parts by weight, 249 parts by weight, 250 parts by weight, 251 parts by weight, 252 parts by weight, 253 parts by weight, 254 parts by weight, 255 parts by weight, 256 weight Part, 257 parts by weight, 258 parts by weight, 259 parts by weight or 260 parts by weight.
In one embodiment provided by the invention, the part water in raw material is first golden with alkali metal hydroxide and alkali respectively Belong to silicate composition alkali metal hydroxide aqueous solution and alkali metal silicate aqueous solution, the group of the water of surplus separately as raw material Point.Wherein, the water content of the alkali metal hydroxide aqueous solution is preferably 70~80wt%, concretely 71wt%, 72wt%, 73wt%, 74wt%, 74.9wt%, 75wt%, 76wt%, 77wt%, 78wt%, 79wt% or 80wt%;It is described The content of alkali metal hydroxide aqueous solution in the feed is preferably 75~80 parts by weight, concretely 75 parts by weight, 76 weight Part, 77 parts by weight, 77.5 parts by weight, 78 parts by weight, 78.5 parts by weight, 79 parts by weight or 80 parts by weight;The alkali metal silicate The water content of saline solution is preferably 60~70wt%, concretely 60wt%, 61wt%, 62wt%, 63wt%, 64wt%, 65wt%, 66wt%, 67wt%, 68wt%, 69wt% or 70wt%;The alkali metal silicate aqueous solution containing in the feed Amount is preferably 190~200 parts by weight, concretely 190 parts by weight, 191 parts by weight, 192 parts by weight, 193 parts by weight, 193.8 Parts by weight, 194 parts by weight, 195 parts by weight, 196 parts by weight, 197 parts by weight, 198 parts by weight, 199 parts by weight or 200 weight Part;The content of the water of the surplus in the feed is preferably 62~74 parts by weight, concretely 62 parts by weight, 63 parts by weight, 64 Parts by weight, 65 parts by weight, 66 parts by weight, 67 parts by weight, 68 parts by weight, 69 parts by weight, 69.3 parts by weight, 70 parts by weight, 71 weights Measure part, 72 parts by weight, 73 parts by weight, 73.5 parts by weight or 74 parts by weight.
In the present invention, the preferred sugar calcium of the retardation water reducing agent;The pH of the retardation water reducing agent is preferably 11~13, specifically Can be 12;The water-reducing rate of the retardation water reducing agent is preferably 5~10%, and concretely 8%;The air content of the retardation water reducing agent Preferably 2~4%, concretely 2.9%;The shrinkage ratio of the retardation water reducing agent is preferably≤100%.In the present invention, delay The content of solidifying water reducer in the feed is 5~10 parts by weight, concretely 5 parts by weight, 5.5 parts by weight, 6 parts by weight, 6.5 weight Part, 7 parts by weight, 7.5 parts by weight, 8 parts by weight, 8.5 parts by weight, 9 parts by weight, 9.5 parts by weight or 10 parts by weight.
Present invention also offers a kind of preparation method of regeneration concrete described in above-mentioned technical proposal, comprise the following steps:
A), regeneration rubble, sand, slag powders, flyash, alkali metal hydroxide, alkali silicate, water and slow setting are subtracted Aqua mixes, and obtains concrete slurry;
B), the concrete slurry obtains regeneration concrete by solidification and maintenance.
In preparation method provided by the invention, each raw material components are mixed with concrete slurry, detailed process first Including:
A1), partial moisture is not mixed with alkali metal hydroxide and alkali silicate, respectively obtains alkali metal hydrogen-oxygen The compound aqueous solution and alkali metal silicate aqueous solution;
A2), the water for regenerating rubble and surplus is mixed, obtains the first compound;
A3), first mixture is mixed with slag powders, flyash and sand, obtains the second compound;
A4), the second compound, alkali metal hydroxide aqueous solution, alkali metal silicate aqueous solution and the slow setting are subtracted Aqua mixes, and obtains concrete slurry.
In the preparation method of above-mentioned concrete slurry provided by the invention, step a2) in, the mode of mixing is preferably to stir Mix, the time of mixing is preferably 2~10min, more preferably 5min;Step a3) in, the mode of mixing is preferably to stir, mixing Time be preferably 2~10min, more preferably 5min;Step a4) in, alkali metal hydroxide aqueous solution, alkali silicate The mass ratio of the aqueous solution is preferably 1:2.5;The mode of mixing is preferably to stir, and the time of mixing is preferably 0.5~5min, more excellent Elect 2min as.
After obtaining concrete slurry, the concrete slurry is solidified and conserved, obtains regeneration concrete material. In one embodiment provided by the invention, concrete slurry can be solidified and be conserved in such a way:
Concrete slurry is poured into mold and vibration compacting, is covered within first day, is rewatered onto plastic foil with plastic foil, one It preferably pours water twice;Form removal in second day, concrete sample is put into high-temperature steam rapid curing case after having torn mould open, maintenance temperature Preferably 75~85 DEG C, more preferably 80 DEG C of degree;Curing time is preferably 12~36h, more preferably 24h;Treat high temperature steam curing After the completion of, concrete sample is taken out from high-temperature steam rapid curing case and is put on the ground, watering to concrete sample surface and Ground, then plastic foil is covered, water afterwards onto plastic foil, preferred watering daily twice, is conserved to seeking time is wanted, preferably conserved To the 7th day.
Regeneration concrete provided by the invention and preparation method thereof has the advantages that:
The slag powders that the present invention uses have lateral reactivity, can improve the intensity of concrete, there is micro-aggregate, suppress The contraction of concrete, slag powders not only contribute to hydration as the independent component of concrete and improve compactness, and Porosity can also be lowered, improve pore structure, so as to improve the anti-permeability performance of maturing.
The flyash that the present invention uses is recovered in caused industrial dust after coal burning to be obtained, and source is wide It is general, there is extremely strong Pozzolanic feature energy, calcium silicate compound (C-S-H) gel can be quickly generated with aqueous slkali hydration reaction, is carried The mechanical property of high concrete, such as resistance to compression, rupture strength.There is good acid-resistant corrosion and durability, low-shrinkage simultaneously And low-permeability, there is good volume stability during hardening and use is condensed.
The silicic acid that the sodium hydrate aqueous solution and mass concentration for being 25.1% present invention preferably uses mass concentration are 35% Sodium solution is according to mass ratio 1:2.5 it is well mixed after be used as alkali-activator, in this concentration and under matching, alkali-activator can be very Good activated slag powder and the activity of flyash, improve the performance of the concrete of preparation.
The present invention is made to regenerate rubble and sand as aggregate with industry byproducts such as slag powders and flyash after alkali-activated carbonatite For binder materials binding agent, a kind of environmental protection is obtained while there is the concrete material of excellent performance.The concrete material Preparation technology is simple, not only realizes effective recycling of abandoned building and trade waste, also with setting time it is fast, The advantages that early strength is high, be advantageous to be applied in rescue and relief work and national defense construction.In addition, regeneration provided by the invention Concrete material also has good acid-alkali-corrosive-resisting and durability, low-shrinkage and low-permeability.
Test result indicates that 7 days compression strength of regeneration concrete provided by the invention is more than 55MPa, presetting period 17 ~28min, final setting time are 38~53min.
For the sake of becoming apparent from, it is described in detail below by following examples.
It is specific as follows to be related to material in the embodiment of the present invention and comparative example:
Regenerate rubble to produce using Shenzhen Lvfa Pengcheng Environmental Science and Technology Co., Ltd., respectively particle diameter is between 5~10mm With 10~20mm regeneration rubble, mass ratio 1:1, meet continuous grading, apparent density 2519kg/m3, bulk density 1187kg/ m3, water absorption rate 6%, crush index 17.5%, debris such as glass, wood chip, fragment of brick etc. are removed, after being cleaned with clear water, is dried in the air naturally It is dry stand-by;
Natural coarse aggregate uses granite stones, respectively particle diameter between 5~10mm and 10~20mm natural coarse aggregate, Mass ratio 1:1, meet continuous grading;
River sand uses the natural fine aggregate of continuous grading, proportion 2.69, modulus of fineness 2.52;
Slag powders are produced using Guangdong Basic New Century Concrete Co., Ltd., specific surface area 400m2/ kg, density 2.8g/cm3, loss on ignition is no more than 3%;
Flyash is produced using power plant of Gongyi City two, specific surface area 600m2/ kg, density 2.34g/cm3, loss on ignition is little In 3%, the mesh of fineness 600;
Cement uses stone well board Portland cement, strength grade 42.5R;
NaOH solution uses 99% purity white gill shape solid of Botian Chemical Co., Ltd. Tianjin's production, passes through Titration is formulated, and its substance withdrawl syndrome is 8mol/L, density 1.275g/cm3, sodium hydroxide mass percentage concentration is 25.1%, aqueous mass percentage concentration is 74.9%;
Na2SiO3Solution is produced using Foshan City South Sea Ke Ning Chemical Co., Ltd.s, modulus 3.34, density 1.387g/ cm3, sodium oxide content 7.3%, dioxide-containing silica 27.6%, aqueous mass percentage concentration is 65%;
Retardation water reducing agent is produced using Sichuan Province Miyi Hua Sen sugar industries Co., Ltd, and its outward appearance is brownish-yellow powder, PH value 12, water-reducing rate 8%, air content 2.9%, shrinkage ratio≤110%.
Embodiment 1
The regeneration rubble of particle diameter 5~10mm and 10~20mm continuous grading is added in forced mixer (in mass ratio 1:1 mixing) 1155kg, additional water 69.3kg, mixing time is 5 minutes;Add slag powders 375kg, flyash 125kg, river sand 495kg, mixing time are 5 minutes;Add sodium hydroxide solution 77.51kg, sodium silicate solution 193.77kg, retardation water reducing agent 7.5kg, mixing time are 2 minutes, obtain concrete slurry 1.
Slurry is poured into standard mold and vibration compacting, ground watering in first day, the mould for being filled with concrete slurry is placed on ground On, covered, rewatered onto plastic foil with plastic foil, pour water twice within one day;Form removal in second day, tear open after mould immediately by concrete Test specimen is put into high-temperature steam rapid curing case, 80 DEG C of curing temperature, curing time 24h;, will after the completion for the treatment of high temperature steam curing Concrete sample takes out from high-temperature steam rapid curing case and is put on the ground, and directly concrete sample surface and ground are arrived in watering afterwards Face, then plastic foil is covered, water onto plastic foil, watering daily twice, conserves to the 7th day, obtains 150mm*150mm*150mm Slag-fly ash base geological polymer regeneration concrete test specimen.
Embodiment 2
The regeneration rubble of particle diameter 5~10mm and 10~20mm continuous grading is added in forced mixer (in mass ratio 1:1 mixing) 1225kg, additional water 73.5kg, mixing time is 5 minutes;Add slag powders 300kg, flyash 100kg, river sand 525kg, mixing time are 5 minutes;Add sodium hydroxide solution 77.51kg, sodium silicate solution 193.77kg, retardation water reducing agent 6kg, mixing time are 2 minutes, obtain concrete slurry 2.Maintenance process obtains 150mm*150mm*150mm with reference to embodiment 1 Slag-fly ash base geological polymer regeneration concrete test specimen.
Embodiment 3
The regeneration rubble of particle diameter 5~10mm and 10~20mm continuous grading is added in forced mixer (in mass ratio 1:1 mixing) 1038kg, additional water 62.3kg, mixing time is 5 minutes;Add slag powders 500kg, flyash 167kg, river sand 445kg, mixing time are 5 minutes;Add sodium hydroxide solution 77.51kg, sodium silicate solution 193.77kg, retardation water reducing agent 10kg, mixing time are 2 minutes, obtain concrete slurry 3.Maintenance process obtains 150mm*150mm* with reference to embodiment 1 150mm slag-fly ash base geological polymer regeneration concrete test specimen.
Comparative example 1
According to conventional concrete preparation method prepare reference examples 1, specifically in forced mixer add particle diameter 5~ 10mm and the regeneration rubble of 10~20mm continuous gradings (in mass ratio 1:1 mixing) 1155kg, additional water 69.3kg, mixing time For 5 minutes;Cement 500kg, river sand 495kg are added, mixing time is 5 minutes;Water 184kg, retardation water reducing agent 7.5kg are added, Mixing time is 2 minutes, obtains contrasting concrete slurry 1.Maintenance process obtains 150mm*150mm*150mm with reference to embodiment 1 Contrast concrete sample.
Comparative example 2
According to conventional concrete preparation method prepare reference examples 2, specifically in forced mixer add particle diameter 5~ The natural coarse aggregate of 10mm and 10~20mm continuous gradings (in mass ratio 1:1 mixing) 1155kg, additional water 69.3kg, during stirring Between be 5 minutes;Cement 500kg, river sand 495kg are added, mixing time is 5 minutes;Add water 184kg, retardation water reducing agent 7.5kg, mixing time are 2 minutes, obtain contrasting concrete slurry 2.Maintenance process obtains 150mm* with reference to embodiment 1 150mm*150mm contrast concrete sample.
Performance test
For ease of more different embodiments and the raw material dosage difference of comparative example, the raw material of each embodiment and comparative example is used Amount is summarized in Tables 1 and 2 respectively:
The embodiment raw material dosage table of table 1
The comparative example raw material dosage table of table 2
Note:1st, additional water is considers the characteristics of regenerated coarse aggregate water absorption rate is larger, to make the water-cement ratio of concrete keep not Become, it is extra to increase to regenerate the 6% of rubble quality calculated additional water;
2nd, Free water=NaOH solution quality × aqueous percentage concentration 74.9%+Na2SiO3Solution quality × aqueous percentage is dense Degree 65%;
3rd, water-cement ratio=Free water/slag micropowder+flyash.
The test specimen obtained to embodiment and comparative example carries out performance test, the slump, setting time, compression strength Energy method of testing and instrument are respectively in strict accordance with GB/T-50080《Standard for test methods of properties of ordinary concrete mixture》、GB/T- 50081《Normal concrete mechanical test method》Perform, data are as shown in table 3:
The performance test results of table 3
Sample The slump (mm) Compression strength (MPa) Presetting period Final setting time
Embodiment 1 210 67.4 21min 44min
Embodiment 2 130 55.3 28min 53min
Embodiment 3 110 74.1 17min 38min
Reference examples 1 153 23.7 8h25min 10h40min
Reference examples 2 166 34.2 8h45min 10h50min
It is mixed that the slag-fly ash base geological polymer regeneration of the invention being prepared is can be seen that from above-mentioned experimental result Solidifying soil, the slump is 110~210mm, belongs to liquid concrete or Cracking of High Flowing Concrete, favorable working performance, is easy to reality The construction technology operation such as pour, vibrate, wiping one's face in engineer applied.7d compression strength is 55.3~74.1MPa, is mixed more than C55 Native strength grade is coagulated, there is higher early strength.Presetting period is 17~28min, and final setting time is 38~53min, is had Faster setting time, its performance indications meet the technical performance index of concrete.
By embodiment 1, embodiment 2, embodiment 3 and reference examples 1, the comparison of reference examples 2, slag of the invention- Fly ash base geo-polymer recycled concrete is compared with the primary aggregate concrete of Portland cement and Portland cement again Raw aggregate concrete strength improves 62%~213%, and the presetting period accelerates 17~30 times, and final setting time accelerates 11~16 times.Tool Have the advantages that early strength is high, setting time is fast, be advantageous to be applied in rescue and relief work and national defense construction.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should It is considered as protection scope of the present invention.

Claims (10)

1. a kind of regeneration concrete, it is made up of the raw material including following parts by weight:
2. regeneration concrete according to claim 1, it is characterised in that the regeneration rubble includes 5~10mm's of particle diameter Regenerate 10~20mm of rubble and particle diameter regeneration rubble.
3. regeneration concrete according to claim 2, it is characterised in that the regeneration rubble and grain of the 5~10mm of particle diameter The mass ratio of 10~20mm of footpath regeneration rubble is 1:(0.5~2).
4. regeneration concrete according to claim 1, it is characterised in that the apparent density of the regeneration rubble for 2000~ 3000kg/m3;The bulk density of the regeneration rubble is 1000~1200kg/m3;The water absorption rate of the regeneration rubble for 4~ 8%;The crush index of the regeneration rubble is 15~20%.
5. regeneration concrete according to claim 1, it is characterised in that the proportion of the sand is 2~3;The sand it is thin It is 2~3 to spend modulus.
6. regeneration concrete according to claim 1, it is characterised in that the specific surface area of the slag powders be 300~ 500m2/kg;The density of the slag powders is 2~3g/cm3
7. regeneration concrete according to claim 1, it is characterised in that the specific surface area of the flyash be 500~ 700m2/kg;The density of the flyash is 2~3g/cm3
8. according to the regeneration concrete described in any one of claim 1~7, it is characterised in that in terms of parts by weight, the raw material Including following components:
The water content of the sodium hydrate aqueous solution is 70~80wt%;The water content of the sodium silicate aqueous solution be 60~ 70wt%.
9. the preparation method of regeneration concrete, comprises the following steps described in a kind of claim 1:
A), will regeneration rubble, sand, slag powders, flyash, alkali metal hydroxide, alkali silicate, water and retardation water reducing agent Mixing, obtains concrete slurry;
B), the concrete slurry obtains regeneration concrete by solidification and maintenance.
10. preparation method according to claim 9, it is characterised in that the step a) is specifically included:
A1), partial moisture is not mixed with alkali metal hydroxide and alkali silicate, respectively obtains alkali metal hydroxide The aqueous solution and alkali metal silicate aqueous solution;
A2), the water for regenerating rubble and surplus is mixed, obtains the first compound;
A3), first mixture is mixed with slag powders, flyash and sand, obtains the second compound;
A4), by the second compound, alkali metal hydroxide aqueous solution, alkali metal silicate aqueous solution and the retardation water reducing agent Mixing, obtains concrete slurry.
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CN109608080A (en) * 2019-01-28 2019-04-12 广东工业大学 A kind of high-performance activity excitant and a kind of concrete for green gel material
CN109942235A (en) * 2019-03-20 2019-06-28 天津大学 Room temperature conserves ground polymers concrete of high-strength high anti-carbonation properties and preparation method thereof
CN110395963A (en) * 2019-08-16 2019-11-01 北京市高强混凝土有限责任公司 A kind of construction refuse regenerated concrete
CN111205005A (en) * 2020-03-06 2020-05-29 交通运输部公路科学研究所 Cementing material, application and concrete
CN111362631A (en) * 2020-04-09 2020-07-03 华电国际电力股份有限公司朔州热电分公司 Full-solid waste type alkali-activated concrete and preparation method thereof
US10800703B1 (en) * 2018-10-26 2020-10-13 The United States Of America As Represented By The Secretary Of The Air Force Cementitious material
CN112479674A (en) * 2020-11-23 2021-03-12 湖南大学 Alkali-activated recycled red brick micro powder and slag-based recycled concrete and preparation method thereof
CN113754357A (en) * 2021-10-21 2021-12-07 福建农林大学 High-strength geopolymer recycled aggregate concrete load-bearing structural material

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CN101570426A (en) * 2009-04-21 2009-11-04 同济大学 Geo-polymer recycled concrete and preparation method thereof
CN103601424A (en) * 2013-11-11 2014-02-26 长沙理工大学 Geopolymeric concrete based on recycled aggregate and preparation method of geopolymeric concrete
CN106145809A (en) * 2015-04-07 2016-11-23 五冶集团上海有限公司 A kind of C70 high-strength concrete and preparation method thereof

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CN101570426A (en) * 2009-04-21 2009-11-04 同济大学 Geo-polymer recycled concrete and preparation method thereof
CN103601424A (en) * 2013-11-11 2014-02-26 长沙理工大学 Geopolymeric concrete based on recycled aggregate and preparation method of geopolymeric concrete
CN106145809A (en) * 2015-04-07 2016-11-23 五冶集团上海有限公司 A kind of C70 high-strength concrete and preparation method thereof

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10800703B1 (en) * 2018-10-26 2020-10-13 The United States Of America As Represented By The Secretary Of The Air Force Cementitious material
CN109608080A (en) * 2019-01-28 2019-04-12 广东工业大学 A kind of high-performance activity excitant and a kind of concrete for green gel material
CN109942235A (en) * 2019-03-20 2019-06-28 天津大学 Room temperature conserves ground polymers concrete of high-strength high anti-carbonation properties and preparation method thereof
CN109942235B (en) * 2019-03-20 2021-08-03 天津大学 Normal-temperature curing geopolymer concrete with high strength and high anti-carbonization performance and preparation method thereof
CN110395963A (en) * 2019-08-16 2019-11-01 北京市高强混凝土有限责任公司 A kind of construction refuse regenerated concrete
CN111205005A (en) * 2020-03-06 2020-05-29 交通运输部公路科学研究所 Cementing material, application and concrete
CN111362631A (en) * 2020-04-09 2020-07-03 华电国际电力股份有限公司朔州热电分公司 Full-solid waste type alkali-activated concrete and preparation method thereof
CN112479674A (en) * 2020-11-23 2021-03-12 湖南大学 Alkali-activated recycled red brick micro powder and slag-based recycled concrete and preparation method thereof
CN113754357A (en) * 2021-10-21 2021-12-07 福建农林大学 High-strength geopolymer recycled aggregate concrete load-bearing structural material

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Application publication date: 20180309