CN103553503A - Preparation method of C50 recycled concrete of low gelling material - Google Patents
Preparation method of C50 recycled concrete of low gelling material Download PDFInfo
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- CN103553503A CN103553503A CN201310556552.6A CN201310556552A CN103553503A CN 103553503 A CN103553503 A CN 103553503A CN 201310556552 A CN201310556552 A CN 201310556552A CN 103553503 A CN103553503 A CN 103553503A
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- 239000004567 concrete Substances 0.000 title claims abstract description 101
- 239000000463 material Substances 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims description 15
- 239000004568 cement Substances 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000004576 sand Substances 0.000 claims abstract description 26
- 238000003756 stirring Methods 0.000 claims abstract description 15
- 229920005646 polycarboxylate Polymers 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims abstract description 6
- 239000000446 fuel Substances 0.000 claims abstract description 5
- 239000012747 synergistic agent Substances 0.000 claims description 22
- 239000002699 waste material Substances 0.000 claims description 19
- 239000010881 fly ash Substances 0.000 claims description 18
- 230000008929 regeneration Effects 0.000 claims description 14
- 238000011069 regeneration method Methods 0.000 claims description 14
- 238000006062 fragmentation reaction Methods 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 12
- 239000002893 slag Substances 0.000 claims description 12
- 239000003638 chemical reducing agent Substances 0.000 claims description 9
- 238000013467 fragmentation Methods 0.000 claims description 9
- 238000000227 grinding Methods 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 9
- 238000005516 engineering process Methods 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 239000007858 starting material Substances 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- -1 admixture Substances 0.000 claims description 2
- 239000011449 brick Substances 0.000 claims description 2
- 239000004744 fabric Substances 0.000 claims description 2
- 239000008187 granular material Substances 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 238000013021 overheating Methods 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 230000003014 reinforcing effect Effects 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 238000007599 discharging Methods 0.000 abstract description 4
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- 239000010883 coal ash Substances 0.000 abstract 2
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract 2
- 239000011707 mineral Substances 0.000 abstract 2
- 239000008030 superplasticizer Substances 0.000 abstract 2
- 239000011280 coal tar Substances 0.000 abstract 1
- 238000002156 mixing Methods 0.000 description 15
- 238000012360 testing method Methods 0.000 description 15
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- 238000001354 calcination Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 235000011194 food seasoning agent Nutrition 0.000 description 2
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 2
- 229910052683 pyrite Inorganic materials 0.000 description 2
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- 238000005406 washing Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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Abstract
The invention relates to C50 recycled concrete of a low gelling material. The C50 recycled concrete comprises the following components: cement, reclaimed sand, coarse aggregate, coal ash, levigated mineral powder, additive (a polycarboxylate superplasticizer and a synergist CTF (Coal Tar Fuel)) and water in a ratio of 1:2.15:3.51:0.18:0.33:0.04:0.50, wherein the additive is mixed in a ratio of the polycarboxylate superplasticizer to the CTF synergist of 4:1 (mass ratio). The coarse aggregate as well as the reclaimed sand and 1/3 of the water is firstly added for stirring for 10 seconds, and then, the cement, the coal ash, the levigated mineral powder, the rest 2/3 of the water as well as the additive are added. And the stirring time from adding the coarse aggregate and the reclaimed sand to discharging the concrete is 90 seconds-120 seconds.
Description
[technical field]
The present invention relates to high grade C50 regeneration concrete, be specifically related to a kind of synergistic agent CTF preparation, C50 concrete that in raw material, fine aggregate is reclaimed sand and preparation method thereof.
[background technology]
Concrete is indispensable important engineering materials in modern civil construction project.Along with the development of urban construction, reconstruction of the old city town and the building waste that produces is increasing, and the method for processing at present a large amount of building wastes is to bury hole or air storage, not only occupies cultivated land, contaminate environment, and caused the wasting of resources.The concrete strength of high grade is had relatively high expectations; therefore when carrying out mix-design can with more gelling material particularly cement consumption ensure the quality of products; and cement clinker is to obtain as Wingdale, clay, pyrite etc. by calcining natural or artificial ground; not only expense is high to produce like this concrete of high grade, nor can carry out, country relevantly economizes on resources, the techno-economic policy of protection of the environment.
[summary of the invention]
The object of the invention is to a kind of synergistic agent CTF to be advantageously applied in regeneration concrete production, can be in the situation that the proportioning of low cement amount and admixture reclaimed sand still can meet the intensity of C50 high-grade concrete, so both realized the recycling of building waste, also reduce the consumption of cement in concrete simultaneously, thereby solved consumption of natural resource, drawback that cost is high.
Another object of the present invention is to provide the preparation method that strength grade that reclaimed sand is fine aggregate is C50 regeneration concrete of take with this synergistic agent CTF configuration.CTF concrete synergistic agent Main Function is, in the situation that the consumption 10～15% of cement in reducing concrete, can not only keep or promote concrete strength and weather resistance, and can also improve fresh concrete serviceability, solving concrete admixture and cross problems such as mixing risk, is the energy-saving environmental protection product of a kind of high-tech.
C50 concrete of the present invention comprises its content of following composition and calculates by cement weight ratio.
1 parts by weight of cement.
0.18 weight part flyash.
0.33 weight part ground blast furnace slag.
2.15 weight part reclaimed sand.
3.51 weight part coarse aggregate.
0.50 weight part tap water.
0.04 weight part admixture (polycarboxylate water-reducer+CTF synergistic agent, additional proportion is 4:1 by quality ratio).
According to mix calculation book of the present invention, see attached list one
According to cement of the present invention, be that bulk cement is main, preferred P.O42.5 cement.
According to flyash of the present invention, be II level flyash.
According to ground blast furnace slag of the present invention, it is S95 level ground blast furnace slag
According to reclaimed sand of the present invention for particle diameter≤5mm fineness modulus that building waste is obtained through screening after fragmentation is again 2.8, powder content 2.5%, clod content 0.8%, apparent density 2640Kg/m
3.
According to coarse aggregate of the present invention, be continuous grading, silt content 0.7%, clod content 0.2%, crush index 6.5%, the apparent density 2650Kg/m of particle diameter 5-25mm
3, faller gill shape granule content 5.6% stone.
The preparation technology of reclaimed sand: discarded concrete is transported in load hopper, with jaw crusher, building waste is carried out to one-level fragmentation, and reinforcing bar is separated with concrete, adopt mechanical system by the plastics in building waste after one-level fragmentation, cloth, the foreign material such as brick and tile are rejected, with jaw crusher by the building waste after one-level fragmentation again broken (two-stage crushing) become to be less than 200mm block, and then send into the block that (three grades of fragmentations) in eccentrically weighted shaft formula crusher becomes ﹤ 50mm, with electromagnetic deironing machine, the metallics in building waste after three grades of fragmentations is rejected, block after rejecting metal is sent in vertical liquid fuel stove and heat-treated, vertical liquid fuel stove is calcined block at 300 ℃, remove moisture, reduce its water ratio.Discarded concrete after Overheating Treatment is sent into axle horizontal type list storekeeper grinding machine, and grinding machine is the horizontal axis revolution steel cage that will have certain size gap, with sieve apparatus, the building waste after one-level grinding is sieved, the vibratory screening apparatus that is 5mm with mesh size, the coarse aggregate that particle diameter is more than or equal to 5mm sifts out, by rotary conveyor, directly deliver to special-purpose feed bin, the sand-cement slurry that particle diameter is less than to 5mm is transported to horizontal axis wind and sweeps and in tuber grinder, carry out secondary grinding, and attention will install in tuber grinder that material is kicked up, flow control device additional.Finally with bag filter, levigate hardened cement paste powder is collected, sent into feed bin and be in store for.
According to admixture one of the present invention, be high-efficiency water-reducing agent of poly-carboxylic acid, admixture two is the synergistic agent CTF of Guangzhou San Jun building materials Science and Technology Ltd..
The present invention uses the C50 preparation method of concrete of synergistic agent CTF preparation to comprise:
1, by proportioning, take starting material
2, the water that first drops into coarse aggregate and reclaimed sand and 1/3 stirred after 10 seconds, then the water and the admixture that drop into cement, flyash, breeze, residue 2/3 continue to stir until evenly go out machine.
3, churning time drops into stirrer to concrete from coarse aggregate and reclaimed sand to go out the machine time is 90-120 second.
4, concrete goes out after machine by the regulation of national standard method GB/T50080-2002 < < Standard for test methods of properties of ordinary concrete mixture standard > >, fresh concrete to be carried out respectively to fillibility to test its result be divergence 600-700mm, expansion time 4.5s-5.0s; Trafficability characteristic its test result in gap is 35mm; Its test result of education resistance is 18%, and stability test result is 8%.Its test result is good, meets the desired properties data target of C50 concrete.
5, concrete is 245mm going out machine by slump test in 30 minutes, and divergence is 650-670mm; Through slump test in 60 minutes, be 240mm, divergence is 630-650mm.
6, the concrete mixing and stirring is moulding in 15min after mixing, the concrete mix that mixing is good is mixed three times more back and forth with spade, not stratifiedly once pack die trial into, when filling with substance plugs and pounds along each die trial wall with spatula, and make concrete mix exceed die trial mouth, during concrete formation, use shaking table to vibrate general 10 to 20 seconds aftershapings.Strike off die trial unnecessary concrete suitable for reading floating with spatula.Put into concrete curing box and carry out maintenance.24 as a child form removals, after form removal, test block is moved to concrete mark support between in carry out maintenance (mark support between 20 ± 2 ℃ of temperature, humidity >=95%), in the age of concrete, reach 3 days, concrete test block taken out 7 days, 28 days time, the method that adopts < < GB/T50081-2002 standard for test methods of mechanical properties of ordinary concrete > > to provide is carried out intensity detection to test block, and its intensity is respectively 35.5Mp, 49.8Mp, its intensity level of 63.5Mp meets design strength.
The present invention, by adding synergistic agent CTF in the regeneration mortar of low gelling material, can be met the concrete intensity of common C50 after stirring, and has following beneficial effect:
1, reduce cost
Add after synergistic agent CTF its gelling material especially the consumption of cement reduced, this will make concrete cost greatly reduce.
2, save natural materials resource
The feature of maximum of the present invention is exactly to save on the one hand the consumption of cement, realizes on the other hand the refuse reclamation of building waste.Because cement is obtained as Wingdale, clay, pyrite etc. by the natural stone ore of calcining, these natural resource can have been exploited one day, so the interpolation of synergistic agent CTF can be saved the exploitation of these natural resource greatly.In addition, it is natural sand that conventional concrete is produced fine aggregate used, belongs to Nonrenewable resources, the pollution problem that had so both solved building waste, broken away from again the dependency of concrete production to natural sand, this has also carried out and nationally relevant has economized on resources, the techno-economic policy of low-carbon environment-friendly.
3, have wide range of applications
C50 concrete is widely used in most of engineering, and mostly as the significant points of engineering, this invention is again that CTF synergistic agent has been applied in regeneration concrete, has shown good compatibility, and therefore this synergistic agent has application space very widely.
[accompanying drawing explanation]
Accompanying drawing 1 is for preparing the process flow sheet of reclaimed sand.
Accompanying drawing 2 is for being used synergistic agent CTF to prepare the production technological process of C50 regeneration concrete.
[embodiment]
Below in conjunction with specific embodiment, the present invention will be further described.Should be understood that following examples are only for the present invention is described but not limit the scope of the invention.
In the context of the present invention, described cement adopts P.O42.5 cement; Flyash adopts II level flyash; Breeze adopts S95 level ground blast furnace slag; Admixture is high-efficiency water-reducing agent of poly-carboxylic acid and synergistic agent CTF; Reclaimed sand particle diameter≤5mm, coarse aggregate size is 5-25mm.
The preparation of the C50 regeneration concrete sample of embodiment 1, use synergistic agent CTF preparation
By the amount of 25 liters, every dish, with weight ratio 1 ︰ 2.15 ︰ 3.51 ︰ 0.18 ︰ 0.33 ︰ 0.04 ︰ 0.50, take respectively cement, reclaimed sand, coarse aggregate, flyash, ground blast furnace slag, admixture (polycarboxylate water-reducer and synergistic agent CTF), water.Wherein the mixed ratio of polycarboxylate water-reducer and synergistic agent CTF is 4:1.By the water that first drops into coarse aggregate and reclaimed sand and 1/3, stir after 10 seconds, then drop into water and the admixture of cement, flyash, breeze, residue 2/3.Stir 90-120 second.The concrete of mixing is moulding in 15min after mixing, and the concrete mix that mixing is good is mixed three times more back and forth with spade, not stratifiedly once packs die trial into, and when filling with substance plugs and pounds along each die trial wall with spatula, and makes concrete mix exceed die trial mouth.During concrete formation, use shaking table to vibrate general 10 to 20 seconds aftershapings.Strike off die trial unnecessary concrete suitable for reading floating with spatula.Put into concrete curing box and carry out maintenance.Form removal after 24 hours, after form removal, test block is moved to concrete mark support between in carry out maintenance, within 28 days, take out afterwards, the method that adopts < < GB/T50081-2002 standard for test methods of mechanical properties of ordinary concrete > > to provide is carried out intensity detection to test block, intensity reaches 63.5Mp and reaches design strength, meets the concrete strength grade of C50.
As shown in Figure 2, at stirring station, first the starting material that enter the station are carried out to Entrustment Inspection, concrete optimum, after a series of correlation step such as proportioning application, by rotary conveyor, worm conveyor, admixture pump, water pump is by cement, reclaimed sand, coarse aggregate, flyash, ground blast furnace slag, admixture (polycarboxylate water-reducer and synergistic agent CTF), after water is delivered to electronic weighing balance and measures, by the water that first drops into coarse-fine aggregate and 1/3, stir after 10 seconds again, drop into again cement, flyash, the water of residue 2/3 and admixture continue to stir until evenly go out machine, pack in concrete tank, be transported to working-yard.Wherein measuring raw materials permissible variation meets following table 1-1:
Table 1-1
Adopt concrete mixing and transporting car, concrete mixing and transporting car should be taked the measures such as sun-proof, cold-proof.Transport trolley is clean by concrete washing residual in car before connecting material, and car internal water accumulation is drained.In transportation, the rotation that remains a constant speed of the cylinder of transport mixer, speed should be controlled at 3r/min～5r/min, and forbids to Che Neijia water.Transport trolley should complete at 90min from the time that starts to connect material to discharging, as need extend the shipping time, can take corresponding effective technology measure to complete.Before discharging, transport vehicle tank body fast rotational 20s is above can discharging.
When concrete delivery is first checked concrete slump divergence and T50 expansion time to working-yard, observe concrete mix simultaneously whether outer bleeding and center aggregate packing phenomenon occur, after the assay was approved, can be through modes such as concrete tank self-unloading, concrete pump truck pumping, tower cranes by concrete placement to the required position of building, for two dimensional structure concrete members after having built, after initial set, before final set, with trowel, concrete surface is carried out to 3 times respectively and rolls, with the crackle that prevents that concrete from producing because of factors such as dehydration, drying shrinkage.Concrete strength reaches 1.2N/mm
2after, with gunnysack or straw bag, cover water seasoning, can water storing conservation during condition license or spraying curing agent carry out maintenance; After vertical structural member form removal, surface should cover and water seasoning with gunnysack or cotton-wadded quilt, also can the maintenance of brushing curing agent, and curing time is not less than 14 days, irrigation times is according to guaranteeing that concrete keeps moisture state to determine, when daily mean temperature must not water during lower than 5 ℃.
By the C50 regeneration concrete of above synergistic agent CTF preparation than the same label concrete of common preparation on cost every cubic metre can save cement 44kg, and fine aggregate used is that building waste is through fragmentation, the reclaimed sand that screening obtains, so both reduced the demand of cement, solved again the refuse reclamation of building waste, the policy that meets the low-carbon environment-friendly that country advocates, belongs to green energy resource project
Be significant and development prospect.
Comparative example
Comparative example 1(cement consumption improves, without synergistic agent CTF)
By the amount of 15 liters, every dish, with weight ratio 1 ︰ 1.83 ︰ 2.99 ︰ 0.17 ︰ 0.26 ︰ 0.04 ︰ 0.84, take respectively cement, reclaimed sand, coarse aggregate, flyash, ground blast furnace slag, polycarboxylate water-reducer, water.By the water that first drops into coarse-fine aggregate and 1/3, stir after 10 seconds, then the water and the admixture that drop into cement, flyash, breeze, residue 2/3 stir 90-120 second.The concrete of mixing is moulding in 15min after mixing, the concrete mix that mixing is good is mixed three times more back and forth with spade, not stratifiedly once pack die trial into, when filling with substance plugs and pounds along each die trial wall with spatula, and make concrete mix exceed die trial mouth, during concrete formation, at shaking table, vibrate moulding in 10 to 20 seconds.Strike off die trial unnecessary concrete suitable for reading floating with spatula, put into concrete curing box and carry out maintenance.24 as a child form removals, after form removal, test block is moved to concrete mark support between in carry out maintenance, within 28 days, take out afterwards, the method that adopts < < GB/T50081-2002 standard for test methods of mechanical properties of ordinary concrete > > to provide is carried out intensity detection to test block, intensity reaches 65.2Mp, reach design strength, but the concrete that this proportioning is mixed out is apparently higher than the consumption of embodiment 1 gelling material used, improved product cost, uneconomical material benefit.
The identical cement consumption of comparative example 2(, without synergistic agent CTF)
By the amount of 15 liters, every dish, with weight ratio 1 ︰ 2.15 ︰ 3.51 ︰ 0.18 ︰ 0.33 ︰ 0.04 ︰ 0.50, take respectively cement, reclaimed sand, coarse aggregate, flyash, ground blast furnace slag, polycarboxylate water-reducer, water.By the water that first drops into coarse-fine aggregate and 1/3, stir after 10 seconds, then the water and the admixture that drop into cement, flyash, breeze, residue 2/3 stir 90-120 second.The concrete of mixing is moulding in 15min after mixing, the concrete mix that mixing is good is mixed three times more back and forth with spade, not stratifiedly once pack die trial into, when filling with substance plugs and pounds along each die trial wall with spatula, and make concrete mix exceed die trial mouth, during concrete formation, at shaking table, vibrate moulding in 10 to 20 seconds.Strike off die trial unnecessary concrete suitable for reading floating with spatula, put into concrete curing box and carry out maintenance.24 as a child form removals, after form removal, test block is moved to concrete mark support between in carry out maintenance, within 28 days, take out afterwards, the method that adopts < < GB/T50081-2002 standard for test methods of mechanical properties of ordinary concrete > > to provide is carried out intensity detection to test block, intensity is 45.2Mp, does not reach design strength.
Table one
Claims (4)
1. the C50 regeneration concrete of a low gelling material, it is characterized in that raw material packet contains following composition, take weight ratio: cement, reclaimed sand, coarse aggregate, flyash, ground blast furnace slag, admixture, water ratio are 1 ︰ 2.15 ︰ 3.51 ︰ 0.18 ︰ 0.33 ︰ 0.04 ︰ 0.50; Wherein admixture is polycarboxylate water-reducer and synergistic agent CTF, and additional proportion is 4:1 by quality ratio.
2. regeneration concrete claimed in claim 1, it is characterized in that: described cement is P.O42.5 cement, flyash is II level flyash, ground blast furnace slag is S95 level ground blast furnace slag, reclaimed sand for particle diameter≤5mm fineness modulus that building waste is obtained through screening after fragmentation is again 2.8, powder content 2.5%, clod content 0.8%, apparent density 2640Kg/m
3; Coarse aggregate is continuous grading, silt content 0.7%, clod content 0.2%, crush index 6.5%, the apparent density 2650Kg/m of particle diameter 5-25mm
3, faller gill shape granule content 5.6% stone.
3. regeneration concrete claimed in claim 1, it is characterized in that: the preparation technology of reclaimed sand: discarded concrete is transported in load hopper, with jaw crusher, building waste is carried out to one-level fragmentation, and reinforcing bar is separated with concrete, adopt mechanical system by the plastics in building waste after one-level fragmentation, cloth, brick and tile foreign material are rejected, with jaw crusher by the building waste after one-level fragmentation again broken (two-stage crushing) become to be less than 200mm block, and then send in eccentrically weighted shaft formula crusher the block that broken (three grades of fragmentations) becomes ﹤ 50mm, with electromagnetic deironing machine, the metallics in building waste after three grades of fragmentations is rejected, block after rejecting metal is sent in vertical liquid fuel stove and heat-treated, vertical liquid fuel stove is calcined block at 300 ℃, remove moisture, reduce its water ratio, discarded concrete after Overheating Treatment is sent into axle horizontal type list storekeeper grinding machine, and grinding machine is the horizontal axis revolution steel cage that will have certain size gap, with sieve apparatus, the building waste after one-level grinding is sieved, the vibratory screening apparatus that is 5mm with mesh size, the coarse aggregate that particle diameter is more than or equal to 5mm sifts out, by rotary conveyor, directly deliver to special-purpose feed bin, the sand-cement slurry that particle diameter is less than to 5mm is transported to horizontal axis wind and sweeps and in tuber grinder, carry out secondary grinding, and attention will install in tuber grinder that material is kicked up, flow control device additional, finally the cement slurry powder after secondary grinding is collected with bag filter, sent into feed bin and be in store for.
4. the preparation method of regeneration concrete described in claim 1,2 or 3, comprising: by proportioning, take starting material; The water that first drops into coarse aggregate and reclaimed sand and 1/3 stirred after 10 seconds, then the water and the admixture that drop into cement, flyash, ground blast furnace slag, residue 2/3 continue to stir until evenly go out machine; Churning time drops into stirrer to concrete from coarse aggregate and reclaimed sand, and to go out the machine time be 90-120 second.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104058673A (en) * | 2014-07-04 | 2014-09-24 | 北京东方建宇混凝土科学技术研究院有限公司 | Lightweight aggregate concrete containing low-quality recycled aggregate and preparing method thereof |
| CN105367004A (en) * | 2015-11-27 | 2016-03-02 | 山西四建集团有限公司 | C30 durable recycled shaping aggregate concrete prepared from construction wastes and preparation method |
| CN105712679A (en) * | 2016-01-27 | 2016-06-29 | 西京学院 | Preparation method of nano mineral powder composite aramid fiber reinforced recycled concrete |
| CN107686292A (en) * | 2017-09-25 | 2018-02-13 | 贵州安凯达实业股份有限公司 | A kind of concrete |
| CN108529975A (en) * | 2018-05-11 | 2018-09-14 | 郑涛涛 | A kind of concrete and preparation method thereof |
| CN115626796A (en) * | 2022-09-08 | 2023-01-20 | 深圳市衡骏环保科技有限公司 | Recycled aggregate self-compacting concrete |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104058673A (en) * | 2014-07-04 | 2014-09-24 | 北京东方建宇混凝土科学技术研究院有限公司 | Lightweight aggregate concrete containing low-quality recycled aggregate and preparing method thereof |
| CN105367004A (en) * | 2015-11-27 | 2016-03-02 | 山西四建集团有限公司 | C30 durable recycled shaping aggregate concrete prepared from construction wastes and preparation method |
| CN105712679A (en) * | 2016-01-27 | 2016-06-29 | 西京学院 | Preparation method of nano mineral powder composite aramid fiber reinforced recycled concrete |
| CN107686292A (en) * | 2017-09-25 | 2018-02-13 | 贵州安凯达实业股份有限公司 | A kind of concrete |
| CN108529975A (en) * | 2018-05-11 | 2018-09-14 | 郑涛涛 | A kind of concrete and preparation method thereof |
| CN115626796A (en) * | 2022-09-08 | 2023-01-20 | 深圳市衡骏环保科技有限公司 | Recycled aggregate self-compacting concrete |
| CN115626796B (en) * | 2022-09-08 | 2023-11-24 | 深圳市衡骏环保科技有限公司 | Recycled aggregate self-compacting concrete |
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| CN103553503B (en) | 2015-09-30 |
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