CN110240440A - A method of improving high-strength regeneration concrete high temperature resistant and freeze thawing performance - Google Patents
A method of improving high-strength regeneration concrete high temperature resistant and freeze thawing performance Download PDFInfo
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- CN110240440A CN110240440A CN201910432815.XA CN201910432815A CN110240440A CN 110240440 A CN110240440 A CN 110240440A CN 201910432815 A CN201910432815 A CN 201910432815A CN 110240440 A CN110240440 A CN 110240440A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
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- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a kind of methods for improving high-strength regeneration concrete high temperature resistant and freeze thawing performance, a method of improving its durability for high-strength regeneration concrete under high temperature (up to 800 degree) and extreme freezing-thawing (100 Frozen-thawed cycleds of highest), it is main to be realized by incorporation basalt fibre and late stage maintenance method.Basalt fibre is mixed in concrete and helps to improve agent on crack resistance of concrete freeze thawing, impervious, high temperature resistance, can inhibit Fatigue crack initiation under concrete environmental damage and external force.When fibers content is 4kg/m3When recycled concrete strength it is with fastest developing speed and stablize, intensity is higher within 28 days, after 100 freeze thawing of regeneration concrete mass loss be no more than 1%, plain concrete columns intensity is higher after freeze thawing；Intensity is restored after underwater maintenance facilitates the loss of regeneration concrete high temperature for 24 hours, and when high-temperature temperature is less than 600 DEG C, intensity can be restored to peer-level.
Description
Technical field
The invention belongs to the intensive treatment fields of regeneration concrete, and in particular to a kind of to improve the high-strength resistance to height of regeneration concrete
The method of mild freeze thawing performance.
Background technique
Regeneration concrete refers to discarded concrete block after broken, cleaning, classification, is compounded by a certain percentage with grade
It closes, partly or entirely replaces the natural aggregates (mainly coarse aggregate) such as sandstone, add new coagulation made of cement, water etc. are matched
Soil.Basalt fibre is to pass through platinum-rhodium alloy bushing height by natural basalt ore after 1450-1500 DEG C of melting
Continuous fiber made of speed is drawn has a variety of excellent properties such as electrical isolation, corrosion-resistant, high temperature resistant, can effectively enhance mixed
Solidifying soil anti-crack germinating and extended capability, one of big fiber of four given priority to is classified as by China.
The prior art has disclosed, and basalt fibre is mixed into regeneration concrete can improve its high temperature resistant and freeze thawing performance,
But just 400 degree or so of its upper limit value resistant to high temperature, and it is directed to middle-and-low strength concrete, for high-intensitive basalt
Regeneration concrete without reference to.
Summary of the invention
In view of the above technical problems, the present invention is intended to provide a kind of improve high-strength regeneration concrete high temperature resistant and freeze thawing performance
Method, the present invention for highway turn over newly generated building concrete give up block, by basic regenerated coarse aggregate density, crushing refer to
The measurement of mark and water absorption rate, makes the high-strength concrete that compression strength reaches C60；It is strong for the age of high-strength regeneration concrete
By mixing basalt fibre recycled concrete strength can be improved to C80 grades or more, especially 50% regenerates thick bone in degree development
Material Replacement rate test piece intensity significantly improves, and finds optimal basalt fibre volume, and the high-strength regeneration for C60 or more is mixed
Solidifying soil by the maintenance after high temperature and mixes fiber, is remarkably improved the residual strength of high-strength regeneration concrete, and the present invention can incite somebody to action
It after discarded discarded concrete or building waste proper treatment, applies in engineering again, this will be for the protection of resource environment, society
The sustainable development of meeting, plays great impetus.
To achieve the above object, the technical scheme adopted by the invention is that:
A method of improving high-strength regeneration concrete high temperature resistant and freeze thawing performance comprising the steps of:
1) it will be sieved after discarded concrete or construction waste crushing, artificial removal's steel scrap muscle, brick, the scraps of paper and plastics obtain
Partial size is the regenerated coarse aggregate of 2.36-19mm；
2) it after the regenerated coarse aggregate for obtaining step 1) washes with water, impregnates between 24 hours to 3 days in water, best water
Middle soaking time is the regenerated coarse aggregate after immersion for 24 hours, water absorption rate≤3.5%；
3) it is stirred after mixing sand, cement and flyash, basalt fibre is then mixed in whipping process, obtains mixing
I, then coarse aggregate and water are added into mixing I, it is best that regenerated coarse aggregate, which accounts for the 50% of coarse aggregate total weight, in coarse aggregate, and is filled
After point stirred, casting concrete；
The basalt fibre incorporation is 0.5-8kg/m3, adding mode is more preferable for effect can be added above in three times,
It can certainly be added at one time, mixing time will also want manual intervention once long, by the needs on periphery toward center collection
In；
The water, cement, flyash, water-reducing agent, sand and coarse aggregate dosage, by weight respectively water 5.15-5.77
Part, 13.72-15.4 parts of cement, 3.43-3.85 parts of flyash, 0.0515-0.0578 parts of water-reducing agent, 21.35-22.05 parts of sand and
43.4-44.85.4 parts of coarse aggregate, wherein optimal dosage be 14.56 parts of cement, 3.64 parts of flyash, 0.0546 part of water-reducing agent,
21.7 parts and 44.1 parts of coarse aggregate of sand, the weight of water: the weight and=0.3 of cement and flyash；
The coarse aggregate is made of natural coarse aggregate and regenerated coarse aggregate；
4) by the step 3) concrete, the 1st time is carried out under conditions of 17-23 DEG C and relative humidity are greater than 90% and is supported
Then shield, first time curing time≤28 day carry out high-temperature calcination, conserve under water after calcining, and underwater curing time >=
For 24 hours, best underwater curing time be and be that interval 3-12h pours a water during first time conserves for 24 hours；
Temperature≤800 DEG C of the high-temperature calcination.
Preferably, the basalt fibre incorporation described in step 3) is 4kg/m3Or 5kg/m3, when basalt fibre is mixed
Entering amount is 4kg/m3Or 5kg/m3When regeneration concrete after Frozen-thawed cycled have preferable compression strength.
The present invention turns over the useless block of newly generated building concrete for highway, passes through basic regenerated coarse aggregate density, crushing
The measurement of index and water absorption rate makes the high-strength concrete that compression strength reaches C60；For the age of high-strength regeneration concrete
By mixing basalt fibre recycled concrete strength can be improved to C80 grades or more, especially 50% regeneration is thick in strength development
Aggregate Replacement rate test piece intensity significantly improves, and finds optimal basalt fibre volume, as shown in Figure 2.For C60 or more
High-strength regeneration concrete, by maintenance after high temperature and incorporation fiber, the remnants for being remarkably improved high-strength regeneration concrete are strong
Degree, especially fibers content are 5kg/m3When, after 400 degree of high temperature, residual strength is up to the 96% of former intensity, after 600 degree of high temperature,
High-strength regeneration concrete residual strength is up to the 91% of former intensity, up to 33% or more of former intensity at 800 degree.As shown in Figure 1.
Regenerated coarse aggregate surface is attached with old mortar and inside, and there are crackles.Regenerated coarse aggregate part is used in concrete
Or all reduce the endurance quality of concrete instead of natural coarse aggregate.It mixes the chopped silk of basalt fibre and inhibits concrete
Underbead crack germinating and extended capability under high temperature action and Frozen-thawed cycled, to improve regeneration concrete performance.
Beneficial effects of the present invention:
When fibers content is 4kg/m3When recycled concrete strength it is with fastest developing speed and stablize, intensity is higher within 28 days.Fiber is again
Mass loss is no more than 1% after 100 freeze thawing of growing concrete, and plain concrete columns intensity is higher after freeze thawing.Underwater maintenance helps for 24 hours
Intensity is restored after the loss of regeneration concrete high temperature.When high-temperature temperature is less than 600 DEG C, intensity can be restored to same water
It is flat.
Detailed description of the invention
Intensity after Fig. 1 fiber reinforcement regeneration concrete high-temperature process；
Fig. 2 cubic block compression strength-Frozen-thawed cycled curve, test specimen 10,20,30,22,24,25,26, first digit 1,
2,3 recycled coarse aggregate contents 0,50,100%, second digit basalt fibre silk volume 0,2,4,5,6kg/ are respectively represented
m3；, recycled coarse aggregate contents refer to that regenerated coarse aggregate accounts for the percentage of coarse aggregate total weight；
Test specimen residual qualities change curve in Fig. 3 Frozen-thawed cycled, test specimen 10,20,30,22,24,25,26, first digit
1, recycled coarse aggregate contents 0,50,100% are respectively represented 2,3, second digit basalt fibre silk volume 0,2,4,5,
6kg/m3。
Specific embodiment
Technical effect in order to further illustrate the present invention is specifically described the present invention below by embodiment.
Embodiment 1
1) it will be sieved after discarded concrete or construction waste crushing, obtain the regenerated coarse aggregate that partial size is 2.36mm；
2) it after the regenerated coarse aggregate for obtaining step 1) washes with water, impregnates in water for 24 hours；
3) it is stirred after mixing sand, cement and flyash, mixes basalt fibre in batches in stirring, obtain mixing I,
Coarse aggregate and water is added into mixing I again, and after being sufficiently stirred, casting concrete；
The basalt fibre incorporation is 0.5kg/m3；
The water, cement, flyash, water-reducing agent, sand and coarse aggregate dosage, by weight respectively 5.15 parts of water, water
13.72 parts of mud, 3.43 parts of flyash, 0.0515 part of water-reducing agent, 21.35 parts of sand and 43.4 parts of coarse aggregate；
The coarse aggregate is made of natural coarse aggregate and regenerated coarse aggregate；
4) by the step 3) concrete, the 1st maintenance is carried out under conditions of 17 DEG C and relative humidity are greater than 90%, so
After carry out high-temperature calcination, conserved under water after calcining for 24 hours, 400 DEG C of the temperature of the high-temperature calcination.
Embodiment 2
1) it will be sieved after discarded concrete or construction waste crushing, obtain the regenerated coarse aggregate that partial size is 10mm；
2) after the regenerated coarse aggregate for obtaining step 1) washes with water, 48h is impregnated in water；
3) it is stirred after mixing sand, cement and flyash, mixes basalt fibre in batches in stirring, obtain mixing I,
Coarse aggregate and water is added into mixing I again, and after being sufficiently stirred, casting concrete；
The basalt fibre incorporation is 4kg/m3；
The water, cement, flyash, water-reducing agent, sand and coarse aggregate dosage, by weight respectively 5.4 parts of water, cement
14.56 parts, 3.64 parts of flyash, 0.0546 part of water-reducing agent, 21.7 parts of sand and 44.1 parts of coarse aggregate；
The coarse aggregate is made of natural coarse aggregate and regenerated coarse aggregate；
4) by the step 3) concrete, the 1st maintenance is carried out under conditions of 20 DEG C and relative humidity are greater than 90%, so
After carry out high-temperature calcination, 48h, 400 DEG C of the temperature of the high-temperature calcination are conserved after calcining under water.
Embodiment 3
1) it will be sieved after discarded concrete or construction waste crushing, obtain the regenerated coarse aggregate that partial size is 19mm；
2) after the regenerated coarse aggregate for obtaining step 1) washes with water, 72h is impregnated in water；
3) it is stirred after mixing sand, cement and flyash, mixes basalt fibre in batches in stirring, obtain mixing I,
Coarse aggregate and water is added into mixing I again, and after being sufficiently stirred, casting concrete；
The basalt fibre incorporation is 5kg/m3；
The water, cement, flyash, water-reducing agent, sand and coarse aggregate dosage, by weight respectively 5.4 parts of water, cement
14.56 parts, 3.64 parts of flyash, 0.0546 part of water-reducing agent, 21.7 parts of sand and 44.1 parts of coarse aggregate；
The coarse aggregate is made of natural coarse aggregate and regenerated coarse aggregate；
4) by the step 3) concrete, the 1st maintenance is carried out under conditions of 23 DEG C and relative humidity are greater than 90%, so
After carry out high-temperature calcination, 48h, 800 DEG C of the temperature of the high-temperature calcination are conserved after calcining under water.
Embodiment 4
1) it will be sieved after discarded concrete or construction waste crushing, obtain the regenerated coarse aggregate that partial size is 19mm；
2) after the regenerated coarse aggregate for obtaining step 1) washes with water, 72h is impregnated in water；
3) it is stirred after mixing sand, cement and flyash, mixes basalt fibre in batches in stirring, obtain mixing I,
Coarse aggregate and water is added into mixing I again, and after being sufficiently stirred, casting concrete；
The basalt fibre incorporation is 8kg/m3；
The water, cement, flyash, water-reducing agent, sand and coarse aggregate dosage, by weight respectively 5.77 parts of water, water
15.4 parts of mud, 3.85 parts of flyash, 0.0578 part of water-reducing agent, 22.05 parts of sand and 44.8 parts of coarse aggregate；
The coarse aggregate is made of natural coarse aggregate and regenerated coarse aggregate；
5) by the step 3) concrete, the 1st maintenance is carried out under conditions of 23 DEG C and relative humidity are greater than 90%, so
After carry out high-temperature calcination, 48h, 800 DEG C of the temperature of the high-temperature calcination are conserved after calcining under water.
Embodiment 1-4 test result and its analysis, regeneration concrete mix after fiber filament after 100 Frozen-thawed cycleds intensity according to
So it is better than normal concrete；The compression strength of regeneration concrete has different degrees of raising after Frozen-thawed cycled；When fibers content is
4kg/m3When regeneration concrete after Frozen-thawed cycled have preferable compression strength.It is supported under water after 400 DEG C of high-temperature damages
Shield highest can retain the 96% of common cube of fast intensity, and basalt fibre volume is 5kg/m at this time3.When heat treatment temperature is 600
DEG C when be able to maintain the 91% of untreated test piece intensity.When treatment temperature is 800 DEG C, regeneration concrete strength is up to not
Handle the 33% of test piece intensity, about 19MPa.
Finally, it should be noted that the above examples are only used to illustrate the technical scheme of the present invention rather than limits, although ginseng
Technical solution of the present invention is described in detail according to preferred embodiment, it will be appreciated by those skilled in the art that can be to this
The technical solution of invention is modified or replaced equivalently, and without departing from the purpose and scope of the invention, should all be covered at this
In the protection scope of invention.
Claims (9)
1. a kind of method for improving high-strength regeneration concrete high temperature resistant and freeze thawing performance, which comprises the steps of:
1) it will be sieved after discarded concrete or construction waste crushing, obtain the regenerated coarse aggregate that partial size is 2.36-19mm；
2) after the regenerated coarse aggregate for obtaining step 1) washes with water, 3-24h is impregnated in water；
3) it is stirred after mixing sand, cement and flyash, basalt fibre is then mixed in whipping process, obtains mixing I, then
Coarse aggregate and water are added into mixing I, and after being sufficiently stirred, casting concrete；
The basalt fibre incorporation is 0.5-8kg/m3；
The water, cement, flyash, water-reducing agent, sand and coarse aggregate dosage, by weight respectively water 5.15-5.77 parts, water
13.72-15.4 parts of mud, 3.43-3.85 parts of flyash, 0.0515-0.0578 parts of water-reducing agent, 21.35-22.05 parts of sand and thick bone
43.4-44.8 parts of material；
The coarse aggregate includes natural coarse aggregate and regenerated coarse aggregate；
4) by the step 3) concrete, the 1st maintenance is carried out under conditions of 17-23 DEG C and relative humidity are greater than 90%, the
Curing time≤28 day, then carry out high-temperature calcination, conserve under water after calcining, and underwater curing time >=for 24 hours；
Temperature≤800 DEG C of the high-temperature calcination.
2. the method according to claim 1, wherein by discarded concrete or construction waste crushing in step 1)
Afterwards, artificial removal's steel scrap muscle, brick, the scraps of paper and plastics.
3. the method according to claim 1, wherein soaking time is for 24 hours in water described in step 2).
4. method according to claim 1 or 3, which is characterized in that the regenerated coarse aggregate after being impregnated in step 2), water absorption rate
≤ 3.5%.
5. the method according to claim 1, wherein the basalt fibre incorporation described in step 3) is
4kg/m3Or 5kg/m3。
6. the method according to claim 1, wherein regenerated coarse aggregate described in step 3) accounts for coarse aggregate total weight
50%.
7. the method according to claim 1, wherein in step 3) water weight: the weight of cement and flyash
=0.3.
8. the method according to claim 1, wherein being that interval 3-12h is poured during being conserved for the first time in step 4)
Water.
9. the method according to claim 1, wherein underwater curing time described in step 4) is for 24 hours.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110590289A (en) * | 2019-10-14 | 2019-12-20 | 广州珠江黄埔大桥建设有限公司 | Basalt fiber reinforced recycled concrete |
| CN111439977A (en) * | 2020-04-03 | 2020-07-24 | 沈阳理工大学 | Impact-resistant basalt fiber reinforced concrete and preparation method thereof |
| CN111881593A (en) * | 2020-08-05 | 2020-11-03 | 四川大学 | Method for detecting concrete freeze-thaw plasticity |
| WO2022242862A1 (en) * | 2021-05-20 | 2022-11-24 | Strabag Ag Spezialtiefbau | Fresh concrete |
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| CN107010896A (en) * | 2017-04-20 | 2017-08-04 | 福州大学 | A kind of regeneration concrete for filling be chopped basalt fibre and regenerated coarse aggregate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107010896A (en) * | 2017-04-20 | 2017-08-04 | 福州大学 | A kind of regeneration concrete for filling be chopped basalt fibre and regenerated coarse aggregate |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110590289A (en) * | 2019-10-14 | 2019-12-20 | 广州珠江黄埔大桥建设有限公司 | Basalt fiber reinforced recycled concrete |
| CN111439977A (en) * | 2020-04-03 | 2020-07-24 | 沈阳理工大学 | Impact-resistant basalt fiber reinforced concrete and preparation method thereof |
| CN111881593A (en) * | 2020-08-05 | 2020-11-03 | 四川大学 | Method for detecting concrete freeze-thaw plasticity |
| WO2022242862A1 (en) * | 2021-05-20 | 2022-11-24 | Strabag Ag Spezialtiefbau | Fresh concrete |
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