CN105366969B - One kind regeneration self-hardening property cementitious material and preparation method thereof - Google Patents
One kind regeneration self-hardening property cementitious material and preparation method thereof Download PDFInfo
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- CN105366969B CN105366969B CN201510910156.8A CN201510910156A CN105366969B CN 105366969 B CN105366969 B CN 105366969B CN 201510910156 A CN201510910156 A CN 201510910156A CN 105366969 B CN105366969 B CN 105366969B
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Abstract
The present invention provides one kind regeneration self-hardening property cementitious material and preparation method thereof, according to mass percent, the composition of the cementitious material is：Gypsum slag cement 90 60%, regeneration concrete micro mist 10 40%.Its preparation method is：Waste and old concrete in building waste is crushed, obtains regeneration concrete fine aggregate, through 24 grindings, sieving, and the aperture of this 24 times sievings is sequentially reduced, and grinding time is sequentially increased；Sieving by 750 DEG C of 2 4h of calcining, obtains recycled concrete powder again；By gypsum, clinker, proportionally gypsum slag cement is made in combined grinding 1h to slag powders；Recycled concrete powder and gypsum slag cement are mixed with regeneration self-hardening property cementitious material.The present invention largely utilizes industrial residue and building waste, and energy consumption is significantly less than common portland cement, and production process energy conservation and environmental protection, has good economy and environmental benefit.
Description
Technical field
The invention belongs to building material field, and in particular to one kind regeneration self-hardening property cementitious material and preparation method thereof.
Background technology
China is in large-scale urbanization process at present, needs to remove a large amount of old buildings in Process of Urban Development,
Cause in recent years discarded concrete yield sharply increase.The total emission volumn of the annual building waste in China was 15.5 ~ 24 in recent years
Between hundred million tons, and in building waste it is largely discarded concrete.If these discarded concretes, which are not used, will take greatly
Valuable land resource is measured, and seriously pollutes environment, has become the society that can not be ignored and environmental issue.On the other hand,
Common portland cement is influenced by environmental protection to be increasingly subject to limit because of high energy consumption, discharge height.Therefore, construction refuse regenerated gelling material
Material has huge social demand.The regenerated resourcesization utilization both at home and abroad to discarded concrete is broadly divided into three aspects at present：One
It is the packing material for being used as roadbed or such as building block of low-intensity building product etc. after discarded concrete is crushed；Second, regenerated aggregate mixes
Solidifying soil technology；Third, fine powder replacing partial cement of the particle diameter less than 0.16mm is blended as activity latex material or mineral
Material.The construction refuse regenerated cementitious material generally use of existing document report is levigate, heating or and active blend（Flyash,
Miberal powder etc.）It is compound, but the activity of the regenerative gel material of these methods preparation is universal relatively low, cost is higher.Currently with building
Build micro mist prepare low-carbon cement research it is few, Lv Linnv using building waste micro mist and ultra-fine silicon ash be prepared for it is a kind of modified again
Raw rubber gel material, it is good all compared with general gelled material in the application effect of C30 and C50 concrete.Fang Yonghao utilizes discarded hardening
The raw material such as cement slurry and flyash, slag is prepared for a kind of regenerative gel material, and 28 days intensity of its different ratio are in 30-
Between 49.7MPa.It yet there are no and directly report the compound research of regeneration concrete micro mist and gypsum slag cement.
The content of the invention
It is it is an object of the invention to invent a kind of regeneration self-hardening property cementitious material and preparation method thereof, regeneration concrete is micro-
Powder is compound with gypsum slag cement, to excite the activity of regeneration concrete micro mist, improves the utilization rate of waste and old concrete.
In order to solve technical problem proposed by the invention, the technical solution adopted by the present invention：
One kind regeneration self-hardening property cementitious material, according to mass percent, the composition of the cementitious material is：Gypsum slag cement
90-60%, regeneration concrete micro mist 10-40%.
By mass fraction, the composition of the gypsum slag cement is：11-14 parts of gypsum, 3-6 parts of clinker, slag powders 78-83
Part.
A kind of preparation method for regenerating self-hardening property cementitious material, its step include：
（1）Prepare regeneration concrete micro mist：Waste and old concrete in building waste is crushed, obtains the thin bone of regeneration concrete
Material, through 2-4 grinding, sieving, and the aperture of this 2-4 times sieving is sequentially reduced, and grinding time is sequentially increased；Sieving passes through again
750 DEG C of calcining 2-4h, obtain recycled concrete powder, its specific surface area is in 360-450m2/kg；
（2）Prepare gypsum slag cement：By weight percentage, gypsum slag cement is by 11-14 parts of gypsum, clinker 3-
6 parts, 78-83 parts of slag powders, proportionally combined grinding 1h be made, its specific surface area is in 400-450m2Between/kg.
（3）By weight percentage, by step（1）Obtained 10-40wt% regeneration concretes micro mist and step（2）It is made
90-60wt% gypsum slag cements be mixed with regeneration self-hardening property cementitious material.
Step（1）In, 0.3mm sieves are crossed after the waste and old concrete in building waste is crushed to the rear grinding 5min of below 5mm,
By residue on sieve grinding 10min after 0.15mm, then 0.075mm sieves will be crossed after residue on sieve grinding 60min.
The gypsum is natural anhydrite or desulfurated plaster.
The specific surface area of the slag powders is more than 400m2/ kg, and grade for S95 grades and more than.
The clinker is by calcium hydroxide, lime stone and gypsum in mass ratio 1:（1~3）:（1~3）Combined grinding is to than table
Area is more than 350m2/kg。
Gypsum used is obtained using natural anhydrite or desulfurated plaster by 750 DEG C of calcining 2-4h in the clinker
Anhydrite.
The beneficial effects of the invention are as follows：The regeneration self-hardening property cementitious material of this hair mainly employs gypsum, slag and regeneration
This kind of industrial waste of concrete micro mist, energy conservation and environmental protection, realizes the recycling of discarded object, and simple production process, product
Function admirable, is widely used.
Brief description of the drawings
Fig. 1 is regenerative gel material XRD spectrum of the gypsum slag cement with regenerating concrete micro mist composition；
Fig. 2 is the porosity of gypsum slag cement and regeneration concrete micro mist mixed mortar；
Fig. 3 is the pore-size distribution of gypsum slag cement and regeneration concrete micro mist mixed mortar.
Embodiment
The present invention is further illustrated below by instantiation, but the present invention is not limited solely to following embodiments：
Embodiment 1
1 is pressed first:1:1 ratio combined addition anhydrous gypsum, calcium hydroxide and agstone is as clinker, ball milling 50min,
Its specific surface area is more than 350m2/kg；By mass fraction：14 parts of gypsum, 3 parts of clinker, the ratio that 83 parts of slag powders is by gypsum, ripe
Material, slag grinding 1h together, prepare gypsum slag cement.
Wherein, gypsum uses natural anhydrite；The specific surface area of slag powders is more than 400m2/ kg, and grade for S95 grades with
On.
0.3mm sieves are crossed after waste and old concrete in building waste is crushed to the rear grinding 5min of below 5mm, by residue on sieve powder
10min is ground after 0.15mm, then 0.075mm sieves will be crossed after residue on sieve grinding 60min；Sieving by 750 DEG C of calcining 2h, obtains again
To recycled concrete powder, its specific surface area is in 360-450m2/kg。
10wt% regeneration concretes micro mist and 90wt% gypsum slag cements are mixed with regeneration self-hardening property cementitious material.
The product can become a kind of regeneration self-hardening property cementitious material.Properties reach 52.5 class g cement standards；
Take 225 grams of 450 grams of the product, 1350 grams of normal sand, water shapings；
3 days intensity 28MPa, 28 days intensity 60MPa；
From the point of view of the self-hardening property cementitious material is with regard to intensity, 52.5 class g cement standards are can reach.
Embodiment 2
1 is pressed first:2:3 ratio combined addition anhydrous gypsum, calcium hydroxide and agstone is as clinker, ball milling 50min,
Its specific surface area is more than 350m2/kg；By mass fraction：11 parts of gypsum, 6 parts of clinker, 83 parts of slag powders, by gypsum, clinker, ore deposit
Slag grinding 1h together, prepares gypsum slag cement.
Wherein, the anhydrite that gypsum is obtained using desulfurated plaster by 750 DEG C of calcining 2-4h；The specific surface area of slag powders is big
In 400m2/ kg, and grade is S95 grades.
0.3mm sieves are crossed after waste and old concrete in building waste is crushed to the rear grinding 5min of below 5mm, by residue on sieve powder
10min is ground after 0.15mm, then 0.075mm sieves will be crossed after residue on sieve grinding 60min；Sieving by 750 DEG C of calcining 4h, obtains again
To recycled concrete powder, its specific surface area is in 360-450m2/kg。
20wt% regeneration concretes micro mist and 80wt% gypsum slag cements are mixed with regeneration self-hardening property cementitious material.
Take 225 grams of 450 grams of the product, 1350 grams of normal sand, water shapings；
3 days intensity 27.5MPa, 28 days intensity 59.5Pa；
From the point of view of the self-hardening property cementitious material is with regard to intensity, 52.5 class g cement standards are can reach.
Embodiment 3
1 is pressed first:3:2 ratio combined addition anhydrous gypsum, calcium hydroxide and agstone is as clinker, ball milling 50min,
Its specific surface area is more than 350m2/kg；By mass fraction：12 parts of gypsum, 5 parts of clinker, 80 parts of slag powders, by gypsum, clinker, ore deposit
Slag grinding 1h together, prepares gypsum slag cement.
Wherein, the anhydrite that gypsum is obtained using desulfurated plaster by 750 DEG C of calcining 2-4h；The specific surface area of slag powders is big
In 400m2/ kg, and grade is more than S95 grades.
0.3mm sieves are crossed after waste and old concrete in building waste is crushed to the rear grinding 5min of below 5mm, by residue on sieve powder
10min is ground after 0.15mm, then 0.075mm sieves will be crossed after residue on sieve grinding 60min；Sieving by 750 DEG C of calcining 3h, obtains again
To recycled concrete powder, its specific surface area is in 360-450m2/kg。
30wt% regeneration concretes micro mist and 70wt% gypsum slag cements are mixed with regeneration self-hardening property cementitious material.
Take 225 grams of 450 grams of the product, 1350 grams of normal sand, water shapings；
3 days intensity 27.8MPa, 28 days intensity 52.07MPa；
From the point of view of the self-hardening property cementitious material is with regard to intensity, 42.5 class g cement standards are can reach.
Embodiment 4
1 is pressed first:1:1 ratio combined addition anhydrous gypsum, calcium hydroxide and agstone is as clinker, ball milling 50min,
Its specific surface area is more than 350m2/kg；By mass fraction：14 parts of gypsum, 3 parts of clinker, the ratio that 78 parts of slag powders is by gypsum, ripe
Material, slag grinding 1h together, prepare gypsum slag cement.
Wherein, gypsum uses natural anhydrite；The specific surface area of slag powders is more than 400m2/ kg, and grade for S95 grades with
On.
0.3mm sieves are crossed after waste and old concrete in building waste is crushed to the rear grinding 5min of below 5mm, by residue on sieve powder
10min is ground after 0.15mm, then 0.075mm sieves will be crossed after residue on sieve grinding 60min；Sieving by 750 DEG C of calcining 4h, obtains again
To recycled concrete powder, its specific surface area is in 360-450m2/kg。
40wt% regeneration concretes micro mist and 60wt% gypsum slag cements are mixed with regeneration self-hardening property cementitious material.
Take 225 grams of 450 grams of the product, 1350 grams of normal sand, water shapings；
3 days intensity 25.9MPa, 28 days intensity 45.74MPa；
From the point of view of the self-hardening property cementitious material is with regard to intensity, 42.5 class g cement standards are can reach.
The present invention will be further described with reference to the accompanying drawings.
1. XRD analysis
As can be seen from Figure 1 the hydrated product of pure gypsum slag cement mainly contains entringite and thaumasite, adds
The sample of regeneration concrete micro mist has been added to add a kind of crystalline solid SiO2, this is introduced by regeneration concrete micro mist, brilliant
Body SiO2It with other substance reactions, can not can only promote the progress of hydration reaction as nucleus in hydration process.When regeneration is mixed
When solidifying soil micro mist volume is relatively low, it influences very little to product strength；But volume, which continues to improve, can reduce composite gelled material
Intensity.
2. MIP
Table 1 mixes different content gypsum slag cement and regeneration concrete micro mist glue sand test block MIP experimental results
| 100% Gypsum Mine Slag cement | 80% gypsum slag cement+20% is again Growing concrete micro mist | 60% gypsum slag cement+40% is again Growing concrete micro mist | |
| Porosity /% | 15.86 | 17.32 | 18.78 |
| P>100nm/% | 5.45 | 6.03 | 6.32 |
| P<100nm/% | 10.41 | 11.29 | 12.46 |
| 25.80 | 21.87 | 25.83 | |
| 14.9 | 12.0 | 10.6 | |
| 6.9 | 7.5 | 7.7 | |
| Average Pore Diameter (4V/A) | 12.9 | 11.4 | 10.3 |
| Tortuosity factor | 2.173 | 0.019 | 2.169 |
| Tortuosity | 37.8731 | 16.7462 | 7.8165 |
It is minimum to can be seen that the overall porosity of pure gypsum slag cement slurry from the porosity of table 1, also demonstrates it at the same time
Intensity is in peak, and the overall porosity for mixing 40% regeneration concrete micro mist reaches 18.28%, its intensity is also minimum.
Incorporation regeneration concrete micro mist is can be seen that from the data statistics in Fig. 2,3 central hole structure distributed datas and table 1
So that the aperture in mortar less than 100nm substantially increases, but more harmful hole is have also been introduced, this can be from the number more than 100nm
According to finding out.
The above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (6)
1. one kind regeneration self-hardening property cementitious material, it is characterised in that：According to mass percent, the composition of the cementitious material is：Stone
Cream slag cements 90-60%, regeneration concrete micro mist 10-40%；
By mass fraction, the composition of the gypsum slag cement is：11-14 parts of gypsum, 3-6 parts of clinker, 78-83 parts of slag powders；
The clinker is by calcium hydroxide, lime stone and gypsum in mass ratio 1:（1~3）:（1~3）Combined grinding is to specific surface area
More than 350m2/kg。
A kind of 2. preparation method for regenerating self-hardening property cementitious material, it is characterised in that：Its step includes：
（1）Prepare regeneration concrete micro mist：Waste and old concrete in building waste is crushed, obtains regeneration concrete fine aggregate,
Through 2-4 grinding, sieving, and the aperture of this 2-4 times sieving is sequentially reduced, and grinding time is sequentially increased；Sieving passes through 750 again
DEG C calcining 2-4h, obtain recycled concrete powder, its specific surface area is in 360-450m2/kg；
（2）Prepare gypsum slag cement：By weight percentage, gypsum slag cement is by 11-14 parts of gypsum, 3-6 parts of clinker
And 78-83 parts of slag powders, proportionally combined grinding 1h be made, its specific surface area is in 400-450m2Between/kg；
The clinker is by calcium hydroxide, lime stone and gypsum in mass ratio 1:（1~3）:（1~3）Combined grinding is to specific surface area
More than 350m2/kg；
（3）By weight percentage, by step（1）Obtained 10-40wt% regeneration concretes micro mist and step（2）Obtained 90-
60wt% gypsum slag cements are mixed with regeneration self-hardening property cementitious material.
3. the preparation method of regeneration self-hardening property cementitious material as claimed in claim 2, it is characterised in that：Step（1）In, it will build
Waste and old concrete in building refuse, which is crushed to after below 5mm after grinding 5min, crosses 0.3mm sieves, by residue on sieve grinding 10min after
0.15mm, then 0.075mm sieves will be crossed after residue on sieve grinding 60min.
4. the preparation method of regeneration self-hardening property cementitious material as claimed in claim 2, it is characterised in that：The gypsum is day
Right anhydrite or desulfurated plaster.
5. the preparation method of regeneration self-hardening property cementitious material as claimed in claim 2, it is characterised in that：The slag powders
Specific surface area is more than 400m2/ kg, and grade for S95 grades and more than.
6. the preparation method of regeneration self-hardening property cementitious material as claimed in claim 2, it is characterised in that：Institute in the clinker
The anhydrite obtained with gypsum using natural anhydrite or desulfurated plaster by 750 DEG C of calcining 2-4h.
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| CN112079583A (en) * | 2020-08-26 | 2020-12-15 | 武汉理工大学 | Building material product based on rapid carbonization of regenerated cementing material and preparation method thereof |
| CN112110664A (en) * | 2020-09-23 | 2020-12-22 | 武汉华强新型建筑材料有限公司 | Method for preparing recycled concrete based on activated water and recycled concrete |
| CN112456828A (en) * | 2020-12-22 | 2021-03-09 | 汝州市东江建筑工业科技有限公司 | Green early-strength universal portland cement for prefabricated parts and preparation method thereof |
| CN113979654B (en) * | 2021-10-21 | 2022-08-26 | 东南大学 | Gelling cyclic regeneration material of waste cement-based material and preparation method thereof |
| CN116409948A (en) * | 2021-12-31 | 2023-07-11 | 江苏苏博特新材料股份有限公司 | Low-carbon composite cementing material based on regenerated micro powder, and preparation method and application thereof |
| CN115724640B (en) * | 2022-05-12 | 2024-04-19 | 东南大学 | Gypsum slag cement concrete and preparation method thereof |
| CN114988783A (en) * | 2022-05-24 | 2022-09-02 | 浙江甚骅建设有限公司 | Clinker-free cement concrete based on construction waste proportion and preparation method thereof |
| FI130623B (en) * | 2022-12-15 | 2023-12-18 | Ecoup Oyj | Hardening mixture |
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| CN102515584B (en) * | 2011-11-21 | 2013-07-17 | 武汉理工大学 | Regenerated concrete and manufacturing method thereof |
| CN103787602B (en) * | 2014-01-17 | 2015-12-02 | 北京奥润开元环保科技研究院有限公司 | A kind of ultra-fine regenerated powder complex geological polymer gel material |
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