CN103864336B - A kind of preparation method of cementitious composite additive - Google Patents
A kind of preparation method of cementitious composite additive Download PDFInfo
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- CN103864336B CN103864336B CN201410045673.9A CN201410045673A CN103864336B CN 103864336 B CN103864336 B CN 103864336B CN 201410045673 A CN201410045673 A CN 201410045673A CN 103864336 B CN103864336 B CN 103864336B
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- 239000000654 additive Substances 0.000 title claims abstract description 39
- 230000000996 additive effect Effects 0.000 title claims abstract description 39
- 239000002131 composite material Substances 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 29
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000000292 calcium oxide Substances 0.000 claims abstract description 25
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 25
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229960000892 attapulgite Drugs 0.000 claims abstract description 21
- 239000004927 clay Substances 0.000 claims abstract description 21
- 229910001649 dickite Inorganic materials 0.000 claims abstract description 21
- 239000010881 fly ash Substances 0.000 claims abstract description 21
- 229910052625 palygorskite Inorganic materials 0.000 claims abstract description 21
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 19
- 229910052934 alunite Inorganic materials 0.000 claims abstract description 19
- 239000010424 alunite Substances 0.000 claims abstract description 19
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 19
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 19
- 229910001634 calcium fluoride Inorganic materials 0.000 claims abstract description 19
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229920000609 methyl cellulose Polymers 0.000 claims abstract description 19
- 239000001923 methylcellulose Substances 0.000 claims abstract description 19
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000000843 powder Substances 0.000 claims abstract description 19
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims abstract description 19
- KPZTWMNLAFDTGF-UHFFFAOYSA-D trialuminum;potassium;hexahydroxide;disulfate Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Al+3].[Al+3].[Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O KPZTWMNLAFDTGF-UHFFFAOYSA-D 0.000 claims abstract description 19
- 239000010457 zeolite Substances 0.000 claims abstract description 19
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims abstract description 19
- 229960001763 zinc sulfate Drugs 0.000 claims abstract description 19
- 229910000368 zinc sulfate Inorganic materials 0.000 claims abstract description 19
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims description 31
- 238000000227 grinding Methods 0.000 claims description 24
- 238000002156 mixing Methods 0.000 claims description 12
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 239000004615 ingredient Substances 0.000 claims 3
- 238000005336 cracking Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 230000003014 reinforcing effect Effects 0.000 abstract description 2
- 239000004567 concrete Substances 0.000 description 5
- 239000004568 cement Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- UPLPHRJJTCUQAY-WIRWPRASSA-N 2,3-thioepoxy madol Chemical compound C([C@@H]1CC2)[C@@H]3S[C@@H]3C[C@]1(C)[C@@H]1[C@@H]2[C@@H]2CC[C@](C)(O)[C@@]2(C)CC1 UPLPHRJJTCUQAY-WIRWPRASSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910001414 potassium ion Inorganic materials 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
Landscapes
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present invention discloses a kind of preparation method of cementitious composite additive, it is characterized in that: described cementitious composite additive raw material is: aluminum oxide clinker 30-35 part, calcined alunite 5-10 part, zinc sulfate 1-5 part, dickite 10-20 part, attapulgite clay 10-20 part, flyash 10-15 part, zeolite powder 1-5 part, diatomite 2-4 part, wilkinite 2-5 part, methylcellulose gum 1-2 part, S-WAT 0.5-1 part, unslaked lime 0.5-1 part, Calcium Fluoride (Fluorspan) 0.2-0.5 part, cementitious composite additive of the present invention has high-effective water-proof, moistureproof, expand, cracking resistance, the function such as impervious, to the effect of reinforcing bar non-corroding.
Description
Technical field
The present invention relates to a kind of preparation method of cementitious composite additive, belong to building material manufacture field.
Background technology
In engineering, many building basements, roofing, highway, bridge all do not reach design service life, some engineerings only come into operation and are just subject to havoc in several years, have to repair, its major cause be current water-proof material and concrete admixture generally containing Cl-,,, K+ ion is overweight, join in concrete, react with active silica in concrete, generate the silicate gel of alkali and produce concrete swelling cracking, alkali-aggregate reaction common in engineering that Here it is, accelerate steel bar corrosion simultaneously, cause concrete cracking to seep water.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of preparation method of cementitious composite additive with high-effective water-proof, protection against the tide, expansion, cracking resistance, the function such as impervious is provided.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of preparation method of cementitious composite additive, it is characterized in that: described cementitious composite additive raw material is: aluminum oxide clinker 30-35 part, calcined alunite 5-10 part, zinc sulfate 1-5 part, dickite 10-20 part, attapulgite clay 10-20 part, flyash 10-15 part, zeolite powder 1-5 part, diatomite 2-4 part, wilkinite 2-5 part, methylcellulose gum 1-2 part, S-WAT 0.5-1 part, unslaked lime 0.5-1 part, Calcium Fluoride (Fluorspan) 0.2-0.5 part
Described preparation method's step is:
Step (1): according to aluminum oxide clinker 30-35 part, calcined alunite 5-10 part, zinc sulfate 1-5 part, dickite 10-20 part, attapulgite clay 10-20 part, flyash 10-15 part, zeolite powder 1-5 part, diatomite 2-4 part, wilkinite 2-5 part, methylcellulose gum 1-2 part, S-WAT 0.5-1 part, unslaked lime 0.5-1 part, Calcium Fluoride (Fluorspan) 0.2-0.5 part proportioning prepares raw material
Step (2): aluminum oxide clinker 30-35 part, calcined alunite 5-10 part, zinc sulfate 1-5 part, dickite 10-20 part are carried out grinding in pulverizer, and rotating speed is 120r/min, grinding 6 hours, obtaining mixture A granularity size is 0.5-1mm,
Step (3): attapulgite clay 10-20 part, flyash 10-15 part, zeolite powder 1-5 part, diatomite 2-4 part, wilkinite 2-5 part are carried out grinding in pulverizer, rotating speed is 100r/min, grinding 2 hours, obtaining mixture B granularity size is 0.2-0.3mm
Step (4): step (2) is obtained mixture A and step (3) is obtained mixture B loading in mechanical mixer, mechanically mixing 1 hour, pour methylcellulose gum 1-2 part, S-WAT 0.5-1 part afterwards into, unslaked lime 0.5-1 part and Calcium Fluoride (Fluorspan) 0.2-0.5 part, mechanically mixing 2 hours, obtains cementitious composite additive again.
As preferably, the preparation method of described cementitious composite additive, cementitious composite additive raw material is: aluminum oxide clinker 32 parts, calcined alunite 7 parts, 2 parts, zinc sulfate, dickite 12 parts, attapulgite clay 15 parts, 14 parts, flyash, zeolite powder 3 parts, 3 parts, diatomite, wilkinite 4 parts, methylcellulose gum 1.5 parts, S-WAT 0.6 part, unslaked lime 0.7 part, 0.3 part, Calcium Fluoride (Fluorspan).
As preferably, the preparation method of described cementitious composite additive, cementitious composite additive raw material is: aluminum oxide clinker 33 parts, calcined alunite 8 parts, 4 parts, zinc sulfate, dickite 14 parts, attapulgite clay 14 parts, 13 parts, flyash, zeolite powder 2 parts, 3 parts, diatomite, wilkinite 4 parts, methylcellulose gum 1 part, S-WAT 0.8 part, unslaked lime 0.6 part, 0.5 part, Calcium Fluoride (Fluorspan).
As preferably, the preparation method of described cementitious composite additive, cementitious composite additive raw material is: aluminum oxide clinker 31 parts, calcined alunite 6 parts, 2 parts, zinc sulfate, dickite 14 parts, attapulgite clay 18 parts, 12 parts, flyash, zeolite powder 4 parts, 3 parts, diatomite, wilkinite 2 parts, methylcellulose gum 2 parts, S-WAT 0.6 part, unslaked lime 0.8 part, 0.4 part, Calcium Fluoride (Fluorspan).
As preferably, the preparation method of described cementitious composite additive, cementitious composite additive raw material is: aluminum oxide clinker 34 parts, calcined alunite 9 parts, 4 parts, zinc sulfate, dickite 19 parts, attapulgite clay 18 parts, 14 parts, flyash, zeolite powder 4 parts, 2 parts, diatomite, wilkinite 4 parts, methylcellulose gum 2 parts, S-WAT 0.7 part, unslaked lime 0.9 part, 0.4 part, Calcium Fluoride (Fluorspan).
As preferably, the preparation method of described cementitious composite additive, it is 0.7mm that step (2) obtains mixture A granularity size.
As preferably, the preparation method of described cementitious composite additive, it is 0.25mm that step (3) obtains mixture B granularity size.
As preferably, attapulgite clay composition is: 56.7%SiO
2, 16.8%MgO, 3.4%FeO, 5.5%Fe
2o
3, 9.1%Al
2o
3, 2.7%CaO, 5.8% loss on ignition.
As preferably, dickite composition is: 61.1%SiO
2, 31.3%Al
2o
3, 1.2%Fe
2o
3, 1.1%CaO, 0.5%MgO, 4.8% loss on ignition.
As preferably, flyash composition is: 53.3%SiO
2, 29.7%Al
2o
3, 5.3%Fe
2o
3, 2.1%CaO, 4.8%MgO, 4.8% loss on ignition.
Compared with prior art, the present invention has following beneficial effect:
The preparation of test sample: adopt cement 282g, the cementitious composite additive 18g prepared, sand 750g, water consumption 120ml, and shaping 40 × 40 × 160mm test specimen, temperature 20 ± 2 DEG C, humidity is maintenance under the condition of more than 90%.
The 6 quality % that obtained cementitious composite additive substitutes cement amount in cement-based material are mixed in cement-based material, make 20 pieces of test blocks, the average index detecting the properties of 20 pieces of test blocks is: fineness (specific surface area): 412m2/kg, time of coagulation: initial set 120min final set 290min, limited expansion rate: 7d-0.024%; 28d-0.015%, ultimate compression strength: 7d:30.1MPa; 28d:48.5MPa, permeated height compares: 33%, and water demand ratio: 66%, to steel bar corrosion effect: non-corroding.Cementitious composite additive of the present invention has high-effective water-proof, protection against the tide, expansion, cracking resistance, the function such as impervious, to the effect of reinforcing bar non-corroding, is the large technological breakthrough of current architectural waterproof material one.
Embodiment
Embodiment 1
A preparation method for cementitious composite additive, is characterized in that:
Described preparation method's step is:
Step (1): according to aluminum oxide clinker 30 parts, calcined alunite 5 parts, 1 part, zinc sulfate, dickite 10 parts, attapulgite clay 10 parts, 10 parts, flyash, zeolite powder 1 part, 2 parts, diatomite, wilkinite 2 parts, methylcellulose gum 1 part, S-WAT 0.5 part, unslaked lime 0.5 part, Calcium Fluoride (Fluorspan) 0.2 part of proportioning prepares raw material
Step (2): aluminum oxide clinker 30 parts, calcined alunite 5 parts, 1 part, zinc sulfate, dickite 10 parts are carried out grinding in pulverizer, and rotating speed is 120r/min, grinding 6 hours, obtaining mixture A granularity size is 0.5-1mm,
Step (3): attapulgite clay 10 parts, 10 parts, flyash, zeolite powder 1 part, 2 parts, diatomite, wilkinite 2 parts are carried out grinding in pulverizer, and rotating speed is 100r/min, grinding 2 hours, obtaining mixture B granularity size is 0.2-0.3mm,
Step (4): step (2) is obtained mixture A and step (3) is obtained mixture B loading in mechanical mixer, mechanically mixing 1 hour, pour methylcellulose gum 1 part, S-WAT 0.5 part afterwards into, unslaked lime 0.5 part and 0.2 part, Calcium Fluoride (Fluorspan), mechanically mixing 2 hours, obtains cementitious composite additive again.
Embodiment 2
A preparation method for cementitious composite additive, is characterized in that:
Described preparation method's step is:
Step (1): according to aluminum oxide clinker 35 parts, calcined alunite 10 parts, 5 parts, zinc sulfate, dickite 20 parts, attapulgite clay 20 parts, 15 parts, flyash, zeolite powder 5 parts, 4 parts, diatomite, wilkinite 5 parts, methylcellulose gum 2 parts, S-WAT 1 part, unslaked lime 1 part, Calcium Fluoride (Fluorspan) 0.5 part of proportioning prepares raw material
Step (2): aluminum oxide clinker 35 parts, calcined alunite 10 parts, 5 parts, zinc sulfate, dickite 20 parts are carried out grinding in pulverizer, and rotating speed is 120r/min, grinding 6 hours, obtaining mixture A granularity size is 0.5-1mm,
Step (3): attapulgite clay 20 parts, 15 parts, flyash, zeolite powder 5 parts, 4 parts, diatomite, wilkinite 5 parts are carried out grinding in pulverizer, and rotating speed is 100r/min, grinding 2 hours, obtaining mixture B granularity size is 0.2-0.3mm,
Step (4): step (2) is obtained mixture A and step (3) is obtained mixture B loading in mechanical mixer, mechanically mixing 1 hour, pour methylcellulose gum 2 parts, S-WAT 1 part afterwards into, unslaked lime 1 part and 0.5 part, Calcium Fluoride (Fluorspan), mechanically mixing 2 hours, obtains cementitious composite additive again.
Embodiment 3
A preparation method for cementitious composite additive, is characterized in that:
Described preparation method's step is:
Step (1): according to aluminum oxide clinker 32 parts, calcined alunite 7 parts, 3 parts, zinc sulfate, dickite 13 parts, attapulgite clay 13 parts, 13 parts, flyash, zeolite powder 3 parts, 3 parts, diatomite, wilkinite 3 parts, methylcellulose gum 1 part, S-WAT 0.6 part, unslaked lime 0.6 part, Calcium Fluoride (Fluorspan) 0.3 part of proportioning prepares raw material
Step (2): aluminum oxide clinker 32 parts, calcined alunite 7 parts, 3 parts, zinc sulfate, dickite 13 parts are carried out grinding in pulverizer, and rotating speed is 120r/min, grinding 6 hours, obtaining mixture A granularity size is 0.5-1mm,
Step (3): attapulgite clay 13 parts, 13 parts, flyash, zeolite powder 3 parts, 3 parts, diatomite, wilkinite 3 parts are carried out grinding in pulverizer, and rotating speed is 100r/min, grinding 2 hours, obtaining mixture B granularity size is 0.2-0.3mm,
Step (4): step (2) is obtained mixture A and step (3) is obtained mixture B loading in mechanical mixer, mechanically mixing 1 hour, pour methylcellulose gum 1 part, S-WAT 0.6 part afterwards into, unslaked lime 0.6 part, 0.3 part, Calcium Fluoride (Fluorspan), mechanically mixing 2 hours, obtains cementitious composite additive again.
Embodiment 4
A preparation method for cementitious composite additive, is characterized in that:
Described preparation method's step is:
Step (1): according to aluminum oxide clinker 32 parts, calcined alunite 8 parts, 2 parts, zinc sulfate, dickite 12 parts, attapulgite clay 12 parts, 12 parts, flyash, zeolite powder 2 parts, 3 parts, diatomite, wilkinite 4 parts, methylcellulose gum 2 parts, S-WAT 0.7 part, unslaked lime 0.7 part, Calcium Fluoride (Fluorspan) 0.4 part of proportioning prepares raw material
Step (2): aluminum oxide clinker 32 parts, calcined alunite 8 parts, 2 parts, zinc sulfate, dickite 12 parts are carried out grinding in pulverizer, and rotating speed is 120r/min, grinding 6 hours, obtaining mixture A granularity size is 0.5-1mm,
Step (3): attapulgite clay 12 parts, 12 parts, flyash, zeolite powder 2 parts, 3 parts, diatomite, wilkinite 4 parts are carried out grinding in pulverizer, and rotating speed is 100r/min, grinding 2 hours, obtaining mixture B granularity size is 0.2-0.3mm,
Step (4): step (2) is obtained mixture A and step (3) is obtained mixture B loading in mechanical mixer, mechanically mixing 1 hour, pour methylcellulose gum 2 parts, S-WAT 0.7 part afterwards into, unslaked lime 0.7 part, 0.4 part, Calcium Fluoride (Fluorspan), mechanically mixing 2 hours, obtains cementitious composite additive again.
Claims (6)
1. the preparation method of a cementitious composite additive, it is characterized in that: described cementitious composite additive raw material parts by weight are: aluminum oxide clinker 30-35 part, calcined alunite 5-10 part, zinc sulfate 1-5 part, dickite 10-20 part, attapulgite clay 10-20 part, flyash 10-15 part, zeolite powder 1-5 part, diatomite 2-4 part, wilkinite 2-5 part, methylcellulose gum 1-2 part, S-WAT 0.5-1 part, unslaked lime 0.5-1 part, Calcium Fluoride (Fluorspan) 0.2-0.5 part
Described preparation method's step is:
Step (1): according to aluminum oxide clinker 30-35 part, calcined alunite 5-10 part, zinc sulfate 1-5 part, dickite 10-20 part, attapulgite clay 10-20 part, flyash 10-15 part, zeolite powder 1-5 part, diatomite 2-4 part, wilkinite 2-5 part, methylcellulose gum 1-2 part, S-WAT 0.5-1 part, unslaked lime 0.5-1 part, Calcium Fluoride (Fluorspan) 0.2-0.5 part proportioning prepares raw material
Step (2): aluminum oxide clinker 30-35 part, calcined alunite 5-10 part, zinc sulfate 1-5 part, dickite 10-20 part are carried out grinding in pulverizer, and rotating speed is 120r/min, grinding 6 hours, obtaining mixture A granularity size is 0.5-1mm,
Step (3): attapulgite clay 10-20 part, flyash 10-15 part, zeolite powder 1-5 part, diatomite 2-4 part, wilkinite 2-5 part are carried out grinding in pulverizer, rotating speed is 100r/min, grinding 2 hours, obtaining mixture B granularity size is 0.2-0.3mm
Step (4): step (2) is obtained mixture A and step (3) is obtained mixture B loading in mechanical mixer, mechanically mixing 1 hour, pour methylcellulose gum 1-2 part, S-WAT 0.5-1 part afterwards into, unslaked lime 0.5-1 part and Calcium Fluoride (Fluorspan) 0.2-0.5 part, mechanically mixing 2 hours, obtains cementitious composite additive again.
2. the preparation method of cementitious composite additive as claimed in claim 1, it is 0.7mm that step (2) obtains mixture A granularity size.
3. the preparation method of cementitious composite additive as claimed in claim 1, it is 0.25mm that step (3) obtains mixture B granularity size.
4. the preparation method of cementitious composite additive as claimed in claim 1, attapulgite clay Ingredient percent is: 56.7%SiO
2, 16.8%MgO, 3.4%FeO, 5.5%Fe
2o
3, 9.1%Al
2o
3, 2.7%CaO, 5.8% loss on ignition.
5. the preparation method of cementitious composite additive as claimed in claim 1, dickite Ingredient percent is: 61.1%SiO
2, 31.3%Al
2o
3, 1.2%Fe
2o
3, 1.1%CaO, 0.5%MgO, 4.8% loss on ignition.
6. the preparation method of cementitious composite additive as claimed in claim 1, flyash Ingredient percent is: 53.3%SiO
2, 29.7%Al
2o
3, 5.3%Fe
2o
3, 2.1%CaO, 4.8%MgO, 4.8% loss on ignition.
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|---|---|---|---|
| CN201410045673.9A CN103864336B (en) | 2014-02-09 | 2014-02-09 | A kind of preparation method of cementitious composite additive |
| CN201510088350.2A CN104649607B (en) | 2014-02-09 | 2014-02-09 | A kind of preparation method of cementitious composite additive |
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| CN104400900A (en) * | 2014-10-27 | 2015-03-11 | 无为恒基商品混凝土有限公司 | Method for fabricating high-performance precast concrete |
| CN106746874A (en) * | 2015-11-20 | 2017-05-31 | 甘肃曼特睿尔公路材料研发有限责任公司 | A kind of cement additire and preparation method thereof |
| CN106966627A (en) * | 2017-04-11 | 2017-07-21 | 安徽省明美矿物化工有限公司 | A kind of concave convex rod cementitious composite additive and preparation method |
| CN115611551B (en) * | 2022-12-16 | 2023-03-14 | 石家庄市长安育才建材有限公司 | Alkali aggregate composite inhibitor and preparation method thereof |
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| CN1061953C (en) * | 1998-07-21 | 2001-02-14 | 赵洪义 | Compound additive for increase of blending amount and performance of cement mixed material |
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