CN103964734A - YeAn high-strength high-performance concrete macromolecular polymer admixture and preparation method thereof - Google Patents
YeAn high-strength high-performance concrete macromolecular polymer admixture and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a YeAn high-strength high-performance concrete macromolecular polymer admixture and a preparation method thereof, which belong to the technical filed of concrete admixture. The admixture comprises the following raw materials in percentage by weight: 37% of formaldehyde, phenol, urea, sulphanilic acid sodium, naphthalene sulfonic acid sodium, an aliphatic water-reducing admixture, 98% of sulphuric acid, 30% of NaOH solution, hydroxyl methyl cellulose, K12 (dodecyl sulphuric acid), sodium thiosulfate, ammonium persulfate and water. The preparation method of the admixture comprises the following steps: adding urea, formaldehyde, phenol, sulphuric acid, sulphanilic acid sodium, naphthalene sulfonic acid sodium, aliphatic water-reducing admixture and ammonium persulfate into a reaction tank in sequence to react; cooling; adding 30% of NaOH to neutralize; adding air entraining mixture, adhesive and plastic retaining agent and hardening accelerating admixture (dodecyl sodium sulfate and carboxy methyl cellulose sodium thiosulfate); drying; obtaining the high-strength high-performance water-reducing mixture. The YeAn high-strength high-performance concrete macromolecular polymer admixture can be used for preparing high-strength concrete, the water-reducing rate and the compressive strength of products are apparently improved, and the slump loss is reduced.
Description
Technical field
The present invention relates to technical field of concrete additives, especially a kind of YeAn high-strength high-performance concrete high molecular polymer admixture.
Background technology
Concrete admixture refers to as improving and regulate the material of concrete performance admixture.The application of concrete admixture in engineering more and more comes into one's own, and the interpolation of admixture plays a role to improving concrete performance.
At present, conventional admixture mainly contains following four classes both at home and abroad: 1. naphthalene series high-efficiency water-reducing agent, 2. amino high efficiency water reducing agent, 3. aliphatic water reducing agent, 4. poly carboxylic acid series water reducer.Wherein naphthalene series high-efficiency water-reducing agent price is low, but water-reducing rate is lower, concrete strength rate of increase is low, and and inferior suitability, the above high-strength concrete of preparation C60 is difficulty quite, need a large amount of other subsidiary function materials of application to prepare successfully, and concrete mix slump-loss is fast, later concrete shrinking percentage is larger.Amino high efficiency water reducing agent water-reducing rate is higher, and concrete strength rate of increase is higher, good with cement adaptability, little loss of slump, but concrete coagulating time is longer, and the easy bleeding of concrete, even hardens, and amino water reducer affects by starting material, and its cost is higher.Aliphatic high-efficiency water reducing agent, water-reducing rate is between naphthalene system and amino, better with cement adaptability, but bleed is larger, and concrete rate of increase is not high, prepares separately high-strength concrete difficulty larger, is generally applied to low-grade concrete, and early collapsing by force, it is little to damage.Polycarboxylic acid high-performance water reducer is affected by large raw material monomer, occur that fluctuation is larger, and cost is higher during quality product application, and harsh to ingredient requirements such as cement, sand, stones, poor with cement adaptability, concrete strength rate of increase is large, good endurance.
Above four class materials, 1. 2. 3. compatible, with 4. incompatible, if can develop a kind of product, than 4. cost is low, performance is suitable, has advantages of again 1. 2. 3. three kinds of product performance, and its market outlook must be bright.
Summary of the invention
The object of the present invention is to provide a kind of YeAn high-strength high-performance concrete high molecular polymer admixture and preparation method thereof.Admixture of the present invention for concrete batching, is compared with polycarboxylic acids dehydragent, and better with the adaptability to raw material such as cement, sand, stone, quality product is more stable, and cost is lower, and, suitable with polycarboxylic acids dehydragent at strength growth rate and weather resistance; Compared to naphthalene system, amino and aliphatic water reducing agent, when water reducer of the present invention is used for concrete, product water-reducing rate ultimate compression strength obviously increases, and collapses to damage to reduce, and has overcome above-mentioned the deficiencies in the prior art.
The technical solution adopted in the present invention is:
A YeAn high-strength high-performance concrete high molecular polymer admixture, is characterized in that, by following raw material, is made:
37% formaldehyde, phenol, urea, sodium sulfanilate, sodium naphthalene sulfonate, aliphatic water reducing agent, 98% sulfuric acid, 30%NaOH solution, Walocel MT 20.000PV, sodium lauryl sulphate (K12), Sulfothiorine, ammonium persulphate, water.
Preferably, by the raw material of following weight percent, made:
37% formaldehyde 8-12%, phenol 2-5%, urea 1-5%, sodium sulfanilate 3-8%, sodium naphthalene sulfonate (naphthalene water reducer) 10-15%, aliphatic water reducing agent 4-9%, 98% sulfuric acid 3-8%, 30%NaOH solution 8-14%, Walocel MT 20.000PV 0.05-0.2%, sodium lauryl sulphate (K12) 0.1-0.4%, Sulfothiorine 0.5-2.2%, ammonium persulphate 0.05-0.12%, water 40-60%, the weight percent of above each component is 100%.
Preferably, by the raw material of following weight percent, made:
37% formaldehyde 9.6%, phenol 3%, urea 2%, sodium sulfanilate 6%, sodium naphthalene sulfonate 12%, aliphatic water reducing agent 6%, 98% sulfuric acid 5%, 30%NaOH solution 10%, Walocel MT 20.000PV 0.1%, sodium lauryl sulphate (K12) 0.2%, Sulfothiorine 1%, ammonium persulphate 0.1%, water 45%, the weight percent of above each component is 100%.
The present invention also provides a kind of preparation method of YeAn high-strength high-performance concrete high molecular polymer admixture, it is characterized in that, comprises the following steps:
1. by above-mentioned weight percent, take raw material;
2. the urea and the formaldehyde that step are taken in are 1. soluble in water, are placed in hold-up vessel, under 40-50 ℃ of condition, react 1-2h, obtain mixed solution one;
3. the phenol, the sulfuric acid that step are taken in 1. add in retort, mix, and then the mixed solution of 1/3rd volumes one are dropped in retort, are heated to 60-70 ℃, reaction 1h;
4. sodium sulfanilate, sodium naphthalene sulfonate, aliphatic water reducing agent and ammonium persulphate step being taken in 1. adds in the retort of step in 3., mix, then the mixed solution one that remains 2/3rds volumes is dropped in retort, be heated to 80-90 ℃, reaction 3-4h;
5. step 4. in mixture temperature be down to 55-65 ℃, proceed in neutralization tank, the 30%NaOH solution that then adds step to take in 1., mixes;
6. the sodium lauryl sulphate and the Walocel MT 20.000PV that step are taken in are 1. added in neutralization tank, mix;
7. Sulfothiorine step being taken in is 1. added in the mixture of 6. processing through step, stirs, then dry, obtains high-strength and high performance water reducer.
Beneficial effect of the present invention:
This material for concrete batching, is compared with polycarboxylic acids dehydragent, and better with the adaptability to raw material such as cement, sand, stone, quality product is more stable, and cost is lower, and, suitable with polycarboxylic acids dehydragent at strength growth rate and weather resistance; Compared to naphthalene system, amino and aliphatic water reducing agent, when water reducer of the present invention is used for concrete, product water-reducing rate ultimate compression strength obviously increases, and collapses to damage to reduce, and has overcome the deficiencies in the prior art described in background technology.
Concrete,
(1) add 3 days intensity of concrete that water reducer of the present invention obtains and reach the more than 50% of 28 days intensity percent, 28 days strength growth rates are greater than 80% simultaneously;
(2) adding the concrete durability that water reducer of the present invention obtains improves more than 2 times;
(3) add the concrete water-reducing ratio that water reducer of the present invention obtains and be greater than 25%;
(4) add the early age strength of concrete that water reducer of the present invention obtains high, later strength sustainable growth;
(5) add concrete 1 day compressive strength rate >=170% that water reducer of the present invention obtains;
(6) add concrete 28 days compressive strength rate >=150% that water reducer of the present invention obtains;
(7) adding concrete 1h that water reducer of the present invention obtains collapses to damage and is less than 20mm;
(8) water reducer of the present invention can be for the concrete of preparation C15-C100, be used in preparation C60-C100 concrete, also can reach above effect (more difficult when existing a lot of water reducers are used for preparing concrete more than C60, often to need to add other supplies);
(9) water reducer cost of the present invention is low, compared to polycarboxylic acid high-performance water reducer, and cost 10-20%, performance is high.
Accompanying drawing explanation
Accompanying drawing 1 is preparation method's of the present invention schema.
Embodiment
In order to understand better the present invention, below in conjunction with embodiment, further illustrate content of the present invention, but content of the present invention is not only confined to the following examples, embodiment should not regard limiting the scope of the present invention as.
The present invention is in order to develop the high-performance water reducing agent of novel environmental type resin type, by polymerization, physics and chemical reaction, and a kind of multi-functional resins type of composition generation water reducer.Theoretical foundation to this high efficiency water reducing agent, formula, technique, parameter, reaction mechanism, impact on concrete workability, slump-loss, time of coagulation, impermeability, mechanical property and and cement adaptability, the performances such as concrete contraction are studied, and make development nonpoisonous and tasteless without the cold high-performance water reducing agent scheme of ammonia.
The theoretical investigation of water reducer of the present invention:
1. Concrete Additive metal surface promoting agent category, adds in concrete and can significantly reduce solvent and its liquid-liquid interface tension force, has hydrophilic, lipophilic group, generally have-OH of hydrophilic radical ,-COOH ,-C-NH
2,
(carbonyl) ,-SO
3r, these groups not only make molecule have wetting ability, but also can make molecule have dispersiveness, oilness, thickening property etc., if use properly, these performances can show preferably.
2. concerning solid-liquid interface, because surface has intrinsic shape, the absorption of tensio-active agent declines surface tension γ, thereby produces a series of surface phenomena, as disperseed, wetting, foaming, emulsification, washing, lubricate, improved system stability.Water reducer dissociates, and the electrokinetic potential ζ of micelle is improved, and electrostatic repulsion increases, and forms adsorption film with cement particulate, discharges free-water, has diminishing plasticizing effect.
3. in admixture, some functional group can be combined into hydrogen bond in grout, makes water particle microparticle surfaces form the stable solvent hydration shell of one deck, has inhibition, thereby reaches the effect of moulding of protecting.
4. in concrete mixture, introduce certain micro-bubble and can play thickening, water retention.
5. the Ca (OH) that utilizes reactive polymer and hydrated cementitious to separate out
2complex reaction, makes cement surface form one deck complex compound and hinders cement early hydration, has slow setting, protects the effect of moulding.
6. in admixture, sulfo group can play water-reduction, and-OH ,-COOH etc. play the effect of collapsing of protecting, therefore, make-SO
3r and-the OH ,-functional groups such as COOH are grafted in water-soluble polymer.
Reaction mechanism of the present invention and countermeasure:
According to above theory, selecting sodium sulfanilate, sodium naphthalene sulfonate, aliphatic water reducing agent, phenol is main raw material, general-SO
3r ,-NH
2,-OHDeng functional group passes through CH
2the bridging effect of O, connects into various functional groups the flexible macromolecule of one gear-like.Its reaction mechanism is as follows:
Therefore,, according to theoretical foundation and reaction mechanism, take following measures:
Therefore, introducing-OH ,-COOH ,-C-NH in water-soluble polymer
2,
(carbonyl) ,-SO
3the hydrophilic radicals such as R, strict its molecular weight of controlling, makes macromolecular structure be the soft line style of gear-like, adjusts pH, make itself and cement particulate be three-dimensional absorption, surface tension reduces, and increases its space repulsion, and 2eta current potential declines and reduces at any time, dispersion effect is better, little loss of slump, and can make mixture cohesiveness, trickling property increase, thickening water conservation is satisfactory for result.
Morning is strong, thickening, guarantor mould, tackify, strengthen, intensify etc. component carry out composite, thereby cement water reducing agent is had superly to be moulded, protect mould, anti-segregation, thickening, early strong, enhancing etc. are multi-functional.
Below in conjunction with example, the present invention will be further described:
Embodiment 1:
Proportioning raw materials 1:37% formaldehyde 9.6%, phenol 3%, urea 2%, sodium sulfanilate 6%, sodium naphthalene sulfonate 12%, aliphatic water reducing agent 6%, 98% sulfuric acid 5%, 30%NaOH solution 10%, Walocel MT 20.000PV 0.1%, sodium lauryl sulphate (K12) 0.2%, Sulfothiorine 1%, ammonium persulphate 0.1%, water 45%.
Proportioning raw materials 2:37% formaldehyde 8%, phenol 4%, urea 3%, sodium sulfanilate 7%, sodium naphthalene sulfonate 11%, aliphatic water reducing agent 8%, 98% sulfuric acid 5%, 30%NaOH solution 12%, Walocel MT 20.000PV 0.15%, sodium lauryl sulphate (K12) 0.3%, Sulfothiorine 1.5%, ammonium persulphate 0.05%, water 40%, the weight percent of above each component is 100%.
The preparation method of above-mentioned two kinds of proportionings is all as follows:
1. by above-mentioned weight percent, take raw material;
2. the urea and the formaldehyde that step are taken in are 1. soluble in water, are placed in hold-up vessel, under 40-50 ℃ of condition, react 1-2h, obtain mixed solution one;
3. the phenol, the sulfuric acid that step are taken in 1. add in retort, mix, and then the mixed solution of 1/3rd volumes one are dropped in retort, are heated to 60-70 ℃, reaction 1h;
4. sodium sulfanilate, sodium naphthalene sulfonate, aliphatic water reducing agent and ammonium persulphate step being taken in 1. adds in the retort of step in 3., mix, then the mixed solution one that remains 2/3rds volumes is dropped in retort, be heated to 80-90 ℃, reaction 3-4h;
5. by step 4. in mixture temperature be down to 55-65 ℃, proceed in neutralization tank, the 30%NaOH solution that then adds step to take in 1., mixes;
6. the sodium lauryl sulphate and the Walocel MT 20.000PV that step are taken in are 1. added in neutralization tank, mix;
7. Sulfothiorine step being taken in is 1. added in the mixture of 6. processing through step, stirs, then dry, obtains high-strength and high performance water reducer.
Embodiment 2:
High-strength high-performance concrete high molecular polymer admixture (filling a prescription 1 in embodiment) is strangled in mine (main shaft, auxiliary shaft, ventilating shaft) C80P12 and is applied at the dejected height of Ordos, inner Mongolia Hangjin Banner Shenhua Group.
It is 1,200 ten thousand tons that the dejected height of Shenhua Group is strangled colliery annual output designed productive capacity, dark 650 meters of mine; Concrete inner wall adopts C80P12 concrete, and the slump requires to keep 220mm after one hour; By experimental study and concrete proportion design, successful Application YeAn high-strength and high performance admixture preparation C80P12 concrete has reached 30000m
3by construction, through construction engineering quality monitoring station, Erdos, check, concrete strength, imperviously all reach design requirements, obtained good techno-economic effect, its weather resistance has been evaluated, compared to the concrete that does not add water reducer, weather resistance improves 2.4 times, and other design parameters are as shown in table 1 below.
Table 1 concrete high molecular polymer of the present invention admixture is strangled the technical parameter in mine construction at the dejected height of Shenhua Group
| 3 days ultimate compression strength (MPa) | Within 3 days, intensity reaches per-cent | 28 days ultimate compression strength (MPa) | Strength growth rate | The 1h damage of collapsing | Water-reducing rate |
| 47.2 | 50.8% | 92.9 | 96.8% | <20mm | 27.8% |
Embodiment 3:
High-strength high-performance concrete high molecular polymer admixture (filling a prescription 1 in embodiment) is examined application in the plain mine in Kazakhstan (main shaft, auxiliary shaft, ventilating shaft) at Ordos, inner Mongolia state electricity.
State's electricity is examined and is breathed out plain Coal Mines Hebei electric power and state's electricity jjoint venture investment, year designed productive capacity is that 1500 Wan Dun state electricity are examined and breathed out element to strangle mine (auxiliary shaft, ventilating shaft) be vertical, and dark 580 meters, main shaft is inclined shaft, auxiliary shaft and ventilating shaft inwall adopt concrete C70P10, and the slump requires to keep 200mm after one hour; Successful Application YeAn high-strength and high performance admixture preparation C70P10 concrete has reached 18000m
3by construction, through construction engineering quality monitoring station, Erdos and coal system, detect unit detection, concrete strength, imperviously all reach design requirements, obtained good techno-economic effect, its weather resistance has been evaluated, compared to the concrete that does not add water reducer, weather resistance improves 2.3 times, and other design parameters are as shown in table 2 below.
Table 2 concrete high molecular polymer of the present invention admixture examines at state's electricity the technical parameter of breathing out in plain mine construction
| 3 days ultimate compression strength (MPa) | Within 3 days, intensity reaches per-cent | 28 days ultimate compression strength (MPa) | Strength growth rate | The 1h damage of collapsing | Water-reducing rate |
| 44.4 | 53.6% | 82.9 | 86.7% | <20mm | 28.6% |
Embodiment 4:
High-strength high-performance concrete high molecular polymer admixture (filling a prescription 1 in embodiment) Ordos, inner Mongolia Wushen Banner Ba Yan is high strangle coal mine (main shaft, auxiliary shaft, ventilating shaft) in application.
Wushen Banner Ba Yan is high, and the colliery of strangling is to be invested by Shandong Zibo mineral group company, year designed productive capacity is 8,000,000 tons, main shaft, auxiliary shaft, ventilating shaft inwall adopt C65-C80 concrete, and successful Application YeAn high-strength and high performance admixture preparation C65-C80 concrete has reached 20000m
3concrete workability is good, and formation of concrete is bright and clean, without pitted skin, crackle, concrete strength, impervious, freeze-thaw-all meets design requirement, and has obtained good techno-economic effect, its weather resistance is evaluated, compared to the concrete that does not add water reducer, weather resistance improves 2.52 times, and other design parameters are as shown in table 3 below.
Table 3 concrete high molecular polymer of the present invention admixture is at the high technical parameter of strangling in coal mine engineering of Wushen Banner Ba Yan
| 3 days ultimate compression strength (MPa) | Within 3 days, intensity reaches per-cent | 28 days ultimate compression strength (MPa) | Strength growth rate | The 1h damage of collapsing | Water-reducing rate |
| 46.2 | 50.8% | 90.8 | 96.9% | <20mm | 29% |
Embodiment 5:
High-strength high-performance concrete high molecular polymer admixture (filling a prescription 1 in embodiment), at walnut valley, Gansu coal mine (auxiliary shaft, ventilating shaft), is applied in Xin Zhuan colliery (main shaft, auxiliary shaft).Colliery year, designed productive capacity was 8,000,000 tons, dark 900 meters of vertical, and (auxiliary shaft, ventilating shaft) outer wall adopts C80P8, and inwall adopts C80P10, and having applied C80P8 concrete has 20000m
3, C80P10 concrete has 30000m
3, by Shaanxi Province construction engineering quality inspection center, to verify, and obtain good techno-economic effect, its weather resistance is evaluated, and compared to the concrete that does not add water reducer, weather resistance improves 2.45 times, and other design parameters are as shown in table 4 below.
The technical parameter of table 4 concrete high molecular polymer of the present invention admixture in the coal mine engineering of walnut valley, Gansu
| 3 days ultimate compression strength (MPa) | Within 3 days, intensity reaches per-cent | 28 days ultimate compression strength (MPa) | Strength growth rate | The 1h damage of collapsing | Water-reducing rate |
| 49 | 53.4% | 91.7 | 87.1% | <20mm | 26.8% |
Embodiment 6:
High-strength high-performance concrete high molecular polymer admixture (filling a prescription 1 in embodiment) is applied in Shanxi Gao Jiabao coal mine (main shaft, auxiliary shaft, ventilating shaft), main shaft, auxiliary shaft, the outer wall thickness of ventilating shaft are 500-700mm, adopt C30-C50 chutable concrete, interior wall thickness 800-1500mm, adopt C60-C70 high slump concrete, the about 120000m of concrete total amount
3formation of concrete is bright and clean, without pitted skin, crackle, concrete strength, impervious, freeze-thaw-all meets design requirement, obtained good techno-economic effect, its weather resistance has been evaluated, compared to the concrete that does not add water reducer, weather resistance improves 2.7 times, and other design parameters are as shown in table 5 below.
The technical parameter of table 5 concrete high molecular polymer of the present invention admixture in the coal mine engineering of walnut valley, Gansu
| 3 days ultimate compression strength (MPa) | Within 3 days, intensity reaches per-cent | 28 days ultimate compression strength (MPa) | Strength growth rate | The 1h damage of collapsing | Water-reducing rate |
| 40.9 | 50.2% | 81.5 | 99.3% | <20mm | 25.9% |
Claims (4)
1. a YeAn high-strength high-performance concrete high molecular polymer admixture, is characterized in that, by following raw material, is made:
37% formaldehyde, phenol, urea, sodium sulfanilate, sodium naphthalene sulfonate, aliphatic water reducing agent, 98% sulfuric acid, 30%NaOH solution, Walocel MT 20.000PV, sodium lauryl sulphate, Sulfothiorine, ammonium persulphate, water.
2. YeAn high-strength high-performance concrete high molecular polymer admixture according to claim 1, is characterized in that, by the raw material of following weight percent, is made:
37% formaldehyde 8-12%, phenol 2-5%, urea 1-5%, sodium sulfanilate 3-8%, sodium naphthalene sulfonate 10-15%, aliphatic water reducing agent 4-9%, 98% sulfuric acid 3-8%, 30%NaOH solution 8-14%, Walocel MT 20.000PV 0.05-0.2%, sodium lauryl sulphate 0.1-0.4%, Sulfothiorine 0.5-2.2%, ammonium persulphate 0.05-0.12%, water 40-60%, the weight percent of above each component is 100%.
3. YeAn high-strength high-performance concrete high molecular polymer admixture according to claim 2, is characterized in that, by the raw material of following weight percent, is made:
37% formaldehyde 9.6%, phenol 3%, urea 2%, sodium sulfanilate 6%, sodium naphthalene sulfonate 12%, aliphatic water reducing agent 6%, 98% sulfuric acid 5%, 30%NaOH solution 10%, Walocel MT 20.000PV 0.1%, sodium lauryl sulphate 0.2%, Sulfothiorine 1%, ammonium persulphate 0.1%, water 45%, the weight percent of above each component is 100%.
4. according to a preparation method for the YeAn high-strength high-performance concrete high molecular polymer admixture described in the arbitrary claim of claim 1-3, it is characterized in that, comprise the following steps:
1. by the weight percent described in claim 1-3, take raw material;
2. the urea and the formaldehyde that step are taken in are 1. soluble in water, are placed in hold-up vessel, under 40-50 ℃ of condition, react 1-2h, obtain mixed solution one;
3. the phenol, the sulfuric acid that step are taken in 1. add in retort, mix, and then the mixed solution of 1/3rd volumes one are dropped in retort, are heated to 60-70 ℃, reaction 1h;
4. sodium sulfanilate, sodium naphthalene sulfonate, aliphatic water reducing agent and ammonium persulphate step being taken in 1. adds in the retort of step in 3., mix, then the mixed solution one that remains 2/3rds volumes is dropped in retort, be heated to 80-90 ℃, reaction 3-4h;
5. by step 4. in mixture temperature be down to 55-65 ℃, proceed in neutralization tank, the 30%NaOH solution that then adds step to take in 1., mixes;
6. the sodium lauryl sulphate and the Walocel MT 20.000PV that step are taken in are 1. added in neutralization tank, mix;
7. Sulfothiorine step being taken in is 1. added in the mixture of 6. processing through step, stirs, then dry, obtains high-strength and high performance water reducer.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105585275A (en) * | 2015-12-24 | 2016-05-18 | 江苏百瑞吉新材料有限公司 | Concrete admixture for roads |
| CN114508234A (en) * | 2022-01-25 | 2022-05-17 | 中建三局集团有限公司 | Anti-crack construction method for basement concrete outer wall |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1970489A (en) * | 2006-12-05 | 2007-05-30 | 西安建筑科技大学 | Low cost modified sulfamate high-effective water-reducing agent and its preparation method |
| CN102898059A (en) * | 2012-11-01 | 2013-01-30 | 徐友娟 | High-performance sulfamic acid water reducing agent and preparation method thereof |
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2014
- 2014-04-15 CN CN201410157399.4A patent/CN103964734B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1970489A (en) * | 2006-12-05 | 2007-05-30 | 西安建筑科技大学 | Low cost modified sulfamate high-effective water-reducing agent and its preparation method |
| CN102898059A (en) * | 2012-11-01 | 2013-01-30 | 徐友娟 | High-performance sulfamic acid water reducing agent and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105585275A (en) * | 2015-12-24 | 2016-05-18 | 江苏百瑞吉新材料有限公司 | Concrete admixture for roads |
| CN114508234A (en) * | 2022-01-25 | 2022-05-17 | 中建三局集团有限公司 | Anti-crack construction method for basement concrete outer wall |
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