CN102276185A - Early strength type water reducing agent for precast concrete - Google Patents
Early strength type water reducing agent for precast concrete Download PDFInfo
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- CN102276185A CN102276185A CN201110176037A CN201110176037A CN102276185A CN 102276185 A CN102276185 A CN 102276185A CN 201110176037 A CN201110176037 A CN 201110176037A CN 201110176037 A CN201110176037 A CN 201110176037A CN 102276185 A CN102276185 A CN 102276185A
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Abstract
The invention discloses an early strength type water reducing agent for precast concrete. The early strength type water reducing agent comprises the following components by weight percent: 5.00-6.00% of polycarboxylic acid water reducing agent, 0.50-2.00% of inorganic lithium salt, 1.00-5.00% of inorganic sodium salt, 0.00-10.00% of inorganic calcium salt, 0.01-0.30% of deformer and the balance of filling material. The early strength type water reducing agent has the characteristics that the doped amount is low, the air bleeding is low, the water reduction is high, slump is well maintained, and the early strength is rapidly increased; and by utilizing the early strength type water reducing agent, the steam heating and maintenance of the precast concrete are shortened or avoided, thereby reducing the production cost of the precast concrete.
Description
Technical field
The present invention relates to the additives for building materials field, relate in particular to a kind of early-strength type water reducer that is used for precast concrete.
Background technology
In recent years, the construction of Important Project such as subway, the south water to north, transfering natural gas from the west to the east, Line for Passenger Transportation and on a large scale urban renewal have driven the fast development of cement concrete material, and directly cause the section of jurisdiction, the demand of precast concrete such as pile tube increases severely.With prestressed high-strength concrete pile (being called for short the PHC pile tube) is example, and national PHC pile tube output was 2,000 ten thousand m in 1998, and calendar year 2001 is 4,500 ten thousand m, reached 8,000 ten thousand m in 2003, reached 1.5 hundred million m in 2005, reach 2.5 hundred million m to 2007 annual production, as seen its tempo is fast.
At present, the water reducer that is used for precast concrete is mainly naphthalene water reducer, and it is low that this kind water reducer has air content, the advantage that gain in strength is fast, but adopt the concrete slump loss of naphthalene water reducer preparation fast, the finished product visual appearance is poor.
CN101200354A discloses a kind of preparation method of concrete super instant coagulant, it has used the growth of accelerating early strength up to organic accelerating component of the inorganic accelerating component of 35-55% and 5-10%, to promote concrete setting and harden quickly under the low temperature condition in the winter time, a large amount of uses of inorganic accelerating component in this kind hardening accelerator, can reduce water-reducing rate significantly, and then cause the diminishing amounts of components to rise, and then cause production cost to rise.
CN101289292A discloses a kind of early strength polycarboxylic acid high performance dehydragent, adopts acrylic acid or the like poly carboxylic acid series water reducer and accelerating component trolamine, Sodium Thiocyanate 99, nitrocalcite is composite obtains.This water reducer has that volume is little, water-reducing rate is high, alkali content is low, its intensity advantages of higher early; But owing to the high bleed performance of acrylic acid or the like poly carboxylic acid series water reducer in the system and the bleed retarding performance of trolamine, this product is not suitable for the production of concrete prefabricated element, especially adopts the production of heating curing concrete prefabricated element.
Summary of the invention
The purpose of this invention is to provide a kind of early-strength type water reducer that is used for precast concrete, this water reducer is the diminishing enhancement component with the polycarboxylate water-reducer, with inorganic lithium salt, inorganic sodium and inorganic calcium salt is accelerating component, reduce the air content of polycarboxylate water-reducer with defoamer, prepared by multiple function ingredients synergy have high diminishing, the early-strength type water reducer of high early strong, low gas content amount, solve the utilisation technology difficult problem of polycarboxylate water-reducer in prefabricated components such as PHC pile tube are produced.When early-strength type water reducer of the present invention is used for precast concrete production, can significantly improve concrete early strength, thereby shorten or exempt the steam heating maintenance.
The object of the present invention is achieved like this:
A kind of early-strength type water reducer that is used for precast concrete is characterized in that this early-strength type water reducer is made up of following substances in percentage by weight:
Polycarboxylate water-reducer 5.00～60.00%;
Inorganic lithium salt 0.50～2.00%;
Inorganic sodium 1.00～5.00%;
Inorganic calcium salt 0.00～10.00%;
The weighting material of defoamer 0.01～0.30% and surplus; Gross weight is in 100%; Wherein:
The weight-average molecular weight of described polycarboxylate water-reducer is 5000～120000;
Described inorganic lithium salt is one or more in Lithium Sulphate, lithium nitrate, Quilonum Retard, the lithium silicate;
Described inorganic sodium is one or more in sodium sulfate, SODIUMNITRATE, Sodium Nitrite, yellow soda ash, Sodium Thiocyanate 99, the water glass;
Described inorganic calcium salt is one or more in nitrocalcite, calcium nitrite, the calcium thiocyanide;
Described defoamer is one or more in polysiloxane defoamer, organic silicone oil defoamer, organic silicon modified by polyether defoamer, the polyethers defoamer;
Described weighting material is water, flyash or kaolin.
Described early-strength type water reducer volume be in the concrete mix total gelling material weight 0.4%～2.5%.
Embodiment
Embodiment 1
Take by weighing water 53.80kg and place reactor, under whipped state, add 1.00kg Lithium Sulphate and 5.00kg SODIUMNITRATE then successively, treat that inorganic salt dissolve the polycarboxylate water-reducer (VIVID-500(D type) that the back adds 40.00kg 40% solid content fully, weight-average molecular weight 31200, Shanghai Sanrui Polymer Material Co., Ltd. produces), add 0.20kg polysiloxane defoamer BYK-065 then, promptly obtain early-strength type water reducer of the present invention after continuing to stir, be designated as ESWR-1.
Embodiment 2
Under the room temperature, take by weighing water 38.40kg and place reactor, under whipped state, add 0.50kg lithium nitrate, 3.00kg Sodium Thiocyanate 99 and 8.00kg nitrocalcite then successively, treat that inorganic salt dissolve the polycarboxylate water-reducer (VIVID-500(A type) that the back adds 50.00kg 40% solid content fully, weight-average molecular weight 39000, Shanghai Sanrui Polymer Material Co., Ltd. produces), add 0.10kg organic silicone oil defoamer TEGO Antifoam 204 then, promptly obtain early-strength type water reducer of the present invention after continuing to stir, be designated as ESWR-2.
Embodiment 3
Under the room temperature, take by weighing water 32.85kg and place reactor, under whipped state, add 2.00kg Quilonum Retard and 5.00kg sodium sulfate then successively, treat that inorganic salt dissolve the polycarboxylate water-reducer (VIVID-500(C type) that the back adds 60.00kg 40% solid content fully, weight-average molecular weight 39000, Shanghai Sanrui Polymer Material Co., Ltd. produces), add 0.15kg organic silicon modified by polyether defoamer LM-110 then, promptly obtain early-strength type water reducer of the present invention after continuing to stir, be designated as ESWR-3.
Embodiment 4
Under the room temperature, take by weighing water 55.20kg and place reactor, under whipped state, add 1.50kg Lithium Sulphate and 3.00kg Sodium Thiocyanate 99 then successively, treat that inorganic salt dissolve polycarboxylate water-reducer (the allyl polyglycol Malaysia acids that the back adds 40.00kg 50% solid content fully, weight-average molecular weight 94500), add 0.30kg polyethers defoamer HT-606 then, promptly obtain early-strength type water reducer of the present invention after continuing to stir, be designated as ESWR-4.
Embodiment 5
Under the room temperature, take by weighing water 64.95kg and place reactor, under whipped state, add 1.00kg Lithium Sulphate, 0.50kg Quilonum Retard and 1.50kg sodium sulfate then successively, treat that inorganic salt dissolve polycarboxylate water-reducer (methacrylic acid and methoxy polyethylene glycol methacrylate-styrene polymer copolymer analog that the back adds 32.00kg 40% solid content fully, weight-average molecular weight 94500), add 0.05kg organic silicon modified by polyether defoamer LM-110 then, promptly obtain early-strength type water reducer of the present invention after continuing to stir, be designated as ESWR-5.
Embodiment 6
Under the room temperature, take by weighing 80.0g powder polycarboxylic acids water reducing agent (trade mark SD-600, weight-average molecular weight 31000, Shanghai Sanrui Polymer Material Co., Ltd.'s production), 10.0g lithium silicate, 20.0g water glass, 20.0g calcium nitrite and 2.0g organic silicon modified by polyether class powder defoamer SXP-01 place 2L high-speed mixer mixing 2-5 minute, adding 868.0g flyash then continues to mix, promptly obtain early-strength type water reducer of the present invention, be designated as ESWR-6.
Embodiment 7
Under the room temperature, take by weighing 150.0g powder polycarboxylic acids water reducing agent (trade mark SD-601, weight-average molecular weight 38200, Shanghai Sanrui Polymer Material Co., Ltd.'s production), 5.0g lithium nitrate, 30.0g Sodium Thiocyanate 99,50.0g nitrocalcite and 1.0g organic silicon modified by polyether class powder defoamer SXP-01 place 2L high-speed mixer mixing 2-5 minute, adding 764.0g flyash then continues to mix, promptly obtain early-strength type water reducer of the present invention, be designated as ESWR-7.
Embodiment 8
Under the room temperature, take by weighing 180.0g powder polycarboxylic acids water reducing agent (trade mark SD-600, weight-average molecular weight 31000, Shanghai Sanrui Polymer Material Co., Ltd.'s production), 20.0g Quilonum Retard, 20.0g sodium sulfate, 30.0g water glass, 20.0g calcium thiocyanide and 0.5g organic silicon modified by polyether class powder defoamer SXP-01 place 2L high-speed mixer mixing 2-5 minute, adding the 729.5g ultrafine kaolin then continues to mix, promptly obtain early-strength type water reducer of the present invention, be designated as ESWR-8.
Embodiment 9
Under the room temperature, take by weighing 180.0g powder polycarboxylic acids water reducing agent (trade mark 225P, weight-average molecular weight 32800, sika company provides), 15.0g Lithium Sulphate, 20.0g yellow soda ash, 30.0g calcium thiocyanide and 3.0g organic silicon modified by polyether class powder defoamer SXP-01 place 2L high-speed mixer mixing 2-5 minute, adding the 752.0g ultrafine kaolin then continues to mix, promptly obtain early-strength type water reducer of the present invention, be designated as ESWR-9.
Comparative example 1
Take by weighing water 59.80kg and place reactor, the polycarboxylate water-reducer (VIVID-500(D type) that under whipped state, adds 40.00kg 40% solid content then successively, weight-average molecular weight 31200, Shanghai Sanrui Polymer Material Co., Ltd. produces), add 0.20kg polysiloxane defoamer BYK-065 then, promptly obtain the comparative example polycarboxylate water-reducer after continuing to stir, be designated as WR-1.
Early-strength type water reducer ESWR-1～ESWR-9, comparative example polycarboxylate water-reducer WR-1 among the above embodiment and the commercially available used naphthalene water reducer NSF-00 of precast concrete are detected according to GB8076-2008 " cement water reducing agent ", and water-reducing rate, air content and ultimate compression strength the results are shown in Table 1.
The performance test results of the various water reducers of table 1
With early-strength type water reducer such as ESWR-1, the ESWR-2 of embodiment of the invention preparation, ESWR-3, ESWR-7, ESWR-8 and comparative example water reducer WR-1, the used naphthalene water reducer NSF-00 of precast concrete be spiked among the concrete according to the prestressed concrete proportioning, the initial slump of test fresh concrete, the slump of 30min, and moulding test block.According to the maintenance pattern of prestressed concrete, carry out atmospheric steam curing, maintenance finishes the back demoulding, and the part test block enters autoclave and carries out autoclave curing in company with the PHC pile tube, and another part test block places among the environment, carries out autotrophy to 7d, and test result sees Table 2.Testing used cement is Tongling conch P. II .52.5, and fineness modulus is 2.7 natural river sand, the rubble of 5-20mm, and proportioning is: C:S:G:W=480:657:1119:130.
The application performance test result of the various water reducers of table 2 in the PHC pile tube
By test-results as can be seen: early-strength type water reducer of the present invention has better slump hold facility than naphthalene water reducer; Steam intensity all far above Comparative Examples water reducer and commercially available naphthalene water reducer through demoulding strength behind the atmospheric steam curing and pressure; And adopt the concrete strength of atmospheric steam curing+7 day natural curing also to reach more than the 85MPa, satisfy the pile tube requirement of strength of dispatching from the factory.Therefore, use early-strength type water reducer of the present invention can shorten the time of autoclave or exempt this part maintenance, when reducing production costs, also can guarantee the quality of prestressed concrete pipe pile.
Claims (2)
1. early-strength type water reducer that is used for precast concrete is characterized in that this early-strength type water reducer is made up of following substances in percentage by weight:
Polycarboxylate water-reducer 5.00～60.00%;
Inorganic lithium salt 0.50～2.00%;
Inorganic sodium 1.00～5.00%;
Inorganic calcium salt 0.00～10.00%;
The weighting material of defoamer 0.01～0.30% and surplus; Gross weight is in 100%; Wherein:
The weight-average molecular weight of described polycarboxylate water-reducer is 5000～120000;
Described inorganic lithium salt is one or more in Lithium Sulphate, lithium nitrate, Quilonum Retard, the lithium silicate;
Described inorganic sodium is one or more in sodium sulfate, SODIUMNITRATE, Sodium Nitrite, yellow soda ash, Sodium Thiocyanate 99, the water glass;
Described inorganic calcium salt is one or more in nitrocalcite, calcium nitrite, the calcium thiocyanide;
Described defoamer is one or more in polysiloxane defoamer, organic silicone oil defoamer, organic silicon modified by polyether defoamer, the polyethers defoamer;
Described weighting material is water, flyash or kaolin.
2. early-strength type water reducer as claimed in claim 1, it is characterized in that described early-strength type water reducer volume be in the concrete mix total gelling material weight 0.4～2.5%.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103482915A (en) * | 2013-09-07 | 2014-01-01 | 安徽富强混凝土有限公司管桩分公司 | Formula and manufacturing method of corrosion resistant concrete tubular pile |
| CN103613319A (en) * | 2013-11-08 | 2014-03-05 | 安徽省阜南绿原化工有限公司 | Green and environment-friendly plasticizer |
| CN105130269A (en) * | 2015-08-21 | 2015-12-09 | 大连建科北方化学有限公司 | High-water-reduction high-early-strength type polycarboxylic acid water reducing agent and pyrogen-free preparation method thereof |
| CN105293974A (en) * | 2015-12-07 | 2016-02-03 | 广州大学 | Concrete compound super early strength agent and use method thereof |
| CN106007472A (en) * | 2016-05-24 | 2016-10-12 | 十九冶成都建设有限公司 | Composite water reducing agent for slag powder/rock powder high-content double-doped concrete |
| CN106007452A (en) * | 2016-05-17 | 2016-10-12 | 福建建工建材科技开发有限公司 | Preparation method of early strength type high-performance polycarboxylic acid water reducing agent |
| CN106630728A (en) * | 2016-09-07 | 2017-05-10 | 南京凯盛国际工程有限公司 | Blending method for early-strength water-reducing agent used for concrete |
| CN106746892A (en) * | 2016-12-27 | 2017-05-31 | 陕西友邦新材料科技有限公司 | A kind of compounding poly carboxylic acid series water reducer based on steam-curing concrete and preparation method thereof |
| CN107555829A (en) * | 2017-08-14 | 2018-01-09 | 山西格瑞特建筑科技股份有限公司 | A kind of nucleus type for concrete promotees solidifying early strength agent and preparation method thereof |
| CN109231876A (en) * | 2018-10-11 | 2019-01-18 | 济南大学 | A kind of early strong viscosity reduction type additive of pretensioned-prestressed tube pile concrete |
| CN114516732A (en) * | 2022-03-15 | 2022-05-20 | 江苏国胶新材料有限公司 | Method for preparing early strength type water reducing agent based on waste water recycling |
| CN115521089A (en) * | 2022-10-13 | 2022-12-27 | 临沂海螺新材料科技有限公司 | High-adaptability machine-made sand concrete water reducing agent and preparation method thereof |
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| CN101921083A (en) * | 2010-08-19 | 2010-12-22 | 上海固佳化工科技有限公司 | Ester-ether mixed ultra high early strength poly-carboxylic high-performance water reducer and preparation method thereof |
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| CN101157537A (en) * | 2007-08-02 | 2008-04-09 | 铁道科学研究院铁道建筑研究所 | Rapid-hardening self-leveling mortar material |
| CN101289292A (en) * | 2008-06-13 | 2008-10-22 | 北京工业大学 | Early strength polycarboxylic acid high performance dehydragent and method for preparing same |
| CN101921083A (en) * | 2010-08-19 | 2010-12-22 | 上海固佳化工科技有限公司 | Ester-ether mixed ultra high early strength poly-carboxylic high-performance water reducer and preparation method thereof |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103482915A (en) * | 2013-09-07 | 2014-01-01 | 安徽富强混凝土有限公司管桩分公司 | Formula and manufacturing method of corrosion resistant concrete tubular pile |
| CN103613319A (en) * | 2013-11-08 | 2014-03-05 | 安徽省阜南绿原化工有限公司 | Green and environment-friendly plasticizer |
| CN105130269A (en) * | 2015-08-21 | 2015-12-09 | 大连建科北方化学有限公司 | High-water-reduction high-early-strength type polycarboxylic acid water reducing agent and pyrogen-free preparation method thereof |
| CN105130269B (en) * | 2015-08-21 | 2017-05-10 | 大连建科北方化学有限公司 | High-water-reduction high-early-strength type polycarboxylic acid water reducing agent and pyrogen-free preparation method thereof |
| CN105293974A (en) * | 2015-12-07 | 2016-02-03 | 广州大学 | Concrete compound super early strength agent and use method thereof |
| CN106007452B (en) * | 2016-05-17 | 2018-05-04 | 福建建工建材科技开发有限公司 | A kind of preparation method of early strength polycarboxylic acid high performance dehydragent |
| CN106007452A (en) * | 2016-05-17 | 2016-10-12 | 福建建工建材科技开发有限公司 | Preparation method of early strength type high-performance polycarboxylic acid water reducing agent |
| CN106007472A (en) * | 2016-05-24 | 2016-10-12 | 十九冶成都建设有限公司 | Composite water reducing agent for slag powder/rock powder high-content double-doped concrete |
| CN106630728A (en) * | 2016-09-07 | 2017-05-10 | 南京凯盛国际工程有限公司 | Blending method for early-strength water-reducing agent used for concrete |
| CN106746892A (en) * | 2016-12-27 | 2017-05-31 | 陕西友邦新材料科技有限公司 | A kind of compounding poly carboxylic acid series water reducer based on steam-curing concrete and preparation method thereof |
| CN106746892B (en) * | 2016-12-27 | 2019-08-06 | 陕西友邦新材料科技有限公司 | A kind of compounding poly carboxylic acid series water reducer and preparation method thereof based on steam-curing concrete |
| CN107555829A (en) * | 2017-08-14 | 2018-01-09 | 山西格瑞特建筑科技股份有限公司 | A kind of nucleus type for concrete promotees solidifying early strength agent and preparation method thereof |
| CN109231876A (en) * | 2018-10-11 | 2019-01-18 | 济南大学 | A kind of early strong viscosity reduction type additive of pretensioned-prestressed tube pile concrete |
| CN114516732A (en) * | 2022-03-15 | 2022-05-20 | 江苏国胶新材料有限公司 | Method for preparing early strength type water reducing agent based on waste water recycling |
| CN115521089A (en) * | 2022-10-13 | 2022-12-27 | 临沂海螺新材料科技有限公司 | High-adaptability machine-made sand concrete water reducing agent and preparation method thereof |
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