CN102659352A - Preparation method of super-retarded large-volume concrete and super-retarded ground pit concrete - Google Patents
Preparation method of super-retarded large-volume concrete and super-retarded ground pit concrete Download PDFInfo
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- CN102659352A CN102659352A CN2012101047415A CN201210104741A CN102659352A CN 102659352 A CN102659352 A CN 102659352A CN 2012101047415 A CN2012101047415 A CN 2012101047415A CN 201210104741 A CN201210104741 A CN 201210104741A CN 102659352 A CN102659352 A CN 102659352A
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Abstract
The invention discloses a preparation method of super-retarded large-volume concrete and super-retarded ground pit concrete. The preparation method comprises the following steps: taking 44.4-46.1% by mass of broken stone, 20.4-25.6% by mass of artificial sand, 5.7-11.0% by mass of mountain sand, 6.3-12.8% by mass of cement, 2.7-4.6% by mass of slag powder, 2.7-5.0% by mass of secondary coal ash, 6.9-7.5% by mass of water, adding 0.4-0.5% by mass of a sodium gluconate super-retarded additive, and stirring above materials to obtain concrete. The concrete with the coagulation time of 60h, the three day compressive strength of less than 3.5MPa and the 28 day strength which reaches design requirements is provided in the invention, and the slump loss of the concrete is fast, so 'piping' appearing during casting occlusion pile construction can be effectively prevented.
Description
Technical field
The present invention relates to concrete compounding process field.
Background technology
Ultra retarded concrete is a Japan in a kind of new concrete of coming out of development research at first in latter stage mid-1980s, and it can regulate time of coagulation and unlikely destruction concrete performance through admixture in a long time.Be mainly used in the mass concrete construction that needs continuously poured, control concrete time of coagulation to 120h, postpone time of coagulation as far as possible at 24h.And ultra retarded concrete Once you begin condenses, and later strength promptly develops very fast.General 28 days proof also can be a little more than normal concrete.The exploitation of ultra retarded concrete and effectively use; Can make concrete construction technology realize variation; And can solve concrete construction appearance " construction joint ", because the pause of concrete construction engineering, the concrete of construction in early stage and the concrete coagulating time of construction in later period are inconsistent; The strength development that causes is inconsistent, and the concrete uniformity descends.Build waterproof and the good high-leveled and difficult structure of impervious resistance to air loss, prolong the pouring of commerical ready-mixed concrete, make the workmen adjust working schedule easily, difficult problem such as avoid carrying on construction work at night.
Summary of the invention
The objective of the invention is to solve the deficiency that prior art exists, the concrete that is 60h a kind of time of coagulation, 3 days ultimate compression strength＜3.5MPa are provided, 28 days intensity reach the concrete of design requirements.
The objective of the invention is to realize through following technical scheme.
Ultra slow mass concrete and the concrete compound method of ultra slow foundation ditch; Press mass percent; Get the rubble of 44.4%-46.1%, the artificial sand of 20.4%-25.6%, the mountain sand of 5.7%-11.0%, the cement of 6.3%-12.8%, the slag powders of 2.7%-4.6%, the second class powered coal ash of 2.7%-5.0%, the water of 6.9%-7.5%; The ultra slow setting admixture that adds 0.4%-0.5% prepares concrete through stirring.
Ultra slow setting admixture according to the invention can adopt 6%～8.5% Sunmorl N 60S, 1.2%～4.16% sugared calcium, 19.84%～22.8% naphthalene series high-efficiency water-reducing agent by mass percent, adds 70% water, obtains through stirring; Said Sunmorl N 60S, sugared calcium, naphthalene series high-efficiency water-reducing agent are pulvis, and the purity of various pulvis is all greater than 99%.
Ultra slow mass concrete according to the invention and the concrete design of ultra slow foundation ditch time of coagulation, 3 days ultimate compression strength was less than 3.5MPa greater than 60 hours, and ultimate compression strength reached design requirements in 28 days.
The invention provides the concrete that is 60h a kind of time of coagulation, 3 days ultimate compression strength＜3.5MPa; 28 days intensity reach the concrete of design requirements; And ultra retarded concrete slump-loss of the present invention is fast, occurs in the time of can effectively having prevented cast interlock pile driving construction " piping ".Said " piping " is meant two piles of mutual interlock in B stake pore forming process, because the ultra retarded concrete of A stake does not condense as yet, also is in flow state, and the A pile concrete might pour in the B stake hole from A, B stake intersection.
Further set forth content of the present invention below in conjunction with embodiment.
Embodiment
Ultra slow mass concrete and the concrete compound method of ultra slow foundation ditch; Be by mass percent; Get the rubble of 44.4%-46.1%, the artificial sand of 20.4%-25.6%, the mountain sand of 5.7%-11.0%, the cement of 6.3%-12.8%, the slag powders of 2.7%-4.6%, the second class powered coal ash of 2.7%-5.0%, the water of 6.9%-7.5%; The ultra slow setting admixture that adds 0.4%-0.5% prepares concrete through stirring.
Said ultra slow setting admixture can directly be bought from market, also can oneself prepare.During preparation, can adopt 6%～8.5% Sunmorl N 60S, 1.2%～4.16% sugared calcium, 19.84%～22.8% naphthalene series high-efficiency water-reducing agent, add 70% water, obtain through stirring by mass percent; Said Sunmorl N 60S, sugared calcium, naphthalene series high-efficiency water-reducing agent are pulvis, and the purity of various pulvis is all greater than 99%.Sunmorl N 60S, sugared calcium, naphthalene series high-efficiency water-reducing agent all can directly be buied from market.High efficiency water reducing agent or the interior high efficiency water reducing agent commonly used of industry that credit admixture factory produces held in the Yunnan that can buy on the naphthalene series high-efficiency water-reducing agent available markets.
Ultra slow mass concrete of the present invention and the concrete design of ultra slow foundation ditch time of coagulation, 3 days ultimate compression strength was less than 3.5MPa greater than 60 hours, and ultimate compression strength can reach design requirements in 28 days.
Embodiment 1
Press mass percent, get 44.4% rubble, 20.4% artificial sand, 11.0% mountain sand, 7.5% cement, 4.6% slag powders, 4.6% second class powered coal ash, 7.0% water, add 0.5% ultra slow setting admixture, stir and prepared concrete in 35 seconds.Wherein, ultra slow setting admixture is pressed mass percent, gets 6% Sunmorl N 60S pulvis; 1.2% sugared calcium powder agent, 22.8% naphthalene series high-efficiency water-reducing agent pulvis holds the high efficiency water reducing agent that credit admixture factory produces like Yunnan; Add 70% water, with pulvis dissolve fully and stir after prepare.The concrete coagulating time of preparation is 64 hours, and solidifying back 3 days intensity is 2.2MPa, and 28 days intensity is 30.6MPa.
Embodiment 2
Press mass percent, get 44.4% rubble, 20.4% artificial sand, 11.0% mountain sand, 7.5% cement, 4.2% slag powders, 4.5% second class powered coal ash, 7.5% water, add 0.5% ultra slow setting admixture, stir and prepared concrete in 35 seconds.Press mass percent, get 6% Sunmorl N 60S pulvis, 4.16% sugared calcium powder agent, 21.5% naphthalene series high-efficiency water-reducing agent pulvis adds 70% water, stirs, and dissolves fully to pulvis, can prepare required ultra slow setting admixture.The concrete coagulating time of preparation is 67 hours, and solidifying back 3 days intensity is 1.8MPa, and 28 days intensity is 28.9MPa.
Embodiment 3
Press mass percent, get 45.0% rubble, 25.0% artificial sand, 8.5% mountain sand, 6.3% cement, 3.3% slag powders, 4.6% second class powered coal ash, 6.9% water, add 0.4% ultra slow setting admixture, stir and prepared concrete in 35 seconds.Press mass percent, get 6.66% Sunmorl N 60S pulvis, 4.16% sugared calcium powder agent, 19.84% naphthalene series high-efficiency water-reducing agent pulvis adds 70% water, dissolves pulvis fully, stirs, and can prepare required ultra slow setting admixture.The concrete coagulating time of preparation is 72 hours, and solidifying back 3 days intensity is 1.3MPa, and 28 days intensity is 23.2MPa.
Embodiment 4
Press mass percent, get 45.2% rubble, 25.2% artificial sand, 6.3% mountain sand, 7.9% cement, 3.0% slag powders, 4.2% second class powered coal ash, 7.5% water, add 0.4% ultra slow setting admixture, stir and prepared concrete in 35 seconds.Ultra slow setting admixture is pressed mass percent, gets 6.66% Sunmorl N 60S pulvis, 2.5% sugared calcium powder agent, and 20.84% naphthalene series high-efficiency water-reducing agent pulvis, 70% water dissolves pulvis fully, stirs, and promptly prepares.The concrete coagulating time of preparation is 78 hours, and solidifying back 3 days intensity is 2.3MPa, and 28 days intensity is 36.2MPa.
Embodiment 5
Press mass percent, get 45.4% rubble, 22.9% artificial sand, 5.7% mountain sand, 12.8% cement, 2.7% slag powders, 2.7% second class powered coal ash, 7.3% water, add 0.5% ultra slow setting admixture, stir and prepared concrete in 35 seconds.Press mass percent, get 7.5% Sunmorl N 60S pulvis, 2.5% sugared calcium powder agent, 20.0% naphthalene series high-efficiency water-reducing agent pulvis, the water of adding 70% dissolves pulvis fully after mixing, and stirs, and can promptly prepare required ultra slow setting admixture.Concrete coagulating time is 74 hours, and solidifying back 3 days intensity is 3.2MPa, and 28 days intensity is 45.2MPa.
Embodiment 6
Press mass percent, get 46.1% rubble, 25.6% artificial sand, 6.1% mountain sand, 7.3% cement, 3.3% slag powders, 3.7% second class powered coal ash, 7.5% water, add 0.4% ultra slow setting admixture, stir and prepared concrete in 35 seconds.Press mass percent, get 8.5% Sunmorl N 60S pulvis, 1.2% sugared calcium powder agent, 20.3% naphthalene series high-efficiency water-reducing agent pulvis, 70% water is mixed to and dissolves pulvis fully and stir, and can prepare required ultra slow setting admixture.The concrete coagulating time of preparation is 73 hours, and solidifying back 3 days intensity is 2.3MPa, and 28 days intensity is 33.4MPa.
The concrete of the inventive method preparation can be widely used in following field:
(1) concrete hot weather construction.But ultra retarded concrete can be used to prolong the tamping time, guarantees the workability of concrete in for some time.
(2) can be used for the large area concrete construction.Prevent the generation of " construction joint ".Adopt ultra retarded concrete, it is consistent that each construction surface concrete coagulating time is transferred, and employing is striden layer and vibrated." cold junction " that possibly occur in the time of just can eliminating pouring fully fully meets design requirement operating technique, quality.
(3) be used for mass concrete construction.Use the ultra retarded concrete can be effective, reduce the effect of hydration heat peak value, reduce hydration heat, reduce the temperature difference, suppress the fissured appearance of concrete temperature stress.
(4) be used for the cast of " piling wall " that the interlock of subway construction underground part foundation ditch spacing structure builds.Ultra retarded concrete requires concrete time of coagulation of sufficiently long, guaranteeing to form successive " piling wall " between two ultra retarded concrete stakes at interval, and guarantees that the early strength of ultra retarded concrete stake is low, and while 28d ultimate compression strength reaches design requirements.
Claims (3)
1. ultra slow mass concrete and the concrete compound method of ultra slow foundation ditch; It is characterized in that; Press mass percent; Get the rubble of 44.4%-46.1%, the artificial sand of 20.4%-25.6%, the mountain sand of 5.7%-11.0%, the cement of 6.3%-12.8%, the slag powders of 2.7%-4.6%, the second class powered coal ash of 2.7%-5.0%, the water of 6.9%-7.5%, add the ultra slow setting admixture of Sunmorl N 60S of 0.4%-0.5%, prepare concrete through stirring.
2. ultra slow mass concrete according to claim 1 and 2 and the concrete compound method of ultra slow foundation ditch; It is characterized in that; The ultra slow setting admixture of said Sunmorl N 60S can be by mass percent; Adopt 6%～8.5% Sunmorl N 60S, 1.2%～4.16% sugared calcium, 19.84%～22.8% naphthalene series high-efficiency water-reducing agent, add 70% water, obtain through stirring; Said Sunmorl N 60S, sugared calcium, naphthalene series high-efficiency water-reducing agent are pulvis, and the purity of various pulvis is all greater than 99%.
3. ultra slow mass concrete according to claim 1 and 2 and the concrete compound method of ultra slow foundation ditch; It is characterized in that; Said ultra slow mass concrete and the concrete design of ultra slow foundation ditch time of coagulation were greater than 60 hours; 3 days ultimate compression strength is less than 3.5MPa, and ultimate compression strength reached design requirements in 28 days.
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| CN2012101047415A CN102659352A (en) | 2012-04-11 | 2012-04-11 | Preparation method of super-retarded large-volume concrete and super-retarded ground pit concrete |
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| CN2012101047415A CN102659352A (en) | 2012-04-11 | 2012-04-11 | Preparation method of super-retarded large-volume concrete and super-retarded ground pit concrete |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103482919A (en) * | 2013-09-07 | 2014-01-01 | 安徽富强混凝土有限公司管桩分公司 | Formula for improving effective prestress of concrete tubular pile |
| CN103482918A (en) * | 2013-09-07 | 2014-01-01 | 安徽富强混凝土有限公司管桩分公司 | Formula for improving vertical bearing capacity of pile body structure of pipe pile and preparation method thereof |
| CN106517937A (en) * | 2016-11-01 | 2017-03-22 | 鞍钢房地产开发集团有限公司 | Pumping impervious super-retarding concrete and preparation method thereof |
| CN106977159A (en) * | 2017-05-08 | 2017-07-25 | 天津市滨涛混凝土有限公司 | Ultra-retardation concrete and preparation method thereof |
| CN111484295A (en) * | 2020-05-08 | 2020-08-04 | 江苏省水利科学研究院 | Construction method for preventing pier wall concrete temperature cracks |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1887775A (en) * | 2006-07-13 | 2007-01-03 | 内蒙古科技大学 | Efficient retarding and water reducing agent for concrete |
| CN102320790A (en) * | 2011-09-10 | 2012-01-18 | 云南建工集团有限公司 | Dongchuan river sand concrete |
-
2012
- 2012-04-11 CN CN2012101047415A patent/CN102659352A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1887775A (en) * | 2006-07-13 | 2007-01-03 | 内蒙古科技大学 | Efficient retarding and water reducing agent for concrete |
| CN102320790A (en) * | 2011-09-10 | 2012-01-18 | 云南建工集团有限公司 | Dongchuan river sand concrete |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103482919A (en) * | 2013-09-07 | 2014-01-01 | 安徽富强混凝土有限公司管桩分公司 | Formula for improving effective prestress of concrete tubular pile |
| CN103482918A (en) * | 2013-09-07 | 2014-01-01 | 安徽富强混凝土有限公司管桩分公司 | Formula for improving vertical bearing capacity of pile body structure of pipe pile and preparation method thereof |
| CN103482919B (en) * | 2013-09-07 | 2015-04-08 | 安徽富强混凝土有限公司管桩分公司 | Formula for improving effective prestress of concrete tubular pile |
| CN106517937A (en) * | 2016-11-01 | 2017-03-22 | 鞍钢房地产开发集团有限公司 | Pumping impervious super-retarding concrete and preparation method thereof |
| CN106977159A (en) * | 2017-05-08 | 2017-07-25 | 天津市滨涛混凝土有限公司 | Ultra-retardation concrete and preparation method thereof |
| CN106977159B (en) * | 2017-05-08 | 2019-03-01 | 天津市滨涛混凝土有限公司 | Ultra-retardation concrete and preparation method thereof |
| CN111484295A (en) * | 2020-05-08 | 2020-08-04 | 江苏省水利科学研究院 | Construction method for preventing pier wall concrete temperature cracks |
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