CN102491700B - Freezing process construction completing high-performance constant negative temperature concrete - Google Patents
Freezing process construction completing high-performance constant negative temperature concrete Download PDFInfo
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- CN102491700B CN102491700B CN 201110419801 CN201110419801A CN102491700B CN 102491700 B CN102491700 B CN 102491700B CN 201110419801 CN201110419801 CN 201110419801 CN 201110419801 A CN201110419801 A CN 201110419801A CN 102491700 B CN102491700 B CN 102491700B
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Abstract
The invention relates to concrete for use in construction industry, in particular to freezing process construction completing high-performance constant negative temperature concrete. The freezing process construction completing high-performance constant negative temperature concrete comprises water, cement, ground slag, fly ash, mineral activator, sand, broken stones, additive and antifreeze. Compared with the prior art, the concrete has the advantages that: the mineral activator which is prepared by using desulfurized gypsum and slaked lime as main ingredients can effectively activate the activities of the fly ash and the ground slag and improve the strength, compactness, antifreeze performance and the like of the concrete; dihydrate gypsum in the desulfurized gypsum, of which the dissolution rate compares that of natural dihydrate gypsum, can dissolve slowly after the concrete is added with water and stirred for 3 to 14 days; the SO4<2-> dissolved out combines with the mineral additive adopted in the invention constantly to form ettringite crystals; and after being inserted in a gel system, the ettringite crystals can increase the pressure strength and toughness of concrete.
Description
Technical field
The concrete that the present invention relates to use in building trade, specifically freezing process construction completing high-performance constant negative temperature concrete.
Background technology
freezing method is a kind of special reinforcement construction technology for underground works special construction and emergency work, increase along with the degree of depth and the complicacy of underground construction, subway tunnel is toward super dark, the development of super-large diameter direction, requirement to working security and structure durability is more and more higher, freezing process is as a robust techniques of guaranteeing underground construction safety, it uses more and more, especially use frequent especially in emergency work, because freezing process has adopted the circulating frozen system, construction environment is constant subzero temperature, and the part-structure shape is special, be difficult to after concrete placement manually vibrate, therefore concrete has been proposed permanent subzero temperature, the particular requirements such as self-compacting.
Freezing process belongs to the category of permanent negative temperature concrete with concrete, many researchs about negative temperature concrete are arranged both at home and abroad, but great majority are for naturally becoming the situation of subzero temperature (being winter low temperature), can be described as blank out for concrete correlative study under this specific artificial permanent subzero temperature of freezing method.In freezing process, concrete strength development speed direct relation quality safety and the progress of whole engineering, along with developing rapidly of underground works and freezing process, and improving constantly of requiring of structure durability, make and be applicable to freezing process, and it is extremely urgent to have a supporting high-performance constant negative temperature concrete of Self-leveling, self-compacting workability.
Summary of the invention
The present invention is for overcoming the deficiencies in the prior art, and the new concrete that makes has the self-compacting performance characteristics, and in the situation that permanent subzero temperature keeps certain ultimate compression strength, can be issued in the condition of freezing process-5 ℃ constant subzero temperature the requirement of C40P10.Greatly improving construction quality and safety coefficient aspect building operation especially freezing process.
For achieving the above object, design a kind of freezing process construction completing high-performance constant negative temperature concrete, comprise water, cement, slag powders, flyash, Mineral additive, sand, stone, admixture, frostproofer, it is characterized in that: in every cubic meter of concrete, each material content is: water: 175Kg; Cement: 460 Kg; Slag powders: 60 Kg; Flyash: 50 Kg; Mineral additive: 20 Kg; Fluidizer: 10Kg; Sand: 822 Kg; Stone: 806 Kg; Admixture: 7.8 Kg; Frostproofer: 30 Kg; Described cement is the ordinary Portland cement of 42.5P.0; Described flyash is that model is the flyash of FI; Described slag powders is that model is the slag powders of S95; Described admixture is high-efficiency water-reducing agent of poly-carboxylic acid; Described frostproofer is that model is the frostproofer of NF-5; Described sand is medium sand, and its fineness modulus is 2.5-2.7; The granularity of described stone is 5-10mm.
Described Mineral additive comprises desulfurated plaster and slaked lime, and both mix for 3:1 by weight percentage for it; And levigate to specific surface area greater than 400m2/Kg.
Described fluidizer comprises wilkinite and silicon ash, and both are the 4:1 mixing by weight percentage for it, and wherein wilkinite is sodium bentonite, and 95% by 200 mesh sieves.
A kind of preparation method of freezing process construction completing high-performance constant negative temperature concrete, described raw material adopts following processing step to be prepared from:
(1) take respectively various raw materials, with cement, flyash, slag powders, Mineral additive dry mixing to uniform state;
(2) then add sand, stone and carry out again dry mixing 30 seconds;
(3) admixture, frostproofer are added to the water carry out pre-mixing;
(4) etc. after the powder dry mixing finishes, add the mixing solutions of admixture, frostproofer in powder, uniform stirring 120 seconds gets described freezing process construction completing high-performance constant negative temperature concrete.
The present invention compares with prior art, with desulfurated plaster and the slaked lime Mineral additive as main ingredient, can effectively excite the activity of flyash and slag powders, improves the performances such as concrete intensity, degree of compactness, frost resistance.The main component of slaked lime is Ca (OH)
2, its introducing has increased the OH in the system
-Content, thus accelerate the aquation of complementary gelling material.Introduce appropriate desulfurated plaster, its main ingredient is dihydrate gypsum (CaSO
4.2H
2O), the dihydrate gypsum in desulfurated plaster is suitable with the dissolution rate of natural dihydrate gypsum, can add water at concrete and stir slowly dissolving in rear 3d-14d, dissolves the SO that
4 2-Constantly be combined with Minerals adulterant of the present invention, form ettringite, intert in gelling system, help to increase concrete ultimate compression strength and toughness.The combination of slaked lime and desulfurated plaster has synergistic effect, due to OH
-Concentration effect, when both ratios are appropriate, can make generating rate and the pattern of ettringite, and the speed of pozzolanic reaction, be controlled at one preferably in scope, favourable to concrete degree of compactness, toughness, and then improve frost resistance.Desulfurated plaster and slaked lime can also be brought into play particles filled effect in addition, strengthen mobility, the density of concrete grout.
In the present invention, fluidizer can improve concrete workability, impermeability.Wilkinite has high water swelling and good low permeability, and concrete anti-permeability performance is improved greatly; The microballon effect of silicon ash and ultra-fine grain effect can effectively strengthen concrete mobility, and the silicon ash has certain gelling material effect; The combination of wilkinite and silicon ash not only can improve concrete workability, also helps the raising of mechanical performance of concrete, anti-freezing property, weather resistance.Use the present invention can effectively improve concrete to the proportion of utilization of various trade wastes, have advantages of green low-carbon.
The present invention is applicable to that various structures, especially shape in freezing process are special, the concrete placement of the structure that is difficult to manually vibrate.
Embodiment
A kind of freezing process construction completing high-performance constant negative temperature concrete comprises water, cement, slag powders, flyash, Mineral additive, sand, stone, admixture, frostproofer, it is characterized in that: in every cubic meter of concrete, each material content is: water: 175Kg; Cement: 460 Kg; Slag powders: 60 Kg; Flyash: 50 Kg; Mineral additive: 20 Kg; Fluidizer: 10Kg; Sand: 822 Kg; Stone: 806 Kg; Admixture: 7.8 Kg; Frostproofer: 30 Kg; Described cement is the ordinary Portland cement of 42.5P.0; Described flyash is that model is the flyash of FI; Described slag powders is that model is the slag powders of S95; Described admixture is high-efficiency water-reducing agent of poly-carboxylic acid; Described frostproofer is that model is the frostproofer of NF-5; Described sand is medium sand, and its fineness modulus is 2.5-2.7; The granularity of described stone is 5-10mm.
Described Mineral additive comprises desulfurated plaster and slaked lime, and both mix for 3:1 by weight percentage for it; And levigate to specific surface area greater than 400m2/Kg.
Described fluidizer comprises wilkinite and silicon ash, and both are the 4:1 mixing by weight percentage for it, and wherein wilkinite is sodium bentonite, and 95% by 200 mesh sieves.
A kind of preparation method of freezing process construction completing high-performance constant negative temperature concrete, described raw material adopts following processing step to be prepared from:
(1) take respectively various raw materials, with cement, flyash, slag powders, Mineral additive dry mixing to uniform state;
(2) then add sand, stone and carry out again dry mixing 30 seconds;
(3) admixture, frostproofer are added to the water carry out pre-mixing;
(4) etc. after the powder dry mixing finishes, add the mixing solutions of admixture, frostproofer in powder, uniform stirring 120 seconds gets described freezing process construction completing high-performance constant negative temperature concrete.
The high-performance constant negative temperature concrete has high workability and full-bodied characteristics, and the interval of building of long period can not be arranged in architectural process, otherwise easily forms the sedimentation of pump line inner concrete, and concrete production, transportation and pumping need to have very strong continuity.
At first the high-performance constant negative temperature concrete before cast, is carried out the heat insulation work at cast position, adds the temperature that high-power sun lamp or electric blanket improve local environment.
In transportation, truck mixer need stir incessantly, turns soon 1 minute before batch turning, to guarantee concrete workability, promotes simultaneously concrete aquation to carry out.
The high-performance constant negative temperature concrete need strictly be carried out maintenance work after cast, with many high-power sun lamps, structure partial is heated, and after concrete strength increases up, can reduce gradually sun lamp quantity until cancel.
The high-performance constant negative temperature concrete need strictly be carried out maintenance work after cast, except normal indwelling concrete test block, set up maintaining test block with same condition, to understand the concrete strength growth pattern, guarantees job schedule and safety.
Claims (2)
1. a freezing process construction completing high-performance constant negative temperature concrete, comprise water, cement, slag powders, flyash, Mineral additive, sand, stone, admixture, frostproofer, it is characterized in that: in every cubic meter of concrete, each material content is: water: 175kg; Cement: 460 kg; Slag powders: 60 kg; Flyash: 50 kg; Mineral additive: 20 kg; Fluidizer: 10kg; Sand: 822 kg; Stone: 806 kg; Admixture: 7.8 kg; Frostproofer: 30 kg; Described cement is the ordinary Portland cement of 42.5P.O; Described flyash is that model is the flyash of FI; Described slag powders is that model is the slag powders of S95; Described admixture is high-efficiency water-reducing agent of poly-carboxylic acid; Described frostproofer is that model is the frostproofer of NF-5; Described sand is medium sand, and its fineness modulus is 2.5-2.7; The granularity of described stone is 5-10mm; Described Mineral additive comprises desulfurated plaster and slaked lime, and both mix for 3:1 by weight percentage for it; And levigate to specific surface area greater than 400m2/kg; Described fluidizer comprises wilkinite and silicon ash, and both are the 4:1 mixing by weight percentage for it, and wherein wilkinite is sodium bentonite, and 95% by 200 mesh sieves.
2. the preparation method of a freezing process construction completing high-performance constant negative temperature concrete is characterized in that adopting following processing step to be prepared from by the raw material described in claim 1:
(1) take respectively various raw materials, with cement, flyash, slag powders, Mineral additive dry mixing to uniform state;
(2) then add sand, stone and carry out again dry mixing 30 seconds;
(3) admixture, frostproofer are added to the water carry out pre-mixing;
After powder dry mixing end, add the mixing solutions of admixture, frostproofer in powder, uniform stirring 120 seconds gets described freezing process construction completing high-performance constant negative temperature concrete.
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| CN 201110419801 CN102491700B (en) | 2011-12-15 | 2011-12-15 | Freezing process construction completing high-performance constant negative temperature concrete |
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| CN 201110419801 CN102491700B (en) | 2011-12-15 | 2011-12-15 | Freezing process construction completing high-performance constant negative temperature concrete |
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| CN102491700B true CN102491700B (en) | 2013-06-12 |
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| CN102976692A (en) * | 2012-12-04 | 2013-03-20 | 武汉大学 | Ore-powder-doped high-performance shotcrete applicable to underground watertight oil cellars and preparation method thereof |
| CN103121829B (en) * | 2013-02-06 | 2016-03-16 | 柳州煜华科技有限公司 | Take industrial residue as the autoclaved lime-sand brick of raw material |
| CN103626449B (en) * | 2013-12-16 | 2015-11-11 | 天津工业大学 | A kind of frost-resistant concrete and preparation method thereof |
| CN104761275A (en) * | 2015-03-03 | 2015-07-08 | 孙德民 | New method for comprehensive treatment of waste desulfurized powder to produce assembled building energy saving and thermal insulation component |
| CN105297982B (en) * | 2015-10-14 | 2017-07-04 | 山东凝华建筑科技有限公司 | Laminated plate floor construction system and preparation method based on the prestress baseboard with truss |
| CN105218055B (en) * | 2015-10-14 | 2017-07-28 | 山东隆和节能科技股份有限公司 | Self-compaction no vibrated concrete and preparation method thereof |
| CN105178487B (en) * | 2015-10-14 | 2017-10-13 | 山东隆和节能科技股份有限公司 | Assembled laminated floor slab |
| CN105314936A (en) * | 2015-10-29 | 2016-02-10 | 廊坊荣盛混凝土有限公司 | Application of fly ash composite slag powder to concrete |
| CN106082822A (en) * | 2016-06-20 | 2016-11-09 | 安徽金丰新型建材有限公司 | A kind of concrete |
| CN107382220A (en) * | 2017-09-06 | 2017-11-24 | 陈毅忠 | A kind of frost-resistant concrete |
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| KR100875240B1 (en) * | 2007-09-19 | 2008-12-19 | 한국도로공사 | High performance concrete composition for constructing bridge slab integrated with pavement and bridge slab construction method using the same |
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| CN102276218A (en) * | 2011-05-20 | 2011-12-14 | 中国铁道科学研究院铁道建筑研究所 | Low negative temperature post-tensioned beam prestress pipeline mudjacking material |
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| CN101152977A (en) * | 2006-09-27 | 2008-04-02 | 盛天宝 | Profundity sterilization borehole face high-strength high-performance concrete |
| KR100875240B1 (en) * | 2007-09-19 | 2008-12-19 | 한국도로공사 | High performance concrete composition for constructing bridge slab integrated with pavement and bridge slab construction method using the same |
| CN101671151A (en) * | 2009-10-16 | 2010-03-17 | 上海隧道工程股份有限公司 | Concrete with high cracking resistance and preparation method thereof |
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