CN108929082A - A kind of lower shrinkage super high strength concrete - Google Patents
A kind of lower shrinkage super high strength concrete Download PDFInfo
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- CN108929082A CN108929082A CN201810731807.0A CN201810731807A CN108929082A CN 108929082 A CN108929082 A CN 108929082A CN 201810731807 A CN201810731807 A CN 201810731807A CN 108929082 A CN108929082 A CN 108929082A
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- concrete
- super high
- high strength
- water
- zeolite powder
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a kind of lower shrinkage super high strength concrete and its application methods.The concrete includes cementitious material and zeolite powder, the total 650~750kg/m of dosage of cementitious material3, the cementitious material includes cement, ultrafine slag and glass powder, silicon ash, and wherein cement accounting 60%~70%, ultrafine slag are 30%~40% with glass powder, silicon ash accounting, and proportions 1:1.5:1, the zeolite powder dosage control is in 250~350kg/m3.The concrete introduces pre- water suction zeolite powder as interior curing agent, partial gelation material and fine aggregate are substituted by a certain percentage, the super high strength concrete of 28 days compression strength 130MPa or more can be made under common curing condition, and there is good mobility and stick poly- property.Compared to common super high strength concrete, cracking risk is substantially reduced, and is suitably applied to deformation and the cracking fields such as demanding deck paving and the high-rise Super High beam column high to intensity requirement.
Description
Technical field
The invention belongs to building material technical fields, and in particular to a kind of lower shrinkage super high strength concrete, more particularly to it is mixed
The selection of relevant raw materials in solidifying soil, cementitious material system design, coarse-fine aggregate collocation.
Background technique
Have at present numerous scholars in conjunction with low water binder ratio, special mineral admixture and special aggregate make 28 days it is anti-
The super high strength concrete of Compressive Strength 120MPa or more, but since the gel material content of super high strength concrete is generally larger, early stage
Since the self-constriction that hydrated cementitious causes is very big.When concrete shrinkage, due to surrounding enviroment or the effect of contraction of connector, meeting
A certain amount of tensile stress is generated, when the tensile stress is more than the tensile strength of material, initially forms crack.Coagulation strong for superelevation
Soil, early-age shrinkage, especially self-constriction are one of the main reason for causing structure or component to crack greatly.In cracking state
Component significantly reduces structure entire load-carrying capacity, in addition, the appearance in crack is so that water and other chemical mediators, such as deicer salts,
It quickly passes through protective layer and is directly contacted with reinforcing bar, so as to cause steel bar corrosion, reinforced concrete structure deterioration.
It is particularly critical in order to reduce the contraction of super high strength concrete, compensating or slow down its internal humidity decline.Using pre-
Absorb water water storage element of the lightweight aggregate as inside concrete, and it is to reduce concrete that moisture is constantly provided during concrete is dry
A kind of effective way of self-constriction, but the partial size of pre- water suction lightweight aggregate is generally higher than 4mm, it is in super high strength concrete and uncomfortable
With.In addition, can also reduce the contraction of concrete using high hydroscopic resin, but because its addition can generate additional hole, lead to coagulation
Native strength reduction.Therefore, it is necessary to a kind of interior conserving material suitable for super high strength concrete is found, it can be in the strong coagulation of superelevation
Moisture is constantly provided in native drying process, reduces its self-constriction and dry contraction, and not will cause being substantially reduced for its intensity.
It has been investigated that substituting superelevation in right amount using pre- water suction calcined zeolite in the process for preparation of super high strength concrete
A part of cementitious material and fine aggregate in reinforced concrete, can be effectively reduced its contraction distortion.Although being mixed by force to superelevation both at home and abroad
The preparation of solidifying soil is it has been reported that but study the preparation technique of lower shrinkage super high strength concrete seldom.
Summary of the invention
The technical problem to be solved by the present invention is to prepare a kind of super high strength concrete of lower shrinkage, guaranteeing superelevation resistance to compression
While intensity, the contraction distortion of concrete is effectively reduced, reduces its cracking risk, is particularly suitable for application to deformation and cracking
The fields such as demanding road deck, deck paving.
The technical problem to be solved by the present invention is to what is be achieved through the following technical solutions:
A kind of lower shrinkage super high strength concrete, including cementitious material and zeolite powder, the total dosage of the cementitious material 650~
750kg/m3, the cementitious material includes cement, ultrafine slag and glass powder, silicon ash, and wherein cement accounting 60%~70%, surpasses
Thin slag and glass powder, silicon ash accounting are 30%~40%, and proportions 1:1.5:1, the zeolite powder dosage control is 250
~350kg/m3。
Further, the fineness of the ultrafine slag and glass powder is no less than 1250 mesh, and is no more than 2000 mesh.
Further, the SiO of the silicon ash2Content is more than 95%, specific surface area 20000m2/kg。
Further, the zeolite powder is calcined zeolite powder, maximum particle diameter 0.1-0.4mm.
Further, the concrete further includes polycarboxylate water-reducer, solid content 30kg/m3。
The application method of above-mentioned concrete, including
(1) between 0.15-0.25, the water consumption calculated for water-cement ratio subtracts the water-cement ratio of concrete for total water consumption
Go interior maintenance water；
(2) zeolite powder need to absorb water 3 days in advance；
(3) water-reducing agent dosage is finely tuned, controls the slump of concrete between 150mm~180mm.
The invention has the following advantages that
Super high strength concrete is conserved in zeolite of the present invention, using the cementitious material of optimization design, and by pre-
The interior maintenance of the calcined zeolite that absorbs water, while guaranteeing concrete superhigh intensity, realizes the drop of super high strength concrete contraction distortion
It is low, it efficiently solves the problems, such as that conventional ultra high reinforced concrete contraction distortion is big, reduces the cracking risk of structure or component, it is overall
Effect is ideal.
Detailed description of the invention
Fig. 1 is 130MPa control group shrinkage test result figure.
Fig. 2 is curing concrete shrinkage test result figure in 130MPa.
Specific embodiment
The present invention is further described with reference to the accompanying drawings and examples, but is not intended to limit the present invention.
Raw material: cement is 42.5 ordinary portland cement of Beijing Jinyu PO, density 3.1g/cm3；Test uses
Fine aggregate is natural river sand, fineness modulus 2.6；Coarse aggregate is broken granite, and partial size is 5~16mm；Silicon ash is that Beijing is difficult to understand
The production of Si Maite company, SiO2Content is more than 95%, specific surface area 20000m2/kg；Ultrafine slag is full of for Shandong pacifies environmentally friendly section
The production of skill Materials Co., Ltd, mesh number 1250；Water-reducing agent is the poly- carboxylic of Jiangsu Subotexin Material Co., Ltd's production
Sour water-reducing agent, solid content 30kg/m3；Glass powder uses the palladium powder of Hebei Lingshou County production, and average grain diameter is 2.5 μm；
Water is laboratory tap water.
Super high strength concrete match ratio (kg/m is conserved in 1 130MPa of table3)
The super high strength concrete workability of control group and interior maintenance proportion is preferable, and the slump is higher than 150mm.And compared to
Control group, interior maintenance super high strength concrete single cement consumption is smaller, only 420kg/m3.In addition, matching concrete for two
Shrinkage test result is listed.
2 130MPa control group of table and 28 days shrinkage test parameters of interior curing concrete
Data in contrast table, when 28 day age, compared to control group, curing concrete is in dry and sealing strip in 130MPa
Relative humidity improves under part, especially sealed test piece, and relative humidity improves 18.5%；In addition, the sealing examination of two proportion of comparison
The self-constriction of part test result (sealed test piece shrinkage value represents self-constriction), interior maintenance proportion reduces 36.1%, in conjunction with it is dry with
Sealed test piece result (dry to represent dry shrink with sealed test piece shrinkage difference value), dry shrink of interior maintenance proportion reduces
39.1%.
The present invention is using maintenance technology in pre- water suction zeolite, in conjunction with cement+silicon ash+ultrafine slag+glass powder compound adhesive
Gel material system has made the low super high strength concrete of early-age shrinkage especially self-constriction, has solved the strong coagulation of conventional ultra high
Native early-age shrinkage deforms big problem, makes lower shrinkage super high strength concrete using design method of the invention, technology refers to
It marks as follows:
(1) fresh concrete workability is good, and Forming Quality is high；
(2) 28 days compression strength of 100mm cube reaches 130MPa or more；
(3) compared to common super high strength concrete, the 28 days relative humidity of lower shrinkage super high strength concrete in the present invention is bright
Aobvious to improve, self-constriction and drying shrinkage deformation value reduce 35% or more
Technical solution of the present invention is described in detail in above-described embodiment.It is apparent that the present invention is not limited being retouched
The embodiment stated.Based on the embodiments of the present invention, those skilled in the art can also make a variety of variations accordingly, but appoint
What is equal with the present invention or similar variation shall fall within the protection scope of the present invention.
Claims (7)
1. a kind of lower shrinkage super high strength concrete, which is characterized in that including cementitious material and zeolite powder, the cementitious material includes
Cement, ultrafine slag, glass powder and silicon ash, wherein 60%~70wt% of cement accounting, ultrafine slag, glass powder and silicon ash accounting
For 30%~40wt%, the gel material content is 650~750kg/m3, the zeolite powder dosage is 250~350kg/m3。
2. concrete according to claim 1, which is characterized in that three's ratio of the ultrafine slag, glass powder and silicon ash
Example is 1:1.5:1.
3. concrete according to claim 1, which is characterized in that the fineness of the ultrafine slag and glass powder is no less than
1250 mesh, and it is no more than 2000 mesh.
4. concrete according to claim 1, which is characterized in that the SiO of the silicon ash2Content is more than 95%, specific surface area
For 20000m2/kg。
5. concrete according to claim 1, which is characterized in that the zeolite powder is calcined zeolite powder, and maximum particle diameter exists
Between 0.1-0.4mm.
6. concrete according to claim 1, which is characterized in that the concrete further includes polycarboxylate water-reducer, Gu
Content 30kg/m3。
7. the application method of lower shrinkage super high strength concrete described in claim 1 characterized by comprising
(1) for the water-cement ratio of concrete between 0.15-0.25, the water consumption calculated for water-cement ratio is in total water consumption subtracts
Conserve water；
(2) zeolite powder need to absorb water 3 days in advance；
(3) water-reducing agent dosage is finely tuned, controls the slump of concrete between 150mm~180mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810731807.0A CN108929082A (en) | 2018-07-05 | 2018-07-05 | A kind of lower shrinkage super high strength concrete |
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| CN201810731807.0A CN108929082A (en) | 2018-07-05 | 2018-07-05 | A kind of lower shrinkage super high strength concrete |
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| CN108929082A true CN108929082A (en) | 2018-12-04 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110963755A (en) * | 2019-10-14 | 2020-04-07 | 北京交通大学 | Adjustable internal curing technology for concrete |
| CN110981369A (en) * | 2019-12-27 | 2020-04-10 | 河北上善石油机械有限公司 | High-performance expansive prestressed concrete and preparation method thereof |
| CN111187017A (en) * | 2020-01-08 | 2020-05-22 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Porous active internal curing admixture |
| CN113716915A (en) * | 2021-08-19 | 2021-11-30 | 华新超可隆新型建材科技(黄石)有限公司 | Sprayed ultrahigh-performance concrete for corrosion prevention and reinforcement |
| CN115974466A (en) * | 2022-12-02 | 2023-04-18 | 中建三局集团有限公司 | Ultrahigh-strength concrete and preparation method thereof |
| CN116354648A (en) * | 2023-01-31 | 2023-06-30 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Method for preparing low-shrinkage high-strength concrete by adopting internal curing microcapsules |
| CN116514464A (en) * | 2023-04-27 | 2023-08-01 | 重庆交通大学 | Reflective cement mucilage and reflective semi-flexible pavement material |
| CN116640000A (en) * | 2023-05-31 | 2023-08-25 | 武汉楚天浩杨建材有限公司 | Undisturbed industrial gypsum-based light high-strength concrete and preparation method thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110963755A (en) * | 2019-10-14 | 2020-04-07 | 北京交通大学 | Adjustable internal curing technology for concrete |
| CN110981369A (en) * | 2019-12-27 | 2020-04-10 | 河北上善石油机械有限公司 | High-performance expansive prestressed concrete and preparation method thereof |
| CN111187017A (en) * | 2020-01-08 | 2020-05-22 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Porous active internal curing admixture |
| CN113716915A (en) * | 2021-08-19 | 2021-11-30 | 华新超可隆新型建材科技(黄石)有限公司 | Sprayed ultrahigh-performance concrete for corrosion prevention and reinforcement |
| CN115974466A (en) * | 2022-12-02 | 2023-04-18 | 中建三局集团有限公司 | Ultrahigh-strength concrete and preparation method thereof |
| CN115974466B (en) * | 2022-12-02 | 2024-04-02 | 中建三局集团有限公司 | Ultra-high-strength concrete and preparation method thereof |
| CN116354648A (en) * | 2023-01-31 | 2023-06-30 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Method for preparing low-shrinkage high-strength concrete by adopting internal curing microcapsules |
| CN116514464A (en) * | 2023-04-27 | 2023-08-01 | 重庆交通大学 | Reflective cement mucilage and reflective semi-flexible pavement material |
| CN116640000A (en) * | 2023-05-31 | 2023-08-25 | 武汉楚天浩杨建材有限公司 | Undisturbed industrial gypsum-based light high-strength concrete and preparation method thereof |
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Application publication date: 20181204 |