CN107265969A - Slightly expanded concrete - Google Patents
Slightly expanded concrete Download PDFInfo
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- CN107265969A CN107265969A CN201710381418.5A CN201710381418A CN107265969A CN 107265969 A CN107265969 A CN 107265969A CN 201710381418 A CN201710381418 A CN 201710381418A CN 107265969 A CN107265969 A CN 107265969A
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- concrete
- slightly expanded
- expanded concrete
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Classifications
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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
Abstract
The present invention relates to a kind of slightly expanded concrete, it is characterized in that：In terms of mass fraction, its raw material includes following components：265 270 parts of cement, 168 173 parts of water, 725 730 parts of sand, 1,000 1010 parts of rubble, 75 85 parts of miberal powder, 75 80 parts of flyash, 10.00 10.50 parts of polycarboxylate water-reducer, 36 38 parts of UEA I types swelling agent.It is produced without structural cracks, improves the resistance to overturning of concrete structure.
Description
Technical field
The present invention relates to concrete material technical field, in particular, it is related to a kind of slightly expanded concrete.
Background technology
With the continuous quickening of Urbanization in China, urban population quantity has begun to rise sharply, and skyscraper is made
Increasingly favored for the construction style that can accommodate a great deal of resident by people, in building trade, overlength coagulation
Soil is as one of material mainly applied in Building Construction, and its concrete component is that the main load of building structure is held
Carry the component of power.
It is well known that ordinary reinforced concrete is in aquation knot hard process, concrete shrinkage cause in structure reinforcing bar by
Compression, concrete are by tension, and already present stress state causes structure easily to produce crack in this structure；Concrete
Because hydration reaction produces substantial amounts of heat and raises concrete structure internal temperature in casting process, the inside and outside temperature of structure
Difference is excessive to cause structural concrete to ftracture.Slightly expanded concrete is a certain amount of swollen by being filled in normal concrete
Swollen dose, concrete itself is produced the expansion of appropriateness, under reinforcing bar and other constraintss, produce necessarily chemical pre-stressed
(seif-citing rate), so as to compensate contraction, alleviates the concrete of cracking.
When concrete is expanded, concrete compression stress, reinforcing bar tension stress；When concrete shrinkage or cooling shrinkage
When, the prestressing force of concrete, the pre-tensile stress of reinforcing bar can all discharge, the contraction of compensating concrete, it is to avoid produce crack.
With the fast development of Building Trade in China, Overlong Concrete Structure is widely used in architectural engineering,
In modern construction, occupy critical role, to Overlong Concrete Structure in building construction process in industry and civil buildings
In be easiest to problem appear to is that structural cracks, because concrete tensile strength itself is far below compression strength, in concrete dry
Contracting or during by temperature change shrinkage, the concrete component of overlength easily produces crack.
The content of the invention
It is an object of the invention to provide a kind of slightly expanded concrete, it is produced without structural cracks, improves concrete structure
Resistance to overturning.
The present invention above-mentioned purpose technical scheme is that：A kind of slightly expanded concrete, with quality
Number meter, its raw material includes following components：265-270 parts of cement, 168-173 parts of water, 725-730 parts of sand, rubble 1000-1010
Part, 75-85 parts of miberal powder, 75-80 parts of flyash, 10.00-10.50 parts of polycarboxylate water-reducer, 36-38 parts of UEA-I type swelling agents.
By using above-mentioned technical proposal, the self waterproofing root problem to be solved of concrete is exactly improve concrete close
Reality, the shrinkage cracking for preventing concrete, and concrete science compatibility of the present invention, its micro-expansibility can just disclosure satisfy that in super
Application in long concrete structure construction, will not occur because expansion rate is less than normal, and cause compensation contractility deficiency is seamless to apply
The problem of work is difficult to, will not also occur because expansion rate is excessive, and cause have what is significantly influenceed to ask on concrete strength
Topic so that concrete produces the dry contraction after the heat of hydration and solidification, that is, produced deformation of expanding with heat and contract with cold in process of setting
Be compressed to it is minimum, and then solve Overlong Concrete Structure produce crack the problem of.
Preferably, laureth sulfuric ester sodium salt and four polyethyleneglycols month of its raw material also including 8-9 parts by weight
The mixture of osmanthus ether.
By using above-mentioned technical proposal, admixture laureth sulfuric ester sodium salt and four polyethyleneglycol bay ethers are not
The limited expansion rate of concrete of the present invention can be influenceed, but can substantially lower the limitation contract with dry rate of concrete of the present invention, further
The compatibility of the present invention is optimized, the generation of structural cracks is reduced.Porous when this is due to concrete, fragile material, in drying shrinkage, cold
Shrinkage stress is produced in the presence of contracting can cause concrete cracking, and concrete is lost self waterproofing function.
Preferably, the weight ratio of the laureth sulfuric ester sodium salt and four polyethyleneglycol bay ethers is 1:1-2.
By using above-mentioned technical proposal, optimize concrete incorporation laureth sulfuric ester sodium salt of the present invention and four and gather
The proportioning of ethylene glycol list bay ether, lowers the limitation contract with dry rate of concrete of the present invention, reduces for Overlong Concrete Structure construction
Concrete structure crack generation.
Preferably, the weight ratio of the laureth sulfuric ester sodium salt and four polyethyleneglycol bay ethers is 1:1.5.
By using above-mentioned technical proposal, optimize concrete incorporation laureth sulfuric ester sodium salt of the present invention and four and gather
The proportioning of ethylene glycol list bay ether, lowers the limitation contract with dry rate of concrete of the present invention, reduces for Overlong Concrete Structure construction
Concrete structure crack generation.
Preferably, the cement is P.042.5R portland cement.
By using above-mentioned technical proposal, cement is low compared with the stable, heat of hydration.
Preferably, sand in the Sha Wei II areas, modulus of fineness is 2.7.
Preferably, the rubble is 5-25mm continuous grading rubbles.
Preferably, the flyash is II grades of flyash of F classes, and it is 19.5% that 45 μm of square hole screens, which tail over fineness,.
By using above-mentioned technical proposal：Flyash mineral admixture has " active effect ", " interfacial effect ", " micro- to fill out
Many comprehensive effects such as effect " and " diminishing effect ".Flyash mineral admixture can not only improve rheological property, reduce aquation
Heat, reduces slump-loss, can also improve the pore structure and mechanical property of concrete structure, improves later strength and durability
Preferably, the miberal powder is S95 grades, and 28 days activity are 101%.
By using above-mentioned technical proposal, miberal powder has " active effect ", " interfacial effect ", " micro- to fill out effect " and " diminishing
Many comprehensive effects such as effect ".The mineral admixtures such as miberal powder can not only improve rheological property, reduce the heat of hydration, and reduction collapses
Degree loss, can also improve the pore structure and mechanical property of concrete structure, improve later strength and durability.
Compared with prior art, the invention has the advantages that：
1st, it is produced without structural cracks, improves the resistance to overturning of concrete structure.
2nd, admixture laureth sulfuric ester sodium salt and four polyethyleneglycol bay ethers can't influence concrete of the present invention
Limited expansion rate, but can substantially lower the limitation contract with dry rate of concrete of the present invention, further optimize the compatibility of the present invention,
Reduce the generation of structural cracks.Porous when this is due to concrete, fragile material, produces contraction in the presence of drying shrinkage, shrinkage
Stress can cause concrete cracking, and concrete is lost self waterproofing function.
3rd, the weight ratio of laureth sulfuric ester sodium salt and four polyethyleneglycol bay ethers is 1:, can be further when 1.5
The proportioning of concrete incorporation laureth sulfuric ester sodium salt of the present invention and four polyethyleneglycol bay ethers is optimized, lowers this hair
The limitation contract with dry rate of bright concrete, reduces the generation for the concrete structure crack constructed for Overlong Concrete Structure.
Embodiment
The present invention is described in further detail with reference to embodiments.It should be understood that described in the embodiment of the present invention
Preparation method is only used for the explanation present invention, rather than limitation of the present invention, to this hair under the concept thereof of the present invention
The simple modifications of bright preparation method belong to the scope of protection of present invention.
Concrete of the present invention has micro-expansibility energy, and its limited expansion rate is designed and set up extremely important, and expansion rate is less than normal,
Then compensation contractility is not enough, and jointless construction is difficult to, and expansion rate is excessive, there is obvious influence on concrete strength.It is micro- swollen
The design of swollen concrete, mainly mixes appropriate additive, additive in the proportioning of concrete so that concrete is in solidification
During produce and dry contraction after the heat of hydration and solidification, that is, the alternating compression produced by expanding with heat and contract with cold is to a kind of minimum structure
Think, in the design of whole concrete proportioning, inventor has carried out thin in terms of selection cement type, additive and proportioning
The research and analysis of cause, finally develop the concrete for being suitable for Overlong Concrete Structure construction.
The raw material sources of table 1
| Raw material | Manufacturer |
| Cement | Hebei Yan Xin cement plants |
| Sand | Laishui County, Hebei, China sandstone factory |
| Rubble | Beijing Yulin Lime Factory |
| Flyash | The happy and auspicious flyash processing factory in three rivers |
| Miberal powder | Katyuan building materials Co., Ltd of Sanhe City Xingda |
| Polycarboxylate water-reducer | Beijing Rayleigh additive factory |
| UEA-I type swelling agents | Tianjin Bao Ming architecture engineering materials Co., Ltd |
| Laureth sulfuric ester sodium salt | The magnificent mutually beneficial biochemical industry Co., Ltd in Beijing |
| Four polyethyleneglycol bay ethers | Tianjin benefit Ke Side Science and Technology Ltd.s |
First, embodiment and comparative example are made
Composition table (the unit of the embodiment one to nine of table 2：Kg)
Composition table (the unit of the comparative example one to two of table 3：Kg)
| Component | Comparative example one | Comparative example two |
| Cement | 266 | 266 |
| Sand | 729 | 729 |
| Rubble | 1007 | 1007 |
| Flyash | 76 | 76 |
| Miberal powder | 80 | 80 |
| Polycarboxylate water-reducer | 10.10 | 10.10 |
| UEA-I type swelling agents | 37 | 37 |
| Laureth sulfuric ester sodium salt | 0 | 3.6 |
| Four polyethyleneglycol bay ethers | 5.4 | 0 |
| Water | 170 | 170 |
Each embodiment and each comparative example are adopted and are prepared with the following method.
Each material metering, sand, stone, cement, admixture, water, additive metering, feeding stirring discharges into agitator truck
Transport (continuing to stir) is homogenized, and job site enters pump and poured.Wherein committed step is stirring and transports：Prolong 1. should be noted that during stirring
Long mixing time to 90 seconds to ensure that each component is fully homogenized so that the swelling agent during ensureing concrete hydrating is at each position
Even inflation；2. casting process answers vibration compacting, reducing concrete plastic deformation, (this is construction precautions, is not made herein
Discuss)；3. strengthening moisture-keeping maintaining, it should be no less than 14 days, its expansion character is realized to ensure the abundant aquation of swelling agent, so that
Offset the volume shrinkage mass of binder materials aquation.
2nd, the detection of properties is carried out to each embodiment and each comparative example
Workability of concrete is with reference to GB/T50080-2016《Standard for test methods of properties of ordinary concrete mixture》Carry out.
Intensity test is with reference to GB/T50081-2002《Normal concrete mechanical test method》Carry out.
Limited expansion rate and limitation contract with dry rate test are with reference to GB50119-2013《Technical code for application of admixture in concrete》
Carry out.
The microdilatancy control situation of the embodiment one to eight of table 4 and the concrete of comparative example one to two
It can be seen from the testing result of table 4, mix the concrete of the UEA-I type swelling agents microdilatancy effect in 7 days and play preferable, after
Phase expansion character is stable, bounces back in atmosphere small.This is due to that super-long structural is easiest to asking for appearance in building construction process
Topic is structural cracks, and this is due primarily to the temperature produced by the heat of hydration that cement in mass concrete discharges in hydration reaction
Degree change and the collective effect of concrete shrinkage, can produce larger temperature stress and shrinkage stress.UEA-I types swelling agent is mixed
After into concrete component, appropriate expansion is produced in concrete, the seif-citing rate produced under the synergy of reinforcing bar is offset, mended
The shrinkage stress that concrete is produced by drying shrinkage and shrinkage is repaid, simultaneously because the microdilatancy produced improves the closely knit of concrete
Degree.
When UEA-I types swelling agent is individually combined four polyethyleneglycol bay ether, microdilatancy coagulation of the present invention is improved on the contrary
The limitation contract with dry rate of soil, and UEA-I types swelling agent individually compound four polyethyleneglycol bay ether when, to microdilatancy coagulation of the present invention
The limitation contract with dry rate of soil does not have any influence.UEA-I types swelling agent is combined laureth sulfuric ester sodium salt, four poly- second two simultaneously
After alcohol list bay ether, the limited expansion rate of concrete of the present invention is not influenceed, but it can have been better controled in air
In retraction, reduce the limitation contract with dry rate of slightly expanded concrete of the present invention.Therefore, laureth sulfuric ester sodium salt and four gathers
The limitation contract with dry rate that ethylene glycol list bay ether can reduce slightly expanded concrete of the present invention has the effect cooperateed with, and both lack one not
Can.
The microdilatancy control situation of the embodiment one to eight of table 5 and the concrete of comparative example one to two
It can be seen from the testing result of table 5, it can be carried when laureth sulfuric ester sodium salt, four polyethyleneglycol bay ethers compounding
The intensity of the high present invention, both are indispensable.
Claims (9)
1. a kind of slightly expanded concrete, it is characterised in that in terms of mass fraction, its raw material includes following components：Cement 265-270
Part, 168-173 parts of water, 725-730 parts of sand, 1000-1010 parts of rubble, 75-85 parts of miberal powder, 75-80 parts of flyash, polycarboxylic acids subtracts
10.00-10.50 parts of aqua, 36-38 parts of UEA-I type swelling agents.
2. slightly expanded concrete according to claim 1, it is characterised in that its raw material also includes the bay of 8-9 parts by weight
The mixture of alcohol polyether thiourea sodium salt and four polyethyleneglycol bay ethers.
3. slightly expanded concrete according to claim 2, it is characterised in that the laureth sulfuric ester sodium salt and four
The weight ratio of polyethyleneglycol bay ether is 1:1-2.
4. slightly expanded concrete according to claim 3, it is characterised in that the laureth sulfuric ester sodium salt and four
The weight ratio of polyethyleneglycol bay ether is 1:1.5.
5. slightly expanded concrete according to claim 1, it is characterised in that the cement is P.042.5R silicate cement
Mud.
6. slightly expanded concrete according to claim 1, it is characterised in that sand in the Sha Wei II areas, modulus of fineness is
2.7。
7. slightly expanded concrete according to claim 1, it is characterised in that the rubble is that 5-25mm continuous gradings are broken
Stone.
8. slightly expanded concrete according to claim 1, it is characterised in that the flyash is II grades of flyash of F classes, 45
It is 19.5% that μm square hole screen, which tails over fineness,.
9. slightly expanded concrete according to claim 1, it is characterised in that the miberal powder is S95 grades, and activity was in 28 days
101%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710381418.5A CN107265969B (en) | 2017-05-25 | 2017-05-25 | Micro-expansive concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710381418.5A CN107265969B (en) | 2017-05-25 | 2017-05-25 | Micro-expansive concrete |
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| Publication Number | Publication Date |
|---|---|
| CN107265969A true CN107265969A (en) | 2017-10-20 |
| CN107265969B CN107265969B (en) | 2019-12-10 |
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| CN201710381418.5A Active CN107265969B (en) | 2017-05-25 | 2017-05-25 | Micro-expansive concrete |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108503308A (en) * | 2018-04-20 | 2018-09-07 | 北京易成混凝土有限公司 | Slightly expanded concrete mixture |
| CN112047686A (en) * | 2020-09-04 | 2020-12-08 | 赵荣菊 | Internal expansion joint-breaking type high-strength concrete |
| CN112759308A (en) * | 2021-01-05 | 2021-05-07 | 桐乡市鑫联混凝土有限公司 | Cold-resistant concrete and preparation method thereof |
| CN112777982A (en) * | 2021-01-08 | 2021-05-11 | 中国建筑第八工程局有限公司 | Concrete capable of reducing cracks of underground pipe gallery wallboard |
| CN113998936A (en) * | 2021-12-10 | 2022-02-01 | 杭州华杰商品混凝土有限公司 | High-performance anti-cracking concrete and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH01100046A (en) * | 1987-10-13 | 1989-04-18 | Asou Cement Kk | Fixing material for lock bolt or the like |
| CN102826803A (en) * | 2012-07-31 | 2012-12-19 | 湖北中桥科技有限公司 | Ballastless track self-compaction concrete and filling construction method thereof |
| CN104671719A (en) * | 2015-03-06 | 2015-06-03 | 建研建材有限公司 | Cement-based reinforced grouting material with strong acid resistance |
| CN105174855A (en) * | 2015-09-01 | 2015-12-23 | 重庆建工住宅建设有限公司 | C30 micro-expansive self-compacting concrete |
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2017
- 2017-05-25 CN CN201710381418.5A patent/CN107265969B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01100046A (en) * | 1987-10-13 | 1989-04-18 | Asou Cement Kk | Fixing material for lock bolt or the like |
| CN102826803A (en) * | 2012-07-31 | 2012-12-19 | 湖北中桥科技有限公司 | Ballastless track self-compaction concrete and filling construction method thereof |
| CN104671719A (en) * | 2015-03-06 | 2015-06-03 | 建研建材有限公司 | Cement-based reinforced grouting material with strong acid resistance |
| CN105174855A (en) * | 2015-09-01 | 2015-12-23 | 重庆建工住宅建设有限公司 | C30 micro-expansive self-compacting concrete |
Non-Patent Citations (1)
| Title |
|---|
| 金玉书: "C40自密实微膨胀钢管混凝土的配制与施工", 《商品混凝土》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108503308A (en) * | 2018-04-20 | 2018-09-07 | 北京易成混凝土有限公司 | Slightly expanded concrete mixture |
| CN112047686A (en) * | 2020-09-04 | 2020-12-08 | 赵荣菊 | Internal expansion joint-breaking type high-strength concrete |
| CN112759308A (en) * | 2021-01-05 | 2021-05-07 | 桐乡市鑫联混凝土有限公司 | Cold-resistant concrete and preparation method thereof |
| CN112777982A (en) * | 2021-01-08 | 2021-05-11 | 中国建筑第八工程局有限公司 | Concrete capable of reducing cracks of underground pipe gallery wallboard |
| CN113998936A (en) * | 2021-12-10 | 2022-02-01 | 杭州华杰商品混凝土有限公司 | High-performance anti-cracking concrete and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN107265969B (en) | 2019-12-10 |
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