CN103408259B - Durable concrete used for frame columns - Google Patents
Durable concrete used for frame columns Download PDFInfo
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- CN103408259B CN103408259B CN201310309938.7A CN201310309938A CN103408259B CN 103408259 B CN103408259 B CN 103408259B CN 201310309938 A CN201310309938 A CN 201310309938A CN 103408259 B CN103408259 B CN 103408259B
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Abstract
The invention provides durable concrete used for frame columns. The concrete is capable of meeting design requirements of concrete frame columns, enhancing durability and reducing the production cost of the concrete frame columns. Raw materials of the concrete comprise, by weight, 343-357 parts of cement, 616-654 parts of sand, 1006-1068 parts of broken stone, 168-172 parts of water, 6.7-6.9 parts of a water reducing agent, 147-153 parts of coal ash and 0.69-0.71 part of fiber.
Description
Technical field
The present invention relates to technical field of concrete production, be specially a kind of durability concrete for frame column.
Background technology
Concrete frame trestle is used in the buildings such as building, bridge widely.For the design requirements of concrete frame trestle, while requiring to carry out proportioning according to the strength grade of concrete frame trestle, concrete weather resistance to be considered simultaneously, after concrete production, in 2 hours, workability is good, concrete slump wants 160-200mm, and have degree of mobilization relatively preferably, be conducive to concrete closely knit in the Steel Grid of comparatively dense, concrete adopts pumping construction technique, good pump-conveying property should be had, do not emanate, seepage-resistant grade is greater than P8, subregion will be considered to prevent hydration heat formation temperature crack, when considering that large area concrete is built again, the generation of shrinkage crack, need the requirement considering protection against corrosion, erosion simultaneously.
High performance concrete (HPC) is that grow up the nineties in 20th century a kind of integrates good workability, mechanical property, volume stability, endurance quality, economic performance as the multiple adding Concrete of premixing of essential characteristic.By the appearance of HPC theory, people are made to be familiar with " the volcanic ash mass effect ", " micro aggregate effect ", " particle form effect " of all kinds of adulterant further to concrete influence.Especially as the concrete of hard brittle material, effect of prestressed is the important measurement index of HPC, based on the above characteristic of high performance concrete, adopts high performance concrete pouring frame post to be regarded as effective method.How proportioning high performance concrete, the design requirements making it meet concrete frame trestle simultaneously, reduces production cost and has important engineer applied and be worth and good economic benefit.
Summary of the invention
For the problems referred to above, the invention provides a kind of durability concrete for frame column, it meets the design requirements of concrete frame trestle, strengthens its weather resistance, also reduces its production cost.
Its technical scheme is such: it is characterized in that: with weight parts, and its raw material comprises cement 343-357 part, sand 616-654 part, rubble 1006-1068 part, water 168-172 part, water reducer 6.7-6.9 part, flyash 147-153 part, fiber 0.69-0.71 part.
It is further characterized in that: with weight parts, and its raw material comprises cement 350 parts, 635 parts, sand, rubble 1037 parts, 170 parts, water, water reducer 6.8 parts, 150 parts, flyash, fiber 0.7 part;
Described water reducer is poly carboxylic acid series water reducer;
Described cement is P.O42.5 level silicate low alkali cement, and the surface-area of described cement is no more than 350m
3/ kg, the tricalcium aluminate content of described cement is no more than 8%, and free calcium oxide is no more than 1.5%, and alkali content is no more than 0.6%;
Described flyash is II grade of flyash, and the loss on ignition of described flyash is not more than 5%, and sulfur trioxide content is less than 3%, and water demand ratio is not more than 105%;
Described sand is that coarse sand and fine sand are mixed and joined, and the fineness modulus of described sand is more than 2.5, and silt content is no more than 3.0%, and clod content is no more than 1.0%, and chloride ion content is no more than 0.06%;
Described rubble is the rubble of particle diameter 5-25mm continuous grading, and described rubble adopts graduation two ratio, and the rubble of 16-25mm has 70%, the rubble of 5-16mm has 30%, the silt content of described rubble is no more than 1.0%, and clod content is no more than 0.5%, and elongated particles is no more than 15%;
Described fiber is polypropylene fibre.
The invention has the beneficial effects as follows: adopt water reducer can significantly improve concrete slump and concrete divergence, mobility; More obvious to the raising (reinforced effects) of early age strength of concrete; Concrete adhesive aggregation performance significantly increases, and is conducive to reinforcing bar and concrete bonding bonds.Adopt water reducer configuration ad eundem strength concrete, compared with normal concrete, can effectively save cement consumption and reach more than 10%, save cost, its component of flyash is levigate spheroidal particle, in the gelling material of mixing, the bonding of effectively evacuating cement gel material particle can be played, play " spin " effect between glue material, thus concrete degree of mobilization can be made to increase, flyash equivalent replace cement is used in large quantities in the present invention, reduce production cost, simultaneously because flyash unit weight is less, after replacement, gelling material mortar volume also will strengthen thereupon, sufficient slurry ensure that the mobility of mixture, suitable doping quantity of fly ash, there is certain water-reduction, and effectively can impel the performance of concrete strength, be conducive to the preparation of high strength concrete, because flyash early ambulant is relatively low, hydration heat release is also corresponding to be delayed, therefore, after adding coal ash, concrete slump loss is relatively little, flyash doping simultaneously, effectively can improve the mixed earth intensity of 7 days, adding coal ash, be conducive to making full use of nature and social resources, construction refuse resource is recycled, create reproduction value, protection of the environment, concrete has extraordinary anti-permeability performance, can reach more than P20, and displacement flux is generally between 350-680 coulomb, normal concrete displacement flux is then between 1000-2000 coulomb, illustrate that this concrete structure is closely knit, pore texture is reasonable, has good weather resistance.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
For a durability concrete for frame column, design theory capacity 2342Kg/m
3, strength grade is C50, the slump is 160-200mm, , design life should be greater than 100 years, concrete folk prescription total alkali should lower than 3kg, the 56 day length of time of concrete charge pass, test should lower than 1200 coulombs, Chloride Ion in Concrete content should be no more than gelling material heavy 0.1%, for prestressed concrete should be no more than gelling material heavy 0.06%, after requirement concrete production, in 2 hours, workability is good, concrete slump requires 160-200mm, and have degree of mobilization relatively preferably, be conducive to concrete closely knit in the Steel Grid of comparatively dense, slump-loss is required: in 2h in transport casting process, under 25 ~ 34 DEG C of conditions, loss is not more than 30mm, concrete adopts pumping construction technique, good pump-conveying property should be had, do not emanate, seepage-resistant grade is greater than P8, after concrete formation, the connectivity not occurring because of concrete shrinkage or partial water heat-transmission impact and formed destroys crack.
Embodiment 1: with weight parts, concrete raw material comprises cement 350 parts, 635 parts, sand, rubble 1037 parts, 170 parts, water, water reducer 6.8 parts, 150 parts, flyash, fiber 0.7 part.
Embodiment 2: with weight parts, concrete raw material comprises cement 343 parts, 616 parts, sand, rubble 1006 parts, 168 parts, water, water reducer 6.7 parts, 147 parts, flyash, fiber 0.69 part.
Embodiment 3: with weight parts, concrete raw material comprises cement 357 parts, 654 parts, sand, rubble 1068 parts, 172 parts, water, water reducer 6.9 parts, 153 parts, flyash, fiber 0.71 part.
Wherein cement preferred P.O42.5 level silicate low alkali cement, and the surface-area of cement is no more than 350m
3/ kg, the tricalcium aluminate content of cement is no more than 8%, free calcium oxide is no more than 1.5%, alkali content is no more than 0.6%, water reducer is poly carboxylic acid series water reducer, flyash is II grade of flyash, the loss on ignition of flyash is not more than 5%, sulfur trioxide content is less than 3%, water demand ratio is not more than 105%, sand is that coarse sand and fine sand are mixed and joined, the fineness modulus of described sand is more than 2.5, silt content is no more than 3.0%, clod content is no more than 1.0%, chloride ion content is no more than 0.06%, rubble is the rubble of particle diameter 5-25mm continuous grading, described rubble adopts graduation two ratio, the rubble of 16-25mm has 70%, the rubble of 5-16mm has 30%, the silt content of described rubble is no more than 1.0%, clod content is no more than 0.5%, elongated particles is no more than 15%, fiber is polypropylene fibre.
Adopt poly carboxylic acid series water reducer can significantly improve concrete slump and concrete divergence, mobility; More obvious to the raising (reinforced effects) of early age strength of concrete; Concrete adhesive aggregation performance significantly increases, and is conducive to reinforcing bar and concrete bonding bonds.Adopt poly carboxylic acid series water reducer configuration ad eundem strength concrete, compared with normal concrete, can effectively save cement consumption and reach more than 10%, save cost, its component of flyash is levigate spheroidal particle, in the gelling material of mixing, the bonding of effectively evacuating cement gel material particle can be played, play " spin " effect between glue material, thus concrete degree of mobilization can be made to increase, flyash equivalent replace cement is used in large quantities in mixed earth of the present invention, reduce production cost, simultaneously because flyash unit weight is less, after replacement, gelling material mortar volume also will strengthen thereupon, sufficient slurry ensure that the mobility of mixture, suitable doping quantity of fly ash, there is certain water-reduction, and effectively can impel the performance of concrete strength, be conducive to the preparation of high strength concrete, because flyash early ambulant is relatively low, hydration heat release is also corresponding to be delayed, therefore, after adding coal ash, concrete slump loss is relatively little, flyash doping, effectively can improve the mixed earth intensity of 7 days simultaneously, adding coal ash, is conducive to making full use of nature and social resources, is recycled by construction refuse resource, creates reproduction value, protection of the environment, concrete has extraordinary anti-permeability performance, can reach more than P20, and displacement flux is generally between 350-680 coulomb, normal concrete displacement flux is then between 1000-2000 coulomb, illustrate that this concrete structure is closely knit, pore texture is reasonable, has good weather resistance.The fiber of uniformly dispersing presents tridimensional network in cement concrete, dehydration drying shrinkage is born and the tensile stress produced in cement concrete plastic state, reduce the generation stoping concrete surface layer crack even completely, improve concrete impermeability, endurance quality simultaneously.
Claims (4)
1., for a durability concrete for frame column, with weight parts, its raw material comprises cement 343-357 part, sand 616-654 part, rubble 1006-1068 part, water 168-172 part, water reducer 6.7-6.9 part, flyash 147-153 part, fiber 0.69-0.71 part, concrete anti-permeability performance reaches more than P20, and displacement flux is between 350-680 coulomb, described cement is P.O42.5 level silicate low alkali cement, and the surface-area of described cement is no more than 350m
3/ kg, the tricalcium aluminate content of described cement is no more than 8%, free calcium oxide is no more than 1.5%, alkali content is no more than 0.6%, described flyash is II grade of flyash, the loss on ignition of described flyash is not more than 5%, sulfur trioxide content is less than 3%, water demand ratio is not more than 105%, described sand is that coarse sand and fine sand are mixed and joined, the fineness modulus of described sand is more than 2.5, silt content is no more than 3.0%, clod content is no more than 1.0%, chloride ion content is no more than 0.06%, described rubble is the rubble of particle diameter 5-25mm continuous grading, described rubble adopts graduation two ratio, the rubble of 16-25mm has 70%, the rubble of 5-16mm has 30%, the silt content of described rubble is no more than 1.0%, clod content is no more than 0.5%, elongated particles is no more than 15%.
2. a kind of durability concrete for frame column according to claim 1, is characterized in that: with weight parts, and its raw material comprises cement 350 parts, 635 parts, sand, rubble 1037 parts, 170 parts, water, water reducer 6.8 parts, 150 parts, flyash, fiber 0.7 part.
3. a kind of durability concrete for frame column according to claim 1, is characterized in that: described water reducer is poly carboxylic acid series water reducer.
4. a kind of durability concrete for frame column according to claim 1, is characterized in that: described fiber is polypropylene fibre.
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| CN201310309938.7A CN103408259B (en) | 2013-07-23 | 2013-07-23 | Durable concrete used for frame columns |
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| CN201310309938.7A CN103408259B (en) | 2013-07-23 | 2013-07-23 | Durable concrete used for frame columns |
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| CN103408259A CN103408259A (en) | 2013-11-27 |
| CN103408259B true CN103408259B (en) | 2015-05-20 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103708781A (en) * | 2013-12-20 | 2014-04-09 | 亚泰集团沈阳建材有限公司 | Low-chloride ion high-performance concrete |
| CN105174891A (en) * | 2015-09-10 | 2015-12-23 | 安徽芜湖飞琪水泥制品有限公司 | Low-alkali concrete column and preparation method thereof |
| CN106957165A (en) * | 2017-03-29 | 2017-07-18 | 合肥天沃能源科技有限公司 | It is a kind of to be used to build energy-saving material of construction enclosure wall and preparation method thereof |
| CN111039618A (en) * | 2020-03-03 | 2020-04-21 | 中建西部建设湖南有限公司 | Low-electric-flux fiber concrete for large volume of maritime work and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1385394A (en) * | 2001-12-07 | 2002-12-18 | 北京市城昌商品混凝土联营公司 | Fibre anti-permeation cracking-resistant concrete |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1385394A (en) * | 2001-12-07 | 2002-12-18 | 北京市城昌商品混凝土联营公司 | Fibre anti-permeation cracking-resistant concrete |
Non-Patent Citations (3)
| Title |
|---|
| 住房和城乡建设部工程质量安全监管司.粉煤灰.《建筑业10项新技术》.中国建筑工业出版社,2011,(第1版),23. * |
| 白建方.抗渗性.《混凝土工新手易学一本通》.机械工业出版社,2012,(第1版),9. * |
| 缪昌文.耐久性混凝土.《高性能混凝土外加剂》.化学工业出版社,2008,(第1版),241-332. * |
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