CN101113586A - Continuously strong bridge structure with variable concrete density gradient - Google Patents
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Abstract
The invention relates to a successive rigid-frame bridge structure with gradient variation of concrete density. The upper structure of the bridge uses three concrete materials, wherein, mid-span base material uses strong light aggregate concrete with dried apparent density of no more than 1950kg/m3 so as to reduce structure weight; the base material at the concretion position of a frusta and a beam uses strong common concrete with dried apparent density of no less than 2300kg/m3 so as to satisfy higher compression resistance and splitting resistance strength the concretion position of frusta and beam; the base material of primary beam between mid-span and the concretion position of frusta and beam uses strong light concrete of fiber toughening and splitting resistance with dried apparent density of 1950kg/ m3-2300kg/m3 so as to reduce structure weight, improve concrete splitting resistance performance and reduce adverse impacts caused by constrict creep. The invention can handle the technical problem of serious cracking between the mid-span downwarp of successive rigid-frame bridge and a box girder through the optimized combining matching of the material and the structure and the collocating way of the optimized prestress bundle.
Description
Technical field
The present invention relates to the bridge field, particularly relate to the continuously strong bridge structure that a kind of concrete density gradient changes.
Background technology
It is many to stride footpath continuous rigid frame bridge construction quantity greatly, and application prospect is wide, and the continuous rigid frame bridge that China has built up all exists in various degree span centre downwarp and case beam cracking disease more than 80%, had a strong impact on the bridge operation security.Therefore span centre downwarp and case beam cracking control technology is the hot issue of continuous rigid frame bridge construction research always.
Since the eighties in last century, Chinese scholars causes the main cause of downwarp of continuous rigid frame bridge span centre and case beam cracking disease to have by a large amount of continuous rigid frame bridge disease survey being studied, being thought: (1) ordinary concrete is from great.In focusing on long-span bridge girder construction load, account for more than 80%, long-term a high proportion ofly cause span centre downwarp sustainable growth, case beam crack to be on the increase from heavy load; (2) the high-strength concrete shrinkage and creep is big.High-strength concrete shrinkage and creep mechanism understanding is insufficient, and the span centre downwarp amount that different shrinkage and creep theories draws differs and reaches more than 30%, causes theoretical calculating and the virtual condition obvious difference.
At above problem, the major control technology of continuous rigid frame bridge span centre downwarp at present and case beam cracking has: 1. increase beam body camber, change the arrangement of presstressed reinforcing steel.2. superstructure all adopts high strength lightweight aggregate concrete.3. the superstructure span centre adopts high strength lightweight aggregate concrete, Dun Lianggujiechu to adopt high-strength ordinary concrete.4. superstructure partly adopts steel case beam or part to adopt the steel web.5. the continuous rigid frame bridge of existing span centre downwarp and case beam cracking is reinforced.These technology have all been slowed down the span centre downwarp and the case beam cracking of structure to a certain extent, but fundamentally do not solve the span centre downwarp and the case beam cracking problem of continuous rigid frame bridge.The high strength lightweight aggregate concrete shrinkage and creep is big, tensile strength is low, in the bridge span and the girder between the pier beam consolidation place diagonal crack still appears; Steel work and concrete are connected that technical requirements height, difficulty of construction are big, construction and maintenance cost height; Reinforce not only maintenance cost height, and reinforce axle casing span centre downwarp and ftracture with the case beam and still can not be controlled effectively, reinforcing technique can not address this problem.
Summary of the invention
Technical problem to be solved by this invention is: by the length ratio of three kinds of concrete materials in the optimum organization superstructure and the arrangement of preferred prestressing tendon, the continuously strong bridge structure that provides a kind of concrete density gradient to change is so that solve continuous rigid frame bridge span centre downwarp and case beam cracking technical barrier.
The technical scheme that the present invention solves its technical problem employing is: the continuously strong bridge structure that the concrete density gradient that provides changes, and this structure adopts three kinds of concrete materials, and wherein, the base material of span centre adopts dried apparent density to be not more than 1950kg/m
3High strength lightweight aggregate concrete, the base material of Dun Lianggujiechu adopts to be done apparent density and is not less than 2300kg/m
3High-strength ordinary concrete, girder base material between span centre and the pier beam consolidation place adopts and does apparent density is 1950kg/m
3-2300kg/m
3Fiber reinforced anti-cracking high-strength specified density concrete.
The advantage that the present invention compared with prior art has mainly is: according to continuous rigid frame bridge loading characteristic, mid-span deflection Changing Pattern, fracture propagation mode and cracking mechanism thereof, and determined the rational proportion of three kinds of concrete materials shared length in bridge superstructure and the arrangement of prestressing tendon.Promptly adopt high strength lightweight aggregate concrete (to do apparent density≤1950kg/m at the continuous rigid frame bridge span centre
3), the deadweight of span centre part-structure can alleviate more than 20%; Dun Lianggujiechu adopts high-strength ordinary concrete (to do apparent density 〉=2300kg/m
3), to satisfy pier beam consolidation place higher compression breaking resistance; Girder between span centre and the pier beam consolidation place adopts fiber reinforced anti-cracking high-strength specified density concrete (to do apparent density 1950-2300kg/m
3), fiber reinforced anti-cracking high-strength specified density concrete shrinkage and creep is little, tensile strength is high (approaching high-strength ordinary concrete), can reduce dead load more than 10%, improves case web breaking resistance and reaches more than 20%, reduces the adverse effect of shrinkage and creep; Form the continuously strong bridge structure of the concrete density gradient variation of the present invention's proposition thus, this structure can solve existing ubiquitous span centre downwarp of continuous rigid frame bridge and case beam cracking technical barrier.
Description of drawings
Stride in the superstructure of Fig. 1 for performance major technique feature of the present invention and be continuously strong bridge structure schematic diagram that concrete density gradient changes (wherein stride the footpath and hole count is variable continuously), that is: stride in according to design feature and stress performance and adopted high strength lightweight aggregate concrete, fiber reinforced anti-cracking high-strength specified density concrete and three kinds of concrete materials of high-strength ordinary concrete, end bay all adopts high-strength ordinary concrete material.
Stride in the superstructure of Fig. 2 for performance major technique feature of the present invention to concrete density gradient changes, end bay is the span centre continuously strong bridge structure schematic diagram of introducing high strength lightweight aggregate concrete (wherein stride the footpath and hole count is variable continuously), that is: stride in and adopted high strength lightweight aggregate concrete, fiber reinforced anti-cracking high-strength specified density concrete and three kinds of concrete materials of high-strength ordinary concrete, end bay adopts high strength lightweight aggregate concrete and two kinds of concrete materials of high-strength ordinary concrete.
Fig. 3 is the continuously strong bridge structure schematic diagram that concrete density gradient changes (wherein stride the footpath and hole count is variable continuously) for striding in the superstructure of performance major technique feature of the present invention with end bay, that is: stride with end bay in and all adopted high strength lightweight aggregate concrete, fiber reinforced anti-cracking high-strength specified density concrete and three kinds of concrete materials of high-strength ordinary concrete.
Among above-mentioned Fig. 1 to Fig. 3:
Represent high-strength ordinary concrete,
Represent fiber reinforced cracking resistance specified density concrete,
The expression high strength lightweight aggregate concrete.
The specific embodiment
The continuously strong bridge structure that concrete density gradient provided by the invention changes, be according to continuous rigid frame bridge stride the footpath, continuously parameters such as hole count, load and concrete material characteristic are optimized combinations matches to structure, determine three kinds of length, length ratio and section forms thereof that concrete material is shared in the dissimilar continuously strong bridge structures, and the corresponding relation of distribution rule, loss of prestress and span centre downwarp by loss of prestress in three kinds of concrete, determine parameters such as box girder pre-stressed bundle quantity, distributing position, space is linear.
The continuously strong bridge structure that concrete density gradient provided by the invention changes, be to determine the ratio of three kinds of concrete materials shared length in bridge superstructure and the arrangement of prestressing tendon according to continuous rigid frame bridge loading characteristic, mid-span deflection Changing Pattern, fracture propagation mode and cracking mechanism thereof, that is: the base material of span centre adopts dried apparent density to be not more than 1950kg/m
3High strength lightweight aggregate concrete, the base material of Dun Lianggujiechu adopts does apparent density for being not less than 2300kg/m
3High-strength ordinary concrete, girder base material between span centre and the pier beam consolidation place adopts and does apparent density is 1950kg/m
3-2300kg/m
3Fiber reinforced anti-cracking high-strength specified density concrete, form the continuous rigid frame bridge that described concrete density gradient changes.
Above-mentioned high strength lightweight aggregate concrete can be formed through stirring by light aggregate, sand, cement, water, breeze and chemical admixture, presses kg/m
3Meter, the proportioning of each composition is respectively: light aggregate 530-590, sand 650-700, cement 470-530, water 160-175, breeze 50-100, chemical admixture adopts high efficiency water reducing agent FDN or polycarboxylic acids, high efficiency water reducing agent FDN is the 0.8-1.4% of cement consumption, and polycarboxylic acids is cement consumption 0.6-1.3%.
Above-mentioned fiber reinforced anti-cracking high-strength specified density concrete can be formed through stirring by light aggregate, cement, sand, rubble, water, breeze, toughness reinforcing anticracking material and chemical admixture, presses kg/m
3Meter, the proportioning of each composition is respectively: light aggregate 200-250, cement 430-480, sand 650-700, rubble 580-660, water 150-165, breeze 50-100, toughness reinforcing anticracking material adopts toughness reinforcing anti-crack fiber and water-soluble polymer, and it is 40-160kg/m that wherein toughness reinforcing anti-crack fiber adopts composition proportion
3Steel fibre or 40-160kg/m
3Steel fibre and 1-2kg/m
3The compound of polypropylene fibre, water-soluble polymer are the 10-20% of cement consumption.Chemical admixture adopts high efficiency water reducing agent FDN or polycarboxylic acids, and wherein high efficiency water reducing agent FDN is the 0.8-1.4% of cement consumption, and polycarboxylic acids is cement consumption 0.6-1.3%.Described water-soluble polymer can adopt modified polyacrylic acid base polymer emulsion or modified polyvinylalcohol base polymer emulsion, and solid content is 20-60%.Described modified polyacrylic acid base polymer emulsion is a polyacrylate dispersion.Described modified polyvinylalcohol base polymer emulsion is a polyvinyl alcohol.
Above-mentioned light aggregate can adopt particle diameter 5-20mm, apparent density 1200-1500kg/m
3, bulk density 700-1100kg/m
3And the leca of cylindrical compress strength 〉=6.5Mpa or haydites of book structure or lytag.
Above-mentioned high-strength ordinary concrete is formed through stirring by cement, sand, rubble, water, breeze and chemical admixture, presses kg/m
3Meter, the proportioning of each composition is respectively: cement 430-460, sand 680-740, rubble 980-1040, water 150-165, breeze 40-80, chemical admixture adopts high efficiency water reducing agent FDN or polycarboxylic acids, wherein high efficiency water reducing agent FDN is the 0.8-1.4% of cement consumption, and polycarboxylic acids is cement consumption 0.6-1.3%.
The invention will be further described below in conjunction with specific embodiment, but do not limit the present invention.
Embodiment 1:
Still there is not the continuous rigid frame bridge enforcement construction that concrete density gradient changes at present both at home and abroad.The span centre that only external a few countries is striden in continuous rigid frame bridge is introduced high strength lightweight aggregate concrete, built up the continuous rigid frame bridge that superstructure is made up of high strength lightweight aggregate concrete and two kinds of concrete materials of high-strength ordinary concrete, alleviated the optimize structure purpose of mechanical property of dead load thereby reached.The Stolma continuous rigid frame bridge of the main span 301m that builds up as Norway in 1998 adopts high-strength ordinary concrete, span centre 184m to adopt high strength lightweight aggregate concrete at the 58.5m of pier beam consolidation place, both sides.But after such bridge built up operation, the serious threat Structure Safety for Bridge a large amount of diagonal cracks still appearred, in the girder web between span centre and the pier beam consolidation place.
The continuously strong bridge structure that a kind of concrete density gradient that this example proposes changes, in the span centre of striding introduce and do the little high strength lightweight aggregate concrete of apparent density, alleviate dead load; In the Dun Lianggujiechu that strides adopt high-strength ordinary concrete, satisfy the high resistance to compression breaking resistance requirement of Dun Lianggujiechu; In the span centre of striding and the girder between the pier beam consolidation place introduce fiber reinforced anti-cracking high-strength specified density concrete, not only alleviated dead load, reduced the shrinkage and creep influence but also strengthened the structure breaking resistance.More than three kinds of concrete materials be applied to the middle span centre of continuous rigid frame bridge, by the footpath of striding to continuous rigid frame bridge, continuous hole count, parameters such as load and concrete material characteristic are optimized combinations matches to bridge construction, grasp the distribution of internal force situation of dissimilar continuous rigid frame bridge girders, thereby determine the section form of structure, three kinds of length and length ratios thereof that concrete material is shared, the arrangement of prestressing tendon and bridge are linear etc., can solve continuous rigid frame bridge span centre downwarp ubiquity, the excessive technical barrier that is easy to generate diagonal crack of girder web principal tensile stress between span centre and the pier beam consolidation place.
The continuously strong bridge structure that a kind of concrete density gradient that this example proposes changes, the main employing moved the blue segmented cantilever pouring job practices construction of extension, also can build according to the job practices that the bridge surrounding enviroment adopt ground support and cantilever pouring to combine.
Specifically be applied to stride in the superstructure in the continuous rigid frame bridge that adopts high strength lightweight aggregate concrete, fiber reinforced cracking resistance specified density concrete and three kinds of concrete density gradients variations of high-strength ordinary concrete.
Concrete raw material is as follows:
(1) high strength lightweight aggregate concrete:
Cement: grade is Portland cement, portland cement, slag cements or the pulverized fuel ash cement of .42.5 or .52.5.
Light aggregate: particle diameter 5-20mm, apparent density 1200-1500kg/m
3, bulk density 700-1100kg/m
3, cylindrical compress strength 〉=6.5Mpa leca or haydites of book structure or lytag.
Rubble: particle diameter 4.75-19mm, mud content＜1%.
Sand: in thick river sand, fineness modulus 2.6-2.8.
Breeze: specific area 500m
2/ kg.
Chemical admixture: any in high efficiency water reducing agent FDN and the polycarboxylic acids.
Each composition and proportioning (kg/m
3) be respectively: light aggregate 530-590, sand 650-700, cement 470-530, water 160-175, breeze 50-100, Admixture is high efficiency water reducing agent FDN or polycarboxylic acids, FDN is that the 0.8-1.4% or the polycarboxylic acids of cement consumption is cement consumption 0.6-1.3%, and stirring after the weighing in proportion is prepared from.
(2) fiber reinforced anti-cracking high-strength specified density concrete:
Cement: grade is Portland cement, portland cement, slag cements or the pulverized fuel ash cement of .42.5 or .52.5.
Light aggregate: particle diameter 5-20mm, apparent density 1200-1500kg/m
3, bulk density 700-1100kg/m
3, cylindrical compress strength 〉=6.5Mpa leca or haydites of book structure or lytag.
Common gathering materials: any in basalt, granite or the limestone, particle diameter 5-25mm, mud content＜1%.
Rubble: particle diameter 4.75-19mm, mud content＜1%.
Sand: in thick river sand, fineness modulus 2.6-2.7.
Breeze: specific area 500m
2/ kg.
Toughness reinforcing anti-crack fiber: the compound that adopts steel fibre or steel fibre and polypropylene fibre.
Chemical admixture: any in high efficiency water reducing agent FDN and the polycarboxylic acids.
Each composition and proportioning (kg/m
3) being respectively: it is 40-160kg/m that light aggregate 200-250, cement 430-480, sand 650-700, rubble 580-660, water 150-165, breeze 50-100, toughness reinforcing anti-crack fiber adopt composition proportion
3Steel fibre or 40-160kg/m
3Steel fibre and 1-2kg/m
3The compound of polypropylene fibre, water-soluble polymer are cement consumption 0.6-1.3% by the 10-20% of cement consumption, 0.8-1.4% or the polycarboxylic acids that high efficiency water reducing agent FDN is cement consumption, and stirring after the weighing in proportion is prepared from.
(3) high-strength ordinary concrete
Weight proportion (the kg/m that each is formed
3) being: cement 430-460, sand 680-740, rubble 980-1040, water 150-165, breeze 40-80, high efficiency water reducing agent FDN are that the 0.8-1.4% or the polycarboxylic acids of cement consumption is cement consumption 0.6-1.3%.
Concrete result of implementation is seen Fig. 1 (continuous rigid frame spanning footpath and hole count is variable continuously).
Embodiment 2:
The continuously strong bridge structure that a kind of concrete density gradient that this example proposes changes, in the span centre of the span centre of striding and end bay introduce and do the little high strength lightweight aggregate concrete of apparent density, by in stride and end bay is used high strength lightweight aggregate concrete, further alleviate dead load; In the Dun Lianggujiechu that strides adopt high-strength ordinary concrete, satisfy the high resistance to compression breaking resistance requirement of Dun Lianggujiechu; In the span centre of striding and the girder between the pier beam consolidation place introduce fiber reinforced anti-cracking high-strength specified density concrete, not only alleviated dead load, reduced the shrinkage and creep influence but also strengthened the structure breaking resistance.More than three kinds of concrete materials be applied to the middle span centre of continuous rigid frame bridge, high strength lightweight aggregate concrete and high-strength ordinary concrete are applied in the end bay, arrangement by to bridge superstructure optimum organization coupling and preferred prestressing tendon can solve the excessive technical barrier that is easy to generate diagonal crack of girder web principal tensile stress between continuous rigid frame bridge span centre downwarp ubiquity, span centre and the pier beam consolidation place.
The continuously strong bridge structure that a kind of concrete density gradient that this example proposes changes, the main employing moved the blue segmented cantilever pouring job practices construction of extension, also can build according to the job practices that the bridge surrounding enviroment adopt ground support and cantilever pouring to combine.
Stride in specifically being applied to and adopt high strength lightweight aggregate concrete, fiber reinforced cracking resistance specified density concrete and three kinds of concrete of high-strength ordinary concrete, end bay adopts in the continuous rigid frame bridge of high strength lightweight aggregate concrete and high-strength ordinary concrete.
Concrete result of implementation is seen Fig. 2 (continuous rigid frame spanning footpath and hole count is variable continuously).
Embodiment 3:
The continuously strong bridge structure that a kind of concrete density gradient that this example proposes changes, according to the force-bearing situation of continuous rigid frame bridge, in stride all to introduce and do the little high strength lightweight aggregate concrete of apparent density with the span centre of end bay, further alleviate dead load; In the Dun Lianggujiechu that strides with end bay all adopt high-strength ordinary concrete, satisfy the high resistance to compression breaking resistance requirement of Dun Lianggujiechu; In stride and the span centre of end bay and the girder between the pier beam consolidation place are all introduced fiber reinforced anti-cracking high-strength specified density concrete, not only alleviated dead load, reduced the shrinkage and creep influence but also strengthened the structure breaking resistance.More than three kinds of concrete materials all be applied to continuous rigid frame bridge in stride with end bay in, arrangement by to bridge superstructure optimum organization coupling and preferred prestressing tendon can solve the excessive technical barrier that is easy to generate diagonal crack of girder web principal tensile stress between continuous rigid frame bridge span centre downwarp ubiquity, span centre and the pier beam consolidation place.
The continuously strong bridge structure that a kind of concrete density gradient that this example proposes changes, the main employing moved the blue segmented cantilever pouring job practices construction of extension, also can build according to the job practices that the bridge surrounding enviroment adopt ground support and cantilever pouring to combine.
Stride in specifically being applied to end bay and all adopt in the continuous rigid frame bridge of high strength lightweight aggregate concrete, fiber reinforced cracking resistance specified density concrete and three kinds of concrete density gradients variations of high-strength ordinary concrete.
Concrete result of implementation is seen Fig. 3 (continuous rigid frame spanning footpath and hole count is variable continuously).
In above embodiment, continuous rigid frame bridge superstructure span centre adopts the girder between high strength lightweight aggregate concrete, span centre and the pier beam consolidation place to adopt fiber reinforced anti-cracking high-strength specified density concrete, Dun Lianggujiechu to adopt high-strength ordinary concrete, optimizes the stress performance of bridge construction by the mixed-arrangement of concrete material property and prestressing tendon.Because it is big that this bridge construction is striden the footpath, mainly adopts the segmented construction of cantilever pouring method to form.
Utilize the continuously strong bridge structure of the scheme construction that this example provides can reach following technical indicator:
(1) light aggregate concrete performance indications
28d compressive strength 〉=60.0MPa; The slump: 18-22cm; Delamination degree＜5%; Apparent density: 1800-1950kg/m
3360d shrinkage value＜0.70mm/m; 28d coefficient＜2.40 of creeping; Modulus of elasticity 〉=25.0GPa; Impervious grade: more than the P12; Freeze proof grade 〉=F200.
(2) fiber reinforced anti-cracking high-strength specified density concrete performance indications
28d compressive strength 〉=60.0MPa; The slump: 18-22cm; Delamination degree＜5%; Apparent density: 1950-2250kg/m
3Fracture toughness index η 30＞23; Modulus of elasticity: 33.0-37.0GPa; 360d shrinkage value＜0.45mm/m; 28d coefficient＜1.90 of creeping; Impervious grade: more than the P12; Freeze proof grade 〉=F200.
(3) continuous rigid frame bridge performance indications
Bridge axes off normal＜10mm; Become bridge bridge floor elevation: ± 10mm; With striding symmetric points bridge floor depth displacement＜10mm; Bridge floor planeness≤5mm; Prestressing force and the concrete coefficient of sliding friction 〉=0.45; Prestressing tendon elongation rate 〉=4%; Prestressing tendon initial load 1000h internal stress loss≤2.5%; Span centre downwarp final value≤L/1000; The beam body does not have the principal tensile stress crack; Safe class reaches bridge security I level level.
Claims (7)
1. a continuously strong bridge structure is characterized in that the continuously strong bridge structure that a kind of concrete density gradient changes, and the superstructure of this bridge adopts three kinds of concrete materials, and wherein: the base material of span centre adopts dried apparent density to be not more than 1950kg/m
3High strength lightweight aggregate concrete, the base material of Dun Lianggujiechu adopts to be done apparent density and is not less than 2300kg/m
3High-strength ordinary concrete, girder base material between span centre and the pier beam consolidation place adopts and does apparent density is 1950kg/m
3-2300kg/m
3Fiber reinforced anti-cracking high-strength specified density concrete.
2. continuously strong bridge structure according to claim 1 is characterized in that described high strength lightweight aggregate concrete is formed through stirring by light aggregate, sand, cement, water, breeze and chemical admixture, presses kg/m
3Meter, the proportioning of each composition is respectively: light aggregate 530-590, sand 650-700, cement 470-530, water 160-175, breeze 50-100, chemical admixture adopts high efficiency water reducing agent FDN or polycarboxylic acids, high efficiency water reducing agent FDN is the 0.8-1.4% of cement consumption, and polycarboxylic acids is cement consumption 0.6-1.3%.
3. continuously strong bridge structure according to claim 1 is characterized in that fiber reinforced anti-cracking high-strength specified density concrete is formed through stirring by light aggregate, cement, sand, rubble, water, breeze, toughness reinforcing anticracking material and chemical admixture, presses kg/m
3Meter, the proportioning of each composition is respectively: light aggregate 200-250, cement 430-480, sand 650-700, rubble 580-660, water 150-165, breeze 50-100, toughness reinforcing anticracking material adopts toughness reinforcing anti-crack fiber and water-soluble polymer, and wherein toughness reinforcing anti-crack fiber adopts the compound of steel fibre or steel fibre and polypropylene fibre, and toughness reinforcing cracking resistance steel fibre composition proportion is 40-160kg/m
3, polypropylene fibre 1-2kg/m
3, water-soluble polymer is the 10-20% of cement consumption, and chemical admixture adopts high efficiency water reducing agent FDN or polycarboxylic acids, and wherein high efficiency water reducing agent FDN is the 0.8-1.4% of cement consumption, and polycarboxylic acids is cement consumption 0.6-1.3%.
4. according to claim 2 or 3 described continuously strong bridge structures, it is characterized in that light aggregate is particle diameter 5-20mm, apparent density 1200-1500kg/m
3, bulk density 700-1100kg/m
3And the leca of cylindrical compress strength 〉=6.5Mpa or haydites of book structure or lytag.
5. according to claim 2 or 3 described continuously strong bridge structures, it is characterized in that adopting specific area is 500m
2The breeze of/kg.
6. continuously strong bridge structure according to claim 3 is characterized in that water-soluble polymer is modified polyacrylic acid base polymer emulsion or modified polyvinylalcohol base polymer emulsion, and solid content is 20-60%.
7. continuously strong bridge structure according to claim 1 is characterized in that high-strength ordinary concrete is formed through stirring by cement, sand, rubble, water, breeze and chemical admixture, presses kg/m
3Meter, the proportioning of each composition is respectively: cement 430-460, sand 680-740, rubble 980-1040, water 150-165, breeze 40-80, chemical admixture adopts high efficiency water reducing agent FDN or polycarboxylic acids, wherein high efficiency water reducing agent FDN is the 0.8-1.4% of cement consumption, and polycarboxylic acids is cement consumption 0.6-1.3%.
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| CN102108787A (en) * | 2010-12-29 | 2011-06-29 | 山西四建集团有限公司 | Construction method of ultra-high strength steel fiber concrete |
| CN102505624A (en) * | 2011-10-17 | 2012-06-20 | 武汉理工大学 | Anti-cracking steel-concrete combined continuous girder bridge of negative moment region |
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| CN102505624A (en) * | 2011-10-17 | 2012-06-20 | 武汉理工大学 | Anti-cracking steel-concrete combined continuous girder bridge of negative moment region |
| CN102519569A (en) * | 2011-12-24 | 2012-06-27 | 福州大学 | Motor truck scale weighing platform with reinforcement specified density concrete structure |
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| CN103641415A (en) * | 2013-12-16 | 2014-03-19 | 中国人民解放军理工大学 | High-strength anti-cracking ceramsite concrete and preparation method thereof |
| CN104291749A (en) * | 2014-09-22 | 2015-01-21 | 华北水利水电大学 | Concrete material and preparation method thereof |
| CN104291749B (en) * | 2014-09-22 | 2016-04-27 | 华北水利水电大学 | A kind of concrete material and preparation method thereof |
| CN105621993A (en) * | 2016-02-03 | 2016-06-01 | 华南理工大学 | Steel fiber polymer concrete composite structure and preparation method and application thereof |
| CN107555895A (en) * | 2017-08-21 | 2018-01-09 | 南京理工大学 | For the functionally gradient of 3D printing and density gradient concrete material and preparation method thereof |
| CN107555895B (en) * | 2017-08-21 | 2020-04-17 | 南京理工大学 | Functional gradient and density gradient concrete material for 3D printing and preparation method thereof |
| CN111348869A (en) * | 2020-03-12 | 2020-06-30 | 中交武汉港湾工程设计研究院有限公司 | Method for forming multilayer gradient anti-crack cement-based material |
| CN111348869B (en) * | 2020-03-12 | 2021-07-30 | 中交武汉港湾工程设计研究院有限公司 | Method for forming multilayer gradient anti-crack cement-based material |
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