CN104961404A - Super-long-workability steel arch self-compacting concrete - Google Patents
Super-long-workability steel arch self-compacting concrete Download PDFInfo
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- CN104961404A CN104961404A CN201510316240.7A CN201510316240A CN104961404A CN 104961404 A CN104961404 A CN 104961404A CN 201510316240 A CN201510316240 A CN 201510316240A CN 104961404 A CN104961404 A CN 104961404A
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Abstract
The invention discloses a super-long-workability steel arch self-compacting concrete. The super-long-workability steel arch self-compacting concrete comprises, by weight, 100 parts of a gel system composed of ordinary Portland cement and ore powder with a cement/ore powder weight ratio of 2.3:1-2.4:1, 142-145 parts of continuously-graded high-quality II district medium sand with the fineness modulus of 2.5-2.7, 138-140 parts of 5-10nm single-grading cobblestones with the crush index of 4-5%, 1.0-1.1 parts of a modified polycarboxylic acid additive, 9-10 parts of an expanding agent HEA, and 30-31 parts of water. In the invention, the new ash-free gelling system is established, the modified polycarboxylic acid additive is added, the water-gel ratio is strictly controlled, and the expanding agent with an appropriate amount and an appropriate type is added, so the prepared concrete has abundant slurry feed, workability, flowability and segregation resistance, can meet a super long workability requirement, and can well meet requirements of steel arch self-compacting concretes by engineering.
Description
Technical field
The present invention relates to concrete technology, specifically refer to a kind of overlength workability steel arch self-compacting concrete.
Background technology
Steel arch concrete structure has history decades abroad, the thirties in 20th century, and the structure of this superior performance once applied in arch structure bridge by France and the Soviet Union.The nineties, along with carrying out of China's steel arch concrete structure research work, steel arch concrete obtains and applies rapidly in arch structure bridge.Steel arch concrete structure is a kind of unitized construction inserted concrete and formed in steel pipe.The characteristic of steel be intensity high, there is elastoplasticity, but easy unstability; Concrete has good anti-compression property, but fracture resistance is poor.Steel pipe and the combination both concrete, concrete can be made to be in side limit pressured state, ultimate compression strength significantly improves, simultaneously due to the existence of core concrete, improve the rigidity of steel pipe, thus substantially increasing the supporting capacity of structure, tool intensity is high, plasticity good, shock resistance is superior, antifatigue, the advantage such as shock-resistant, corrosion-resistant.
Along with the year by year increase of steel arch concrete in engineer applied, quality of materials becomes the gordian technique in construction gradually.Have certain volumetric shrinkage after concrete hardening, in order to ensure the mechanical property of steel arch concrete structure, concrete cubic deformation need be consistent with steel pipe, and this just requires that concrete has certain swelling property.And consider mechanical property and the engineering construction requirement of structure, generally there is early strong requirement to steel arch concrete.In addition, due to the construction technology of steel arch concrete many employings pumping jacking, concrete is poured in pipe by arch springing pumping, then rely on self mobility, density is poured into pipe top and is full of whole steel pipe, concrete cannot vibrate in steel arch, therefore concrete be also proposed to the requirement of high workability and self compacting ability.Workability gradual loss is excessive, and in casting process, concrete easily pipeline jam accident occurs in pipe, causes great inconvenience to construction, also may bring huge financial loss thus, needs to consider that the longest workability reaching 6 hours keeps according to this engineering characteristic.Therefore steel arch concrete is except considering the workability of microdilatancy, early strong, original state, also needs the gradual loss considering workability.Adopt upper flow regime, early concrete that is strong, microdilatancy to avoid produced problem in concrete-filled steel tube construction at present, seldom carry out particular study for concrete workability gradual loss, this is the very big hidden danger that steel arch concrete construction exists more.
Summary of the invention
Steel arch self-compacting concrete is different from conventional self-compacting concrete, its technical requirements is higher, take into account the susceptibility that self-compacting concrete fluctuates to raw material quality on the one hand, on the other hand, steel arch concrete covers whole concrete lift-up construction process to concrete slump retaining time requirement.Namely object of the present invention is to reach this technical requirements, once reforms from technological layer, reselects gelling system and proportioning, provides a kind of overlength workability steel arch self-compacting concrete.
Technical scheme of the present invention is:
A kind of overlength workability steel arch self-compacting concrete, its raw material composition and ratio is:
The gelling system 100 parts of ordinary Portland cement and breeze composition, wherein the weight proportion of cement and breeze is 2.3:1-2.4:1;
Fineness modulus is high-quality II district medium sand 142-145 part of 2.5-2.7 continuous grading;
5-10mm simple grain level, crush index is stone 138-140 part of 4-5%;
Modified polycarboxylic acid admixture 0.8-1.5 part;
Swelling agent HEA 9-10 part;
Water 30-31 part;
It is more than weight part.
The degree of mobilization ratio of described breeze is 105%, activity index 7d be 80-90%, 28d is 105-115%.
The silt content of described medium sand and stone, clod content meet JGJ52-2006 " regular concrete sand, stone quality and test method standard " requirement.
Described modified polycarboxylic acid water reducer comprises the Sunmorl N 60S of 5-15wt% and the Mierocrystalline cellulose of 5-15wt%.
Innovative point of the present invention comprises: for removing the workability of concrete fluctuating factor that active extra material flyash quality instability is brought, adopt ashless proportioning technology when mix-design; Reach requirement of strength design (design strength C50 early reaches 80% by force in 7 days) for ensureing, water-cement ratio is strict controlled in 0.30-0.31; For the requirement of overlength workability, self compacting ability, being collapsed by slow setting component sugar glucose acid sodium, guarantor, composition fiber is plain to be improved admixture.
New ashless gelling system, interpolation modified polycarboxylic acid admixture, the strict swelling agent that control water-cement ratio and suitable volume and category of the present invention by setting up, make prepared concrete grout amount abundant, there is workability, trickling property and education resistance, meet the requirement of overlength workability simultaneously, the requirement of engineering to steel arch self-compacting concrete can be met well.
Embodiment
Embodiment:
Table 1 is the concrete proportioning of the present embodiment:
Table 1
| Starting material | Water | Cement | Breeze | Fine aggregate | Coarse aggregate | Swelling agent | Admixture |
| Specification | Tap water | 42.5PO | S95 | Medium sand | 5-10mm | HEA | Modified polycarboxylic acid |
| Folk prescription consumption | 175 | 400 | 170 | 816 | 800 | 57 | 6.27(1.1％) |
After tested, concrete work performance:
Workability: fresh concrete workability is good, without bleeding, without floating ash, static rear without bleeding;
The slump: fresh concrete initial slump 260mm;
Time of coagulation: in 8 hours presetting periods, final setting time is about 12h.
After tested, concrete self-compacting ability:
The slump 260 ~ 280mm, divergence 760 ~ 850mm, T
500≤ 5s, decay flow velocity≤5s; Through time 6 hours slump divergences be 550 ~ 655mm, decay flow velocity≤10s.
In TL-2 type Flow Meter, concrete successfully passes the horizontal levelling of reinforcing mat from column cap, concrete performance index:
● the 40mm that rises as high as the banks trickles time T40≤15s;
● vertical tube falling head T >=240mm;
● concrete trickling maximum length L >=1000mm;
U-shaped instrument concrete highness change concrete≤30mm
After tested, this formula steel pipe self-compacting concrete 7d ultimate compression strength about 80%, 14d can reach 110%, 28d and can reach 120%.
The ultimate compression strength of concrete filled steel tube
After tested, this engineering steel pipe self-compacting concrete used has the performance of microdilatancy, and 14d limited expansion rate is 1.6*10
-4, 28d confined shrinkage rate is 2.0*10
-4, meet construction and design requirements.(design requirements: 14d limited expansion rate should be greater than 1.5*10
-4, 28d confined shrinkage rate should be less than 3.0*10
-4).
Concrete filled steel tube confined expansion (contraction) rate
Steel arch concrete refers in the steel arch structure in bridge construction, uses slightly expanded concrete dense packing effect, reaches the effect of firm bridge structure.Bridge steel arch concrete is that span is large, the scale of construction large, difficulty of construction high, normal concrete does not possess the workabilities such as large fluidised form, dense packing effect, jack-block construction technology cannot be applicable at all, and conventional self-compacting concrete, do not possess the overlength workabilities such as high slow setting high-thin arch dam, bring greater risk to construction operation yet.Not only trickling property is good for overlength workability steel arch self-compacting concrete of the present invention, and fillibility is strong, and have guarantor's ability of collapsing strong, the slow setting time is long, does not emanate, and not sedimentation, does not harden, and ensure that jack-block concretely to be built in constructing smoothly.
Claims (4)
1. an overlength workability steel arch self-compacting concrete, is characterized in that, its raw material composition and ratio is:
The gelling system 100 parts of ordinary Portland cement and breeze composition, wherein the weight proportion of cement and breeze is 2.3:1-2.4:1;
Fineness modulus is high-quality II district medium sand 142-145 part of 2.5-2.7 continuous grading;
5-10mm simple grain level, crush index is stone 138-140 part of 4-5%;
Modified polycarboxylic acid admixture 0.8-1.5 part;
Swelling agent HEA 9-10 part;
Water 30-31 part;
It is more than weight part.
2. overlength workability steel arch self-compacting concrete according to claim 1, is characterized in that, the degree of mobilization ratio of described breeze is 105%, activity index 7d be 80-90%, 28d is 105-115%.
3. overlength workability steel arch self-compacting concrete according to claim 1, is characterized in that, the silt content of described medium sand and stone, clod content meet JGJ52-2006 " regular concrete sand, stone quality and test method standard " requirement.
4. overlength workability steel arch self-compacting concrete according to claim 1, it is characterized in that, modified polycarboxylic acid water reducer comprises the Sunmorl N 60S of 5-15wt% and the Mierocrystalline cellulose of 5-15wt%.
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|---|---|---|---|
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101186476A (en) * | 2007-12-21 | 2008-05-28 | 中铁二局股份有限公司 | Non-fragment orbit self-leveling concrete |
| CN101462862A (en) * | 2009-01-05 | 2009-06-24 | 上海市建筑构件制品有限公司 | Steel pipe core high dropping self-compaction concrete and use thereof |
| CN101580354A (en) * | 2009-06-12 | 2009-11-18 | 福建科之杰新材料有限公司 | Polycarboxylic retarding high-performance water reducing agent for preparing concrete of middle and low strength grade |
| CN101767966A (en) * | 2010-01-22 | 2010-07-07 | 中铁十七局集团有限公司 | Self-compacting concrete for turnout junction of ballastless track |
| CN103086635A (en) * | 2013-02-25 | 2013-05-08 | 十九冶成都建设有限公司 | Pumping agent and application thereof |
-
2015
- 2015-06-10 CN CN201510316240.7A patent/CN104961404A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101186476A (en) * | 2007-12-21 | 2008-05-28 | 中铁二局股份有限公司 | Non-fragment orbit self-leveling concrete |
| CN101462862A (en) * | 2009-01-05 | 2009-06-24 | 上海市建筑构件制品有限公司 | Steel pipe core high dropping self-compaction concrete and use thereof |
| CN101580354A (en) * | 2009-06-12 | 2009-11-18 | 福建科之杰新材料有限公司 | Polycarboxylic retarding high-performance water reducing agent for preparing concrete of middle and low strength grade |
| CN101767966A (en) * | 2010-01-22 | 2010-07-07 | 中铁十七局集团有限公司 | Self-compacting concrete for turnout junction of ballastless track |
| CN103086635A (en) * | 2013-02-25 | 2013-05-08 | 十九冶成都建设有限公司 | Pumping agent and application thereof |
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Application publication date: 20151007 |