CN107721321A - A kind of machine-made sand self-compacting concrete applied to box girder with corrugated steel webs - Google Patents
A kind of machine-made sand self-compacting concrete applied to box girder with corrugated steel webs Download PDFInfo
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- CN107721321A CN107721321A CN201711165145.7A CN201711165145A CN107721321A CN 107721321 A CN107721321 A CN 107721321A CN 201711165145 A CN201711165145 A CN 201711165145A CN 107721321 A CN107721321 A CN 107721321A
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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
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- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention belongs to building material field, refers specifically to a kind of machine-made sand self-compacting concrete applied to box girder with corrugated steel webs, the raw material containing following weight ratio example：431~447 parts of cement, 78~85 parts of flyash, 637~655 parts of Machine-made Sand, 1097~1112 parts of 5~20mm Stones, 4.7~5.1 parts of water reducer, 165 parts of water.The area's Machine-made Sand of continuous grading II of the Machine-made Sand, modulus of fineness are 2.7~3.0, MB values ＜ 1.4, and content of stone powder is 6%~8%.The rubble is continuous grading rubble, and the rubble mass ratio of contained 5~10mm Stones and 10~20mm particle diameters is 3：7.The concrete is prepared with well-graded Machine-made Sand instead of river sand, has good service behaviour, and mobility, filling capacity are good, and has higher mechanical strength, disclosure satisfy that the requirement that pours of corrugated steel web plate composite box girder, also relatively inexpensive in cost.
Description
Technical field
The invention belongs to building material field, refers specifically to a kind of machine-made sand self-compacting applied to box girder with corrugated steel webs
Concrete.
Background technology
The combining structure pattern of box girder with corrugated steel webs is complicated and species is various, concrete roof, bottom plate and the ripple of box beam
The connecting portion construction of shape steel web is complicated and arrangement of reinforcement is intensive, is difficult to carry out and vibrates in casting process, therefore to the stream of concrete
Dynamic performance and self-compacting ability propose high requirement, and cast-in-situ box girder uses normal concrete more at present, and viscosity is big and flows
Dynamic poor-performing, the pouring construction of the more complicated concrete component of structure is not suitable for it, it is therefore necessary to for Wavelike steel webplate
Box beam researches and develops special concrete.
The gel material content of common self-compacting concrete is larger, and manufacturing cost is apparently higher than normal concrete.In addition from
Nowadays preceding widely used river sand in concrete formulation has been exploited totally, the price height of commodity river sand, quality are unstable, and
Supply fluctuation is larger, easily influences the construction period, increases construction costs.Machine-made Sand is increasingly becoming the main of river sand at present
Substitute, the raw material sources of Machine-made Sand are extensive, and sand grains is cleaned without shale, and has more preferable particle shape and rational grading, contained
A small amount of stone flour can also act as binder materials, can reduce the dosage of cement, therefore prepare self-compacting concrete with Machine-made Sand to have
Obvious cost advantage and preferable application value.
The content of the invention
The present invention have developed a kind of machine-made sand self-compacting concrete for the pouring construction of box girder with corrugated steel webs, have
There are good mobility and self compacting ability.
Machine-made sand self-compacting concrete of the present invention applied to box girder with corrugated steel webs contains following weight ratio example
Raw material：
431~447 parts of cement, 78~85 parts of flyash, 637~655 parts of Machine-made Sand, 5~20mm Stones 1097~
1112 parts, 4.7~5.1 parts of water reducer, 165 parts of water.
The Machine-made Sand is the area's Machine-made Sand of continuous grading II, and modulus of fineness is 2.7~3.0, MB values ＜ 1.4, contained stone flour
Account for the 6%~8% of Machine-made Sand gross weight.The rubble is continuous grading rubble, contained 5~10mm Stones and 10~20mm
The rubble mass ratio of particle diameter is 3：7.
The steady quality of Machine-made Sand, cheap and energy-conserving and environment-protective.The concrete prepared using above-mentioned Machine-made Sand has good
Good berth, mechanical property and volume stability, and good endurance, steady quality.
An optimum ratio as the machine-made sand self-compacting concrete of the present invention applied to box girder with corrugated steel webs
Scheme, the part by weight of each component are：
438 parts of cement, 79 parts of flyash, 647 parts of Machine-made Sand, 1102 parts of rubble, 4.9 parts of water reducer, 165 parts of water.
Preferably, the Machine-made Sand is that particle size range is further broken up into particle diameter through sand making machine in 5~13mm rubble and existed
Below 4mm coarse sand, then the manufactured Machine-made Sand after gumming is handled.
In the production process of Machine-made Sand, the rubble size into sand making machine is most easily ignored, if entering machine rubble
Granularity is excessive, and the sand not only made is thick and grading is bad, and yields poorly, high energy consumption；If enter machine undersized, not only
The fineness of sand is thin, and content of stone powder is big.It is above-mentioned enter machine ballast grain sizes scope be that preferred scope is determined by test of many times,
The preferable Machine-made Sand of quality can be obtained with the rubble charging of the particle size range, and advantageously reduce the energy consumption of sand making machine simultaneously
Control production cost.
The cement is PO42.5 cement.
The flyash is I grade of flyash of F classes.
The water reducer is polycarboxylate water-reducer.
The selection of above-mentioned machine-made sand self-compacting concrete each component and proportioning are determined by lot of experiments, and
The manufacturability of concrete prepared by the present invention disclosure satisfy that the technical requirements of C55 concrete.
Machine-made sand self-compacting concrete of the present invention applied to box girder with corrugated steel webs is with well-graded Machine-made Sand
Prepared instead of river sand, there is good service behaviour, mobility, filling capacity are good, and strong with higher mechanics
Degree, disclosure satisfy that the requirement that pours of corrugated steel web plate composite box girder, also relatively inexpensive in cost.
Brief description of the drawings
Fig. 1：The grading curve figure for the self-control Machine-made Sand that embodiment 1 uses；
Fig. 2：The grading curve figure of river sand；
Fig. 3：With 1 corresponding concrete sample of embodiment and the outside drawing of corrugated steel web；
Fig. 4：With the local appearance picture of 1 corresponding concrete sample of embodiment；
Fig. 5：The local appearance picture of concrete sample corresponding with comparative example.
Embodiment
With reference to specific embodiment and related experiment to the Machine-made Sand of the present invention applied to box girder with corrugated steel webs
Self-compacting concrete is described further.Water reducer, rubble, flyash and the cement used in the following example and comparative example
All same.The polycarboxylic acid special superplasticizer HP400 that water reducer produces for Shanghai Hua Deng building materials Co., Ltd, the water reducer
Meet GB 8076-2008, solid content 22.7%, water-reducing rate 27%, total alkali 2.89%, chloride ion content is
0.037%.
Rubble comes from Ruicheng County Cheng Lei building stones Co., Ltd, meets JTG/T F50-2011, the grading of coarse aggregate for 5~
20mm, and be continuous grading, the rubble mass ratio of contained 5~10mm Stones and 10~20mm particle diameters is 3：7, it is apparent close
Spend for 2833kg/m3, bulk density 1610kg/m3, clay content 0.6%, clod content is 0.4%, and flat-elongated particles contain
Measure as 4.2%.The sieve test result of the rubble is：All being sieved by 26.5mm, the accumulation screen over-size of 19mm sieves is 3.0%,
The accumulation screen over-size of 16mm sieves is that the accumulation screen over-size of 11.7%, 9.5mm sieves is the accumulation screen over-size of 63.5%, 4.75mm sieves
Accumulation screen over-size for 94.4%, 2.36mm sieves is 99.1%.
Flyash is plant residue, meets the requirement of GB/T 1596-2008 I grade of flyash of F classes, fineness 5.4%,
Loss on ignition is 2.7%, water content 0.1%, water demand ratio 92%；
Cement is the P.O42.5 cement of Wei Dun Cement Groups Co., Ltd production, and quality meets wanting for GB 175-2007
Ask, its performance parameter is：Density 3.13g/cm3, specific surface area 352m2/ kg, presetting period 160min, final setting time
230min, rupture strength (3d/28d)：4.1MPa, 8.6MPa；Compression strength (3d/28d)：26.1MPa 53.5MPa.
Embodiment 1
Take PO42.5 cement 438kg, flyash 79kg, Machine-made Sand 647kg, 5~20mm Stone 1102kg, poly- carboxylic
40L or so, which is produced, after sour water reducer 4.9kg and 165kg water input stirrer for mixing is uniform is applied to box girder with corrugated steel webs
Machine-made sand self-compacting concrete sample.
The Machine-made Sand that the present embodiment uses voluntarily is prepared as raw material using Ruicheng County treasured Tai Kaicaikuangshichang building stones
, specifically building stones are crushed and sieved with jaw crusher take the rubbles of 5~13mm particle diameters, using vertical shaft impact crusher
The rubble filtered out is processed into coarse sand as sand making machine, then sieve takes the coarse sand of below 4mm particle diameters to be obtained after dry method gumming
Machine-made Sand finished product.The modulus of fineness of the Machine-made Sand finished product is that 2.8, MB values are 1.2, content of stone powder 6.7%, and apparent density is
2710kg/m3, bulk density 1622kg/m3, clod content is 0.4%.The Machine-made Sand meets JTG/T F50-2011, screening
Result of the test is：All sieved by 9.5mm, the accumulative screen over-size of 4.75mm sieves is the accumulative screen over-size of 0.3%, 2.36mm sieves
Accumulative screen over-size for 11.3%, 1.18mm sieves is that the accumulative screen over-size of 35.4%, 0.6mm sieves is what 61.4%, 0.3mm was sieved
Accumulative screen over-size is that the accumulative screen over-size of 81.8%, 0.15mm sieves is 91.0%.
Fig. 1 and Fig. 2 is respectively the Machine-made Sand finished product and the grading curve figure of river sand (originating from Henan river sand field), is contrasted
Fig. 1 and Fig. 2 understands that the grading of the Machine-made Sand is good and close to II area's grading median profile, compared to the coarse granule contained by river sand
It is less, and grading situation is closer to, completely can be as the substitute of river sand.
Embodiment 2
Take PO42.5 cement 431kg, flyash 85kg, Machine-made Sand 653kg, 5~20mm Stone 1097kg, diminishing
The mechanism that 40L or so is applied to the firm web box girder of waveform is produced after agent 4.7kg and 165kg water input stirrer for mixing are uniform
Sand self-compacting concrete sample.
The Machine-made Sand used in the present embodiment is the raw material for using source same as Example 1 with identical equipment and side
Method is from the Machine-made Sand made, and the modulus of fineness for obtaining Machine-made Sand finished product is that 2.7, MB values are 1.0, content of stone powder 7.3%.
Embodiment 3
Take PO42.5 cement 442kg, flyash 82kg, Machine-made Sand 637kg, 5~20mm Stone 1112kg, diminishing
The mechanism that 40L or so is applied to the firm web box girder of waveform is produced after agent 5.1kg and 165kg water input stirrer for mixing are uniform
Sand self-compacting concrete sample.
The Machine-made Sand used in the present embodiment is the raw material for using source same as Example 1 with identical equipment and side
Method is from the Machine-made Sand made, and the modulus of fineness of obtained Machine-made Sand finished product is that 2.9, MB values are 0.7, content of stone powder 6%.
Embodiment 4
Take PO42.5 cement 447kg, flyash 82kg, Machine-made Sand 655kg, 5~20mm Stone 1097kg, diminishing
The mechanism that 40L or so is applied to the firm web box girder of waveform is produced after agent 5.0kg and 165kg water input stirrer for mixing are uniform
Sand self-compacting concrete sample.
The Machine-made Sand used in the present embodiment is the raw material for using source same as Example 1 with identical equipment and side
Method is from the Machine-made Sand made, and the modulus of fineness of obtained Machine-made Sand finished product is that 3.0, MB values are 0.8, content of stone powder 8%.
Comparative example
Take PO42.5 cement 427k, flyash 95kg, Machine-made Sand 656kg, 5~20mm Stone 1077kg, water reducer
The Machine-made Sand that 40L or so is applied to the firm web box girder of waveform is produced after 5.0kg and 165kg water input stirrer for mixing is uniform
Self-compacting concrete sample.
The Machine-made Sand used in comparative example is commercially available finished product Machine-made Sand, and modulus of fineness 2.9, MB values are 0.7, and stone flour contains
Measure as 6%.
Concrete performance checking test
According to box girder with corrugated steel webs Concrete Design and construction requirement, the C55 machine-made sand self-compacting concretes of use
Mix physical performance need to meet JGJ/T 283-2012《Self-compacting concrete application technology code》First class index requirement, is referred specifically to
Mark project and acceptability limit are as shown in table 1.
Table 1：C55 machine-made sand self-compacting concrete technical indicators
Note：Anti-Chloride Ion Penetration grade classification uses《Standard for quality control of concrete》(GB50154-2011) it is electric in
Flux method.
SF1 level self-compacting concrete technological property tests are carried out to the concrete prepared in each embodiment and comparative example
With common C55 concrete making technologies performance test (GB/T50080-2016), pilot project includes slump flow test, J rings extend
Degree, compression strength, elasticity modulus test and resisting chloride ion penetration experiment, as a result as shown in table 2 and table 3.Can from table 2 and table 3
Go out, machine-made sand self-compacting concrete property indices meet technical requirements made from each embodiment, and are substantially better than contrast
Example, machine-made sand self-compacting concrete made from comparative example have part index number to be required up to can not still reach above-mentioned performance indications.
Table 2：The workability of concrete
Table 3：Mechanical performance of concrete and seepage-resistant grade
Corrugated steel web is connected by being partly anchored in realization in concrete structure with box beam top plate and bottom plate, therefore is passed through
Adaptability of the concrete to actual pouring construction condition can effectively be investigated by setting simulation to pour experiment.Simulation is poured in experiment
Concrete sample mould is made with the shape of corrugated steel web, and in casting process is locally embedded in corrugated steel web mixed
Coagulate in native test specimen, the concrete in experiment respectively according to match ratio allotment described in embodiment 1 and comparative example carries out pouring for test specimen
Build.Concrete is transported to job site after being discharged from facilities of mix storied building by transport vehicle, then is pumped to pier top test specimen through delivery pipe by drag pump
At mould.For simulation cast in situs construction, primary concreting to formwork elevation measuring, vibrated without any in casting process.
Form removal is carried out to test specimen after concrete hardening and checks the surface quality of concrete sample, corresponding to embodiment 1
Concrete sample overall structure as shown in figure 3, office corresponding to embodiment 1 and the concrete sample same position of comparative example
Portion's surface condition is distinguished as shown in Figure 4,5, there it can be seen that test specimen concrete corresponding to embodiment 1 is held in the mouth with Wavelike steel webplate
Connecing well, concrete does not have the Appearance quality defects such as obvious bubble and voids and pits at chamfering, and overall appearance quality is good, and
Surface is smooth, uniform color, and surface of test piece hole corresponding compared to comparative example is less, and aperture is also smaller.
The concrete for pouring test specimen is kept sample, tests 7 days, the cube of 28 day age of two kinds of concrete that keep sample
Compression strength, result of the test is as shown in table 4, as can be seen from Table 4,7 days of the concrete that keeps sample corresponding with embodiment 1 and
Compression strength is respectively greater than 55MPa and 64.9MPa within 28 days, can meet C55 machine-made sand self-compacting concrete technical requirements,
And the concrete that keeps sample corresponding with comparative example can not then meet design requirement.
Table 4：Compressive strength of concrete result of the test
Whether the concrete solid intensity for further checking test specimen meets technical requirement, in 28d ages to examination
Part carry out everywhere core boring sampling (the corresponding mark that sample position is seen in Fig. 3) and according to《Highway engineering cement and cement concrete
Testing regulations》(JTG E30-2005) is measured for the solid strength of core sample, as a result as shown in table 5.Test specimen is not in table 5
Compression strength average value with position core sample coincide with the data in table 4, shows the testing result of test specimen concrete crushing strength
Accurately and reliably.
Table 5：Test specimen core sample 28d compressive strength test results
The concrete for pouring test specimen is kept sample, foundation《Standard for quality control of concrete》(GB50154-2011) divide
Ce Shi not keep sample the electric flux of 28 day age of concrete, and result of the test is as described in Table 6.As can be seen from Table 6, with embodiment 1
28 days electric fluxes of the corresponding concrete that keeps sample meet the grades of QC- IV (500~1000C) of electric flux law regulation, and and comparative example
The corresponding concrete that keeps sample only reaches the grades of QC- III (1000~2000C).
Whether the concrete solid resistance of chloride ion penetration for further checking test specimen meets to require, in 28d ages pair
Test specimen carry out everywhere core boring sampling (the corresponding mark that sample position is seen in Fig. 3) and according to《Standard for quality control of concrete》
(GB50154-2011) electric flux of core sample is detected, as a result as shown in table 7.As known from Table 7, with 1 corresponding test specimen of embodiment not
With the grades of QC- IV of electric flux law regulation in the core sample 28d electric fluxes satisfaction of position, than the correlation of test specimen corresponding to comparative example
Performance is more preferable.
Table 6：Concrete charge pass result of the test
Table 7：Test specimen core sample electric flux is tested
Claims (6)
1. a kind of machine-made sand self-compacting concrete applied to box girder with corrugated steel webs, it is characterised in that contain following weight ratio
The raw material of example：
431~447 parts of cement, 78~85 parts of flyash, 637~655 parts of Machine-made Sand, 5~20mm Stones 1097~1112
Part, 4.7~5.1 parts of water reducer, 165 parts of water；
The Machine-made Sand is the area's Machine-made Sand of continuous grading II, and modulus of fineness is 2.7~3.0, MB values ＜ 1.4, and contained stone flour accounts for machine
The 6%~8% of sand gross weight processed；The rubble is continuous grading rubble, contained 5~10mm Stones and 10~20mm particle diameters
Rubble mass ratio is 3：7.
2. it is applied to the machine-made sand self-compacting concrete of box girder with corrugated steel webs as claimed in claim 1, it is characterised in that contain
There is the raw material of following weight ratio example：
438 parts of cement, 79 parts of flyash, 647 parts of Machine-made Sand, 1102 parts of rubble, 4.9 parts of water reducer, 165 parts of water.
3. being applied to the machine-made sand self-compacting concrete of box girder with corrugated steel webs as claimed in claim 1 or 2, its feature exists
In the Machine-made Sand is that rubble of the particle size range in 5~13mm is further broken up into coarse sand of the particle diameter in below 4mm through sand making machine
Afterwards again through gumming handle made of Machine-made Sand.
4. being applied to the machine-made sand self-compacting concrete of box girder with corrugated steel webs as claimed in claim 1 or 2, its feature exists
In the cement is PO42.5 cement.
5. being applied to the machine-made sand self-compacting concrete of box girder with corrugated steel webs as claimed in claim 1 or 2, its feature exists
In the flyash is I grade of flyash of F classes.
6. being applied to the machine-made sand self-compacting concrete of box girder with corrugated steel webs as claimed in claim 1 or 2, its feature exists
In the water reducer is polycarboxylate water-reducer.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113526932A (en) * | 2021-09-07 | 2021-10-22 | 中铁十一局集团桥梁有限公司 | Concrete for sleeper |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104230223A (en) * | 2014-08-22 | 2014-12-24 | 中铁二局股份有限公司 | High-strength and vibration-free self-compacting concrete prepared from machine-made sand |
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- 2017-11-21 CN CN201711165145.7A patent/CN107721321A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104230223A (en) * | 2014-08-22 | 2014-12-24 | 中铁二局股份有限公司 | High-strength and vibration-free self-compacting concrete prepared from machine-made sand |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113526932A (en) * | 2021-09-07 | 2021-10-22 | 中铁十一局集团桥梁有限公司 | Concrete for sleeper |
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Application publication date: 20180223 |