CN105256709B - Ultra-high performance cement-based pi-shaped girder poured with ultra-high performance cement-based composite - Google Patents
Ultra-high performance cement-based pi-shaped girder poured with ultra-high performance cement-based composite Download PDFInfo
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- CN105256709B CN105256709B CN201510713664.7A CN201510713664A CN105256709B CN 105256709 B CN105256709 B CN 105256709B CN 201510713664 A CN201510713664 A CN 201510713664A CN 105256709 B CN105256709 B CN 105256709B
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Abstract
The invention relates to an ultra-high performance cement-based pi-shaped girder poured with an ultra-high performance cement-based composite. The pi-shaped girder meets the following conditions: H1/B1 is equal to (0.2-1); T1/H1 is equal to (0.01-0.3); T2/B3 is equal to (0.1-0.5); B2/B1 is equal to (0.2-0.8); B3/B2 is equal to (0.1-0.5); T2/H1 is equal to (0.02-0.2); R2/R1 is equal to (0.3-0.8); R3/R2 is equal to (0.1-0.5); B1 is larger than or equal to 1500 mm and is smaller than or equal to 5000 mm; H1 is larger than or equal to 500 mm and is smaller than or equal to 3000 mm; the span L is equal to (10-200 m). According to the ultra-high performance cement-based pi-shaped girder, the grain composition of multielement cementing materials and grain composition of aggregates are optimized, and a chemical additive is used, so that the compressive strength reaches 170 MPa or above under standard curing for 28 d under the precondition that the material has good fluidity; the ultra high strength cement-based composite and a high strength rib material are adopted, the construction is reasonable, and the design is optimized, so that the whole component has the characteristics that light weight and durability are achieved, the upper structure and the deck slab are integrated, and quick prefabrication and assembly can be achieved, while the bearing capacity is guaranteed; the ultra-high performance cement-based pi-shaped girder can be applicable to quick construction of small-sized and medium-sized bridges in the fields of highways and railways.
Description
Technical field
The present invention relates to a kind of lightweight, high-strength π ellbeams body, in particular, are related to one kind and are answered by ultrahigh-performance cement-based
The ultrahigh-performance cement-based π ellbeams that condensation material is poured.
Background technology
Using armored concrete or prestressed reinforced concrete more than the girder construction of the field such as highway, railway medium and small bridges
The hollow slab girder of structure, T beams or box beam, wherein in the majority with hollow slab beam structure in highway medium and small bridges, East China is hollow
Slab and girder at least accounting more than 80%, hollow slab girder applies in general to bridge of the across footpath between 8～20m, and T beams are applied to
Single hole across footpath is between 30～40m, and the scope of application of box beam is then relatively wide.Normal concrete is cheap and easy to get due to its, becomes
The primary structural material of girder construction (including hollow slab girder, T beams and box beam), but its shortcoming is also very significantly, such as：(1) intensity
It is low, cause physical dimension it is big, from great, long construction period；(2) fragility is big, poor toughness, crack easily occurs, becomes erosion and is situated between
Matter enters the approach of inside concrete；(3) poor durability, is not embodied in that infiltration coefficient is big, anti-freezing property is poor, corrosion-resistant etc.；(4)
Fatigue performance is poor, easily occurs fatigue crack under cyclic reverse loading.China has begun to large-scale bridge since the reform and opening-up
Build, build together within past 30 years and made ten thousand bridge block more than 50, there are various types of diseases according to incomplete investigation statisticses, nearly 1/4,
It is directed to occupy larger proportion to the disease of beam body, including it is the cracking of beam, breakage, salt corrosion, steel bar corrosion, downwarp, pre-
Stress loss, seam seepage etc., the maintenance reinforcing expense in later stage is surprising, and expense is reinforced in the maintenance of single seat bridge can exceed to the greatest extent construction
Expense, for the beam body of well damage needs to re-replace, now needs to cut deck paving and floorings and uses main equipment
Heavy beam body could be removed, expense is surprising, from the point of view of the Life cycle of girder construction, the relatively low reinforcing bar of construction cost
Concrete Liangqi economy is had a greatly reduced quality.At present bridge construction needs a kind of high-strength light, durability height, construction period
The low new girder construction of short, maintenance cost improves the overall military service of bridge overcoming the various drawbacks of existing girder construction
Energy, security performance and service life.
The content of the invention
In order to solve the problems referred to above of prior art presence, it is an object of the invention to provide one kind is by ultrahigh-performance cement-based
The ultrahigh-performance cement-based π ellbeams that composite is poured.
The ultrahigh-performance cement-based π ellbeams poured by ultra high performance cementitious of the present invention, the π ellbeams are by pushing up
Plate (1), the web (2) being arranged symmetrically and ball edge (3), high-strength muscle material (4) are constituted, and the depth of beam is set to into H1, top board (1) it is wide
Degree is set to B1, top board (1) thickness be set to T1, web (2) thickness be set to T2, ball edge (3) inner side spacing be set to B2, ball edge (3) height
It is set to H2, ball edge (3) width be set to B3, top board (1) and web (2) inner side chamfering radius be set to R1, top board (1) and web (2) outward
Side chamfer radius and web (2) and ball edge (3) chamfer radius are set to R2, ball edge (3) top edge chamfer radius be set to R3, girder span
When degree is set to L, meet：H1/B1=0.2～1；T1/H1=0.01～0.3；T2/B3=0.1～0.5；B2/B1=0.2～0.8；
B3/B2=0.1～0.5；T2/H1=0.02～0.2；R2/R1=0.3～0.8；R3/R2=0.1～0.5；1500mm≤B1≤
5000mm；500mm≤H1≤3000mm；L=10m～200m；
The ultrahigh-performance cement-based π ellbeams are poured by ultra high performance cementitious and formed；The very-high performance
Cement-base composite material includes Binder Materials, additive and water, and the Binder Materials are cement and mineral admixture, the cement
It is 42.5 and PI, PII or PO code name cement of the above for strength grade, the mineral admixture is silicon ash, flyash
Or two or three of breeze；
Wherein, cement consumption accounts for the 20～70% of ultra high performance cementitious volume, and the mineral admixture is accounted for
The 10～60% of ultra high performance cementitious volume；
The proportioning fraction of the Binder Materials each component is tired out by the preferable particle diameter for piling up curve and Binder Materials each component
Meter distribution curve carries out numerical analysis；
1) the preferable curve equation of piling up is：
Psd=A+ (1.00-A) (d/Dmax)π/2e；
Wherein, PsdFor the percentage ratio that granule passes through sieve aperture, A is empirical, and d is sieve diameter, DmaxFor the maximum of granule
Particle diameter；
The value of empirical A is required according to the design slump or design divergence of ultra high performance cementitious
Determined by formula：
As h≤220mm, A=5h/h0,
As h ＞ 220mm, A=5 (l-h)/h0,
L be divergence design load, h be slump design load, h0For the height 300mm of slump bucket；
2) the particle diameter cumulative distribution curve of Binder Materials each component：
Respective cumulative distribution is obtained to the component cement needed for Binder Materials, silicon ash, flyash and breeze Jing test
Curve fc(d)、fsf(d)、ffa(d) and fbs(d)；
3) numerical analysis are as follows：
If it is X that cement accounts for the volume fraction of binder total amountc, silicon ash account for binder total amount volume fraction be Xsf、
It is X that flyash accounts for the volume fraction of binder total amountfaThe volume fraction for accounting for binder total amount with breeze is Xbs, and meet Xc
∈[0.250,0.875]、(Xsf+Xfa+Xbs)∈[0.125,0.750]、Xc+Xsf+Xfa+Xbs=1；
Set mixing after Binder Materials particle diameter cumulative distribution curve as：
P=Xcfc(d)+Xsffsf(d)+Xfaffa(d)+Xbsfbs(d),
Volume fraction X to each componentc、Xsf、XfaAnd XbsWith 0.001～0.01 as step-length, in respective span
Exhaustive computations P, comparison curvess P and Psd, the standard deviation of the abscissa particle diameter d corresponding to identical vertical coordinate is calculated, take standard deviation most
Little Xc、Xsf、XfaAnd XbsIt is worth each group distribution ratio fraction as Binder Materials；
The consumption of water is 0.1～0.4 with the mass ratio W/B of Binder Materials, and wherein W represents the consumption of water, and B represents gelling material
Material quality；
After ultra high performance cementitious by gained proportioning preparation is calculated are mixed and stirred, flowability properties are as follows：
Slump GB/T50080： ≥10mm；
Or divergence GB/T 50080： ≥450mm；
The value of divergence is just tested only when high fluidity is slump ＞ 220mm, and now concrete flowability is expanding
The latitude of emulsion is defined；
Performance is as follows after hardened material：
Comprcssive strength, standard curing 28d： ≥170MPa.
As preferred technical scheme：
Described ultrahigh-performance cement-based π ellbeams, the vertical coordinate is chosen according to the grade of maximum 100% point, at least takes 5
Value；Described W/B is 0.12 to 0.28；The cement meets GB《Common portland cement》GB175；The silicon ash meets
《Mortar and concrete silicon ash》GB/T 27690；The flyash meets《For cement and the flyash of concrete》GB/T
1596；The breeze meets《For the ground granulated blast furnace slag in cement and concrete》GB/T 18046；Water meets《Concrete
Water supply standard》JGJ 63；The super additive is water reducer, defoamer, thickening agent, early strength agent, retarder or economization agent
One or several combination, from the water reducer of water-reducing rate more than 25%, volume is the Binder Materials quality to water reducer
0.5%～5%, defoamer volume for Binder Materials 0.08%～2%, thickening agent volume for Binder Materials 0.005%～
0.5%, retarder volume is cement material 0.005%～1.5%, and economization agent volume is the 0.1%～5% of Binder Materials.
Described ultrahigh-performance cement-based π ellbeams, the water-reducing rate of the water reducer is more than 30%, and volume is the gelling
The 0.8%～3% of quality of materials.
Described ultrahigh-performance cement-based π ellbeams, also add aggregate in the ultra high performance cementitious, be thin
The mixture of aggregate or fine aggregate and coarse aggregate；The aggregate is 0.5～2.5 with the volume ratio of the Binder Materials；
Fine aggregate is natural sand or artificial sand, and modulus of fineness is 1.2～3.5, and bulk density is 1.1～2.1g/cm3；Table
Sight density is 1.8～3.0g/cm3；
Coarse aggregate is rubble or cobble, and particle diameter is 5～15mm；Bulk density is 1.1～2.1g/cm3；Apparent density is
1.8～3.0g/cm3；
For the aggregate using continuous grading, when preparing the mixture of fine aggregate and coarse aggregate, fine aggregate is calculated just
The sand coarse aggregate ratio value in filling coarse aggregate space, with the ratio that this sand coarse aggregate ratio value determines coarse aggregate and fine aggregate；
For the aggregate using gap grading, the ratio of aggregate is by the preferable cumulative distribution for piling up curve and various aggregates
Curve carries out numerical analysis；
1) the accumulation curve equation is：
PsbA=B+ (100-B) (dA/DAmax)π/2e；
Wherein, PsdAFor the percentage ratio that particles of aggregates passes through sieve aperture, b is aggregate empirical, dAFor aggregate sieve diameter,
DAmaxFor the maximum particle diameter of particles of aggregates；
The value of empirical b requires to pass through formula according to the slump or divergence of ultra high performance cementitious
It is determined that：
As h≤220mm, b=5h/h0,
As ＞ 220mm, b=5 (l-h)/h0,
L be divergence design load, h be slump design load, h0For the height 300mm of slump bucket；
2) the granule cumulative distribution curve of various aggregates：
Test screened to the sand and stone needed for aggregate obtains respective cumulative distribution curve fsm(d) and frn(d)；
fsm(d) be m# graded sands, m=1～5；
frnD () is that n# levels match somebody with somebody stone, n=1～5；When stone is not needed, then the cumulative distribution curve of stone is not considered；
3) numerical analysis are as follows：
If it is X that m# graded sands account for the volume fraction of aggregate total amountsmAnd n# levels are with the volume fraction that stone accounts for aggregate total amount
XrN, and meet；
Set mixing after aggregate particle diameter cumulative distribution curve as：
PA=Σ XAnfAn(d)；
Volume fraction X to each componentsmAnd XrnWith 0.001～0.05 as step-length, the exhaustive meter in respective span
Calculate PA, comparison curvess PAAnd PsdA, calculate the abscissa particle diameter d corresponding to identical vertical coordinateAStandard deviation, take standard deviation minimum
XsmAnd XrnIt is worth each group distribution ratio fraction as aggregate.
Described ultrahigh-performance cement-based π ellbeams, the vertical coordinate is chosen according to the grade of maximum 100% point, at least takes 5
Value；The modulus of fineness of the fine aggregate is 2.4～2.8；The rubble is basalt or granite.
Described ultrahigh-performance cement-based π ellbeams, also add fiber in the ultra high performance cementitious, described
Fiber is steel fibre or non-metallic fibers, non-metallic fibers be vinal, polyethylene fibre, polypropylene fibre, poly- third
Alkene nitrile fiber, polyester fiber, nylon fiber, cellulose fibre, carbon fiber, glass fibre or basalt fibre, account for the superelevation
The 0.05%～5% of performance cement-base composite material volume；A diameter of 15～1000 μm of the fiber, fibre length be 1～
100mm。
Described ultrahigh-performance cement-based π ellbeams, the ultrahigh-performance cement-based π ellbeams are using high-strength muscle material (4) in abdomen
Plate (2) and top board (1) intersection and ball edge (3) carry out arrangement of reinforcement, web (2) and top board (1) the intersection ratio of reinforcement 0.02%～
Between 2%, ball edge (3) ratio of reinforcement applies prestressing force using pre-tensioning system between 1%～20% to high-strength muscle material (4)；The height
Strong muscle material (4) is high tensile reinforcement, the one kind in steel strand wires or fibre composite reinforcement；The fibre composite reinforcement is fine using organic synthesiss
Dimension, glass fibre, basalt fibre, the one or more combination of carbon fiber and resin are made.
Described ultrahigh-performance cement-based π ellbeams, the cross-sectional area of beam is 0.2～2m2, the total cross section ratio of reinforcement is 0.5%
～5%, dead load is 5～50kN/m, and rotary inertia is 2～20 × 1014mm4。
Described ultrahigh-performance cement-based π ellbeams, the stretching strain of span centre maximum is 2000～4000 μ during π ellbeam bend tests
ε, high-strength muscle material (4) maximum stress is 500～3000MPa during bend test, and web (2) maximum stretching strain during shearing test is
100～1000 μ ε.
Described ultrahigh-performance cement-based π ellbeams, deck-molding H1There is corresponding relation with span L, the corresponding relation is：When
H1Between 700～900mm, L is between 15～25m；Work as H1Between 900～1000mm, L is between 23～30m；Work as H1
Between 1000～1100mm, L is between 27.5～32m；Work as H1Between 1100～1300mm, L is between 30～41m.
Beneficial effect：
(1) ultrahigh-performance cement-based π ellbeams section it is little, from heavy and light, reasonable in design, high capacity, may be implemented in existing
Field Fast Installation；
(2) ultra high performance cementitious are designed based on closestpacking, and structure is extremely fine and close, possess higher resisting
The endurance qualities such as performance, anti-carbonation properties, chloride-penetration resistance, freeze thawing resistance circulation are oozed, stronger protection is formed to internal arrangement of reinforcement
Act on, so that the life-span of whole girder construction reaches more than 100 years；
(3) ultrahigh-performance cement-based π beam structures deadweight is much smaller than ordinary reinforced concrete structure, material cost and hangs
The construction costs such as dress are low, with certain economic advantages；
(4) ultra high performance cementitious possess the feature of high tenacity so that beam overall structure ductility is preferable, structure
Anti-seismic and disaster resistant performance be far above ordinary reinforced concrete structure；
(5) fatigue performance of ultrahigh-performance cement-based π ellbeams is superior, every mechanical property base under Fatigue Load
This is unattenuated, is particularly well-suited to vehicle flowrate larger middle-size and small-size highway, railroad bridge.
Description of the drawings
Fig. 1 is H1For 700～900mm when ultrahigh-performance cement-based π ellbeams sectional view
Fig. 2 is H1For 900～1000mm when ultrahigh-performance cement-based π ellbeams sectional view
Fig. 3 is H1For 1000～1100mm when ultrahigh-performance cement-based π ellbeams sectional view
Fig. 4 is H1For 1100～1300mm when ultrahigh-performance cement-based π ellbeams sectional view
In figure, 1 is top board；2 is web；3 is ball edge；4 is high-strength muscle material；B1It is top board (1) width；B2It is in ball edge (3)
Side spacing；B3It is ball edge (3) width；H1It is depth of beam；H2It is ball edge (3) height；T1It is top board (1) thickness；T2It is web (2)
Thickness；R1It is top board (1) and web (2) inner side chamfering radius；R2It is top board (1) and web (2) outside chamfer radius and web
And ball edge (3) chamfer radius (2)；R3It is ball edge (3) top edge chamfer radius.
Specific embodiment
With reference to specific embodiment, the present invention is expanded on further.It should be understood that these embodiments are merely to illustrate this
Bright rather than restriction the scope of the present invention.In addition, it is to be understood that after the content for having read instruction of the present invention, art technology
Personnel can make various changes or modifications to the present invention, and these equivalent form of values equally fall within the application appended claims and limited
Fixed scope.
Embodiment 1
Ultrahigh-performance cement-based π ellbeams, wherein：
B1=2500mm, B2=1250mm, B3=300mm, H1=890mm, H2=175mm, T1=100mm, T2=75mm,
R1=200mm, R2=125mm, R3=40mm, L=24400mm；
Ultra high performance cementitious, comprising Binder Materials, water and water reducer, cement volume accounts for 20%, the water
Mud is the PI cement that strength grade is 52.5, and the mineral admixture is silicon ash and flyash, accounts for 54%.
The proportioning fraction of cement, silicon ash and flyash enters line number by preferable accumulation curve and its particle diameter cumulative distribution curve
Value analytical calculation；
1) the preferable curve equation of piling up is：
Psd=A+ (100-A) (d/Dmax)π/2e；
Wherein, PsdFor the percentage ratio that granule passes through sieve aperture, A is empirical, and d is sieve diameter, DmaxFor the maximum of granule
Particle diameter；
The value of empirical A is required according to the design slump or design divergence of ultra high performance cementitious
Determined by formula：
Slump GB/T50080：140mm；The height h of slump bucket0For 300mm；
=2.333；
2) the particle diameter cumulative distribution curve of Binder Materials each component：
Respective cumulative distribution curve f is obtained to cement, silicon ash and flyash Jing testc(d)、fsf(d) and ffa(d)；Glue
The maximum particle diameter of cement is more than other two kinds of Binder Materials in gel material, so DmaxTake 110 μm of the maximum particle diameter of cement.
3) numerical analysis are as follows：
If it is X that cement accounts for the volume fraction of binder total amountc, silicon ash account for binder total amount volume fraction be XsfWith
It is X that flyash accounts for the volume fraction of binder total amountfa, and meet Xc∈[0.250,0.875]、(Xsf+Xfa)∈[0.125,
0.750]、Xc+Xsf+Xfa=1；
Set mixing after Binder Materials particle diameter cumulative distribution curve as：
P=Xcfc(d)+Xsffsf(d)+Xfaffa(d),
Volume fraction X to each componentc、XsfAnd XfaWith 0.001 as step-length, exhaustive computations P in respective span,
Comparison curvess P and Psd, 5 Along ents in maximum are taken on the vertical scale, calculate the abscissa grain corresponding to identical vertical coordinate
The standard deviation of footpath d, is computed comparing the X for obtaining standard deviation minimumc=0.270, Xsf=0.365, Xfa=0.519, respectively as
The proportioning fraction of cement, silicon ash and flyash；
The consumption of water is 0.121 with the mass ratio W/B of Binder Materials, and wherein W represents the consumption of water, and B represents Binder Materials
Quality.
Using polycarboxylate water-reducer, powder, water-reducing rate 30%, consumption is the 2.2% of Binder Materials.
The consumption of main materials of ultra high performance cementitious, percent by volume is as follows：
Each material usage of ultra high performance cementitious, mass ratio is as follows：
It is as follows that ultra high performance cementitious refer to that material mixes and stirs rear flowability properties：
Slump GB/T50080： 140mm；
Performance reaches following index after hardening：
Comprcssive strength, standard curing 28d： 188MPa.
Pour and build up cross section ultrahigh-performance cement-based π ellbeams as shown in Figure 1, wherein high-strength muscle material (4) is diameter
The steel strand wires of 12.7mm, tensile strength >=1860MPa, using pre-tensioning system prestressing force, web (2) and top board (1) intersection are applied
Each arrangement of reinforcement 2, each arrangement of reinforcement in both sides ball edge (3) 16 divides from top to bottom four layers of arrangement, and each layer arrangement of reinforcement number is 1,5,5,5；The horizontal stroke of beam
Sectional area is 0.56m2, the total cross section ratio of reinforcement is 0.64%, and dead load is 13.5kN/m, and rotary inertia is 6.2 × 1014mm4；
The stretching strain of span centre maximum is 2820 μ ε when beam deflection is tested, and high-strength muscle material (4) maximum stress is 1730MPa during bend test, is cut
The stretching strain of web (2) maximum is 455 μ ε when cutting test.
Embodiment 2
Ultrahigh-performance cement-based π ellbeams, wherein：
B1=2500mm, B2=1250mm, B3=300mm, H1=990mm, H2=230mm, T1=100mm, T2=75mm,
R1=200mm, R2=125mm, R3=40mm, L=29000mm；
Ultra high performance cementitious, comprising Binder Materials, water and water reducer, cement volume accounts for 49%, the water
Mud is the PI cement that strength grade is 62.5, and the mineral admixture is silicon ash, flyash and breeze, and volume accounts for 18%；Glue
The each group distribution ratio fraction of gel material obtains X by the calculation of embodiment 1c=0.731, Xsf=0.104, Xfa=0.094 He
Xbs=0.070.Water-cement ratio W/B=0.143, additive uses polycarboxylate water-reducer solution, volume to be Binder Materials quality
2.3%.
The consumption of main materials of ultra high performance cementitious, percent by volume is as follows：
Each material usage of ultra high performance cementitious, mass ratio is as follows：
It is as follows that ultra high performance cementitious refer to that material mixes and stirs rear flowability properties：
Divergence GB/T50080： 650mm；
Performance reaches following index after hardening：
Comprcssive strength, standard curing 28d： 195MPa.
Pour and build up cross section ultrahigh-performance cement-based π ellbeams as shown in Figure 2, wherein high-strength muscle material (4) be diameter 12mm,
The carbon fiber composite reinforcing of tensile strength >=1800MPa, using pre-tensioning system prestressing force is applied, and web (2) is each with top board (1) intersection
Arrangement of reinforcement 2, each arrangement of reinforcement in both sides ball edge (3) 19 divides from top to bottom four layers of arrangement, and each layer arrangement of reinforcement number is 4,5,5,5；Beam it is transversal
Area is 0.61m2, the total cross section ratio of reinforcement is 0.78%, and dead load is 14.5kN/m, and rotary inertia is 7.65 × 1014mm4；
The stretching strain of span centre maximum is 2554 μ ε when beam deflection is tested, and high-strength muscle material (4) maximum stress is 1700MPa during bend test, is cut
The stretching strain of web (2) maximum is 314 μ ε when cutting test.
Embodiment 3
Ultrahigh-performance cement-based π ellbeams, wherein：
B1=2650mm, B2=1300mm, B3=355mm, H1=1100mm, H2=230mm, T1=100mm, T2=
125mm、R1=200mm, R2=125mm, R3=40mm, L=32000mm；
Ultra high performance cementitious, comprising Binder Materials, aggregate, fiber, water and water reducer, cement volume is accounted for
20%, the cement is the PII cement that strength grade is 62.5, and the mineral admixture is silicon ash, flyash and breeze, is accounted for
19%.The each group distribution ratio fraction of Binder Materials obtains X by the calculation of embodiment 1c=0.512, Xsf=0.128, Xfa=
0.205 and Xbs=0.154.Coarse aggregate is the basalt continuous grading rubble of 5～10mm, and fine aggregate is the day of modulus of fineness 2.1
Right sand, be computed sand coarse aggregate ratio is 37%, aggregate is 0.921 with the volume ratio of Binder Materials.Fiber adopts 40 μm of diameter, length
The high density PE fiber of 12mm, volume volume is 0.5%.Water-cement ratio W/B=0.208, additive is molten using polycarboxylate water-reducer
Liquid, volume is the 1.0% of Binder Materials quality.
The consumption of main materials of ultra high performance cementitious, percent by volume is as follows：
Each material usage of ultra high performance cementitious, mass ratio is as follows：
It is as follows that ultra high performance cementitious refer to that material mixes and stirs rear flowability properties：
Slump GB/T50080： 215mm；
Performance reaches following index after hardening：
Comprcssive strength, standard curing 28d： 171MPa.
Pour and build up cross section ultrahigh-performance cement-based π ellbeams as shown in Figure 3, wherein high-strength muscle material (4) is diameter
The steel strand wires of 12.7mm, tensile strength >=1860MPa, using pre-tensioning system prestressing force, web (2) and top board (1) intersection are applied
Each arrangement of reinforcement 2, each arrangement of reinforcement in both sides ball edge (3) 20 divides from top to bottom four layers of arrangement, and each layer arrangement of reinforcement number is 3,5,6,6；The horizontal stroke of beam
Sectional area is 0.73m2, the total cross section ratio of reinforcement is 0.6%, and dead load is 17.8kN/m, and rotary inertia is 8.16 × 1014mm4；
The stretching strain of span centre maximum is 2505 μ ε when beam deflection is tested, and high-strength muscle material (4) maximum stress is 1710MPa during bend test, is cut
The stretching strain of web (2) maximum is 149 μ ε when cutting test.
Embodiment 4
Ultrahigh-performance cement-based π ellbeams, wherein：
B1=2650mm, B2=1300mm, B3=355mm, H1=1200mm, H2=280mm, T1=100mm, T2=
125mm、R1=200mm, R2=125mm, R3=40mm, L=41000mm；
Ultra high performance cementitious, comprising Binder Materials, aggregate, water reducer and water, cement volume accounts for 24.5%,
The cement is the PII cement that strength grade is 52.5, and the mineral admixture is silicon ash and breeze, accounts for volume
11.2%；The each group distribution ratio fraction of Binder Materials obtains X by the calculation of embodiment 1c=0.686, Xsf=0.134 and Xbs
=0.179；
Aggregate adopts the quartz sand and basaltic broken stone of gap grading, as follows：
1# graded sands：10～20 mesh
2# graded sands：20～40 mesh
1# rubbles：5～10mm
2# rubbles：10～15mm
The volume fraction of each aggregate component obtains X according to the calculation of embodiment 5s1=0.227, Xs2=0.186, Xr1=
0.352 and Xr2=0.235；
The ratio of aggregate and Binder Materials takes 1.275；Water-cement ratio is 0.148；Additive uses polycarboxylate water-reducer solution, mixes
Measure as the 1.9% of Binder Materials quality；
The consumption of main materials of ultra high performance cementitious, percent by volume is as follows：
Each material usage of ultra high performance cementitious, mass ratio is as follows：
It is as follows that ultra high performance cementitious refer to that material mixes and stirs rear flowability properties：
Slump GB/T50080： 185mm；
Performance reaches following index after hardening：
Comprcssive strength, standard curing 28d： 171MPa.
Pour and build up cross section ultrahigh-performance cement-based π ellbeams as shown in Figure 4, wherein high-strength muscle material (4) be diameter 12mm,
The carbon fiber composite reinforcing of tensile strength >=1800MPa, using pre-tensioning system prestressing force is applied, and web (2) is each with top board (1) intersection
Arrangement of reinforcement 2, each arrangement of reinforcement in both sides ball edge (3) 28 divides from top to bottom five layers of arrangement, and each layer arrangement of reinforcement number is 4,6,6,6,6；The horizontal stroke of beam
Sectional area is 0.78m2, the total cross section ratio of reinforcement is 0.87%, and dead load is 18.9kN/m, rotary inertia is 9.92 ×
1014mm4；The stretching strain of span centre maximum is 2685 μ ε when beam deflection is tested, and high-strength muscle material (4) maximum stress is during bend test
1730MPa, the stretching strain of web (2) maximum is 206 μ ε during shearing test.
Claims (7)
1. a kind of ultrahigh-performance cement-based π ellbeams poured by ultra high performance cementitious, it is characterised in that the π shapes
Beam is made up of top board (1), the web (2) being arranged symmetrically and ball edge (3), high-strength muscle material (4), and the depth of beam is set to into H1, top
Plate (1) width is set to B1, top board (1) thickness be set to T1, web (2) thickness be set to T2, ball edge (3) inner side spacing be set to B2, ball edge
(3) highly it is set to H2, ball edge (3) width be set to B3, top board (1) and web (2) inner side chamfering radius be set to R1, top board (1) and abdomen
Plate (2) outside chamfer radius and web (2) and ball edge (3) chamfer radius are set to R2, ball edge (3) top edge chamfer radius are set to
R3, beam span is when being set to L, meet：H1/B1=0.2～1；T1/H1=0.01～0.3；T2/B3=0.1～0.5；B2/B1=0.2
～0.8；B3/B2=0.1～0.5；T2/H1=0.02～0.2；R2/R1=0.3～0.8；R3/R2=0.1～0.5；1500mm≤
B1≤5000mm；500mm≤H1≤3000mm；L=10m～200m；
The ultrahigh-performance cement-based π ellbeams are poured by ultra high performance cementitious and formed；The very-high performance cement
Based composites include Binder Materials, additive and water, and the Binder Materials are cement and mineral admixture, and the cement is strong
Degree grade is 42.5 and PI, PII or PO code name cement of the above, and the mineral admixture is silicon ash, flyash and ore deposit
Powder；
Wherein, cement consumption accounts for the 20～70% of ultra high performance cementitious volume, and the mineral admixture accounts for superelevation
The 10～60% of performance cement-base composite material volume；
The proportioning fraction of the Binder Materials each component is by preferable accumulative point of particle diameter for piling up curve and Binder Materials each component
Cloth curve carries out numerical analysis；
1) the preferable curve equation of piling up is：
Psd=A+ (100-A) (d/Dmax)π/2e；
Wherein, PsdFor the percentage ratio that granule passes through sieve aperture, A is empirical, and d is sieve diameter, DmaxFor the maximum grain of granule
Footpath；
The value of empirical A requires to pass through according to the design slump or design divergence of ultra high performance cementitious
Formula determines：
As h≤220mm, A=5h/h0,
As h ＞ 220mm, A=5 (1-h)/h0,
L be divergence design load, h be slump design load, h0For the height 300mm of slump bucket；
2) the particle diameter cumulative distribution curve of Binder Materials each component：
Respective cumulative distribution curve f is obtained to the component cement needed for Binder Materials, silicon ash, flyash and breeze Jing testc
(d)、fsf(d)、ffa(d) and fbs(d)；
3) numerical analysis are as follows：
If it is X that cement accounts for the volume fraction of binder total amountc, silicon ash account for binder total amount volume fraction be Xsf, fine coal
It is X that ash accounts for the volume fraction of binder total amountfaThe volume fraction for accounting for binder total amount with breeze is Xbs, and meet Xc∈
[0.250,0.875]、(Xsf+Xfa+Xbs)∈[0.125,0.750]、Xc+Xsf+Xfa+Xbs=1；
Set mixing after Binder Materials particle diameter cumulative distribution curve as：
P=Xcfc(d)+Xsffsf(d)+Xfaffa(d)+Xbsfbs(d),
Volume fraction X to each componentc、Xsf、XfaAnd XbsIt is exhaustive in respective span with 0.001～0.01 as step-length
Calculate P, comparison curvess P and Psd, the standard deviation of the abscissa particle diameter d corresponding to identical vertical coordinate is calculated, take standard deviation minimum
Xc、Xsf、XfaAnd XbsIt is worth each group distribution ratio fraction as Binder Materials；
The consumption of water is 0.1～0.4 with the mass ratio W/B of Binder Materials, and wherein W represents the consumption of water, and B represents Binder Materials matter
Amount；
After ultra high performance cementitious by gained proportioning preparation is calculated are mixed and stirred, flowability properties are as follows：
Slump GB/T50080： ≥10mm；
Or divergence GB/T 50080： ≥450mm；
The value of divergence is just tested only when high fluidity is slump ＞ 220mm, and now concrete flowability is with divergence
It is defined；
Performance is as follows after hardened material：
Comprcssive strength, standard curing 28d： ≥170MPa.
2. ultrahigh-performance cement-based π ellbeams according to claim 1, it is characterised in that the vertical coordinate is according to maximum
100% grade point is chosen, and at least takes 5 values；Described W/B is 0.12 to 0.28；The cement meets GB《Common Portland water
Mud》GB175；The silicon ash meets《Mortar and concrete silicon ash》GB/T 27690；The flyash meets《For cement and
The flyash of concrete》GB/T 1596；The breeze meets《For the ground granulated blast furnace slag in cement and concrete》GB/
T18046；Water meets《Concrete water standard》JGJ 63；The additive be water reducer, defoamer, thickening agent, early strength agent,
Retarder or economization agent one or several combination, from the water reducer of water-reducing rate more than 25%, volume is described to water reducer
The 0.5%～5% of Binder Materials quality, defoamer volume is the 0.08%～2% of Binder Materials, and thickening agent volume is gelling material
The 0.005%～0.5% of material, retarder volume is cement material 0.005%～1.5%, and economization agent volume is Binder Materials
0.1%～5%.
3. ultrahigh-performance cement-based π ellbeams according to claim 2, it is characterised in that the water-reducing rate of the water reducer is
More than 30%, volume is the 0.8%～3% of the Binder Materials quality.
4. ultrahigh-performance cement-based π ellbeams according to claim 1, it is characterised in that the ultrahigh-performance cement-based is answered
Also add fiber in condensation material, the fiber is steel fibre or non-metallic fibers, and non-metallic fibers are vinal, poly- second
Alkene fiber, polypropylene fibre, polyacrylonitrile fibre, polyester fiber, nylon fiber, cellulose fibre, carbon fiber, glass fibre or
Basalt fibre, accounts for the 0.05%～5% of the ultra high performance cementitious volume；A diameter of the 15 of the fiber～
1000 μm, fibre length is 1～100mm.
5. ultrahigh-performance cement-based π ellbeams according to claim 1, it is characterised in that the ultrahigh-performance cement-based π shapes
Beam carries out arrangement of reinforcement using high-strength muscle material (4) in web (2) and top board (1) intersection and ball edge (3), and web (2) is handed over top board (1)
The ratio of reinforcement is between 0.02%～2% at boundary, ball edge (3) ratio of reinforcement between 1%～20%, using pre-tensioning system to high-strength muscle material
(4) prestressing force is applied；The high-strength muscle material (4) is high tensile reinforcement, the one kind in steel strand wires or fibre composite reinforcement；The fiber is answered
Close muscle to make using organic synthetic fibers, glass fibre, basalt fibre, the one or more combination of carbon fiber and resin.
6. ultrahigh-performance cement-based π ellbeams according to claim 1, it is characterised in that span centre is most during π ellbeam bend tests
Big stretching strain is 2000～4000 μ ε, and high-strength muscle material (4) maximum stress is 500～3000MPa during bend test, during shearing test
Web (2) maximum stretching strain is 100～1000 μ ε.
7. ultrahigh-performance cement-based π ellbeams according to claim 1, it is characterised in that deck-molding H1It is corresponding with span L presence
Relation, the corresponding relation is：Work as H1Between 700～900mm, L is between 15～25m；Work as H1Between 900～1000mm,
L is between 23～30m；Work as H1Between 1000～1100mm, L is between 27.5～32m；Work as H1Between 1100～1300mm,
L is between 30～41m.
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| CN110627429B (en) * | 2019-07-09 | 2022-05-06 | 武汉理工大学 | Pumice-based light self-compacting ultrahigh-performance concrete and preparation method thereof |
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