CN105386563A - Ultra-high performance cement-based H-shaped section bar - Google Patents
Ultra-high performance cement-based H-shaped section bar Download PDFInfo
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- CN105386563A CN105386563A CN201510715659.XA CN201510715659A CN105386563A CN 105386563 A CN105386563 A CN 105386563A CN 201510715659 A CN201510715659 A CN 201510715659A CN 105386563 A CN105386563 A CN 105386563A
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Abstract
The invention relates to an ultra-high performance cement-based H-shaped section bar which is formed by pouring an ultra-high performance cement-based composite material. The cement-based H-shaped section bar meet requirements as follows: H/B is equal to 0.8-3; t1/B is equal to 0.03-0.2; t2/H is equal to 0.03-0.2; R1/B is equal to 0.05-0.5; R2/t2 is equal to 0.1-0.5; and R3/R2 is smaller than or equal to 1. According to the ultra-high performance cement-based composite material, the grain composition of a multi-component cementitious material and the grain composition of an aggregate are optimized, and by means of chemical additives, on the premise that concrete has excellent fluidity, the compressive strength reaches more than 170 MPa under the 28 d standard. Through technologies of fibers, reinforcing bars and the like, the cement-based section bar obtains performance of a material component similar to section steel and is applied to structures such as beams, columns, piles and the like of a fabricated building, so that the building has portability and construction speed which are similar to the portability and the construction speed of a steel structure but corrosion resistance and fire resistance which are higher than the corrosion resistance and the fire resistance of a steel-structure section bar.
Description
Technical field
The present invention relates to a kind of assembling cement based H type section bar, in particular, relate to a kind of ultrahigh-performance cement-based H type section bar of being built by ultra high performance cementitious.
Background technology
Ordinary concrete due to the low fragility of intensity large, the structural element cross section of making is large, and construction convenience is poor, so not yet occur being similar to steel work section bar light and handy like this assembling easily section components.The appearance of ultra high performance cementitious makes assembling cement based section bar become possibility.Ultra high performance cementitious is by technology such as fiber reinforcement arrangements of reinforcement, ultrahigh-performance cement-based section bar is made to obtain the material members performance of similar shaped steel, be applied to the structures such as the beam of assembled architecture, post, stake, building is had be similar to portability and the construction speed of steel work, but have the corrosion-proof fire-resistant performance higher than steel work section bar.
Summary of the invention
The object of this invention is to provide a kind of ultrahigh-performance cement-based H type section bar of being built by ultra high performance cementitious, have web and the edge of a wing, the height dimension of this cement based H type section bar is set to H, the width dimensions on the above-mentioned edge of a wing is set to B, the thickness of web is set to t
1, the thickness on the edge of a wing is set to t
2, web and junction, edge of a wing circular arc are carried out chamfered, radius is set to R
1, by the edge of a wing near web right-angle side circular arc carry out chamfered, radius is set to R
2, the right-angle side circular arc of the upper and lower surface on the edge of a wing is carried out chamfered, radius is set to R
3time, meet: H/B=0.8 ~ 3; t
1/ B=0.03 ~ 0.2; t
2/ H=0.03 ~ 0.2; R
1/ B=0.05 ~ 0.5; R
2/ t
2=0.1 ~ 0.5; R
3/ R
2≤ 1.
Ultrahigh-performance cement-based H type section bar as above, is characterized in that cross section H can change along with profile length L, meets H=kL+H
0, become irregular section, wherein, k≤0.5, H
0for the elemental height of section bar.
Ultrahigh-performance cement-based H type section bar as above, it is characterized in that ultra high performance cementitious comprises cementitious material, Admixture and water, described cementitious material is cement and mineral admixture, to be strength grade be described cement 42.5 and above PI, PII or PO code name cement, the present invention is not precluded within particular cases, uses the cement of other types to be prepared high performance cement-based material according to method of the present invention.Described mineral admixture is two or three of silicon ash, flyash or breeze;
Wherein, cement consumption accounts for 20 ~ 70% of ultra high performance cementitious volume, and described mineral admixture accounts for 10 ~ 60% of ultra high performance cementitious volume;
The proportioning mark of each component of described cementitious material carries out numerical analysis by the desirable particle diameter cumulative distribution curve piling up curve and each component of cementitious material;
1) described ideal accumulation curve equation is:
P
sd＝A+(100-A)·(d/D
max)
π/2e；
Wherein, P
sdfor particle is by the percentage of sieve aperture, A is empirical, and d is sieve diameter, D
maxfor the maximum particle diameter of particle;
The value of empirical A requires to be determined by formula according to the design slump of ultra high performance cementitious or design divergence:
As h≤220mm, A=5h/h
0,
As h > 220mm, A=5 (l-h)/h
0,
L is divergence design load, and h is slump design load, h
0for the height 300mm of slump bucket;
2) the particle diameter cumulative distribution curve of each component of cementitious material:
To component cement required in cementitious material, silicon ash, flyash and breeze after tested obtain respective cumulative distribution curve f
c(d), f
sf(d), f
fa(d) and f
bs(d);
3) numerical analysis is as follows:
If the volume fraction that cement accounts for binder total amount is X
c, the silicon ash volume fraction that accounts for binder total amount is X
sf, the flyash volume fraction that accounts for binder total amount is X
fathe volume fraction accounting for binder total amount with breeze is X
bs, and meet X
c∈ [0.250,0.875], (X
sf+ X
fa+ X
bs) ∈ [0.125,0.750], X
c+ X
sf+ X
fa+ X
bs=1;
After setting mixing, the particle diameter cumulative distribution curve of cementitious material is:
P＝X
cf
c(d)+X
sff
sf(d)+X
faf
fa(d)+X
bsf
bs(d)，
To the volume fraction X of each component
c, X
sf, X
faand X
bswith 0.001 ~ 0.01 for step-length, exhaustive computations P in respective span, comparison curves P and P
sd, calculate the standard deviation of the abscissa particle diameter d corresponding to identical ordinate, get the X that standard deviation is minimum
c, X
sf, X
faand X
bsbe worth each component proportion mark as cementitious material; When use two kinds of mineral admixtures, then need to omit mass fraction corresponding to admixture and distribution curve that do not have to use;
The filler of corresponding non-gelling activity, as stone flour, because its particle diameter drops on the particle size interval of admixture substantially, when some occasion needs to use, can carry out calculating volume fraction according to the computational methods of above-mentioned mineral admixture;
The consumption of water and the mass ratio W/B of cementitious material are 0.1 ~ 0.4, and wherein W represents the consumption of water, and B represents cementitious material quality;
After mixing and stirring by the ultra high performance cementitious calculating the preparation of gained proportioning, flowability properties is as follows:
Slump GB/T50080: >=10mm;
Or divergence GB/T50080: >=450mm;
The value of divergence is only just tested when high fluidity and slump > 220mm, and now concrete flowability is as the criterion with divergence;
After material hardening, performance is as follows:
Compressive strength, standard curing 28d: >=170MPa.
When heat-treating maintenance, the compressive strength of material can be improved.Heat treatment method is: at 20 ± 2 DEG C, leave standstill 2 ~ 24 hours after solidifying, and then at 85 ± 5 DEG C, leaves standstill 24 ~ 48 hours.The compressive strength of heat-treating rear material reaches more than 220MPa.
Ultra high performance cementitious according to claim 3, is characterized in that, described ordinate is chosen according to maximum value 100% decile, at least gets 5 values.
As preferred technical scheme:
Ultra high performance cementitious as above, is characterized in that, described W/B is 0.12 to 0.28.
Ultra high performance cementitious as above, is characterized in that, described cement meets GB " general purpose portland cement " GB175; Described silicon ash meets " mortar and the reinforcement of concrete silicon ash " GB/T27690; Described flyash meets " for cement and concrete flyash " GB/T1596; Described breeze meets " GBFS in cement and concrete " GB/T18046; Water meets " the reinforcement of concrete water quality standard " JGJ63.
Ultra high performance cementitious as above, it is characterized in that, described super described Admixture is one or several the combination of water reducing agent, defoamer, thickener, early strength admixture, retarding agent or economization agent, the water reducing agent of water-reducing rate more than 25% selected by water reducing agent, volume is 0.5% ~ 5% of described cementitious material quality, defoamer volume is 0.08% ~ 2% of cementitious material, thickener volume is 0.005% ~ 0.5% of cementitious material, retarding agent volume is cement material 0.005% ~ 1.5%, and economization agent volume is 0.1% ~ 5% of cementitious material.
Ultra high performance cementitious as above, is characterized in that, the water-reducing rate of described water reducing agent is more than 30%, and volume is 0.8% ~ 3% of described cementitious material quality.
Ultra high performance cementitious as above, is characterized in that, also adds aggregate in described ultra high performance cementitious, is the mixture of fines or fines and coarse aggregate; The volume ratio of described aggregate and described cementitious material is 0.5 ~ 2.5.
Fines is natural sand or manufactured sand, and fineness modulus is 1.2 ~ 3.5, and bulk density is 1.1 ~ 2.1g/cm
3; Apparent density is 1.8 ~ 3.0g/cm
3.
Coarse aggregate is rubble or cobble, and particle diameter is 5 ~ 15mm; Bulk density is 1.1 ~ 2.1g/cm
3; Apparent density is 1.8 ~ 3.0g/cm
3;
For using the aggregate of continuous grading, during the mixture of preparation fines and coarse aggregate, calculate the sand coarse aggregate ratio value that coarse aggregate space just in time filled by fines, with the ratio of this sand coarse aggregate ratio value determination coarse aggregate and fines;
For the aggregate using gap grading, the ratio of aggregate carries out numerical analysis by the desirable cumulative distribution curve piling up curve and various aggregate;
1) described accumulation curve equation is:
P
sdA＝b+(100-b)·(d
A/D
Amax)
π/2e；
Wherein, P
sdAfor particles of aggregates is by the percentage of sieve aperture, b is aggregate empirical, d
afor aggregate sieve diameter, D
amaxfor the maximum particle diameter of particles of aggregates;
The value of empirical b requires to be determined by formula according to the slump of ultra high performance cementitious or divergence:
As h≤220mm, b=5h/h
0,
As h > 220mm, b=5 (l-h)/h
0,
L is divergence design load, and h is slump design load, h
0for the height 300mm of slump bucket;
2) the particle cumulative distribution curve of various aggregate:
Through screening test, respective cumulative distribution curve f is obtained to sand required in aggregate and stone
sm(d) and f
rn(d);
F
smd () is m# graded sand, m=1 ~ 5;
F
rnd () is n# grating stone, n=1 ~ 5; When not needing stone, then do not consider the cumulative distribution curve of stone;
3) numerical analysis is as follows:
If the volume fraction that m# graded sand accounts for aggregate total amount is X
sm, and the n# grating stone volume fraction that accounts for aggregate total amount be X
rn, and meet ∑ Xsm+ ∑ Xrn=1;
After setting mixing, the particle diameter cumulative distribution curve of aggregate is:
P
A＝∑Xsmfsm(d)+∑Xrnfrn(d)；
To the volume fraction X of each component
smand X
rnwith 0.001 ~ 0.05 for step-length, exhaustive computations P in respective span
a, comparison curves P
aand P
sdA, calculate the abscissa particle diameter d corresponding to identical ordinate
astandard deviation, get the X that standard deviation is minimum
smand X
rnbe worth each component proportion mark as aggregate.
Ultra high performance cementitious as above, described ordinate is chosen according to maximum value 100% decile, at least gets 5 values.
Ultra high performance cementitious as above, the fineness modulus of described fines is 2.4 ~ 2.8.
Ultra high performance cementitious as above, described rubble is basalt or granite.
Ultra high performance cementitious as above, also fiber is added in described ultra high performance cementitious, described fiber is steel fibre or non-metallic fibers, non-metallic fibers is vinal, polyethylene fibre, polypropylene fibre, polyacrylonitrile fibre, polyester fiber, nylon fiber, cellulose fibre, carbon fiber, glass fiber or basalt fibre, accounts for 0.05% ~ 5% of described ultra high performance cementitious volume; The diameter of described fiber is 15 ~ 1000 μm, and fibre length is 1 ~ 100mm.
Ultra high performance cementitious as above, also adopt plain bars, high tensile reinforcement, steel strand or fibre composite reinforcement to carry out arrangement of reinforcement in described ultra high performance cementitious, reinforcement ratio is between 0.2% ~ 20%.
Ultra high performance cementitious as above, carries out coating antiseptic process to reinforcing bar.Described coating comprises: one or more coatings combine of epoxy anticorrosive coating, polyurethane anticorrosion coating, chlorinated rubber corrosion-inhibiting coating, highly-chlorinated polyethylene corrosion-inhibiting coating, acrylate corrosion-inhibiting coating, organosilicon corrosion-inhibiting coating and fluorine carbon corrosion-inhibiting coating.
Ultra high performance cementitious as above, adopts stainless steel rebar.
Ultra high performance cementitious as above, fibre composite reinforcement adopts the one or more combination of organic synthetic fibers, glass fiber, basalt fibre and resin to make.
Ultra high performance cementitious as above, to arrangement of reinforcement Shi Hanzhang.
Ultra high performance cementitious H type section bar as above, the arrangement of reinforcement of section bar extends to the outer 50 ~ 1000mm of end face, can select when product moulding makes that embedding refuting connects muscle in end simultaneously, and refuting the buried depth connecing reinforcing bar is 50 ~ 1000mm.
Ultra high performance cementitious H type section bar as above, to section bar end face pre-embedded steel slab or 50 ~ 1000mm long and the contour wide H profile steel of ultra high performance cementitious H type section bar.
Ultra high performance cementitious H type section bar as above, pre-buried steel plate adopts with section bar same cross-sectional shape steel plate or adopts and the contour wide rectangular steel plates of ultra high performance cementitious H type section bar.
Ultra high performance cementitious H type section bar as above, adds ribs at the web place of ultra high performance cementitious H type section bar, the thickness t of rib
3meet t
3/ t
1=0.5 ~ 2.Spacing between ribs is 1 ~ 500 times of section bar height H.
Ultra high performance cementitious H type section bar as above, carries out surface coated treatment to Surface of profile by techniques such as brushing, roller coating or sprayings.Described coating comprises: one or more coatings combine of epoxy anticorrosive coating, polyurethane anticorrosion coating, chlorinated rubber corrosion-inhibiting coating, highly-chlorinated polyethylene corrosion-inhibiting coating, acrylate corrosion-inhibiting coating, organosilicon corrosion-inhibiting coating and fluorine carbon corrosion-inhibiting coating.
Beneficial effect:
(1) obtain the material members performance of similar shaped steel, be applied to the structures such as the beam of assembled architecture, post, stake, building is had be similar to portability and the construction speed of steel work, but have the corrosion-proof fire-resistant performance higher than steel work section bar;
(2) grain composition by optimizing gelling material particles grating and aggregate meets the requirement of construction mobility under reaching low water binder ratio;
(3) due to closestpacking design, the performance such as anti-permeability performance, anti-carbonation properties, chloride-penetration resistance, freeze thawing resistance circulation is better than ordinary concrete;
Accompanying drawing explanation
Fig. 1 is the H type section bar sectional view of H/B=2
Fig. 2 is the H type section bar sectional view of H/B=1
Wherein 1 is ultra high performance cementitious; 2 is arrangements of reinforcement.
Detailed description of the invention
Below in conjunction with detailed description of the invention, set forth the present invention further.Should be understood that these embodiments are only not used in for illustration of the present invention to limit the scope of the invention.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the present invention's instruction.
Embodiment 1
Ultrahigh-performance cement-based H type section bar, wherein:
H＝400mm、B＝200mm、t
1＝30mm、t
2＝30mm、R
1＝20mm、R
2＝3mm、R
3＝0mm；
Ultra high performance cementitious, comprises cementitious material, water and water reducing agent, and cement volume accounts for 20%, described cement to be strength grade be 52.5 PI cement, described mineral admixture is silicon ash and flyash, accounts for 54%.
The proportioning mark of cement, silicon ash and flyash carries out numerical analysis by desirable accumulation curve and its particle diameter cumulative distribution curve;
1) described ideal accumulation curve equation is:
P
sd＝A+(100-A)·(d/D
max)
π/2e；
Wherein, P
sdfor particle is by the percentage of sieve aperture, A is empirical, and d is sieve diameter, D
maxfor the maximum particle diameter of particle;
The value of empirical A requires to be determined by formula according to the design slump of ultra high performance cementitious or design divergence:
Slump GB/T50080:140mm; The height h of slump bucket
0for 300mm;
A＝5·h/h
0＝2.333；
2) the particle diameter cumulative distribution curve of each component of cementitious material:
To cement, silicon ash and flyash after tested obtain respective cumulative distribution curve f
c(d), f
sf(d) and f
fa(d); In cementitious material, the maximum particle diameter of cement is greater than other two kinds of cementitious material, so D
maxget the maximum particle diameter 110 μm of cement.
3) numerical analysis is as follows:
If the volume fraction that cement accounts for binder total amount is X
c, the silicon ash volume fraction that accounts for binder total amount is X
sfthe volume fraction accounting for binder total amount with flyash is X
fa, and meet X
c∈ [0.250,0.875], (X
sf+ X
fa) ∈ [0.125,0.750], X
c+ X
sf+ X
fa=1;
After setting mixing, the particle diameter cumulative distribution curve of cementitious material is:
P＝X
cf
c(d)+X
sff
sf(d)+X
faf
fa(d)，
To the volume fraction X of each component
c, X
sfand X
fawith 0.001 for step-length, exhaustive computations P in respective span, comparison curves P and P
sd, get 5 Along ents in maximum value on the vertical scale, calculate the standard deviation of the abscissa particle diameter d corresponding to identical ordinate, compare as calculated and obtain the minimum X of standard deviation
c=0.270, X
sf=0.365, X
fa=0.519, respectively as the proportioning mark of cement, silicon ash and flyash;
The consumption of water and the mass ratio W/B of cementitious material are 0.121, and wherein W represents the consumption of water, and B represents cementitious material quality.
Use polycarboxylate water-reducer, pulvis, water-reducing rate 30%, consumption is 2.2% of cementitious material.
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 refers to that material mixes and stirs rear flowability properties:
Slump GB/T50080:140mm;
After sclerosis, performance reaches following index:
Compressive strength, standard curing 28d:188MPa.
Water and build up cross section H type section bar as shown in Figure 1, matrix (1) is ultra high performance cementitious, and arrangement of reinforcement (2) is plain bars, and reinforcement ratio is 3.14%.The arrangement of reinforcement of section bar extends to the outer 200mm of end face.The epoxy anticorrosive coating thick to H type Surface of profile spraying 0.5mm.
Embodiment 2
Ultrahigh-performance cement-based H type section bar, wherein:
H＝400mm、B＝400mm、t
1＝50mm、t
2＝50mm、R
1＝25mm、R
2＝5mm、R
3＝5mm；
Ultra high performance cementitious, comprises cementitious material, water and water reducing agent, and cement volume accounts for 49%, described cement to be strength grade be 62.5 PI cement, described mineral admixture is silicon ash, flyash and breeze, and volume accounts for 18%; Each component proportion mark of cementitious material, by the account form of embodiment 1, obtains X
c=0.731, X
sf=0.104, X
fa=0.094 and X
bs=0.070.Water-cement ratio W/B=0.143, Admixture uses polycarboxylate water-reducer solution, and volume is 2.3% of cementitious material 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 refers to that material mixes and stirs rear flowability properties:
Divergence GB/T50080:650mm;
After sclerosis, performance reaches following index:
Compressive strength, standard curing 28d:195MPa.
Water and build up cross section H type section bar as shown in Figure 2, matrix (1) is ultra high performance cementitious, and arrangement of reinforcement (2) is high tensile reinforcement arrangement of reinforcement, and reinforcement ratio is 6.0%, adopts pre-tensioning system Shi Hanzhang.The H type shaped steel of the pre-buried connection of section material section and the prismatic 50mm length of H type section bar.To H type section bar and the thick polyurethane anticorrosion coating of joint shaped steel surface spraying 0.5mm.
Embodiment 3
Ultrahigh-performance cement-based H type section bar, wherein:
H＝400mm、B＝200mm、t
1＝30mm、t
2＝30mm、R
1＝20mm、R
2＝3mm、R
3＝0mm；
Ultra high performance cementitious, comprise cementitious material, fines, steel fibre, water and water reducing agent, cement volume accounts for 26.5%, described cement to be strength grade be 52.5 PII cement, described mineral admixture is silicon ash, flyash and breeze, accounts for 15.8%.Each component proportion mark of cementitious material, by the account form of embodiment 1, obtains X
c=0.626, X
sf=0.161, X
fa=0.102 and X
bs=0.111.Fines is the natural sand of fineness modulus 1.4, and volume is 0.811 of cementitious material volume.Steel fibre adopts the copper plated steel fiber of diameter 0.2mm, length 13mm, and volume volume is 1.5%.Water-cement ratio W/B=0.162, Admixture uses polycarboxylate water-reducer solution, and volume is 2.3% of cementitious material 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 refers to that material mixes and stirs rear flowability properties:
Divergence GB/T50080:635mm;
After sclerosis, performance reaches following index:
Compressive strength, standard curing 28d:173MPa.
Water and build up cross section H type section bar as shown in Figure 1, matrix (1) is ultra high performance cementitious, and arrangement of reinforcement (2) is high tensile reinforcement arrangement of reinforcement, and reinforcement ratio is 3.14%.The arrangement of reinforcement of section bar extends to the outer 300mm of end face.The epoxy anticorrosive coating thick to H type Surface of profile spraying 0.5mm.
Embodiment 4
Ultrahigh-performance cement-based H type section bar, wherein:
H＝400mm、B＝400mm、t
1＝50mm、t
2＝50mm、R
1＝25mm、R
2＝5mm、R
3＝5mm；
Ultra high performance cementitious, comprises cementitious material, aggregate, fiber, water and water reducing agent, and cement volume accounts for 20%, described cement to be strength grade be 62.5 PII cement, described mineral admixture is silicon ash, flyash and breeze, accounts for 19%.Each component proportion mark of cementitious material, by the account form of embodiment 1, obtains X
c=0.512, X
sf=0.128, X
fa=0.205 and X
bs=0.154.Coarse aggregate is the basalt continuous grading rubble of 5 ~ 10mm, and fines is the natural sand of fineness modulus 2.1, and obtaining sand coarse aggregate ratio is as calculated 37%, and the volume ratio of aggregate and cementitious material is 0.921.Fiber adopts the high density PE fiber of diameter 40 μm, length 12mm, and volume volume is 0.5%.Water-cement ratio W/B=0.208, Admixture uses polycarboxylate water-reducer solution, and volume is 1.0% of cementitious material 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 refers to that material mixes and stirs rear flowability properties:
Slump GB/T50080:215mm;
After sclerosis, performance reaches following index:
Compressive strength, standard curing 28d:171MPa.
Water and build up cross section H type section bar as shown in Figure 2, matrix (1) is ultra high performance cementitious, and arrangement of reinforcement (2) is plain bars arrangement of reinforcement, and reinforcement ratio is 6.0%.The pre-buried connection of section material section and the thick rectangular steel plates of the wide high 20mm of H type section bar.To H type section bar and the thick polyurethane anticorrosion coating of joint shaped steel surface spraying 0.5mm.
Embodiment 5
Ultrahigh-performance cement-based H type section bar, wherein:
H＝400mm、B＝200mm、t
1＝30mm、t
2＝30mm、R
1＝20mm、R
2＝3mm、R
3＝0mm；
Ultra high performance cementitious, comprises cementitious material, fines, water reducing agent and water, and cement volume accounts for 32%, described cement to be strength grade be 52.5 PO cement, described mineral admixture is silicon ash and breeze, accounts for 15% of volume; Each component proportion mark of cementitious material, by the account form of embodiment 1, obtains X
c=0.681, X
sf=0.153 and X
bs=0.166;
Fines adopts the grating quartz sand of different meshes:
1#:20-40 order;
2#:40-80 order;
3#:80-120 order;
The ratio of aggregate carries out numerical analysis by the desirable cumulative distribution curve piling up curve and various aggregate;
1) described accumulation curve equation is:
P
sdA＝b+(100-b)·(d
A/D
Amax)
π/2e；
Wherein, P
sdAfor particles of aggregates is by the percentage of sieve aperture, b is aggregate empirical, d
afor aggregate sieve diameter, D
amaxget the maximum particle diameter 1.18mm of 1# graded sand;
The value of empirical b requires to be determined by formula according to the slump of ultra high performance cementitious or divergence:
Slump GB/T50080:195mm; The height h of slump bucket
0for 300mm;
b＝5·h/h
0＝3.25；
2) the particle cumulative distribution curve of various aggregate:
Above-mentioned 3 kinds of sand obtain respective cumulative distribution curve through screening test and are followed successively by f
s1(d), f
s2(d) and f
s3(d).
3) numerical analysis is as follows:
If the volume fraction that the graded sand of 1#, 2# and 3# accounts for aggregate total amount is X
s1, X
s2and X
s3, and meet X
s1+ X
s2+ X
s3=1;
After setting mixing, the particle diameter cumulative distribution curve of aggregate is:
P
A＝X
s1f
s1(d)+X
s2f
s2(d)+X
s3f
s3(d)；
To the volume fraction X of each component
s1, X
s2and X
s3with 0.002 for step-length, exhaustive computations P in respective span
a, comparison curves P
aand P
sdA, calculate the abscissa particle diameter d corresponding to identical ordinate
astandard deviation, compare as calculated and obtain the minimum X of standard deviation
s1=0.458, X
s2=0.312, X
s3=0.230, respectively as the proportioning mark of the graded sand of 1#, 2# and 3#;
The ratio of aggregate and cementitious material gets 0.564; Water-cement ratio is 0.167; Admixture uses polycarboxylate water-reducer solution, and volume is 1.4% of cementitious material quality; Fiber adopts vinal, and diameter is 40 μm, and length is 12mm, and volume volume is 0.1%;
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 refers to that material mixes and stirs rear flowability properties:
Slump GB/T50080:195mm;
After sclerosis, performance reaches following index:
Compressive strength, standard curing 28d:175MPa.
Watering and building up cross section H type section bar matrix (1) is as shown in Figure 1 ultra high performance cementitious, and arrangement of reinforcement (2) is high tensile reinforcement arrangement of reinforcement, and reinforcement ratio is 3.14%.The pre-buried connection of section material section and the thick rectangular steel plates of the wide high 15mm of H type section bar.The acrylate corrosion-inhibiting coating thick to H type Surface of profile spraying 0.5mm.
Embodiment 6
Ultrahigh-performance cement-based H type section bar, adds ribs at the web place of section bar, wherein:
H=400mm, B=400mm, t
1=50mm, t
2=50mm, R
1=25mm, R
2=5mm, R
3=5mm, t
3=50mm, ribs spacing=1000mm;
Ultra high performance cementitious, comprises cementitious material, aggregate, water reducing agent and water, and cement volume accounts for 24.5%, described cement to be strength grade be 52.5 PII cement, described mineral admixture is silicon ash and breeze, accounts for 11.2% of volume; Each component proportion mark of cementitious material, by the account form of embodiment 1, obtains X
c=0.686, X
sf=0.134 and X
bs=0.179;
Aggregate adopts quartz sand and the basaltic broken stone of gap grading, as follows:
1# graded sand: 10 ~ 20 orders
2# graded sand: 20 ~ 40 orders
1# rubble: 5 ~ 10mm
2# rubble: 10 ~ 15mm
The volume fraction of each aggregate component, according to the account form of embodiment 5, obtains X
s1=0.227, X
s2=0.186, X
r1=0.352 and X
r2=0.235;
The ratio of aggregate and cementitious material gets 1.275; Water-cement ratio is 0.148; Admixture uses polycarboxylate water-reducer solution, and volume is 1.9% of cementitious material 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 refers to that material mixes and stirs rear flowability properties:
Slump GB/T50080:185mm;
After sclerosis, performance reaches following index:
Compressive strength, standard curing 28d:171MPa.
Water and build up cross section H type section bar as shown in Figure 2, matrix (1) is ultra high performance cementitious, and arrangement of reinforcement (2) is high tensile reinforcement arrangement of reinforcement, and reinforcement ratio is 6.0%.The arrangement of reinforcement of section bar extends to the outer 300mm of end face.To H type section bar and the thick fluorine carbon corrosion-inhibiting coating of joint shaped steel surface spraying 0.5mm.
Claims (10)
1. a ultrahigh-performance cement-based H type section bar, has web and the edge of a wing, it is characterized in that, the height dimension of this cement based H type section bar is set to H, the width dimensions on the above-mentioned edge of a wing is set to B, the thickness of web is set to t
1, the thickness on the edge of a wing is set to t
2, web and junction, edge of a wing circular arc are carried out chamfered, radius is set to R
1, by the edge of a wing near web right-angle side circular arc carry out chamfered, radius is set to R
2, the right-angle side circular arc of the upper and lower surface on the edge of a wing is carried out chamfered, radius is set to R
3time, meet: H/B=0.8 ~ 3; t
1/ B=0.03 ~ 0.2; t
2/ H=0.03 ~ 0.2; R
1/ B=0.05 ~ 0.5; R
2/ t
2=0.1 ~ 0.5; R
3/ R
2≤ 1;
Described ultrahigh-performance cement-based H type section bar is built by ultra high performance cementitious and is formed; Described ultra high performance cementitious comprises cementitious material, Admixture and water, described cementitious material is cement and mineral admixture, to be strength grade be described cement 42.5 and above PI, PII or PO code name cement, and described mineral admixture is two or three of silicon ash, flyash or breeze;
Wherein, cement consumption accounts for 20 ~ 70% of ultra high performance cementitious volume, and described mineral admixture accounts for 10 ~ 60% of ultra high performance cementitious volume;
The proportioning mark of each component of described cementitious material carries out numerical analysis by the desirable particle diameter cumulative distribution curve piling up curve and each component of cementitious material;
1) described ideal accumulation curve equation is:
P
sd＝A+(100-A)·(d/D
max)
π/2e；
Wherein, P
sdfor particle is by the percentage of sieve aperture, A is empirical, and d is sieve diameter, D
maxfor the maximum particle diameter of particle;
The value of empirical A requires to be determined by formula according to the design slump of ultra high performance cementitious or design divergence:
As h≤220mm, A=5h/h
0,
As h > 220mm, A=5 (l-h)/h
0,
L is divergence design load, and h is slump design load, h
0for the height 300mm of slump bucket;
2) the particle diameter cumulative distribution curve of each component of cementitious material:
To component cement required in cementitious material, silicon ash, flyash and breeze after tested obtain respective cumulative distribution curve f
c(d), f
sf(d), f
fa(d) and f
bs(d);
3) numerical analysis is as follows:
If the volume fraction that cement accounts for binder total amount is X
c, the silicon ash volume fraction that accounts for binder total amount is X
sf, the flyash volume fraction that accounts for binder total amount is X
fathe volume fraction accounting for binder total amount with breeze is X
bs, and meet X
c∈ [0.250,0.875], (X
sf+ X
fa+ X
bs) ∈ [0.125,0.750], X
c+ X
sf+ X
fa+ X
bs=1;
After setting mixing, the particle diameter cumulative distribution curve of cementitious material is:
P＝X
cf
c(d)+X
sff
sf(d)+X
faf
fa(d)+X
bsf
bs(d)，
To the volume fraction X of each component
c, X
sf, X
faand X
bswith 0.001 ~ 0.01 for step-length, exhaustive computations P in respective span, comparison curves P and P
sd, calculate the standard deviation of the abscissa particle diameter d corresponding to identical ordinate, get the X that standard deviation is minimum
c, X
sf, X
faand X
bsbe worth each component proportion mark as cementitious material;
The consumption of water and the mass ratio W/B of cementitious material are 0.1 ~ 0.4, and wherein W represents the consumption of water, and B represents cementitious material quality;
After mixing and stirring by the ultra high performance cementitious calculating the preparation of gained proportioning, flowability properties is as follows:
Slump GB/T50080: >=10mm;
Or divergence GB/T50080: >=450mm;
The value of divergence is only just tested when high fluidity and slump > 220mm, and now concrete flowability is as the criterion with divergence;
After material hardening, performance is as follows:
Compressive strength, standard curing 28d: >=170MPa.
2. ultra high performance cementitious according to claim 1, is characterized in that, described ordinate is chosen according to maximum value 100% decile, at least gets 5 values; Described W/B is 0.12 to 0.28; Described cement meets GB " general purpose portland cement " GB175; Described silicon ash meets " mortar and the reinforcement of concrete silicon ash " GB/T27690; Described flyash meets " for cement and concrete flyash " GB/T1596; Described breeze meets " GBFS in cement and concrete " GB/T18046; Water meets " the reinforcement of concrete water quality standard " JGJ63; Described super described Admixture is one or several the combination of water reducing agent, defoamer, thickener, early strength admixture, retarding agent or economization agent, the water reducing agent of water-reducing rate more than 25% selected by water reducing agent, volume is 0.5% ~ 5% of described cementitious material quality, defoamer volume is 0.08% ~ 2% of cementitious material, thickener volume is 0.005% ~ 0.5% of cementitious material, retarding agent volume is cement material 0.005% ~ 1.5%, and economization agent volume is 0.1% ~ 5% of cementitious material.
3. ultra high performance cementitious according to claim 2, is characterized in that, the water-reducing rate of described water reducing agent is more than 30%, and volume is 0.8% ~ 3% of described cementitious material quality.
4. ultra high performance cementitious according to claim 1, is characterized in that, also adds aggregate in described ultra high performance cementitious, is the mixture of fines or fines and coarse aggregate; The volume ratio of described aggregate and described cementitious material is 0.5 ~ 2.5;
Fines is natural sand or manufactured sand, and fineness modulus is 1.2 ~ 3.5, and bulk density is 1.1 ~ 2.1g/cm
3; Apparent density is 1.8 ~ 3.0g/cm
3;
Coarse aggregate is rubble or cobble, and particle diameter is 5 ~ 15mm; Bulk density is 1.1 ~ 2.1g/cm
3; Apparent density is 1.8 ~ 3.0g/cm
3;
For using the aggregate of continuous grading, during the mixture of preparation fines and coarse aggregate, calculate the sand coarse aggregate ratio value that coarse aggregate space just in time filled by fines, with the ratio of this sand coarse aggregate ratio value determination coarse aggregate and fines;
For the aggregate using gap grading, the ratio of aggregate carries out numerical analysis by the desirable cumulative distribution curve piling up curve and various aggregate;
1) described accumulation curve equation is:
P
sdA＝b+(100-b)·(d
A/D
Amax)
π/2e；
Wherein, P
sdAfor particles of aggregates is by the percentage of sieve aperture, b is aggregate empirical, d
afor aggregate sieve diameter, D
amaxfor the maximum particle diameter of particles of aggregates;
The value of empirical b requires to be determined by formula according to the slump of ultra high performance cementitious or divergence:
As h≤220mm, b=5h/h
0,
As h > 220mm, b=5 (l-h)/h
0,
L is divergence design load, and h is slump design load, h
0for the height 300mm of slump bucket;
2) the particle cumulative distribution curve of various aggregate:
Through screening test, respective cumulative distribution curve f is obtained to sand required in aggregate and stone
sm(d) and f
rn(d);
F
smd () is m# graded sand, m=1 ~ 5;
F
rnd () is n# grating stone, n=1 ~ 5; When not needing stone, then do not consider the cumulative distribution curve of stone;
3) numerical analysis is as follows:
If the volume fraction that m# graded sand accounts for aggregate total amount is X
sm, and the n# grating stone volume fraction that accounts for aggregate total amount be X
rn, and meet ∑ Xsm+ ∑ Xrn=1;
After setting mixing, the particle diameter cumulative distribution curve of aggregate is:
P
A＝∑Xsmfsm(d)+∑Xrnfrn(d)；
To the volume fraction X of each component
smand X
rnwith 0.001 ~ 0.05 for step-length, exhaustive computations P in respective span
a, comparison curves P
aand P
sdA, calculate the abscissa particle diameter d corresponding to identical ordinate
astandard deviation, get the X that standard deviation is minimum
smand X
rnbe worth each component proportion mark as aggregate.
5. ultra high performance cementitious according to claim 4, is characterized in that, described ordinate is chosen according to maximum value 100% decile, at least gets 5 values; The fineness modulus of described fines is 2.4 ~ 2.8; Described rubble is basalt or granite.
6. ultra high performance cementitious according to claim 1, it is characterized in that, also fiber is added in described ultra high performance cementitious, described fiber is steel fibre or non-metallic fibers, non-metallic fibers is vinal, polyethylene fibre, polypropylene fibre, polyacrylonitrile fibre, polyester fiber, nylon fiber, cellulose fibre, carbon fiber, glass fiber or basalt fibre, accounts for 0.05% ~ 5% of described ultra high performance cementitious volume; The diameter of described fiber is 15 ~ 1000 μm, and fibre length is 1 ~ 100mm.
7. ultra high performance cementitious according to claim 1, it is characterized in that, also adopt plain bars, high tensile reinforcement, steel strand or fibre composite reinforcement to carry out arrangement of reinforcement in described ultra high performance cementitious, reinforcement ratio is between 0.2% ~ 20%; When building, to arrangement of reinforcement Shi Hanzhang; Described fibre composite reinforcement adopts the one or more combination of organic synthetic fibers, glass fiber, basalt fibre and resin to make; Coating antiseptic process or arrangement of reinforcement material employing stainless steel are carried out to reinforcing bar; Describedly carry out coating antiseptic process to reinforcing bar and refer to and carry out surface coated treatment to Surface of profile by brushing, roller coating or spraying coating process, described coating comprises: one or more coatings combine of epoxy anticorrosive coating, polyurethane anticorrosion coating, chlorinated rubber corrosion-inhibiting coating, highly-chlorinated polyethylene corrosion-inhibiting coating, acrylate corrosion-inhibiting coating, organosilicon corrosion-inhibiting coating and fluorine carbon corrosion-inhibiting coating.
8. ultra high performance cementitious H type section bar according to claim 1, it is characterized in that, the arrangement of reinforcement of section bar extends to the outer 50 ~ 1000mm of end face, can select when product moulding makes that embedding refuting connects muscle in end simultaneously, and refuting the buried depth connecing reinforcing bar is 50 ~ 1000mm.
9. ultra high performance cementitious H type section bar according to claim 1, is characterized in that, to section bar end face pre-embedded steel slab or 50 ~ 1000mm long and the contour wide H profile steel of ultra high performance cementitious H type section bar; Pre-buried steel plate adopts with section bar same cross-sectional shape steel plate or adopts and the contour wide rectangular steel plates of ultra high performance cementitious H type section bar.
10. ultra high performance cementitious H type section bar according to claim 1, is characterized in that, adds ribs, the thickness t of rib at the web place of ultra high performance cementitious H type section bar
3meet t
3/ t
1=0.5 ~ 2; Spacing between ribs=(1 ~ 500) H; Cross section H can change along with profile length L, meets H=kL+H
0, become irregular section, wherein, k≤0.5, H
0for the elemental height of section bar.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108005257A (en) * | 2017-12-12 | 2018-05-08 | 蒋燕鑫 | A kind of construction techniques |
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