CN103938794A - Ultra-high performance cement based groove type profile - Google Patents

Ultra-high performance cement based groove type profile Download PDF

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Publication number
CN103938794A
CN103938794A CN201410100801.5A CN201410100801A CN103938794A CN 103938794 A CN103938794 A CN 103938794A CN 201410100801 A CN201410100801 A CN 201410100801A CN 103938794 A CN103938794 A CN 103938794A
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China
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cementitious
ultra
performance
cement
aggregate
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Inventor
施慧聪
刘国平
赵正
王俊颜
姚欣
刘健
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Shanghai Royang Innovative Material Technologies Co Ltd
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Shanghai Royang Innovative Material Technologies Co Ltd
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Priority to CN201410100801.5A priority Critical patent/CN103938794A/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Abstract

The invention relates to an ultra-high performance cement based groove type profile cast from an ultra-high performance cement based composite material. The cement based groove type profile meets the conditions of: H/B=0.8-3; D/B=0.1-0.5; t/H=0.05-0.5; R/B=0.05-0.5; and R1/t=0.1-0.5. By optimizing the grain gradation of a multi-element cementing material and the grain gradation of an aggregate, and using a water reducing agent and other chemical additives, under the premise that concrete has good flowability, the ultra-high performance cement based composite material involved in the invention can reach compressive strength of over 170MPa under 28d standard curing. By means of fiber reinforced reinforcement and other technologies, the ultra-high performance cement based composite material enables the ultra-high performance cement based profile to acquire material component properties similar to those of section steel. By applying the profile provided by the invention to beams, columns, piles and other structures of prefabricated buildings, the buildings can have a construction speed similar to that of a steel structure, but can have higher corrosion resistance and fire resistance than steel structure profiles.

Description

Ultrahigh-performance cement-based grooved section
Technical field
The present invention relates to a kind of ultrahigh-performance cement-based grooved section, is a kind of assembling cement based grooved section, in particular, relates to a kind of ultrahigh-performance cement-based grooved section of being built by ultra high performance cementitious.
Background technology
Ordinary concrete is because the low fragility of intensity is large, and the structural element cross section of making is large, and construction convenience is poor, so not yet there is being similar to the light and handy like this assembling easily of steel work section bar 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, make ultrahigh-performance cement-based section bar obtain the material members performance of similar shaped steel, be applied to the structure such as beam, post, stake of assembled architecture, building is had and be similar to 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 grooved section of being built by ultra high performance cementitious, the height dimension of this cement based grooved section is made as H, the wide size of leg and is made as B, the thick size of waist and is made as D, average leg thickness and is made as that t, waist end arc radius are made as R, leg end arc radius is made as R 1time, meet: H/B=0.8~3; D/B=0.1~0.5; T/H=0.05~0.5; R/B=0.05~0.5; R 1/ t=0.1~0.5.
Ultrahigh-performance cement-based grooved section 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 0elemental height for section bar.
Ultrahigh-performance cement-based grooved section 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, described cement is that strength grade is 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 particle diameter cumulative distribution curve that the proportioning mark of described each component of cementitious material is piled up curve and each component of cementitious material by ideal carries out numerical analysis;
1) the described desirable curve equation of piling up is:
P sd100·/max/;
Wherein, P sdfor particle is by the percentage of sieve aperture, A is empirical, and d is sieve diameter, D maxmaximum particle diameter for particle;
The value of empirical A requires to determine by formula according to the design slump of ultra high performance cementitious or design divergence:
When h≤220mm, A5h/h,
When h > 220mm, A5lh/h,
L is divergence design load, and h is slump design load, h 0height 300mm for 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 cumulative distribution curve f separately c(d), f sf(d), f faand f (d) bs(d);
3) numerical analysis is as follows:
If it is X that cement accounts for the volume fraction of binder total amount 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 that accounts 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;
Setting the particle diameter cumulative distribution curve of cementitious material after mixing is:
P=X cf c(d)+X sff sf(d)+X faf fa(d)+X bs?f bs(d),
Volume fraction X to each component c, X sf, X faand X bstake 0.001~0.01 as step-length, exhaustive computations P in span separately, comparison curves P and P sd, calculate the standard deviation of the corresponding abscissa particle diameter of identical ordinate d, get the X of standard deviation minimum c, X sf, X faand X bsvalue is as each component proportion mark of cementitious material; When using two kinds of mineral admixtures, need to omit corresponding mass fraction and the distribution curve of admixture that there is no 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 need to be used, can carry out volume calculated mark according to the computational methods of above-mentioned mineral admixture;
The mass ratio W/B of the consumption of water and cementitious material is 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 that calculates the preparation of gained proportioning, flowability properties is as follows:
Slump GB/T50080: >=10mm;
Or divergence GB/T50080: >=450mm;
Only when high fluidity is slump > 220mm, just test divergence, now concrete flowability is as the criterion with divergence;
After material sclerosis, performance is as follows:
Compressive strength, standard curing 28d: >=170MPa.
While heat-treating maintenance, can improve the compressive strength of material.Heat treatment method is: after solidifying at 20 ± 2 ℃ standing 2~24 hours, and then at 85 ± 5 ℃ standing 24~48 hours.Heat-treat the compressive strength >=220MPa of rear material.
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 < < for the GBFS > > GB/T18046 of cement and concrete; 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, water reducing agent is selected more than 25% water reducing agent of water-reducing rate, 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 cementitious material 0.1%~5%.
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 the aggregate that uses continuous grading, during the mixture of preparation fines and coarse aggregate, calculate the sand coarse aggregate ratio value that fines is just in time filled coarse aggregate space, with this sand coarse aggregate ratio value, determine the ratio of coarse aggregate and fines;
For the aggregate that uses gap grading, the cumulative distribution curve that the ratio of aggregate is piled up curve and various aggregates by ideal carries out numerical analysis;
1) described accumulation curve equation is:
P sdA100·A/Amax/;
Wherein, P sdAfor particles of aggregates is by the percentage of sieve aperture, b is aggregate empirical, d afor aggregate sieve diameter, D amaxmaximum particle diameter for particles of aggregates;
The value of empirical b requires to determine by formula according to the slump of ultra high performance cementitious or divergence:
When h≤220mm, b5h/h,
When h > 220mm, b5lh/h,
L is divergence design load, and h is slump design load, h 0height 300mm for slump bucket;
2) the particle cumulative distribution curve of various aggregates:
Sand required in aggregate and stone are obtained to cumulative distribution curve f separately through screening test smand f (d) rn(d);
F sm(d) be m# graded sand, m=1~5;
F rn(d) be n# grating stone, n=1~5; When not needing stone, do not consider the cumulative distribution curve of stone;
3) numerical analysis is as follows:
If it is X that m# graded sand accounts for the volume fraction of aggregate total amount sm, and the n# grating stone volume fraction that accounts for aggregate total amount be X rn, and meet ∑ Xsm ∑ Xrn1;
Setting the particle diameter cumulative distribution curve of aggregate after mixing is:
P A?∑Xsmfsm?d+∑Xrnfrn?d;
Volume fraction X to each component smand X rntake 0.001~0.05 as step-length, exhaustive computations P in span separately a, comparison curves P aand P sdA, calculate the corresponding abscissa particle diameter of identical ordinate d astandard deviation, get the X of standard deviation minimum smand X rnvalue is as each component proportion mark of 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, in described ultra high performance cementitious, also add fiber, 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 μ m, and fibre length is 1~100mm.
Ultra high performance cementitious as above, also adopts 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 processing to reinforcing bar.Described coating comprises: one or more coating combinations 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 one or more combination and the resin of organic synthetic fibers, glass fiber, basalt fibre to make.
Ultra high performance cementitious as above, applies prestressing force to arrangement of reinforcement.
Ultra high performance cementitious grooved section as above, the arrangement of reinforcement of section bar extends to the outer 50~1000mm of end face, can be chosen in that when product moulding is made, embedding refuting connects muscle in end simultaneously, and refuting the buried depth that connects reinforcing bar is 50~1000mm.
Ultra high performance cementitious grooved section as above, to section bar end face pre-embedded steel slab or 50~1000mm long with U-steel ultra high performance cementitious grooved section same cross-sectional.
Ultra high performance cementitious grooved section as above, pre-buried steel plate adopts and section bar identical cross-sectional shape steel plate or employing and the contour wide rectangular steel plates of ultra high performance cementitious grooved section.
Ultra high performance cementitious grooved section as above, adds ribs, the thickness t of rib at the web place of ultra high performance cementitious grooved section 1meet t 1/ t=0.5~2.Spacing between ribs is 1~500 times of the high H of section bar.
Ultra high performance cementitious grooved section as above, carries out face coat processing to Surface of profile by techniques such as brushing, roller coating or sprayings.Described coating comprises: one or more coating combinations 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 structure such as beam, post, stake of assembled architecture, building is had and be similar to the construction speed of steel work, but have the corrosion-proof fire-resistant performance higher than steel work section bar;
(2) by optimizing the grain composition of cementitious material grain composition and aggregate, reach the requirement that meets construction mobility under low water binder ratio;
(3) due to closestpacking design, the performances such as anti-permeability performance, anti-carbonation properties, chloride-penetration resistance, freeze thawing resistance circulation are better than ordinary concrete;
Accompanying drawing explanation
Fig. 1 is the grooved section sectional view of H/B=2
Fig. 2 is the grooved section sectional view of H/B=1
Wherein 1 is ultra high performance cementitious; The 2nd, arrangement of reinforcement.
The specific embodiment
Below in conjunction with the specific embodiment, further set forth the present invention.Should be understood that these embodiment are only not used in and limit the scope of the invention for the present invention is described.In addition should be understood that those skilled in the art can make various changes or modifications the present invention after having read the content of the present invention's instruction, these equivalent form of values fall within the application's appended claims limited range equally.
Embodiment 1
Ultrahigh-performance cement-based grooved section, wherein:
H=400mm、B=200mm、D=30mm、t=30mm、R=20mm、R 1=3mm;
Ultra high performance cementitious, comprises cementitious material, water and water reducing agent, and cement volume accounts for 21%, and described cement is that strength grade is 52.5 PI cement, and described mineral admixture is silicon ash and flyash, accounts for 52.5%.
The proportioning mark of cement, silicon ash and flyash piles up curve by ideal and its particle diameter cumulative distribution curve carries out numerical analysis;
1) the described desirable curve equation of piling up is:
P sd100·/max/;
Wherein, P sdfor particle is by the percentage of sieve aperture, A is empirical, and d is sieve diameter, D maxmaximum particle diameter for particle;
The value of empirical A requires to determine by formula according to the design slump of ultra high performance cementitious or design divergence:
Slump GB/T50080:150mm; The height h of slump bucket 0for 300mm;
A5·h/h=2.5;
2) the particle diameter cumulative distribution curve of each component of cementitious material:
To cement, silicon ash and flyash after tested obtain cumulative distribution curve f separately c(d), f sfand f (d) 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 μ m of cement.
3) numerical analysis is as follows:
If it is X that cement accounts for the volume fraction of binder total amount c, the silicon ash volume fraction that accounts for binder total amount is X sfthe volume fraction that accounts 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;
Setting the particle diameter cumulative distribution curve of cementitious material after mixing is:
P=X cf c(d)+X sff sf(d)+X faf fa(d),
Volume fraction X to each component c, X sfand X fatake 0.001 as step-length, exhaustive computations P in span separately, comparison curves P and P sd, on ordinate, get 5 Along ents in maximum value, calculate the standard deviation of the corresponding abscissa particle diameter of identical ordinate d, relatively obtain as calculated the X of standard deviation minimum c=0.286, X sf=0.190, X fa=0.524, respectively as the proportioning mark of cement, silicon ash and flyash;
The mass ratio W/B of the consumption of water and cementitious material is 0.124, 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 cementitious material 1.2%.
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/T50080:150mm;
After sclerosis, performance reaches following index:
Compressive strength, standard curing 28d:182MPa.
Water and build up cross section grooved section 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.To the thick epoxy anticorrosive coating of grooved section surface spraying 0.5mm.
Embodiment 2
Ultrahigh-performance cement-based grooved section, wherein:
H=400mm、B=400mm、D=50mm、t=30mm、R=25mm、R 1=5mm;
Ultra high performance cementitious, comprises cementitious material, water and water reducing agent, and cement volume accounts for 48.5%, and described cement is that strength grade is 62.5 PI cement, and described mineral admixture is silicon ash, flyash and breeze, and volume accounts for 17.6%%; The account form that each component proportion mark of cementitious material is pressed embodiment 1, obtains X c=0.734, X sf=0.107, X fa=0.088 and X bs=0.071.Water-cement ratio W/B=0.144, Admixture is used 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:196MPa.
Water and build up cross section grooved section 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 6.12%, adopts pre-tensioning system to apply prestressing force.The long grooved shaped steel of 50mm of the pre-buried connection of section material section and grooved section same cross-sectional.To grooved section and the thick polyurethane anticorrosion coating of joint shaped steel surface spraying 0.5mm.
Embodiment 3
Ultrahigh-performance cement-based grooved section, wherein:
H=400mm、B=200mm、D=30mm、t=30mm、R=20mm、R 1=3mm;
Ultra high performance cementitious, comprises cementitious material, fines, steel fibre, water and water reducing agent, and cement volume accounts for 26.5%, and described cement is that strength grade is 52.5 PII cement, and described mineral admixture is silicon ash, flyash and breeze, accounts for 15.8%.The account form that each component proportion mark of cementitious material is pressed 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 is used 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 grooved section 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.To the thick epoxy anticorrosive coating of grooved section surface spraying 0.5mm.
Embodiment 4
Ultrahigh-performance cement-based grooved section, wherein:
H=400mm、B=400mm、D=50mm、t=30mm、R=25mm、R 1=5mm;
Ultra high performance cementitious, comprises cementitious material, aggregate, fiber, water and water reducing agent, and cement volume accounts for 20%, and described cement is that strength grade is 62.5 PII cement, and described mineral admixture is silicon ash, flyash and breeze, accounts for 19%.The account form that each component proportion mark of cementitious material is pressed 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 μ m, length 12mm, and volume volume is 0.5%.Water-cement ratio W/B=0.208, Admixture is used 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 grooved section 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 6.12%.The rectangular steel plates that the wide high 20mm of the pre-buried connection of section material section and grooved section is thick.To grooved section and the thick polyurethane anticorrosion coating of joint shaped steel surface spraying 0.5mm.
Embodiment 5
Ultrahigh-performance cement-based grooved section, wherein:
H=400mm、B=200mm、D=30mm、t=30mm、R=20mm、R 1=3mm;
Ultra high performance cementitious, comprises cementitious material, fines, water reducing agent and water, and cement volume accounts for 32%, and described cement is that strength grade is 52.5 PO cement, and described mineral admixture is silicon ash and breeze, accounts for 15% of volume; The account form that each component proportion mark of cementitious material is pressed 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 cumulative distribution curve that the ratio of aggregate is piled up curve and various aggregates by ideal carries out numerical analysis;
1) described accumulation curve equation is:
P db100b·d/D/;
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 determine 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;
b5·h/h=3.25;
2) the particle cumulative distribution curve of various aggregates:
The cumulative distribution curve that above-mentioned 3 kinds of sand obtain separately through screening test is followed successively by f s1(d), f s2and f (d) s3(d).
3) numerical analysis is as follows:
If it is X that the graded sand of 1#, 2# and 3# accounts for the volume fraction of aggregate total amount s1, X s2and X s3, and meet X s1+ X s2+ X s3=1;
Setting the particle diameter cumulative distribution curve of aggregate after mixing is:
P A=X s1f s1(d)+X s2f s2(d)+X s3f s3(d);
Volume fraction X to each component s1, X s2and X s3take 0.002 as step-length, exhaustive computations P in span separately a, comparison curves P aand P sdA, calculate the corresponding abscissa particle diameter of identical ordinate d astandard deviation, relatively obtain as calculated the X of standard deviation minimum 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#;
Aggregate gets 0.564 with the ratio of cementitious material; Water-cement ratio is 0.167; Admixture is used polycarboxylate water-reducer solution, and volume is 1.4% of cementitious material quality; Fiber adopts vinal, and diameter is 40 μ m, 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.
Water and build up cross section grooved section 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 rectangular steel plates that the wide high 15mm of the pre-buried connection of section material section and grooved section is thick.To the thick acrylate corrosion-inhibiting coating of grooved section surface spraying 0.5mm.
Embodiment 6
Ultrahigh-performance cement-based grooved section, adds ribs at the web place of section bar, wherein:
H=400mm, B=400mm, D=50mm, t=30mm, R=25mm, R 1=5mm, t 1=50mm, ribs spacing=1000mm;
Ultra high performance cementitious, comprises cementitious material, aggregate, water reducing agent and water, and cement volume accounts for 24.5%, and described cement is that strength grade is 52.5 PII cement, and described mineral admixture is silicon ash and breeze, accounts for 11.2% of volume; The account form that each component proportion mark of cementitious material is pressed 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;
Aggregate gets 1.275 with the ratio of cementitious material; Water-cement ratio is 0.148; Admixture is used 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 grooved section 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 6.12%.The arrangement of reinforcement of section bar extends to the outer 300mm of end face.To grooved section and the thick fluorine carbon corrosion-inhibiting coating of joint shaped steel surface spraying 0.5mm.

Claims (10)

1. a ultrahigh-performance cement-based grooved section, is characterized in that: the height dimension of this cement based grooved section is made as H, the wide size of leg and is made as B, the thick size of waist and is made as that D, average leg thickness are made as t, waist end arc radius is made as R and leg end arc radius is made as R 1time, meet: H/B=0.8~3; D/B=0.1~0.5; T/H=0.05~0.5; R/B=0.05~0.5; R 1/ t=0.1~0.5;
Described ultrahigh-performance cement-based grooved section is built and is formed by ultra high performance cementitious; Described ultra high performance cementitious comprises cementitious material, Admixture and water, described cementitious material is cement and mineral admixture, described cement is that strength grade is 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 particle diameter cumulative distribution curve that the proportioning mark of described each component of cementitious material is piled up curve and each component of cementitious material by ideal carries out numerical analysis;
1) the described desirable curve equation of piling up is:
P sd100·/max/;
Wherein, P sdfor particle is by the percentage of sieve aperture, A is empirical, and d is sieve diameter, D maxmaximum particle diameter for particle;
The value of empirical A requires to determine by formula according to the design slump of ultra high performance cementitious or design divergence:
When h≤220mm, A5h/h,
When h > 220mm, A5lh/h,
L is divergence design load, and h is slump design load, h 0height 300mm for 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 cumulative distribution curve f separately c(d), f sf(d), f faand f (d) bs(d);
3) numerical analysis is as follows:
If it is X that cement accounts for the volume fraction of binder total amount 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 that accounts 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;
Setting the particle diameter cumulative distribution curve of cementitious material after mixing is:
P=X cf c(d)+X sff sf(d)+X faf fa(d)+X bs?f bs(d),
Volume fraction X to each component c, X sf, X faand X bstake 0.001~0.01 as step-length, exhaustive computations P in span separately, comparison curves P and P sd, calculate the standard deviation of the corresponding abscissa particle diameter of identical ordinate d, get the X of standard deviation minimum c, X sf, X faand X bsvalue is as each component proportion mark of cementitious material;
The mass ratio W/B of the consumption of water and cementitious material is 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 that calculates the preparation of gained proportioning, flowability properties is as follows:
Slump GB/T50080: >=10mm;
Or divergence GB/T50080: >=450mm;
Only when high fluidity is slump > 220mm, just test divergence, now concrete flowability is as the criterion with divergence;
After material sclerosis, 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 < < for the GBFS > > GB/T18046 of cement and concrete; 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, water reducing agent is selected more than 25% water reducing agent of water-reducing rate, 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 cementitious material 0.1%~5%.
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 the aggregate that uses continuous grading, during the mixture of preparation fines and coarse aggregate, calculate the sand coarse aggregate ratio value that fines is just in time filled coarse aggregate space, with this sand coarse aggregate ratio value, determine the ratio of coarse aggregate and fines;
For the aggregate that uses gap grading, the cumulative distribution curve that the ratio of aggregate is piled up curve and various aggregates by ideal carries out numerical analysis;
1) described accumulation curve equation is:
P sdA100·A/Amax/;
Wherein, P sdAfor particles of aggregates is by the percentage of sieve aperture, b is aggregate empirical, d afor aggregate sieve diameter, D amaxmaximum particle diameter for particles of aggregates;
The value of empirical b requires to determine by formula according to the slump of ultra high performance cementitious or divergence:
When h≤220mm, b5h/h,
When h > 220mm, b5Lh/h,
L is divergence design load, and h is slump design load, h 0height 300mm for slump bucket;
2) the particle cumulative distribution curve of various aggregates:
Sand required in aggregate and stone are obtained to cumulative distribution curve f separately through screening test smand f (d) rn(d);
F sm(d) be m# graded sand, m=1~5;
F rn(d) be n# grating stone, n=1~5; When not needing stone, do not consider the cumulative distribution curve of stone;
3) numerical analysis is as follows:
If it is X that m# graded sand accounts for the volume fraction of aggregate total amount sm, and the n# grating stone volume fraction that accounts for aggregate total amount be X rn, and meet ∑ Xsm ∑ Xrn1;
Setting the particle diameter cumulative distribution curve of aggregate after mixing is:
P A?∑Xsmfsm?d+∑Xrnfrn?d;
Volume fraction X to each component smand X rntake 0.001~0.05 as step-length, exhaustive computations P in span separately a, comparison curves P aand P sdA, calculate the corresponding abscissa particle diameter of identical ordinate d astandard deviation, get the X of standard deviation minimum smand X rnvalue is as each component proportion mark of 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, in described ultra high performance cementitious, also add fiber, 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 μ m, and fibre length is 1~100mm.
7. ultra high performance cementitious according to claim 1, it is characterized in that, in described ultra high performance cementitious, also adopt plain bars, high tensile reinforcement, steel strand or fibre composite reinforcement to carry out arrangement of reinforcement, reinforcement ratio is between 0.2%~20%; While building, arrangement of reinforcement is applied to prestressing force; Described fibre composite reinforcement adopts one or more combination and the resin of organic synthetic fibers, glass fiber, basalt fibre to make; Reinforcing bar is carried out to coating antiseptic processing or arrangement of reinforcement material employing stainless steel; Describedly reinforcing bar is carried out to coating antiseptic process and to refer to Surface of profile is carried out to face coat processing by brushing, roller coating or spraying coating process, described coating comprises: one or more coatings combinations 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 grooved section 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 be chosen in that when product moulding is made, embedding refuting connects muscle in end simultaneously, and refuting the buried depth that connects reinforcing bar is 50~1000mm.
9. ultra high performance cementitious grooved section according to claim 1, is characterized in that, to section bar end face pre-embedded steel slab or 50~1000mm long with U-steel ultra high performance cementitious grooved section same cross-sectional; Pre-buried steel plate adopts and section bar identical cross-sectional shape steel plate or employing and the contour wide rectangular steel plates of ultra high performance cementitious grooved section.
10. ultra high performance cementitious grooved section according to claim 1, is characterized in that, at the web place of ultra high performance cementitious grooved section, adds ribs, the thickness t of rib 1meet t 1/ t=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 0elemental height for section bar.
CN201410100801.5A 2014-03-18 2014-03-18 Ultra-high performance cement based groove type profile Pending CN103938794A (en)

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CN105256709A (en) * 2015-10-28 2016-01-20 上海罗洋新材料科技有限公司 Ultra-high performance cement-based pi-shaped girder poured with ultra-high performance cement-based composite
CN105386563A (en) * 2015-10-28 2016-03-09 上海罗洋新材料科技有限公司 Ultra-high performance cement-based H-shaped section bar
CN105421659A (en) * 2015-10-28 2016-03-23 上海罗洋新材料科技有限公司 Ultra-high performance cement-based groove type profile

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CN105421659A (en) * 2015-10-28 2016-03-23 上海罗洋新材料科技有限公司 Ultra-high performance cement-based groove type profile

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Application publication date: 20140723