CN105731916A - Dense polymer emulsion-fiber combined modified cement concrete functional layer - Google Patents
Dense polymer emulsion-fiber combined modified cement concrete functional layer Download PDFInfo
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Abstract
The invention discloses a dense polymer emulsion-fiber combined modified cement concrete functional layer. The cement concrete functional layer is prepared from 14.29-15.10 parts by weight of cement, 3.67-4.08 parts by weight of a butylbenzene emulsion, 0.01-0.03 parts by weight of organic fibers, 4.08-4.904 parts by weight of water, 42.86-46.94 parts by weight of coarse aggregate and 26.53-30.61 parts by weight of sand powder. The cement concrete functional layer improves concrete strength, forms a dense structure in concrete, realizes density of 99.5% or more, improves bonding performances of components in concrete, improves a bonding capacity of a set cement base and an aggregate, improves a gap of an interfacial transition zone, fills gaps of set cement, reduces microcracks in hardened cement paste, further improves bonding strength of polyester fibers and set cement, improves cement concrete strengthening effects of fibers and reduces fiber drawing in breaking.
Description
Technical field
The present invention relates to the cement concrete functional layer that a kind of compact-type polymer emulsion is modified with fiber composite, belong to engineering material technical field.
Background technology
Along with developing rapidly of China's economy, the volume of traffic constantly increases, Highway Cause is in flourish period, construction technology is ripe gradually, China is vast in territory, complex geologic conditions, various high-grade highways also spread to wide mountain area gradually, and constantly the building so that vcehicular tunnel quantity a larger increase of the high-grade highway in mountain area.
Highway in China tunnel mainly adopts cement concrete pavement, in order to improve the comfortableness on road surface, is also adopted by asphalt concrete pavement in recent years in shorter vcehicular tunnel.
1, asphalt concrete pavement
Asphalt concrete pavement is as a kind of flexible pavement material, and himself more weak bearing capacity ability causes under local function, it is easy to rut occurs, permanent deformation then can be caused under long term, cause surface laterally passage, form the diseases such as pit, oil bag and wave, reduce the service life on road surface.Bituminous concrete opposing temperature change capabilities is poor, be typically in summer temp higher time, bituminous concrete is subject to the cyclic reverse loading of wheel, it is easy to be deformed, the phenomenon such as rut, not only reduces the flatness on road surface, and reduce the safety of driving, and when temperature is relatively low in the winter time, the plasticity of Colophonium reduces, the ability of its resistance to deformation declines, under the cyclic reverse loading of vehicle, easily produce crack, be substantially reduced the service life of asphalt concrete pavement；Further, asphalt concrete pavement is affected relatively big by water, and under the thermograde long-term combined effect with vehicular load, when bituminous paving exceedes its resistivity, it is easy to ftracture, these cracks, once be invaded by moisture, can cause the destruction of road surface larger area；Owing to road asphalt is second-rate, Colophonium mostly dependence on import, costs rather expensive used by the highway that China built in recent years.
In longer vcehicular tunnel, China does not generally adopt asphalt concrete pavement, and mainly due to tunnel medium pitch concrete pavement construction inclement condition, a large amount of irritating smog produced in asphalt paving process, and tunnel internal air is not smooth, constructional difficulties；The poor fire of Colophonium simultaneously, in tunnel during breaking out of fire, Colophonium burning easily increases the weight of fire spreading, increases and puts out difficulty, greatly reduces the safety in tunnel.
2, cement concrete pavement
General cement concrete pavement has the advantage that: intensity is high, temperature stability is good, long service life, to be not likely to produce plastic deformation, maintenance costs relatively low.Adopt cement concrete pavement to there is also a lot of inevitably problem simultaneously, such as: (1) is in order to meet the bearing requirements on road surface, required cement is bigger with the amount of water, on average every cube of cement consuming about 0.4 ~ 0.5 ton is more with the various seam of water (2) cement concrete pavement of 0.15 ton, these seams also for faulting of slab ends, arch upward, offer condition is damaged on the road surface such as purt mud.(3) curing time is longer, extends the traffic open hour, and general cement concrete pavement needs maintenance more than one month ability open to traffic.(4) flatness is poor, and rigidity is relatively big, and therefore road-ability is poor, and noise is bigger.(5) owing to the wearability of general cement concrete pavement is poor, therefore antiskid performance degradation is very fast, causes safety factor of travel to decrease.
Therefore for the construction in highway in China tunnel, especially in some, in long-highway-tunnel, common cement concrete pavement and bituminous paving are all difficult to meet requirement special in vcehicular tunnel, and under this form, developing a kind of novel Highway Pavement Structures material becomes current.
Summary of the invention
It is an object of the invention to: a kind of road surface styrene-butadiene emulsion and fiber composite modified cement-concrete surface functional layer are provided, it is specifically related to a kind of composite modified cement concrete with styrene-butadiene emulsion, cement, auxiliary rheological agents, pigment, polyester fiber, water, coarse aggregate, sand, silica flour, there is toughness and intensity is high, cracking resistance is excellent, the feature that durability is strong, build and functional betterment works suitable in highway pavement, thus overcoming the deficiencies in the prior art.
Technical scheme
The cement concrete functional layer that compact-type polymer emulsion is modified with fiber composite, it is characterised in that: this cement concrete functional layer is prepared from by following raw material: cement 14.29 ~ 15.10 parts, styrene-butadiene emulsion 3.67 ~ 4.08 parts, organic fiber 0.01 ~ 0.03 part, 4.08 ~ 4.904 parts of water, coarse aggregate 42.86 ~ 46.94 parts, sand powder 26.53 ~ 30.61.
In the cement concrete functional layer that aforesaid compact-type polymer emulsion is modified with fiber composite, in above-mentioned cement concrete functional layer added with auxiliary rheological agents, the weight portion of this auxiliary rheological agents is 0.18 ~ 0.25, described auxiliary rheological agents is water reducer or the naphthalene water reducer of polycarboxylic acids, this auxiliary rheological agents can reduce concrete unit consumption of water, improve its anti-bleeding energy and adhesion, the water reducer of polycarboxylic acids or the auxiliary rheological agents of naphthalene water reducer that adopt are not result in styrene-butadiene emulsion and breakdown of emulsion occur before film forming simultaneously, fresh concrete is made to adopt the improvement VC value that the rich consistometer of dimension records to be 5 ± 1s by changing auxiliary rheological agents at the content of above-mentioned cement concrete.
In the cement concrete functional layer that aforesaid compact-type polymer emulsion is modified with fiber composite; in above-mentioned cement concrete functional layer added with pigment; the weight portion of this pigment is 1.5 ~ 2.5; described pigment is inorganic pigment and is Powdered; pulverous inorganic pigment both can guarantee that the color required for cement concrete retaining layer; can disperse very well in concrete mixing process again and in concrete; make coagulating cement protective soil layer color even, be also not result in causing that breakdown of emulsion occurs styrene-butadiene emulsion before film forming.
In the cement concrete functional layer that aforesaid compact-type polymer emulsion is modified with fiber composite, in above-mentioned cement concrete functional layer added with silica flour, the weight portion of this silica flour is 1.22 ~ 2.04, the silica flour adopted is 400 ~ 500 orders, wherein the content of SiO2 is more than 90%, and this silica flour can further enhance concrete density, strength character and durability；Cement, silica flour hydrated product can be that thin polymer film (this thin polymer film is formed in concrete by styrene-butadiene emulsion) provides good protection; effectively prevent thin polymer film and UV contact; ensure that concrete is still functioned as good modifying function by polymer in a long time, also improve concrete durability further.
In the cement concrete functional layer that aforesaid compact-type polymer emulsion is modified with fiber composite, described cement can be Portland cement, is numbered more than P.O42.5.
In the cement concrete functional layer that aforesaid compact-type polymer emulsion and fiber composite are modified, described styrene-butadiene emulsion is the anion-type water-thinned emulsion that the copolymer of styrene and butadiene is formed, and this copolymer will not hinder the chemical reaction of cement and water；And possess good stability, breakdown of emulsion will not occur after contacting with cement, pigment, auxiliary rheological agents, silica flour；Have relatively low minimum film formation temperature be beneficial to concrete under common room temperature can continuous film forming, the thin polymer film after film forming has stronger adhesive property；The polymeric film formed can have good resistance to water, alkali resistance and weatherability.
In the cement concrete functional layer that aforesaid compact-type polymer emulsion is modified with fiber composite, described organic fiber adopts polyester fiber, and shortest length should be greater than the 1/3 of coarse aggregate nominal maximum aggregate size；Greatest length not should be greater than 2 times of coarse aggregate nominal maximum aggregate size；The deviation of polyester fiber length and nominal value is not to be exceeded ± 10%.
In the cement concrete functional layer that aforesaid compact-type polymer emulsion is modified with fiber composite, described coarse aggregate adopts basaltic broken stone or limestone gravel, ballast grain sizes is 4.75mm ~ 9.5mm, crush values < 15%, abrasion loss < 28%, flat-elongated particles content < 12%, clod content < 1.0%, content of stone powder < 0.5%.
In the cement concrete functional layer that aforesaid compact-type polymer emulsion is modified with fiber composite, the modulus of fineness of described sand is 2.8 ~ 3.0, content of stone powder < 0.5%.
Owing to adopting technique scheme, compared with prior art, in the present invention, styrene-butadiene emulsion can improve the workability of cement concrete, and its water-reduction reduces the ratio of mud, is effectively increased concrete strength character；The polymer that styrene-butadiene emulsion and cement etc. are constituted adds the workability of fresh cement concrete, after paver roller-compaction, inside concrete is made to form compact structure, reach the degree of compaction of more than 99.5%, gel material content can not only effectively be saved by this compact structure, improve concrete degree of compaction simultaneously, effectively raise concrete impermeability；The aquation of cement and condensation hardening process can be had impact by polymer, and the some chemical properties of emulsion can react with the hydrated product Ca (OH) 2 of cement simultaneously；Increase the adhesive property between each component of inside concrete；The addition of styrene-butadiene emulsion improves the cementitiousness between cement stone substrate and aggregate, improve the gap of interfacial transition zone, fill up the space in Behavior of Hardened Cement Paste, reduce the micro-crack in petrifying water mudstone, therefore improve strength character and the impermeability of cement concrete, coordinate the silica flour can the long durability energy of Concrete Structure simultaneously；Polymer emulsion further enhances the bonding of polyester fiber and Behavior of Hardened Cement Paste, the fortifying fibre reinforced effects to cement concrete, reduces the phenomenon that in destructive process, fiber is pulled out；The addition of silica flour can further enhance strength character and the durability of cement-based material, provides good protection for polymeric film, extends concrete service life.
Detailed description of the invention
The present invention is described in further detail below, but not as any limitation of the invention.
Embodiments of the invention: the cement concrete functional layer that a kind of compact-type polymer emulsion is modified with fiber composite, this cement concrete functional layer is prepared from by following raw material: cement 14.29 ~ 15.10 parts, styrene-butadiene emulsion 3.67 ~ 4.08 parts, organic fiber 0.01 ~ 0.03 part, 4.08 ~ 4.90 parts of water, coarse aggregate 42.86 ~ 46.94 parts, sand powder 26.53 ~ 30.61, auxiliary rheological agents 0.18 ~ 0.25 part, pigment 1.5 ~ 2.5 parts, silica flour 1.22 ~ 2.04 parts.
Wherein styrene-butadiene emulsion is key components, and modified to cement concrete plays an important role.
Selected styrene-butadiene emulsion is carboxylic styrene butadiene latex, for the anion-type water-thinned emulsion that the copolymer of butadiene Yu both styrene is formed.Its principal character is as shown in the table:
The principal character of table 1 styrene-butadiene emulsion
Additionally selected styrene-butadiene emulsion to meet the following conditions:
To the highly active ion of release in cement hydration process, as Ca2+ and Al3+ has significantly high stability, do not hinder the curing reaction that cement produces with water；There is significantly high mechanical stability, especially in metering, conveying, will not breakdown of emulsion under high shear forces when pumping and stirring；Good storage stability；Low bleed；All relatively low minimum film formation temperature are beneficial in concrete continuous film forming, its minimum film formation temperature require than practice of construction time temperature low, and with gather materials and hydrolysis product of cement has stronger caking ability；The film formed should have fabulous resistance to water, alkali resistance and weatherability；
The cement grade of configuration is P.O42.5 and Portland cement above；
Gather materials employing basaltic broken stone or the limestone gravel of configuration, and answer clean, dry, rough surface, parent rock comprcssive strength should be not less than 100MPa；Specification of gathering materials is 4.75mm ~ 9.5mm；With reference to bituminous concrete AC gradation design, give full play to the adhesive property of cement and polymer emulsion composite slurry.
The auxiliary rheological agents of configuration adopts the product that model is WLG-1 of Wuhan University of Technology's independent research；The concrete consumption of auxiliary rheological agents is when the reinforcement of concrete water yield is tried one's best low, makes fresh concrete adopt the improvement VC value that the rich consistometer of dimension records to be 5 ± 1s by adjusting the consumption of auxiliary rheological agents.
The pigment of configuration can adopt the pigment of different colours as required, is generally adopted inorganic material, such as powdery graphite, and volume then depth adjustment according to color, and untoward reaction can not be produced with styrene-butadiene emulsion, auxiliary rheological agents；
The fiber of configuration mainly adopts the organic fiber of 6 ~ 12mm, it is desirable to can produce good cementitiousness with styrene-butadiene emulsion, and be easily dispersed；
The silica flour of configuration adopts 400 ~ 500 orders; the progressive density of Concrete Structure, strength character and durability; cement, silica flour hydrated product can provide good protection for thin polymer film; effectively prevent thin polymer film and UV contact; ensure that concrete is still functioned as good modifying function by polymer in a long time, also improve concrete durability further.
The road surface styrene-butadiene emulsion adopted and fiber, the composite modified cement concrete surface functional layer of silica flour, it mainly possesses good economic technology benefit:
(1) this composite modified cement concrete has higher rupture strength, and when cement consumption is 350kg/m3, its 28 days rupture strengths reach 7.5MPa, improves about 35% compared to normal concrete, and bend-press ratio improves about 130% simultaneously
(2) pressure-proof elasticity modulus of composite modified cement concrete is compared portland cement concrete and is reduced and be about 45%, effectively reduces the fragility of cement, improves the ability of road surface resistance to deformation.
(3) the relatively common cement of 28 days bent toughness coefficients of composite modified styrene-butadiene emulsion modified cement-concrete improves about 3 times, substantially increases the ability that road surface opposing destroys, improves bearing capacity.
(4) composite modified styrene-butadiene emulsion modified cement-concrete has specific consistometric value so that it is after asphalt-spreader paves, construction depth is about 0.9mm, and antiskid pendulum value, at more than 40BPN, possesses good anti-slide performance；And its abrasion resistance properties improves about 50% compared to normal concrete.
(5) infiltration coefficient of composite modified styrene-butadiene emulsion modified cement-concrete is 62ml/min, less than asphalt concrete.
(6) the freeze proof grade of composite modified styrene-butadiene emulsion modified cement-concrete reaches more than F200, and its durability factor is about 0.47, improves about 70% compared to normal concrete.
(7) freshly mixed composite modified styrene-butadiene emulsion modified cement-concrete denseness adopts the rich consistometer of dimension to carry out the mensuration of denseness, and it improves VC value and controls at 5 ± 1s.
Detailed description of the invention
Certain tunnel adopts styrene-butadiene emulsion and fiber composite modified cement-concrete surface functional layer, is cement stabilized macadam base, it is desirable to facing concrete strength grade is not less than 4MPa, and comprcssive strength is not less than 20MPa, and flatness is not more than 3mm under surface layer；The surface anti-skid construction degree of depth is more than 0.7mm.
The match ratio used is: cement, styrene-butadiene emulsion, auxiliary rheological agents, black pigment, polyester fiber, water, coarse aggregate, sand, silica flour are according to quality:
14.69: constituted at 3.88: 0.22: 1.84: 0.02: 4.49: 44.90: 28.57: 1.63；
Auxiliary rheological agents is the product that model is WLG-1 of Wuhan University of Technology's independent research；The polyester fiber length adopted is 6mm, and diameter is 0.014 ± 0.005mm；Silica flour adopts 400 orders, Si02 content to be 98%.
Black fuel adopts pulverous graphite powder.
In advance styrene-butadiene emulsion, auxiliary rheological agents and part water are stirred, again through corresponding metering device by emulsion suction blender, it is necessary to adopt interval forced mixer to mix and stir production, it is ensured that often wheel mixing time is more than 70s；Control fresh concrete quality, it is ensured that fiber is dispersed, without isolation and clustering phenomena, adopt dumper to transport straight front court asphalt-spreader after production and pave molding, have suffered journey quickly effective；
Styrene-butadiene emulsion modified concrete road surface after molding adopts membrane curing 3 days, ensures that material does not contact with open fire in maintenance processes as far as possible.
Claims (9)
1. the cement concrete functional layer that compact-type polymer emulsion is modified with fiber composite, it is characterised in that: this cement concrete functional layer is prepared from by following raw material: cement 14.29 ~ 15.10 parts, styrene-butadiene emulsion 3.67 ~ 4.08 parts, organic fiber 0.01 ~ 0.03 part, 4.08 ~ 4.904 parts of water, coarse aggregate 42.86 ~ 46.94 parts, sand powder 26.53 ~ 30.61.
2. the cement concrete functional layer that compact-type polymer emulsion according to claim 1 is modified with fiber composite, it is characterized in that: in above-mentioned cement concrete functional layer added with auxiliary rheological agents, the weight portion of this auxiliary rheological agents is 0.18 ~ 0.25, and described auxiliary rheological agents is water reducer or the naphthalene water reducer of polycarboxylic acids.
3. the cement concrete functional layer that compact-type polymer emulsion according to claim 1 is modified with fiber composite, it is characterized in that: in above-mentioned cement concrete functional layer added with pigment, the weight portion of this pigment is 1.5 ~ 2.5, and described pigment is inorganic pigment and is Powdered.
4. the cement concrete functional layer that compact-type polymer emulsion according to claim 1 is modified with fiber composite, it is characterized in that: in above-mentioned cement concrete functional layer added with silica flour, the weight portion of this silica flour is 1.22 ~ 2.04, the silica flour adopted is 400 ~ 500 orders, and wherein the content of SiO2 is more than 90%.
5. the cement concrete functional layer that compact-type polymer emulsion according to claim 1 is modified with fiber composite, it is characterised in that: described cement can be Portland cement, is numbered more than P.O42.5.
6. the cement concrete functional layer that compact-type polymer emulsion according to claim 1 and fiber composite are modified, it is characterised in that: described styrene-butadiene emulsion is the anion-type water-thinned emulsion that the copolymer of styrene and butadiene is formed.
7. the cement concrete functional layer that compact-type polymer emulsion according to claim 1 is modified with fiber composite, it is characterised in that: described organic fiber adopts polyester fiber, and shortest length should be greater than the 1/3 of coarse aggregate nominal maximum aggregate size；Greatest length not should be greater than 2 times of coarse aggregate nominal maximum aggregate size；The deviation of polyester fiber length and nominal value is not to be exceeded ± 10%.
8. the cement concrete functional layer that compact-type polymer emulsion according to claim 1 is modified with fiber composite, it is characterized in that: described coarse aggregate adopts basaltic broken stone or limestone gravel, ballast grain sizes is 4.75mm ~ 9.5mm, crush values < 15%, abrasion loss < 28%, flat-elongated particles content < 12%, clod content < 1.0%, content of stone powder < 0.5%.
9. the cement concrete functional layer that compact-type polymer emulsion according to claim 1 is modified with fiber composite, it is characterised in that: the modulus of fineness of described sand is 2.8 ~ 3.0, content of stone powder < 0.5%.
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Cited By (3)
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| CN106220049A (en) * | 2016-07-08 | 2016-12-14 | 黄毅 | Nanometer strengthens permeable concrete |
| CN106396549A (en) * | 2016-08-31 | 2017-02-15 | 盼石（上海）新材料科技股份有限公司 | Environment-friendly water-permeable concrete and preparation method thereof |
| CN110194628A (en) * | 2019-06-27 | 2019-09-03 | 长安大学 | Buffer crack-resistant layer, preparation method, concrete road surface structure and preparation method thereof |
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| CN110194628A (en) * | 2019-06-27 | 2019-09-03 | 长安大学 | Buffer crack-resistant layer, preparation method, concrete road surface structure and preparation method thereof |
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Application publication date: 20160706 |