CN103951350A - Lightweight aggregate concrete for heat preservation of structures - Google Patents
Lightweight aggregate concrete for heat preservation of structures Download PDFInfo
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- CN103951350A CN103951350A CN201410172002.9A CN201410172002A CN103951350A CN 103951350 A CN103951350 A CN 103951350A CN 201410172002 A CN201410172002 A CN 201410172002A CN 103951350 A CN103951350 A CN 103951350A
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- aggregate concrete
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- thermal insulation
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- 239000004567 concrete Substances 0.000 title claims abstract description 130
- 238000004321 preservation Methods 0.000 title abstract 7
- 239000000463 material Substances 0.000 claims abstract description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000003638 reducing agent Substances 0.000 claims abstract description 25
- 239000004568 cement Substances 0.000 claims abstract description 23
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 238000009413 insulation Methods 0.000 claims description 41
- 239000011324 bead Substances 0.000 claims description 25
- 239000011521 glass Substances 0.000 claims description 25
- 239000011325 microbead Substances 0.000 claims description 24
- 238000004017 vitrification Methods 0.000 claims description 24
- 239000003795 chemical substances by application Substances 0.000 claims description 19
- -1 polypropylene Polymers 0.000 claims description 15
- 229920000126 Latex Polymers 0.000 claims description 14
- 239000004816 latex Substances 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 14
- 239000000835 fiber Substances 0.000 claims description 13
- 239000010881 fly ash Substances 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 13
- 230000002940 repellent Effects 0.000 claims description 9
- 239000005871 repellent Substances 0.000 claims description 9
- 239000011398 Portland cement Substances 0.000 claims description 8
- 230000004048 modification Effects 0.000 claims description 8
- 238000006011 modification reaction Methods 0.000 claims description 8
- 239000004743 Polypropylene Substances 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- RTZKZFJDLAIYFH-UHFFFAOYSA-N diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 229920001155 polypropylene Polymers 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 5
- 239000003469 silicate cement Substances 0.000 claims description 4
- VUKAUDKDFVSVFT-UHFFFAOYSA-N 2-[6-[4,5-bis(2-hydroxypropoxy)-2-(2-hydroxypropoxymethyl)-6-methoxyoxan-3-yl]oxy-4,5-dimethoxy-2-(methoxymethyl)oxan-3-yl]oxy-6-(hydroxymethyl)-5-methoxyoxane-3,4-diol Chemical compound COC1C(OC)C(OC2C(C(O)C(OC)C(CO)O2)O)C(COC)OC1OC1C(COCC(C)O)OC(OC)C(OCC(C)O)C1OCC(C)O VUKAUDKDFVSVFT-UHFFFAOYSA-N 0.000 claims description 3
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 3
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 3
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000005304 joining Methods 0.000 claims description 2
- 229920005646 polycarboxylate Polymers 0.000 claims 1
- 239000004576 sand Substances 0.000 abstract description 6
- 239000004566 building material Substances 0.000 abstract description 3
- 235000019362 perlite Nutrition 0.000 abstract description 3
- 239000010451 perlite Substances 0.000 abstract description 3
- 239000011806 microball Substances 0.000 abstract 2
- 239000003607 modifier Substances 0.000 abstract 1
- 230000002195 synergetic Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 9
- 238000010276 construction Methods 0.000 description 6
- 238000011068 load Methods 0.000 description 6
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000002209 hydrophobic Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 238000003776 cleavage reaction Methods 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- 239000011381 foam concrete Substances 0.000 description 3
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- LFQCEHFDDXELDD-UHFFFAOYSA-N Tetramethyl orthosilicate Chemical compound CO[Si](OC)(OC)OC LFQCEHFDDXELDD-UHFFFAOYSA-N 0.000 description 2
- 229920003086 cellulose ether Polymers 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 206010011376 Crepitations Diseases 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive Effects 0.000 description 1
- 230000003487 anti-permeability Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 125000005373 siloxane group Chemical group [SiH2](O*)* 0.000 description 1
- 150000003385 sodium Chemical group 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
Classifications
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to lightweight aggregate concrete for heat preservation of structures, and belongs to the technical field of building materials for civilian use. The lightweight aggregate concrete for heat preservation of structures comprises the following raw materials in parts by mass: 360-460 parts of cement-based cementing material, 410-460 parts of ceramsite, 110-120 parts of modified vitrified micro balls, 15-20 parts of concrete modifier, 260-290 parts of water and 3.6-4.6 parts of water reducing agent. The lightweight aggregate concrete for heat preservation of structures with the heat conductivity coefficient of 0.25-0.4W/(m.K) and the dry apparent density of 900-1200kg/m<3> is obtained by using the modified vitrified micro balls and the ceramsite as aggregates under the synergistic effect of the components according to a reasonable component proportion, and after the lightweight aggregate concrete is cured for 28 days, the compressive strength of the lightweight aggregate concrete is 8-15MPa. The lightweight aggregate concrete for heat preservation of structures has good heat preservation performance and relatively high strength. Compared with the strength of a full lightweight concrete material prepared from ceramsite perlite, the strength of the lightweight aggregate concrete is obviously improved; compared with the heat conductivity coefficient of a full lightweight concrete material prepared from ceramsite pottery sand, the heat conductivity coefficient of the lightweight aggregate concrete is obviously reduced; and the lightweight aggregate concrete can be used as a lightweight aggregate concrete material for heat preservation of structures.
Description
Technical field
The present invention relates to a kind of structural thermal insulation lightweight aggregate concrete, belong to building materials for civilan use preparing technical field.
Background technology
Along with covil construction power consumption increases, lightweight aggregate concrete is more and more extensive in building field application, and to lightweight aggregate concrete, material requirements also improves constantly people.A series of superior features such as lightweight aggregate concrete lightweight, thermal conductivity are low are more and more subject to everybody favor in building material market.Along with the intensification of people to light skeletal understanding, the problem that the thermal conductivity of lightweight aggregate concrete and intensity can not be taken into account further applies and brings huge challenge also to lightweight aggregate concrete.
Full lightweight concrete is that coarse-fine aggregate is the lightweight aggregate concrete that light skeletal mixing forms.In full lightweight concrete, the pellet density of light skeletal is generally less than the density of cement slurry, so just there will be floating in various degree at the little light skeletal of the process density of mix.On microcosmic, present inhomogeneous and lose successional phenomenon because the floating of light skeletal causes concrete, in macroscopic view, presenting segregation demixing phenomenon; Thereby have influence on the performance of full lightweight concrete.
In prior art, in full lightweight concrete material, light fine aggregate adopts the in the majority of pearlstone and pottery sand.Although adopt the full lightweight concrete strength ratio that pottery sand is light fine aggregate higher, apparent density is bigger than normal, thermal conductivity is higher, thereby has affected the high-performance of this material in energy saving building.The full lightweight concrete strength of materials prepared by the ceramsite and ceramic sand of China's employing is at present generally at 10～30Mpa, but apparent density is generally greater than 1400kg/m
3, thermal conductivity has reached 0.4～0.8w/ (m.k) especially.Although and to adopt pearlstone be light fine aggregate full lightweight concrete light weight, heat-insulating property is superior, intensity generally, between 2～3Mpa, does not reach the object of material load-bearing, has therefore limited the further application of this material in energy saving building yet.Along with the development of light fine aggregate technology, glass bead arises at the historic moment.Glass bead has the speciality such as intensity is high, water-intake rate is little compared with pearlstone, thereby progressively substitutes pearlstone, becomes the leading product in market.At present, in pertinent literature, have not been reported as the full lightweight concrete material of aggregate using modified vitrification micro-bead and haydite.
Summary of the invention
The deficiency existing for existing full lightweight concrete; the present invention on the lenient side modification angle of fine aggregate glass bead sets out, and a kind of structural thermal insulation lightweight aggregate concrete building enclosure, that ultimate compression strength is high, thermal conductivity is low, cost is low that can be used for making not only load-bearing but also be incubated is provided.
A kind of structural thermal insulation lightweight aggregate concrete of the present invention, its raw material comprises according to the mass fraction:
360～460 parts of cement-based gelling materials; Be preferably 400-420 part;
410～460 parts of haydites; Be preferably 430-450 part;
102～120 parts of modified vitrification micro-beads; Be preferably 110-115 part;
15～20 parts of concrete modifying agents; Be preferably 16-18;
3.6～4.6 parts of water reducers; Be preferably 4.0-4.2 part;
Described cement-based gelling material comprises by percentage to the quality, flyash 10%～20%, silicate cement 80%～90%;
Described modified vitrification micro-bead is the glass bead adopting after organosilicon moisture repellent modification;
Described concrete modifying agent comprises by percentage to the quality, dispersibility latex powder 93.46%-95.01%; Anti-crack fiber 4.75%-6.23%; Thickening material 0.16%-0.31%;
The water-reducing rate of described water reducer is 20%～30%.
A kind of structural thermal insulation lightweight aggregate concrete of the present invention, described silicate cement is 42.5 grades of ordinary Portland cements.Described flyash is I level flyash, is preferably Xiangtan Power Plant I level flyash.
A kind of structural thermal insulation lightweight aggregate concrete of the present invention, described haydite is that particle diameter is 5～10mm leca.
A kind of structural thermal insulation lightweight aggregate concrete of the present invention, the unit weight grade of described haydite is 600.
A kind of structural thermal insulation lightweight aggregate concrete of the present invention, the haydite that described haydite is saturated dry surface.In actual mechanical process, the haydite of saturated dry surface is prepared by following method:
Haydite is prewetted after 24h and spread out on burlap, be placed on Indoor Natural air-dry to saturated dry surface.
A kind of structural thermal insulation lightweight aggregate concrete of the present invention, the particle diameter of described modified vitrification micro-bead is 0.5～1.5mm; Tap density is 130-140kg/m
3.
A kind of structural thermal insulation lightweight aggregate concrete of the present invention; described modified vitrification micro-bead; prepare by following proposal: by organosilicon moisture repellent and water organosilicon moisture repellent in mass ratio: water=1:50～100 mix and obtain hydrophober solution; then hydrophober solution and glass bead are evenly sprayed to glass bead surface for 1.1-1.2:1 in mass ratio; dry, obtain modified vitrification micro-bead.Described hydrophober is selected from the one in methyl siliconic acid salt hydrophober, silane and mixture of siloxanes class hydrophober, pure silicon alkanes hydrophober, and described methyl siliconic acid salt hydrophober is preferably sodium methyl silicate or potassium methyl silicate or methyl siliconic acid.
A kind of structural thermal insulation lightweight aggregate concrete of the present invention, described redispersible latex powder is selected from a kind of redispersible latex powder of Germany's watt gram (brand) product.Germany's watt gram redispersible latex powder that the preferred trade mark is RE-5044N or RE-5010N or RE-5011L is as redispersible latex powder of the present invention.
A kind of structural thermal insulation lightweight aggregate concrete of the present invention, the length of described anti-crack fiber is 3～8mm.Described anti-crack fiber is polypropylene fibre.
A kind of structural thermal insulation lightweight aggregate concrete of the present invention, described thickening material is a kind of hydroxypropyl methyl cellulose ether (trade mark is HPMC4000S) of Tao Shi cellulose ether product, its viscosity is 25000～45000mPas.
A kind of structural thermal insulation lightweight aggregate concrete of the present invention, described water reducer is high-efficiency water-reducing agent of poly-carboxylic acid.
A kind of structural thermal insulation lightweight aggregate concrete of the present invention, its preparation method is:
First will join after the haydite of getting prewets; dry; obtain after the haydite of saturated dry surface and join the modified vitrification micro-bead of getting and mix; then add wherein joining cement-based gelling material, the concrete modifying agent got; after mixing; add and join water and the water reducer got, stir, obtain structural thermal insulation lightweight aggregate concrete.
In actual application, adopt concrete mixer to mix; The time that prewet haydite after saturated and modified vitrification micro-bead are uniformly mixed is 30～60s, and adding the time that is uniformly mixed after cement-based gelling material, concrete modifying agent is 30～60s; Adding the time that is uniformly mixed after water and water reducer is 120～150s.
A kind of structural thermal insulation lightweight aggregate concrete of the present invention, obtains, after structural thermal insulation lightweight aggregate concrete, filling at twice mould, fill for the first time mould to 2/3 high place of mould, then manually plug and pound closely knitly, fill for the second time the paramount depanning of mould high, then with the plate vibrator 3～5s that vibrates; After vibrating, smear back and forth pressure, make haydite be wrapped in die trial and not float by sand-cement slurry; Obtain sample, then gained sample be 20 ± 5 DEG C of moulding 24 (please provide a scope) hour, after moulding, is that 20 ± 2 DEG C, relative humidity are maintenance 28d in more than 95% environment in temperature, obtains finished product.
The present invention adopts after above technology; glass bead grain pattern becomes finer and close; cement strength is improved; the optimization that is enhanced of concrete structure interface region; suppress interface region microfracture and further expanded, after the hydrophobic on simultaneously light fine aggregate surface is processed, the in the situation that of same workability; water cement ratio significantly declines, thus entirely gently the aggregate concrete strength of materials had obvious improvement to improve.Adopt the full lightweight concrete material thermal conductivity of this technology lower, between 0.25～0.4W/ (mK), intensity is higher, and between 8～15Mpa, thereby this material can be used as structural thermal insulation lightweight aggregate concrete for not only load-bearing but also the building enclosure that is incubated; This material unit weight is little simultaneously, is all less than or equal to 1200kg/m
3, alleviated dead load and then reduced construction costs.
Principle and advantage
The present invention mainly, taking haydite, glass bead as coarse-fine aggregate, carries out surface modification treatment to glass bead simultaneously, and then prepares the full lightweight concrete of superior performance.This product heat-insulating property is good, and intensity is higher, the full lightweight concrete strength of materials of preparing than haydite perlite is significantly improved, and the full lightweight concrete material thermal conductivity of preparing than ceramsite and ceramic sand decreases drastically, applicable to being used as structural thermal insulation lightweight aggregate concrete material.
The present invention's coal ash instead part of cement, has reduced the density difference of light skeletal and cement slurry, has improved to a certain extent cohesiveness, water-retentivity and the uniformity of full lightweight concrete.
The present invention has adopted unique concrete modifying agent, not only improve the viscosity of cement slurry, increase the parcel adhesive ability of cement matrix and light skeletal, concrete modifying agent also provides the rack that suppresses light skeletal floating simultaneously, prevent the laminated segregation phenomenon of full lightweight concrete, and then improved concrete performance.
The present invention is using modified vitrification micro-bead and haydite as aggregate; by rational component proportion; by the synergy of each component, having obtained thermal conductivity is that 0.25～0.4W/ (mK), 28 days ultimate compression strength are that 8～15Mpa, dry apparent density are 900-1200kg/m
3structural thermal insulation lightweight aggregate concrete.The concrete heat-insulating property of gained of the present invention is good, and intensity is higher, the full lightweight concrete strength of materials (being generally 2-3Mpa) of preparing than haydite perlite is significantly improved, the full lightweight concrete material thermal conductivity (being generally 0.4-0.8W/ (mK)) of preparing than ceramsite and ceramic sand decreases drastically, applicable to being used as structural thermal insulation lightweight aggregate concrete material.
The present invention is because modified vitrification micro-bead adds; make in same workability situation; water cement ratio significantly declines; so the aggregate concrete strength of materials has had significantly and has improved gently entirely; light fine aggregate glass bead after modification simultaneously, its surface is finer and close, and hydrophober can hinder the expansion of glass bead crackle at a kind of film of glass bead surface formation; improve the cylindrical compress strength of glass bead, because can further improve concrete strength.Due to adding of the haydite of saturated dry surface, make in full lightweight concrete maintenance processes, the haydite of saturated dry surface plays continual water supply maintenance action, thereby has improved the interfacial adhesion gathering materials with Behavior of Hardened Cement Paste, and then has improved the strength property of full lightweight concrete.Due to adding of concrete modifying agent, this not only can effectively improve the stability of lightweight aggregate concrete mixture, strengthen the water retention property of full lightweight concrete mixture, prevent that laminated segregation phenomenon from appearring in mixture, and improve interfacial transition zone intensity, improve and increased full lightweight concrete strength property, also improved concrete cracking resistance, anti-permeability performance simultaneously.
The present invention is by the synergy of each component in a word, makes it have lightweight, high-strength, insulation, economic characteristic, so structural thermal insulation lightweight aggregate concrete of the present invention can be widely used in the building enclosure of load-bearing in engineering construction, insulation.
Embodiment
In the embodiment of the present invention, haydite used is that particle diameter is 5～10mm, the leca that unit weight grade is 600.Preparing before concrete, haydite is prewetted after 24h and spread out on burlap, be placed on Indoor Natural air-dry to saturated dry surface.
In the embodiment of the present invention; modified vitrification micro-bead; prepare by following proposal: organosilicon moisture repellent in mass ratio: water=1:50～150; organosilicon moisture repellent is mixed with water and obtains hydrophober solution; then press the mass ratio 1.1-1.2:1 of hydrophober solution and glass bead; hydrophober solution is evenly sprayed to glass bead surface, dry, obtain modified vitrification micro-bead.The particle diameter of described glass bead is 0.5～1.5mm.Described hydrophober is selected from the one in organosilicon moisture repellent product.
In the embodiment of the present invention, concrete modifying agent by percentage to the quality, comprises dispersibility latex powder 93.46%-95.01%; Anti-crack fiber 4.75%-6.23%; Thickening material 0.16%-0.31%, redispersible latex powder is selected from a kind of redispersible latex powder of Germany's watt gram product; Anti-crack fiber is chemical polypropylene fibre, and length is 3～8mm; Thickening material is a kind of hydroxypropyl methyl cellulose ether of Tao Shi cellulose ether product.Its viscosity is 25000～45000mPas.
In the embodiment of the present invention, water reducer is high-efficiency water-reducing agent of poly-carboxylic acid, and its water-reducing rate is 20%～30%.
In the embodiment of the present invention, cement-based gelling material comprises by percentage to the quality, Xiangtan Power Plant I level flyash 10%～20%, ordinary Portland cement 80%～90%.
In the embodiment of the present invention, a kind of preparation method of structural thermal insulation lightweight aggregate concrete is:
By after the haydite of the join saturated dry surface of getting with join the modified vitrification micro-bead of getting and in concrete mixer, be uniformly mixed 30s; mix; then get cement-based gelling material, concrete modifying agent are added wherein will be joined; be uniformly mixed after 30s; add and join water and the water reducer got; stir 120s, obtain structural thermal insulation lightweight aggregate concrete.
In the embodiment of the present invention, a kind of method that takes shape in maintenance of structural thermal insulation lightweight aggregate concrete is: obtain after structural thermal insulation lightweight aggregate concrete, fill at twice mould, fill for the first time mould to 2/3 high place of mould, then manually plug and pound closely knit, fill for the second time the paramount depanning of mould high, then with the plate vibrator 3～5s that vibrates; After vibrating, smear back and forth pressure, make haydite be wrapped in die trial and not float by sand-cement slurry; Obtain sample, then gained sample is 20 ± 5 DEG C of moulding 24 hours, after moulding, is that 20 ± 2 DEG C, relative humidity are maintenance 28d in more than 95% environment in temperature, obtains finished product.
Embodiment 1
Join and get according to the mass fraction: 337 parts of 42.5 grades of ordinary Portland cements, 37 parts, flyash, 110 parts of modified vitrification micro-beads, 415 parts of lecas, 15.8 parts of concrete modifying agents, 3.74 parts of water reducers, 273 parts, water.In described concrete modifying agent, comprise by percentage to the quality: dispersibility latex powder 95.01%; The chemical polypropylene fibre 0.24% that 3～5mm is long; Thickening material 4.75%.Described water reducer is high-efficiency water-reducing agent of poly-carboxylic acid, and its water-reducing rate is 25%; According to the method preparation of above-mentioned preparation, moulding, maintenance, obtain finished product.Detect its performance, concrete detected value is in table 1.
Table 1: test item and the detected value of embodiment 1 finished product
| Project | Unit | Index test value |
| 28 days ultimate compression strength | Mpa | 10.5 |
| 28 cleavage strengths | Mpa | 1.24 |
| Dry apparent density | kg/m 3 | 1124 |
| Thermal conductivity | W/(m·K) | 0.322 |
Embodiment 2
Join and get according to the mass fraction: 375 parts of 42.5 grades of ordinary Portland cements, 42 parts, flyash, 113 parts of modified vitrification micro-beads, 447 parts of lecas, 17.9 parts of concrete modifying agents, 4.12 parts of water reducers, 260 parts, water.In described concrete modifying agent, comprise by percentage to the quality: dispersibility latex powder 94.16%; The chemical polypropylene fibre 0.19% that 3～8mm is long; Thickening material 5.65%.Described water reducer is high-efficiency water-reducing agent of poly-carboxylic acid, and its water-reducing rate is 25%; After making finished product, detect its performance, concrete detected value is in table 2.
Table 2: test item and the detected value of embodiment 2 finished products
| Project | Unit | Index test value |
| 28 days ultimate compression strength | Mpa | 11.6 |
| 28 cleavage strengths | Mpa | 1.53 |
| Dry apparent density | kg/m 3 | 1020 |
| Thermal conductivity | W/(m·K) | 0.268 |
Embodiment 3
Join and get according to the mass fraction: 409 parts of 42.5 grades of ordinary Portland cements, 45 parts, flyash, 120 parts of modified vitrification micro-beads, 430 parts of the haydites of saturated dry surface, 19.3 parts of concrete modifying agents, 4.54 parts of water reducers, 261 parts, water.In described concrete modifying agent, comprise by percentage to the quality: dispersibility latex powder 93.46%; The chemical polypropylene fibre 0.31% that 3～8mm is long; Thickening material 6.23%.Described water reducer is high-efficiency water-reducing agent of poly-carboxylic acid, and its water-reducing rate is 25%; After making finished product, detect its performance, concrete detected value is in table 3.
Table 3: test item and the detected value of embodiment 3 finished products
| Project | Unit | Index test value |
| 28 days ultimate compression strength | Mpa | 12.8 |
| 28 cleavage strengths | Mpa | 1.58 |
| Dry apparent density | kg/m 3 | 1090 |
| Thermal conductivity | W/(m·K) | 0.381 |
Comparative example 1
Comparative example 1 adopts without 110 parts of the glass beads of any processing, and the composition of other raw materials and proportioning and execution conditions and form of construction work are all in full accord with embodiment 1, obtains detecting its performance after finished product, and concrete detected value is in table 4.
Table 4: test item and the detected value of comparative example 1 finished product
Same proportioning and form of construction work as can be seen from Table 4, the full lightweight concrete intensity that the glass bead after modification is made is improved, and thermal conductivity and apparent density change little.The prepared full lightweight concrete of the present invention contrasts with the full lightweight concrete material that does not carry out hydrophobic processing, and its intensity is improved, and has maintained again its superior heat-insulating property.
Comparative example 2
In this comparative example, even embodiment 2 is in full accord for the composition of raw material and other conditions, has only changed the content of each component in raw material; According to the mass fraction, join and get 350 parts of cement-based gelling materials, wherein 297 parts of 42.5 grades of ordinary Portland cements, 53 parts, flyash; 402 parts of haydites; 97 parts of modified vitrification micro-beads; 246 parts, water; 3.5 parts of water reducers; Make finished product according to this proportioning, detect its its performance, concrete detected value is in table 5.
Table 5: test item and the detected value of comparative example 2 finished products
Each component proportioning is in the time that this patent is formulated beyond scope as can be seen from Table 5, and intensity does not obviously have embodiment 2 height, and thermal conductivity also has slightly and improve, and the strength of materials potentiality of each component are not in full use.It is optimum that full lightweight concrete material property does not reach.
Comparative example 3
In this comparative example, the content of each component in raw material and untreated glass bead are changed as light fine aggregate; Even embodiment 2 is in full accord for the composition of other raw materials and condition;
According to the mass fraction, join and get 509 parts of cement-based gelling materials, wherein 417 parts of 42.5 grades of ordinary Portland cements, 92 parts, flyash; 472 parts of haydites; 130 parts of glass beads; 21.1 parts of concrete modifying agents; 2 parts, water; 5 parts of water reducers; Make finished product according to this proportioning, detect its its performance, concrete detected value is in table 6.
Table 6: test item and the detected value of comparative example 3 finished products
When each component exceeds scope that this patent formulates and glass bead while not doing modification, intensity can reach the intensity with embodiment 2 as can be seen from Table 6, but dry apparent density and thermal conductivity are but improved largely, and also do not reach the optimal performance of material.
With reference to China's existing concrete material product technical indicator, draw the performance perameter of gas concrete and foamed concrete, concrete numerical value is in table 7;
Table 7: the performance perameter of gas concrete and foamed concrete
The full lightweight concrete material that the prepared full lightweight concrete material contrast of the present invention is not carried out hydrophobic processing as can be seen from Table 7, its intensity is improved, and has maintained again its superior heat-insulating property; Contrast lagging material that same thermal conductivity is low as gas concrete material, foamed concrete material, this material has again obvious superiority in intensity simultaneously.So the full lightweight concrete material after modification provided by the invention, also can be as the partition material of non bearing structure both applicable to covil construction load-bearing building enclosure.The full lightweight concrete of not processing described in table 7 refers to, other conditions are completely the same with the present invention, and only use is that the glass bead of hydrophobic processing has substituted modified vitrification micro-bead of the present invention.
Claims (10)
1. a structural thermal insulation lightweight aggregate concrete, its raw material comprises according to the mass fraction:
360～460 parts of cement-based gelling materials;
410～460 parts of haydites;
102～120 parts of modified vitrification micro-beads;
15～20 parts of concrete modifying agents;
260～290 parts, water;
3.6～4.6 parts of water reducers;
Described cement-based gelling material comprises by percentage to the quality, flyash 10%～20%, silicate cement 80%～90%;
Described modified vitrification micro-bead is the glass bead adopting after organosilicon moisture repellent modification;
Described concrete modifying agent comprises by percentage to the quality, dispersibility latex powder 93.46%-95.01%; Anti-crack fiber 4.75%-6.23%; Thickening material 0.16%-0.31%.
2. a kind of structural thermal insulation lightweight aggregate concrete according to claim 1, is characterized in that: described silicate cement is 42.5 grades of ordinary Portland cements; Described flyash is I level flyash.
3. a kind of structural thermal insulation lightweight aggregate concrete according to claim 1, is characterized in that: described haydite is that particle diameter is that 5～10mm, unit weight grade are the leca of 600 grades.
4. a kind of structural thermal insulation lightweight aggregate concrete according to claim 3, is characterized in that: the haydite that described haydite is saturated dry surface.
5. a kind of structural thermal insulation lightweight aggregate concrete according to claim 1, is characterized in that: the particle diameter of described modified vitrification micro-bead is 0.5～1.5mm; Tap density is 130-140kg/m
3.
6. a kind of structural thermal insulation lightweight aggregate concrete according to claim 5, is characterized in that described modified vitrification micro-bead is prepared by following proposal:
By organosilicon moisture repellent and water organosilicon moisture repellent in mass ratio: water=1:50～150 mix and obtain hydrophober solution; then hydrophober solution and glass bead evenly sprayed to glass bead surface for 1.0-1.2:1 in mass ratio; dry, obtain modified vitrification micro-bead.
7. a kind of structural thermal insulation lightweight aggregate concrete according to claim 1, is characterized in that: described dispersibility latex powder is Germany's watt gram redispersible latex powder, and its trade mark is RE-5044N or RE-5010N or RE-5011L; Described anti-crack fiber is that length is the polypropylene fibre of 3～8mm; Described thickening material is that viscosity is the hydroxypropyl methyl cellulose ether of 25000～45000mPas.
8. a kind of structural thermal insulation lightweight aggregate concrete according to claim 1, is characterized in that: described water reducer is that water-reducing rate is 20%～30% polycarboxylate water-reducer.
9. according to a kind of structural thermal insulation lightweight aggregate concrete described in claim 1-8 any one, its preparation method is:
First by join the haydite of getting prewet, air-dry; obtain after the haydite of saturated dry surface and join the modified vitrification micro-bead of getting and mix; then add wherein joining cement-based gelling material, the concrete modifying agent got; after mixing; add and join water and the water reducer got; stir, obtain structural thermal insulation lightweight aggregate concrete.
10. a kind of structural thermal insulation lightweight aggregate concrete according to claim 9, is characterized in that: it is that 0.25～0.4W/ (mK), 28 days ultimate compression strength are that 8～15Mpa, dry apparent density are 900-1200kg/m that structural thermal insulation lightweight aggregate concrete obtains thermal conductivity after moulding, maintenance
3finished product.
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