CN102206096B - Multi-phase combined lightweight aggregate concrete and preparation method thereof - Google Patents

Multi-phase combined lightweight aggregate concrete and preparation method thereof Download PDF

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Publication number
CN102206096B
CN102206096B CN2011100925028A CN201110092502A CN102206096B CN 102206096 B CN102206096 B CN 102206096B CN 2011100925028 A CN2011100925028 A CN 2011100925028A CN 201110092502 A CN201110092502 A CN 201110092502A CN 102206096 B CN102206096 B CN 102206096B
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China
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aggregate concrete
lightweight aggregate
phase combined
combined lightweight
granular polystyrene
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CN2011100925028A
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Chinese (zh)
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CN102206096A (en
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麻建锁
白润山
孙婧
卜娜蕊
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河北建筑工程学院
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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 discloses multi-phase combined lightweight aggregate concrete and a preparation method thereof. The multi-phase combined lightweight aggregate concrete is prepared from the following raw materials in part by weight: 1 part of cement, 0.40 to 0.50 part of fly ash, 1.836 to 2.219 parts of pumice sand, 0.028 to 0.043 part of corn straw fibers, 0.006 to 0.008 part of polyphenyl particles, 0.23 to 0.33 parts of rubber particles, 0.010 to 0.015 part of additive, 0.005 to 0.007 part of foaming agent, and 0.50 to 0.55 parts of water. The preparation method comprises the following steps: 1, preparing thin-coating pumice sand and thin-coating straw fibers; 2, performing interference treatment of polyphenyl particles and rubber particles; 3, uniformly stirring the cement, fly ash, water, additive and thin-coating pumice sand; and 4, adding the polyphenyl particles, rubber particles and thin-coating straw fibers in turn, and continuing to stir. When the method is used, the mechanical performance of the lightweight aggregate concrete can be improved effectively, the thermal-insulation and heat-preservation performance is enhanced, and production cost is lowered.

Description

Multi-phase combined lightweight aggregate concrete and preparation method thereof
Technical field
The present invention relates to a kind of light aggregate concrete and preparation method thereof.
Background technology
Light aggregate concrete with light-weight aggregate be mixed with, the light concrete of little what 1900 kg/ms of unit weight, also claim the porous aggregate light concrete.Owing to contain a large amount of blind holes crack in the light aggregate concrete, make it have the performances such as lightweight, thermal and insulating performance are good, easy construction, compare with the normal concrete with label, can alleviate deadweight more than 20~30%.Existing light aggregate concrete normally is prepared into foam with mechanical means with the foaming agent aqueous solution, foam is joined in the slip of compositions such as containing siliceous material, calcareous material, water and various admixtures again, forms through mix and blend, casting, maintenance.At present, lightweight material mainly adopts haydite, slag, float stone, pearlstone, polystyrene foam grain etc., but because above-mentioned raw materials output is little, skewness, the reasons such as strange land transportation cost height, so objectively the overall condition of China's lightweight material is not enough, causes the development of some regional light heat insulation materials to be restricted.Existing light aggregate concrete exists production cost high, the problem that production energy consumption is large.The mode that production technique generally adopts each raw material jointly to mix fails to consider the material self-characteristic, affects the quality of light aggregate concrete.
Existing light aggregate concrete fails to take full advantage of trade waste and natural materials aborning, and raw-material cost is high, production energy consumption is large.In Hebei, the huge float stone of regional reserves such as Shanxi, Inner Mongol and northeast, it is a kind of natural weight aggregate, the advantages such as that the concrete of making has is lightweight, good heat insulating, it is a kind of material that obvious energy saving effect is arranged, it is developed and utilized, not only be conducive to building structure and building energy conservation, also help and drive local Economic development and social employment.In addition, waste rubber has very strong heat resistanceheat resistant, antibiont, anti-mechanicalness, but is difficult to degraded, and decades even upper a century can be owing to natural force disappears.And that polystyrene has is anti-aging, the characteristics such as protection against corrosion, thus not perishable at occurring in nature, also be difficult for being degraded by microorganisms, even if buried, also can the polluted underground water source, the spoiled soil structure makes the food crop underproduction.All do simple burning disposal such as both, then again can severe contamination air and atmospheric environment.Waste rubber and waste polystyrene foam plastic are recycled, it is become the green resource of field of civil engineering by environmental hazard, but both environmental contamination reductions can be turned waste into wealth again save energy.In addition, the stalk resource owning amount of China ranks first in the world, and tradition reduces the demand of straw as life fuel year by year, has caused the problem of residue Straw treatment difficulty very outstanding.As maize straw and float stone, granular polystyrene and waste rubber grain are combined, can produce a kind of novel composite energy-saving building materials.
When mixing concrete processed, if maize straw, float stone are directly prepared as lightweight material, because maize straw, float stone rough and have exposed open hole, larger to mixing water, grout absorbed dose, thereby make its concrete mix workability relatively poor, and cement consumption is larger than normal concrete; Owing to sucked more grout in the hole, increase concrete density simultaneously, reduced the heat preservation and soundproof performance.In addition, because maize straw and two kinds of raw-material density of float stone, morphological differences are larger, can not adopt mixing of normal concrete to make shape technique, otherwise it is inhomogeneous to produce easily the inside concrete distribution of each phase, the phenomenon of layering occurs, thereby affect its performance.And rubber grain, granular polystyrene belongs to organic materials, all is hydrophobic nature, mixes with the cement slurry of inorganic gel system, is difficult for wetting affinity between the two, causes fresh paste cohesion variation, can not directly prepare as lightweight material.On the other hand, granular polystyrene of different nature, rubber grain, float stone particle are mixed use altogether, if the grain diameter grating is unreasonable, will inevitably affect its concrete mix workability, and the mechanical property of hardenite and other physicalies.Therefore must the grain diameter grating carry out appropriate design.In addition, because granular polystyrene-rubber grain-pumice concrete has related to the use of multiple lightweight material, and three kinds of raw-material density, morphological differences are larger, can not adopt mixing of normal concrete to make shape technique, otherwise it is inhomogeneous to produce easily the inside concrete distribution of each phase, the phenomenon of easy layering, thus its performance affected.
Summary of the invention
The invention provides a kind of multi-phase combined lightweight aggregate concrete and preparation method thereof, solve the problem that existing light aggregate concrete material cost is high, production energy consumption is large; And solve lightweight material and concrete workability poor, the density of light aggregate concrete is large, thermal conductivity is high, the technical problem that heat insulating effect is bad; Also solve preparation method's easy layering of inside concrete when mixing of common light aggregate concrete, affect the technical problem of product performance.
The technical solution adopted for the present invention to solve the technical problems is:
This multi-phase combined lightweight aggregate concrete, described its raw material is as follows by weight ratio:
1 part of cement;
0.40~0.50 part in flyash;
1.836~2.219 parts of pumice sands;
0.028~0.043 part of corn stalk fiber;
0.006~0.008 part of granular polystyrene;
0.23~0.33 part of rubber grain;
0.010~0.015 part of admixture;
0.005~0.007 part of whipping agent;
0.50~0.55 part in water.
Described granular polystyrene and rubber grain all are granular polystyrene and rubber grains of processing through interface treating agent, and interface treating agent is that a kind of the dilution with sodium silicate aqueous solution wherein of silane coupling agent, titanate coupling agent or chromium complex coupling agent forms.
The length 1mm of described corn stalk fiber~10mm, wide less than 2mm.
The particle diameter of described pumice sand is 2~6mm.
The particle diameter of described granular polystyrene is 4~7mm.
The particle diameter of described rubber grain is 16~20 orders.
Described admixture is one or more the mixture in high efficiency water reducing agent, hardening accelerator, the frostproofer.
The raw material of described multi-phase combined lightweight aggregate concrete by weight best proportioning is as follows:
1 part of cement;
0.43 part in flyash;
2.028 parts of pumice sands;
0.038 part of corn stalk fiber;
0.007 part of granular polystyrene;
0.280 part of rubber grain;
0.010~0.015 part of admixture;
0.005~0.007 part of whipping agent;
0.50~0.55 part in water.
The preparation method of this multi-phase combined lightweight aggregate concrete, step is as follows:
Step 1, Preparative TLC wrap up in the shell pumice sand and thin layer is wrapped up in the shell stalk fibre, prewets with sodium silicate aqueous solution spray pumice sand and corn stalk fiber first; Respectively the pumice sand of prewetting and corn stalk fiber are dropped into again in the cement that mixes, the flyash slurry and stir, make pumice sand and corn stalk fiber surface uniform be surrounded by one deck shell; Obtain after 24 hours finally by natural curing that thin layer is wrapped up in the shell pumice sand and thin layer is wrapped up in the shell stalk fibre;
Step 2, granular polystyrene and rubber grain are carried out interface processing, taking by weighing interface treating agent in the ratio of 160~250g/L adds in the sodium silicate aqueous solution and dilutes, then the interface treating agent after will diluting is slowly poured in the container that fills granular polystyrene and rubber grain, the limit bevelling stirs, until granular polystyrene and rubber grain can Uniform Dispersion, the surface have even slick to distribute and granular polystyrene outer because of the electrostatic repulsion overflow container, leave standstill after 10 minutes for subsequent use;
Step 3 is wrapped up in the shell pumice sand by proportioning with cement, flyash, water, admixture and the thin layer for preparing and is dropped in the stirrer and stir;
Step 4 drops into continuation stirring in the stirrer with the granular polystyrene after the interface processing and rubber grain;
Step 5 is wrapped up in the shell stalk fibre with thin layer and is dropped into continuation stirring in the stirrer;
Step 6 is poured above-mentioned stirring thing into after whipping agent got blisters, and makes multi-phase combined lightweight aggregate concrete after stirring.
The consumption of cement, flyash and water is 1: 2: 0.5 in the cement of described step 1, the flyash slurry.
Beneficial effect of the present invention is as follows:
The present invention adopts thin layer to wrap up in the shell pumice sand, thin layer is wrapped up in shell stalk fibre, granular polystyrene and rubber grain as lightweight material.Because the raw materials pumice sand is good from heavy and light, shock resistance, be added in the concrete and can reduce light aggregate concrete density, improve the heat-insulating property of light aggregate concrete, not only be conducive to the development and use to float stone, also help and drive local Economic development and social employment.Also adopt simultaneously corn stalk fiber as lightweight material, maize straw is with netted high purity SiO 2Be skeleton, wrap up again the Mierocrystalline cellulose of one deck densification.Therefore large, lightweight, the good heat insulating of maize straw porosity, corrosion resistance are strong.It not only has extraordinary toughness, but also has certain intensity.For the production of in the cement based stalk building material product, both can play the effect of certain anti-shrinkage strain to stalk, can alleviate again the quality of matrix material, and make it have sound insulation, heat-proof quality, can also solve the processing problem of stalk simultaneously, increase peasant's income.Also waste polystyrene foam, rubber item being processed into simultaneously various varigrained particles mixes in the concrete, because both all have the preferably characteristics such as toughness, impermeability, antifatigue, space in can fill concrete, generation and the development of microfracture in the constraint, can improve concrete shock resistance and anti-seismic performance, also can effectively alleviate concrete weight, play the effect of heat insulating, sound insulation.In addition, waste rubber, polystyrene all have the characteristics such as very strong antibiont, anti-aging, non-corrosibility, so not perishable at occurring in nature, also be difficult for being degraded by microorganisms, even if buried, also can the polluted underground water source, the spoiled soil structure makes the food crop underproduction.In addition, waste rubber and waste polystyrene foam plastic are recycled, it is become the green resource of field of civil engineering by environmental hazard, but both environmental contamination reductions can be turned waste into wealth again save energy.
The present invention is before mixing concrete processed, first maize straw, pumice sand are wrapped pre-treatment, with the sodium silicate aqueous solution for preparing uniformly spray stir while spray to pumice sand and two kinds of starting material surfaces of corn stalk fiber, guarantee raw-material even wetting and have certain humidity.Wrap pre-treatment ground method and overcome corn stalk fiber, the many easily shortcomings of suction in pumice sand particle hole.Thin layer is wrapped up in shell and has effectively been sealed maize straw and two kinds of raw-material surperficial apertures of pumice sand, and improve its surfaceness, again during the mix concrete, can improve well concrete workability, and minimizing cement consumption, particularly stoped a large amount of grouts to be inhaled into hole, thereby alleviated concrete density, reduced its thermal conductivity and improved the heat preservation and soundproof performance.
In order to improve the cohesive force between rubber grain, granular polystyrene and the cement slurry, make it and cement between form comparatively closely bonding.The present invention had carried out the interface pre-treatment to rubber grain, granular polystyrene before mixing concrete processed.Rubber grain after the interface processing, granular polystyrene can be good at being bonded by grout, make to form comparatively closely cohesive force between itself and the cement, have greatly reduced the hole in the hardened paste, have improved the intensity of hardenite.Reasonably grain composition makes respectively evenly distributing mutually of multi-phase combined lightweight aggregate concrete with specific preparation technology, has effectively improved its mechanical property, and has reduced concrete density, has improved its thermal and insulating performance.On the other hand, with starting material carry out break process, the pumice sand grain diameter is controlled at 2-6mm, the granular polystyrene particle diameter is controlled at 4-7mm, rubber adopts the particle of 18 orders (mean particle size is 995 μ m), thereby makes concrete workability, mechanical property better.
When mixing concrete processed at last, in order to make each mutually evenly distribution of multi-phase combined lightweight aggregate concrete, the present invention has formulated specific preparation technology.Cement, flyash, suitable quantity of water and the thin layer handled well are wrapped up in the shell pumice sand to stir in stirrer; Next adds rubber grain after the interface processing, granular polystyrene and an amount of admixture, and mix is even again; And then the thin layer that adds after processing is wrapped up in shell stalk continuation stirring; Pouring concrete into after at last whipping agent being got blisters is prepared from.This preparation technology is sequentially added into starting material, can make each mutually evenly distribution of multi-phase combined lightweight aggregate concrete, has effectively improved its mechanical property, and has reduced concrete density, has improved its thermal and insulating performance.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is preparation technology's schema that thin layer is wrapped up in the shell pumice sand.
Fig. 2 is preparation technology's schema that thin layer is wrapped up in the shell stalk fibre.
Fig. 3 is preparation technology's schema of multi-phase combined lightweight aggregate concrete.
Embodiment
Embodiment one, this multi-phase combined lightweight aggregate concrete, and described its raw material is as follows by weight ratio:
1 part of cement;
0.43 part in flyash;
2.028 parts of pumice sands;
0.038 part of corn stalk fiber;
0.007 part of granular polystyrene;
0.280 part of rubber grain;
0.015 part of admixture;
0.006 part of whipping agent;
0.53 part in water.
Described pumice sand and corn stalk fiber are processed into respectively thin layer and wrap up in and use after shell pumice sand and thin layer are wrapped up in the shell stalk fibre, granular polystyrene and rubber grain all are granular polystyrene and rubber grains of processing through interface treating agent, and interface treating agent is that silane coupling agent forms with the sodium silicate aqueous solution dilution.
Embodiment two, this multi-phase combined lightweight aggregate concrete, and described its raw material is as follows by weight ratio:
1 part of cement;
0.42 part in flyash;
2.219 parts of pumice sands;
0.043 part of corn stalk fiber;
0.006 part of granular polystyrene;
0.23 part of rubber grain;
0.012 part of admixture;
0.007 part of whipping agent;
0.55 part in water.
Described pumice sand and corn stalk fiber are processed into respectively thin layer and wrap up in and use after shell pumice sand and thin layer are wrapped up in the shell stalk fibre, granular polystyrene and rubber grain all are granular polystyrene and rubber grains of processing through interface treating agent, and interface treating agent is that silane coupling agent forms with the sodium silicate aqueous solution dilution.
Embodiment three, this multi-phase combined lightweight aggregate concrete, and described its raw material is as follows by weight ratio:
1 part of cement;
0.50 part in flyash;
1.836 parts of pumice sands;
0.028 part of corn stalk fiber;
0.008 part of granular polystyrene;
0.33 part of rubber grain;
0.010 part of admixture;
0.005 part of whipping agent;
0.55 part in water.
Described pumice sand and corn stalk fiber are processed into respectively thin layer and wrap up in and use after shell pumice sand and thin layer are wrapped up in the shell stalk fibre, granular polystyrene and rubber grain all are granular polystyrene and rubber grains of processing through interface treating agent, and interface treating agent is that titanate coupling agent forms with the sodium silicate aqueous solution dilution.
Embodiment four, this multi-phase combined lightweight aggregate concrete, and described its raw material is as follows by weight ratio:
1 part of cement;
0.40 part in flyash;
2.106 parts of pumice sands;
0.041 part of corn stalk fiber;
0.007 part of granular polystyrene;
0.30 part of rubber grain;
0.015 part of admixture;
0.007 part of whipping agent;
0.54 part in water.
Described pumice sand and corn stalk fiber are processed into respectively thin layer and wrap up in and use after shell pumice sand and thin layer are wrapped up in the shell stalk fibre, granular polystyrene and rubber grain all are granular polystyrene and rubber grains of processing through interface treating agent, and interface treating agent is that silane coupling agent forms with the sodium silicate aqueous solution dilution.
In above-described embodiment one to four, the length 1mm of described corn stalk fiber~10mm, wide less than 2mm.The particle diameter of pumice sand is 2~6mm.The particle diameter of granular polystyrene is 4~7mm.The particle diameter of rubber grain is 16~20 orders.Admixture is one or more the mixture in high efficiency water reducing agent, hardening accelerator, the frostproofer.
Shown in Fig. 1-3, the preparation method of this multi-phase combined lightweight aggregate concrete, step is as follows:
Step 1, Preparative TLC wrap up in the shell pumice sand and thin layer is wrapped up in the shell stalk fibre, prewets with sodium silicate aqueous solution spray pumice sand and stalk fibre first; Respectively the pumice sand of prewetting and corn stalk fiber are dropped into again in the cement that mixes, the flyash slurry and stir, make pumice sand and corn stalk fiber surface uniform be surrounded by one deck shell; Obtain after 24 hours finally by natural curing that thin layer is wrapped up in the shell pumice sand and thin layer is wrapped up in the shell stalk fibre;
Step 2, granular polystyrene and rubber grain are carried out interface processing, taking by weighing interface treating agent in the ratio of 160~250g/L adds in the sodium silicate aqueous solution and dilutes, then the interface treating agent after will diluting is slowly poured in the container that fills granular polystyrene and rubber grain, the limit bevelling stirs, until granular polystyrene and rubber grain can Uniform Dispersion, the surface have even slick to distribute and granular polystyrene outer because of the electrostatic repulsion overflow container, leave standstill after 10 minutes for subsequent use;
Step 3 is wrapped up in the shell pumice sand by proportioning with cement, flyash, water, admixture and the thin layer for preparing and is dropped in the stirrer and stir;
Step 4 drops into continuation stirring in the stirrer with the granular polystyrene after the interface processing and rubber grain;
Step 5 is wrapped up in the shell stalk fibre with thin layer and is dropped into continuation stirring in the stirrer;
Step 6 is poured above-mentioned stirring thing into after whipping agent got blisters, and makes multi-phase combined lightweight aggregate concrete after stirring.
The consumption of cement, flyash and water is 1: 2: 0.5 in the cement of described step 1, the flyash slurry.

Claims (10)

1. multi-phase combined lightweight aggregate concrete, it is characterized in that: the raw material of described multi-phase combined lightweight aggregate concrete is as follows by weight ratio:
2. multi-phase combined lightweight aggregate concrete according to claim 1, it is characterized in that: described granular polystyrene and rubber grain all are granular polystyrene and rubber grains of processing through interface treating agent, and interface treating agent is that a kind of the dilution with sodium silicate aqueous solution wherein of silane coupling agent, titanate coupling agent or chromium complex coupling agent forms.
3. multi-phase combined lightweight aggregate concrete according to claim 1 is characterized in that: the length 1mm of described corn stalk fiber~10mm, and wide less than 2mm.
4. multi-phase combined lightweight aggregate concrete according to claim 1, it is characterized in that: the particle diameter of described pumice sand is 2~6mm.
5. multi-phase combined lightweight aggregate concrete according to claim 1, it is characterized in that: the particle diameter of described granular polystyrene is 4~7mm.
6. multi-phase combined lightweight aggregate concrete according to claim 1, it is characterized in that: the particle diameter of described rubber grain is 16~20 orders.
7. multi-phase combined lightweight aggregate concrete according to claim 1 is characterized in that: described admixture is one or more the mixture in high efficiency water reducing agent, hardening accelerator, the frostproofer.
8. multi-phase combined lightweight aggregate concrete according to claim 1, it is characterized in that: the raw material of described multi-phase combined lightweight aggregate concrete by weight best proportioning is as follows:
9. preparation method such as multi-phase combined lightweight aggregate concrete as described in claim 1~8 any one is characterized in that step is as follows:
Step 1, Preparative TLC wrap up in the shell pumice sand and thin layer is wrapped up in the shell stalk fibre, prewets with sodium silicate aqueous solution spray pumice sand and corn stalk fiber first; Respectively the pumice sand of prewetting and corn stalk fiber are dropped into again in the cement that mixes, the flyash slurry and stir, make pumice sand and corn stalk fiber surface uniform be surrounded by one deck shell; Obtain after 24 hours finally by natural curing that thin layer is wrapped up in the shell pumice sand and thin layer is wrapped up in the shell stalk fibre;
Step 2, granular polystyrene and rubber grain are carried out interface processing, taking by weighing interface treating agent in the ratio of 160~250g/L adds in the sodium silicate aqueous solution and dilutes, then the interface treating agent after will diluting is slowly poured in the container that fills granular polystyrene and rubber grain, the limit bevelling stirs, until granular polystyrene and rubber grain can Uniform Dispersion, the surface have even slick to distribute and granular polystyrene outer because of the electrostatic repulsion overflow container, leave standstill after 10 minutes for subsequent use;
Step 3 is wrapped up in the shell pumice sand by proportioning with cement, flyash, water, admixture and the thin layer for preparing and is dropped in the stirrer and stir;
Step 4 drops into continuation stirring in the stirrer with the granular polystyrene after the interface processing and rubber grain;
Step 5 is wrapped up in the shell stalk fibre with thin layer and is dropped into continuation stirring in the stirrer;
Step 6 is poured above-mentioned stirring thing into after whipping agent got blisters, and makes multi-phase combined lightweight aggregate concrete after stirring.
10. the preparation method of multi-phase combined lightweight aggregate concrete according to claim 9, it is characterized in that: the consumption of cement, flyash and water is 1: 2: 0.5 in the cement of described step 1, the flyash slurry.
CN2011100925028A 2011-04-13 2011-04-13 Multi-phase combined lightweight aggregate concrete and preparation method thereof CN102206096B (en)

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