CN114956712B - LC40 full-light pumping ceramsite concrete and preparation method thereof - Google Patents

LC40 full-light pumping ceramsite concrete and preparation method thereof Download PDF

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CN114956712B
CN114956712B CN202210325102.5A CN202210325102A CN114956712B CN 114956712 B CN114956712 B CN 114956712B CN 202210325102 A CN202210325102 A CN 202210325102A CN 114956712 B CN114956712 B CN 114956712B
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ceramsite
concrete
viscosity
retaining agent
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CN114956712A (en
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狄立榆
徐宏刚
蒙飞
杨小敏
朱延斌
朱玲
王珂
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Shaanxi Construction Engineering Group Concrete Co ltd
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Shaanxi Construction Engineering Group Concrete Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24—Macromolecular compounds
    • C04B24/243—Phosphorus-containing polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F230/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal
    • C08F230/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal containing phosphorus
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
    • C04B2103/308—Slump-loss preventing agents
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
    • C04B2103/34—Flow improvers
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00034—Physico-chemical characteristics of the mixtures
    • C04B2111/00146—Sprayable or pumpable mixtures
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/40—Porous or lightweight materials
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The application relates to the technical field of building materials, and particularly discloses LC40 all-light pumping ceramsite concrete and a preparation method thereof, wherein the LC40 all-light pumping ceramsite concrete comprises the following raw materials in parts by weight: 420-500 parts of a cementing material; 160-180 parts of mixing water; 800-840 parts of pottery sand; 500-540 parts of ceramsite; 1-5 parts of viscosity-reducing slump-retaining agent. The method has the advantage of reducing the cohesiveness of the light concrete on the basis of ensuring the mechanical property of the light concrete.

Description

LC40 all-light pumping ceramsite concrete and preparation method thereof
Technical Field
The invention relates to the technical field of building materials, in particular to LC40 full-light pumping ceramsite concrete and a preparation method thereof.
Background
Concrete is used as the most widely applied material in the building field, and is most widely applied in the industrial and civil building fields. Ordinary concrete is usually prepared by using cement, sand, stone and water as raw materials, but the ordinary concrete cannot meet the use requirements under some special working conditions due to the fact that the ordinary concrete is heavy in weight and poor in heat insulation performance. Compared with common concrete, the density of the lightweight concrete is reduced by 20-45%, and the lightweight concrete has good heat-insulating and fire-resisting properties, so that the lightweight concrete has wide application prospect.
The lightweight aggregate commonly used in the lightweight concrete at present is ceramsite which has the characteristics of light weight, low manufacturing cost, rich preparation raw materials, short production period and the like.
In the actual use process, firstly, the ceramsite has strong water absorption, and water in cement paste is easy to permeate into the ceramsite under the action of pumping pressure in the pumping process, so that the water consumption participating in cement hydration is reduced, the workability of light ceramsite concrete is reduced, the working performance of the light ceramsite concrete is influenced, the cohesiveness of the light ceramsite concrete is improved, the pumping of the light concrete is not facilitated, and the construction difficulty is improved; secondly, after the ceramsite is added into the concrete, the strength of the ceramsite is lower than that of stone and natural sand, and the strength improvement of the lightweight ceramsite concrete is limited to a certain extent.
Disclosure of Invention
In order to reduce the cohesiveness of the all-light concrete on the basis of ensuring the mechanical property of the all-light concrete, the application provides LC40 all-light pumping ceramsite concrete and a preparation method thereof.
In a first aspect, the application provides an LC40 all-light pumping ceramsite concrete, which adopts the following technical scheme: the LC40 all-light pumping ceramsite concrete is prepared from the following raw materials in parts by weight:
420-500 parts of a cementing material;
160-180 parts of mixing water;
800-840 parts of pottery sand;
500-540 parts of ceramsite;
1-5 parts of viscosity-reducing slump-retaining agent.
By adopting the technical scheme, as the ceramic sand and the ceramic aggregate are adopted to completely replace the coarse aggregate and the fine aggregate required by the preparation of the concrete, and the raw materials for preparing the ceramic sand and the ceramic aggregate have wide sources, the artificial ceramic aggregate and the artificial ceramic sand can be manufactured by utilizing industrial waste and domestic garbage, the requirement of the preparation of the concrete on natural sand stones is reduced, and the damage of the excavated sand stones on the environment is reduced; in addition, the dead weight of the all-light concrete is greatly reduced, and the application range of the concrete in special fields, such as super high-rise civil buildings, high-speed railways, urban high-rise and other large-scale engineering construction, is widened;
under the action of the viscosity-reducing slump-retaining agent, the viscosity of concrete is reduced, and the probability that the mechanical property of the concrete is reduced due to insufficient hydration of the concrete caused by the fact that the ceramsite and the ceramic sand absorb mixing water in the concrete is reduced, so that the viscosity of the all-light concrete is reduced on the basis of ensuring the strength of the concrete, the working performance of the concrete is improved, and construction operation is facilitated.
Optionally, the viscosity-reducing slump-retaining agent is prepared from the following raw materials in parts by weight:
90-105 parts of long-chain alcohol;
5-10 parts of quaternary ammonium base;
3-6 parts of p-xylene;
10-15 parts of propylene oxide;
5-10 parts of styrene;
5-15 parts of hydroxyethyl methacrylate phosphate;
2-8 parts of methyl methacrylate;
and a proper amount of water.
In the application, "a proper amount of water" means a degree of stirring the above materials uniformly.
By adopting the technical scheme, compared with the traditional additive, the viscosity-reducing slump-retaining agent prepared by the preparation method has higher surface activity, plays a role in delaying cement hydration, releasing free water in the ready-mixed concrete slurry and the like, and further reduces the cohesiveness of the ready-mixed light concrete slurry.
Optionally, the viscosity-reducing slump-retaining agent is prepared by the following steps: the long-chain alcohol is phosphorylated and then reacts with quaternary ammonium hydroxide, a product obtained after p-xylene is introduced is subjected to acidification treatment again to obtain a product with a gemini structure, the product with the gemini structure is mixed with propylene oxide, styrene and water and then heated to obtain a heated solution, hydroxyethyl methacrylate phosphate and methyl methacrylate are added into the obtained mixed solution, a reaction product is obtained after reaction for a period of time, the reaction product is cooled to room temperature, the pH value of the reaction product is adjusted, and the viscosity-reducing slump-retaining agent with the solid content of 35% -45% is obtained.
By adopting the technical scheme, the viscosity-reducing slump-retaining agent is of a gemini structure, the gemini structure consists of two hydrophobic chains and a linking group for connecting the two hydrophobic chains, partial epoxypropane and styrene are introduced into the hydrophobic chains, and methyl groups in the styrene and the epoxypropane are grafted to the hydrophobic chains of the gemini structure, so that the hydrophobic property and the surface activity of molecules of the viscosity-reducing slump-retaining agent are enhanced, and the fluidity of concrete is further improved; the epoxy propane can enhance the foam stabilizing capacity of the styrene lifting viscous slump retaining agent, has very obvious effect on micro bubbles, and the micro bubbles in the concrete ready-mixed slurry can play a role in ball lubrication, so that the viscosity of the concrete ready-mixed slurry is reduced; after the phosphate groups in the hydroxyethyl methacrylate phosphate are grafted to the hydrophobic chains, a compact phosphate thin layer can be formed on the surface of the ready-mixed concrete slurry, and the entry of water molecules is inhibited, so that the hydration of the ready-mixed concrete slurry is hindered, the free water content in the concrete ready-mixed slurry is increased, and the flowability of the ready-mixed concrete is improved; the hydrophilic-lipophilic balance value of the viscosity-reducing slump retaining agent molecules can be improved after the hydrophobic group-methyl group contained in the methyl methacrylate is grafted to the hydrophobic chain, and the addition of the epoxypropane and the styrene can promote the methyl methacrylate to release free water bound by the side chain, so that the free water in the concrete ready-mixed slurry body is increased, and the concrete viscosity is reduced.
Optionally, in the step of preparing the viscosity and slump retaining agent, the heating temperature is 50-80 ℃, the heating time is 5-20min, the reaction time is 4-6h, and the viscosity and slump retaining agent is obtained by adjusting the pH value of the reaction product to 6-7.
By adopting the technical scheme and setting the temperature and the reaction time, all the preparation raw materials are fully reacted to obtain the viscosity-reducing slump-retaining agent with excellent properties.
Optionally, the long-chain alcohol is any one of tridecanol, hexadecanol and octadecanol.
By adopting the technical scheme, the long-chain alcohol raw material for preparing the viscosity-reducing slump retaining agent is easy to obtain, and the industrial production is convenient to carry out.
Optionally, the ceramsite is crushed stone type shale ceramsite continuously graded by 5mm-20mm, and the material of the ceramic sand is the same as that of the ceramsite.
By adopting the technical scheme, the shapes of the ceramsite and the ceramic sand have different influences on the mechanical property of the concrete, wherein the broken stone type shale ceramsite and the broken stone type shale ceramic sand have the highest contribution degree on the mechanical property of the concrete, so that the good mechanical property of the all-light concrete is ensured.
Optionally, the bulk density of the ceramsite is 700-900kg/m 3 The water absorption rate is not more than 4% in 1 hour, 6% -8% in 2 hours and the cylinder pressure strength is 8-12Mpa; the pottery sand is medium sand, and the stacking density of the pottery sand is 1500-1600kg/m 3 。
By adopting the technical scheme, the good mechanical property of the all-light concrete is further ensured by reasonably selecting the ceramsite and the ceramic sand.
Optionally, on the basis of the cementing material, the cementing material comprises 320-360 parts of cement; 100-140 parts of fly ash.
By adopting the technical scheme, firstly, the fly ash is spherical particles with smooth surfaces, plays a roll ball effect after being doped into ceramsite concrete, plays a roll ball lubricating role, plays a water reducing role on the basis of not changing the water consumption of concrete mixture, and thus improves the workability of the all-light concrete mixture; "pozzolanic effect", secondly, the chemically active component SiO in fly ash 2 And Al 2 O 3 Will react with the cement hydration product Ca (OH) 2 Reacting to generate reaction products such as calcium silicate hydrate and calcium aluminate hydrate, which are similar to those generated by cement hydration, wherein the products, as a part of the cementing material, have a reinforcing effect on the strength of the all-light concrete; finally, the fly ash particles are uniformly distributed in the cement paste to fill pores and capillary holes, so that the pore structure of the all-light concrete is improved, the compactness is increased, and the later strength of the all-light concrete is further improved.
In a second aspect, the application provides a preparation method of LC40 full-light pumping ceramsite concrete, which adopts the following technical scheme:
a preparation method of LC40 all-light pumping ceramsite concrete comprises the following steps:
mixing water and a slump retaining agent, and uniformly stirring to obtain a first mixture;
step two, uniformly stirring the cement and the fly ash, mixing the mixture with the first mixture, and uniformly stirring to obtain a second mixture;
and step three, performing saturated pre-wetting treatment on the ceramsite and the ceramic sand, and then uniformly stirring the mixture and the second mixture to prepare the LC40 full-light pumping ceramsite concrete.
By adopting the technical scheme, the raw materials are mixed in batches and fully mixed, so that the raw materials are fully matched for use and play a role, and the LC40 full-light pumping ceramsite concrete is prepared.
In summary, the present application has the following beneficial effects:
in the application, long-chain alcohol, quaternary ammonium hydroxide, polymethylene, epoxypropane, hydroxyethyl methacrylate phosphate, methyl methacrylate and styrene are preferably adopted to be matched for use, so that the viscosity-reducing slump retaining agent with a gemini structure is prepared, and compared with the traditional viscosity reduction, the surface energy is effectively reduced, the surface activity is improved, and the viscosity-reducing effect on concrete is further improved; after the propylene oxide and the styrene are used, the hydrophilic and oleophilic values of the viscosity-reducing slump-retaining agent can be adjusted, so that the hydrophobic property of molecules is enhanced, and the fluidity of concrete is improved; in addition, the epoxypropane can enhance the foam stabilizing capability of the styrene lifting viscosity slump retaining agent, and micro bubbles in the concrete ready-mixed slurry can play a role in ball lubrication, so that the viscosity of the concrete ready-mixed slurry is further reduced; and finally, the propylene oxide and the styrene promote the methyl methacrylate to release free water bound by side chains, so that the free water in the concrete ready-mixed slurry body becomes more, the cement hydration reaction is promoted to a certain extent to be fully performed, and the mechanical property of the concrete is further ensured not to be influenced by the negative effect of the viscosity reducing slump retaining agent, so that the viscosity of the light concrete is reduced on the basis of not influencing the mechanical strength of the light concrete by the viscosity reducing slump retaining agent, and the working performance of the light concrete is further improved.
Detailed Description
The present application will be described in further detail with reference to examples.
Preparation examples of raw materials
Acid used in the phosphorylation treatment in the preparation process of the viscosity-reducing slump-retaining agent is pyrophosphoric acid; the reagent used for adjusting the pH value of the reaction product is 0.1mol/L sodium hydroxide solution.
Preparation example 1
A preparation method of a viscosity-reducing slump-retaining agent comprises the following steps: dissolving 9.8kg of octadecanol and 2kg of pyrophosphoric acid in ethanol (the amount of ethanol is enough to dissolve the long-chain alcohol and the pyrophosphoric acid), carrying out phosphorylation treatment on the long-chain alcohol by the pyrophosphoric acid, reacting for 1h at room temperature, adding 0.75kg of quaternary ammonium hydroxide and 0.5kg of p-xylene, adding 1kg of pyrophosphoric acid again for acidification treatment, drying for 6h at 40 ℃ to obtain a product with a gemini structure, mixing the product with 1.2kg of propylene oxide, 0.75kg of styrene and water, heating for 15min at 65 ℃ to obtain a heating solution, adding 1kg of hydroxyethyl methacrylate phosphate and 0.5kg of methyl methacrylate into the heating solution under the condition of keeping the temperature of the heating solution unchanged, reacting for 5h to obtain a reaction product, and adjusting the pH value of the reaction product to 6.5 to obtain the viscosity reducing and slump retaining agent.
Preparation example 2
A preparation method of a viscosity-reducing slump-retaining agent comprises the following steps: taking 9kg of octadecanol and 2kg of pyrophosphoric acid, dissolving in ethanol (the amount of ethanol is enough to dissolve the long-chain alcohol and the pyrophosphoric acid), carrying out phosphorylation treatment on the long-chain alcohol by the pyrophosphoric acid, reacting for 1h at room temperature, adding 0.5kg of quaternary ammonium hydroxide and 0.3kg of p-xylene, adding 1kg of pyrophosphoric acid again for acidification treatment, drying for 6h at 40 ℃ to obtain a product with a gemini structure, mixing the product with the gemini structure, 1kg of propylene oxide, 0.5kg of styrene and water, heating for 50min at 50 ℃ to obtain a heating solution, adding 0.5kg of hydroxyethyl methacrylate phosphate and 0.2kg of methyl methacrylate into the heating solution under the condition of keeping the temperature of the heating solution unchanged, reacting for 4h to obtain a reaction product, and adjusting the pH value of the reaction product to be 6 to obtain the viscosity-reducing slump-retaining agent.
Preparation example 3
A preparation method of the viscosity-reducing slump-retaining agent comprises the following steps: taking 10.5kg of octadecanol and 2kg of pyrophosphoric acid to dissolve in ethanol (the amount of ethanol is enough to dissolve the long-chain alcohol and the pyrophosphoric acid), carrying out phosphorylation treatment on the long-chain alcohol by the pyrophosphoric acid, reacting for 1h at room temperature, adding 1kg of quaternary ammonium base and 0.6kg of p-xylene, then adding 1kg of pyrophosphoric acid again to carry out acidification treatment, drying for 6h at 40 ℃ to obtain a product with a gemini structure, mixing the product with 1.5kg of epoxypropane, 1kg of styrene and water, heating for 5min at 80 ℃ to obtain a heating solution, adding 1.5kg of hydroxyethyl methacrylate phosphate and 0.8kg of methyl methacrylate into the heating solution under the condition of keeping the temperature of the heating solution unchanged, reacting for 6h to obtain a reaction product, and adjusting the pH value of the reaction product to be 7 to obtain the viscosity reducing and slump retaining agent.
Preparation example 4
A viscosity and slump loss reducing agent is different from the preparation example 1 in that propylene oxide is not included in the preparation process of the viscosity and slump loss reducing agent.
Preparation example 5
A viscosity-reducing slump-retaining agent is different from the preparation example 1 in that hydroxyethyl methacrylate phosphate is not included in the preparation process of the viscosity-reducing slump-retaining agent.
Preparation example 6
A viscosity and slump loss resistant agent is different from the preparation example 1 in that methyl methacrylate is not included in the preparation process of the viscosity and slump loss resistant agent.
Preparation example 7
Different from the preparation example 1, the viscosity and slump loss resistant agent is prepared without propylene oxide, hydroxyethyl methacrylate phosphate and methyl methacrylate.
Preparation example 8
Different from the preparation example 1, the viscosity and slump loss reducing agent is prepared by using tridecanol with equal mass instead of octadecanol.
Preparation example 9
Different from the preparation example 1, the viscosity and slump loss reducing agent uses hexadecanol with equal mass to replace octadecanol in the preparation process.
Examples
The cement in the embodiment of the application is ordinary portland cement, and the whelk brand P.0.42.5 is selected; the fly ash is S95 fly ash, and the mixing water is water for residents.
Example 1
The LC40 full-light pumping ceramsite concrete comprises the following raw materials in parts by weight: 314kg of cement, 26kg of fly ash, 170kg of mixing water, 820kg of ceramic sand, 520kg of ceramsite and 3kg of viscosity reducing and slump retaining agent; wherein, the viscosity-reducing slump-retaining agent is prepared by the preparation example 1.
The preparation method of the LC40 all-light pumping ceramsite concrete comprises the following steps:
mixing water and a slump retaining agent, and uniformly stirring to obtain a first mixture;
step two, uniformly stirring the cement and the fly ash, mixing the mixture with the first mixture, and uniformly stirring to obtain a second mixture;
and step three, performing saturated pre-wetting treatment on the ceramsite and the ceramic sand, and then uniformly stirring the mixture and the second mixture to prepare the LC40 full-light pumping ceramsite concrete.
Examples 2 to 9
The difference between the LC40 all-light pumping ceramsite concrete and the example 1 is that the viscosity and slump retaining agent prepared in the preparation examples 2-7 is adopted in sequence.
Example 10
The LC40 all-light pumping ceramsite concrete is different from the concrete in example 1 in that the concrete comprises the following raw materials in parts by weight: 304kg of cement, 16kg of fly ash, 160kg of mixing water, 800kg of ceramic sand, 500kg of ceramsite and 1kg of viscosity reducing and slump retaining agent.
Example 11
The LC40 all-light pumping ceramsite concrete is different from the concrete in example 1 in that the concrete comprises the following raw materials in parts by weight: 324kg of cement, 36kg of fly ash, 180kg of mixing water, 840kg of ceramic sand, 540kg of ceramsite and 5kg of viscosity-reducing slump-retaining agent.
Comparative example
Comparative example 1
An LC40 all-light pumping ceramsite concrete is different from the concrete in example 1 in that a viscosity-reducing slump-retaining agent is not used.
Comparative example 2
The LC40 all-light pumping ceramsite concrete is different from the concrete in example 1 in that an ordinary concrete viscosity reducer with equal mass is used for replacing a viscosity reducing and slump retaining agent.
Detection method
1. Concrete strength detection
The concrete prepared in examples 1-11 and comparative examples 1-2 was subjected to a 28d compressive strength test according to GB/T50081-2002 Standard test methods for mechanical Properties of general concrete. In the test process, the load should be continuously and uniformly applied, when the strength grade of the concrete is more than or equal to C30 and less than C60, 0.5-0.8 MPa per second is taken, when the test piece is close to the damage and begins to deform rapidly, the accelerator of the testing machine should be stopped being adjusted until the test piece is damaged, and then the load of the damage is recorded and loaded in the table 1.
2. Concrete dry apparent density detection
The concrete prepared in examples 1 to 11 and comparative examples 1 to 2 was subjected to a dry apparent density test, and the dry apparent density test results were recorded in table 1 according to JGJ/T70-2009 "test method standard for basic performance of building mortar".
3. Concrete slump detection
Slump tests were carried out on the ready-mixed concretes prepared in examples 1 to 11 and comparative examples 1 to 2, according to GB/T50080-2016 "test method for ordinary concrete mixture Properties", and the test data are recorded in Table 1.
TABLE 1
Figure BDA0003573113660000071
As can be seen from the combination of examples 1 to 9 and table 1, the slump loss reducing agent prepared in the present application has a gemini structure, which is similar to the structure in which two single-chain molecules are connected by a chemical bond, thereby reducing the equilibrium distance between polar groups, fundamentally overcoming the separation tendency of the conventional single-ion surfactant due to the charge repulsion between ion head groups or hydration, promoting the close arrangement of the conventional single-ion surfactant in an interface or a molecular aggregate, so that non-polar groups are arranged in a vertical state, and compared with the conventional viscosity reduction, the surface energy is more effectively reduced, thereby improving the surface activity of the conventional single-ion surfactant, and further improving the viscosity reduction effect of the conventional single-ion surfactant on concrete;
after the viscosity reducing and slump retaining agent is doped with the epoxypropane and the styrene, the hydrophilic and oleophilic value of the viscosity reducing and slump retaining agent can be adjusted, so that the hydrophobic property of molecules is enhanced, and compared with the traditional concrete viscosity reducing agent, the surface activity is enhanced, and the fluidity of concrete is further improved; in addition, the epoxypropane can enhance the foam stabilizing capability of the styrene lifting viscosity slump retaining agent, and micro bubbles in the concrete ready-mixed slurry can play a role in ball lubrication, so that the viscosity of the concrete ready-mixed slurry is further reduced; finally, the epoxypropane and the styrene promote the methyl methacrylate to release free water bound by side chains, so that the free water in the concrete ready-mixed slurry body becomes more, the viscosity of the concrete is reduced, the cement hydration reaction is promoted to a certain extent to be fully carried out, and the mechanical property of the concrete is not influenced by the negative effect of the viscosity-reducing slump retaining agent;
phosphate groups in the hydroxyethyl methacrylate phosphate can form a compact phosphate thin layer on the surface of cement to inhibit the entry of water molecules, so that the reaction speed of cement hydration is slowed down, the free water content in the concrete ready-mixed slurry is increased, and the dispersing performance of the cement is improved; the methyl methacrylate contains a hydrophobic group methyl group, so that the hydrophilic-lipophilic balance value of the viscosity reducing and slump retaining agent molecules can be improved, the surface activity regulating effect of the epoxypropane and the styrene on the viscosity reducing and slump retaining agent is further stabilized, and the viscosity of concrete is reduced; and the viscosity-reducing slump-retaining agent prepared in the embodiment of the application ensures the slump of the all-light concrete.
Combining example 1, examples 10 to 11 and table 1, it can be seen that the slump loss resistant agent prepared by using octadecanol has a relatively excellent slump loss resistant effect, because the chain length of the gemini structure of the slump loss resistant agent is increased, the point positions where the slump loss resistant agent can be combined with the modified functional groups are increased, and thus the slump loss resistant effect is better achieved.
By combining the example 1, the comparative examples 1-2 and the table 1, it can be seen that the viscosity and slump retaining agent can ensure the mechanical properties of the concrete under the condition of ensuring the working performance of the concrete.
The specific embodiments are only for explaining the present application and are not limiting to the present application, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent law within the scope of the claims of the present application.

Claims (8)

1. The LC40 all-light pumping ceramsite concrete is characterized by comprising the following raw materials in parts by weight:
420-500 parts of a cementing material;
160-180 parts of mixing water;
800-840 parts of pottery sand;
500-540 parts of ceramsite;
1-5 parts of viscosity-reducing slump-retaining agent;
the viscosity-reducing slump-retaining agent comprises the following raw materials in parts by weight:
90-105 parts of long-chain alcohol;
5-10 parts of quaternary ammonium base;
3-6 parts of p-xylene;
10-15 parts of propylene oxide;
5-10 parts of styrene;
5-15 parts of hydroxyethyl methacrylate phosphate;
2-8 parts of methyl methacrylate; and a proper amount of water.
2. The LC40 all-light pumping ceramsite concrete according to claim 1, wherein the viscosity-reducing slump-retaining agent is prepared by adopting the following steps: the long-chain alcohol is phosphorylated and then reacts with quaternary ammonium hydroxide, a product obtained after p-xylene is introduced is subjected to acidification treatment again to obtain a product with a gemini structure, the product with the gemini structure is mixed with propylene oxide, styrene and water and then heated to obtain a heated solution, hydroxyethyl methacrylate phosphate and methyl methacrylate are added into the obtained mixed solution, a reaction product is obtained after reaction for a period of time, the reaction product is cooled to room temperature, the pH value of the reaction product is adjusted, and the viscosity-reducing slump-retaining agent with the solid content of 35% -45% is obtained.
3. The LC40 all-light pumping ceramsite concrete according to claim 2, wherein in the step of preparing the viscosity and slump retaining agent, the heating temperature is 50-80 ℃, the heating time is 5-20min, the reaction time is 4-6h, and the viscosity and slump retaining agent is obtained by adjusting the pH value of a reaction product to 6-7.
4. The LC40 all-light pumping ceramsite concrete according to claim 1, wherein the concrete comprises: the long-chain alcohol is any one of tridecanol, hexadecanol and octadecanol.
5. The LC40 all-light pumping ceramsite concrete according to claim 1, wherein the concrete comprises: the ceramsite is crushed stone type shale ceramsite with 5mm-20mm continuous gradation, and the material of the ceramic sand is the same as that of the ceramsite.
6. The LC40 all-light pumping ceramsite concrete according to claim 1, wherein the concrete comprises: the bulk density of the ceramsite is 700-900kg/m 3 The water absorption rate is not more than 4% in 1 hour, 6% -8% in 2 hours and the cylinder pressure strength is 8-12Mpa; the pottery sand is medium sand, and the stacking density of the pottery sand is 1500-1600kg/m 3 。
7. The LC40 all-light pumping ceramsite concrete according to claim 1, wherein the concrete is prepared from the following raw materials in percentage by weight based on a cementing material: the cementing material comprises 320-360 parts of cement; 100-140 parts of fly ash.
8. The method for preparing LC40 full-light pumping ceramsite concrete according to any one of claims 1-7, which is characterized in that: the method comprises the following steps:
step one, mixing water and a viscosity-reducing slump-retaining agent, and uniformly stirring to obtain a first mixture;
step two, uniformly stirring the cement and the fly ash, mixing the mixture with the first mixture, and uniformly stirring to obtain a second mixture;
and step three, performing saturation pre-wetting treatment on the ceramsite and the ceramic sand, and then uniformly stirring the ceramsite and the second mixture to prepare the LC40 full-light pumping ceramsite concrete.
CN202210325102.5A 2022-03-30 2022-03-30 LC40 full-light pumping ceramsite concrete and preparation method thereof Active CN114956712B (en)

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JP2000344563A (en) * 1999-06-02 2000-12-12 Kajima Corp Lightweight aggregate concrete excellent in pump forced feedability
CN104016641B (en) * 2014-06-25 2016-04-13 上海建工材料工程有限公司 A kind of LC35 concrete of high-strength light pumpability and pumping casting method thereof
CN109534738A (en) * 2019-01-12 2019-03-29 武汉中阳明建材有限公司 A kind of high strength lightweight aggregate concrete and preparation method thereof
CN110304876A (en) * 2019-06-17 2019-10-08 三峡大学 A kind of complete gently haydite concrete and preparation method thereof
CN110240446A (en) * 2019-06-18 2019-09-17 中建西部建设贵州有限公司 A kind of self-compacting lightweight aggregate machine-made sand concrete and preparation method thereof
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