CN114057445A - Steam-cured concrete and preparation method thereof - Google Patents

Steam-cured concrete and preparation method thereof Download PDF

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Publication number
CN114057445A
CN114057445A CN202111238423.3A CN202111238423A CN114057445A CN 114057445 A CN114057445 A CN 114057445A CN 202111238423 A CN202111238423 A CN 202111238423A CN 114057445 A CN114057445 A CN 114057445A
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parts
aggregate
water
steam
cement
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李保亮
董云
王大伟
丁百湛
艾月飞
李品华
刘泽俊
程永振
刘宇翼
唐洲洋
孙民辉
秦鑫
唐彬
万鸿鸣
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Huaiyin Institute of Technology
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/04Portland cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20Resistance against chemical, physical or biological attack
    • C04B2111/2015Sulfate resistance
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

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

Abstract

The invention discloses steam-cured concrete and a preparation method thereof, wherein the steam-cured concrete is prepared from the following raw materials in parts by weight: 400 parts of cement-200-used materials, 40-80 parts of metakaolin, 40-80 parts of nickel slag powder, 200 parts of mineral powder-100-used materials, 800 parts of fine aggregate-600-used materials, 1300 parts of coarse aggregate-900-used materials, 10-50 parts of fiber tubes, 130 parts of water-100-used materials, 1-10 parts of aggregate treating agents and 3-10 parts of water reducing agents. The cement adopted by the invention firstly controls the SO of the cement3The content is provided with the coarse aggregate treating agent, the lower water consumption and the lower water-cement ratio are adopted, and the fiber pipe is also adopted for the later hydration and water supplement of the steamed concrete, so that the problems of insufficient later strength and poor durability of the steamed concrete are solved.

Description

Steam-cured concrete and preparation method thereof
Technical Field
The invention belongs to the technical field of prefabricated concrete, and particularly relates to steam-cured concrete and a preparation method thereof.
Background
Compared with the traditional cast-in-place building, the prefabricated building has good construction quality, the construction is usually realized by steam-cured concrete, and the steam-cured concrete has higher early strength, but the later strength development and the durability are weaker than those of common concrete. The main reasons for this phenomenon are: 1) the early and too fast hydration process of the cement-based material causes the distribution of hydration products to be uneven and more tiny cracks to exist in the concrete; 2) more hydration products are formed in the early stage to tightly wrap unhydrated cement particles, so that the contact between water and the unhydrated cement particles is isolated, and the later stage hydration of the cement particles is avoided; 3) the interior of the concrete is dry, the interior is lack of water, and the later hydration of the concrete is difficult to continue; 4) the cement hydration products such as calcium hydroxide and ettringite are enriched and grow around the aggregate, which is not favorable for the durability of concrete.
The current research on steam-cured concrete mainly focuses on the early strength of the steam-cured concrete:
CN201210381195.X provides an additive for improving durability of steamed concrete and concrete coarse aggregate treated by the additive, wherein the additive comprises 20-80 wt% of a calcium hydroxide crystallization inhibitor and 20-80 wt% of an ettringite crystallization inhibitor. Taking an additive accounting for 0.25-3.35% of the mass of the concrete coarse aggregate, preparing a solution with the concentration of 1-10 wt%, then adjusting the pH value to 7.0-7.5, soaking or uniformly spraying the concrete coarse aggregate with the solution, taking out the coarse aggregate after 24 hours, and airing until no obvious water stain exists on the surface, thus obtaining the treated coarse aggregate. The invention can effectively improve the durability of the steam-cured concrete member.
CN201510513444.X A special high-activity composite admixture for steam-cured concrete products, the preparation method comprises the following steps: preparing raw materials in proportion: according to the mass ratio, the anhydrite, the silicon powder, the fly ash and the ground slag powder are mixed in a ratio of 0.35:0.30:0.30: 1. The special high-activity composite admixture for the steam-cured concrete product is beneficial to improving the workability of high-performance concrete of the pipe pile, and the micro powder is added to increase the initial slump and the flowability of fresh concrete slurry to be superior to the self characteristics of calcium sulfate, so that the slurry can be plasticized to a certain extent, the cohesiveness of the concrete slurry is improved, the concrete is not easy to generate segregation and bleeding under the condition of large slump, and the integral workability of the concrete is improved.
CN 201811067270.9A method for preparing non-autoclaved concrete containing an early strength agent, wherein the early strength agent consists of nano silicon dioxide, lithium sulfate and a polycarboxylic acid water reducing agent.
CN 202011134589.6A preparation method of coarse aggregate for improving durability of steam-cured concrete, which is characterized by comprising the following steps: uniformly mixing the coarse aggregate, the composite polymer emulsion and the defoaming agent, then maintaining, and obtaining the coarse aggregate for improving the durability of the steamed concrete after surface demulsification; wherein the composite polymer emulsion is prepared by compounding ethylene-vinyl acetate copolymer emulsion and emulsified asphalt.
There are reports on how to improve the later strength and durability of steam-cured concrete.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the steam-cured concrete, which solves the problems of low later strength and poor durability of the steam-cured concrete; the invention also aims to provide a preparation method of the steam-cured concrete.
The invention is realized by the following technical scheme:
the steam-cured concrete is prepared from the following raw materials in parts by weight: 400 parts of cement-200-used materials, 40-80 parts of metakaolin, 40-80 parts of nickel slag powder, 200 parts of mineral powder-100-used materials, 800 parts of fine aggregate-600-used materials, 1300 parts of coarse aggregate-900-used materials, 10-50 parts of fiber tubes, 130 parts of water-100-used materials, 1-10 parts of aggregate treating agents and 3-10 parts of water reducing agents.
The invention further improves the scheme as follows:
the cement is PI or PII52.5 cement, and SO thereof3The content is less than 1.5 percent; the cement comprises two parts, wherein the specific surface area is more than 400 m2The part of the powder/kg accounts for 30-40%, and the specific surface area is more than 300 m2The part of the oil/kg accounts for 60-70%.
Further, the metakaolin has a specific surface area of more than 500m2/kg。
Further, the aggregate treating agent comprises a coarse aggregate treating agent and a fine aggregate treating agent, wherein the coarse aggregate treating agent comprises 1-5 parts of formic acid, 1-5 parts of acetic acid, 1-5 parts of acrylic acid and 85-95 parts of water; the fine aggregate treating agent consists of 1-10 parts of sodium hexametaphosphate, 1-10 parts of sodium pyrophosphate, 1-10 parts of sodium carbonate, 1-3 parts of glycerol and 80-96 parts of water.
Furthermore, in the aggregate treating agent, the dosage of the coarse aggregate treating agent is 1-5% of the mass of the coarse aggregate, and the dosage of the fine aggregate treating agent is 1-5% of the mass of the fine aggregate.
Further, in the coarse aggregate treating agent, the mass concentration of formic acid is more than or equal to 80 percent; the mass concentration of acetic acid is more than or equal to 80 percent; the mass concentration of the acrylic acid is more than or equal to 80 percent.
Furthermore, the pipe wall of the fiber pipe is made of permeable membrane materials, the fiber pipe needs to be subjected to soaking treatment before use, and the length of the fiber pipe is 5-15 mm.
Furthermore, the water reducing agent is free of retarding components.
The invention further improves the scheme as follows:
a preparation method of steam-cured concrete comprises the following steps:
1) washing coarse aggregate and fine aggregate with water to ensure that the surfaces of the coarse aggregate and the fine aggregate have no impurities such as mud, mud blocks and the like, and airing;
2) preparing a coarse aggregate treating agent and a fine aggregate treating agent according to a proportion, spraying the treating agents on the surfaces of cleaned coarse aggregates and fine aggregates in a spraying mode, stirring the coarse aggregates and the fine aggregates while spraying, stirring for 1-5 minutes, and then airing until no obvious water mark exists on the surfaces;
3) weighing 10-20 parts of cement and 10-20 parts of water, adding the cement and the water into a stirring pot, stirring the mixture into slurry, adding the treated coarse aggregate and fine aggregate, and stirring the mixture for 1-3 minutes;
4) then adding the rest cement, the higher soil, the nickel slag powder, the mineral powder and the fiber pipe, carrying out dry stirring for 1 minute, then adding the rest water and the water reducing agent, and continuing stirring for 1-2 minutes;
5) filling the concrete obtained in the step 3) into an iron mold, and standing for 1-3 hours;
6) moving the concrete in the step 4) to a steam curing room, heating to 40-60 ℃ according to the heating rate of 20 ℃/hour, preserving heat for 5-10 hours, and then cooling to room temperature according to the cooling rate of 20 ℃/hour;
7) and removing the mold and performing wet curing for 1-7 d.
The invention has the beneficial effects that:
1. the cement adopted by the invention firstly controls the SO of the cement3Content of SO3Mainly comes from gypsum, plays the retardation role in cement, but gypsum in steam-cured concrete can accelerate hydration of cement, improve early strength of steam-cured concrete, but is not favorable for later strength of steam-cured concrete, and SO simultaneously3Ettringite can be formed in the steamed concrete, which is not favorable for the volume stability of the steamed concrete; in addition, the cement is divided into coarse particles and fine particles, the fine particle part is hydrated quickly in the early steam-curing process to provide early strength for the concrete, and the coarse particle part is hydrated slowly to provide a cement source for later hydration of the steam-cured concrete.
2. The invention is provided with the coarse aggregate treating agent, the main component of which is weak acid, the weak acid is used for treating the aggregate, firstly, the weak acid can react with the surface of the aggregate to form pitting corrosion on the surface of the aggregate, the specific surface area of the aggregate is improved, and the bond stress of cement paste and the aggregate can be improved; in addition, the pH value of the surface of the aggregate can be reduced by weak acid treatment of the aggregate, and the low-density distribution calcium hydroxide enriched and grown on the surface of the aggregate under the steam-curing condition can be consumed by the lower pH value or weak acid, so that the compactness of the interface between cement paste and the aggregate is improved; in addition, the reaction products of the weak acid and the calcium hydroxide are calcium formate, calcium acetate and the like, so that the hydration of cement can be accelerated, the hydration products on the surface of the aggregate are increased, and the strength of a concrete strength weak area, namely the strength of a cement slurry and an aggregate interface can be improved. The fine aggregate treating agent can change the environment of the surface of the fine aggregate, delay and change the crystallization state of calcium hydroxide and ettringite on the surface of the fine aggregate, and improve the durability of concrete.
3. The invention adopts lower water consumption and lower water-cement ratio, and in the steam curing process, the more water consumption, the more concrete expansion and the poorer later durability of the concrete are; in order to prevent the internal water shortage of the steam-cured concrete, the invention also adopts the fiber pipe to supplement water for the later hydration of the steam-cured concrete, provides later strength for the concrete by utilizing the hydration of the later cement coarse particles, and repairs the tiny cracks generated in the early steam-cured process of the concrete.
4. The use of metakaolin and slag powder can further reduce SO in a cementing material system3The content reduces the formation amount of ettringite and simultaneously reduces the formation amount of calcium hydroxide, and the use of ferronickel slag powder is helpful to ensure the increase of the later strength of the steamed concrete.
Detailed Description
Example 1
The steam-cured concrete is prepared from the following raw materials in parts by weight: 400 parts of cement, 40 parts of metakaolin, 80 parts of nickel slag powder, 200 parts of mineral powder, 800 parts of fine aggregate, 900 parts of coarse aggregate, 50 parts of fiber tube, 130 parts of water, 10 parts of aggregate treating agent and 3 parts of water reducing agent.
Wherein, sand is used as fine aggregate, and stones are used as coarse aggregate;
wherein the cement is PII52.5 cement and SO thereof3The content is less than 1.5 percent; the cement comprises two parts, whereinThe specific surface area is more than 400 m2The part of the powder/kg accounts for 40 percent, and the specific surface area is more than 300 m2The portion/kg amounts to 60%;
wherein the metakaolin has a specific surface area of more than 500m2/kg;
The coarse aggregate treatment agent comprises 1 part of formic acid, 5 parts of acetic acid, 5 parts of acrylic acid and 89 parts of water, wherein the mass concentrations of the formic acid, the acetic acid and the acrylic acid are all more than or equal to 80%; the fine aggregate treating agent comprises: 1 part of sodium hexametaphosphate, 10 parts of sodium pyrophosphate, 8 parts of sodium carbonate, 1 part of glycerol and 80 parts of water;
wherein the tube wall of the fiber tube is made of permeable membrane material, the fiber tube needs to be subjected to soaking treatment before use, and the length of the fiber tube is 15 mm;
wherein, the water reducing agent contains no retarding component.
The steam-cured concrete is prepared according to the following steps:
1) washing coarse aggregate and fine aggregate with water to ensure that the surfaces of the coarse aggregate and the fine aggregate have no impurities such as mud, mud blocks and the like, and airing;
2) preparing a coarse aggregate and a fine aggregate treating agent according to a proportion, spraying the treating agent on the surfaces of cleaned coarse and fine aggregates in a spraying mode, stirring the coarse and fine aggregates while spraying, stirring for 1 minute, and then airing until no obvious water mark exists on the surfaces;
3) weighing 10 parts of cement and 10 parts of water, adding the cement and the water into a stirring pot, stirring the mixture into slurry, adding the treated coarse aggregate and the treated fine aggregate, and stirring the mixture for 3 minutes;
4) weighing the treated coarse and fine aggregates according to a proportion, carrying out dry stirring for 1 minute, then adding cement, higher soil, nickel slag powder, mineral powder and a fiber pipe, carrying out dry stirring for 1 minute, then adding water and a water reducing agent, and continuing stirring for 1-2 minutes;
5) filling the concrete obtained in the step 3) into an iron mold, and standing for 3 hours;
6) and (3) moving the concrete in the step 4) to a steam curing chamber, heating to 40 ℃ according to the heating rate of 20 ℃/h, preserving heat for 10h, and then cooling to room temperature according to the cooling rate of 20 ℃/h.
7) And (7) removing the mold and performing wet maintenance for 7 d.
Example 2
The steam-cured concrete is prepared from the following raw materials in parts by weight: 200 parts of cement, 80 parts of metakaolin, 80 parts of nickel slag powder, 100 parts of mineral powder, 600 parts of fine aggregate, 1300 parts of coarse aggregate, 10 parts of fiber tube, 100 parts of water, 1 part of aggregate treating agent and 10 parts of water reducing agent.
Wherein, sand is used as fine aggregate, and stones are used as coarse aggregate;
wherein the cement is PI 52.5 cement and SO thereof3The content is less than 1.5 percent; the cement comprises two parts, wherein the specific surface area is more than 400 m2The part of the powder/kg accounts for 30 percent, and the specific surface area is more than 300 m2The fraction/kg is 70%;
wherein the metakaolin has a specific surface area of more than 500m2/kg;
The method comprises the following steps of preparing a coarse aggregate treating agent, a fine aggregate treating agent and a water treating agent, wherein the using amount of the coarse aggregate treating agent is 1% of the mass of the coarse aggregate, the using amount of the fine aggregate treating agent is 5% of the mass of the fine aggregate, the coarse aggregate treating agent comprises 5 parts of formic acid, 5 parts of acetic acid, 5 parts of acrylic acid and 85 parts of water, and the mass concentrations of the formic acid, the acetic acid and the acrylic acid are all more than or equal to 80%; the fine aggregate treating agent comprises: 1 part of sodium hexametaphosphate, 1 part of sodium pyrophosphate, 1 part of sodium carbonate, 1 part of glycerol and 96 parts of water;
wherein the tube wall of the fiber tube is made of permeable membrane material, the fiber tube needs to be subjected to soaking treatment before use, and the length of the fiber tube is 5 mm;
wherein, the water reducing agent contains no retarding component.
The steam-cured concrete is prepared according to the following steps:
1) washing coarse aggregate and fine aggregate with water to ensure that the surfaces of the coarse aggregate and the fine aggregate have no impurities such as mud, mud blocks and the like, and airing;
2) preparing a coarse aggregate and a fine aggregate treating agent according to a proportion, spraying the treating agent on the surfaces of cleaned coarse and fine aggregates in a spraying mode, stirring the coarse and fine aggregates while spraying, stirring for 5 minutes, and then airing until no obvious water mark exists on the surfaces;
3) weighing 20 parts of cement and 20 parts of water, adding the cement and the water into a stirring pot, stirring the mixture into slurry, adding the treated coarse aggregate and the treated fine aggregate, and stirring the mixture for 2 minutes;
4) weighing the treated coarse and fine aggregates according to a proportion, carrying out dry stirring for 2 minutes, then adding cement, higher soil, nickel slag powder, mineral powder and a fiber pipe, carrying out dry stirring for 1 minute, then adding water and a water reducing agent, and continuing stirring for 1-2 minutes;
5) filling the concrete obtained in the step 3) into an iron mold, and standing for 1 hour;
6) and (3) moving the concrete in the step 4) to a steam curing chamber, heating to 60 ℃ according to the heating rate of 20 ℃/h, preserving heat for 5h, and then cooling to room temperature according to the cooling rate of 20 ℃/h.
7) And (5) removing the mold and performing wet maintenance for 1 d.
Example 3
The steam-cured concrete is prepared from the following raw materials in parts by weight: 300 parts of cement, 50 parts of metakaolin, 50 parts of nickel slag powder, 100 parts of mineral powder, 700 parts of fine aggregate, 1100 parts of coarse aggregate, 40 parts of fiber tube, 120 parts of water, 8 parts of aggregate treating agent and 5 parts of water reducing agent.
Wherein, sand is used as fine aggregate, and stones are used as coarse aggregate;
wherein the cement is PII52.5 cement and SO thereof3The content is less than 1.5 percent; the cement comprises two parts, wherein the specific surface area is more than 400 m2The part of the powder/kg accounts for 35 percent, and the specific surface area is more than 300 m2The portion/kg is 65%;
wherein the metakaolin has a specific surface area of more than 500m2/kg;
The method comprises the following steps of preparing a coarse aggregate treating agent, a fine aggregate treating agent and a water treatment agent, wherein the using amount of the coarse aggregate treating agent is 5% of the mass of the coarse aggregate, the using amount of the fine aggregate treating agent is 3% of the mass of the fine aggregate, the coarse aggregate treating agent comprises 1 part of formic acid, 1 part of acetic acid, 3 parts of acrylic acid and 95 parts of water, and the mass concentrations of the formic acid, the acetic acid and the acrylic acid are all more than or equal to 80%; the fine aggregate treating agent comprises: 5 parts of sodium hexametaphosphate, 5 parts of sodium pyrophosphate, 5 parts of sodium carbonate, 3 parts of glycerol and 82 parts of water;
wherein the tube wall of the fiber tube is made of permeable membrane material, the fiber tube needs to be subjected to soaking treatment before use, and the length of the fiber tube is 10 mm;
wherein, the water reducing agent contains no retarding component.
The steam-cured concrete is prepared according to the following steps:
1) washing coarse aggregate and fine aggregate with water to ensure that the surfaces of the coarse aggregate and the fine aggregate have no impurities such as mud, mud blocks and the like, and airing;
2) preparing a coarse aggregate and a fine aggregate treating agent according to a proportion, spraying the treating agent on the surfaces of cleaned coarse and fine aggregates in a spraying mode, stirring the coarse and fine aggregates while spraying, stirring for 4 minutes, and then airing until no obvious water mark exists on the surfaces;
3) weighing 10 parts of cement and 20 parts of water, adding the cement and the water into a stirring pot, stirring the mixture into slurry, adding the treated coarse aggregate and the treated fine aggregate, and stirring the mixture for 1 minute;
4) weighing the treated coarse and fine aggregates according to a proportion, carrying out dry stirring for 2 minutes, then adding cement, higher soil, nickel slag powder, mineral powder and a fiber pipe, carrying out dry stirring for 1 minute, then adding water and a water reducing agent, and continuing stirring for 1-2 minutes;
5) filling the concrete obtained in the step 3) into an iron mold, and standing for 3 hours;
6) and (3) moving the concrete in the step 4) to a steam curing chamber, heating to 60 ℃ according to the heating rate of 20 ℃/h, preserving heat for 10h, and then cooling to room temperature according to the cooling rate of 20 ℃/h.
7) And (7) removing the mold and performing wet maintenance for 7 d.
Example 4
The steam-cured concrete is prepared from the following raw materials in parts by weight: 200 parts of cement, 80 parts of metakaolin, 80 parts of nickel slag powder, 200 parts of mineral powder, 600 parts of fine aggregate, 1200 parts of coarse aggregate, 50 parts of fiber tube, 120 parts of water, 8 parts of aggregate treating agent and 8 parts of water reducing agent.
Wherein, sand is used as fine aggregate, and stones are used as coarse aggregate;
wherein the cement is PII52.5 cement and SO thereof3The content is less than 1.5 percent; the cement comprises two parts, wherein the specific surface area is more than 400 m2The part of the powder/kg accounts for 30 percent, and the specific surface area is more than 300 m2The fraction/kg is 70%;
wherein the metakaolin has a specific surface area of more than 500m2/kg;
The method comprises the following steps of preparing a coarse aggregate treating agent, a fine aggregate treating agent and a water, wherein the using amount of the coarse aggregate treating agent is 3% of the mass of the coarse aggregate, the using amount of the fine aggregate treating agent is 3% of the mass of the fine aggregate, the coarse aggregate treating agent comprises 1 part of formic acid, 2 parts of acetic acid, 2 parts of acrylic acid and 95 parts of water, and the mass concentrations of the formic acid, the acetic acid and the acrylic acid are all more than or equal to 80%; the fine aggregate treating agent comprises: 3 parts of sodium hexametaphosphate, 3 parts of sodium pyrophosphate, 3 parts of sodium carbonate, 1 part of glycerol and 90 parts of water;
wherein the tube wall of the fiber tube is made of permeable membrane material, the fiber tube needs to be subjected to soaking treatment before use, and the length of the fiber tube is 12 mm;
wherein, the water reducing agent contains no retarding component.
The steam-cured concrete is prepared according to the following steps:
1) washing coarse aggregate and fine aggregate with water to ensure that the surfaces of the coarse aggregate and the fine aggregate have no impurities such as mud, mud blocks and the like, and airing;
2) preparing a coarse aggregate and a fine aggregate treating agent according to a proportion, spraying the treating agent on the surfaces of cleaned coarse and fine aggregates in a spraying mode, stirring the coarse and fine aggregates while spraying, stirring for 4 minutes, and then airing until no obvious water mark exists on the surfaces;
3) weighing 10 parts of cement and 20 parts of water, adding the cement and the water into a stirring pot, stirring the mixture into slurry, adding the treated coarse aggregate and the treated fine aggregate, and stirring the mixture for 1 minute;
4) weighing the treated coarse and fine aggregates according to a proportion, carrying out dry stirring for 2 minutes, then adding cement, higher soil, nickel slag powder, mineral powder and a fiber pipe, carrying out dry stirring for 1 minute, then adding water and a water reducing agent, and continuing stirring for 1-2 minutes;
5) filling the concrete obtained in the step 3) into an iron mold, and standing for 3 hours;
6) and (3) moving the concrete in the step 4) to a steam curing chamber, heating to 60 ℃ according to the heating rate of 20 ℃/h, preserving heat for 5h, and then cooling to room temperature according to the cooling rate of 20 ℃/h.
7) And (7) removing the mold and performing wet maintenance for 7 d.
Comparative example:
420kg of PII52.5 cement, 810kg of sand, 1105kg of stones, 160kg of water and 5kg of water reducing agent, wherein the steam curing temperature is 60 ℃, and the constant temperature of 60 ℃ is 12 hours.
Table 1 shows performance assessment indexes of the concrete slump and compressive strength of the concrete prepared in examples 1 to 4 and the concrete prepared in comparative example 1, and test results are shown in Table 1 according to the test method of GB/T50080-2016 Standard test method for Performance of common concrete mixture and GB50081-2002 Standard test method for mechanical Performance of common concrete.
TABLE 1
Figure DEST_PATH_IMAGE001
As can be seen from Table 1, the 28d strength of the comparative example and the example is about 50MPa, but it is obvious that the later strength of the examples 1-4 of the present invention is obviously higher than that of the comparative example, and the durability such as sulfate corrosion resistance is also obviously higher than that of the comparative example.

Claims (9)

1. The steam-cured concrete is characterized by comprising the following raw materials in parts by weight: 400 parts of cement-200-used materials, 40-80 parts of metakaolin, 40-80 parts of nickel slag powder, 200 parts of mineral powder-100-used materials, 800 parts of fine aggregate-600-used materials, 1300 parts of coarse aggregate-900-used materials, 10-50 parts of fiber tubes, 130 parts of water-100-used materials, 1-10 parts of aggregate treating agents and 3-10 parts of water reducing agents.
2. A steam-cured concrete according to claim 1, wherein: the cement is PI or PII52.5 cement, and SO thereof3The content is less than 1.5 percent; the cement comprises two parts, wherein the specific surface area is more than 400 m2The part of the powder/kg accounts for 30-40%, and the specific surface area is more than 300 m2The part of the oil/kg accounts for 60-70%.
3. A steam-cured concrete according to claim 1, wherein: the metakaolin has a specific surface area of more than 500m2/kg。
4. A steam-cured concrete according to claim 1, wherein: the aggregate treating agent comprises a coarse aggregate treating agent and a fine aggregate treating agent, wherein the coarse aggregate treating agent consists of 1-5 parts of formic acid, 1-5 parts of acetic acid, 1-5 parts of acrylic acid and 85-95 parts of water; the fine aggregate treating agent consists of 1-10 parts of sodium hexametaphosphate, 1-10 parts of sodium pyrophosphate, 1-10 parts of sodium carbonate, 1-3 parts of glycerol and 80-96 parts of water.
5. A steam-cured concrete according to claim 4, wherein: in the coarse aggregate treating agent, the mass concentration of formic acid is more than or equal to 80 percent; the mass concentration of acetic acid is more than or equal to 80 percent; the mass concentration of the acrylic acid is more than or equal to 80 percent.
6. The steam-cured concrete according to claim 4, wherein: the dosage of the coarse aggregate treating agent is 1-5% of the mass of the coarse aggregate, and the dosage of the fine aggregate treating agent is 1-5% of the mass of the fine aggregate.
7. A steam-cured concrete according to claim 1, wherein: the pipe wall of fibre pipe is the osmotic membrane material, and the fibre pipe needs to be through soaking treatment before using, and fibre pipe length is 5~15 mm.
8. A steam-cured concrete according to claim 1, wherein: the water reducing agent contains no retarding component.
9. Method for preparing a steam-cured concrete according to any one of claims 1 to 8, comprising the following steps:
1) washing coarse aggregate and fine aggregate with water to ensure that the surfaces of the coarse aggregate and the fine aggregate have no impurities such as mud, mud blocks and the like, and airing;
2) preparing a coarse aggregate treating agent and a fine aggregate treating agent according to a proportion, spraying the treating agents on the surfaces of cleaned coarse aggregates and fine aggregates in a spraying mode, stirring the coarse aggregates and the fine aggregates while spraying, stirring for 1-5 minutes, and then airing until no obvious water mark exists on the surfaces;
3) weighing 10-20 parts of cement and 10-20 parts of water, adding the cement and the water into a stirring pot, stirring the mixture into slurry, adding the treated coarse aggregate and fine aggregate, and stirring the mixture for 1-3 minutes;
4) then adding the rest cement, the higher soil, the nickel slag powder, the mineral powder and the fiber pipe, carrying out dry stirring for 1 minute, then adding the rest water and the water reducing agent, and continuing stirring for 1-2 minutes;
5) filling the concrete obtained in the step 3) into an iron mold, and standing for 1-3 hours;
6) moving the concrete in the step 4) to a steam curing room, heating to 40-60 ℃ according to the heating rate of 20 ℃/hour, preserving heat for 5-10 hours, and then cooling to room temperature according to the cooling rate of 20 ℃/hour;
7) and removing the mold and performing wet curing for 1-7 d.
CN202111238423.3A 2021-10-25 2021-10-25 Steam-cured concrete and preparation method thereof Pending CN114057445A (en)

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Application publication date: 20220218