CN114195465A - Steam-curing-free concrete for C40 prefabricated part and preparation method thereof - Google Patents
Steam-curing-free concrete for C40 prefabricated part and preparation method thereof Download PDFInfo
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- CN114195465A CN114195465A CN202111600794.1A CN202111600794A CN114195465A CN 114195465 A CN114195465 A CN 114195465A CN 202111600794 A CN202111600794 A CN 202111600794A CN 114195465 A CN114195465 A CN 114195465A
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- 239000004567 concrete Substances 0.000 title claims abstract description 72
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000000463 material Substances 0.000 claims abstract description 31
- 239000004568 cement Substances 0.000 claims abstract description 24
- 239000010881 fly ash Substances 0.000 claims abstract description 23
- 239000004576 sand Substances 0.000 claims abstract description 22
- 239000011398 Portland cement Substances 0.000 claims abstract description 20
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 20
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 238000012360 testing method Methods 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 13
- 239000004575 stone Substances 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 10
- 239000002253 acid Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000009736 wetting Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 8
- 230000007306 turnover Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 12
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012669 compression test Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000011178 precast concrete Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
-
- 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
- C04B28/06—Aluminous 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- 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 a steam-curing-free concrete for C40 prefabricated parts and a preparation method thereof, wherein the concrete comprises the following raw materials in parts by mass per cubic meter: 315 parts of Portland cement 305-containing material, 8-16 parts of sulphoaluminate cement, 52-55 parts of fly ash, 5-7 parts of anhydrous sodium sulfate, 1040 parts of pebble 1020-containing material, 830 parts of medium sand 810-containing material, 4.3-4.7 parts of water reducing agent and 165 parts of water 145-containing material, wherein the 1d compressive strength of the concrete prepared from the materials is more than 23.3 MPa. The non-autoclaved concrete can improve the early strength of the concrete, has good construction performance, can improve the turnover rate of a mould, quickens the production progress and shortens the construction period, and has wide raw material sources and reasonable price.
Description
Technical Field
The invention belongs to the field of concrete prefabricated parts, and particularly relates to a steam-curing-free concrete for a C40 prefabricated part and a preparation method thereof.
Technical Field
In recent years, with the development of building industrialization, precast concrete members are increasingly used in the field of building industry. Compared with a cast-in-place structure, the prefabricated part can ensure the construction quality, accelerate the project progress, reduce dust on the construction site and generate less construction waste.
At present, most prefabricated parts adopt a steam curing mode to improve the early strength of concrete, so that the turnover rate of a mould and the yield of the prefabricated parts are improved. Although steam curing can improve the early strength of concrete, the steam curing also has some disadvantages, such as influence on the later strength and durability of concrete, generation of greenhouse gases and harmful gases, resource waste and the like, and is contrary to the double-carbon target put forward in China.
In the prior art, the chinese invention patent 201811562677.9 discloses a radiation-proof C40 concrete for prefabricated parts, which is prepared by mixing cement, fly ash, river sand, crushed stone, an additive, an expanding agent and water, and comprises the following components in parts by weight: 200-300 parts of cement, 120-210 parts of fly ash, 1100-1200 parts of broken stone, 700-750 parts of river sand, 140-160 parts of water, 7-10 parts of an additive and 20-40 parts of an expanding agent. The radiation protection performance has been highlighted in this patent technique, but still needs the later stage maintenance, carries out the maintenance of keeping warm and moisturizing through spraying concrete evaporation reducing agent, cover plastic film and insulation material, still needs real time monitoring temperature etc to just can dismantle the mould after the difference in temperature is less than 20 degrees centigrade inside and outside needs, and carry out follow-up cover maintenance. Besides the complicated operation of the steam curing step, the crack is difficult to effectively ensure.
Disclosure of Invention
Aiming at the problems and achieving the aim of green and low carbon, the invention develops the steam-curing-free concrete for the prefabricated part with reasonable price. The steam-curing-free concrete does not need steam curing operation except for improved early strength so as to meet the requirement of rapid demoulding and improve the service efficiency of the mould.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention firstly provides a steam-curing-free concrete for C40 prefabricated parts, which comprises the following raw materials in parts by mass per cubic meter: 315 portions of Portland cement 305-containing material, 8-16 portions of sulphoaluminate cement, 52-55 portions of fly ash, 5-7 portions of anhydrous sodium sulfate, 1040 portions of pebble 1020-containing material, 830 portions of medium sand 810-containing material, 4.3-4.7 portions of water reducing agent and 165 portions of water 145-containing material.
The performance parameters of the composition materials are as follows:
the strength grade of the portland cement is more than or equal to 42.5 Mpa;
the strength grade of the sulphoaluminate cement is more than or equal to 42.5 MPa;
the fly ash is grade II fly ash;
the pH value of the anhydrous sodium sulfate is 5.0-8.0;
the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is 15%;
the medium sand is natural river sand, and the fineness modulus of the medium sand is 2.4-2.6;
the pebbles are continuous graded broken stones, and the particle size of the pebbles is 5mm-20 mm.
The 1d compressive strength of the concrete prepared from the materials is 23.3MPa, but if only the concrete of which the portland cement and the fly ash form the cementing material, the 1d compressive strength is only 16.1 MPa; compared with the concrete only comprising the cementing material consisting of the Portland cement and the fly ash, the 1d compressive strength of the concrete prepared from the material is increased by 45% under the same condition, and the requirement of steam curing prevention of the concrete during the manufacturing of C40 concrete prefabricated parts is met.
The invention also provides a preparation method of the non-autoclaved concrete for the C40 prefabricated part, which comprises the following implementation steps:
step one, weighing 315 parts of Portland cement 305-containing material, 8-16 parts of sulphoaluminate cement, 52-55 parts of fly ash, 5-7 parts of anhydrous sodium sulfate, 1040 parts of pebble 1020-containing material, 830 parts of medium sand 810-containing material, 4.3-4.7 parts of water reducing agent and 165 parts of water 145-containing material according to a predetermined proportion;
step two, pouring the stones, the sand and half of the water weighed in the step one into a stirrer, and after stirring for 15-30 s, completely wetting the aggregate;
pouring the portland cement, the sulphoaluminate cement, the fly ash and the anhydrous sodium sulfate which are weighed in the step one, the remaining water and the water reducing agent into a stirrer, and stirring for 2-4 min to obtain a concrete mixture;
and step four, pouring the concrete mixture prepared in the step three into a test mold of a prefabricated member twice, pouring the mixture into the test mold to half of the height of the test mold for the first time, vibrating, pouring the rest concrete material into the test mold for the second time, vibrating and leveling again, removing the mold after 1d, controlling the temperature difference of the inner surface of the concrete to be less than or equal to 25 ℃, and performing film covering and curing for 28-56 d to obtain the C40 non-autoclaved concrete member. In the process, if the temperature difference of the inner surface of the concrete is more than 25 ℃, the concrete is placed for 12 hours and then is subjected to film covering maintenance.
Compared with the prior art, the invention has the following beneficial effects:
1. the cement in the non-autoclaved concrete for the prefabricated part is compounded by adopting the Portland cement and the sulphoaluminate cement, wherein the mass ratio of the sulphoaluminate cement to the Portland cement is 1: 20-38, and the sulphoaluminate cement is a main mineral of the sulphoaluminate cement, has the advantages of low calcium, low alkali, high early strength and the like, can improve the performance of the cement and reduce the carbon emission after replacing part of clinker in the Portland cement, and can improve the early strength of the concrete.
2. According to the steam-curing-free concrete for the prefabricated part, sodium sulfate is added, so that sufficient sulfate ions are provided while hydration is promoted, the trisulfide type hydrated calcium sulphoaluminate is generated, the generation of the monosulfide type hydrated calcium sulphoaluminate is inhibited, and the stability of later strength is improved.
3. The steam-curing-free concrete for the prefabricated part improves the early strength of the concrete, has good construction performance, can improve the turnover rate of a mould, quickens the production progress and shortens the construction period, and has wide raw material source and reasonable price.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention. Technical solutions between the following embodiments can be combined with each other, but must be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The embodiment is a non-autoclaved concrete for C40 prefabricated parts, which comprises the following components in parts by weight:
TABLE 1C 40 non-autoclaved concrete Material composition parts by weight
The compositions listed in table 1 meet the following criteria:
portland cement with strength grade not less than 42.5 MPa; the strength grade of the sulphoaluminate cement is more than or equal to 42.5 MPa; fly ash, class II fly ash; the pH value of the anhydrous sodium sulfate is 5.0-8.0; the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is 15%; the sand is natural river sand, and the fineness modulus is 2.4-2.6; the stone is continuous graded broken stone with particle size of 5-20 mm.
The preparation method of the non-autoclaved concrete of this embodiment C40 includes the following steps:
step one, weighing the portland cement, the sulphoaluminate cement, the fly ash, the anhydrous sodium sulfate, the pebbles, the water, the sand and the water reducing agent in each embodiment according to a preset proportion.
And step two, pouring the stones, the sand and half of the water weighed in the step one into a stirrer, and stirring for 15s to completely wet the aggregate.
And step three, pouring the portland cement, the sulphoaluminate cement, the fly ash and the anhydrous sodium sulfate which are weighed in the step one, the remaining water and the water reducing agent into a stirrer, and stirring for 2 min.
And step four, pouring the prepared concrete mixture into a test mold of a prefabricated member twice, pouring the mixture into the test mold to half of the height of the test mold for the first time, vibrating, pouring the rest concrete material into the test mold for the second time, vibrating again, leveling for 1d, then removing the mold, strictly controlling the temperature difference of the inner surface of the concrete to be less than or equal to 25 ℃, and carrying out film covering and curing for 28-56 d to obtain the C40 non-autoclaved concrete member.
And stirring, compacting and molding according to the procedures specified in GB/T50081-2019 'test method standard for physical and mechanical properties of concrete', and carrying out compression test on the cubic concrete specimen. The compressive strengths of the concretes 1d and 28d prepared in the respective examples are shown in Table 2.
TABLE 2 concrete compressive strength results obtained in each example
| Examples | Numbering | 1d compressive strength/Mpa | 28d compressive strength/Mpa |
| Example 1 | A1 | 23.1 | 48.2 |
| Example 2 | A2 | 22.9 | 47.6 |
| Example 3 | A3 | 21.1 | 46.2 |
| Example 4 | A4 | 22.5 | 46.7 |
| Example 5 | A5 | 23.3 | 48.8 |
Comparative examples
In order to verify the reasonability of the formula, the weight parts of the components are adjusted, and a comparison test is carried out. The raw materials used in the comparative tests comprise the following parts by weight:
TABLE 3 comparative test No-curing concrete material component parts by weight
The compositions listed in Table 3 meet the following criteria:
portland cement with strength grade not less than 42.5 MPa; the strength grade of the sulphoaluminate cement is more than or equal to 42.5 MPa; fly ash, class II fly ash; the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is 15%; the sand is natural river sand, and the fineness modulus is 2.4-2.6; the stone is continuous graded broken stone with particle size of 5-20 mm.
The preparation method of the non-autoclaved concrete of this embodiment C40 includes the following steps:
weighing portland cement, sulphoaluminate cement, fly ash, stones, water, sand and a water reducing agent in each proportion according to a preset proportion;
step two, pouring the stones, the sand and half of the water weighed in the step one into a stirrer, and after stirring for 15s, completely wetting the aggregate;
and step three, pouring the portland cement, the sulphoaluminate cement, the fly ash and the anhydrous sodium sulfate which are weighed in the step one, the remaining water and the water reducing agent into a stirrer, and stirring for 2 min.
And step four, pouring the prepared concrete mixture into a test mold twice, removing the mold after 1d, strictly controlling the temperature difference of the inner surface of the concrete to be less than or equal to 25 ℃, and covering and maintaining for 28 d.
And stirring, compacting and molding according to the procedures specified in GB/T50081-2019 'test method standard for physical and mechanical properties of concrete', and carrying out compression test on the cubic concrete specimen. The compressive strengths of the concretes 1d and 28d prepared in the respective comparative examples are shown in Table 4.
TABLE 4 Table of concrete compressive strength results obtained from comparative tests
| Comparative example | Numbering | 1d compressive strength/Mpa | 28d compressive strength/Mpa |
| Comparative example 1 | B1 | 16.1 | 45.2 |
| Comparative example 2 | B2 | 16.5 | 45.7 |
| Comparative example 3 | B3 | 16.9 | 44.6 |
| Comparative example 4 | B4 | 15.3 | 43.5 |
| Comparative example 5 | B5 | 14.5 | 42.5 |
From the test data of the above 5 examples and 5 comparative examples, it can be seen that: the addition of the sulphoaluminate cement and the anhydrous sodium sulfate is beneficial to improving the early strength of the concrete, and meanwhile, the development of the later strength is stable, thereby ensuring the service performance of the concrete.
In conclusion, the non-autoclaved concrete disclosed by the invention has the advantages that the raw materials are wide in source and reasonable in price, and the demoulding requirement can be met after 1d of natural curing, so that the turnover rate of a mould is improved, and the yield of components is increased; and the later strength development is stably developed, thereby providing guarantee for the quality of the precast concrete member. The non-steam-curing concrete can obtain higher early strength without steam curing conditions, reduces the emission of greenhouse gases and harmful gases, assists the double-carbon target and promotes the construction of an environment-friendly society.
The above embodiments are merely preferred embodiments of the present invention, and any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (5)
1. The non-curing concrete for the C40 prefabricated member is characterized in that the concrete comprises the following raw materials in parts by mass per cubic meter: 315 portions of Portland cement 305-containing material, 8-16 portions of sulphoaluminate cement, 52-55 portions of fly ash, 5-7 portions of anhydrous sodium sulfate, 1040 portions of pebble 1020-containing material, 830 portions of medium sand 810-containing material, 4.3-4.7 portions of water reducing agent and 165 portions of water 145-containing material; the 1d compressive strength of the concrete prepared from the material is more than 23.3 MPa.
2. The non-autoclaved concrete for C40 prefabricated members according to claim 1, wherein the strength grade of Portland cement is 42.5MPa or more, and the strength grade of sulphoaluminate cement is 42.5MPa or more.
3. The non-autoclaved concrete for C40 prefabricated parts according to claim 2, wherein the early strength agent is anhydrous sodium sulfate and has a pH value of 5.0-8.0.
4. The non-autoclaved concrete for C40 prefabricated members according to claim 3, wherein the following composition has the following performance parameters: selecting class II fly ash as the fly ash; the water reducing agent is selected from a polycarboxylic acid water reducing agent, and the water reducing rate is 15%; the sand is natural river sand with fineness modulus of 2.4-2.6; the pebbles are continuous graded broken stones with the particle size of 5mm-20 mm.
5. A preparation method of a non-autoclaved concrete for C40 prefabricated parts, which is used for preparing the concrete of claim 4, and is characterized by comprising the following steps:
step one, weighing 315 parts of Portland cement 305-containing material, 8-16 parts of sulphoaluminate cement, 52-55 parts of fly ash, 5-7 parts of anhydrous sodium sulfate, 1040 parts of pebble 1020-containing material, 830 parts of medium sand 810-containing material, 4.3-4.7 parts of water reducing agent and 165 parts of water 145-containing material according to a predetermined proportion;
step two, pouring the stones, the sand and half of the water weighed in the step one into a stirrer, and after stirring for 15-30 s, completely wetting the aggregate;
pouring the portland cement, the sulphoaluminate cement, the fly ash and the anhydrous sodium sulfate which are weighed in the step one, the remaining water and the water reducing agent into a stirrer, and stirring for 2-4 min to obtain a concrete mixture;
and step four, pouring the concrete mixture prepared in the step three into a test mould twice, pouring the mixture into a test mould for the first time to half of the height of the test mould, vibrating, pouring the rest concrete material into the test mould for the second time, vibrating and leveling again, removing the mould after 1d, controlling the temperature difference of the inner surface of the concrete to be less than or equal to 25 ℃, and performing film covering and curing for 28-56 d to obtain the C40 non-autoclaved concrete member.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116120008A (en) * | 2022-12-29 | 2023-05-16 | 北京住总建筑科技有限公司 | Steam curing-free precast concrete and preparation method thereof |
| CN116354653A (en) * | 2023-04-13 | 2023-06-30 | 山东中岩重科新材料科技有限公司 | Application of PC component concrete raising-free water reducing agent |
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Application publication date: 20220318 |