CN115650663B - Preparation method of ultra-high performance concrete with carbon dioxide as internal curing agent - Google Patents
Preparation method of ultra-high performance concrete with carbon dioxide as internal curing agent Download PDFInfo
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- CN115650663B CN115650663B CN202211272624.XA CN202211272624A CN115650663B CN 115650663 B CN115650663 B CN 115650663B CN 202211272624 A CN202211272624 A CN 202211272624A CN 115650663 B CN115650663 B CN 115650663B
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Abstract
The invention provides a preparation method of ultra-high performance concrete with carbon dioxide as an internal curing agent. The method comprises the following steps: modifying steel fibers by adopting a Polyethyleneimine (PEI) solution with a certain concentration to obtain PEI coated steel fibers; placing PEI coated steel fibers in a carbonization box to capture CO 2 Obtaining captured CO 2 PEI coated steel fibers of (C); adding the dry materials (cement, silica fume, quartz powder and quartz sand) and the dry powder polycarboxylate water reducer into a stirrer, uniformly mixing, and then adding mixing water; adding the captured CO when the mixture is in a moist state 2 PEI coated steel fibers of (C); stopping stirring when the expansion degree of the freshly mixed concrete reaches the requirement. After the fresh concrete is poured, molded and cured, the ultra-high performance concrete taking carbon dioxide as an internal curing agent is obtained through curing. The method of the invention captures and seals CO 2 Meanwhile, the method has the effect of improving the mechanical property of the ultra-high performance concrete, and has certain reference significance for relieving the greenhouse effect and improving the bearing capacity of the ultra-high performance concrete member.
Description
Technical Field
The invention relates to the technical field of building material preparation, in particular to a preparation method of ultra-high performance concrete with carbon dioxide as an internal curing agent.
Background
Concrete as building material with maximum consumption in building field, and CO released from raw material production to concrete forming process 2 Accounting for 5 to 8 percent of the emission of all industries, is an important cause for greenhouse effect and global warming. Slowing down, reducing and even recycling CO when ecological civilization construction is improved to an unprecedented height 2 Meets the requirements of sustainable development strategy.
At present, CO 2 The curing is carried out from the outside of the ordinary concrete as a mineralization source, which is beneficial to the improvement of the mechanical properties of the ordinary concrete. Compared with common concrete with lower compactness, the ultra-high performance concrete is a cement-based composite material with high compactness. If the same external curing method as that of ordinary concrete is adopted, CO 2 It is difficult to penetrate into the ultra-high performance concrete, and the improvement of the mechanical properties of the ultra-high performance concrete is not obvious. At presentNone of the prior art has been effective with CO 2 A preparation method of ultra-high performance concrete used as an internal curing agent.
Disclosure of Invention
The embodiment of the invention provides a preparation method of ultra-high performance concrete with carbon dioxide as an internal curing agent, so as to effectively improve the mechanical properties of the ultra-high performance concrete.
In order to achieve the above purpose, the present invention adopts the following technical scheme.
A preparation method of ultra-high performance concrete with carbon dioxide as an internal curing agent comprises the following steps:
modifying steel fibers by adopting a polyethyleneimine solution with a certain concentration to obtain PEI coated steel fibers;
placing PEI coated steel fibers in a carbonization box to capture CO 2 Obtaining captured CO 2 PEI coated steel fibers of (C);
adding a dry material and a dry powder polycarboxylate water reducer into a stirrer, uniformly stirring, wherein the dry material comprises cement, silica fume, quartz powder and quartz sand, and then adding stirring water; adding the captured CO when the mixture is in a moist state 2 And stopping stirring when the expansion degree of the freshly mixed concrete reaches the requirement. After the fresh concrete is poured, molded and cured, the ultra-high performance concrete taking carbon dioxide as an internal curing agent is obtained through curing.
Preferably, the modifying treatment of the steel fiber by adopting PEI solution with a certain concentration to obtain PEI coated steel fiber comprises the following steps:
preparing a PEI solution with the concentration of 10wt.% and the molecular weight of PEI being 600;
placing a proper amount of steel fibers into a pan, heating the pan by using an electromagnetic oven, and keeping the temperature at about 55-70 ℃; and directly spraying the PEI solution onto the surface of the steel fiber in batches by adopting a spray can with the capacity of 50ml, wherein 1 kilogram of the steel fiber corresponds to 30g of the PEI solution, and stirring the steel fiber by utilizing a stainless steel rake at the same time, and obtaining the PEI coated steel fiber after the water is fully evaporated.
Preferably, the PEI coated steel fiber is placed in a carbonization box to capture CO 2 Obtaining captured CO 2 A PEI coated steel fiber of (2), comprising:
placing PEI coated steel fibers into a carbonization box to capture CO 2 And water for 2h, the temperature of the carbonization box is 20+/-2 ℃, the humidity is 70+/-2%, and CO 2 Turning over PEI coated steel fiber every half hour to obtain captured CO with concentration of 20+ -2% 2 Is coated with PEI steel fibers.
Preferably, the dry material and the dry powder polycarboxylate water reducer are added into a stirrer to be uniformly mixed, wherein the dry material comprises cement, silica fume, quartz powder and quartz sand, and then mixing water is added; adding the captured CO when the mixture is in a moist state 2 And stopping stirring when the expansion degree of the freshly mixed concrete reaches the requirement. After the fresh concrete is poured and formed and kept, curing to obtain the ultra-high performance concrete taking carbon dioxide as an internal curing agent, wherein the ultra-high performance concrete comprises the following components:
the dosage of various raw materials for setting the ultra-high performance concrete is as follows: 800kg/m cement 3 200kg/m of silica fume 3 200kg/m quartz powder 3 880kg/m quartz sand 3 156kg/m of steel fiber 3 180kg/m of mixing water 3 And the dry powder polycarboxylate water reducer is 0.95wt.% of the dosage of the cementing material, the cement is P.II 52.5R type early strength silicate cement, the average grain size of silica fume is 6-8 mu m, and the average grain size of quartz powder is 45 mu m; the particle size of the quartz sand is divided into 0.18-0.42mm and 0.6-1mm, and the mass ratio of the two quartz sand is 2:1; the water reducer is a dry powder polycarboxylate water reducer, and the water reducing rate is 30%;
adding all dry materials and dry powder polycarboxylate water reducer according to the dosage of the raw materials, stirring for 4min in a forced stirrer, wherein the dry materials comprise cement, silica fume, quartz powder and quartz sand, adding stirring water, stirring for 1min, and capturing CO 2 The PEI coating steel fibers are added into a mixer in a dispersing way until the expansion degree of the freshly mixed concrete reaches 500+/-20 mm;
pouring the fresh concrete into a mould for molding, and marking as doping and capturing CO 2 The PEI coated steel fiber ultra-high performance concrete is covered with a plastic film, and is placed in a standard curing room for 1d of curing;
after the fresh concrete is poured and formed and cured, hot water curing is carried out for 2d at 90 ℃ or combined curing is carried out, wherein the combined curing comprises hot water curing at 90 ℃ for 2d+200 ℃ and dry heat curing for 3d, and the ultra-high performance concrete taking carbon dioxide as an internal curing agent is obtained.
As can be seen from the technical scheme provided by the embodiment of the invention, the preparation method of the ultra-high performance concrete taking carbon dioxide as the internal curing agent of the embodiment of the invention captures and seals CO 2 Meanwhile, the method has the effect of improving the mechanical property of the ultra-high performance concrete, and has a certain significance for relieving the greenhouse effect and improving the bearing capacity of the ultra-high performance concrete member.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a process flow of a method for preparing ultra-high performance concrete using carbon dioxide as an internal curing agent according to an embodiment of the present invention;
FIG. 2 shows a CO doping and capturing process according to an embodiment of the present invention 2 The PEI coating steel fiber of the concrete has the compressive strength.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and are not to be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
For the purpose of facilitating an understanding of embodiments of the present invention, a specific embodiment will be described below by way of example only with reference to the drawings, and the embodiments are not intended to limit the embodiments of the present invention.
In the embodiment of the invention, CO is pre-added in the concrete preparation process 2 Is introduced into the ultra-high performance concrete as an internal curing agent, and CO is recycled in the curing stage 2 Gradually releasing and hydrating Ca (OH) with cement 2 Or the cement clinker undergoes chemical reaction to finally achieve the purposes of capturing and sealing CO 2 And the compactness of the ultra-high performance concrete matrix is improved, and the mechanical property of the ultra-high performance concrete is improved. CO is processed by 2 The high-performance concrete is introduced into the ultra-high-performance concrete as an internal curing agent, and CO is consumed and stored 2 At the same time as lifting the superThe mechanical property of the high-performance concrete can be achieved by two purposes, and the method has certain reference significance for relieving the greenhouse effect and improving the ultimate bearing capacity of the ultra-high-performance concrete structure.
According to the preparation method of the ultra-high performance concrete with carbon dioxide as an internal curing agent, firstly, a polyethyleneimine solution with a certain concentration is adopted to modify and treat steel fibers, so that PEI coated steel fibers are obtained; placing PEI coated steel fibers in a carbonization box to capture CO 2 Obtaining captured CO 2 PEI coated steel fibers of (C); then adding the dry materials (cement, silica fume, quartz powder and quartz sand) and the dry powder polycarboxylate water reducer into a stirrer, uniformly stirring, and adding the stirring water to enable the mixture to be in a moist state; finally adding captured CO 2 And stopping stirring when the expansion degree of the freshly mixed concrete reaches the requirement. After the test piece is cast and molded, covering the surface of the test piece by a plastic film, and standing for 1d in a standard curing room; after the rest, the ultra-high performance concrete is cured by adopting hot water at 90 ℃ or hot water at 90 ℃ plus dry heat at 200 ℃.
The process flow of the preparation method of the ultra-high performance concrete with carbon dioxide as an internal curing agent provided by the embodiment of the invention is shown in a figure 1, and the detailed steps are as follows:
s10, modification treatment of steel fibers
(1) Preparing PEI solution: preparing a PEI solution with the concentration of 10wt.% and the molecular weight of PEI being 600;
(2) PEI solution treatment of steel fibers: placing a proper amount of steel fibers into a pan, heating the pan by adopting an electromagnetic oven, and keeping the temperature at about 55-70 ℃; spraying PEI solution onto the surface of the steel fiber in batches by using a spray can with the capacity of 50ml, and turning over and stirring by using a stainless steel rake to obtain PEI coated steel fiber; 1 kg of steel fiber corresponds to 30g of PEI solution;
(3)CO 2 capturing: placing PEI coated steel fibers into a carbonization box to capture CO 2 And water for 2h, turning over the fiber every half an hour to obtain captured CO 2 PEI coated steel fibers of (C); the temperature of the carbonization box is 20+/-2 ℃, the humidity is 70+/-2 percent, and CO 2 The concentration is 20+/-2%;
s20, preparation of ultra-high performance concrete
(1) Mixing ratio: the consumption of each raw material of the ultra-high performance concrete is as follows: 800kg/m cement 3 200kg/m of silica fume 3 200kg/m quartz powder 3 880kg/m quartz sand 3 156kg/m of steel fiber 3 180kg/m of mixing water 3 The water reducing agent is 0.95wt.% of the dosage of the cementing material (cement, silica fume). Wherein, the cement is P.II 52.5R type early strength silicate cement, the average grain diameter of silica fume is 6-8 mu m, the average grain diameter of quartz powder is 45 mu m, and the grain diameters of quartz sand are 0.18-0.42mm and 0.6-1mm (the mass ratio is 2:1); the water reducer is a dry powder polycarboxylate water reducer, and the water reducing rate is 30%.
(2) Preparing fresh concrete: adding all dry materials (cement, silica fume, quartz powder and quartz sand) and dry powder polycarboxylate water reducer, stirring in a forced stirrer for 4min, adding mixing water, stirring for 1min, and coating unmodified steel fiber, PEI coated steel fiber or capturing CO 2 And (3) the PEI coated steel fibers are added into a stirrer in a dispersing way until the expansion degree of the freshly mixed concrete reaches 500+/-20 mm.
(3) Casting and forming ultra-high performance concrete: the freshly mixed concrete was molded (test pieces 70.7X70.7X70.7 mm in size) 3 ) The samples are marked as CON group (reference group, ultra-high performance concrete doped with unmodified steel fibers), M10 group (ultra-high performance concrete doped with PEI coated steel fibers) or MC10 group (doped with CO captured) 2 PEI coated steel fiber ultra-high performance concrete) and covering the test piece with a plastic film to prevent water loss, and finally placing the test piece in a standard curing room for 1d of rest;
s30, curing of ultra-high-performance concrete
(1) Curing with hot water at 90 ℃): curing the demolded super-high-performance concrete compression-resistant test pieces of the CON group, the M10 group and the MC10 group in hot water at 90 ℃ for 2d;
(2) Combined curing (hot water curing at 90 ℃ 2d+200 ℃ dry heat curing 3 d): putting half compression-resistant test pieces of the CON group, the M10 group and the MC10 group subjected to hot water curing at 90 ℃ into a 200 ℃ oven for curing for 3d;
s40, testing compressive strength of ultra-high performance concrete
Referring to a specified compressive strength test method in the national standard Specification (concrete physical mechanical property test method Standard) (GB/T50081-2019), the compressive strength test speed is 0.8MPa/s;
data processing
(1) The compressive strength of the ultra-high performance concrete cube is calculated according to the following formula:
f in cc -compressive strength of the ultra-high performance concrete cube test piece in MPa;
f, breaking load of the test piece, and N is a unit;
a-area of specimen bearing, unit mm 2 ；
(2) The determination of the intensity value should meet the following specifications:
1) The arithmetic average of the three test piece test values is taken as the strength value (the precision is 0.1 MPa) of the group of test pieces;
2) If one of the maximum value or the minimum value of the three test values is different from the intermediate value by more than 15%, the maximum value and the minimum value are omitted, and the intermediate value is taken;
3) If the differences between the maximum and minimum values and the intermediate value exceed 15% of the intermediate value, the test results for the set of test pieces are invalid.
(3) Compressive strength of ultra-high performance concrete:
the compressive strength of the ultra-high performance concrete is shown in figure 2. As can be seen from FIG. 2, under the Combined Curing (CC) condition, the compressive strengths of the CON group and M10 group ultra-high performance concrete are 199.7MPa and 199.6MPa, respectively, while the compressive strength of the MC10 group ultra-high performance concrete is 238.6MPa, indicating the CO introduced in the MC10 group 2 And the desorption of the moisture is realized under the combined curing condition, and the internal curing effect is generated.
In summary, the preparation method of the ultra-high performance concrete using carbon dioxide as the internal curing agent according to the embodiment of the invention captures and seals CO 2 Meanwhile, the composite material has the effect of improving the mechanical property of the ultra-high performance concrete, and is used for relieving the greenhouse effect and improving the ultra-high performance concrete memberHas a certain reference meaning.
Those of ordinary skill in the art will appreciate that: the drawing is a schematic diagram of one embodiment and the modules or flows in the drawing are not necessarily required to practice the invention.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, with reference to the description of method embodiments in part. The apparatus and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (1)
1. The preparation method of the ultra-high performance concrete with the carbon dioxide as the internal curing agent is characterized by comprising the following steps:
modifying steel fibers by adopting a polyethyleneimine solution with a certain concentration to obtain PEI coated steel fibers;
placing PEI coated steel fibers in a carbonization box to capture CO 2 Obtaining captured CO 2 PEI coated steel fibers of (C);
adding a dry material and a dry powder polycarboxylate water reducer into a stirrer, uniformly stirring, wherein the dry material comprises cement, silica fume, quartz powder and quartz sand, and then adding stirring water; adding the captured CO when the mixture is in a moist state 2 The PEI coating steel fiber is stirred when the expansion degree of the freshly mixed concrete reaches the requirement; after the fresh concrete is poured, molded and cured, curing to obtain ultra-high performance concrete taking carbon dioxide as an internal curing agent;
the PEI solution with a certain concentration is adopted to modify and treat the steel fiber to obtain PEI coated steel fiber, which comprises the following steps:
preparing a PEI solution with the concentration of 10wt.% and the molecular weight of PEI being 600;
placing a proper amount of steel fibers into a pan, heating the pan by using an electromagnetic oven, and keeping the temperature at about 55-70 ℃; spraying the PEI solution onto the surface of the steel fiber in batches by adopting a spray can with the capacity of 50ml, wherein 1 kg of the PEI solution corresponds to 30g of the steel fiber, and stirring the steel fiber by utilizing a stainless steel rake at the same time, and obtaining PEI coated steel fiber after the water is fully evaporated;
the PEI coated steel fiber is placed in a carbonization box to capture CO 2 Obtaining captured CO 2 A PEI coated steel fiber of (2), comprising:
placing PEI coated steel fibers into a carbonization box to capture CO 2 And water for 2h, the temperature of the carbonization box is 20+/-2 ℃, the humidity is 70+/-2%, and CO 2 Turning over PEI coated steel fiber every half hour to obtain captured CO with concentration of 20+ -2% 2 PEI coated steel fibers of (C);
adding a dry material and a dry powder polycarboxylate water reducer into a stirrer, uniformly stirring, wherein the dry material comprises cement, silica fume, quartz powder and quartz sand, and then adding stirring water; adding the captured CO when the mixture is in a moist state 2 The PEI coating steel fiber is stirred when the expansion degree of the freshly mixed concrete reaches the requirement; after the fresh concrete is poured and formed and kept, curing to obtain the ultra-high performance concrete taking carbon dioxide as an internal curing agent, wherein the ultra-high performance concrete comprises the following components:
the dosage of various raw materials for setting the ultra-high performance concrete is as follows: 800kg/m cement 3 200kg/m of silica fume 3 200kg/m quartz powder 3 880kg/m quartz sand 3 156kg/m of steel fiber 3 180kg/m of mixing water 3 And the dry powder polycarboxylate water reducer is 0.95wt.% of the dosage of the cementing material, the cement is P.II 52.5R type early strength silicate cement, the average grain size of silica fume is 6-8 mu m, and the average grain size of quartz powder is 45 mu m; the particle size of the quartz sand is divided into 0.18-0.42mm and 0.6-1mm, and the mass ratio of the two quartz sand is 2:1; the water reducer is a dry powder polycarboxylate water reducer, and the water reducing rate is 30%;
adding all dry materials and dry powder polycarboxylate water reducer according to the dosage of the raw materials, stirring for 4min in a forced stirrer, wherein the dry materials comprise cement, silica fume, quartz powder and quartz sand, adding stirring water, stirring for 1min, and capturing CO 2 The PEI coating steel fibers are added into a mixer in a dispersing way until the expansion degree of the freshly mixed concrete reaches 500+/-20 mm;
pouring the fresh concrete into a mould for molding, and marking as doping and capturing CO 2 The PEI coated steel fiber ultra-high performance concrete is covered with a plastic film, and is placed in a standard curing room for 1d of curing;
after the fresh concrete is poured and formed and cured, hot water curing is carried out for 2d at 90 ℃ or combined curing is carried out, wherein the combined curing comprises hot water curing at 90 ℃ for 2d+200 ℃ and dry heat curing for 3d, and the ultra-high performance concrete taking carbon dioxide as an internal curing agent is obtained.
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| CN1314482C (en) * | 2004-12-09 | 2007-05-09 | 中山大学 | Multiamine absorbed fiber and its preparation method and use |
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