CN113416090A - Can perform CO2Preparation method of trapped SAP (super absorbent Polymer) hole-containing system breathable mortar - Google Patents
Can perform CO2Preparation method of trapped SAP (super absorbent Polymer) hole-containing system breathable mortar Download PDFInfo
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- CN113416090A CN113416090A CN202110744931.2A CN202110744931A CN113416090A CN 113416090 A CN113416090 A CN 113416090A CN 202110744931 A CN202110744931 A CN 202110744931A CN 113416090 A CN113416090 A CN 113416090A
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 26
- 229920000247 superabsorbent polymer Polymers 0.000 title abstract description 78
- 239000011148 porous material Substances 0.000 claims abstract description 42
- 239000004568 cement Substances 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims abstract description 17
- 239000004576 sand Substances 0.000 claims abstract description 14
- 238000012360 testing method Methods 0.000 claims abstract description 8
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 6
- 238000009792 diffusion process Methods 0.000 claims abstract description 4
- 230000008569 process Effects 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims description 15
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 238000007580 dry-mixing Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 2
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims description 2
- 230000008602 contraction Effects 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 claims 2
- 238000003763 carbonization Methods 0.000 abstract description 19
- 230000035699 permeability Effects 0.000 abstract description 9
- 238000006243 chemical reaction Methods 0.000 abstract description 8
- 229920005646 polycarboxylate Polymers 0.000 abstract 1
- 239000004567 concrete Substances 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 239000002002 slurry Substances 0.000 description 5
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 238000011068 loading method Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- KJFMBFZCATUALV-UHFFFAOYSA-N phenolphthalein Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- 239000005997 Calcium carbide Substances 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000003542 behavioural effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002591 computed tomography Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011381 foam concrete Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Images
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
- C04B28/04—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
- 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
Abstract
The invention provides a method for preparing CO in air2A method for preparing air-permeable mortar containing a captured Super Absorbent Polymer (SAP) pore system. The materials and equipment used by the invention comprise cement, fine sand, a polycarboxylate water reducer, SAP particles, a mortar test mold, a mortar stirrer and a curing box. The air permeability of the mortar is improved by adopting a large amount of SAP. Placing the cured mortar test block in the environment, and capturing CO in the air through the carbonization reaction of the mortar2. The method is simple and effective, and the presence of SAP pores accelerates CO2And (4) diffusion in the mortar. In addition, the method can regulate and control the characteristics of SAP pore system according to the carbonization rate and the characteristics of mortar material, and the SAP particles in the SAP pores can store water when meeting water, thereby providing a proper humidity environment for carbonization reaction, so that the method has the advantages of simple process, low cost and high yieldThe air-permeable mortar prepared by the invention has excellent CO2The capture efficiency.
Description
Technical Field
The invention belongs to the field of cement concrete, and particularly relates to a method for improving CO content in air-permeable mortar by adopting SAP (super absorbent polymer) hole system2The technical field of capture capability; the invention also relates to application of the air-permeable mortar material capable of capturing carbon.
Background
The cement-based material in natural environment can generate carbonization reaction mainly due to calcium hydroxide in pore solution and calcium silicate hydrate in the cement-based material matrix and CO2The reaction produces calcium carbide. Thus, the cement-based material has CO2A capture capability. The carbonation process of cement-based materials is exposed to CO2In the control of the diffusion process, generally, only the surface cement-based material (5-30 mm) is subjected to a carbonization reaction. If the carbonization depth of the cement-based material can be increased, the CO of the cement-based material can be promoted2A capture capability.
SAP can absorb water to expand during the mortar (a type of cement-based material) mixing stage; when the internal humidity of the mortar decreases, the SAP may release moisture and shrink, thereby creating SAP pores. The SAP pores have a large size (0.2-10 mm) and can promote CO in air2Quickly entering the interior of the mortar through the large capillary holes and SAP holes. In addition, the distance (0.5-2 mm) between the SAP holes is small, so that the difficulty of completely carbonizing the mortar between the SAP holes is reduced. Meanwhile, the carbonization of the mortar does not leave water, and the SAP can absorb water and expand when the mortar is in water, so that the water is stored for the mortar carbonization. Normally, the addition of SAP to cement-based materials is aimed at internal curing, in which case the SAP is usually not more than 0.6% by mass of the cementitious material, so that the addition of SAP contributes to the carbon capture of the mortarThe behavioral impact was small and the results of example 2 (table 2) confirm this inference. The invention can play a role in carbon capture, and is characterized by large SAP mixing amount, high mortar water-cement ratio and fine sand selection, thereby generating a pore structure with good air permeability in the mortar.
Document 1(B.park, Y.C.Choi, Investigation of carbon-capture property of foam concrete using stationary steel AOD slab, Journal of Cleaner Production 288(2021):125621) discloses a method for improving the carbon capture capacity of concrete. The method is characterized in that an air entraining agent and steel slag are added into concrete, a large number of air holes are generated in the concrete, and the carbon capture capacity of the concrete is enhanced by improving the porosity of the concrete.
Reference 2(C.Moro, V.Francioso, M.Velay-Lizancos, Modification of CO2 capture and pore structure of hardened cement paste made with nano-TiO2 addition:Influence of water-to-cement ratio and CO2Exposure of Construction and Construction Materials 275(2021): 122131) discloses a method for improving CO capture in hardened cement slurries2Techniques for capabilities. The method utilizes TiO2Changing the porosity of the hardened cement slurry and the activity of calcium hydroxide in the matrix changes the CO of the hardened cement slurry2A capture capability.
The defects of the technology are as follows: (1) in a dry environment, the materials in documents 1 and 2 cannot undergo carbonization reaction due to lack of water. The SAP in the invention can absorb water and swell in a wet environment, so that the mortar keeps high humidity in a dry environment and is carbonized. (2) The materials of documents 1 and 2 have insufficient air permeability, which results in failure to obtain excellent CO from the mortar2The capture efficiency. (3) Document 1 has difficulty in accurately regulating the pore structure of cement-based materials. The air entraining agent generates a pore system that is unstable. Small bubbles have a higher free energy and therefore tend to coalesce to form large bubbles. Since the density of the air bubbles is less than that of the concrete, the air bubbles have a tendency to detach from the concrete. The air bubbles can be promoted to be separated from the concrete by long-time mixing, bleeding, high temperature, a spraying process and the like, so that the characteristics of an air hole system cannot be accurately regulated and controlled. This also results in the inability to further optimize the concreteCarbon capture capacity. (4) TiO in document 22The mixing amount of the cement paste can improve the CO of the hardened cement paste within a certain range2Capture capacity and its improvement is limited. This is because TiO2Not only can improve the reactivity of calcium hydroxide, but also can reduce the porosity of concrete, the former can improve the carbonization efficiency, and the latter can inhibit the carbonization reaction. TiO 22Too much or too little CO, which in turn may cause hardening of the cement paste2The capturing capacity is reduced.
Disclosure of Invention
In order to make up for the defects of the existing testing technology, the invention provides a design method of an SAP pore system, and the SAP pore system is formed by designing the SAP doping mode, the SAP doping amount, selecting fine sand and improving the mortar water-cement ratio2A preparation method of air-permeable mortar with catching capacity.
The technical scheme of the invention is as follows:
can perform CO2The preparation method of the trapped SAP pore-containing system breathable mortar comprises the following steps:
1) and (3) putting the P & O42.5 cement and the dried acrylic acid crosslinked acrylamide SAP particles into a mortar stirrer, and dry-mixing until the two are uniformly mixed.
2) Adding fine sand, continuously stirring the fine sand and the material until the material is uniform, and then adding mixing water in which a polycarboxylic acid high-performance water reducing agent is dissolved. The mortar was mixed according to GBT 8077 and 2012 standards.
3) And after the SAP absorbs water and expands and the working performance of the mortar is stable, placing the mortar containing the SAP in a test mold for molding. The mortar was demolded after hardening and cured in a curing box (temperature 20. + -. 2 ℃ C., humidity > 95%). The reduction of humidity inside the mortar during curing causes the SAP particles to shrink and create a SAP pore system.
4) The SAP pore system with different characteristics can be obtained by changing the mixing amount and the water absorption capacity of the SAP in the mortar.
5) The presence of the SAP pore system reduces CO by placing the cured mortar coupon in the environment2Difficulty of diffusion in mortar, thereby improving CO of mortar2The capture efficiency.
The preferred scheme in the above method is as follows:
the SAP in step 1) is added in a manner of dry mixing with cement to avoid agglomeration of SAP particles when mixed with water.
The mixing amount of the SAP in the step 1) is 2-5% of the mass of the cement, and the SAP with large mixing amount is used for improving the air permeability of the mortar.
In the step 2), the particle size range of the fine sand is 0.5-2mm, and the fine sand is selected to avoid the air permeability reduction of the mortar caused by large-particle aggregates.
The water-to-glue ratio of the mortar prepared in the step 2) is 0.5-0.8. The higher water-to-glue ratio ensures the uniform and good air permeability of the mortar.
The size range of the SAP holes in the step 4) is 0.2-10 mm.
The distance between the SAP holes in the step 4) is 0.5-2 mm.
The invention also relates to CO using SAP pore systems2Application of capture.
Increase of mortar CO2The key of the catching capacity is to improve the air permeability of the mortar and further reduce CO2Difficulty in conveying in the mortar and promotion of carbonization reaction of the mortar. The present study exploits the expansion and contraction behavior of SAPs to introduce SAP pore systems into concrete. Because the compatibility of the SAP and mortar is good, the SAP is mixed in a mode of being uniformly dry-mixed with cement, and then fine sand and mixing water are added to prepare the mortar. Meanwhile, fine river sand particles are adopted to improve the water-cement ratio of the mortar, so that the air permeability of the mortar is further enhanced. Therefore, the method is simple to operate. The spacing between SAP pores and the size of SAP pores can be controlled by varying the particle size, water absorption capacity, and loading of dry SAP particles, thereby allowing deep design of SAP pore system characteristics to achieve CO2Efficient capture of (a) provides a viable technology.
The invention has the following characteristics and excellent effects:
(1) the test method is simple and easy to operate, and the SAP particles can be directly mixed with the raw materials.
(2) By introducing SAP holes, increasing the water-to-glue ratio and adopting fine sand, the air permeability of the mortar can be obviously improved.
(3) The designability of SAP pore system is strong, and the interval between SAP pores and the size of SAP pores can be adjusted and controlled by changing the grain diameter, water absorption capacity and mixing amount of dry SAP particles.
(4) In the dry-wet alternative environment, the SAP shrunk in the SAP holes can absorb water and expand in the wet stage and provide water for the mortar in the dry stage, so that the inside of the mortar is kept at high humidity, and the CO of the mortar in the dry stage is promoted2The capture efficiency.
Drawings
FIG. 1a is a SAP pore system (dark color SAP pore wall, light color mortar matrix) in a hardened cement slurry;
FIG. 1b is a three-dimensional view of SAP pores.
Detailed Description
Example 1 three-dimensional topography of SAP pore systems in mortar, see FIGS. 1a and 1 b.
Placing the cement and the SAP particles into a mortar stirrer for dry mixing for 2 minutes, then adding the fine sand and continuing to dry mix for 2 minutes, slowly adding mixing water dissolved with a water reducing agent, and continuously stirring until the slurry is uniform. The water-cement ratio of the mortar is 0.6, and the mixing amount of the SAP is 2 percent of the mass of the cement. Pouring the stirred mortar into a test mold, and then curing in a curing box for 28 days. The three-dimensional morphology of the pore system of SAP was tested with the aid of an X-ray computed tomography tester, the results of which are shown in fig. 1. As can be seen in FIG. 1, SAP creates a SAP pore system in the mortar.
Example 2 CO with SAP pore system air-permeable mortar2Evaluation of Capture efficiency
Mortars of different SAP contents (0%, 0.3%, 1%, 2%, 3%, 4% and 5%) were prepared as in example 1 and cured for 28 days under standard conditions after mortar formation. Then carrying out carbonization experiment according to GBT 50082-2009 (standard of test method for long-term performance and durability of common concrete), and carrying out CO carbonization experiment2The concentration of (2) is 20%. After 28 days of carbonization, the test block is separated into two parts by adopting a Brazilian splitting method, and then phenolphthalein alcohol solution with the concentration of 1% is sprayed on the test block, and the carbonization depth is determined according to the limit of the color change range. The final carbonization results are shown in the following table. As can be seen from Table 1, the carbonization depth continuously increases with the increase of the amount of SAP only when the amount of SAP added reaches 2%, while the addition of a small amount of SAP has little effect on the carbon capture behavior of the mortar. Table 1 also illustrates that the introduction of a high loading SAP pore system can significantly improve the mortarCO of2The capture efficiency proves the effectiveness of the invention.
TABLE 1 carbonization depth (mm) of mortar with different SAP loadings
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A preparation method of SAP pore system air-permeable mortar capable of capturing CO2 comprises the following steps:
1) placing the cement and the dry SAP particles into a mortar stirrer for dry mixing until the cement and the dry SAP particles are uniformly mixed;
2) adding fine sand, continuously stirring the fine sand and the raw materials until the raw materials are uniformly mixed, and then adding mixing water in which a water reducing agent is dissolved;
3) after the SAP absorbs water and expands and the mortar has stable working performance, placing the mortar containing the SAP in a test mold for molding, demolding after the mortar is hardened, and maintaining in a maintenance box, wherein the SAP particles shrink and an SAP hole system is generated due to the reduction of the internal humidity of the mortar in the maintenance process;
4) SAP pore systems with different characteristics can be obtained by changing the mixing amount and the water absorption capacity of SAP in the mortar;
5) the presence of the SAP pore system reduces CO by placing the cured mortar coupon in the environment2Difficulty of diffusion in mortar, thereby increasing CO2The capture efficiency of (1).
2. The method for preparing air-permeable mortar containing SAP pore system as claimed in claim 1, wherein the cement selected in step 1) is P.O 42.5 cement; the selected SAP is granular, and the material of the SAP is acrylic acid crosslinked acrylamide; the mixing amount of the SAP is 2-5% of the mass of the cement, and the SAP is added in a mode of being uniformly dry-mixed with the cement.
3. The method for preparing the breathable mortar containing SAP pores according to claim 1, wherein the water reducing agent used in step 2) is a polycarboxylic acid high performance water reducing agent, the water-to-cement ratio of the prepared mortar is 0.5-0.8, and the particle size of the fine sand is 0.5-2 mm.
4. Method for preparing an air-permeable mortar containing SAP pore system according to claim 1, characterized in that the expansion and contraction behavior of SAP in step 3) is used to prepare SAP pore system.
5. The method for preparing the breathable mortar containing SAP pore system of claim 1, wherein the characteristics of the SAP pore system in step 4) can be adjusted by adjusting the water absorption capacity and the amount of the SAP added.
6. The method for preparing the air-permeable mortar containing SAP holes of claim 1, wherein the size of SAP holes in step 4) is in the range of 0.2 to 10mm, and the distance between SAP holes is in the range of 0.5 to 2 mm.
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| CN116199484A (en) * | 2023-04-27 | 2023-06-02 | 石家庄铁道大学 | SAP-containing cement-based aircraft interception material and preparation method thereof |
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| CN116199484B (en) * | 2023-04-27 | 2023-07-07 | 石家庄铁道大学 | SAP-containing cement-based aircraft interception material and preparation method thereof |
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