CN116041011A - Anti-freezing concrete containing micro-nano SAP holes and preparation method thereof - Google Patents
Anti-freezing concrete containing micro-nano SAP holes and preparation method thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 238000007710 freezing Methods 0.000 title description 13
- 239000004568 cement Substances 0.000 claims abstract description 23
- 230000002528 anti-freeze Effects 0.000 claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims description 42
- 239000002245 particle Substances 0.000 claims description 42
- 239000010959 steel Substances 0.000 claims description 42
- 239000000463 material Substances 0.000 claims description 34
- 238000000227 grinding Methods 0.000 claims description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 238000005242 forging Methods 0.000 claims description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- 229920003086 cellulose ether Polymers 0.000 claims description 13
- 239000004576 sand Substances 0.000 claims description 13
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 11
- 239000003638 chemical reducing agent Substances 0.000 claims description 9
- 239000010881 fly ash Substances 0.000 claims description 9
- KEZYHIPQRGTUDU-UHFFFAOYSA-N 2-[dithiocarboxy(methyl)amino]acetic acid Chemical compound SC(=S)N(C)CC(O)=O KEZYHIPQRGTUDU-UHFFFAOYSA-N 0.000 claims description 8
- YDEXUEFDPVHGHE-GGMCWBHBSA-L disodium;(2r)-3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Na+].[Na+].COC1=CC=CC(C[C@H](CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O YDEXUEFDPVHGHE-GGMCWBHBSA-L 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 8
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 7
- 239000011707 mineral Substances 0.000 claims description 7
- 229920005646 polycarboxylate Polymers 0.000 claims description 7
- 238000007580 dry-mixing Methods 0.000 claims description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 5
- 239000004575 stone Substances 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 3
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 3
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 3
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 3
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 2
- 229920001479 Hydroxyethyl methyl cellulose Polymers 0.000 claims description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 2
- 239000011325 microbead Substances 0.000 claims description 2
- 229910021487 silica fume Inorganic materials 0.000 claims description 2
- 239000002893 slag Substances 0.000 claims description 2
- 239000011398 Portland cement Substances 0.000 claims 1
- 239000004566 building material Substances 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 17
- 239000003795 chemical substances by application Substances 0.000 description 14
- 238000010257 thawing Methods 0.000 description 11
- 230000008014 freezing Effects 0.000 description 10
- 239000011148 porous material Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000003469 silicate cement Substances 0.000 description 2
- 230000004580 weight loss Effects 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000004205 dimethyl polysiloxane Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 239000003949 liquefied natural gas Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 1
- -1 polydimethylsiloxane Polymers 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000001132 ultrasonic dispersion 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
- C04B28/04—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
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of cement-based building materials, in particular to an antifreeze concrete containing micro-nano SAP holes and a preparation method thereof.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to an antifreezing concrete containing micro-nano SAP holes and a preparation method thereof.
Background
In many areas of China, the temperature is extremely low in winter, and in the engineering of ports, highways, bridges, tunnels, liquefied natural gas storage tanks (the internal temperature is-165 ℃) and the like in the alpine areas, many buildings can be subjected to freeze thawing damage, so that the buildings have higher requirements on the frost resistance of the concrete. The introduction of air holes in concrete is a common technical measure for improving the frost resistance of concrete. However, the concrete has certain requirements on the introduced air holes, and the closed, tiny and stable air holes can improve the frost resistance of the concrete, and the introduced air holes have large aperture, small quantity, overlarge spacing coefficient and the like, which are not beneficial to improving the frost resistance of the concrete.
Document 1 (Liang Wenquan, luo Xiangyu, he Jinrong, jin Xueli, tan Jianjun. Study on the freeze resistance of high-doped air entraining agent concrete in alpine dry areas [ J ]. Concrete, 2005,000 (001): 27-32) discloses a method for improving the freeze resistance of concrete by curing a concrete specimen having a size of 100mm x 400mm in a standard environment for 28 days, wherein the doping amount of the air entraining agent is 0.65-0.70% of the mass of the concrete, performing a freeze thawing test, performing two cycles per day, and testing the freeze elasticity modulus and weight loss of the concrete after 0, 50, 100, 150, 200, 250 and 300 freeze thawing cycles, thereby evaluating the influence of the air entraining agent on the freeze resistance of the concrete. Document 2 (Zhang Bo, li Qi ngbi n, ni u Xuj i ng, yang Lin, hu Yu, zhang J in l iang. Inf l uence of a nove l hydrophobic agent on freeze-thaw resi stance and microstructure of concrete [ J ]. Construct ion and Bu i l di ng Mater i a l s,2021, 269:121294) discloses a method for improving the frost resistance of concrete. The method adopts silane coupling agent and polydimethylsiloxane to carry out surface treatment on mica powder to prepare a novel hydrophobe, the novel hydrophobe is added into concrete to prepare a concrete test piece with the thickness of 100mm multiplied by 400mm, the concrete test piece is cured for 28d under standard conditions, a KDS-28 concrete quick freezing and thawing test machine is adopted to carry out freezing and thawing cycle test, the center temperature of the test piece is-18+/-2-10+/-2 ℃, and the influence of the novel hydrophobe on the freezing resistance of the concrete is evaluated by measuring the relative dynamic elastic modulus of a test block.
However, the above-described technique has disadvantages in that: (1) The pore structure of the cement-based material is difficult to accurately regulate and control in the document 1, the pore system generated by the air entraining agent is unstable, the free energy of small bubbles generated by the air entraining agent is high, the small bubbles tend to be combined into large bubbles, in addition, the bubbles have a tendency to be separated from the concrete because the density of the bubbles is smaller than that of the concrete, and a large amount of bubbles can be lost in the process of mixing, bleeding and high temperature spraying the concrete for a long time by adding the air entraining agent, so that the characteristic of the pore system in the concrete cannot be accurately regulated and controlled by the air entraining agent, and the frost resistance of the concrete cannot be further optimized. (2) The air entraining agent of document 1 reduces the strength of concrete because the workability of concrete can be changed by adding the air entraining agent under the condition of low water-cement ratio, and the frost resistance of concrete is improved, but as the water-cement ratio of concrete increases, the porosity of concrete increases, and the strength of concrete is reduced. (3) The preparation process of the novel hydrophobizing agent in the document 2 is complicated, the cost is high, and the environment is polluted to a certain extent due to the fact that fluorine is contained in the hydrophobizing agent. (4) The coating formed by the water repellent agent on the surface of the concrete in document 2 has poor mechanical stability and is easily scratched and damaged, which reduces the water repellency of the concrete, and thus results in the deterioration of the frost resistance of the concrete. (5) The novel hydrophobizing agent disclosed in document 2 can reduce the content of mesopores and macropores, but has a limited adjusting range of porosity, so that the frost resistance of concrete is difficult to be obviously improved.
The SAP is used as a cement-based material additive, and absorbs water and expands in the concrete mixing stage, when the humidity in the concrete is reduced, the SAP can release water and shrink, so that SAP holes are generated, the current application of the SAP in the cement-based material is mainly to reduce the shrinkage of the cement-based material by utilizing the water absorption-water release characteristics of the SAP, so that the mechanical property is improved by internal curing, but the study on the freezing resistance of the cement-based material is less, the inventor pays attention to the SAP for many years, and researches find that if micro-nano SAP holes with the size of 600nm-20 mu m and the hole spacing of 100nm-50 mu m are introduced, and the hole systems are similar to air hole systems, enough space is provided for volume expansion of the water in the concrete when the water is frozen, so that the freezing resistance of the concrete is improved. In addition, the stability of the micro-nano SAP pore system is obviously better than that of a gas pore system, and the micro-nano SAP pore system can also accurately adjust the size and the spacing of the micro-nano SAP pore by changing the size, the doping amount and the water absorption capacity of the micro-nano SAP, so that the frost resistance of the concrete is obviously improved.
Disclosure of Invention
The invention provides an antifreeze concrete containing micro-nano SAP holes, which is prepared by introducing micro-nano SAP particles prepared by grinding by a two-stage special process, and the micro-nano SAP holes are introduced to improve the antifreeze property of the concrete.
Specifically, the antifreeze concrete containing micro-nano SAP holes comprises the following raw materials:
200-600kg/m of cement 3 50-200kg/m of admixture 3 The sand ratio is 38-46%, the water-gel ratio is 0.3-0.45, the polycarboxylate water reducer is 3-5% of the mass of the cementing material, the cellulose ether is 0.03-0.2% of the mass of the cementing material, the micro-nano SAP particles are 0.3-1% of the mass of the cementing material,
wherein, the preparation steps of the micro-nano SAP particles are as follows:
1) Adding SAP particles into a ball mill adopting a first steel forging grinding bin and a second steel ball grinding bin for primary grinding to obtain primary grinding fine materials,
2) Adding the primary grinding fine materials, sodium metasilicate pentahydrate and sodium lignin sulfonate into a mill adopting zirconia balls for fine grinding, and obtaining the micro-nano SAP particles.
Preferably, the ratio of the steel forging in the step 1) is as follows: phi 25 multiplied by 30mm steel forging 30-50%, phi 15 multiplied by 20mm steel forging 50-70%; the proportion of the steel balls is 15-20% of 20mm steel balls, 40-50% of 15mm steel balls and 20-40% of 5mm steel balls.
Preferably, the initial grinding time in the step 1) is 30-50min.
Preferably, in the step 2), the mass ratio of the primary grinding fine materials, the sodium metasilicate pentahydrate and the sodium lignin sulfonate is 100:0.5-1.5:2-5, the diameter of the zirconia balls is 2mm, and the fine grinding time is 50-70min.
Preferably, the SAP particles are acrylic cross-linked acrylamide type SAP with a particle size of 200-1000 μm and the micro-nano-sized SAP particles have a particle size of 0.3-5 μm.
The particle size of the common SAP particles is different, agglomeration is easy to occur during concrete mixing, the dispersibility is poor, the prior art generally adopts measures such as prolonging the stirring time, ultrasonic dispersion and the like to improve the dispersibility of the SAP particles, and the pore forming effect of the SAP particles in the concrete is difficult to ensure.
Preferably, the cement is at least one of silicate cement, ordinary silicate cement, sulphoaluminate cement and ferro-aluminate cement.
Preferably, the admixture is at least one of fly ash, mineral powder, steel slag micropowder, silica fume and fly ash microbeads.
Preferably, the sand adopts river sand with mud content not more than 2%, the stone adopts broken stone, and the grain size is 5-16mm.
Preferably, the cellulose ether is at least one of hydroxypropyl methyl cellulose ether and hydroxyethyl methyl cellulose ether. The addition of cellulose ether can raise the viscosity of concrete and avoid slurry segregation.
The invention also relates to a preparation method of the antifreeze concrete, which is characterized by comprising the following steps:
a. dissolving a water reducing agent and cellulose ether in water to prepare an additive aqueous solution,
b. adding micro-nano SAP particles, cement and admixture into a concrete mixer, uniformly mixing, adding sand and stones for dry mixing,
c. adding the admixture aqueous solution into the concrete mixer, and continuing mixing, forming and curing to obtain the antifreeze concrete containing the micro-nano SAP holes.
Preferably, the curing process comprises the following steps: and (3) demoulding after the concrete test piece is molded for 2 hours, and then placing the concrete test piece into a curing box, and curing for 28 days at the temperature of 20+/-2 ℃ and the humidity of more than 95%.
The research of the invention shows that the dry mixing doping mode of the micro-nano SAP particles has better anti-freezing effect compared with the pre-saturated wet mixing mode of SAP, and the micro-nano SAP particles have good dispersibility and can meet the mixing requirement of dry mixing.
According to the invention, artificial holes are introduced into concrete by adding micro-nano SAP particles, so that the frost resistance of the concrete is improved, the micro-nano SAP particles absorb water to expand in the concrete mixing stage, then the humidity in the concrete is reduced, the micro-nano SAP particles release moisture and shrink to form micro-nano SAP holes, the diameter of the introduced micropores is 600nm-20 mu m, the hole spacing is 100nm-50 mu m, and the size, the doping amount and the water absorption capacity of the micro-nano SAP holes can be changed to accurately regulate the sizes and the distances of the micro-nano SAP holes.
The invention has the following technical advantages:
1. the preparation process is simple and the cost is low;
2. the micro-nano SAP particles prepared by the method have concentrated particle size distribution and good dispersing effect, and can be directly used with raw materials in a dry mixing way;
3. the micro-nano SAP holes introduced by the invention are closed holes which are uniformly distributed, so that the frost resistance of the concrete is better;
4. the invention has the advantages of convenient adjustment of aperture and realization of accurate design of the frost resistance of concrete.
Detailed Description
The freezing resistance of the concrete containing the micro-nano SAP holes is tested by adopting a quick freezing method in the experimental process, the freezing resistance test is carried out according to the standard of a common concrete long-term performance and durability test method (GB/T50082-2009), the dynamic elastic modulus and the weight loss rate of the concrete are respectively measured after 50 times, 100 times, 150 times, 200 times and 250 times of freezing and thawing cycles, and the freezing resistance of a concrete test piece is evaluated. Wherein the cellulose ether is hydroxypropyl methyl cellulose ether, the molding curing process of comparative examples 1-4 is the same as that of example 1.
Example 1
The antifreeze concrete containing micro-nano SAP holes comprises the following components in proportion: P.O42.5 Cement 250kg/m 3 100kg/m fly ash 3 60kg/m of mineral powder 3 The sand ratio is 44%, the water-gel ratio is 0.35, the polycarboxylate water reducer is 4.0% of the mass of the cementing material, the cellulose ether is 0.08% of the mass of the cementing material, and the micro-nano SAP particles are 0.8% of the mass of the cementing material, wherein the preparation steps of the micro-nano SAP particles are as follows: 1) Adding SAP particles into a ball mill adopting a first steel forging grinding bin and a second steel ball grinding bin to perform primary grinding for 45 min to obtain primary grinding fine materials, wherein the proportion of the steel forging is as follows: phi 25 multiplied by 30mm steel forging 40%, phi 15 multiplied by 20mm steel forging 60%; the proportion of the steel balls is 15% of the steel balls with the thickness of 20mm, 45% of the steel balls with the thickness of 15mm and 40% of the steel balls with the thickness of 5mm, 2) the primary grinding fine materials, sodium metasilicate pentahydrate and sodium lignin sulfonate are added into a mill with the thickness of 2mm zirconia balls for fine grinding for 60 min, so that micro-nano SAP particles are obtained, and the mass ratio of the primary grinding fine materials, the sodium metasilicate pentahydrate and the sodium lignin sulfonate is 100:1:4.
Through detection, the residual relative dynamic elastic modulus percentages of the test pieces after 50, 100, 150, 200 and 250 freeze thawing cycles are respectively 98%, 96%, 93%, 87% and 85%, and the mass loss percentages are respectively 0.2%, 0.4%, 0.7%, 0.9% and 1.3%.
Comparative example 1
Concrete, mixThe mixing ratio is as follows: P.O42.5 Cement 250kg/m 3 100kg/m fly ash 3 60kg/m of mineral powder 3 The sand ratio is 44%, the water-gel ratio is 0.35, the polycarboxylate water reducer accounts for 4.0% of the mass of the cementing material, and the cellulose ether accounts for 0.08% of the mass of the cementing material.
Through detection, the residual relative dynamic elastic modulus percentages of the test pieces after 50, 100, 150, 200 and 250 freeze thawing cycles are respectively 77%, 74%, 69%, 65% and 61%, and the mass loss percentages are respectively 2.4%, 3.7%, 4.9%, 5.8% and 6.6%.
Comparative example 2
The concrete comprises the following components in proportion: P.O42.5 Cement 250kg/m 3 100kg/m fly ash 3 60kg/m of mineral powder 3 The sand ratio is 44%, the water-gel ratio is 0.35, the polycarboxylate water reducer accounts for 4.0% of the mass of the cementing material, the cellulose ether accounts for 0.08% of the mass of the cementing material, and the untreated SAP particles account for 0.8% of the mass of the cementing material.
Through detection, the residual relative dynamic elastic modulus percentages of the test pieces after 50, 100, 150, 200 and 250 freeze thawing cycles are respectively 85%, 82%, 78%, 72% and 66%, and the mass loss percentages are respectively 1.2%, 1.8%, 2.3%, 3.5% and 4.0%.
Comparative example 3
The concrete comprises the following components in proportion: P.O42.5 Cement 250kg/m 3 100kg/m fly ash 3 60kg/m of mineral powder 3 The sand ratio is 44%, the water-gel ratio is 0.35, the polycarboxylate water reducer is 4.0% of the mass of the cementing material, the cellulose ether is 0.08% of the mass of the cementing material, the pretreated SAP particles are 0.8% of the mass of the cementing material, and the preparation steps of the pretreated SAP particles are as follows: adding SAP particles, sodium metasilicate pentahydrate and sodium lignin sulfonate into a ball mill adopting a first steel forging grinding bin and a second steel ball grinding bin to perform primary grinding 105 min, wherein the ratio of the steel forging is as follows: phi 25 multiplied by 30mm steel forging 40%, phi 15 multiplied by 20mm steel forging 60%; the proportion of the steel balls is 15 percent of the steel balls with the diameter of 20mm, 45 percent of the steel balls with the diameter of 15mm, 40 percent of the steel balls with the diameter of 5mm, and the mass ratio of SAP particles to sodium metasilicate pentahydrate to sodium lignin sulfonate is 100:1:4.
Through detection, the residual relative dynamic elastic modulus percentages of the test pieces after 50, 100, 150, 200 and 250 freeze thawing cycles are respectively 87%, 85%, 81%, 76% and 69%, and the mass loss percentages are respectively 0.9%, 1.2%, 1.5%, 2.1% and 3.3%.
Comparative example 4
The concrete comprises the following components in proportion: P.O42.5 Cement 250kg/m 3 100kg/m fly ash 3 60kg/m of mineral powder 3 The sand ratio is 44%, the water-gel ratio is 0.35, the polycarboxylate water reducer is 4.0% of the mass of the cementing material, the cellulose ether is 0.08% of the mass of the cementing material, and the modified SAP particles are 0.8% of the mass of the cementing material, wherein the preparation steps of the modified SAP particles are as follows: 1) Adding SAP particles into a steel forging ball mill for primary grinding for 45 min to obtain a primary grinding material, wherein the ratio of steel forging is as follows: phi 25 multiplied by 30mm steel forging 40%, phi 15 multiplied by 20mm steel forging 60%; 2) The primary mill was added to a mill using 2mm zirconia balls for fine grinding for 60 mm in.
Through detection, the residual relative dynamic elastic modulus percentages of the test pieces after 50, 100, 150, 200 and 250 freeze thawing cycles are respectively 84%, 82%, 79%, 75% and 66%, and the mass loss percentages are respectively 1.1%, 1.5%, 1.7%, 2.0% and 3.8%.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limited thereto; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features can be replaced with equivalents; such modifications and substitutions do not depart from the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The antifreeze concrete containing micro-nano SAP holes is characterized by comprising the following raw materials in parts by weight:
200-600kg/m of cement 3 50-200kg/m of admixture 3 The sand ratio is 38-46%, the water-gel ratio is 0.3-0.45, the polycarboxylate water reducer is 3-5% of the mass of the cementing material, the cellulose ether is 0.03-0.2% of the mass of the cementing material, and the micro-nano SAP particles are the mass of the cementing material0.3-1％，
The preparation steps of the micro-nano SAP particles are as follows:
1) Adding SAP particles into a ball mill adopting a first steel forging grinding bin and a second steel ball grinding bin for primary grinding to obtain primary grinding fine materials,
2) Adding the primary grinding fine materials, sodium metasilicate pentahydrate and sodium lignin sulfonate into a mill adopting zirconia balls for fine grinding, and obtaining the micro-nano SAP particles.
2. The antifreeze concrete according to claim 1, wherein the steel forging in the step 1) comprises the following components: phi 25 multiplied by 30mm steel forging 30-50%, phi 15 multiplied by 20mm steel forging 50-70%; the proportion of the steel balls is 15-20% of 20mm steel balls, 40-50% of 15mm steel balls and 20-40% of 5mm steel balls.
3. Antifreeze concrete according to claim 1, wherein the initial grinding time in step 1) is 30-50min.
4. The antifreeze concrete according to claim 1, wherein in the step 2), the mass ratio of the primary grinding fine materials, the sodium metasilicate pentahydrate and the sodium lignin sulfonate is 100:0.5-1.5:2-5, the diameter of the zirconia balls is 2mm, and the fine grinding time is 50-70min.
5. Antifreeze concrete according to claim 1, wherein the SAP particles are acrylic cross-linked acrylamide SAP with a particle size of 200-1000 μm and the micro-nano SAP particles have a particle size of 0.3-5 μm.
6. Antifreeze concrete according to claim 1, wherein the cement is at least one of Portland cement, sulphoaluminate cement, and ferroaluminate cement.
7. The antifreeze concrete of claim 1, wherein said admixture is at least one of fly ash, mineral powder, steel slag micropowder, silica fume, fly ash microbeads.
8. The antifreeze concrete of claim 1, wherein the sand is river sand with a mud content of not more than 2%, and the cobble is crushed stone with a grain size of 5-16mm.
9. Antifreeze concrete according to claim 1, wherein the cellulose ether is at least one of hydroxypropyl methyl cellulose ether and hydroxyethyl methyl cellulose ether.
10. Method for the preparation of antifreeze concrete according to any one of claims 1 to 9, comprising the steps of:
a. dissolving a water reducing agent and cellulose ether in water to prepare an additive aqueous solution,
b. adding micro-nano SAP particles, cement and admixture into a concrete mixer, uniformly mixing, adding sand and stones for dry mixing,
c. adding the admixture aqueous solution into the concrete mixer, and continuing mixing, forming and curing to obtain the antifreeze concrete containing the micro-nano SAP holes.
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