CN111875285A - Concrete mortar anti-cracking additive and preparation method thereof - Google Patents
Concrete mortar anti-cracking additive and preparation method thereof Download PDFInfo
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- CN111875285A CN111875285A CN202010833810.0A CN202010833810A CN111875285A CN 111875285 A CN111875285 A CN 111875285A CN 202010833810 A CN202010833810 A CN 202010833810A CN 111875285 A CN111875285 A CN 111875285A
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 46
- 239000000654 additive Substances 0.000 title claims abstract description 38
- 230000000996 additive effect Effects 0.000 title claims abstract description 31
- 238000005336 cracking Methods 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 65
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 64
- 229910052903 pyrophyllite Inorganic materials 0.000 claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000004094 surface-active agent Substances 0.000 claims abstract description 23
- 150000002148 esters Chemical class 0.000 claims abstract description 19
- 239000008367 deionised water Substances 0.000 claims abstract description 18
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 18
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229920000609 methyl cellulose Polymers 0.000 claims abstract description 18
- 239000001923 methylcellulose Substances 0.000 claims abstract description 18
- 235000010981 methylcellulose Nutrition 0.000 claims abstract description 18
- RYYKJJJTJZKILX-UHFFFAOYSA-M sodium octadecanoate Chemical compound [Na+].CCCCCCCCCCCCCCCCCC([O-])=O RYYKJJJTJZKILX-UHFFFAOYSA-M 0.000 claims abstract description 18
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 17
- 239000002253 acid Substances 0.000 claims abstract description 15
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 20
- 239000007822 coupling agent Substances 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 19
- 239000002994 raw material Substances 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 16
- 238000000498 ball milling Methods 0.000 claims description 15
- 239000011259 mixed solution Substances 0.000 claims description 15
- 239000002893 slag Substances 0.000 claims description 15
- LNAZSHAWQACDHT-XIYTZBAFSA-N (2r,3r,4s,5r,6s)-4,5-dimethoxy-2-(methoxymethyl)-3-[(2s,3r,4s,5r,6r)-3,4,5-trimethoxy-6-(methoxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6r)-4,5,6-trimethoxy-2-(methoxymethyl)oxan-3-yl]oxyoxane Chemical compound CO[C@@H]1[C@@H](OC)[C@H](OC)[C@@H](COC)O[C@H]1O[C@H]1[C@H](OC)[C@@H](OC)[C@H](O[C@H]2[C@@H]([C@@H](OC)[C@H](OC)O[C@@H]2COC)OC)O[C@@H]1COC LNAZSHAWQACDHT-XIYTZBAFSA-N 0.000 claims description 10
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 10
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 10
- 239000001110 calcium chloride Substances 0.000 claims description 10
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 229920005646 polycarboxylate Polymers 0.000 claims description 7
- 239000008030 superplasticizer Substances 0.000 claims description 7
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 235000019738 Limestone Nutrition 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 229910021536 Zeolite Inorganic materials 0.000 claims description 5
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 5
- 230000001804 emulsifying effect Effects 0.000 claims description 5
- 239000010881 fly ash Substances 0.000 claims description 5
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 claims description 5
- 239000006028 limestone Substances 0.000 claims description 5
- 239000011863 silicon-based powder Substances 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- 239000010457 zeolite Substances 0.000 claims description 5
- WBIQQQGBSDOWNP-UHFFFAOYSA-N 2-dodecylbenzenesulfonic acid Chemical compound CCCCCCCCCCCCC1=CC=CC=C1S(O)(=O)=O WBIQQQGBSDOWNP-UHFFFAOYSA-N 0.000 claims description 3
- 229920001732 Lignosulfonate Polymers 0.000 claims description 3
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 3
- 229920005551 calcium lignosulfonate Polymers 0.000 claims description 3
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 3
- VVSMKOFFCAJOSC-UHFFFAOYSA-L disodium;dodecylbenzene;sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O.CCCCCCCCCCCCC1=CC=CC=C1 VVSMKOFFCAJOSC-UHFFFAOYSA-L 0.000 claims description 3
- 229940060296 dodecylbenzenesulfonic acid Drugs 0.000 claims description 3
- 239000000194 fatty acid Substances 0.000 claims description 3
- 229930195729 fatty acid Natural products 0.000 claims description 3
- ITCAUAYQCALGGV-XTICBAGASA-M sodium;(1r,4ar,4br,10ar)-1,4a-dimethyl-7-propan-2-yl-2,3,4,4b,5,6,10,10a-octahydrophenanthrene-1-carboxylate Chemical compound [Na+].C([C@@H]12)CC(C(C)C)=CC1=CC[C@@H]1[C@]2(C)CCC[C@@]1(C)C([O-])=O ITCAUAYQCALGGV-XTICBAGASA-M 0.000 claims description 3
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 3
- 150000004665 fatty acids Chemical class 0.000 claims description 2
- 230000000740 bleeding effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 230000008014 freezing Effects 0.000 abstract description 3
- 238000007710 freezing Methods 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 125000005313 fatty acid group Chemical group 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 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
- 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
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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)
- General Chemical & Material Sciences (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a concrete mortar anti-cracking additive and a preparation method thereof, relating to the technical field of additives, wherein the additive comprises the following components in parts by weight: 40-50 parts of ester type polycarboxylic acid water reducing agent, 15-25 parts of modified pyrophyllite powder, 10-20 parts of admixture, 8-12 parts of sodium stearate, 5-9 parts of diethanolamine, 1-3 parts of methyl cellulose, 0.3-0.5 part of surfactant, 0.1-0.5 part of expanding agent, 0.1-0.3 part of antifreezing agent, 0.1-0.3 part of air entraining agent and 25-45 parts of deionized water. The invention can effectively improve the toughness and strength of the concrete mortar, and simultaneously has the effects of freezing resistance, shrinkage compensation and bleeding rate reduction; the product of the invention integrates water resistance, impermeability, crack resistance and pressure resistance, can solve the problems of easy cracking and shrinkage of concrete mortar, and improves the durability of concrete.
Description
Technical Field
The invention relates to the technical field of additives, in particular to a concrete mortar anti-cracking additive and a preparation method thereof.
Background
The concrete admixture is a chemical substance which is added in the process of stirring the concrete, accounts for less than 5 percent of the mass of the cement and can obviously improve the performance of the concrete. The concrete admixture has the characteristics of multiple varieties, small mixing amount, great influence on the performance of concrete, low investment, quick response and obvious technical and economic benefits.
The concrete mortar admixture is mainly a naphthalene-based high-efficiency water reducing agent, a polycarboxylic acid high-performance water reducing agent and an aliphatic high-efficiency water reducing agent.
However, the concrete mortar anti-cracking admixture in the current market has single function, the concrete mortar is easy to crack, shrink and the like in the using process, the crack resistance and the compressive strength are poor, the durability is not ideal, the existing admixture is more in preparation raw materials, more complex in preparation method, higher in production cost and longer in production period, and the requirements of the current market cannot be met. Accordingly, one skilled in the art has provided a concrete mortar anti-crack admixture and a method for preparing the same to solve the problems set forth in the background art.
Disclosure of Invention
The invention aims to provide a concrete mortar anti-cracking additive and a preparation method thereof, and the additive can effectively improve the toughness and strength of the concrete mortar, ensure the compactness of the concrete mortar and improve the anti-cracking and anti-compression performance of the concrete mortar through the synergistic effect and reasonable proportioning of different raw materials.
In order to achieve the purpose, the invention provides the following technical scheme: the concrete mortar anti-cracking additive comprises the following components in parts by weight: 40-50 parts of ester type polycarboxylic acid water reducing agent, 15-25 parts of modified pyrophyllite powder, 10-20 parts of admixture, 8-12 parts of sodium stearate, 5-9 parts of diethanolamine, 1-3 parts of methyl cellulose, 0.3-0.5 part of surfactant, 0.1-0.5 part of expanding agent, 0.1-0.3 part of antifreezing agent, 0.1-0.3 part of air entraining agent and 25-45 parts of deionized water.
As a further scheme of the invention: the additive comprises the following components in parts by weight: 45 parts of ester type polycarboxylic acid water reducing agent, 20 parts of modified pyrophyllite powder, 15 parts of admixture, 10 parts of sodium stearate, 7 parts of diethanolamine, 2 parts of methyl cellulose, 0.4 part of surfactant, 0.3 part of expanding agent, 0.2 part of antifreezing agent, 0.2 part of air entraining agent and 35 parts of deionized water.
As a still further scheme of the invention: the modified pyrophyllite powder is prepared by the following method:
s11: mixing pyrophyllite powder and absolute ethyl alcohol according to the proportion of 1: 5-8, and performing ball milling and mixing for 0.5-1 h to obtain a mixture;
s12, adding calcium chloride and aluminum chloride into the mixture, and performing ball milling and mixing for 0.2-0.5 h;
and S13, sequentially adding a titanate coupling agent and a polymethylsilane coupling agent, and performing ball milling and mixing for 0.5-1 h to obtain the modified pyrophyllite powder.
As a still further scheme of the invention: in the step S12, the addition amount of calcium chloride and aluminum chloride is 3-7% of the weight of the pyrophyllite powder.
As a still further scheme of the invention: in the step S13, the addition amount of the titanate coupling agent and the polymethylsilane coupling agent is 1-3% of the weight of the pyrophyllite powder.
As a still further scheme of the invention: the admixture is a mixture of fly ash, slag, superfine silicon powder, zeolite powder, steel slag powder, phosphorous slag powder and limestone powder.
As a still further scheme of the invention: the surfactant is any one or a mixture of more of calcium lignosulphonate, sodium abietate, rosin, dodecylbenzene sulfonic acid and sodium dodecylbenzene sulfate.
As a still further scheme of the invention: the air entraining agent is any one of lignosulfonate, fatty acid or resin acid.
A preparation method of a concrete mortar anti-cracking additive comprises the following steps:
preparing S21 raw material: weighing the required raw materials of ester type polycarboxylate superplasticizer, modified pyrophyllite powder, admixture, sodium stearate, diethanolamine, methyl cellulose, surfactant, expanding agent, antifreezing agent, air entraining agent and deionized water according to the weight part ratio for later use;
preparing an S22 mixed solution: adding an ester type polycarboxylic acid water reducing agent into deionized water, uniformly stirring, sequentially adding modified pyrophyllite powder, an admixture, sodium stearate, diethanolamine and methylcellulose, stirring while adding, uniformly mixing, and emulsifying and homogenizing to obtain a mixed solution;
s23 addition of additives: and sequentially adding an air entraining agent, a surfactant, an expanding agent and an antifreezing agent into the mixed solution, uniformly stirring, and reacting for 1-3 hours to obtain the waterproof agent product.
Compared with the prior art, the invention has the beneficial effects that: the invention discloses a concrete mortar anti-cracking additive and a preparation method thereof, wherein the raw materials are added with ester polycarboxylic acid water reducing agent, modified pyrophyllite powder, admixture and other components, and through the synergistic effect and reasonable proportioning of different raw materials, the toughness and strength of the concrete mortar can be effectively improved, the compactness of the concrete mortar is ensured, the concrete mortar is prevented from leaking and cracking, the anti-cracking and anti-compression performance of the concrete mortar is improved, and meanwhile, the concrete mortar anti-cracking additive has the effects of freezing resistance, shrinkage compensation and bleeding rate reduction.
The product of the invention integrates water resistance, impermeability, crack resistance and pressure resistance, can solve the problems of easy cracking and shrinkage of concrete mortar, and improves the durability of concrete.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the embodiment of the present invention, the first and second substrates,
example 1
The concrete mortar anti-cracking additive comprises the following components in parts by weight: 40 parts of ester type polycarboxylic acid water reducing agent, 15 parts of modified pyrophyllite powder, 10 parts of admixture, 8 parts of sodium stearate, 5 parts of diethanolamine, 1 part of methyl cellulose, 0.3 part of surfactant, 0.1 part of expanding agent, 0.1 part of antifreezing agent, 0.1 part of air entraining agent and 25 parts of deionized water.
Further, the modified pyrophyllite powder is prepared by adopting the following method:
s11: mixing pyrophyllite powder and absolute ethyl alcohol according to the proportion of 1: 5, ball-milling and mixing for 0.5h to obtain a mixture;
s12, adding calcium chloride and aluminum chloride into the mixture, and performing ball milling and mixing for 0.2 h;
and S13, sequentially adding a titanate coupling agent and a polymethylsilane coupling agent, and performing ball milling and mixing for 0.5h to obtain the modified pyrophyllite powder.
Still further, in step S12, the addition amounts of calcium chloride and aluminum chloride are both 3% of the weight of the pyrophyllite powder.
Further, in step S13, the addition amounts of the titanate coupling agent and the polymethylsilane coupling agent are both 1% of the weight of the pyrophyllite powder.
And further, the admixture is a mixture of fly ash, slag, superfine silicon powder, zeolite powder, steel slag powder, phosphorous slag powder and limestone powder.
Still further, the surfactant is a mixture of calcium lignosulphonate and sodium abietate.
Still further, the air entraining agent is lignosulfonate.
A preparation method of a concrete mortar anti-cracking additive comprises the following steps:
preparing S21 raw material: weighing the required raw materials of ester type polycarboxylate superplasticizer, modified pyrophyllite powder, admixture, sodium stearate, diethanolamine, methyl cellulose, surfactant, expanding agent, antifreezing agent, air entraining agent and deionized water according to the weight part ratio for later use;
preparing an S22 mixed solution: adding an ester type polycarboxylic acid water reducing agent into deionized water, uniformly stirring, sequentially adding modified pyrophyllite powder, an admixture, sodium stearate, diethanolamine and methylcellulose, stirring while adding, uniformly mixing, and emulsifying and homogenizing to obtain a mixed solution;
s23 addition of additives: and adding an air entraining agent, a surfactant, an expanding agent and an antifreezing agent into the mixed solution in sequence, uniformly stirring, and reacting for 1h to obtain the waterproof agent product.
Example 2
The concrete mortar anti-cracking additive comprises the following components in parts by weight: 50 parts of ester type polycarboxylic acid water reducing agent, 25 parts of modified pyrophyllite powder, 20 parts of admixture, 12 parts of sodium stearate, 9 parts of diethanolamine, 3 parts of methyl cellulose, 0.5 part of surfactant, 0.5 part of expanding agent, 0.3 part of antifreezing agent, 0.3 part of air entraining agent and 45 parts of deionized water.
Further, the modified pyrophyllite powder is prepared by adopting the following method:
s11: mixing pyrophyllite powder and absolute ethyl alcohol according to the proportion of 1: 8, ball milling and mixing for 1h to obtain a mixture;
s12, adding calcium chloride and aluminum chloride into the mixture, and performing ball milling and mixing for 0.5 h;
and S13, sequentially adding a titanate coupling agent and a polymethylsilane coupling agent, and performing ball milling and mixing for 1h to obtain the modified pyrophyllite powder.
Still further, in step S12, the addition amounts of calcium chloride and aluminum chloride are both 7% of the weight of the pyrophyllite powder.
Further, in step S13, the addition amounts of the titanate coupling agent and the polymethylsilane coupling agent are both 3% of the weight of the pyrophyllite powder.
And further, the admixture is a mixture of fly ash, slag, superfine silicon powder, zeolite powder, steel slag powder, phosphorous slag powder and limestone powder.
Still further, the surfactant is rosin.
Still further, the air entraining agent is a fatty acid.
A preparation method of a concrete mortar anti-cracking additive comprises the following steps:
preparing S21 raw material: weighing the required raw materials of ester type polycarboxylate superplasticizer, modified pyrophyllite powder, admixture, sodium stearate, diethanolamine, methyl cellulose, surfactant, expanding agent, antifreezing agent, air entraining agent and deionized water according to the weight part ratio for later use;
preparing an S22 mixed solution: adding an ester type polycarboxylic acid water reducing agent into deionized water, uniformly stirring, sequentially adding modified pyrophyllite powder, an admixture, sodium stearate, diethanolamine and methylcellulose, stirring while adding, uniformly mixing, and emulsifying and homogenizing to obtain a mixed solution;
s23 addition of additives: and adding an air entraining agent, a surfactant, an expanding agent and an antifreezing agent into the mixed solution in sequence, uniformly stirring, and reacting for 3 hours to obtain the waterproof agent product.
Example 3
The concrete mortar anti-cracking additive comprises the following components in parts by weight: 45 parts of ester type polycarboxylic acid water reducing agent, 20 parts of modified pyrophyllite powder, 15 parts of admixture, 10 parts of sodium stearate, 7 parts of diethanolamine, 2 parts of methyl cellulose, 0.4 part of surfactant, 0.3 part of expanding agent, 0.2 part of antifreezing agent, 0.2 part of air entraining agent and 35 parts of deionized water.
Further, the modified pyrophyllite powder is prepared by adopting the following method:
s11: mixing pyrophyllite powder and absolute ethyl alcohol according to the proportion of 1: 6.5, ball-milling and mixing for 0.75h to obtain a mixture;
s12, adding calcium chloride and aluminum chloride into the mixture, and performing ball milling and mixing for 0.35 h;
and S13, sequentially adding a titanate coupling agent and a polymethylsilane coupling agent, and performing ball milling and mixing for 0.75h to obtain the modified pyrophyllite powder.
Still further, in step S12, the addition amounts of calcium chloride and aluminum chloride are both 5% of the weight of the pyrophyllite powder.
Further, in step S13, the addition amounts of the titanate coupling agent and the polymethylsilane coupling agent are both 2% of the weight of the pyrophyllite powder.
And further, the admixture is a mixture of fly ash, slag, superfine silicon powder, zeolite powder, steel slag powder, phosphorous slag powder and limestone powder.
Still further, the surfactant is a mixture of dodecylbenzene sulfonic acid and sodium dodecylbenzene sulfate.
Still further, the air entraining agent is a resin acid.
A preparation method of a concrete mortar anti-cracking additive comprises the following steps:
preparing S21 raw material: weighing the required raw materials of ester type polycarboxylate superplasticizer, modified pyrophyllite powder, admixture, sodium stearate, diethanolamine, methyl cellulose, surfactant, expanding agent, antifreezing agent, air entraining agent and deionized water according to the weight part ratio for later use;
preparing an S22 mixed solution: adding an ester type polycarboxylic acid water reducing agent into deionized water, uniformly stirring, sequentially adding modified pyrophyllite powder, an admixture, sodium stearate, diethanolamine and methylcellulose, stirring while adding, uniformly mixing, and emulsifying and homogenizing to obtain a mixed solution;
s23 addition of additives: and sequentially adding an air entraining agent, a surfactant, an expanding agent and an antifreezing agent into the mixed solution, uniformly stirring, and reacting for 2 hours to obtain the waterproof agent product.
Comparative example 1
The existing commercial concrete mortar admixture is selected.
Examples of the experiments
The additive products in the embodiment 1, the embodiment 2, the embodiment 3 and the comparative example 1 are respectively selected to carry out the crack resistance and the compressive strength performance detection of the concrete mortar, and the mixing amount is 3 percent.
The experimental results are detailed in table 1 below.
TABLE 1 test results of Experimental Properties
Therefore, compared with the comparative example 1, the additive products of the examples 1, 2 and 3 have long crack resistance time, small crack area and high compressive strength, the invention effectively improves the performance of the concrete mortar and improves the crack resistance and the compressive strength.
In conclusion, the ester-type polycarboxylate superplasticizer, the modified pyrophyllite powder, the admixture and other components are added into the raw materials, and through the synergistic effect and reasonable proportioning of different raw materials, the toughness and the strength of the concrete mortar can be effectively improved, the compactness of the concrete mortar is ensured, the concrete mortar is prevented from leaking and cracking, the anti-cracking and anti-compression properties of the concrete mortar are improved, and meanwhile, the ester-type polycarboxylate superplasticizer has the effects of resisting freezing, compensating shrinkage and reducing bleeding rate; the product of the invention integrates water resistance, impermeability, crack resistance and pressure resistance, can solve the problems of easy cracking and shrinkage of concrete mortar, and improves the durability of concrete.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. The concrete mortar anti-cracking additive is characterized in that: the additive comprises the following components in parts by weight: 40-50 parts of ester type polycarboxylic acid water reducing agent, 15-25 parts of modified pyrophyllite powder, 10-20 parts of admixture, 8-12 parts of sodium stearate, 5-9 parts of diethanolamine, 1-3 parts of methyl cellulose, 0.3-0.5 part of surfactant, 0.1-0.5 part of expanding agent, 0.1-0.3 part of antifreezing agent, 0.1-0.3 part of air entraining agent and 25-45 parts of deionized water.
2. The concrete mortar crack resistance additive according to claim 1, which is characterized in that: the additive comprises the following components in parts by weight: 45 parts of ester type polycarboxylic acid water reducing agent, 20 parts of modified pyrophyllite powder, 15 parts of admixture, 10 parts of sodium stearate, 7 parts of diethanolamine, 2 parts of methyl cellulose, 0.4 part of surfactant, 0.3 part of expanding agent, 0.2 part of antifreezing agent, 0.2 part of air entraining agent and 35 parts of deionized water.
3. The concrete mortar crack resistance additive according to claim 1, which is characterized in that: the modified pyrophyllite powder is prepared by the following method:
s11: mixing pyrophyllite powder and absolute ethyl alcohol according to the proportion of 1: 5-8, and performing ball milling and mixing for 0.5-1 h to obtain a mixture;
s12, adding calcium chloride and aluminum chloride into the mixture, and performing ball milling and mixing for 0.2-0.5 h;
and S13, sequentially adding a titanate coupling agent and a polymethylsilane coupling agent, and performing ball milling and mixing for 0.5-1 h to obtain the modified pyrophyllite powder.
4. The concrete mortar crack resistance additive according to claim 3, which is characterized in that: in the step S12, the addition amount of calcium chloride and aluminum chloride is 3-7% of the weight of the pyrophyllite powder.
5. The concrete mortar crack resistance additive according to claim 3, which is characterized in that: in the step S13, the addition amount of the titanate coupling agent and the polymethylsilane coupling agent is 1-3% of the weight of the pyrophyllite powder.
6. The concrete mortar crack resistance additive according to claim 1, which is characterized in that: the admixture is a mixture of fly ash, slag, superfine silicon powder, zeolite powder, steel slag powder, phosphorous slag powder and limestone powder.
7. The concrete mortar crack resistance additive according to claim 1, which is characterized in that: the surfactant is any one or a mixture of more of calcium lignosulphonate, sodium abietate, rosin, dodecylbenzene sulfonic acid and sodium dodecylbenzene sulfate.
8. The concrete mortar crack resistance additive according to claim 1, which is characterized in that: the air entraining agent is any one of lignosulfonate, fatty acid or resin acid.
9. The method for preparing the concrete mortar anti-cracking admixture according to any one of claims 1 to 8, which is characterized by comprising the following steps: the concrete preparation method of the additive comprises the following steps:
preparing S21 raw material: weighing the required raw materials of ester type polycarboxylate superplasticizer, modified pyrophyllite powder, admixture, sodium stearate, diethanolamine, methyl cellulose, surfactant, expanding agent, antifreezing agent, air entraining agent and deionized water according to the weight part ratio for later use;
preparing an S22 mixed solution: adding an ester type polycarboxylic acid water reducing agent into deionized water, uniformly stirring, sequentially adding modified pyrophyllite powder, an admixture, sodium stearate, diethanolamine and methylcellulose, stirring while adding, uniformly mixing, and emulsifying and homogenizing to obtain a mixed solution;
s23 addition of additives: and sequentially adding an air entraining agent, a surfactant, an expanding agent and an antifreezing agent into the mixed solution, uniformly stirring, and reacting for 1-3 hours to obtain the waterproof agent product.
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| CN112624663A (en) * | 2020-12-21 | 2021-04-09 | 河南涵宇特种建筑材料有限公司 | Production method of novel concrete waterproof additive |
| CN112624711A (en) * | 2021-01-19 | 2021-04-09 | 河南应用技术职业学院 | Anti-freezing concrete for building and preparation method thereof |
| CN113816636A (en) * | 2021-10-15 | 2021-12-21 | 中南钻石有限公司 | Anti-crack admixture for concrete/mortar prepared from pyrophyllite and dolomite |
| CN116063041A (en) * | 2022-12-30 | 2023-05-05 | 东台市凯仑商品混凝土有限公司 | High-tensile-property lightweight aggregate concrete based on modified mortar, and preparation method and application thereof |
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