CN116477864A - Anti-cracking waterproof compacting agent, preparation method and use method - Google Patents
Anti-cracking waterproof compacting agent, preparation method and use method Download PDFInfo
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- CN116477864A CN116477864A CN202310295285.5A CN202310295285A CN116477864A CN 116477864 A CN116477864 A CN 116477864A CN 202310295285 A CN202310295285 A CN 202310295285A CN 116477864 A CN116477864 A CN 116477864A
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- 238000005336 cracking Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000004567 concrete Substances 0.000 claims abstract description 79
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 77
- 229920001184 polypeptide Polymers 0.000 claims abstract description 48
- 102000004196 processed proteins & peptides Human genes 0.000 claims abstract description 48
- 108090000765 processed proteins & peptides Proteins 0.000 claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 125000002811 oleoyl group Chemical group O=C([*])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])/C([H])=C([H])\C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims abstract description 38
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims abstract description 32
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 28
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 28
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 28
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000004568 cement Substances 0.000 claims description 21
- 238000003756 stirring Methods 0.000 claims description 15
- 239000002904 solvent Substances 0.000 claims description 11
- 239000004570 mortar (masonry) Substances 0.000 claims description 8
- 239000000378 calcium silicate Substances 0.000 claims description 5
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 5
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 5
- 239000011734 sodium Substances 0.000 claims description 5
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 3
- 239000004115 Sodium Silicate Substances 0.000 claims description 3
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 claims description 3
- PAZHGORSDKKUPI-UHFFFAOYSA-N lithium metasilicate Chemical compound [Li+].[Li+].[O-][Si]([O-])=O PAZHGORSDKKUPI-UHFFFAOYSA-N 0.000 claims description 3
- 229910052912 lithium silicate Inorganic materials 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 15
- 239000011376 self-consolidating concrete Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 13
- 239000000203 mixture Substances 0.000 description 12
- 239000003513 alkali Substances 0.000 description 10
- 239000011148 porous material Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000010276 construction Methods 0.000 description 6
- 238000011056 performance test Methods 0.000 description 6
- 239000004094 surface-active agent Substances 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 5
- 238000006703 hydration reaction Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000004078 waterproofing Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000002209 hydrophobic effect Effects 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000005871 repellent Substances 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000000536 complexating effect Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920000620 organic polymer Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- -1 hydroxide ions Chemical class 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method 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
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/65—Water proofers or repellants
-
- 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
Abstract
The invention provides an anti-cracking waterproof compacting agent, a preparation method and a use method thereof, wherein the anti-cracking waterproof compacting agent comprises the following components in percentage by weight: 3-8% of sodium dodecyl benzene sulfonate; 3-10% of oleoyl polypeptide complex; silicate 5-15%; 20-40% of calcium hydroxide; 27-69% of water. The anti-cracking waterproof compacting agent effectively solves the later water leakage phenomenon of a building, effectively controls concrete cracking, and realizes the long-acting waterproof effect of self-compacting concrete.
Description
Technical Field
The invention relates to the field of buildings, in particular to an anti-cracking waterproof compacting agent, a preparation method and a use method.
Background
At present, leakage is a second major problem affecting building quality except building structures in China, and is a major problem puzzling the building industry and families, the average leakage rate of a house in the country is basically kept at about 65%, and the leakage rate of an underground building is more than 80%.
The leakage is mainly because concrete is a heterogeneous material with capillary pores and communication channels inside, and the main reasons for formation are that on one hand, the cement hardening process generates volume change and releases hydration heat, chemical shrinkage and self-shrinkage are generated in the initial stage, temperature-decreasing shrinkage is generated in 3-7 days, drying shrinkage is generated after wet curing is stopped after 14 days, and the cement concrete is influenced by thermal expansion and contraction of weather after entering the service period and has quite large temperature shrinkage under quenching; on the other hand, since the water consumption in concrete is larger than the theoretical water consumption for cement hydration, water can leak out from the interior of the concrete, causing voids and channels to appear in the interior of the concrete.
Rigid waterproofing has been in existence since the country of construction, but has been gradually replaced by flexible waterproofing methods since the problems of waterproofing leakage and the like have not been thoroughly solved by the process bottleneck in the early years. In recent years, with the popularization of new technology and new material application, the rigid waterproof technology is greatly improved, and meanwhile, the problem of water leakage cannot be thoroughly solved in underground waterproof engineering due to flexible waterproof, so that the rigid waterproof technology is gradually accepted by the market due to low cost, short construction period and good effect.
The rigid-flexible combined waterproof technology applied at present is to apply a flexible waterproof layer outside the structure so as to make up the waterproof defect of the structural concrete. However, in construction, quality problems such as honeycomb dog holes, cold joints and the like generated by rigid concrete are often ignored, and the flexible waterproof layer outside the structure is easy to generate the problems such as water channeling and the like, so that the later water leakage phenomenon of the building occurs.
Disclosure of Invention
In order to solve the problems, the invention provides an anti-cracking waterproof compacting agent, a preparation method and a use method thereof, which effectively solve the problem of water leakage at the later stage of a building, effectively control concrete cracking and realize the long-term waterproof effect of self-compacting concrete.
The invention provides an anti-cracking waterproof compacting agent, which comprises the following components in percentage by weight: 3-8% of sodium dodecyl benzene sulfonate; 3-10% of oleoyl polypeptide complex; silicate 5-15%; 20-40% of calcium hydroxide; 27-69% of water.
Further, the waterproof compacting agent comprises the following components in percentage by weight: 3-6% of sodium dodecyl benzene sulfonate; 5.5-7.5% of oleoyl polypeptide complex; 8-11% of silicate; 28-36% of calcium hydroxide; 40-50% of water.
Further, the waterproof compacting agent comprises the following components in percentage by weight: 5-6% of sodium dodecyl benzene sulfonate; 6-7% of oleoyl polypeptide complex; 9-10% of silicate; 30-32% of calcium hydroxide; 45-50% of water.
Further, the weight ratio of sodium dodecylbenzenesulfonate to oleoyl polypeptide complex=1, (1-3).
Further, the weight ratio of sodium dodecyl benzene sulfonate to oleoyl polypeptide complex=1, (1-2.5).
Further, the oleoyl polypeptide complex is one or a combination of more than one of N-oleoyl polypeptide, N-oleoyl polypeptide sodium poly-condensed amino acid and N-alkanoyl polypeptide.
Further, the silicate is one or a combination of sodium silicate, lithium silicate, aluminum silicate and calcium silicate.
In a second aspect of the present invention, a method for preparing an anti-cracking waterproof compacting agent is provided, comprising the steps of:
adding sodium dodecyl benzene sulfonate into water, stirring and dissolving to form a dissolving solution;
adding the oleoyl polypeptide complex into the solution, and uniformly stirring to form a primary solvent;
adding a first part of calcium hydroxide into a primary solvent, and stirring to form an intermediate solvent;
and adding the second part of calcium hydroxide, uniformly stirring, adding silicate, and stirring to form the waterproof compacting agent.
Further, the mass ratio of the first part of calcium hydroxide to the second part of calcium hydroxide is 3:2.
In a third aspect of the invention, a method for using the anti-cracking waterproof compacting agent is provided, wherein the waterproof compacting agent is added and used according to 0.16-0.24wt% of the total amount of mortar cement in concrete.
The invention adopts silicate, sodium dodecyl benzene sulfonate and oleoyl polypeptide complex to interact under the environment of calcium hydroxide, and introduces-COO - 、-COONa、-SO 3 High-efficiency chelating Ca in cement with Na and other structures 2+ 、Al 3+ The plasma is used for further forming a stable compact waterproof layer, so that the problems of poor compatibility and easy layering fracture between the organic polymer and the inorganic cement are solved; meanwhile, the waterproof compacting agent is endowed with hydrophobic property, and the integral modified cement-based waterproof concrete has the advantages of good impermeability, low water absorption and water and dirt resistanceAnd the strength and mechanical property of the concrete are further improved.
It should be understood that the description in this summary is not intended to limit the critical or essential features of the embodiments of the invention, nor is it intended to limit the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
The above and other features, advantages and aspects of embodiments of the present invention will become more apparent by reference to the following detailed description when taken in conjunction with the accompanying drawings. In the drawings, wherein like or similar reference numerals denote like or similar elements, in which:
FIG. 1 is a diagram showing the preparation process of this example.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In addition, the term "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
In a first aspect of the present invention, there is provided an anti-cracking waterproof compacting agent, the waterproof compacting agent comprising the following components in weight percent: 3-8% of sodium dodecyl benzene sulfonate; 3-10% of oleoyl polypeptide complex; silicate 5-15%; 20-40% of calcium hydroxide; 27-69% of water.
In other embodiments, the waterproof compacting agent preferably comprises the following components in weight percent: 3-6% of sodium dodecyl benzene sulfonate; 5.5-7.5% of oleoyl polypeptide complex; 8-11% of silicate; 28-36% of calcium hydroxide; 40-50% of water.
In other embodiments, the waterproof compacting agent preferably comprises the following components in weight percent: 5-6% of sodium dodecyl benzene sulfonate; 6-7% of oleoyl polypeptide complex; 9-10% of silicate; 30-32% of calcium hydroxide; 45-50% of water.
In this embodiment, the weight ratio of sodium dodecylbenzenesulfonate to oleoyl polypeptide complex=1, (1-3).
In other embodiments, it is preferred that the weight ratio of sodium dodecyl benzene sulfonate to oleoyl polypeptide complex = 1 (1-2.5).
In other embodiments, it is preferred that the oleoyl polypeptide complex comprises a combination of one or more selected from the group consisting of N-oleoyl polypeptides, sodium N-oleoyl polypeptides, and N-alkanoyl polypeptides. Specifically, the general chemical structural formula of oleoyl polypeptide complex is as follows:
in other embodiments, the silicate comprises a combination of one or more selected from sodium silicate, lithium silicate, aluminum silicate, calcium silicate.
The waterproof compacting agent composed of the components is a stable suspension solution, is an organic water repellent, is a low-alkali high-performance green novel concrete additive, is properly mixed into concrete, generates hydrophobic gel and crystals after being mixed with water, fills capillary holes in the concrete and blocks water seepage channels; meanwhile, the compactness of the concrete structure is improved, the cracking resistance of the concrete is enhanced, the cracking of the concrete is effectively prevented or reduced, the strength and seepage-proofing capability of the concrete are improved, and the waterproof performance of the concrete is improved.
In a second aspect of the present invention, as shown in fig. 1, there is provided a method for preparing an anti-cracking waterproof compacting agent, comprising the steps of:
s1: adding sodium dodecyl benzene sulfonate into water, stirring and dissolving to form a dissolving solution;
s2: adding the oleoyl polypeptide complex into the solution, and uniformly stirring to form a primary solvent;
s3: adding a first part of calcium hydroxide into a primary solvent, and stirring to form an intermediate solvent;
s4: and adding the second part of calcium hydroxide, uniformly stirring, adding silicate, and stirring to form the waterproof compacting agent.
In this embodiment, the mass ratio of the first part of calcium hydroxide to the second part of calcium hydroxide is 3:2. The sodium hydroxide is added in batches to control the alkalinity of the solution, prevent the alkalinity from being too great, destroy the later activity of the oleoyl polypeptide complex, prevent the excessive reaction and weaken the overall waterproof effect of the waterproof compacting agent.
Specifically, calcium hydroxide is added in batches to help the stability of the inside of the waterproof compacting agent, sodium dodecyl benzene sulfonate powder is dissolved by water, a viscous oleoyl polypeptide complex is diluted to form a stable primary solvent with sodium dodecyl benzene sulfonate, at the moment, more than half of calcium hydroxide is added to enable the solvent to be in a strong alkali environment, the oleoyl polypeptide complex is complexed with sodium dodecyl benzene sulfonate to form a complex, the other part of calcium hydroxide is added to continuously keep the strong alkali environment, silicate is added at the moment, and the complex reacts with hydroxyl to generate a certain amount of calcium silicate particles, so that the calcium silicate is uniformly distributed in the complex environment to form the stable waterproof compacting agent. The silicate reacts with hydroxyl to neutralize alkali, so that the whole system is weakly alkaline, and after the silicate is applied to concrete, the silicate has better compatibility with the alkaline environment of the concrete, does not immediately perform chemical reaction, and after the waterproof compacting agent enters the interior of the concrete, the silicate reacts with the reaction products in the concrete such as cement products, so that the effects of seepage prevention and densification in the interior are truly achieved.
Wherein the chemical structural formula of the complex is as follows:
in a third aspect of the invention, a method for using the anti-cracking waterproof compacting agent is provided, wherein the anti-cracking waterproof compacting agent is added and used according to 0.16-0.24wt% of the total amount of mortar cement in concrete. Because the waterproof compacting agent is a suspension, a certain amount of sediment can be formed after the waterproof compacting agent is placed for a certain period of time, and the waterproof compacting agent is added into concrete after being uniformly shaken when being used.
In the use of the waterproof compacting agent, the addition amount of the waterproof compacting agent is determined according to the total amount of mortar cement in concrete, the mortar cement in concrete refers to cementing materials in concrete, and the cementing materials can bond particles or block materials into an integral material in the process of changing plastic slurry into hard stone by the physical and chemical actions of the cementing materials, and the materials are generally cement, water, slag powder, fly ash, silica fume and the like which have activity and participate in cement hydration.
The invention adopts simple components to prepare the anti-cracking waterproof compacting agent to solve the waterproof problem of concrete construction, and the concrete principle is as follows:
when the concrete construction is carried out, pores such as honeycomb dog holes, cold seams and the like are generated in the hydration reaction process in the concrete, silicate reaches the pores along with water and reacts with hydration products of cement to generate gel containing silicate groups, the gel is used as aggregate components to fill and block the pores in the concrete in the growth process, so that the communication of capillary channels is cut off, the porosity in the concrete is reduced, the compactness and the impermeability are improved, and as long as the silicate is not consumed, the gel is continuously generated, the pores are continuously blocked, the impermeability of the concrete is greatly improved, and the impermeability effect is better and the penetration depth of the concrete is increased under the condition that water exists along with the increase of time; meanwhile, the existence of the gel reduces the volume shrinkage and cracking of the concrete in the drying process.
However, when silicate is used to enhance the strength of concrete, hydroxide ions are generated inside, which penetrate along with water to the surface of the matrix and diffuse into the air in water, and tiny alkali particles are formed after the water on the surface of the matrix evaporates, and the alkali particles are white and appear as alkali return, so that the alkali-aggregate reaction of the cement-based material is destroyed. Aiming at the phenomenon, the invention adopts the combination of the oleoyl polypeptide complex and sodium dodecyl benzene sulfonate to solve the alkali return phenomenon, and particularly, the oleoyl polypeptide complex is complexed with sodium dodecyl benzene sulfonate to form a complex under the alkaline condition, and the alkali is neutralized inside to maintain the internal environment of the concrete for a long time so as to prevent the alkali return; the oleoyl polypeptide compound is used as an auxiliary surfactant, which is favorable for the extension of surfactant molecules, obviously reduces the interaction between the surfactant molecules and improves the action effect of the surfactant; the oleoyl polypeptide compound also has the characteristics of foamability, dispersion suspension property, adsorptivity and the like as an auxiliary surfactant, is used for improving the uniformity of the waterproof compacting agent, preventing the waterproof compacting agent from precipitating, is favorable for the stability of the performance of the waterproof compacting agent, and is convenient to directly use. Preferably, the oleoyl polypeptide complex is added at a temperature of 20-30℃ with optimal results. This is due to: the temperature is too high, bubbles generated by the reaction of the oleoyl polypeptide compound are too fast and too much, the filling compactness of the aggregate material in the pores is affected, the temperature is too low, the bubbles are generated too slowly or too little, and the effect of blocking capillary action is poor.
On one hand, in the process of complexing sodium dodecyl benzene sulfonate with an oleoyl polypeptide compound to form the compound, a large amount of micro foam can be generated, a capillary passage generated in the hardening process of concrete is cut off, the capillary action is reduced, and the impermeability is improved; on one hand, the composite material is used as a surfactant, can destroy electrostatic attraction generated in a concrete system, improves the dispersibility of aggregate components, enables the aggregate components to be more uniformly distributed in the concrete, and increases the compactness of the interior of the concrete; meanwhile, the sodium dodecyl benzene sulfonate has strong penetrability in water and can be matched with Ca in cement paste 2+ Complexing to form a complex when the complex is covered by SiO 3 2- Iso-substitution, creating crystals or precipitates to plug the pores, thereby increasing the barrier properties of the present invention; and the sodium dodecyl benzene sulfonate is not consumed, so that the long-acting waterproof performance of the invention is greatly improved.
The invention adopts silicate, sodium dodecyl benzene sulfonate and oleoyl polypeptide complex to interact under the environment of calcium hydroxide, and introduces-COO - 、-COONa、-SO 3 High-efficiency chelating Ca in cement with Na and other structures 2+ 、Al 3+ The plasma is used for further forming a stable compact waterproof layer, so that the problems of poor compatibility and easy layering fracture between the organic polymer and the inorganic cement are solved; meanwhile, the waterproof compacting agent is endowed with hydrophobic property, and the integral modified cement-based waterproof concrete has the characteristics of good impermeability, low water absorption rate, water resistance and stain resistance, and further improves the strength and mechanical property of the concrete.
Specific performance test:
performance tests were performed according to the Standard Hydraulic concrete test procedure DL/T5150-2001 and the Standard mortar, concrete waterproofing agent JC 474-1999.
The waterproof compacting agent is prepared by adopting the formula and the preparation method of the waterproof compacting agent, and the specific composition is shown in Table 1. And the waterproof compacting agent is added into the original proportion concrete, wherein the composition and performance data of the original proportion concrete are shown in Table 2.
TABLE 1 composition of waterproof compactors
| Component W% | Sodium dodecyl benzene sulfonate | Oleoyl polypeptide complexes | Silicate salt | Calcium hydroxide | Water and its preparation method |
| Code | A | B | C | D | E |
TABLE 2 test data and Performance test data for raw mix concrete
In the original proportion concrete, the concrete with waterproof and seepage-proofing effects is prepared by adding a waterproof compacting agent according to the amount of 0.2w% of the sand cement, slump is measured, the concrete without the waterproof compacting agent is respectively subjected to standard curing for 3 days, then is subjected to dry curing, the strength, flexural strength and compressive strength on the 28 th day are measured, the shrinkage, water-permeable pressure ratio and water absorption ratio on the 60 th day (48 h) are measured, and specific performance test data are shown in tables 3 and 4.
Table 3 composition test data and waterproof data of waterproof compactors of examples
Table 4 composition test data and waterproof data of the waterproof compactors of the respective comparative examples
The waterproof performance test of the waterproof compactors and the concrete with various proportions can clearly obtain:
the waterproof compacting agent and the concrete without the waterproof compacting agent are greatly different in performance, the waterproof performance and the mechanical performance of the concrete body can be improved by adopting the waterproof compacting agent, and the best proportion is selected from the concrete with the waterproof compacting agent as the example 6 and the concrete with the waterproof compacting agent as the example 9 according to the overall performance, and the best comprehensive performance of the concrete with the waterproof compacting agent is shown from the two groups of data.
As can be seen from comparative examples 1 and 2 in Table 4, even though the components were within the values, the sodium dodecylbenzenesulfonate and oleoyl polypeptide complex was used in an amount exceeding the prescribed 1: in the range of (1-3), the performance is significantly lowered, and it is found that the sodium dodecylbenzenesulfonate or oleoyl polypeptide complex, if present in excess, does not exert a water-repellent effect during the reaction, and that the composition as an active agent damages the internal structure of the concrete to make it impossible to exert a water-repellent effect.
As can be seen from comparative examples 3 to 8, the compositions are outside the value range, the comprehensive waterproof performance of the composition also cannot meet the requirements, and the composition has a great gap from the waterproof compacting agent in the value range of the formula to be protected.
Concrete incorporating the waterproof compacting agent of the present invention has significantly increased slump, and the slump is gradually increased according to the amount of the admixture. The concrete flowability of the waterproof compacting agent is improved continuously, and the waterproof compacting agent is beneficial to solving the quality defects of root rot and honeycomb dog hole caused by poor concrete flowability;
the concrete doped with the waterproof compacting agent can effectively control the shrinkage of mortar concrete, has smaller total shrinkage and obvious cracking resistance effect;
the strength of the concrete doped with the waterproof compacting agent is increased by more than 15 percent with the strength of the concrete not doped with the waterproof compacting agent, and the product has a remarkable improvement on the strength of the concrete;
the mortar of the concrete doped with the waterproof compacting agent has high water permeability and small water absorption, and can better achieve the waterproof and seepage-proof effects.
In order to determine the optimal adding amount of the waterproof compacting agent, a performance test experiment is designed, the formula composition of the waterproof compacting agent in the optimal embodiment 6 is selected, and 0.1%, 0.16%, 0.2%, 0.24% and 0.3% of the formula composition are respectively selected and added into the original-proportion concrete with the same quality, and specific test data are shown in Table 5.
TABLE 5 Performance data of concrete without and with waterproof compactors of different mass ratios
It can be seen that the slump of the concrete doped with the waterproof compacting agent is remarkably increased, and the slump is gradually increased according to the doping amount. The concrete mixed with the waterproof compacting agent has the advantages that the fluidity of the concrete is continuously improved, and the material is beneficial to solving the quality defects of root rot and honeycomb dog hole caused by poor fluidity of the concrete; the shrinkage is gradually reduced according to the increase of the blending amount, the strength is increased, the water permeability pressure ratio is increased, the water absorption is reduced, the addition amount of the waterproof compacting agent directly influences the comprehensive performance of the waterproof compacting agent, the larger the addition amount is, the better the performance is, and the addition amount of 0.2% is most suitable in consideration of economic benefit and national requirements on the addition amount of the additive.
The application range of the waterproof compacting agent provided by the invention is as follows:
(1) Engineering with high requirements on crack resistance and permeability resistance, even certain hydrostatic pressure, such as power plants, reservoirs, running water galleries, tunnel culverts, dams, subways, underground underwater structures and the like, so that the structure is self-waterproof;
(2) Foundation engineering, roofing engineering, waterproof maintenance engineering, concrete post-pouring strips of underground culverts, railway and highway tunnels, underground structures of buildings and the like;
(3) The continuous construction of the expansion joint can be reduced or canceled in roads, bridges, airport terraces, parking lots and large-volume concrete projects requiring the expansion joint.
The preferred embodiments of the present invention have been described above, and it should be understood that the preferred embodiments described herein are presented by way of illustration and explanation only, and not limitation.
In the description of the present invention, the terms "connected," "mounted," "secured," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In the description of the present specification, the terms "in the foregoing embodiments," "in some embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The cracking-resistant waterproof compacting agent is characterized by comprising the following components in percentage by weight:
3-8% of sodium dodecyl benzene sulfonate; 3-10% of oleoyl polypeptide complex; silicate 5-15%; 20-40% of calcium hydroxide; 27-69% of water.
2. The waterproof compacting agent of claim 1, wherein,
the waterproof compacting agent comprises the following components in percentage by weight: 3-6% of sodium dodecyl benzene sulfonate; 5.5-7.5% of oleoyl polypeptide complex; 8-11% of silicate; 28-36% of calcium hydroxide; 40-50% of water.
3. The waterproof compacting agent of claim 1, wherein,
the waterproof compacting agent comprises the following components in percentage by weight: 5-6% of sodium dodecyl benzene sulfonate; 6-7% of oleoyl polypeptide complex; 9-10% of silicate; 30-32% of calcium hydroxide; 45-50% of water.
4. The waterproof compacting agent of claim 1, wherein,
sodium dodecyl benzene sulfonate to oleoyl polypeptide complex weight ratio = 1 (1-3).
5. The waterproof compacting agent of claim 2, wherein,
sodium dodecyl benzene sulfonate to oleoyl polypeptide complex weight ratio = 1, (1-2.5).
6. The waterproof compacting agent of claim 1, wherein,
the oleoyl polypeptide complex is one or a combination of more of N-oleoyl polypeptide, N-oleoyl polypeptide sodium polypeptide and N-alkanoyl polypeptide.
7. The waterproof compacting agent of claim 1, wherein,
the silicate is one or more of sodium silicate, lithium silicate, aluminum silicate and calcium silicate.
8. The preparation method of the anti-cracking waterproof compacting agent is characterized by comprising the following steps of:
adding sodium dodecyl benzene sulfonate into water, stirring and dissolving to form a dissolving solution;
adding the oleoyl polypeptide complex into the solution, and uniformly stirring to form a primary solvent;
adding a first part of calcium hydroxide into the primary solvent, and stirring to form an intermediate solvent;
and adding the second part of calcium hydroxide, uniformly stirring, adding silicate, and stirring to form the waterproof compacting agent.
9. The method of claim 8, wherein the mass ratio of the first portion of calcium hydroxide to the second portion of calcium hydroxide is 3:2.
10. The application method of the anti-cracking waterproof compacting agent is characterized in that the waterproof compacting agent is added and used according to 0.16-0.24wt% of the total amount of mortar cement in the concrete.
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