CN112321191A - Nano crystal nucleus early strength type polyarylether water reducer mother liquor, preparation method and compound liquid thereof - Google Patents
Nano crystal nucleus early strength type polyarylether water reducer mother liquor, preparation method and compound liquid thereof Download PDFInfo
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- 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
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- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/32—Polyethers, e.g. alkylphenol polyglycolether
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- 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
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
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Abstract
The invention discloses a nanocrystal core early-strength polyarylether water reducer mother liquor, which comprises the following components in parts by weight of 100: 80-85 parts of a polyarylether water reducing agent; 2-3 parts of a silicon-based component; 0.5-2 parts of a crystal nucleus stabilizer; 2-3 parts of an epichlorohydrin byproduct; 3-4 parts of calcium-based component aqueous solution; 1-3 parts of a dispersion-assisting component; the balance of deionized water; compared with the prior art, the invention has good stability, no retarding effect and high water reducing rate.
Description
Technical Field
The invention relates to the technical field of concrete additives, in particular to a nanocrystal core early-strength polyarylether water reducer mother liquor, a preparation method and a compound liquor thereof.
Background
The country comprehensively considers several factors such as the quality stability of the large-flow-state cast-in-place concrete engineering, energy and manpower consumption, environmental protection and the like, and is vigorously pushing an integrated project of 'assembly type building'; the project matched with the sponge city building method comprises sponge city building and city underground comprehensive pipe gallery building; this requires that different concrete members such as composite slabs, wall panels, duct pieces, beams and pipe piles have high early strength and short setting time on the premise of ensuring normal construction performance, so as to save energy consumption and cost and improve the cycle operation rate and yield of member templates.
At present, the hoisting index of 75% design strength needs to be solved by steaming and increasing the cement consumption in order to realize two shifts, but the energy consumption and the material cost are still high; meanwhile, negative effects of the steam curing on durability and construction are gradually reflected.
At present, the problems are generally solved by adding a water reducing agent into concrete, but the early strength effect of the existing water reducing agent is mainly concentrated in 16-72 h, but the early strength excitation performance for 8-16h is almost blank, so that the early strength effect of cement in the hydration process is poor.
In Chinese patents CN107056120B and CN109485291A, an ether polycarboxylic comb-shaped water reducing agent is still used as a system dispersing component, a formed nanocrystal core is still hydrated calcium silicate to provide crystal seeds, the system can always react to form a flaky substance, the water reducing rate of the system is basically determined according to the using amount, the cost is increased, and the durability of concrete is not good due to the fact that the alkali content of the patent is high.
In the Chinese patent CN109293267A, tricalcium silicate and polycarboxylic acid water reducing agent liquid are mixed and ground, the homogeneity of the water reducing agent is influenced, and the tricalcium silicate reacts with water under the fineness and influences the water reducing rate, so that the early strength effect of cement in the hydration process and the durability of concrete are influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a nanocrystal core early-strength polyarylether water reducer mother liquor to solve the problems of poor early-strength effect of cement in a hydration process and low durability of concrete in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme: the nano crystal nucleus early strength polyarylether water reducer mother liquor comprises the following components in parts by weight of 100:
80-85 parts of a polyarylether water reducing agent;
2-3 parts of a silicon-based component;
0.5-2 parts of a crystal nucleus stabilizer;
2-3 parts of an epichlorohydrin byproduct;
3-4 parts of calcium-based component aqueous solution;
1-3 parts of a dispersion-assisting component;
the balance of deionized water.
Compared with the prior art, the invention has the following beneficial effects:
1. the nano crystal nucleus early strength type polyarylether water reducer mother liquor takes polyarylether water reducer as a main body, and is subjected to complex reaction with silicon-based components, crystal nucleus stabilizer, epichlorohydrin byproduct, calcium-based component water solution, dispersion-assisting components and deionized water, so that the formed nano crystal nucleus early strength type polyarylether water reducer mother liquor has good stability, no retardation effect and high water reduction rate;
2. the nanocrystal core early-strength polyarylether water reducer mother liquor prepared by the method has good early strength performance and no retardation effect, effectively shortens the hydration induction period of cement, can ensure that a prefabricated part has better concrete construction performance in the preparation process, can effectively improve the super early strength of concrete for 8-16h, realizes steam curing free and early mould removal in the preparation process of the prefabricated part, and can effectively reduce energy consumption and expenditure;
3. the polyarylether water reducer is subjected to polycondensation reaction by being matched with other components, so that almost no side chain residue exists in the prepared nano crystal nucleus early-strength polyarylether water reducer mother liquor, the nano crystal nucleus early-strength polyarylether water reducer is basically free of an air entraining effect, the using amount of a defoaming agent is effectively reduced, the cost is reduced, and the apparent state of a component is improved;
4. the nano crystal nucleus early-strength polyarylether water reducer mother liquor not only consumes the solid waste epichlorohydrin by-product, but also achieves the effects of quality improvement and efficiency improvement, further reduces the cost, and provides possibility for comprehensive utilization of organic waste.
Optimally, the viscosity average molecular weight of the polyarylether water reducer is 15000-20000, and the mass concentration is 40%; the general structural formula is as follows:
in the formula, a, b and c are 4-8:1-2: 1;
wherein M is-SO3Na or-COONa, N is-COONa or H, R is H, -CH3or-CH2-CH(CH3)OH，n＝50-100。
The complex formed by the absorption of the carboxylate radicals and the calcium ions is much stronger than the absorption capacity of the polyarylether water reducer and the calcium ions, and is related to steric hindrance on a complex site when the carboxylate radicals and the polyarylether water reducer are complexed with the calcium ions, so that the carboxylate radicals in the polycarboxylate water reducer influence the hydration capacity to be stronger than the capacity of the polyarylether water reducer, and the polyarylether water reducer has almost no retarding effect. The water reduction rate mainly depends on electrostatic repulsion and steric hindrance, the polyarylether water reducing agent still has side chains and has stronger steric hindrance and electrostatic repulsion, and the charge effect of the polyarylether water reducing agent is stronger than that of carboxylate radical, so the water reduction rate is still higher; meanwhile, the polyarylether water reducer is matched with a silicon-based component, a crystal nucleus stabilizer, a byproduct of epoxy chloropropane, a calcium-based component water solution, a dispersion-assisting component and deionized water to perform a complex reaction to form a mother solution, so that a higher water reduction rate is obtained.
Preferably, the silicon-based component is one of sodium silicate, potassium silicate, sodium metasilicate and nano silicon dioxide.
Preferably, the crystal nucleus stabilizer is one of sodium thiocyanate, potassium thiocyanate, sodium sulfate and potassium sulfate.
Optimally, the epichlorohydrin byproduct is NH (CH)2CHOHCH2OH)2And CH2OHCHOHCH2NHCH(CH2OH)2A mixture of (a).
Preferably, the mass concentration of the calcium-based component aqueous solution is 15% -25%, and the solute is one of calcium formate and calcium thiosulfate.
Optimally, the viscosity-average molecular weight of the dispersion-assisting component is 30000-45000, the mass concentration is 50%, and the structural general formula is as follows:
wherein d, e and f are 6-8:1-3: 1;
in the formula R1is-OCH2CH2O-or-OCH2CH2CH2CH2O-，R2Is H or-CH3，g＝130-180。
The invention also adopts the following technical scheme: a preparation method of a nanometer crystal nucleus early-strength polyarylether water reducer mother liquor is characterized by comprising the following steps:
weighing, namely weighing each component according to a ratio;
step two, pretreatment, namely putting the polyarylether water reducing agent, the silicon-based component, the crystal nucleus stabilizer, the epichlorohydrin byproduct and deionized water into a reactor, and uniformly shearing and stirring at the shearing and stirring speed of 3500r/min-5000 r/min;
and step three, final treatment, namely dripping the calcium-based component aqueous solution into the reactor within 10-20min, dripping the dispersion-assisting component into the reactor within 5-10min, continuing to shear and stir for 5-10min, and increasing the shear and stir speed to 6000r/min-7000 r/min.
The invention also adopts the following technical scheme: the compound liquid of the nano crystal nucleus early strength type polyarylether water reducer mother liquid is characterized by comprising the following components in parts by weight of 100:
20-30 parts of a mother solution of a nano crystal nucleus early strength type polyarylether water reducing agent;
2-3 parts of an epichlorohydrin byproduct;
0.5-2 parts of induced hydration component;
the balance of deionized water.
Preferably, the induced hydration component is one of N, N-dimethylacetamide, ammonium sulfate and pAM-DMC, wherein the viscosity average molecular weight of pAM-DMC is 2000-6000, the mass concentration is 40%, and the structural general formula is as follows:
wherein k: p is 1-2: 1.
The invention improves the super early strength of the concrete for 8-16h by three factors: firstly, the sulfonate in the polyarylether type water reducing agent is used as an adsorption group to hardly prolong the setting time of cement so as to enable the cement to normally react; secondly, the formed nano seed crystal can effectively shorten the hydration induction period in the cement hydration process, so that the hydration is further promoted; thirdly, the addition of the hydration inducing component and the epichlorohydrin can promote the cement dissolution process in the cement hydration process, and the N complexing dissolution effect in the structure enables the surface of the silicon-based component to form a melting zone, thereby promoting the hydration of the silicon-based component.
Detailed Description
The present invention will be described in further detail below by way of specific embodiments:
example 1
(1) Preparing a nano crystal nucleus early strength polyarylether water reducer mother liquor: at the temperature of 30 ℃, 80 parts (by weight, the same below) of polyarylether water reducer, 2 parts of sodium silicate, 0.5 part of sodium thiocyanate, 2 parts of epichlorohydrin by-product and 11.5 parts of deionized water are put into a reactor and stirred uniformly, and the shearing stirring speed is 3500 r/min; and then dropping 3 parts of 15% calcium formate aqueous solution in mass concentration into the reactor within 10min, then dropping 1 part of dispersion-assisting component into the reactor within 5min, and then increasing the shearing and stirring speed to 6000r/min and continuing shearing for 5min to obtain the nanocrystal core early-strength polyarylether water reducer mother liquor.
(2) Preparation of a compound liquid (in parts by weight): the nano crystal nucleus early strength type polyarylether water reducer is prepared by mixing 20 parts of nano crystal nucleus early strength type polyarylether water reducer mother liquor, 2 parts of epoxy chloropropane by-products, 0.5 part of N, N-dimethylacetamide and 77.5 parts of deionized water. No. FHPC-1.
The viscosity average molecular weight of the polyarylether water reducer is 15080, and the mass concentration of the polyarylether water reducer is 40%. The structural general formula of the polyarylether water reducing agent is as follows:
wherein a, b and c are 4:1: 1;
wherein M is-SO3Na, N is-COONa, R is H, and N is 50.
The viscosity average molecular weight of the dispersion-assisting component is 30076, the mass concentration is 50%, and the structural general formula of the dispersion-assisting component is as follows:
wherein d, e, f are 6:1: 1;
in the formula R1is-OCH2CH2O-，R2Is H, g 130.
Example 2
(1) Preparing a nano crystal nucleus early strength polyarylether water reducer mother liquor: at the temperature of 80 ℃, 85 parts (by weight, the same below) of polyarylether water reducer, 3 parts of potassium silicate, 2 parts of potassium thiocyanate and 3 parts of epichlorohydrin byproduct are placed into a reactor and uniformly stirred, the shearing stirring speed is 5000r/min, 4 parts of 25 mass percent calcium thiosulfate aqueous solution are dripped into the reactor in 20min, then 3 parts of dispersion-assisting component are dripped into the reactor in 10min, the shearing stirring speed is increased to 7000r/min, and shearing is continued for 10min, so that the nanocrystal core early-strength polyarylether water reducer mother liquor can be obtained.
(2) Preparation of a compound liquid (in parts by weight): the nano crystal nucleus early strength type polyarylether water reducer is prepared by mixing 30 parts of nano crystal nucleus early strength type polyarylether water reducer mother liquor, 3 parts of epoxy chloropropane by-products, 2 parts of ammonium sulfate and 65 parts of deionized water. No. FHPC-2.
The viscosity average molecular weight of the polyarylether water reducer is 20050, and the mass concentration is 40%. The structural general formula of the polyarylether water reducing agent is as follows:
wherein a, b and c are 8:2: 1;
wherein M is-COONa, N is H, and R is-CH3，n＝100。
The viscosity average molecular weight of the dispersion-assisting component is 45077, the mass concentration is 50%, and the structural general formula of the dispersion-assisting component is as follows:
wherein d, e, f are 8:3: 1;
in the formula R1is-OCH2CH2CH2CH2O-，R2is-CH 3, g is 180.
Example 3
(1) Preparing a nano crystal nucleus early strength polyarylether water reducer mother liquor: at 50 ℃, 82 parts (by weight, the same below) of polyarylether water reducer, 2.5 parts of sodium metasilicate, 1 part of sodium sulfate, 2.5 parts of epichlorohydrin by-product and 6.5 parts of deionized water are put into a reactor and uniformly stirred, the shearing and stirring speed is 4000r/min, 3.5 parts of calcium thiosulfate aqueous solution with the mass concentration of 20% are dripped into the reactor within 15min, then 2 parts of dispersion-assisting component are dripped into the reactor within 8min, and then the shearing and stirring speed is increased to 6500r/min and the shearing is continued for 8min, so that the nanometer crystal nucleus early strength polyarylether water reducer mother liquor can be obtained.
(2) Preparation of a compound liquid (in parts by weight): the nano crystal nucleus early strength type polyarylether water reducer is prepared by mixing 25 parts of nano crystal nucleus early strength type polyarylether water reducer mother liquor, 2.5 parts of epichlorohydrin by-products, 1 part of pAM-DMC and 71.5 parts of deionized water. No. FHPC-3.
The viscosity average molecular weight of the polyarylether water reducer is 17050, and the mass concentration of the polyarylether water reducer is 40%. The structural general formula of the polyarylether water reducing agent is as follows:
wherein a, b and c are 6:1.5: 1;
wherein M is-COONa, N is H, and R is-CH2-CH(CH3)OH，n＝80。
The viscosity average molecular weight of the dispersion-assisting component is 38780, the mass concentration is 50%, and the structural general formula of the dispersion-assisting component is as follows:
wherein d, e, f are 7:2: 1;
in the formula R1is-OCH2CH2CH2CH2O-，R2is-CH 3, g is 150.
The viscosity average molecular weight of pAM-DMC is 5788, the mass concentration is 40%, and the structural general formula of pAM-DMC is as follows:
wherein k: p is 1.5: 1.
Example 4
(1) Preparing a nano crystal nucleus early strength polyarylether water reducer mother liquor: at 70 ℃, 82 parts (by weight, the same below) of polyarylether water reducer, 2.5 parts of nano silicon dioxide, 1 part of potassium sulfate, 3 parts of epichlorohydrin byproduct and 5 parts of deionized water are put into a reactor and uniformly stirred, the shearing stirring speed is 5000r/min, 3.5 parts of calcium thiosulfate aqueous solution with the mass concentration of 20% are dripped into the reactor in 15min, then 3 parts of dispersion-assisting component are dripped into the reactor in 10min, and then the shearing stirring speed is increased to 6500r/min and the shearing is continued for 10min, so that the nanocrystal core early-strength polyarylether water reducer mother liquor can be obtained.
(2) Preparation of a compound liquid (in parts by weight): the nano crystal nucleus early strength type polyarylether water reducer is prepared by mixing 25 parts of nano crystal nucleus early strength type polyarylether water reducer mother liquor, 2.8 parts of epichlorohydrin by-products, 2 parts of pAM-DMC and 70.2 parts of deionized water. No. FHPC-4.
The viscosity average molecular weight of the polyarylether water reducer is 18770, and the mass concentration of the polyarylether water reducer is 40%. The structural general formula of the polyarylether water reducing agent is as follows:
wherein a, b and c are 8:1.5: 1;
wherein M is-COONa, N is H, and R is-CH2-CH(CH3)OH，n＝95。
The viscosity average molecular weight of the dispersion-assisting component is 35080, the mass concentration is 50%, and the structural general formula of the dispersion-assisting component is as follows:
wherein d, e, f are 6.5:2.5: 1;
in the formula R1is-OCH2CH2O-，R2Is H, g is 150.
The viscosity average molecular weight of pAM-DMC is 5980, the mass concentration is 40%, and the structural general formula of pAM-DMC is as follows:
wherein k: p is 1.9: 1.
Example 5
(1) Preparing a nano crystal nucleus early strength polyarylether water reducer mother liquor: at 50 ℃, 84 parts (by weight, the same below) of polyarylether water reducer, 2.6 parts of sodium metasilicate, 1.5 parts of potassium thiocyanate, 2.3 parts of epichlorohydrin byproduct and 3.6 parts of deionized water are placed into a reactor and uniformly stirred, the shearing stirring speed is 4500r/min, 4 parts of 25 mass percent calcium thiosulfate aqueous solution are dripped into the reactor within 15min, 2 parts of dispersion-assisting component are dripped into the reactor within 8min, and then the shearing stirring speed is increased to 6500r/min and the shearing is continued for 10 minutes, so that the nanocrystal core early-strength polyarylether water reducer mother liquor can be obtained.
(2) Preparation of a compound liquid (in parts by weight): the nano crystal nucleus early strength type polyarylether water reducer is prepared by mixing 25 parts of nano crystal nucleus early strength type polyarylether water reducer mother liquor, 3 parts of epoxy chloropropane by-products, 2 parts of N, N-dimethylacetamide and 70 parts of deionized water. No. FHPC-5.
The viscosity average molecular weight of the polyarylether water reducer is 16880, and the mass concentration of the polyarylether water reducer is 40%. The structural general formula of the polyarylether water reducing agent is as follows:
wherein a, b and c are 7.5:1.5: 1;
wherein M is-COONa, N is H, and R is-CH2-CH(CH3)OH，n＝70。
The viscosity average molecular weight of the dispersion-assisting component is 35080, the mass concentration is 50%, and the structural general formula of the dispersion-assisting component is as follows:
wherein d, e, f are 7:2: 1;
in the formula R1is-OCH2CH2O-，R2is-CH3，g＝170。
The viscosity average molecular weight of pAM-DMC is 5780, the mass concentration is 40%, and the structural general formula of pAM-DMC is as follows:
wherein k: p is 1.5: 1.
Example 6
(1) Preparing a nano crystal nucleus early strength polyarylether water reducer mother liquor: at 70 ℃, 83 parts (weight parts, the same below) of polyarylether water reducer, 2.5 parts of sodium silicate, 2 parts of potassium sulfate, 3 parts of epichlorohydrin byproduct and 3.5 parts of deionized water are placed into a reactor and uniformly stirred, the shearing stirring speed is 4000r/min, 4 parts of 20 mass percent calcium thiosulfate aqueous solution are dripped into the reactor in 15min, then 2 parts of dispersion-assisting component are dripped into the reactor in 8min, and then the shearing stirring speed is increased to 7000r/min and the shearing is continued for 10min, thus obtaining the nanocrystal core early strength polyarylether water reducer mother liquor.
(2) Preparation of a compound liquid (in parts by weight): the nano crystal nucleus early strength type polyarylether water reducer is prepared by mixing 30 parts of nano crystal nucleus early strength type polyarylether water reducer mother liquor, 3 parts of epoxy chloropropane by-products, 2 parts of ammonium sulfate and 65 parts of deionized water. No. FHPC-6.
The viscosity average molecular weight of the polyarylether water reducing agent is 17650, and the mass concentration is 40%. The structural general formula of the polyarylether water reducing agent is as follows:
wherein a, b and c are 8:2: 1;
wherein M is-SO3Na, N is H, R is H, and N is 56.
The viscosity average molecular weight of the dispersion-assisting component is 38700, the mass concentration is 50%, and the structural general formula of the dispersion-assisting component is as follows:
wherein d, e, f are 8:3: 1;
in the formula R1is-OCH2CH2CH2CH2O-，R2is-CH3，g＝150。
The viscosity average molecular weight of pAM-DMC is 4500, the mass concentration is 40%, and the structural general formula of pAM-DMC is as follows:
in the formula, k: p is 2: 1.
Comparative example 1
And adding 25 parts of common ether high-water-reduction type polycarboxylate superplasticizer with the mass concentration of 40% and 5 parts of common ether slump-retaining type polycarboxylate superplasticizer with the mass concentration of 40% into the stirring kettle, and stirring for 5min to obtain a common polycarboxylate superplasticizer product HPC-1.
Comparative example 2
Adding 25 parts of common ether high-water-reduction type polycarboxylate superplasticizer with the mass concentration of 40%, 5 parts of common ether slump-retaining polycarboxylate superplasticizer with the mass concentration of 40% and 0.05 part of polydimethylsiloxane defoaming agent into a stirring kettle, and stirring for 5min to obtain a common polycarboxylate water reducer product HPC-2.
Comparative example 3
Stirring and dissolving 20 parts of ether high-water-reduction type polycarboxylic acid superplasticizer into 50 parts of deionized water at the temperature of 40 ℃ and the stirring speed of 600r/min, dripping 10 parts of sodium silicate aqueous solution with the mass concentration of 30% and 20 parts of calcium nitrate aqueous solution with the mass concentration of 60% within 5min, and stirring and reacting for 1H to obtain the nanocrystal core C-S-H/PCE gel HPC-3.
Comparative example 4
Stirring and dissolving 25 parts of ether high-water-reduction type polycarboxylic acid superplasticizer into 45 parts of deionized water at the temperature of 40 ℃ and the stirring speed of 600r/min, dripping 10 parts of sodium silicate aqueous solution with the mass concentration of 30% and 20 parts of calcium nitrate aqueous solution with the mass concentration of 60% within 5min, and stirring and reacting for 1H to obtain the nanocrystal core C-S-H/PCE gel HPC-4.
The implementation effect is as follows:
the concrete mixing proportion is cement: mineral powder: sand: stone: water 240: 70: 840: 1080: 130. wherein the cement is P.O42.5, the mineral powder is S95 grade, the fineness modulus of the sand is 2.4, and the continuous gradation of stones is 5-20 mm. Experimental determination and observation show that when the mixing amount of the polycarboxylate water reducer is 0.27%, the concrete compressive strength values and the appearance state of the hardened concrete are obtained at different temperatures (35 ℃, 27 ℃ and 20 ℃) and different time periods (8h, 16h and 28d) of the air content, the air content and the concrete compressive strength values of the examples and the comparative examples 1 and 2. The specific test results are shown in table 1.
TABLE 1 results of the influence of different water reducing agent samples on the concrete Properties
As can be seen from the relevant data in Table 1, compared with the common ether polycarboxylic acid water reducer, the nano induced hydrated polyarylether superplasticizer prepared by adopting the nano crystal nucleus early strength polyarylether water reducer mother liquor, the epichlorohydrin byproduct and the induced hydration component hardly entrains air, has good concrete construction performance and good appearance state after hardening, and has very good early strength performance for 8-16h at different construction temperatures (35 ℃, 27 ℃ and 20 ℃). The mould can be completely disassembled and hoisted at the temperature of more than 20 ℃ within 12-16h, the conversion efficiency of the mould is improved by energy conservation and emission reduction, the 28d strength is not shrunk, and the increase amplitude is good.
To improve the early strength of concrete, it is necessary to shorten the setting time, and if the water reduction rate of cement hydration is further promoted, the early strength is further improved.
The concrete setting time differences of the examples and comparative examples 1 and 2 were first analyzed for setting time alone, using beach pipe 425 cement (cement final setting time 4h45min) with no retarder addition, and a 20 ℃ standard room temperature, as shown in table 2 below:
| classes of water reducing agents | Mixing amount | Slump/extension of concrete | Final setting time (h: min) |
| HPC-1 | 1.5％ | 225/600 | 14:30 |
| HPC-2 | 1.5％ | 223/600 | 14:36 |
| FHPC-1 | 1.5％ | 235/600 | 10:25 |
| FHPC-2 | 1.5％ | 238/600 | 10:14 |
| FHPC-3 | 1.5％ | 236/600 | 10:18 |
| FHPC-4 | 1.5％ | 239/600 | 10:21 |
| FHPC-5 | 1.5％ | 236/600 | 10:17 |
| FHPC-6 | 1.5％ | 237/600 | 10:23 |
TABLE 2
From the above table, it can be analyzed that the nanocrystal core early-strength polyarylether water reducer mother liquor prepared by the invention can shorten the setting time to improve the early strength of concrete, and the main reasons are as follows: the absorption of the polycarboxylate water reducer is absorption formed by the complex reaction of calcium ions and carboxylate radicals, and the complex formed by the absorption of the carboxylate radicals and the calcium ions has the complexing capability which is much stronger than the absorption capability of sulfonate radicals (polyarylether water reducer) and the calcium ions and is related to steric hindrance on a complexing site when the carboxylate radicals, the sulfonate radicals and the calcium ions are complexed. Therefore, the effect of carboxylate radicals in the polycarboxylate water reducer on hydration is stronger than the effect of sulfonate radicals in the polyarylether water reducer. Therefore, the polyarylether type water reducing agent with the sulfonate has almost no retarding effect (similar to naphthalene water reducing agents).
The common polycarboxylic acid water reducing agent on the market can not be used independently, and can be used after being compounded with gel (such as nanocrystal core C-S-H/PCE gel), but after being compounded, the polycarboxylic acid water reducing agent has poor stability and can generate flocculent precipitate; when the nano crystal nucleus early strength type polyarylether water reducer mother liquor prepared by the invention is used, no gel is additionally added for compounding, and the nano crystal nucleus early strength type polyarylether water reducer mother liquor can be used.
The nanocrystal core polyarylether water reducer mother liquor forms a stable structure through rapid shearing on the premise of considering the water reduction rate, no layering phenomenon occurs after water is added into the structure, and the results of the water reduction rate of the concrete of each embodiment, comparative example 3 and comparative example 4 by adopting beach cement are shown in table 3:
TABLE 3
The data in the table 3 are analyzed, and the water reducing rate of the concrete prepared by processing the nano crystal nucleus polyarylether water reducer mother liquor is 3-4 times that of the nano crystal nucleus C-S-H/PCE gel, so that the water reducing rate is greatly improved.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (10)
1. The nanocrystal core early-strength polyarylether water reducer mother liquor is characterized by comprising the following components in parts by weight of 100:
2. the nanocrystal core early-strength polyarylether water reducer mother liquor as claimed in claim 1, wherein: the viscosity average molecular weight of the polyarylether water reducer is 15000-20000, and the mass concentration is 40%; the general structural formula is as follows:
in the formula, a, b and c are 4-8:1-2: 1;
wherein M is-SO3Na or-COONa, N is-COONa or H, R is H, -CH3or-CH2-CH(CH3)OH，n＝50-100。
3. The nanocrystal core early-strength polyarylether water reducer mother liquor as claimed in claim 1, wherein: the silicon-based component is one of sodium silicate, potassium silicate, sodium metasilicate and nano silicon dioxide.
4. The nanocrystal core early-strength polyarylether water reducer mother liquor as claimed in claim 1, wherein: the crystal nucleus stabilizer is one of sodium thiocyanate, potassium thiocyanate, sodium sulfate and potassium sulfate.
5. The nanocrystal core early-strength polyarylether water reducer mother liquor as claimed in claim 1, wherein: the byproduct of the epoxy chloropropane is NH (CH)2CHOHCH2OH)2And CH2OHCHOHCH2NHCH(CH2OH)2A mixture of (a).
6. The nanocrystal core early-strength polyarylether water reducer mother liquor as claimed in claim 1, wherein: the mass concentration of the calcium-based component water solution is 15% -25%, and the solute is one of calcium formate and calcium thiosulfate.
7. The nanocrystal core early-strength polyarylether water reducer mother liquor as claimed in claim 1, wherein: the viscosity-average molecular weight of the dispersion-assisting component is 30000-45000, the mass concentration is 50%, and the structural general formula is as follows:
wherein d, e and f are 6-8:1-3: 1;
in the formula R1is-OCH2CH2O-or-OCH2CH2CH2CH2O-，R2Is H or-CH3，g＝130-180。
8. The preparation method of the nano crystal nucleus early strength type polyarylether water reducer mother liquor as claimed in any one of claims 1 to 7, characterized by comprising the following steps:
weighing, namely weighing each component according to a ratio;
step two, pretreatment, namely putting the polyarylether water reducing agent, the silicon-based component, the crystal nucleus stabilizer, the epichlorohydrin byproduct and deionized water into a reactor, and uniformly shearing and stirring at the shearing and stirring speed of 3500r/min-5000 r/min;
and step three, final treatment, namely dripping the calcium-based component aqueous solution into the reactor within 10-20min, dripping the dispersion-assisting component into the reactor within 5-10min, continuing to shear and stir for 5-10min, and increasing the shear and stir speed to 6000r/min-7000 r/min.
9. The compound liquid containing the nano crystal nucleus early strength type polyarylether water reducer mother liquid as claimed in any one of claims 1 to 7 is characterized by comprising the following components in parts by weight of 100:
20-30 parts of a mother solution of a nano crystal nucleus early strength type polyarylether water reducing agent;
2-3 parts of an epichlorohydrin byproduct;
0.5-2 parts of induced hydration component;
the balance of deionized water.
10. The compound liquid containing the nanocrystal core early-strength polyarylether water reducer mother liquid as claimed in claim 9, wherein the induced hydration component is one of N, N-dimethylacetamide, ammonium sulfate and pAM-DMC, wherein the viscosity average molecular weight of pAM-DMC is 2000-6000, the mass concentration is 40%, and the structural general formula is as follows:
wherein k: p is 1-2: 1.
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