CN107382133A - Concrete early strength agent and preparation method thereof - Google Patents
Concrete early strength agent and preparation method thereof Download PDFInfo
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- CN107382133A CN107382133A CN201710682394.7A CN201710682394A CN107382133A CN 107382133 A CN107382133 A CN 107382133A CN 201710682394 A CN201710682394 A CN 201710682394A CN 107382133 A CN107382133 A CN 107382133A
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- early strength
- strength agent
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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
- C04B40/0042—Powdery mixtures
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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
- C04B2103/10—Accelerators; Activators
- C04B2103/12—Set accelerators
Abstract
The invention discloses a kind of concrete early strength agent and preparation method thereof, include the component of following parts by weight：13 parts of sodium chloride, 13 parts of natrium nitrosum, 10 20 parts of sodium sulphate, 36 parts of calcium chloride, 26 parts of urea, 5 15 parts of methacrylic acid, 13 parts of silane, 15 parts of calcium gluconate, 15 parts of triisopropanolamine, 5 10 parts of fatty glyceride, 50 80 parts of polycarboxylate water-reducer, 24 parts of finely ground cement stone.Beneficial effects of the present invention：It has the advantages of can also allowing concrete rapid draing at low ambient temperatures.
Description
Technical field
The present invention relates to cement outer-penetrating agent, more particularly to a kind of concrete early strength agent and preparation method thereof.
Background technology
In general, concrete works constitutes about the half of whole civil engineering, therefore, the setting rate of concrete for
The duration for shortening civil engineering has a very important role.There is the more raising coagulation used at 10-40 DEG C the country at present
The outer-penetrating agent of native early strength, such as cement-water-clay system early strength agent, there is the advantages of setting time is short, and setting percentage is high.It is more
Nian Lai, concrete early strength agent are all widely used in reinforcement of soft soil, borehole wall slip casting, water leak accident processing etc., solved perhaps
More key issues.Because it is mainly Ca caused by the silicate and hydrated cementitious leaned in sodium metasilicate that concrete, which mixes adhesive curing,2 +Occur
Reaction generation C-S-H gels maintain, so cement-water-clay system has that low temperature intensity is low and Seed harvest poor durability is asked
Topic.When under approximate 4 DEG C of low temperature environment, ordinary cement almost stopped hydration reaction, silicate and Ca in sodium metasilicate2 +
React generation C-S-H gel content wretched insufficiencies, causes concrete low temperature intensity low.The content of calcium is fixed in cement simultaneously
, the calcium hydroxide and the amount of sodium metasilicate and calcium hydroxide reaction of the generation of its aquation are also certain, cross sodium polysilicate to knot
The intensity of stone body is unhelpful, and system intensity may be allowed to decline on the contrary.Because C-S-H gels need high alkalinity to maintain it
It is stabilized, NaOH dissolution can cause C-S-H gel decompositions, cause structure to destroy.When concrete material is done in low temperature
When under the conditions of dry, Silica hydrogel can be dehydrated, and Seed harvest volume contraction cracks, and cause Seed harvest efflorescence not formed effectively strong
Degree.Therefore find less than 10 DEG C or close to used low temperature, ultralow temperature early strength agent under 4 DEG C of low temperature environment be that building trade is mixed
Coagulate the direction of geotechnological journey Future Development.
The content of the invention
It is an object of the invention to provide a kind of concrete early strength agent, and it has can also allow concrete fast at low ambient temperatures
The advantages of rapid-curing cutback is dry.
The present invention above-mentioned technical purpose technical scheme is that：
A kind of concrete early strength agent, include the component of following parts by weight：Sodium chloride 1-3 parts, natrium nitrosum 1-3 parts, sodium sulphate 10-
20 parts, calcium chloride 3-6 parts, urea 2-6 parts, methacrylic acid 5-15 parts, silane 1-3 parts, calcium gluconate 1-5 parts, three isopropyls
Hydramine 1-5 parts, fatty glyceride 5-10 parts, polycarboxylate water-reducer 50-80 parts, finely ground cement stone 2-4 parts.
By using above-mentioned technical proposal, triisopropanolamine, can be with Ca due to a pair of unshared electronics of N atoms2 +With
Fe3 +Deng the complex ion that generation is soluble in water, the solubility of cement particle surface is improved, hinders C3A surfaces form water
Change non-permeable formation at initial stage, promotes C3A and C4AF dissolving, it is accelerated to react generation calcium sulphoaluminate with gypsum.While this
Reaction also reduces calcium ion and aluminum ions concentration in liquid phase, further promotes C3S aquation, so as to promote concrete
Early strength increases.Fe3 +It is high-valence cationic, the diffusion electric double layer of C-S-H colloidal particles can be compressed, so as to accelerates C-
The cohesion of S-H colloidal particles, its concentration in the liquid phase is reduced, to accelerate C3S and C2S aquations, improve early strength.By force
It is p H values that sour weak base salt, which can reduce, accelerates C3S aquation, improve condensation and the setting rate of cement.
The present invention is further arranged to：The polycarboxylate water-reducer is by methyl allyl polyoxyethylene ether, maleic acid
Acid anhydride and propionate are 0.05 according to mol ratio:0.3:0.1 synthesis.
By using above-mentioned technical proposal, by methyl allyl polyoxyethylene ether, maleic anhydride and propionate
The water reducer of synthesis, cement particle surface can be allowed to form adsorbed film, influence the spray speed of cement, allow Behavior of Hardened Cement Paste growth more
To be close, the capillary gap of moisture evaporation is reduced, improves the hardness and compact structure of cement mortar.Maleic anhydride energy
Enough reduce pH value.Contain unsaturated bond in methyl allyl polyoxyethylene ether, can be broken in cement system, mutually interconnect
Bridging is connect, so as to shorten firm time, improves the intensity of concrete.
The present invention is further arranged to：Methyl allyl polyoxyethylene ether, maleic anhydride and propionate are mixed
Conjunction is positioned in reactor, adds 5% hydrogen peroxide, and react 5 hours obtained carboxylic acids under conditions of 80 DEG C and 3MPa and gather
Carboxylic acid water reducer.
By using above-mentioned technical proposal, polycarboxylate water-reducer can be made in profit in this way.
The present invention is further arranged to：The particle diameter of the finely ground cement stone is 0.3 μm.
By using above-mentioned technical proposal, finely ground cement stone provides original nucleating condition, reduces what hydrated product separated out
Energy battier, the hydrated product for making to increase in early days fully grows crystallization, so that the overall construction intensity of Behavior of Hardened Cement Paste is improved.
The present invention is further arranged to：The finely ground cement stone soaks 5h in the chlorination salting liquid that mass fraction is 20%.
By using above-mentioned technical proposal so that the surface attachment of finely ground cement stone has chlorion.Finely ground cement stone and water
After contact, chlorion will be dispersed in water so that allow chlorion by clinker mineral and hydrated product particulate absorption on the surface, because
This is avoided mutually assembling between cement granules agglomerating, increases dispersiveness.
The present invention is further arranged to：Include the component of following parts by weight：2 parts of sodium chloride, 2 parts of natrium nitrosum, sodium sulphate
15 parts, 4 parts of calcium chloride, 6 parts of urea, 12 parts of methacrylic acid, 3 parts of silane, 5 parts of calcium gluconate, 5 parts of triisopropanolamine, fat
8 parts of fatty acid glyceride, 80 parts of polycarboxylate water-reducer, 4 parts of finely ground cement stone.
By using above-mentioned technical proposal, according to 2 parts of sodium chloride, 2 parts of natrium nitrosum, 15 parts of sodium sulphate, 4 parts of calcium chloride,
6 parts of urea, 12 parts of methacrylic acid, 3 parts of silane, 5 parts of calcium gluconate, 5 parts of triisopropanolamine, 8 parts of fatty glyceride, gather
80 parts of carboxylic acid water reducer, the proportioning of 4 parts of finely ground cement stone will obtain the concrete early strength agent of optimal cost performance.
Another goal of the invention of the present invention is to provide a kind of preparation method of concrete early strength agent, comprised the following steps：
By sodium chloride 1-3 parts, natrium nitrosum 1-3 parts, sodium sulphate 10-20 parts, calcium chloride 3-6 parts, urea 2-6 parts, metering system
Sour 5-15 parts, silane 1-3 parts, calcium gluconate 1-5 parts, triisopropanolamine 1-5 parts, fatty glyceride 5-10 parts, polycarboxylic acids
Water reducer 50-80 parts, the mixing of finely ground cement stone 2-4 parts can obtain finished product.
By using above-mentioned technical proposal so that the finished product of concrete early strength agent can be made in people.
In summary, the invention has the advantages that：
1st, the urea in the present invention is surface reactive material, and plastication is played to concrete mix, and it generates solvable with calcium salt
Property double salt is to adjust indissoluble thing crystallization rate, so as to accelerate the hydration process of cement.Other urea can make under the freezing point of liquid phase thing
Drop, reaches cryoprotective effects；
2nd, contain unsaturated bond in the methacrylic acid in the present invention, can be broken in cement system, interconnection is taken
Bridge, so as to shorten firm time, improve the intensity of concrete；
3rd, the fatty glyceride in the present invention reduces the effect of concrete water-cement ratio, improves the intensity of concrete, and thin
Mill Behavior of Hardened Cement Paste provides original nucleating condition, reduces the energy battier that hydrated product separates out, and the hydrated product for making to increase in early days fills
Mitogenetic long crystallization, so that the overall construction intensity of Behavior of Hardened Cement Paste is improved.After fatty glyceride and the combination of finely ground cement stone
Synergy is generated, and enhances freeze proof effect concrete early stage.
Embodiment
This specific embodiment is only explanation of the invention, and it is not limitation of the present invention, people in the art
Member can make the modification of no creative contribution to the present embodiment as needed after this specification is read, but as long as at this
All protected in the right of invention by Patent Law.
Embodiment 1
A kind of concrete early strength agent, including 1 part of sodium chloride, 1 part of natrium nitrosum, 10 parts of sodium sulphate, 3 parts of calcium chloride, 2 parts of urea,
5 parts of methacrylic acid, 1 part of silane, 1 part of calcium gluconate, 1 part of triisopropanolamine, 5 parts of fatty glyceride, polycarboxylic acids diminishing
50 parts of agent, 0.3 μm of 2 parts of finely ground cement stone.
Acquisition is made by the steps in above-mentioned concrete early strength agent：
Step 1：According to mol ratio, methyl allyl polyoxyethylene ether, maleic anhydride and propionate=0.05:0.3:
0.1 weighs methyl allyl polyoxyethylene ether, maleic anhydride and propionate, is positioned in reactor and adds quality
The hydrogen peroxide that fraction is 5% is as initiator；
Step 2：The material allowed in reactor obtains polycarboxylate water-reducer in 80 DEG C and reaction under conditions of 3MPa；
Step 3：0.3 μm of 2 parts of finely ground cement stone is weighed according to parts by weight, described 0.3 μm of finely ground cement stone is in quality point
Number weighs 0.3 μm of 2 parts of finely ground cement stone after immersion, chlorine to soak 5h in 20% sodium chloride solution, according still further to parts by weight
Change 1 part of sodium, 1 part of natrium nitrosum, 10 parts of sodium sulphate, 3 parts of calcium chloride, 2 parts of urea, 5 parts of methacrylic acid, 1 part of silane, glucose
Sour 1 part of calcium, 1 part of triisopropanolamine, 5 parts of fatty glyceride, 50 parts of polycarboxylate water-reducer.It is then that the material weighed is all mixed
Conjunction is put into reactor, can obtain finished product after sufficiently mixing.
Embodiment 2
A kind of concrete early strength agent, including 1.5 parts of sodium chloride, 1.5 parts of natrium nitrosum, 13 parts of sodium sulphate, 4 parts of calcium chloride, urea 3
Part, 8 parts of methacrylic acid, 1.5 parts of silane, 2 parts of calcium gluconate, 2 parts of triisopropanolamine, 6 parts of fatty glyceride, polycarboxylic acids
60 parts of water reducer, 0.3 μm of 2.5 parts of finely ground cement stone.
Acquisition is made by the steps in above-mentioned concrete early strength agent：
Step 1：According to mol ratio, methyl allyl polyoxyethylene ether, maleic anhydride and propionate=0.05:0.3:
0.1 weighs methyl allyl polyoxyethylene ether, maleic anhydride and propionate, is positioned in reactor and adds quality
The hydrogen peroxide that fraction is 5% is as initiator；
Step 2：The material allowed in reactor obtains polycarboxylate water-reducer in 80 DEG C and reaction under conditions of 3MPa；
Step 3：0.3 μm of 2.5 parts of finely ground cement stone is weighed according to parts by weight, described 0.3 μm of finely ground cement stone is in quality
Fraction is to soak 5h in 20% sodium chloride solution, and 0.3 μm of finely ground cement stone 2.5 after immersion is weighed according still further to parts by weight
Part, 1.5 parts of sodium chloride, 1.5 parts of natrium nitrosum, 13 parts of sodium sulphate, 4 parts of calcium chloride, 3 parts of urea, 8 parts of methacrylic acid, silane
1.5 parts, 2 parts of calcium gluconate, 2 parts of triisopropanolamine, 6 parts of fatty glyceride, 60 parts of polycarboxylate water-reducer.It will then weigh
Material all mixing be put into reactor, after sufficiently mixing i.e. can obtain finished product.
Embodiment 3
A kind of concrete early strength agent, including 2 parts of sodium chloride, 2 parts of natrium nitrosum, 15 parts of sodium sulphate, 4 parts of calcium chloride, 6 parts of urea,
12 parts of methacrylic acid, 3 parts of silane, 5 parts of calcium gluconate, 5 parts of triisopropanolamine, 8 parts of fatty glyceride, polycarboxylic acids diminishing
80 parts of agent, 0.3 μm of 4 parts of finely ground cement stone.
Acquisition is made by the steps in above-mentioned concrete early strength agent：
Step 1：According to mol ratio, methyl allyl polyoxyethylene ether, maleic anhydride and propionate=0.05:0.3:
0.1 weighs methyl allyl polyoxyethylene ether, maleic anhydride and propionate, is positioned in reactor and adds quality
The hydrogen peroxide that fraction is 5% is as initiator；
Step 2：The material allowed in reactor obtains polycarboxylate water-reducer in 80 DEG C and reaction under conditions of 3MPa；
Step 3：0.3 μm of 4 parts of finely ground cement stone is weighed according to parts by weight, described 0.3 μm of finely ground cement stone is in quality point
Number weighs 0.3 μm of 4 parts of finely ground cement stone after immersion, chlorine to soak 5h in 20% sodium chloride solution, according still further to parts by weight
Change 2 parts of sodium, 2 parts of natrium nitrosum, 15 parts of sodium sulphate, 4 parts of calcium chloride, 6 parts of urea, 12 parts of methacrylic acid, 3 parts of silane, grape
5 parts of Calciofon, 5 parts of triisopropanolamine, 8 parts of fatty glyceride, 80 parts of polycarboxylate water-reducer.It is then that the material weighed is whole
Mixing is put into reactor, can obtain finished product after sufficiently mixing.
Embodiment 4
A kind of concrete early strength agent, including 2.5 parts of sodium chloride, 2.5 parts of natrium nitrosum, 17 parts of sodium sulphate, 5.5 parts of calcium chloride, urine
4 parts of element, 10 parts of methacrylic acid, 2 parts of silane, 3 parts of calcium gluconate, 3 parts of triisopropanolamine, 9 parts of fatty glyceride, poly- carboxylic
Sour 80 parts of water reducer, 0.3 μm of 3 parts of finely ground cement stone.
Acquisition is made by the steps in above-mentioned concrete early strength agent：
Step 1：According to mol ratio, methyl allyl polyoxyethylene ether, maleic anhydride and propionate=0.05:0.3:
0.1 weighs methyl allyl polyoxyethylene ether, maleic anhydride and propionate, is positioned in reactor and adds quality
The hydrogen peroxide that fraction is 5% is as initiator；
Step 2：The material allowed in reactor obtains polycarboxylate water-reducer in 80 DEG C and reaction under conditions of 3MPa；
Step 3：0.3 μm of 3 parts of finely ground cement stone is weighed according to parts by weight, described 0.3 μm of finely ground cement stone is in quality point
Number weighs 0.3 μm of 3 parts of finely ground cement stone after immersion, chlorine to soak 5h in 20% sodium chloride solution, according still further to parts by weight
Change 2.5 parts of sodium, 2.5 parts of natrium nitrosum, 17 parts of sodium sulphate, 5.5 parts of calcium chloride, 4 parts of urea, 10 parts of methacrylic acid, silane 2
Part, 3 parts of calcium gluconate, 3 parts of triisopropanolamine, 9 parts of fatty glyceride, 70 parts of polycarboxylate water-reducer.It will then weigh
All mixing is put into reactor material, can obtain finished product after sufficiently mixing.
Embodiment 5
A kind of concrete early strength agent, including 3 parts of sodium chloride, 3 parts of natrium nitrosum, 20 parts of sodium sulphate, 6 parts of calcium chloride, 5 parts of urea,
15 parts of methacrylic acid, 2.5 parts of silane, 4 parts of calcium gluconate, 4 parts of triisopropanolamine, 10 parts of fatty glyceride, polycarboxylic acids
75 parts of water reducer, 0.3 μm of 3.5 parts of finely ground cement stone.
Acquisition is made by the steps in above-mentioned concrete early strength agent：
Step 1：According to mol ratio, methyl allyl polyoxyethylene ether, maleic anhydride and propionate=0.05:0.3:
0.1 weighs methyl allyl polyoxyethylene ether, maleic anhydride and propionate, is positioned in reactor and adds quality
The hydrogen peroxide that fraction is 5% is as initiator；
Step 2：The material allowed in reactor obtains polycarboxylate water-reducer in 80 DEG C and reaction under conditions of 3MPa；
Step 3：0.3 μm of 3.5 parts of finely ground cement stone is weighed according to parts by weight, described 0.3 μm of finely ground cement stone is in quality
Fraction is to soak 5h in 20% sodium chloride solution, and 0.3 μm of finely ground cement stone 3.5 after immersion is weighed according still further to parts by weight
Part, 3 parts of sodium chloride, 3 parts of natrium nitrosum, 20 parts of sodium sulphate, 6 parts of calcium chloride, 5 parts of urea, 15 parts of methacrylic acid, silane 2.5
Part, 4 parts of calcium gluconate, 4 parts of triisopropanolamine, 10 parts of fatty glyceride, 75 parts of polycarboxylate water-reducer.It will then weigh
All mixing is put into reactor material, can obtain finished product after sufficiently mixing.
Comparative example 1
Difference with embodiment 3 is the finely ground cement stone of 0.3 μm of removal, and other are constant.
Comparative example 2
Difference with embodiment 3 is removal fatty glyceride, and other are constant.
Comparative example 3
Difference with embodiment 3 is the finely ground cement stone for removing fatty glyceride and 0.3 μm simultaneously, and other are constant.
Concrete strength test
With reference to national standard GB/T 50107-2010 and GB/T 11969-2008 determine respectively embodiment 1, embodiment 2, embodiment 3,
Embodiment 4, embodiment 5, comparative example 1, comparative example 2 and comparative example 3.
Table 1 is the performance indications of the concrete early strength agent of the present invention
From table 1 it follows that with reference to the fatty glyceride and 0.3 in comparative example 1, comparative example 2, comparative example 3 and embodiment 3
μm finely ground cement stone can play a part of strengthen compression strength, but two basic change together after, fatty glyceride
Allow 0.3 μm of finely ground cement stone to disperse in concrete, reduce further the energy battier of hydrated product precipitation, play collaboration
Strengthen the effect of entire compression intensity and anti-freezing property.
The theory analysis of above-mentioned result：Substantial amounts of Ca can be produced after 0.3 μm of finely ground cement stone is under water2 +From
Son, while Cl-Ion on the surface, therefore is avoided mutually interpolymerized between cement granules by clinker mineral and the absorption of hydrated product particulate
Collect agglomerating, enhancing dispersiveness so that the dissolution velocity of cement clinker mineral composition becomes big, accelerates cement initial reaction, accelerates knot
The formation of brilliant product.
Claims (7)
1. a kind of concrete early strength agent, it is characterized in that：Include the component of following parts by weight：Sodium chloride 1-3 parts, natrium nitrosum 1-3
Part, sodium sulphate 10-20 parts, calcium chloride 3-6 parts, urea 2-6 parts, methacrylic acid 5-15 parts, silane 1-3 parts, calcium gluconate
1-5 parts, triisopropanolamine 1-5 parts, fatty glyceride 5-10 parts, polycarboxylate water-reducer 50-80 parts, finely ground cement stone 2-4 parts.
2. concrete early strength agent according to claim 1, it is characterized in that：The polycarboxylate water-reducer is gathered by methacrylic
Oxygen vinethene, maleic anhydride and propionate are 0.05 according to mol ratio:0.3:0.1 synthesis.
3. concrete early strength agent according to claim 2, it is characterized in that：By methyl allyl polyoxyethylene ether, maleic
Dicarboxylic anhydride and propionate mixing are positioned in reactor, add the hydrogen peroxide that mass fraction is 5%, and in 80 DEG C and
5 hours obtained carboxylic acid polycarboxylate water-reducers are reacted under conditions of 3MPa.
4. concrete early strength agent according to claim 1, it is characterized in that：The particle diameter of the finely ground cement stone is 0.3 μm.
5. concrete early strength agent according to claim 1, it is characterized in that：The finely ground cement stone is 20% in mass fraction
Chlorination salting liquid in soak 5h.
6. concrete early strength agent according to claim 1, it is characterized in that：Include the component of following parts by weight：Sodium chloride 2
Part, 2 parts of natrium nitrosum, 15 parts of sodium sulphate, 4 parts of calcium chloride, 6 parts of urea, 12 parts of methacrylic acid, 3 parts of silane, calcium gluconate
5 parts, 5 parts of triisopropanolamine, 8 parts of fatty glyceride, 80 parts of polycarboxylate water-reducer, 4 parts of finely ground cement stone.
7. a kind of preparation method of concrete early strength agent, it is characterized in that：Comprise the following steps：
By sodium chloride 1-3 parts, natrium nitrosum 1-3 parts, sodium sulphate 10-20 parts, calcium chloride 3-6 parts, urea 2-6 parts, metering system
Sour 5-15 parts, silane 1-3 parts, calcium gluconate 1-5 parts, triisopropanolamine 1-5 parts, fatty glyceride 5-10 parts, polycarboxylic acids
Water reducer 50-80 parts, the mixing of finely ground cement stone 2-4 parts can obtain finished product.
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| CN110183140A (en) * | 2019-05-23 | 2019-08-30 | 杭州砺品科技有限公司 | A kind of concrete early strength agent and preparation method thereof |
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