CN104402288A - Calcium silicate hydrate gel solution early strength agent and preparation method thereof - Google Patents
Calcium silicate hydrate gel solution early strength agent and preparation method thereof Download PDFInfo
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- CN104402288A CN104402288A CN201410593398.4A CN201410593398A CN104402288A CN 104402288 A CN104402288 A CN 104402288A CN 201410593398 A CN201410593398 A CN 201410593398A CN 104402288 A CN104402288 A CN 104402288A
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Abstract
The invention discloses a calcium silicate hydrate gel solution early strength agent and a preparation method thereof, and relates to the technical field of construction material production. The early strength agent and the method are used for solving problems of complicated preparation process, high cost, storage difficulty, weighing difficulty, and poor early strength effect of traditional calcium silicate hydrate powder. The calcium silicate hydrate gel solution early strength agent comprises a calcareous material, a siliceous material, a gel dispersant, and water. A weight ratio of the calcareous material to the siliceous material is 0.3-3:1. A weight ratio of water to the total of the calcareous material and the siliceous material is 5-30:1. The mass percentage of the gel dispersant is 0.01-0.50%. The preparation method of the early strength agent comprises the following steps: reaction materials are weighed; a sodium silicate water solution and a calcium nitrate water solution are respectively prepared; the gel dispersant is respectively added into the solutions; and the two solutions are mixed and allowed to react for a certain period of time. The early strength agent is convenient to store, transport and weigh, and have good product stability. With the early strength agent, cement-based material early strength can be effectively improved.
Description
Technical field
The present invention relates to material of construction production technical field, be specifically related to a kind of hydrated calcium silicate gel solution hardening accelerator and preparation method thereof.
Background technology
Hardening accelerator is a kind of additive accelerating hydrated cementitious, improve cement-based material early strength.Hydrated calcium silicate (C-S-H) is a kind of common hardening accelerator.Usually, choose water glass and nitrocalcite as siliceous material and calcareous material, carry out solution reaction legal system for hydrated calcium silicate.Specifically, in the preparation process of laboratory, first by certain calcium silicon than and water-solid ratio water glass and nitrocalcite weighed and be dissolved in water; Then by lysigenous sodium silicate solution and ca nitrate soln mixing, add deionized water simultaneously, react under water bath condition; Finally, question response completely after products therefrom carried out wash, suction filtration, drying process process, thus obtain hydrated calcium silicate powder.The hydrated calcium silicate of this pulverulence directly can be used as hardening accelerator.
But, there is following problem in aforementioned hydrated calcium silicate preparation method: one is that hydrated calcium silicate product exists with powder morphology, because in engineer applied, volume is little, therefore weigh difficulty, error is larger, powder disperses inequality in concrete mix, affects the quality of cement-based material; Two is need the operation such as drying and grinding in hydrated calcium silicate powder preparing processes, and equipment investment is comparatively large, and preparation cost is higher; Three is generally to carry out the steps such as water bath with thermostatic control, the regulation and control of reaction soln basicity and reaction product washed with de-ionized water in the reaction process preparing hydrated calcium silicate powder, and preparation section is more loaded down with trivial details.
Therefore, simple, convenient hydrated calcium silicate gel solution hardening accelerator stored and weigh of a kind of preparation section and preparation method thereof how is provided to become those skilled in the art's technical problem urgently to be resolved hurrily.
Summary of the invention
The object of the present invention is to provide a kind of hydrated calcium silicate gel solution hardening accelerator and preparation method thereof, with solve traditional hydrated calcium silicate powder preparation complex procedures, cost higher, not easily store and weigh, problem that early potent fruit is undesirable.
To achieve these goals, technical scheme of the present invention is:
A kind of hydrated calcium silicate gel solution hardening accelerator, its raw material comprises: calcareous material, siliceous material, gel dispersal agent and water, the weight ratio of wherein said calcareous material and described siliceous material is 0.3 ~ 3:1, the weight of described water is 5 ~ 30:1 with the gross weight ratio of described calcareous material and described siliceous material, and the massfraction of described gel dispersal agent is 0.01% ~ 0.50%.
Further, described gel dispersal agent is the high molecular polymers such as naphthalenesulfonate formaldehyde condensation compound.
Further, described siliceous material is water glass powder.
Further, described calcareous material is nitrocalcite crystal.
A preparation method for hydrated calcium silicate gel solution hardening accelerator, comprises the steps:
Step one: described in precise, water glass powder, nitrocalcite crystal and water are for subsequent use;
Step 2: be two parts by the moisture described in step one, a for preparing the aqueous solution of described water glass, another part for preparing the aqueous solution of described nitrocalcite, and stirs the scheduled time respectively, and the described scheduled time is 5s ~ 60s;
Step 3: adding described massfraction respectively in the aqueous solution of described water glass and the aqueous solution of described nitrocalcite is 0.01% ~ 0.50% gel dispersal agent, and stirs 5s ~ 60s;
Step 4; By the aqueous solution of the aqueous solution of described water glass and described nitrocalcite, and stir certain hour, described certain hour is 30s ~ 420s, namely generates described C-S-H gelating soln hardening accelerator.
Further, the mol ratio of described calcareous material and described siliceous material is 1:1, and the weight of described water is 5:1 with the gross weight ratio of described calcareous material and described siliceous material, and the massfraction of described gel dispersal agent is 0.20%; The scheduled time in described step 2 is 30s; Certain hour in described step 4 is 420s.
Further, the mol ratio of described calcareous material and described siliceous material is 0.8:1, and the weight of described water is 10:1 with the gross weight ratio of described calcareous material and described siliceous material, and the massfraction of described gel dispersal agent is 0.30%; The scheduled time in described step 2 is 45s; Certain hour in described step 4 is 300s.
Compared with prior art, tool has the following advantages and beneficial effect in the present invention:
1, hydrated calcium silicate gel solution hardening accelerator of the present invention, comprise: calcareous material, siliceous material, gel dispersal agent and water, wherein the weight ratio of calcareous material and siliceous material is 0.3 ~ 3:1, the weight of water is 5 ~ 30:1 with the gross weight ratio of calcareous material and siliceous material, and the massfraction of gel dispersal agent is 0.01% ~ 0.50%.This hydrated calcium silicate gel solution hardening accelerator is not compared with adding the cement-based material of hardening accelerator, and 1d folding strength improves 27.6%, and ultimate compression strength improves 129.4%; Lifting amplitude is 2.16 times, 4.92 times of traditional hydrated calcium silicate powder hardening accelerator respectively.And this hardening accelerator exists with mixed style, can standing storage, convenient transport with weigh, the dispersing uniformity of this hardening accelerator in mixing solutions and stability can be kept preferably.
2, first precise water glass powder of the present invention, nitrocalcite crystal and water are for subsequent use; Then sodium silicate aqueous solution and calcium nitrate aqueous solution is prepared respectively; Then in the aqueous solution of water glass and the aqueous solution of nitrocalcite, adding massfraction is respectively 0.01% ~ 0.50% gel dispersal agent; Finally two kinds of solution hybrid reaction certain hours of gel dispersal agent will be added with, i.e. obtained hydrated calcium silicate gel solution hardening accelerator.This preparation method can carry out at normal temperatures, without the need to water bath with thermostatic control, the regulation and control of reaction soln basicity and reaction product washed with de-ionized water, drying and grinding, also without the need to suction filtration and redispersion, easy and simple to handle, greatly reduce the equipment investment in preparation process, provide cost savings.
Embodiment
Below in conjunction with specific embodiment, hydrated calcium silicate gel solution hardening accelerator of the present invention and preparation method thereof is described in further detail.According to the following describes and claims, advantages and features of the invention will be clearer.
Embodiment one
A kind of hydrated calcium silicate gel solution hardening accelerator, its raw material comprises: calcareous material, siliceous material, gel dispersal agent and water, wherein the weight ratio of calcareous material and siliceous material is 0.3 ~ 3:1, the weight of water is 5 ~ 30:1 with the gross weight ratio of calcareous material and siliceous material, and the massfraction of gel dispersal agent is 0.01% ~ 0.50%.
Specifically, in order to draw materials conveniently, siliceous material is water glass powder, and calcareous material is nitrocalcite crystal.Calculate the consumption of water glass, nitrocalcite and water respectively according to the weight ratio of the gross weight ratio (i.e. water-solid ratio) of the weight of water and calcareous material and siliceous material, calcareous material and siliceous material (calcium silicon than), and precise is for subsequent use.And, the present invention selects the high molecular polymers such as naphthalenesulfonate formaldehyde condensation compound as gel dispersal agent, this gel dispersal agent is the composite prod of high molecular polymer and small organic molecule, and this gel dispersal agent can significantly improve the dispersion effect of gel in mixing solutions.In addition, this gel of calcium silicate solution exists with mixed style, can standing storage, effectively can keep the homogeneity of gel of calcium silicate system, is convenient to transport.And when using this gel of calcium silicate solution as hardening accelerator, it is convenient to weigh, and weighing error is little.
Embodiment two
The raw material of hydrated calcium silicate gel solution hardening accelerator is: the mol ratio of calcareous material and siliceous material is 1:1, and the weight of water is 5:1 with the gross weight ratio of calcareous material and siliceous material, and the massfraction of gel dispersal agent is 0.20%.Now, when preparing hydrated calcium silicate gel solution, need respectively to stir 20s during the aqueous solution of the preparation aqueous solution of water glass and nitrocalcite, need respectively after adding dispersion agent to stir 30s, and, during the reactant aqueous solution of the aqueous solution of water glass and nitrocalcite, need to stir 360s.Finally making the product obtained is milky gel state liquid, is hydrated calcium silicate gel mixing solutions.Now, in this hydrated calcium silicate gel mixing solutions, the massfraction of hydrated calcium silicate is about 5%.
Embodiment three
The raw material of hydrated calcium silicate gel solution hardening accelerator is: the mol ratio of calcareous material and siliceous material is 0.8:1, and the weight of water is 10:1 with the gross weight ratio of calcareous material and siliceous material, and the massfraction of gel dispersal agent is 0.30%.Now, when preparing hydrated calcium silicate gel solution, need respectively to stir 25s during the aqueous solution of the preparation aqueous solution of water glass and nitrocalcite., need respectively after adding dispersion agent to stir 45s, and, during the reactant aqueous solution of the aqueous solution of water glass and nitrocalcite, need to stir 300s.Finally making the product obtained is milky gel state liquid, is hydrated calcium silicate gel mixing solutions.Now, in this hydrated calcium silicate gel mixing solutions, the massfraction of hydrated calcium silicate is about 3%.
Especially, potent fruit morning of hydrated calcium silicate gel solution of the present invention for convenience of explanation, inventors performed cement paste experiment, and predetermined hardening accelerator volume 1%, water cement ratio 0.35.Cement quality is 1500g, now needs 15g hydrated calcium silicate solute.
As shown in table (), for the present invention makes the hydrated calcium silicate gel solution that obtains and the traditional pulverous hydrated calcium silicate effectiveness comparison for cement-based material hardening accelerator.Relatively the length of time is 1 day.
Table (one)
As can be seen from table (), with the addition of the cement-based material of traditional hydrated calcium silicate powder compared with not adding the cement-based material of hardening accelerator, after one day, folding strength improves 12.8%, ultimate compression strength improves 26.3%, and early potent fruit is general.And with the addition of the cement-based material of hydrated calcium silicate gel solution that the present invention makes compared with not adding the cement-based material of hardening accelerator, after one day, folding strength improves 27.6%, and ultimate compression strength improves 129.4%.Therefore, the hydrated calcium silicate gel solution hardening accelerator that the present invention makes compared with traditional hydrated calcium silicate powder hardening accelerator, 1d (my god) folding strength that promotes is about the former 2.16 times; 1d (my god) ultimate compression strength that promotes is about the former 4.92 times.It can thus be appreciated that, strong Be very effective morning of hydrated calcium silicate gel solution of the present invention.And also found by this experiment, add the cement-based material of the hydrated calcium silicate gel solution that the present embodiment makes, slurry fluidity is good, without the bad phenomenon such as bleeding, segregation.
Embodiment four
Hydrated calcium silicate (C-S-H) gelating soln preparation method, comprises the steps:
Step one: precise water glass powder, nitrocalcite crystal and water are for subsequent use;
Step 2: be two parts by the moisture in step one, a for preparing the aqueous solution of water glass, another part for preparing the aqueous solution of nitrocalcite, and stirs 5s ~ 60s respectively;
Step 3: adding massfraction respectively in the aqueous solution of water glass and the aqueous solution of nitrocalcite is 0.01% ~ 0.50% gel dispersal agent, and stirs 5s ~ 60s;
Step 4; By the aqueous solution of water glass and the aqueous solution of nitrocalcite, and stir 30s ~ 420s, namely generate C-S-H gelating soln mixed type hardening accelerator.
Especially, preparing in hydrated calcium silicate gel solution processes, only needing to prepare the aqueous solution of water glass and the aqueous solution of nitrocalcite in advance; Then in two kinds of solution, add the gel dispersal agent of appropriate concentration respectively; Most latter two solution mixing system becomes C-S-H gelating soln mixed type hardening accelerator.This preparation method without the need to water bath with thermostatic control, without the need to regulate and control reaction soln basicity, without the need to reaction product washed with de-ionized water, without the need to dry and grinding, do not need suction filtration and redispersion yet.This preparation method's operation is simple, greatly reduces the equipment investment in preparation process, reduces the preparation cost of C-S-H gelating soln mixed type hardening accelerator.In addition, gel dispersal agent is added respectively in the aqueous solution of water glass and the aqueous solution of nitrocalcite in advance, be conducive to strengthening the dispersion effect of gel in mixing solutions.Therefore, C-S-H gel can be dispersed in the solution, is conducive to this hardening accelerator being uniformly distributed in concrete mix, thus effectively can improve the early strength of cement-based material.And because last reaction product is hydrated calcium silicate gel, be fluffy solid, gel, under water suction and self gravitation effect, can sink, cause skewness.Therefore by adding the gel dispersal agent comprising the composite prod composition of high molecular polymer and small organic molecule that massfraction is 0.01% ~ 0.50%, not only increase the stability of solution, improve the homogeneity that hydrated calcium silicate gel disperses in the solution, and this gel dispersal agent also serves water-reducing effect to a certain extent, thus can not add in the subsequent technique of cement-based material or few interpolation minimizing agent, save engineering cost.
In sum, hydrated calcium silicate gel solution hardening accelerator of the present invention, comprise: calcareous material, siliceous material, gel dispersal agent and water, wherein the weight ratio of calcareous material and siliceous material is 0.3 ~ 3:1, the weight of water is 5 ~ 30:1 with the gross weight ratio of calcareous material and siliceous material, and the massfraction of gel dispersal agent is 0.01% ~ 0.50%.This hydrated calcium silicate gel solution hardening accelerator is not compared with adding the cement-based material of hardening accelerator, and 1d folding strength improves 27.6%, and ultimate compression strength improves 129.4%; Lifting amplitude is 2.16 times, 4.92 times of traditional hydrated calcium silicate powder hardening accelerator respectively, early strong Be very effective.And this hardening accelerator exists with mixed style, can standing storage, convenient transport with weigh, the homogeneity of product can be kept preferably.The preparation method of this hydrated calcium silicate gel solution hardening accelerator, first precise water glass powder, nitrocalcite crystal and water are for subsequent use; Then sodium silicate aqueous solution and calcium nitrate aqueous solution is prepared respectively; Then in the aqueous solution of water glass and the aqueous solution of nitrocalcite, adding massfraction is respectively 0.01% ~ 0.50% gel dispersal agent; Finally two kinds of solution hybrid reaction certain hours of gel dispersal agent will be added with, i.e. obtained hydrated calcium silicate gel solution hardening accelerator.This preparation method can carry out at normal temperatures, without the need to water bath with thermostatic control, the regulation and control of reaction soln basicity and reaction product washed with de-ionized water, drying and grinding, also without the need to suction filtration and redispersion, easy and simple to handle, greatly reduce the equipment investment in preparation process, provide cost savings.In addition, owing to adding gel dispersal agent respectively in the aqueous solution of water glass and the aqueous solution of nitrocalcite in advance, and then by two kinds of solution mixing systems for hydrated calcium silicate gel solution, more be conducive to dispersed in mixing solutions of hydrated calcium silicate gel, thus improve the stability of this hardening accelerator further.
Foregoing description is only the description to present pre-ferred embodiments, any restriction not to the scope of the invention.Any change that those skilled in the art does according to above-mentioned disclosure, modification, all belong to the protection domain of claim.
Claims (7)
1. a hydrated calcium silicate gel solution hardening accelerator, it is characterized in that, its raw material comprises: calcareous material, siliceous material, gel dispersal agent and water, the weight ratio of wherein said calcareous material and described siliceous material is 0.3 ~ 3:1, the weight of described water is 5 ~ 30:1 with the gross weight ratio of described calcareous material and described siliceous material, and the massfraction of described gel dispersal agent is 0.01% ~ 0.50%.
2. hydrated calcium silicate gel solution hardening accelerator as claimed in claim 1, it is characterized in that, described gel dispersal agent is the high molecular polymers such as naphthalenesulfonate formaldehyde condensation compound.
3. hydrated calcium silicate gel solution hardening accelerator as claimed in claim 1 or 2, it is characterized in that, described siliceous material is water glass powder.
4. hydrated calcium silicate gel solution hardening accelerator as claimed in claim 1 or 2, it is characterized in that, described calcareous material is nitrocalcite crystal.
5. the preparation method of the hydrated calcium silicate gel solution hardening accelerator as described in any one of Claims 1-4, is characterized in that, comprise the steps:
Step one: described in precise, water glass powder, nitrocalcite crystal and water are for subsequent use;
Step 2: be two parts by the moisture described in step one, a for preparing the aqueous solution of described water glass, another part for preparing the aqueous solution of described nitrocalcite, and stirs the scheduled time respectively, and the described scheduled time is 5s ~ 60s;
Step 3: adding described massfraction respectively in the aqueous solution of described water glass and the aqueous solution of described nitrocalcite is 0.01% ~ 0.50% gel dispersal agent, and stirs 5s ~ 60s;
Step 4; By the aqueous solution of the aqueous solution of described water glass and described nitrocalcite, and stir certain hour, described certain hour is 30s ~ 420s, namely generates described C-S-H gelating soln hardening accelerator.
6. preparation method as claimed in claim 5, it is characterized in that, the mol ratio of described calcareous material and described siliceous material is 1:1, and the weight of described water is 5:1 with the gross weight ratio of described calcareous material and described siliceous material, and the massfraction of described gel dispersal agent is 0.20%; The scheduled time in described step 2 is 30s; Certain hour in described step 4 is 420s.
7. preparation method as claimed in claim 5, it is characterized in that, the mol ratio of described calcareous material and described siliceous material is 0.8:1, and the weight of described water is 10:1 with the gross weight ratio of described calcareous material and described siliceous material, and the massfraction of described gel dispersal agent is 0.30%; The scheduled time in described step 2 is 45s; Certain hour in described step 4 is 300s.
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