CN110627408A - High-thixotropy water-reducing paste material, pervious concrete using high-thixotropy water-reducing paste material and concrete preparation method - Google Patents
High-thixotropy water-reducing paste material, pervious concrete using high-thixotropy water-reducing paste material and concrete preparation method 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses a high thixotropic water-reducing paste material which comprises the following components in percentage by weight: 10-35% of water reducing agent, 0.5-2.0% of gas-phase silicon dioxide, 1.0-5.0% of silica sol, 0.1-0.2% of inorganic stabilizer, 0.01-0.1% of coupling agent and the balance of water; the high-thixotropy water-reducing paste material is simple in preparation process and environment-friendly, reduces necessary unit water consumption, saves water, reduces the water-cement ratio of pervious concrete, improves the durability of the prepared pervious concrete, and prolongs the service life of the pervious concrete; in addition, the invention discloses pervious concrete using the high thixotropic water-reducing paste material, which comprises the following components in parts by weight: 450 parts of cement 350-; the pervious concrete using the high-thixotropic water-reducing paste material has the advantages that the high-thixotropic water-reducing paste material is used for preparing the pervious concrete, the using amount of an additive is reduced, the using cost of the material is reduced, and water is saved.
Description
Technical Field
The invention relates to the field of water reducing agents, in particular to a high-thixotropy water-reducing paste, pervious concrete using the high-thixotropy water-reducing paste and a preparation method of the pervious concrete.
Background
Along with the vigorous promotion of the country and the place to the construction of 'sponge cities' from top to bottom and the low-influence development of rainwater systems, more and more cities and regions are added. As one of the important components of low impact development facilities, pervious concrete is widely used in the construction of urban roads, squares, and residential roads and parking lots.
The pervious concrete has the characteristics of porous communication structure, large porosity and the like, can permeate rainwater downwards, increases urban underground water resources, improves urban climate and relieves urban waterlogging. The preparation of pervious concrete usually needs to be doped with a certain amount of water reducing agent, and the water consumption for mixing can be reduced and the concrete strength can be improved under the condition that the workability of the pervious concrete and the cement consumption are not changed; or under the condition of unchanged workability and strength, the dosage of cement is saved
At present, a Chinese patent with publication number CN102452806A discloses a novel melamine water reducer and a preparation method thereof, and the raw materials comprise the following components in percentage by mass: 18.7-23.2% of melamine, 38-42.6% of formaldehyde, 20-27% of sodium bisulfite, 2-3% of sulfuric acid, 3-5% of liquid alkali and 20-30% of water. Firstly, adding water, melamine and formaldehyde solution into a reaction kettle, stirring and heating to 50-60 ℃, reacting for 1-3 hours, keeping the temperature at 60-75 ℃, reacting for 1-5 hours, and adjusting the pH value of the solution to 8.5-9.5 by using a liquid alkali solution; adding sodium bisulfite, heating, reacting at 84-90 deg.C for 1-3 hr, and maintaining pH at 10-11; finally, the temperature of the solution is reduced to 50 ℃, the pH value is adjusted to 5-6.5 by 30 percent sulfuric acid, and the reaction is continued for 1-2 hours; neutralizing until the pH value is 7, and discharging to obtain a finished product.
The novel melamine water reducer disclosed above has the following defects in the actual use process:
(1) there is a health risk: the raw materials for producing the water reducing agent contain irritant gas formaldehyde which is a carcinogen, so that potential health risks and high environmental pollution risks exist;
(2) the operation process is complex: when the water reducing agent is produced, water, melamine and formaldehyde solution are sequentially added into a reaction kettle provided with a thermometer, a condenser and a stirrer and stirred; heating to 50-60 deg.C, reacting for 1-3 hr, keeping the temperature at 60-75 deg.C, reacting for 1-5 hr, and adding 32% solution after the end of the hydroxymethylation reaction; adjusting the pH value of the solution to 8.5-9.5 by using an alkali solution; adding sodium bisulfite into the reaction kettle after hydroxymethylation, heating to 84 ℃, reacting for 1-3 hours at 84-90 ℃, and maintaining the pH of the solution at 10-11; when the sulfonation reaction is finished, reducing the temperature of the solution to 50 ℃, and adjusting the pH value of the system to 5-6.5 by using sulfuric acid; and continuously reacting for 1-2 hours, and then neutralizing until the pH value is 7, and discharging to obtain the finished product of the water reducing agent. From the preparation process, repeated adjustment of precise temperature and pH value is needed, so that the preparation process is high in requirement and complex.
Therefore, the problem to be solved in the industry is how to prepare the water reducing agent which is healthy and environment-friendly and has simple preparation process.
Disclosure of Invention
Aiming at the defects in the prior art, the first purpose of the invention is to provide a high-thixotropy water-reducing paste material which has the advantages of simple and environment-friendly preparation process, and simultaneously reduces the necessary unit water consumption and saves water.
In order to achieve the first object, the invention provides the following technical scheme: a high thixotropic water-reducing paste comprises the following components in percentage by weight:
10 to 35 percent of water reducing agent,
0.5 to 2.0 percent of gas phase silicon dioxide,
1.0 to 5.0 percent of silica sol,
0.1 to 0.2 percent of inorganic stabilizer,
0.01 to 0.1 percent of coupling agent,
the balance of water.
By adopting the technical scheme, the water reducing agent is adopted to reduce the necessary unit water consumption in the preparation of the pervious concrete and enhance the hydration efficiency, so that the water-cement ratio of the pervious concrete is reduced, the strength of the concrete is improved, the fluidity of the pervious concrete is improved, and the workability of the concrete is improved; the fumed silica is used as a thixotropic agent, so that particles in concrete are dispersed, hydrogen bonding is generated among different particles through silicon hydroxyl on the surface of the particles to form a three-dimensional network structure, and the fluidity of the concrete is improved under the action of external force, so that stones and permeable aggregates in the concrete cannot be separated and doped; the silica sol is used for enhancing the permeability of concrete, and the penetrated colloidal particles expand to ensure that the coating is firmly bonded on a wall; the inorganic stabilizer is used as an auxiliary agent, so that the mixing stability of the raw materials of the concrete is improved; the coupling agent is used as an auxiliary agent, so that the mixing uniformity of the raw materials is improved, and the compactness of the concrete is further improved.
Further, the water reducing agent comprises a melamine water reducing agent and a polycarboxylic acid water reducing agent, wherein the melamine water reducing agent accounts for 5-15% of the total weight of the high-thixotropy water reducing paste, and the polycarboxylic acid water reducing agent accounts for 5-20% of the total weight of the high-thixotropy water reducing paste.
By adopting the technical scheme, the polycarboxylate superplasticizer has a super-dispersion effect, and the melamine superplasticizer and the polycarboxylate superplasticizer have good compatibility, so that the mixing ratio is obviously superior to that of pure melamine or polycarboxylate.
Further, the water reducing agent is liquid.
By adopting the technical scheme, the water reducing agent has a dispersing effect on cement particles of pervious concrete, and the liquid water reducing agent can further reduce the using amount of water when preparing the concrete, so that the water cement ratio of the pervious concrete is reduced, and the strength of the concrete is greatly improved; meanwhile, the preparation process time is shortened.
Further, the silica sol is alkaline silica sol, and the pH value is 8-10.
By adopting the technical scheme, the interior of the concrete is in an alkaline environment when cement in the concrete is hydrated, and the alkaline silica sol is adapted to the alkaline environment of the cement in the concrete, so that the concrete stably exists, the reduction of the surface area and the dispersibility of silicon dioxide in the concrete caused by particle agglomeration is avoided, and the hydration activity and the flowability of the concrete cement are further improved.
Further, the inorganic stabilizer is sodium alginate.
By adopting the technical scheme, the sodium alginate is a high-viscosity high-molecular compound, has good hydrophilicity, does not need to control the temperature in the preparation process, and thus has good viscosity and fluidity, and meanwhile, the sodium alginate is a linear high-molecular electrolyte, is easy for the construction of concrete, has the function of preventing cracking, and thus improves the strength of the concrete.
The second purpose of the invention is to provide the pervious concrete of the high thixotropic water-reducing paste material, which has the advantages that the high thixotropic water-reducing paste material is used for preparing the pervious concrete, the using amount of the additive is reduced, the using cost of the material is reduced, and the water is saved.
In order to achieve the second object, the invention provides the following technical scheme: the pervious concrete of the high-thixotropy water-reducing paste material comprises the following components in parts by weight:
350 parts of cement and 450 parts of cement,
1410 portions of stone 1202 and stone powder,
110 portions of water and 130 portions of water,
5-10 parts of high-thixotropy water-reducing paste.
By adopting the technical scheme, cement is used as a cementing material, and the cement and water have hydration reaction, so that the prepared concrete is very hard, and the strength of the pervious concrete is improved; the stones are used as aggregates, have the function of supporting and enhance the strength of the integral pervious concrete; the high thixotropic water-reducing paste is used as an additive, so that the hydration activity of cement is improved, the cement ash property of the prepared pervious concrete is reduced, and the flowability of the pervious concrete and the workability in the construction process are further enhanced; meanwhile, the preparation process reduces the use of water and saves water.
Furthermore, the addition amount of the high thixotropic water reducing paste material in the pervious concrete is 0.3-0.5 wt%.
By adopting the technical scheme, 0.3-0.5 wt% of high-thixotropy water-reducing paste is used to prepare the corresponding pervious concrete, and the investment of preparation cost is reduced.
The third purpose of the invention is to provide a method for preparing pervious concrete, which has the advantages of simple construction process and better workability when the pervious concrete is constructed by the preparation method.
In order to achieve the third object, the invention provides the following technical solutions: a preparation method of pervious concrete comprises the following steps;
(1) dissolving the high-thixotropy water-reducing paste material in water according to a proportion, and fully and uniformly mixing to obtain a mixed solution;
(2) adding cement into the mixed solution obtained in the step (1) in proportion, and fully stirring and uniformly mixing;
(3) and (3) adding the stones into the mixture obtained in the step (2) in proportion, and fully stirring and uniformly mixing to obtain the high-thixotropy pervious concrete.
Through adopting above-mentioned technical scheme, through the stirring, promote the homogeneous mixing of each composition of raw and other materials on the one hand, on the other hand, with high thixotropic water reduction cream material dispersion more even, and then guarantee that the pervious concrete conversion rate who makes promotes.
In conclusion, the invention has the following beneficial effects:
firstly, the high-thixotropy water-reducing paste prepared by the invention has good dispersibility and thixotropy, so that when the paste is applied to preparing pervious concrete, the water-cement ratio of the pervious concrete is reduced, the durability of the pervious concrete is improved, and the service life of the pervious concrete is prolonged.
Secondly, the pervious concrete prepared by the high-thixotropy water-reducing paste is preferably adopted, so that the water consumption of the pervious concrete is reduced in the mixing process, the water is saved, meanwhile, the pervious concrete is more diluted when being mixed, so that the pervious concrete has certain thixotropy, and high-thixotropy slurry is formed when the pervious concrete is static, so that the separation and slurry seepage cannot be generated on the stones or other pervious aggregates; then, pervious concrete with better fluidity is formed after stirring, so that the construction rate and the water permeability of the pervious concrete are improved, and the slurry prepared by stirring is easy to transport and construct for a long time.
Thirdly, the pervious concrete preparation method is adopted, the raw materials are uniformly mixed by stirring, the high-thixotropy water-reducing paste is dispersed more uniformly, and the conversion rate of the prepared pervious concrete is improved.
Detailed Description
The present invention will be described in further detail with reference to examples.
In order to solve the problems that a large amount of water is used for preparing the pervious concrete, the water-cement ratio of the pervious concrete is increased, the strength of the prepared pervious concrete is reduced, and the durability of the pervious concrete is low, the invention adopts a method for adding the high-thixotropy water-reducing paste material into raw materials for preparing the pervious concrete.
Example 1: the high thixotropic water-reducing paste material is prepared by mixing the following components in parts by weight:
50kg of liquid melamine water reducing agent, 50kg of liquid polycarboxylic acid water reducing agent, 5kg of gas-phase silicon dioxide, 10kg of silica sol with pH =9, 1kg of sodium alginate, 0.1kg of silane coupling agent and the balance of water, wherein the total mass is 1000 kg;
dissolving gas-phase silicon dioxide, silica sol, sodium alginate and a silane coupling agent in deionized water according to the weight, and uniformly stirring to obtain a clear solution; and mixing the weighed melamine water reducing agent and the weighed polycarboxylic acid water reducing agent, pouring the mixture into the obtained clarified solution, and uniformly stirring to obtain the high-thixotropy water reducing paste.
Example 2: the high thixotropic water-reducing paste material is prepared by mixing the following components in parts by weight:
100kg of liquid melamine water reducing agent, 125kg of liquid polycarboxylic acid water reducing agent, 12.5kg of gas-phase silicon dioxide, 30kg of silica sol with pH =9, 1.5kg of sodium alginate, 0.55kg of silane coupling agent and the balance of water, wherein the total mass is 1000 kg;
dissolving gas-phase silicon dioxide, silica sol, sodium alginate and a silane coupling agent in deionized water according to the weight, and uniformly stirring to obtain a clear solution; and mixing the weighed melamine water reducing agent and the weighed polycarboxylic acid water reducing agent, pouring the mixture into the obtained clarified solution, and uniformly stirring to obtain the high-thixotropy water reducing paste.
Example 3: the high thixotropic water-reducing paste material is prepared by mixing the following components in parts by weight:
150kg of liquid melamine water reducing agent, 200kg of liquid polycarboxylic acid water reducing agent, 20kg of gas-phase silicon dioxide, 50kg of silica sol with pH =9, 2kg of sodium alginate, 1kg of silane coupling agent and the balance of water, wherein the total mass is 1000 kg;
dissolving gas-phase silicon dioxide, silica sol, sodium alginate and a silane coupling agent in deionized water according to the weight, and uniformly stirring to obtain a clear solution; and mixing the weighed melamine water reducing agent and the weighed polycarboxylic acid water reducing agent, pouring the mixture into the obtained clarified solution, and uniformly stirring to obtain the high-thixotropy water reducing paste.
Example 4: the concrete using the high thixotropic water-reducing paste material is prepared by mixing the following components in parts by weight per cubic meter: 350kg of cement, 1202kg of stones with the diameter of 5-10mm and 110kg of water, wherein 5kg of the high thixotropic water reducing paste in the embodiment 1 is selected;
dissolving the high-thixotropy water-reducing paste material in water according to a proportion, and fully and uniformly mixing to obtain a mixed solution; adding the cement into the obtained mixed solution in proportion, and fully stirring and uniformly mixing; and adding the stones into the mixture according to the proportion, and fully stirring and uniformly mixing to obtain the high-thixotropy pervious concrete.
Example 5: the concrete using the high thixotropic water-reducing paste material is prepared by mixing the following components in parts by weight per cubic meter: 350kg of cement, 1202kg of stones with the diameter of 5-10mm and 110kg of water, wherein 5kg of the high thixotropic water reducing paste in the embodiment 2 is selected;
dissolving the high-thixotropy water-reducing paste material in water according to a proportion, and fully and uniformly mixing to obtain a mixed solution; adding the cement into the obtained mixed solution in proportion, and fully stirring and uniformly mixing; and adding the stones into the mixture according to the proportion, and fully stirring and uniformly mixing to obtain the high-thixotropy pervious concrete.
Example 6: the concrete using the high thixotropic water-reducing paste material is prepared by mixing the following components in parts by weight per cubic meter: 350kg of cement, 1202kg of stones with the diameter of 5-10mm and 110kg of water, wherein 5kg of the high thixotropic water reducing paste in the embodiment 3 is selected;
dissolving the high-thixotropy water-reducing paste material in water according to a proportion, and fully and uniformly mixing to obtain a mixed solution; adding the cement into the obtained mixed solution in proportion, and fully stirring and uniformly mixing; and adding the stones into the mixture according to the proportion, and fully stirring and uniformly mixing to obtain the high-thixotropy pervious concrete.
Example 7: the concrete using the high thixotropic water-reducing paste material is prepared by mixing the following components in parts by weight per cubic meter: 400kg of cement, 1347.5kg of stones with the diameter of 5-10mm, 120kg of water, and 7.5kg of high thixotropic water reducing paste selected from the embodiment 2;
dissolving the high-thixotropy water-reducing paste material in water according to a proportion, and fully and uniformly mixing to obtain a mixed solution; adding the cement into the obtained mixed solution in proportion, and fully stirring and uniformly mixing; and adding the stones into the mixture according to the proportion, and fully stirring and uniformly mixing to obtain the high-thixotropy pervious concrete.
Example 8: the concrete using the high thixotropic water-reducing paste material is prepared by mixing the following components in parts by weight per cubic meter: 450kg of cement, 1410kg of stones with the diameter of 5-10mm and 130kg of water, wherein 10kg of the high thixotropic water reducing paste in the embodiment 2 is selected;
dissolving the high-thixotropy water-reducing paste material in water according to a proportion, and fully and uniformly mixing to obtain a mixed solution; adding the cement into the obtained mixed solution in proportion, and fully stirring and uniformly mixing; and adding the stones into the mixture according to the proportion, and fully stirring and uniformly mixing to obtain the high-thixotropy pervious concrete.
Example 9: the concrete using the high thixotropic water-reducing paste material is prepared by mixing the following components in parts by weight per cubic meter: 400kg of cement, 1347.5kg of stones with the diameter of 5-10mm, 120kg of water, and 7.5kg of high thixotropic water-reducing paste selected from the embodiment 3;
dissolving the high-thixotropy water-reducing paste material in water according to a proportion, and fully and uniformly mixing to obtain a mixed solution; adding the cement into the obtained mixed solution in proportion, and fully stirring and uniformly mixing; and adding the stones into the mixture according to the proportion, and fully stirring and uniformly mixing to obtain the high-thixotropy pervious concrete.
Example 10: the concrete using the high thixotropic water-reducing paste material is prepared by mixing the following components in parts by weight per cubic meter: 450kg of cement, 1410kg of stones with the diameter of 5-10mm and 130kg of water, wherein 10kg of the high thixotropic water reducing paste in the embodiment 3 is selected;
dissolving the high-thixotropy water-reducing paste material in water according to a proportion, and fully and uniformly mixing to obtain a mixed solution; adding the cement into the obtained mixed solution in proportion, and fully stirring and uniformly mixing; and adding the stones into the mixture according to the proportion, and fully stirring and uniformly mixing to obtain the high-thixotropy pervious concrete.
Comparative example 1: a polycarboxylic acid water reducing agent is prepared by mixing the following components in parts by weight:
0.2kg of white carbon black, 6kg of sodium carbonate, 6kg of lithium carbonate, 3kg of potassium sulfate, 3kg of aluminum sulfate, 40kg of polycarboxylate superplasticizer mother liquor and 41.8kg of deionized water;
dissolving weighed magnesium carbonate, lithium carbonate, potassium carbonate, zinc sulfate and aluminum sulfate in deionized water according to a proportion,
stirring uniformly and dispersing for 10min by adopting ultrasonic waves to obtain a clear solution; mixing the weighed white carbon black and the mother solution of the polycarboxylate superplasticizer, pouring the mixture into a high-shear mixing emulsifying machine, and stirring for 10min at the rotating speed of 12000 rpm; slowly adding the dispersed clear solution into the polycarboxylate superplasticizer solution, and shearing and stirring at 14000rpm for 5min to obtain the polycarboxylate superplasticizer.
Comparative example 2: the melamine water reducer is prepared by mixing the following components in parts by weight:
19kg of melamine, 38kg of polycyanamine, 20kg of sodium bisulfite, 2kg of 30% sulfuric acid, 3kg of sodium hydroxide solution and 20kg of water;
sequentially adding water, melamine and formaldehyde solution into a reaction kettle provided with a thermometer, a condenser and a stirrer, stirring and heating to 50-60 ℃ for reaction for 1 hour, keeping the temperature at 60-75 ℃ for reaction for 1 hour, and after the hydroxymethylation reaction is finished, adjusting the pH value of the solution to 8.5-9.5 by using sodium hydroxide solution; adding sodium bisulfite into a reaction kettle after hydroxymethylation, heating to 84 ℃, reacting for 1 hour at 84-90 ℃, and maintaining the pH =10-11 of the solution; and (3) when the temperature of the solution is reduced to 50 ℃ after the sulfonation reaction is finished, adjusting the pH value of the system to 5-6.5 by using 30% sulfuric acid, continuing the reaction for 1 hour, and then, neutralizing until the pH value is 7, and discharging to obtain the melamine water reducer.
Comparative example 3: the concrete applied to the comparative example 1 is prepared by mixing the following components in parts by weight per cubic meter: 350kg of cement, 1202kg of stones with the diameter of 5-10mm, 110kg of water and 5kg of polycarboxylic acid water reducing agent;
dissolving a polycarboxylic acid water reducing agent in water according to a proportion, and fully and uniformly mixing to obtain a mixed solution; adding the cement into the obtained mixed solution in proportion, and fully stirring and uniformly mixing; and adding the stones into the mixture according to the proportion, and fully stirring and uniformly mixing to obtain the high-thixotropy pervious concrete.
Comparative example 4: the concrete applied to the comparative example 1 is prepared by mixing the following components in parts by weight per cubic meter: 400kg of cement, 1347.5kg of stones with the diameter of 5-10mm, 120kg of water and 7.5kg of polycarboxylic acid water reducing agent;
dissolving a polycarboxylic acid water reducing agent in water according to a proportion, and fully and uniformly mixing to obtain a mixed solution; adding the cement into the obtained mixed solution in proportion, and fully stirring and uniformly mixing; and adding the stones into the mixture according to the proportion, and fully stirring and uniformly mixing to obtain the high-thixotropy pervious concrete.
Comparative example 5: the concrete applied to the comparative example 1 is prepared by mixing the following components in parts by weight per cubic meter: 450kg of cement, 1410kg of stones with the diameter of 5-10mm, 130kg of water and 10kg of polycarboxylic acid water reducing agent;
dissolving a polycarboxylic acid water reducing agent in water according to a proportion, and fully and uniformly mixing to obtain a mixed solution; adding the cement into the obtained mixed solution in proportion, and fully stirring and uniformly mixing; and adding the stones into the mixture according to the proportion, and fully stirring and uniformly mixing to obtain the high-thixotropy pervious concrete.
Comparative example 6: the concrete applied in the comparative example 2 is prepared by mixing the following components in parts by weight per cubic meter: 350kg of cement, 1202kg of stones with the diameter of 5-10mm, 110kg of water and 5kg of melamine water reduction;
dissolving a melamine water reducing agent in water according to a proportion, and fully and uniformly mixing to obtain a mixed solution; adding the cement into the obtained mixed solution in proportion, and fully stirring and uniformly mixing; and adding the stones into the mixture according to the proportion, and fully stirring and uniformly mixing to obtain the high-thixotropy pervious concrete.
Comparative example 7: the concrete applied in the comparative example 2 is prepared by mixing the following components in parts by weight per cubic meter: 400kg of cement, 1347.5kg of stones with the diameter of 5-10mm, 120kg of water and 7.5kg of melamine water reducing agent;
dissolving a melamine water reducing agent in water according to a proportion, and fully and uniformly mixing to obtain a mixed solution; adding the cement into the obtained mixed solution in proportion, and fully stirring and uniformly mixing; and adding the stones into the mixture according to the proportion, and fully stirring and uniformly mixing to obtain the high-thixotropy pervious concrete.
Comparative example 8: the concrete applied in the comparative example 2 is prepared by mixing the following components in parts by weight per cubic meter: 450kg of cement, 1410kg of stones with the diameter of 5-10mm, 130kg of water and 10kg of melamine water reducing agent;
dissolving a melamine water reducing agent in water according to a proportion, and fully and uniformly mixing to obtain a mixed solution; adding the cement into the obtained mixed solution in proportion, and fully stirring and uniformly mixing; and adding the stones into the mixture according to the proportion, and fully stirring and uniformly mixing to obtain the high-thixotropy pervious concrete.
In the above examples and comparative examples, the alkaline silica sol was obtained from Nicotine Henxin chemical technology, Inc., under the brand name Henxin brand, THIS-S30; fumed silica, available from shanghai ding chemical technology ltd; the liquid melamine water reducing agent is purchased from Shanghai Lujia chemical industry Co., Ltd, the brand is Lujia chemical industry, and the model is VF-8; the liquid polycarboxylate superplasticizer is purchased from novel Henan Tourden building materials GmbH; sodium alginate, purchased from bio-technology development ltd, forest of Qingdao sea; the silane coupling agent is purchased from Nanjing Quanxi chemical company Limited, and has the model of A-186 and the brand of Quanxi; the stone is 5-10 mm; the cement is P.042.5R cement; the water is tap water.
In order to evaluate the effect of the invention on improving the workability in pervious concrete, after 28d of curing, the compressive strength and the permeability coefficient of pervious concrete prepared by adding 0.3wt%, 0.4wt% and 0.5wt% of high thixotropic water reducing paste and a conventional water reducing agent are respectively tested. The specific operation is as follows:
preparation: the pervious concrete is prepared according to the pervious concrete mixing proportion specified in CJJ/T135 technical Specification for pervious concrete pavements, southern P.042.5R cement is selected and used in an amount of 400kg/m3The aggregate is stone of 5-10mm, and the dosage is 1000kg/m3The water consumption is 120kg/m3。
Forming and maintaining: respectively pouring and molding a 150mm multiplied by 150mm cubic test piece by pervious concrete prepared by adding 0.3wt%, 0.4wt% and 0.5wt% of high thixotropic water reducing paste and a conventional water reducing agent, curing with a mold for 1d, removing the mold, and performing standard curing to 28 d.
Testing the performance of the pervious concrete: the 28d compressive strength of the pervious concrete is tested according to GB50081 standard of test method for mechanical properties of common concrete, and the water permeability coefficient of the pervious concrete is tested according to CJJ/T135 technical specification of pervious concrete pavement.
Testing the construction effectiveness of the pervious concrete: according to the basic requirements of GB50204-2015 'specification for acceptance of construction quality of concrete structure engineering', the following table evaluations are carried out:
example 4-10 application of the pervious concrete prepared
Table 2 example performance comparison
From the test results of table 2 above, the following conclusions can be drawn:
1. from the comparison of examples 4 to 6, it can be known that the weight ratio and the water-cement ratio of the high-thixotropy water-reducing paste are the same, and the higher the amount of the added high-thixotropy water-reducing paste is, the better the strength is, and the better the construction effect is;
2. from examples 5, 7 and 8 and comparison with comparative examples 3 and 6, it can be seen that when the weight ratio and the water-cement ratio of the high-thixotropy water-reducing paste are the same, the higher the amount of the high-thixotropy water-reducing paste is added, the better the strength is, and the better the construction effect is;
3. from the comparison of examples 7, 9 and 10, it can be seen that when the weight ratio and the doping amount of the high thixotropic water reducing paste are the same, the smaller the water-cement ratio is added, the better the strength change is, and the construction effect is better;
4. from the comparison between examples 4-10 and comparative examples 3-8, it can be seen that the addition of the highly thixotropic water-reducing paste has a better compressive strength effect on pervious concrete than the addition of the melamine water-reducing agent and the polycarboxylic acid water-reducing agent.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (8)
1. The high-thixotropy water-reducing paste is characterized by comprising the following components in percentage by weight:
10-35% of water reducing agent, 0.5-2.0% of gas-phase silicon dioxide, 1.0-5.0% of silica sol, 0.1-0.2% of inorganic stabilizer, 0.01-0.1% of coupling agent and the balance of water.
2. The highly thixotropic water-reducing paste according to claim 1, wherein the water-reducing agent comprises a melamine water-reducing agent and a polycarboxylic acid water-reducing agent, the melamine water-reducing agent accounts for 5-15% of the total weight of the highly thixotropic water-reducing paste, and the polycarboxylic acid water-reducing agent accounts for 5-20% of the total weight of the highly thixotropic water-reducing paste.
3. The highly thixotropic water reducing paste according to claim 1 or 2, wherein the water reducing agents are all liquids.
4. The highly thixotropic water-reducing paste of claim 1, wherein the silica sol is an alkaline silica sol and the pH is from 8 to 10.
5. The highly thixotropic water-reducing paste according to claim 1, wherein the inorganic stabilizer is sodium alginate.
6. The pervious concrete to which the highly thixotropic water-reducing paste material of any one of claims 1 to 5 is applied, characterized in that the pervious concrete comprises the following components in parts by weight: 450 parts of cement 350-.
7. The pervious concrete of highly thixotropic water-reducing paste according to claim 6, wherein the highly thixotropic water-reducing paste is incorporated in the pervious concrete in an amount of 0.3 to 0.5% by weight.
8. The method for preparing concrete of the highly thixotropic water-reducing paste according to claim 7, which comprises the steps of: (1) dissolving the high-thixotropy water-reducing paste material in water according to a proportion, and fully and uniformly mixing to obtain a mixed solution; (2) adding cement into the mixed solution obtained in the step (1) in proportion, and fully stirring and uniformly mixing; (3) and (3) adding the stones into the mixture obtained in the step (2) in proportion, and fully stirring and uniformly mixing to obtain the high-thixotropy pervious concrete.
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