CN108911567B - Special additive for high-strength concrete and preparation method thereof - Google Patents
Special additive for high-strength concrete and preparation method thereof Download PDFInfo
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- CN108911567B CN108911567B CN201810824464.2A CN201810824464A CN108911567B CN 108911567 B CN108911567 B CN 108911567B CN 201810824464 A CN201810824464 A CN 201810824464A CN 108911567 B CN108911567 B CN 108911567B
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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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Abstract
The invention discloses a special additive for high-strength concrete and a preparation method thereof, wherein the special additive for high-strength concrete comprises the following components in parts by weight: 190 and 220 parts of water reducing agent; 120 portions of slump retaining agent and 160 portions of slump retaining agent; 20-30 parts of sodium gluconate; 0.5-1.5 parts of hydroxypropyl cellulose; 3-5.8 parts of a thickening agent; 1-2.5 parts of an air entraining agent; 0.2-0.8 part of defoaming agent; 10-26 parts of sodium nitrite; 619.3-631.4 parts of water; the water reducing agent comprises at least one of a polycarboxylic acid high-efficiency water reducing agent and a hyperbranched modified polycarboxylic acid water reducing agent; the thickener comprises at least one of polyacrylamide and sodium polyacrylate. The invention has the advantages of improving the compressive strength of concrete and stably maintaining the compressive strength of the concrete.
Description
Technical Field
The invention relates to the technical field of additives, in particular to a special additive for high-strength concrete and a preparation method thereof.
Background
The concrete has various types including recycled concrete, lightweight aggregate concrete and the like, and needs higher compressive strength and can bear higher deformation resistance for high-rise building structures, large-span bridge structures and certain special structures, so that the concrete has higher requirements on the proportion of components in the concrete, and meanwhile, the added admixture has an inseparable relationship with respect to the compressive strength of the concrete. Therefore, an admixture for improving and stably maintaining the compressive strength of concrete has a high commercial value.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the special admixture for the high-strength concrete, which has the advantages of improving the compressive strength of the concrete and stably maintaining the compressive strength.
In order to achieve the first purpose, the invention provides the following technical scheme:
the special additive for the high-strength concrete comprises the following components in parts by weight:
190 and 220 parts of water reducing agent;
120 portions of slump retaining agent and 160 portions of slump retaining agent;
20-30 parts of sodium gluconate;
0.5-1.5 parts of hydroxypropyl cellulose;
3-5.8 parts of a thickening agent;
1-2.5 parts of an air entraining agent;
0.2-0.8 part of defoaming agent;
10-26 parts of sodium nitrite;
619.3-631.4 parts of water;
the water reducing agent comprises at least one of a polycarboxylic acid high-efficiency water reducing agent and a hyperbranched modified polycarboxylic acid water reducing agent; the thickening agent comprises at least one of polyacrylamide and sodium polyacrylate.
Through the technical scheme, the polycarboxylic acid high-efficiency water reducing agent and the hyperbranched modified polycarboxylic acid water reducing agent have good slump retention rate at low temperature, the air temperature exceeds 20 ℃, the 1h slump is slightly lost, but the air temperature is kept above 95%, the air temperature exceeds 30 ℃, and the 1h slump retention value is still 93%. Among the thickeners, polyacrylamide and sodium polyacrylate have good and stable thickening effect. The sodium gluconate helps a liquid phase system of the admixture to keep a stable state under the combined action of the sodium gluconate, the water reducing agent, the thickening agent and the hydroxypropyl cellulose, and after the sodium gluconate is mixed with a concrete mixture, the concrete can have smaller slump loss in different temperature ranges, and longer construction time is ensured.
More preferably: the special admixture for the high-strength concrete comprises the following components in parts by weight:
190 portions of water reducing agent and 200 portions of water reducing agent;
120 portions of slump retaining agent and 150 portions of slump retaining agent;
20-25 parts of sodium gluconate;
0.5-1 part of hydroxypropyl cellulose;
3-5 parts of a thickening agent;
1-1.5 parts of an air entraining agent;
0.2-0.5 part of defoaming agent;
10-20 parts of sodium nitrite;
619.3-619.9 parts of water.
More preferably: the special admixture for the high-strength concrete further comprises 1-8 parts by weight of colloidal microcrystalline cellulose, and the solid content of microcrystalline cellulose in the colloidal microcrystalline cellulose is 5-6%.
More preferably: also comprises 3 to 10 parts of glycerol by weight.
By the technical scheme, the colloidal microcrystalline cellulose has uniform stability, is matched with sodium nitrite and a water reducing agent, so that the microcrystalline cellulose in the colloid is swollen, the pores in the colloid are opened, and the microcrystalline cellulose has a large specific surface area, so that the microcrystalline cellulose is in more sufficient contact with components such as sodium gluconate and hydroxypropyl cellulose and is uniformly dispersed in a whole liquid phase system; simultaneously, the glycerol has the functions of dispersing and protecting the microcrystalline cellulose, can be uniformly attached to the surface of the microcrystalline cellulose, and promotes the microcrystalline cellulose to be fully dispersed in a liquid phase system of the additive in the formed additive; and the glycerol has a good dilute moisture absorption effect. After the special admixture of high-strength concrete mixes with concrete mixture in this application, help improving the water retaining effect of concrete mixture to make wherein except that the component of admixture under the effect of water retaining, can with the water-reducing agent, reach abundant being connected, and then improve the compressive strength of the concrete after the sclerosis.
More preferably: the slump retaining agent is a polycarboxylic acid slump retaining agent.
Through the technical scheme, the polycarboxylic acid slump retaining agent can improve the cohesiveness of the concrete mixture, improve the segregation resistance and bleeding resistance of the concrete mixture, and enable the concrete mixture to obtain better slump.
More preferably: the air entraining agent comprises at least one of alkyl sulfonate air entraining agents, saponin compound air entraining agents and modified rosin thermopolymer air entraining agents.
By adopting the technical scheme, the alkyl sulfonate air entraining agent, the saponin compound air entraining agent and the modified rosin thermopolymer air entraining agent can improve the workability, the water retention property and the cohesiveness of the concrete mixture and improve the fluidity of the concrete.
More preferably: the defoaming agent comprises at least one of polyether modified silicon defoaming agent and organic silicon defoaming agent.
Through the technical scheme, the polyether modified silicon defoaming agent and the organic silicon defoaming agent can inhibit the generation of bubbles and even eliminate the bubbles in the process of forming the admixture and the stirring process of the concrete mixture, and the connecting effect between the admixture and the concrete mixture is improved, so that the compressive strength of the hardened concrete is improved.
The second purpose of the invention is to provide a preparation method of the special additive for the high-strength concrete.
In order to achieve the second purpose, the invention provides the following technical scheme:
a preparation method of the special additive for the high-strength concrete comprises the following steps:
s1, fully mixing water reducing agent, slump retaining agent, sodium gluconate, hydroxypropyl cellulose, air entraining agent, defoaming agent, sodium nitrite and water in corresponding parts by weight to form a mixture;
s2, fully mixing the thickening agent with the mixture obtained in the step S1 in corresponding weight portion to obtain the special admixture for the high-strength concrete.
By adopting the technical scheme, when the water reducing agent, the slump retaining agent, the sodium gluconate, the hydroxypropyl cellulose, the air entraining agent, the defoaming agent, the sodium nitrite and the water are mixed in the step S1, the water reducing agent, the slump retaining agent, the sodium gluconate, the hydroxypropyl cellulose, the air entraining agent, the defoaming agent, the sodium nitrite and the water are mixed uniformly, so that the production cost is reduced; the added thickening agent in the step S2 increases the overall viscosity of the mixture system, is beneficial to improving the uniformity of mixing in turn, and reduces the energy consumption in the whole production process of the admixture to a certain extent so as to save the production cost.
More preferably: and step S1, adding corresponding parts by weight of colloidal microcrystalline cellulose and glycerol.
Through the technical scheme, the colloid microcrystalline cellulose and the glycerol are added in the step S1, so that the pores in the microcrystalline cellulose are opened, and the microcrystalline cellulose is easily uniformly dispersed in a liquid phase environment which is easy to mix uniformly and under the action of the glycerol, and a good integral dispersing effect is achieved.
In conclusion, the invention has the following beneficial effects:
1. under the combined action of the sodium gluconate, the water reducing agent, the thickening agent and the hydroxypropyl cellulose, a formed liquid phase system of the admixture is kept in a relatively stable state, and after the sodium gluconate is mixed with a concrete mixture, the compressive strength of the hardened concrete is improved and stably kept;
2. the microcrystalline cellulose, the sodium nitrite, the water reducing agent, the thickening agent, the sodium gluconate, the hydroxypropyl cellulose and the glycerol form a compound effect, and the compressive strength of the hardened concrete is further improved and stably maintained.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1: the admixture special for the high-strength concrete comprises the components and the corresponding parts by weight shown in table 1, and is prepared by the following steps:
s1, fully mixing a polycarboxylic acid high-efficiency water reducing agent, a slump retaining agent, sodium gluconate, hydroxypropyl cellulose, an air entraining agent, a defoaming agent, sodium nitrite, water, microcrystalline cellulose and glycerol to form a mixture;
s2, fully mixing the thickening agent with the mixture obtained in the step S1 to obtain the special additive for the high-strength concrete.
Wherein the thickening agent is sodium polyacrylate; the slump retaining agent is a polycarboxylic slump retaining agent; the air entraining agent is alkyl sulfonate air entraining agent, saponin composite air entraining agent and modified rosin thermopolymer air entraining agent in the weight ratio of 1 to 1; the defoaming agent is an organic silicon defoaming agent; the solid content of microcrystalline cellulose in the colloidal microcrystalline cellulose was 6%.
Examples 2 to 6: the admixture special for high-strength concrete is different from the admixture of example 1 in that the components and corresponding parts by weight are shown in table 1, and the solid content of microcrystalline cellulose in the colloidal microcrystalline cellulose is 5%.
Table 1 examples 1-6 include the components and their respective parts by weight
Example 7: the additive special for the high-strength concrete is different from the additive of the embodiment 1 in that the water reducing agent is a hyperbranched modified polycarboxylic acid water reducing agent.
Example 8: the additive special for the high-strength concrete is different from the additive in the embodiment 1 in that the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent and a hyperbranched modified polycarboxylic acid water reducing agent with the weight part ratio of 1.5: 1.
Example 9: the special additive for high-strength concrete is different from the additive in example 1 in that the thickening agent is polyacrylamide.
Example 10: the special additive for high-strength concrete is different from the additive in example 1 in that the thickening agent is polyacrylamide and sodium polyacrylate with the weight part ratio of 1.2: 1.
Example 11: the additive special for the high-strength concrete is different from the additive of example 1 in that the air-entraining agent is an alkyl sulfonate air-entraining agent.
Example 12: compared with the additive in the embodiment 1, the additive specially used for the high-strength concrete is characterized in that the air-entraining agent is a saponin compound air-entraining agent and a modified rosin thermopolymer air-entraining agent in a weight ratio of 1: 2.
Example 13: compared with the additive in the embodiment 1, the additive specially used for the high-strength concrete is characterized in that in the air entraining agent, the weight part ratio of alkyl sulfonate air entraining agent, saponin compound air entraining agent and modified rosin thermopolymer air entraining agent is 1: 0.5: 1.
Example 14: the special additive for high-strength concrete is different from the additive in example 1 in that the defoaming agent comprises a polyether modified silicon defoaming agent.
Example 15: the special additive for high-strength concrete is different from the additive in example 1 in that the defoaming agent is a polyether modified silicon defoaming agent and an organic silicon defoaming agent with the weight portion ratio of 1: 1.
Example 16: the special additive for high-strength concrete is different from the additive in example 1 in that the additive does not contain microcrystalline cellulose and glycerol.
Example 17: the special additive for high-strength concrete is different from the additive in example 1 in that the additive does not contain microcrystalline cellulose.
Example 18: the admixture for high-strength concrete is different from the admixture of example 1 in that it does not contain the tetratriol.
Comparative example 1: an admixture differs from example 1 in that the water-reducing agent is a polycarboxylic acid water-reducing agent, and the weight part of the polycarboxylic acid water-reducing agent is 160 parts.
Comparative example 2: an additive, which is different from comparative example 1 in that the thickener is polyether urethane and the weight part of the thickener is 30 parts.
Comparative example 3: an admixture differing from comparative example 2 in that sodium gluconate and hydroxypropylcellulose were not contained.
Comparative example 4: an additive is different from the additive in example 1 in that a water reducing agent, a slump retaining agent, sodium gluconate, hydroxypropyl cellulose, a thickening agent, an air entraining agent, a defoaming agent, sodium nitrite and water are mixed for 0.5h, then colloidal microcrystalline cellulose and glycerol are added, and the mixture is mixed for 0.5 h.
Test one: test for compressive Strength
The test method comprises the following steps:
1. preparation of test samples: 8.0kg of the corresponding admixture in examples 1 to 18, which was obtained by using P.O 62.5.5 cement 0.444t and S105 mineral powder 0.056t, was added, 0.792t of medium sand, 1.008t of stones with a particle size of less than 31.5mm and 0.13t of water were added, and a 150mm × 150mm × 150mm concrete sample was molded, and the concrete sample was allowed to stand at a temperature of 20 + -5 ℃ for one day, then demolded, and placed in a standard curing room at a temperature of 20 + -2 ℃ and a humidity of 95% or more, thereby obtaining test samples 1 to 18.
2. Preparation of control sample: P.O 62.5.5 cement 0.444t and S105 mineral powder 0.056t were used to prepare 8.0Kg of the admixture of comparative examples 1-4, 0.792t of medium sand and 1.008t of stones with a particle size of less than 31.5mm were added, and 0.13t of water was added, and the curing method was the same as that of the test samples, to obtain comparative samples 1-4.
3. The test samples 1 to 18 and the control samples 1 to 4 were tested for their compressive strength on day 3, day 7 and day 28, respectively, according to GB 50107-2010.
And (3) test results: the compressive strengths of the test samples 1-18 and the control samples 1-4 are shown in Table 2.
TABLE 2 compressive Strength of test samples 1-18, control samples 1-4
As can be seen from Table 2, the changes in compressive strength after days 3, 7 and 28 of the test samples 1 to 18 are more significant than the changes in compressive strength after days 3, 7 and 28 of the control samples 1 to 4, and although the compressive strength of the control sample 4 is more prominent in the control samples 1 to 4, the changes are still lower than the compressive strengths of the test samples 1 to 18. The above situation is illustrated: under the combined action of the colloidal microcrystalline cellulose, the glycerol, the sodium gluconate, the water reducing agent, the thickening agent and the hydroxypropyl cellulose, a liquid phase system of the formed admixture is kept in a relatively stable state, and the compressive strength of the hardened concrete is improved after the admixture is mixed with the concrete mixture. Meanwhile, the preparation method of the admixture has great influence on the whole mixing uniformity of the admixture, and has great influence on the mixing uniformity and the compressive strength of concrete when the admixture is added into a concrete mixture.
Meanwhile, the compressive strength changes of the test samples 1-15 after days 3, 7 and 28 are better than the compressive strength changes of the test samples 16-18 after days 3, 7 and 28, which shows that the colloid microcrystalline cellulose, the sodium nitrite, the water reducing agent, the thickening agent, the sodium gluconate, the hydroxypropyl cellulose and the glycerol form a compound action, and the combined action of the colloid microcrystalline cellulose, the sodium nitrite, the water reducing agent, the thickening agent and the hydroxypropyl cellulose is more favorable for improving the compressive strength of the hardened concrete than the combined action of the sodium gluconate, the water reducing agent, the thickening agent and the hydroxypropyl cellulose.
And (2) test II: aging resistance test
Respectively preparing test samples 1-18 and control samples 1-4 according to the mode in the first test, respectively placing the test samples 1-18 and the control samples 1-4 into a QUV ultraviolet light aging acceleration testing machine, aging for 3 months, respectively taking out the test samples 1-18 and the control samples 1-4 after aging, and detecting the compressive strength according to GB 50107-2010.
And (3) test results: the compressive strengths of the test samples 1-18 and the control samples 1-4 after aging treatment are shown in Table 3.
TABLE 3 compressive Strength of test samples 1-18 and control samples 1-4 after aging treatment
| Sample (I) | Compressive strength after aging treatment (Mpa) |
| Test sample 1 | 89.6 |
| Test sample 2 | 89.3 |
| Test sample 3 | 89.3 |
| Test sample 4 | 89.2 |
| Test sample 5 | 85.3 |
| Test sample 6 | 85.1 |
| Test sample 7 | 85.9 |
| Test sample 8 | 90.1 |
| Test sample 9 | 88.9 |
| Test sample 10 | 90.2 |
| Test sample 11 | 88.3 |
| Test sample 12 | 89.5 |
| Test sample 13 | 90.3 |
| Test sample 14 | 88.6 |
| Test sample 15 | 90.2 |
| Test sample 16 | 76.3 |
| Test sample 17 | 76.9 |
| Test sample 18 | 80.3 |
| Control sample 1 | 45.2 |
| Control sample 2 | 45.3 |
| Control sample 3 | 46.5 |
| Control sample 4 | 51.3 |
As can be seen from Table 3, the compressive strengths of the test samples 1-18 are all greater than the compressive strengths of the control samples 1-4 after aging treatment, which indicates that the stability of the compressive strengths of the test samples 1-18 is better than that of the control samples 1-4, and the reasons for this difference are mainly: the combined action of the colloidal microcrystalline cellulose, the sodium nitrite, the water reducing agent, the thickening agent, the sodium gluconate, the hydroxypropyl cellulose and the glycerol is beneficial to ensuring the compressive strength of the hardened high-definition concrete.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (5)
1. The admixture special for the high-strength concrete is characterized by comprising the following components in parts by weight:
190 and 220 parts of water reducing agent;
120 portions of slump retaining agent and 160 portions of slump retaining agent;
20-30 parts of sodium gluconate;
0.5-1.5 parts of hydroxypropyl cellulose;
3-5.8 parts of a thickening agent;
1-2.5 parts of an air entraining agent;
0.2-0.8 part of defoaming agent;
10-26 parts of sodium nitrite;
619.3-631.4 parts of water;
1-8 parts of colloidal microcrystalline cellulose;
3-10 parts of glycerol;
the solid content of microcrystalline cellulose in the colloidal microcrystalline cellulose is 5-6%;
the water reducing agent comprises at least one of a polycarboxylic acid high-efficiency water reducing agent and a hyperbranched modified polycarboxylic acid water reducing agent;
the thickening agent comprises at least one of polyacrylamide and sodium polyacrylate;
the preparation method of the special additive for the high-strength concrete comprises the following steps:
s1, fully mixing water reducing agent, slump retaining agent, sodium gluconate, hydroxypropyl cellulose, air entraining agent, defoaming agent, sodium nitrite, water, colloidal microcrystalline cellulose and glycerol in parts by weight to form a mixture;
s2, fully mixing the thickening agent with the mixture obtained in the step S1 in corresponding weight portion to obtain the special admixture for the high-strength concrete.
2. The admixture special for high-strength concrete according to claim 1, which is characterized by comprising the following components in parts by weight:
190 portions of water reducing agent and 200 portions of water reducing agent;
120 portions of slump retaining agent and 150 portions of slump retaining agent;
20-25 parts of sodium gluconate;
0.5-1 part of hydroxypropyl cellulose;
3-5 parts of a thickening agent;
1-1.5 parts of an air entraining agent;
0.2-0.5 part of defoaming agent;
10-20 parts of sodium nitrite;
619.3-619.9 parts of water.
3. The admixture special for high-strength concrete according to claim 1 or 2, wherein the slump retaining agent is a polycarboxylic acid slump retaining agent.
4. The admixture special for high-strength concrete according to claim 1 or 2, wherein the air-entraining agent comprises at least one of alkyl sulfonate type air-entraining agent, saponin type composite air-entraining agent and modified rosin thermopolymer type air-entraining agent.
5. The admixture special for high-strength concrete according to claim 1 or 2, wherein the defoaming agent comprises at least one of polyether modified silicon defoaming agent and silicone defoaming agent.
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| CN111268938A (en) * | 2018-12-05 | 2020-06-12 | 扬州携砼新材料科技有限公司 | Concrete anti-cracking waterproof powder additive and preparation method thereof |
| CN110698109A (en) * | 2019-09-24 | 2020-01-17 | 上海建工材料工程有限公司 | Special high-workability bleeding-resistant additive for nanoscale concrete |
| CN111056763A (en) * | 2019-12-30 | 2020-04-24 | 广西北海市圣峰建材科技有限公司 | Preparation method of high-molecular anti-crack and anti-permeability mortar modifier |
| CN113735484A (en) * | 2021-08-28 | 2021-12-03 | 重庆石博士新材料有限公司 | Additive, machine-made sand fair-faced concrete and preparation method and device thereof |
| CN113816650A (en) * | 2021-10-13 | 2021-12-21 | 湖北鸿宸新材料科技有限公司 | Concrete additive processing method capable of enhancing concrete strength |
| CN114105518A (en) * | 2021-12-22 | 2022-03-01 | 中铁十局集团第二工程有限公司 | Concrete additive |
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