阅读说明：本技术 一种早强增强型复合泡沫混凝土发泡剂 (Early-strength enhanced composite foam concrete foaming agent ) 是由 汪建斌 韩健 于 2020-12-29 设计创作，主要内容包括：本发明公开了一种早强增强型复合泡沫混凝土发泡剂及其制备方法,其制备原料,按质量百分比计,包括发泡组分25～50％,稳泡剂10～20％,早强剂1～5％,增强纤维1～5％,增稠剂0.5～1.5％,水20～55％。发泡剂具很好的发泡能力和发泡稳定性,在泡沫混凝土内部形成的泡孔大小均一、分布均匀,能够提高混凝土早期强度,发泡剂中不含氯盐,降低了对钢筋混凝土,以及有金属预埋件的混凝土的影响。(The invention discloses an early strength enhanced composite foam concrete foaming agent and a preparation method thereof, and the preparation raw materials comprise, by mass, 25-50% of a foaming component, 10-20% of a foam stabilizer, 1-5% of an early strength agent, 1-5% of a reinforcing fiber, 0.5-1.5% of a thickening agent and 20-55% of water. The foaming agent has good foaming capacity and foaming stability, the size of the foam holes formed in the foam concrete is uniform and the foam holes are uniformly distributed, the early strength of the concrete can be improved, and the foaming agent does not contain chloride salt, so that the influence on the reinforced concrete and the concrete with metal embedded parts is reduced.)

1. The early-strength enhanced composite foam concrete foaming agent is characterized in that: the foaming agent comprises, by mass, 25-50% of a foaming component, 10-20% of a foam stabilizer, 1-5% of an early strength agent, 1-5% of a reinforcing fiber, 0.5-1.5% of a thickening agent and 20-55% of water.

2. The early strength reinforced composite foam concrete foaming agent according to claim 1, wherein: the foaming component includes an anionic surfactant and a vegetable protein.

3. The early strength reinforced composite foam concrete foaming agent according to claim 2, wherein: the anionic surfactant is selected from: any one or mixture of several of sodium dodecyl glycinate, sodium dodecyl sarcosinate, sodium dodecyl sulfate, sodium lauroyl glutamate, sodium lauroyl sarcosinate, sodium cocoyl glutamate, sodium cocoyl sarcosinate and sodium cocoyl glycinate.

4. The early strength reinforced composite foam concrete foaming agent according to claim 3, wherein: the weight ratio of the anionic surfactant to the vegetable protein is (0.5-0.8): 1.

5. the early strength reinforced composite foam concrete foaming agent according to claim 4, wherein: the vegetable protein comprises saponin vegetable protein and tea saponin vegetable protein, and the weight ratio is (0.5-1.5): 1.

6. the early strength reinforced composite foam concrete foaming agent according to claim 1, wherein: the foam stabilizer is any one or a mixture of more of fatty alcohol-polyoxyethylene ether sodium sulfate, alpha-alkenyl sodium sulfonate and dodecyl dimethyl amine oxide.

7. The early strength reinforced composite foam concrete foaming agent according to claim 1, wherein: the early strength agent is the mixture of triisopropanolamine and sodium nitrite.

8. The early strength reinforced composite foam concrete foaming agent according to claim 7, wherein: the weight ratio of the triisopropanolamine to the sodium nitrite is (8-12): 1.

9. the early strength reinforced composite foam concrete foaming agent according to claim 1, wherein: the reinforced fiber is polypropylene fiber with tensile strength greater than 500 MPa.

10. The early strength reinforced composite foam concrete foaming agent according to claim 9, wherein: the diameter of the polypropylene fiber is 15-50 mu m, and the length of the polypropylene fiber is 8-15 mm.

Technical Field

The invention belongs to the field of foaming agents, and particularly relates to an early-strength enhanced composite foam concrete foaming agent.

Background

The foam concrete has low density, and the self weight of the building can be reduced by about 25 percent by adopting the material in building structures such as inner and outer walls, layers, floors, columns and the like of the building; for structural members, if foamed concrete is adopted to replace common concrete, the bearing capacity of the structural members can be improved; the foamed concrete contains a large amount of closed fine pores, so that the foamed concrete has good thermal performance, namely good heat insulation performance, which is not possessed by common concrete.

The foam concrete needs a certain period from pouring to curing to required strength, the construction progress is slowed to a certain extent, and the construction efficiency is reduced. In order to improve the early strength, shorten the maintenance time and accelerate the construction progress so as to improve the construction efficiency. Particularly, the perennial winter period in the northeast, northwest and northwest areas is longer, and the early strength of concrete needs to be improved in the construction that the air temperature is reduced to below 10 ℃ in winter in the east and south areas, so the early strength enhanced foam concrete foaming agent is particularly necessary. The addition of the chloride salt into the foaming agent can improve the early strength of the concrete, but the addition of the Cl ions can generate adverse effects on the reinforced concrete and the concrete with metal embedded parts, and has potential harm to the performance and the long-term stability of the concrete. In addition, the foaming agent with a single surfactant component has a single function and cannot completely meet the actual production requirement of the foam concrete.

Disclosure of Invention

In order to solve the problems, the invention provides an early-strength enhanced composite foam concrete foaming agent which comprises, by mass, 25-50% of a foaming component, 10-20% of a foam stabilizer, 1-5% of an early-strength agent, 1-5% of a reinforcing fiber, 0.5-1.5% of a thickening agent and 20-55% of water.

As a preferred embodiment, the foaming component comprises an anionic surfactant and a vegetable protein.

As a preferred embodiment, the anionic surfactant is selected from: any one or mixture of several of sodium dodecyl glycinate, sodium dodecyl sarcosinate, sodium dodecyl sulfate, sodium lauroyl glutamate, sodium lauroyl sarcosinate, sodium cocoyl glutamate, sodium cocoyl sarcosinate and sodium cocoyl glycinate.

As a preferable technical scheme, the weight ratio of the anionic surfactant to the vegetable protein is (0.5-0.8): 1.

as a preferable technical scheme, the vegetable protein comprises saponin vegetable protein and tea saponin vegetable protein, and the weight ratio is (0.5-1.5): 1.

as a preferable technical scheme, the foam stabilizer is any one or a mixture of more of fatty alcohol-polyoxyethylene ether sodium sulfate, alpha-alkenyl sodium sulfonate and dodecyl dimethyl amine oxide.

As a preferable technical scheme, the early strength agent is a mixture of triisopropanolamine and sodium nitrite.

As a preferable technical scheme, the weight ratio of triisopropanolamine to sodium nitrite is (8-12): 1.

as a preferred technical scheme, the reinforced fiber is polypropylene fiber, and the tensile strength is more than 500 MPa.

As a preferable technical scheme, the diameter of the polypropylene fiber is 15-50 mu m, and the length of the polypropylene fiber is 9-12 mm.

Has the advantages that:

1. the compounding of the anionic surfactant and the vegetable protein can improve the foaming times and shorten the foaming time on one hand, and can improve the stability of the liquid film on the other hand. .

2. The foam stabilizer is dodecyl dimethyl amine oxide, and can reduce the repulsive force of anionic groups of the liquid membrane anionic surfactant, thereby realizing foam stabilization. And the foam material can be combined with vegetable protein, so that the opening rate of bubbles is reduced, and the communication rate among foams is reduced, thereby ensuring that the air holes are distributed more uniformly.

3. The early strength agent is the mixture of triisopropanolamine and sodium nitrite, so that the early strength development rate of the foam concrete can be greatly improved, and the early strength of the foam concrete is improved; but also can promote the surface of the steel bar to form a compact protective film.

4. The tensile strength of the polypropylene fiber is more than 500Mpa, and the strength of the foam concrete can be improved.

5. The diameter of the polypropylene fiber is 15-50 mu m, the length of the polypropylene fiber is 8-15 mm, and air holes formed in the foam concrete have better stability, so that the impact resistance and the toughness of the foam concrete are further improved. .

Detailed Description

The invention will be further understood by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. To the extent that a definition of a particular term disclosed in the prior art is inconsistent with any definition provided in the present disclosure, the definition of the term provided in the present disclosure controls.

As used herein, a feature that does not define a singular or plural form is also intended to include a plural form of the feature unless the context clearly indicates otherwise. It will be further understood that the term "prepared from …," as used herein, is synonymous with "comprising," including, "comprising," "having," "including," and/or "containing," when used in this specification means that the recited composition, step, method, article, or device is present, but does not preclude the presence or addition of one or more other compositions, steps, methods, articles, or devices. Furthermore, the use of "preferred," "preferably," "more preferred," etc., when describing embodiments of the present invention, is meant to refer to embodiments of the invention that may provide certain benefits, under certain circumstances. However, other embodiments may be preferred, under the same or other circumstances. In addition, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.

In order to solve the problems, the invention provides an early-strength enhanced composite foam concrete foaming agent which comprises, by mass, 25-50% of a foaming component, 10-20% of a foam stabilizer, 1-5% of an early-strength agent, 1-5% of a reinforcing fiber, 0.5-1.5% of a thickening agent and 20-55% of water.

The anionic surfactant has better foaming capacity, but the liquid film wall is thin and unstable; the vegetable protein has no corrosivity to cement and metal, no pollution to environment, but poor foaming effect. In some preferred embodiments, the foaming component is a mixture of an anionic surfactant and a vegetable protein, which not only can exert their advantages, but also can diminish their respective disadvantages by synergistic action.

The anionic surfactant is selected from: any one or mixture of several of sodium dodecyl glycinate, sodium dodecyl sarcosinate, sodium dodecyl sulfate, sodium lauroyl glutamate, sodium lauroyl sarcosinate, sodium cocoyl glutamate, sodium cocoyl sarcosinate and sodium cocoyl glycinate.

The plant protein is selected from: saponin plant protein and tea saponin plant protein or their mixture.

In some preferred embodiments, the weight ratio of anionic surfactant to vegetable protein is (0.5-0.8): 1, on one hand, the foaming times can be improved and the foaming time can be shortened, and on the other hand, the liquid film stability can be improved. In some more preferred embodiments, the vegetable protein is selected from a mixture of saponin vegetable protein and tea saponin vegetable protein in a weight ratio of (0.5-1.5): 1.

in some preferred embodiments, the foam stabilizer is any one or a mixture of several of sodium fatty alcohol-polyoxyethylene ether sulfate, sodium alpha-alkenyl sulfonate and dodecyl dimethyl amine oxide. In some more preferred embodiments, the foam stabilizer is dodecyl dimethyl amine oxide, which can reduce the repulsive force of anionic groups of the liquid film anionic surfactant, thereby realizing foam stabilization. And the foam material can be combined with vegetable protein, so that the opening rate of bubbles is reduced, and the communication rate among foams is reduced, thereby ensuring that the air holes are distributed more uniformly.

In some preferred embodiments, the early strength agent is selected from any one or a mixture of triisopropanolamine, calcium formate, sodium nitrite, acetic acid and acetate. In some more preferred embodiments, the early strength agent is a mixture of triisopropanolamine and sodium nitrite, and the weight ratio is (8-12): 1, the early strength development rate of the foam concrete can be greatly improved, and the early strength of the foam concrete is improved; but also can promote the surface of the steel bar to form a compact protective film to prevent the steel bar in the foam concrete from being corroded; in addition, the stability of the liquid film is not influenced.

In some preferred embodiments, the reinforcing fibers are polypropylene fibers and have a tensile strength greater than 500Mpa, which can improve the strength of the foamed concrete. In some preferred embodiments, the polypropylene fibers have a diameter of 15-50 μm and a length of 8-15 mm, have a good length-diameter ratio, are beneficial to absorbing impact energy, reduce a local stress concentration phenomenon caused by blocking of impact waves, and also relieve the effect of internal stress of concrete caused by temperature change, thereby preventing the expansion of temperature cracks. The air holes formed in the foam concrete have better stability, so that the impact resistance and the toughness of the foam concrete are further improved.

The thickening agent is selected from one or a mixture of more of Arabic gum, xanthan gum and guar gum.

The present invention will be specifically described below by way of examples. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above disclosure are still within the scope of the present invention.

In addition, the starting materials used are all commercially available, unless otherwise specified.

Examples

The technical solution of the present invention is described in detail by the following examples, but the scope of the present invention is not limited to the examples.

Example 1

Embodiment 1 provides an early strength reinforced composite foam concrete foaming agent, which comprises, by mass, 35% of a foaming component, 15% of a foam stabilizer, 3% of an early strength agent, 3% of a reinforcing fiber, 1% of a thickener and 43% of water.

The foaming component is a mixture of sodium dodecyl sulfate, saponin plant protein and tea saponin plant protein, and the weight ratio is 1.2: 1: 1.

the foam stabilizer is dodecyl dimethyl amine oxide.

The early strength agent is triisopropanolamine and sodium nitrite, and the weight ratio is 10: 1.

the reinforced fiber is polypropylene fiber, has the tensile strength of 599Mpa, the diameter of 18-48 mu m and the length of 12mm, and is purchased from Beijing Boshundada architecture decoration engineering Co.

The thickening agent is xanthan gum.

Example 2

Similarly to example 1, an early-strength reinforced composite foam concrete foaming agent is provided, but in the preparation raw materials, by mass percentage, the foaming component is 25%, the foam stabilizer is 15%, the early-strength agent is 3%, the reinforcing fiber is 3%, the thickening agent is 1%, and the water is 53%.

Example 3

Similarly to example 1, an early-strength reinforced composite foam concrete foaming agent is provided, but in the preparation raw materials, by mass percentage, the foaming component is 45%, the foam stabilizer is 15%, the early-strength agent is 3%, the reinforcing fiber is 3%, the thickening agent is 1%, and the water is 23%.

Comparative example 1

Similar to example 1, an early-strength reinforced composite foam concrete foaming agent and a preparation method thereof are provided, wherein the preparation raw materials comprise, by mass, 20% of a foaming component, 15% of a foam stabilizer, 3% of an early-strength agent, 3% of a reinforcing fiber, 1% of a thickening agent and 58% of water.

Comparative example 2

An early strength enhanced composite foam concrete blowing agent was provided similar to example 1, but the surfactant was an anionic surfactant and the blowing component was sodium lauryl sulfate.

Comparative example 3

An early strength enhanced composite foam concrete foamer was provided similar to that of example 1, but with the foaming component being a saponin vegetable protein.

Comparative example 4

An early strength enhanced composite foam concrete foaming agent and a preparation method thereof are provided similarly to example 1, but the early strength agent is triisopropanolamine.

Comparative example 5

An early strength reinforced composite foam concrete foaming agent and a preparation method thereof are provided similarly to example 1, but the content of the polypropylene fiber is 0.

Evaluation of Performance

1. Test of expansion ratio

The foaming ratios of the foaming agents prepared in examples 1 to 3 and comparative examples 1 to 5 were respectively tested according to the test method specified in JG/T266-.

2. Test for compressive Strength

The cement, the coal ash and the water are prepared according to the weight ratio of 2:1:1, stirred and mixed uniformly to prepare cement slurry. And (3) respectively adding a certain amount of water to dilute the foaming agents prepared in the examples 1-3 and the comparative examples 1-5, wherein the weight ratio of the foaming agent to the diluting water is 1:10, and placing the foaming agents and the diluting water into a container to stir for 5min to prepare foam slurry. Respectively pouring the foam slurry into a cement mortar stirring pot, wherein the weight ratio of the foam slurry to the cement slurry is 1:1000, stirring until the foam cement mortar is uniform and stable, pouring into a mould, demoulding after one day, and naturally curing for 28 days to obtain a foam concrete sample.

And (3) placing the sample in a hydraulic tension tester, testing the pressure at a uniform speed until the sample is completely destroyed, recording the maximum destruction strength of the sample, and if the strength is greater than 4MPa, recording the strength as strong, and if the strength is less than 4MPa, recording the strength as low, wherein the results are shown in table 1.

3. Cell quality

Observing the shapes of the inner cells of the foam concrete sample, if the sizes of the cells are uniform, the cells are uniformly distributed, and no large pores or communicating pores exist, marking as good, otherwise, marking as poor; the results are shown in Table 1.

TABLE 1

Examples	Expansion ratio of foam	Compressive strength	Cell quality
				Example 1	40	High strength	Good taste
Example 2	35	High strength	Good taste
				Example 3	38	High strength	Good taste
Comparative example 1	21	Is low in	Difference (D)
				Comparative example 2	13	Is low in	Difference (D)
Comparative example 3	8	Is low in	Difference (D)
				Comparative example 4	33	Is low in	Good taste
Comparative example 5	31	Is low in	Good taste

The embodiments 1-3 and the comparative examples 1-5 show that the early strength enhanced composite foam concrete foaming agent provided by the invention has good foaming capacity and foaming stability, the size of the foam pores formed in the foam concrete is uniform and the foam pores are uniformly distributed, the early strength of the concrete can be improved, the foaming agent does not contain chloride, and the influence on reinforced concrete and concrete with metal embedded parts is reduced.

Finally, it should be understood that the above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.