Crack-resistant concrete and mortar admixture capable of adjusting setting time

Abstract

The invention discloses a concrete and mortar admixture capable of adjusting setting time and resisting crack, which comprises the following components in percentage by weight: 20 to 35 percent of modified fine bone meal, 4 to 10 percent of polyacrylate emulsion, 1.5 to 3.5 percent of early strength agent, 0.2 to 1 percent of accelerator, 15 to 20 percent of admixture and the balance of water. Compared with the prior art, the concrete and mortar admixture capable of adjusting the setting time and resisting cracking has the advantages that the concrete setting time can be adjusted, and the anti-cracking function is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of crack-resistant concrete, in particular to concrete and mortar admixtures capable of adjusting setting time and resisting cracking. Background Art

[0002] Ordinary concrete is a structure or component with a certain structural strength obtained by mixing cement as a gelling material, sand and stone as aggregates, and water (with or without admixtures and additives) in a certain proportion, through mixing, molding, curing, and hardening. Cement is the main component of concrete and determines the basic properties of concrete. Concrete admixtures can make up for and improve the deficiencies in concrete performance and give it some new properties. They are an important component of concrete.

[0003] During the existing concrete processing and use, micro-expansion and contraction easily occur during its consolidation process, which causes concrete cracks and stress cracks, making its durability unsatisfactory. In addition, most of the existing admixtures have a single function, which makes them inconvenient to use. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the above technical defects and provide a concrete and mortar admixture that can adjust the setting time of concrete and has anti-cracking function.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is: a concrete and mortar admixture capable of adjusting the setting time and crack resistance, comprising modified fine bone powder, polyacrylate emulsion, an early strength agent, an accelerator, admixtures and the balance of water, wherein the weight ratio of each substance is: 20-35% of modified fine bone powder, 4-10% of polyacrylate emulsion, 1.5-3.5% of early strength agent, 0.2-1% of accelerator and 15-20% of admixture.

[0006] Preferably, the admixture includes one or more combinations of fly ash, slag powder and silica fume.

[0007] Preferably, the accelerating setting agent is at least one of sodium aluminate, aluminum sulfate, triethanolamine and calcium formate.

[0008] Preferably, the early strength agent is at least one of calcium chloride and sodium sulfate.

[0009] Preferably, the modified fine bone powder includes at least one of quartz sand powder, limestone powder and dolomite powder, and the selected fine bone powder is soaked in a modifier and then dried to obtain the modified fine bone powder.

[0010] Preferably, the modifier is a polyvinyl alcohol solution.

[0011] Preferably, the polyacrylate emulsion comprises: methyl methacrylate, methacrylic acid, butyl acrylate, acrylic acid, and emulsifiers of sodium lauryl sulfate and potassium persulfate.

[0012] The advantages of the present invention compared with the prior art are: in the present invention, by improving the admixtures, additional modified fine bone powder, polyacrylate emulsion and early strength agent are added for combination, so that the setting time of concrete can be greatly shortened, the early strength can be improved while increasing the strength of concrete, and the adhesion, impermeability and crack resistance of concrete can be improved by combining modified fine bone powder with polyacrylate emulsion. DETAILED DESCRIPTION

[0013] References to embodiments of the present invention will now be provided in detail, one or more examples of which are described below. Each example is provided as an explanation rather than a limitation of the present invention. In fact, it will be apparent to those skilled in the art that various modifications and variations may be made to the present invention without departing from the scope or spirit of the present invention. For example, a feature illustrated or described as part of one embodiment may be used in another embodiment to produce a further embodiment.

[0014] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0015] The terms "comprises," "comprising," or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0016] Except as shown in the operating examples or otherwise indicated, all numbers used in the specification and claims to indicate the amount of ingredients, physicochemical properties, etc. are understood to be adjusted by the term "about" in all cases. For example, therefore, unless otherwise indicated, the numerical parameters listed in the above specification and the attached claims are approximate values, and those skilled in the art can use the teachings disclosed herein to seek to obtain the desired properties and appropriately change these approximate values. The use of numerical ranges expressed as endpoints includes all numbers within the range and any range within the range, for example, 1 to 5 includes 1, 1.1, 1.3, 1.5, 2, 2.75, 3, 3.80, 4 and 5, etc.

[0017] As shown in the figure, the concrete and mortar admixtures which can adjust the setting time and crack resistance include modified fine bone powder, polyacrylate emulsion, early strength agent, accelerator, admixtures and the balance of water, wherein the weight ratio of each substance is: modified fine bone powder 20-35%, polyacrylate emulsion 4-10%, early strength agent 1.5-3.5%, accelerator 0.2-1% and admixture 15-20%.

[0018] In specific use, the admixture includes one or a combination of fly ash, slag powder, and silica fume.

[0019] The accelerating setting agent is at least one of sodium aluminate, aluminum sulfate, triethanolamine and calcium formate, and the early strength agent is at least one of calcium chloride and sodium sulfate.

[0020] In one embodiment:

[0021] The modified fine bone powder includes at least one of quartz sand powder, limestone powder, and dolomite powder. The selected fine bone powder is added with a modifier, soaked and then dried to obtain the modified fine bone powder. The modifier is a polyvinyl alcohol solution. The selected fine bone powder is modified by soaking in the polyvinyl alcohol solution to form a thin film on its surface, which improves its performance and its bonding strength with substrates such as cement, thereby enhancing the mechanical properties and durability of concrete.

[0022] The polyacrylate emulsion includes: methyl methacrylate, methacrylic acid, butyl acrylate, acrylic acid, emulsifier sodium lauryl sulfate, and potassium persulfate.

[0023] The present invention is specifically implemented:

[0024] 25% modified fine bone powder, 8% polyacrylate emulsion, 2.5% early strength agent, 0.5% accelerating setting agent, and 17% admixture, among which the admixture is slag powder, the accelerating setting agent is sodium aluminate, and the early strength agent is calcium chloride.

[0025] Mix the modified fine bone powder, polyacrylate emulsion, admixtures and other dry materials evenly.

[0026] The polyacrylate emulsion should first be mixed with water to form an emulsion, and then stirred together with other dry materials. Add an appropriate amount of water and continue stirring until a uniform concrete or mortar is formed. Add the early strength agent and the accelerator in sequence to the mixed concrete or mortar. The mixed concrete or mortar should be quickly transported to the construction site for pouring or plastering.

[0027] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0028] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection claimed in the present invention is defined by the attached claims and their equivalents. Therefore, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0029] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0030] The present invention and its implementation methods are described above, and such description is not restrictive. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design structures and embodiments similar to the technical solution without creativity, which should all fall within the protection scope of the present invention.

Claims

1. A concrete and mortar admixture capable of adjusting setting time and crack resistance, characterized in that: The invention comprises modified fine bone powder, polyacrylate emulsion, early strength agent, accelerating setting agent, admixture and balance water, wherein the weight ratio of each substance is: modified fine bone powder 20-35%, polyacrylate emulsion 4-10%, early strength agent 1.5-3.5%, accelerating setting agent 0.2-1% and admixture 15-20%.

2. The concrete and mortar admixture capable of adjusting setting time and crack resistance according to claim 1, characterized in that: The admixture includes one or a combination of fly ash, slag powder and silica fume.

3. The concrete and mortar admixture capable of adjusting setting time and crack resistance according to claim 1, characterized in that: The accelerating setting agent is at least one of sodium aluminate, aluminum sulfate, triethanolamine and calcium formate.

4. The concrete and mortar admixture capable of adjusting setting time and crack resistance according to claim 1, characterized in that: The early strength agent is at least one of calcium chloride and sodium sulfate.

5. The concrete and mortar admixture capable of adjusting setting time and crack resistance according to claim 1, characterized in that: The modified fine bone powder includes at least one of quartz sand powder, limestone powder and dolomite powder. The selected fine bone powder is soaked with a modifier and then dried to obtain the modified fine bone powder.

6. The concrete and mortar admixture capable of adjusting setting time and crack resistance according to claim 5, characterized in that: The modifier is a polyvinyl alcohol solution.

7. The concrete and mortar admixture capable of adjusting setting time and crack resistance according to claim 1, characterized in that: The polyacrylate emulsion comprises: methyl methacrylate, methacrylic acid, butyl acrylate, acrylic acid, emulsifiers sodium lauryl sulfate and potassium persulfate.