A ferro-aluminate cement concrete hydration heat release regulating material and a preparation method thereof

Abstract

The application belongs to the technical field of admixtures of building materials, and particularly relates to a hydration heat release regulating material for ferrialuminate cement concrete and a preparation method thereof. The hydration heat release regulating material comprises a hydration heat release regulating component and a shell, and the hydration heat release regulating component comprises at least one of boric acid, borax, citric acid and sodium gluconate, and the shell material comprises 60-80% of polyethylene wax and 20-40% of low-melting-point paraffin. The hydration heat release regulating material is obtained by melting the polyethylene wax, mixing and stirring the regulating component, spraying and granulating, melting the low-melting-point paraffin, adding the granules and stirring and spraying again. The shell material can play a role under certain temperature conditions, the effect of controlling the release rate of the core material can be achieved, the application has the characteristics of strong pertinence, quick effect, no influence on strength, environmental protection and low cost.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of admixtures for building materials, and particularly relates to a hydration heat release regulation material for ferrite aluminate cement concrete and a preparation method thereof. BACKGROUND

[0002] In concrete engineering, cracking is a problem that must be faced. Cracking can lead to a series of problems such as strength reduction, ion erosion, leakage, and the like, which affect the safety and durability of concrete. Especially for casting mass concrete, the concrete has a high strength grade, a thick size, and a high requirement for continuous casting, and the cement heat release is more concentrated, which is more likely to cause cracking. Ferrite aluminate cement is a third series of cement independently developed by China. Generally, anhydrous calcium sulphoaluminate, dicalcium silicate, and calcium ferrite aluminate are used as base minerals, wherein the proportion of anhydrous calcium sulphoaluminate is about 33% to 63%, the proportion of dicalcium silicate is about 14% to 37%, and the proportion of calcium ferrite aluminate is about 15% to 35%. Anhydrous calcium sulphoaluminate has a fast hydration rate, and a large amount of heat is released in early hydration, and the heat release is concentrated. Therefore, ferrite aluminate cement has fast early hydration and fast strength development, and is more likely to cause temperature cracking problems.

[0003] In recent years, in order to solve the problems of fast cement hydration and large and concentrated heat release, many researchers have started to study hydration reaction rate regulation materials. The existing patent CN201910170750.6 discloses a composite controllable hydration heat cement-based material, mainly including a crosslinking agent, an organic acid, and a starch-based high molecular organic substance, and is mainly directed to Portland cement. The existing patent CN201811641587.9 discloses a starch-based hydration heat regulation material, and the Chinese patent CN201410010473.X discloses a hydration heat regulation material with dextrin as the main component. The currently published patents are all directed to Portland cement, and the core materials for regulating temperature are all organic substances.

[0004] In summary, although the existing research has certain hydration rate control methods, there are still problems such as complex preparation of organic substances, environmental pollution, and inapplicability to ferrite aluminate cement. SUMMARY

[0005] In view of the problems of complex preparation process, environmental pollution, and poor effect on ferrite aluminate cement in the prior art, the application provides a hydration heat release regulation material for ferrite aluminate cement concrete and a preparation method thereof, which can simplify the preparation process on the basis of inhibiting the temperature rise of ferrite aluminate cement hydration, and mainly uses inorganic components as raw materials, and does not have environmental problems.

[0006] The specific technical scheme of the application is as follows:

[0007] A hydration heat release regulating material for ferrialuminate cement concrete, comprising a hydration heat release regulating component and a shell, the material is wrapped by the shell, the shell is a porous structure, and the pores of the shell are filled, and the hydration heat release regulating component accounts for 70-90% and the shell accounts for 10-30% by weight.

[0008] Preferably, the hydration heat release regulating component is at least one of boric acid, borax, citric acid, and sodium gluconate.

[0009] Preferably, the shell material is polyethylene wax and low-melting-point paraffin, and the polyethylene wax accounts for 60-80% and the low-melting-point paraffin accounts for 20-40%.

[0010] A preparation method of a hydration heat release regulating material for ferrialuminate cement concrete, comprising the following steps:

[0011] (1) According to the amount of 1 m3 of concrete, the polyethylene wax is placed in a centrifugal spray dryer, heated to 120-130 DEG C, and heated for 2-2.5 h to completely melt into a liquid;

[0012] (2) The hydration heat release regulating component is added into the liquid polyethylene wax, and stirred for 30-35 min to form a uniform liquid mixture;

[0013] (3) After uniform mixing, centrifugal spray granulation is performed, and in the granulation process, the polyethylene wax wraps the hydration heat release regulating component, and due to the characteristics of the polyethylene wax, the wrapping surface is a porous structure;

[0014] (4) The low-melting-point paraffin is placed in another centrifugal spray dryer, heated to 40-50 DEG C, and heated for 2-2.5 h to completely melt into a liquid;

[0015] (5) The polyethylene wax-wrapped hydration heat release regulating component particles are added into the liquid low-melting-point paraffin, and stirred for 30-35 min to form a uniform liquid mixture;

[0016] (6) After uniform mixing, centrifugal spray granulation is performed, and in the granulation process, the low-melting-point paraffin wraps the original particles to form new particles, the low-melting-point paraffin can completely wrap the particles and fill the original pores to obtain the required hydration heat release regulating material.

[0017] The hydration heat regulating component is an inorganic material, which has the characteristics of simple preparation process, quick effect and low pollution rate. Boric acid, borax, citric acid and sodium gluconate are inorganic hydration heat regulating materials suitable for ferrite-aluminate cement. After contacting with the cement, they can quickly wrap the cement to form an inorganic-cement wrapping body, which will prevent the cement particles from contacting with water and inhibit the hydration process of the cement, so as to control the overall heat release. With the hydration of the cement, the wrapping body gradually breaks and dissolves, and the cement particles re-contact with water, and the wrapped cement continues to participate in the reaction. Through the above process, the staged reaction of the cement is realized, so as to control the hydration heat and the concentrated heat release of hydration.

[0018] On the other hand, the above process is theoretically feasible, but due to the fast reaction of the inorganic material, there are many uncontrollable problems in actual application. Therefore, in order to make the inorganic material more stable, the present application proposes a low-melting-point paraffin and polyethylene wax wrapping material. The material has a porous structure, in which the polyethylene wax constitutes a porous skeleton, and the low-melting-point paraffin fills the voids. When the above structure enters the cement slurry, the initial temperature of the cement reaction is low, and the low-melting-point paraffin cannot melt, so the wrapping body does not participate in the reaction. As the temperature rises, the low-melting-point paraffin melts, and the regulating component contained therein is slowly released under the action of concentration difference, achieving the purpose of better controlling the temperature rise.

[0019] The present application has the following advantages due to the use of the above technical solutions:

[0020] 1. The hydration heat regulating material is divided into shell material and core material. The shell material adopts a porous structure, and low-melting-point paraffin is used for plugging. In this way, the shell material can play a role under certain temperature conditions. On the other hand, the use of a porous structure can control the release rate of the core material by using the concentration gradient, and also achieve the effect of controlling the release rate of the core material.

[0021] 2. The core material uses inorganic hydration heat regulating materials for ferrite-aluminate cement concrete, which has the characteristics of strong pertinence, quick effect, no influence on strength, environmental protection and low cost. And the compatibility with the shell material is good, which is conducive to achieving the overall expected effect.

[0022] 3. The material can be purchased on the market, which is convenient to prepare and has low cost.

[0023] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application and can be implemented according to the content of the specification, the following will be described in detail with the preferred embodiments of the present application. DETAILED DESCRIPTION

[0024] To further clarify the technical means and effects taken by the present application to achieve the predetermined inventive purpose, the following will combine the preferred embodiments to explain the specific implementation of the hydrating heat release regulating material for ferrialuminate cement concrete according to the present application in detail. In addition, one or more specific features, structures, or characteristics in the embodiments can be combined in any suitable form.

[0025] Embodiment 1

[0026] A hydrating heat release regulating material for ferrialuminate cement concrete, comprising a hydrating heat release regulating component and a shell, adopting the structure of wrapping the material with the shell, the shell being a porous structure, and the pores of the shell being filled, and comprising, in percentage by weight: the hydrating heat release regulating component: the shell being 70%:30%.

[0027] The hydrating heat release regulating component is boric acid.

[0028] The shell material is polyethylene wax and low-melting-point paraffin, and the polyethylene wax:low-melting-point paraffin is 80%:20%.

[0029] A preparation method of a hydrating heat release regulating material for ferrialuminate cement concrete, comprising the following steps:

[0030] (1) according to the amount of 1 m3 of concrete, the polyethylene wax is placed in a centrifugal spray dryer, heated to 120℃, and heated for 2.5h to completely melt into a liquid;

[0031] (2) the hydrating heat release regulating component is added to the liquid polyethylene wax, and stirred for 30 minutes to form a uniform liquid mixture;

[0032] (3) after uniform mixing, centrifugal spray granulation is performed, and in the granulation process, the polyethylene wax wraps the hydrating heat release regulating component through cooling and drying, and due to the characteristics of the polyethylene wax, the wrapping surface is a porous structure;

[0033] (4) the low-melting-point paraffin is placed in another centrifugal spray dryer according to the proportion, heated to 40℃, and heated for 2h to completely melt into a liquid;

[0034] (5) the particles of the hydrating heat release regulating component wrapped by the polyethylene wax are added to the liquid low-melting-point paraffin, and stirred for 30 minutes to form a uniform liquid mixture;

[0035] (6) after uniform mixing, centrifugal spray granulation is performed, and in the granulation process, the low-melting-point paraffin wraps the original particles to form new particles through cooling and drying, the low-melting-point paraffin can completely wrap the particles, and the original pores can be filled to obtain the required hydrating heat release regulating material.

[0036] Embodiment 2

[0037] A ferrite aluminate cement concrete hydration heat release control material, including a hydration heat release control component and a shell, the structure of the material is wrapped by the shell, the shell is a porous structure, and the pores of the shell are filled, and the hydration heat release control component includes, by weight percentage: the shell is 90%:10%.

[0038] The hydration heat release control component is a combination of boric acid and borax, and the components are mixed in any ratio.

[0039] The shell material is polyethylene wax and low-melting-point paraffin wax, and the polyethylene wax:low-melting-point paraffin wax is 60%:40%.

[0040] A preparation method of a ferrite aluminate cement concrete hydration heat release control material, including the following steps:

[0041] (1) According to the amount of 1 square of concrete, the polyethylene wax is placed in a centrifugal spray dryer, heated to 130°C, and heated for 2 hours to completely melt into a liquid;

[0042] (2) The hydration heat release control component is added to the liquid polyethylene wax, and stirred for 35 minutes to form a uniform liquid mixture;

[0043] (3) After uniform mixing, centrifugal spray granulation is carried out, and in the granulation process, the polyethylene wax wraps the hydration heat release control component through cooling and drying, and due to the characteristics of the polyethylene wax, the wrapping surface is a porous structure;

[0044] (4) The low-melting-point paraffin wax is placed in another centrifugal spray dryer according to the proportion, heated to 50°C, and heated for 2.5 hours to completely melt into a liquid;

[0045] (5) The polyethylene wax-wrapped hydration heat release control component particles are added to the liquid low-melting-point paraffin wax, and stirred for 35 minutes to form a uniform liquid mixture;

[0046] (6) After uniform mixing, centrifugal spray granulation is carried out, and in the granulation process, the low-melting-point paraffin wax wraps the original particles to form new particles through cooling and drying, the low-melting-point paraffin wax can completely wrap the particles and fill the original pores to obtain the required hydration heat release control material.

[0047] Example 3

[0048] A ferrite aluminate cement concrete hydration heat release control material, including a hydration heat release control component and a shell, the structure of the material is wrapped by the shell, the shell is a porous structure, and the pores of the shell are filled, and the hydration heat release control component includes, by weight percentage: the shell is 80%:20%.

[0049] The hydration heat release control component is a combination of boric acid and borax, and the components are mixed in any ratio.

[0050] The shell material is polyethylene wax and low-melting-point paraffin wax, and the ratio of polyethylene wax to low-melting-point paraffin wax is 70%:30%.

[0051] A preparation method of a hydration heat regulation material for ferrialuminate cement concrete, comprising the following steps:

[0052] (1) According to the amount of 1 square of concrete, the polyethylene wax is placed in a centrifugal spray dryer, heated to 125 DEG C, and heated for 2 hours to completely melt into a liquid;

[0053] (2) The hydration heat regulation component is added to the liquid polyethylene wax, and stirred for 30 minutes to form a uniform liquid mixture;

[0054] (3) After uniform mixing, centrifugal spray granulation is carried out, and in the granulation process, the polyethylene wax wraps the hydration heat regulation component, and due to the characteristics of the polyethylene wax, the wrapping surface is a porous structure;

[0055] (4) The low-melting-point paraffin wax is placed in another centrifugal spray dryer according to the proportion, heated to 45 DEG C, and heated for 2 hours to completely melt into a liquid;

[0056] (5) The particles of the hydration heat regulation component wrapped by the polyethylene wax are added to the liquid low-melting-point paraffin wax, and stirred for 30 minutes to form a uniform liquid mixture;

[0057] (6) After uniform mixing, centrifugal spray granulation is carried out, and in the granulation process, the low-melting-point paraffin wax wraps the original particles to form new particles, and the low-melting-point paraffin wax can completely wrap the particles and fill the original pores to obtain the required hydration heat regulation material.

[0058] The prepared hydration heat regulation material is tested according to CECS / T 10270-2023 "Concrete Temperature Inhibition Anti-Cracking Waterproof Agent". The temperature inhibition rate is 30% to 40%; the initial temperature rise 5 DEG C time difference is 20h to 35h; the water penetration height (28d) is 50mm to 70mm; and the compressive strength ratio (28d) is 100% to 110%.

[0059] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A material for regulating the hydration heat of iron aluminate cement concrete, characterized by comprising: 10% to 50% by weight of a calcium compound; 10% to 50% by weight of a magnesium compound; and 10% to 50% by weight of a sodium compound. The water hydration heat release control component and the shell are wrapped by the shell wrapping material, the shell is a porous structure, and the pores of the shell are filled, and the shell includes the water hydration heat release control component by weight percentage: the shell is 70-90%:10-30%, the shell material is polyethylene wax and low melting point paraffin, and the polyethylene wax:low melting point paraffin is 60-80%:20-40%. The preparation method of the ferrite aluminate cement concrete hydration heat release control material is characterized in that the method includes the following steps: (1) according to the amount of 1 square of concrete, the polyethylene wax is placed in a centrifugal spray dryer, heated to 120-130 DEG C, heated for 2-2.5 hours, and completely melted into a liquid; (2) the hydration heat release control component is added to the liquid polyethylene wax, stirred for 30-35 minutes to form a uniform liquid mixture; (3) after uniform mixing, centrifugal spray granulation is performed, in the granulation process, the polyethylene wax wraps the hydration heat release control component, and due to the characteristics of the polyethylene wax, the wrapping surface is a porous structure; (4) the low melting point paraffin is placed in another centrifugal spray dryer, heated to 40-50 DEG C, heated for 2-2.5 hours, and completely melted into a liquid; (5) the low melting point paraffin is added to the liquid low melting point paraffin, stirred for 30-35 minutes to form a uniform liquid mixture; (6) after uniform mixing, centrifugal spray granulation is performed, in the granulation process, the low melting point paraffin wraps the original particles to form new particles, the low melting point paraffin can completely wrap the particles, can fill the original pores, and the required hydration heat release control material is obtained.

2. The ferrite-aluminate cement hydration heat release control material for cement concrete according to claim 1, characterized in that: The water hydration heat release control component is at least one of boric acid, borax, citric acid, and sodium gluconate.