Method for improving expansion adaptability of cement
By adding C3A and gypsum to the cement and combining the use of water reducer, the problem of insufficient cement adaptability is solved, the compressive and flexural strength of the cement is significantly improved, the initial setting time is shortened, the amount of water is reduced, and the high-strength concrete preparation of cement and the adaptability of large-scale engineering applications is achieved.
Patent Information
- Application Number
- CN202510418509.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-03
- Publication Date
- 2025-06-06
AI Technical Summary
Existing cement products have insufficient adaptability in high-strength concrete preparation and large-scale engineering applications, which can easily lead to concrete cracking, slump loss and poor fluidity.
By adding clinker C3A and gypsum to the cement and combining an appropriate amount of water reducing agent to uniformly mix, the composition of the cement is adjusted to improve its adaptability.
The compressive strength and flexural strength of the cement are significantly improved, the initial setting time is shortened, the amount of water is reduced, and the adaptability of the cement is improved, so that the P.O42.5 grade cement can be prepared with C50-grade concrete, reducing the clinker consumption ratio, and thus reducing production costs.
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Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of cement, and in particular relates to a method for improving the expansion adaptability of cement. Background Art
[0002] Due to the technical progress of concrete, the use of high-efficiency water-reducing agents, lower water-cement ratio and larger slump, the strength of cement and concrete is no longer linearly related, and concrete is required to have better working performance. Since the performance of cement is directly related to the working performance and quality of concrete, the quality of cement should not only meet the requirements of national standards, but also improve the adaptability and stability of cement to meet customer needs and improve the competitiveness of products.
[0003] At present, whether it is P.O42.5 cement or P.C42.5 cement, the standard consistency water consumption, setting time, compatibility with admixtures and other properties of cement are relatively poor, which will lead to a high risk of concrete cracking and a large loss of concrete slump. In order to ensure the working performance of concrete, the amount of water reducer used or the water-cement ratio is increased, resulting in poor adaptability of cement products. For example, P.O42.5 cement cannot be used to prepare concrete with a grade of C50 or above in large-scale projects and commercial concrete, and the floor slabs cast in the civil market are prone to cracking. When used for home decoration, the pure slurry cement dries quickly and has poor fluidity, tiles are easy to fall off, and the surface is not smooth. Summary of the invention
[0004] The present invention aims to provide a method for improving the expansion adaptability of cement, so as to improve the adaptability of cement.
[0005] A method for improving the expansion adaptability of cement in this scheme comprises the following steps:
[0006] Step 1: Add clinker C3A and gypsum to cement and mix them evenly, then add water reducer and mix evenly to obtain a mixture, wherein C3A accounts for 7% to 8% of the weight of cement, and the amount of gypsum added is based on the SO 3 The content is 2.9% ± 0.3%, and the water reducer accounts for 1.8% to 2.2% of the cement weight;
[0007] Step 2: Add water to the compound and stir evenly.
[0008] Furthermore, the C3A accounts for 7.49% of the weight of the cement.
[0009] Furthermore, the water reducing agent accounts for 2% of the weight of the cement.
[0010] Furthermore, in step 2, the weight ratio of water to cement is 8 to 10:30.
[0011] Further, the weight ratio of water to cement is 9:30.
[0012] Furthermore, the specific surface area of the cement is 335±15m 2 / kg.
[0013] The beneficial effects of this application are: after the cement adaptability is improved, the strength of P.O42.5 grade cement only needs to be controlled at 48Mpa to prepare C50 grade concrete, and the clinker consumption ratio is reduced by 1.5%. For every 1% decrease in the clinker consumption ratio, the cement cost is reduced by 2.5 yuan / ton, which greatly saves energy and reduces consumption for enterprises. DETAILED DESCRIPTION
[0014] The following is further described in detail through specific implementation methods:
[0015] Embodiment 1, a method for improving the expansion adaptability of cement, characterized in that it comprises the following steps:
[0016] Step 1: Add clinker C3A (tricalcium aluminate) and gypsum to cement and mix well, then add water reducer and mix well to obtain a mixture, wherein C3A accounts for 7.49% of the weight of cement, and the amount of gypsum added is based on the SO 3 The content is 2.9%±0.3%, and the water reducer accounts for 2% of the weight of cement; the cement is P.042.5 type cement produced by the applicant, and the water reducer is HT-HPC polycarboxylic acid high performance water reducer sold by Guizhou Huangteng Building Materials Co., Ltd.
[0017] Step 2: Add water to the compound and stir evenly, wherein the weight ratio of water to cement is 9:30.
[0018] The only difference between Comparative Example 1 and Example 1 is that no clinker C3A (tricalcium aluminate) is added to the cement.
[0019] The only difference between Comparative Example 2 and Example 1 is that fly ash is used to replace clinker C3A (tricalcium aluminate).
[0020] According to the standard of GB / T 17671-2021, the cement mixtures prepared in Example 1 and Comparative Examples 1 to 2 were respectively prepared into 40 mm*40 mm*160 mm prisms. Three prism samples prepared in each example were selected to test their compressive strength and flexural strength. The test results are shown in the following table:
[0021]
[0022] The initial setting time and final setting time of the cement mixtures prepared in Example 1 and Comparative Examples 1 to 2 were tested according to the standard of GB / T_1346-2011, and the test results are shown in the following table:
[0023] Initial setting time (min:s) Final setting time (min:s) Example 1 68.2 415.3 Comparative Example 1 47.6 368.5 Comparative Example 2 59.3 435.8
[0024] From the test results of the prepared cement mixture, it can be seen that the method of the present application can significantly improve the compressive lightness and flexural strength of cement; the initial setting time can be increased, the final setting time can be shortened; and the amount of water used can be reduced, thereby effectively improving the adaptability of cement.
[0025] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.
Claims
1. A method for improving the expansion adaptability of cement, characterized in that: The following steps are involved: Step 1, adding clinker C3A and gypsum to cement and mixing evenly, then adding a water reducer and mixing evenly to obtain a mixture, wherein C3A accounts for 7% to 8% of the weight of the cement, the amount of gypsum added is based on the content of SO3 in the cement being 2.9% ± 0.3%, and the water reducer accounts for 1.8% to 2.2% of the weight of the cement; Step 2: Add water to the compound and stir evenly.
2. A method for improving the expansion adaptability of cement according to claim 1, characterized in that: The C3A accounts for 7.49% of the cement weight.
3. A method for improving the expansion adaptability of cement according to claim 2, characterized in that: The water reducing agent accounts for 2% of the weight of the cement.
4. A method for improving the expansion adaptability of cement according to claim 3, characterized in that: In step 2, the weight ratio of water to cement is 8 to 10:
30.
5. A method for improving the expansion adaptability of cement according to claim 4, characterized in that: The weight ratio of water to cement is 9:
30.
6. A method for improving the expansion adaptability of cement according to any one of claims 1 to 5, characterized in that: The specific surface area of the cement is 335±15m 2 / kg.