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A kind of mass concrete and its preparation and construction technology

A technology of mass concrete and construction technology, applied in the direction of construction and building structure, can solve the problems of undisclosed mass concrete and cracks, and achieve the effect of increasing heat dissipation, reducing cracks, and reducing cracking phenomenon.

Active Publication Date: 2021-02-09
上海石化安东混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the admixture SPA added to the formula can reduce the heat of hydration by reducing the amount of cement and further reduce the cracks of concrete, cracks still appear in the actual construction process
And this patent document does not disclose specific methods about how to prepare mass concrete

Method used

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  • A kind of mass concrete and its preparation and construction technology
  • A kind of mass concrete and its preparation and construction technology
  • A kind of mass concrete and its preparation and construction technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Mass concrete includes the following weight components: 170kg of water, 180kg of cement, 730kg of medium sand, 1000kg of gravel with a particle size of 5-25mm, 100kg of external admixtures, 175kg of mineral powder, and 5.11kg of admixtures; admixtures include water reducers And retarder; water reducer is 5.1kg of sodium lignosulfonate.

[0057] The external admixture specifically includes fly ash, bentonite and bamboo fiber. Concrete fly ash is 73kg, bentonite is 25kg, and bamboo fiber is 2kg.

[0058] The retarder includes 0.002kg of modified pulp black liquor, 0.004kg of maltose, 0.0011kg of chitosan, 0.0018kg of milk of lime, 0.001kg of calcium lignosulfonate, and 0.0001kg of aluminum sulfate.

[0059] Modified pulp black liquor includes the following treatment process: use sulfuric acid to adjust the pH to 10, add 0.002g of ferric chloride and 0.4g of sodium sulfite in pulp black liquor, keep the temperature at 80°C for 2 hours, and then neutralize with sulfuric ac...

Embodiment 2

[0071] The difference between the second embodiment and the first embodiment lies in the different contents of the concrete components, the different parameters in the modified pulp black liquor, concrete processing and construction technology.

[0072] See Table 1 and Table 2 for components.

[0073] Modified pulp black liquor includes the following treatment process: use sulfuric acid to adjust the pH to 10, add 0.0025g of ferric chloride and 0.5g of sodium sulfite to pulp black liquor, keep the temperature at 80°C for 3 hours, and then neutralize with sulfuric acid to The pH is 8.

[0074] The preparation method of mass concrete comprises the following preparation steps,

[0075] Step 1: Weigh each component of the mass concrete according to parts by weight, and set aside;

[0076] Step 2: Add cement, medium sand, crushed stone, external admixture, mineral powder and water into the mixer and stir for 2 minutes, mix well;

[0077] Step 3: Continue to add the admixture to ...

Embodiment 3

[0084] The difference between the third embodiment and the first embodiment lies in the different contents of the concrete components, the different parameters in the modified pulp black liquor, concrete processing and construction technology.

[0085] See Table 1 and Table 2 for components.

[0086] Modified pulp black liquor includes the following treatment process: use sulfuric acid to adjust the pH to 11, add 0.006g of ferric chloride and 0.12g of sodium sulfite in pulp black liquor, keep the temperature at 85°C for 4 hours, and then neutralize with sulfuric acid to The pH is 9.

[0087] The preparation method of mass concrete comprises the following preparation steps,

[0088] Step 1: Weigh each component of the mass concrete according to parts by weight, and set aside;

[0089] Step 2: Add cement, medium sand, crushed stone, external admixture, mineral powder and water into the mixer and stir for 3 minutes, mix well;

[0090] Step 3: Continue to add the admixture to t...

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Abstract

The invention discloses a mass concrete and a preparation and construction process thereof, and relates to the field of concrete. It aims to improve the problem of concrete cracking by improving the concrete formulation and concrete construction process. The concrete includes the following components in parts by weight, 170-180 parts of water, 180-185 parts of cement, 635-730 parts of medium sand, 1,000-1,100 parts of crushed stone with a particle size of 5-25mm, and 94-100 parts of external admixtures , 160-175 parts of mineral powder, and 5.11-5.12 parts of admixtures; the admixtures include water reducer and retarder. In the construction, through layered and partitioned construction, after the concrete construction of each layer is completed, several stainless steel punching network pipes are inserted into the concrete. From the formula to the construction, it has been improved. Among them, the addition of retarder to the concrete formula can effectively improve the peak hydration period of the concrete and reduce the cracking phenomenon after the concrete solidifies; the use of stainless steel punching network pipes during the concrete construction process increases the The heat dissipation effect of concrete further reduces cracks in concrete caused by the heat of hydration.

Description

technical field [0001] The invention relates to the field of concrete, in particular to a large-volume concrete and its preparation and construction technology. Background technique [0002] The interpretation of mass concrete in "Code for Construction of Mass Concrete" includes two dimensions: property and volume. In terms of volume, mass concrete refers to the concrete with the minimum geometric dimension of the structure entity not less than 1m; in terms of nature, it refers to the concrete with cracks caused by the shrinkage and temperature changes caused by the hydration of cementitious materials concrete. [0003] With the rapid development of social economy, the probability of mass concrete used in various modern construction projects such as high-rise buildings, water conservancy projects, and large-scale equipment for construction is getting higher and higher. The main characteristics of mass concrete are its large volume, rapid internal temperature rise, and rela...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00E04B1/16
CPCC04B28/00C04B2201/50E04B1/16C04B14/06C04B14/02C04B18/08C04B14/102C04B18/265C04B18/12C04B24/18C04B18/241C04B22/064C04B22/148C04B24/10C04B24/121
Inventor 顾连林袁冬生张耀
Owner 上海石化安东混凝土有限公司
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