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Mass concrete

A large-volume concrete and concrete recycling technology, applied in the field of concrete materials, can solve the problems of slow heat dissipation, small surface coefficient, and cracks in large-volume concrete, and achieve the effects of reducing resource waste, reducing environmental pollution, and reducing cracking

Inactive Publication Date: 2019-02-22
陕西天石实业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the large volume of mass concrete, its surface coefficient is relatively small, the release of cement hydration heat is relatively concentrated, and the heat dissipation is slow, resulting in relatively rapid internal temperature rise. When the temperature difference between the inside and outside of mass concrete is large, cracks will occur in mass concrete. , affecting the safety and normal use of the structure, so there is still room for improvement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A mass concrete made by the following steps:

[0053] (1) Add 60kg of optically active polytrityl methacrylate and 30kg of silane coupling agent into the kneader, raise the temperature to 165°C, and stir at constant temperature for 180s to form a premix;

[0054] (2) Add 275kg of Portland cement, 12kg of water reducing agent and 156kg of water into the first stirring tank at a rotating speed of 80r / min, and stir for 10min to form cement slurry;

[0055] (3) Add 60kg of acetone in the second stirred tank, cool the premix to room temperature and then add it into the second stirred tank at a speed of 40r / min, and stir until the premix is ​​completely dissolved to form a premix solution;

[0056] Then add the premix solution into the cement slurry in the first stirred tank, and stir with a rotating speed of 120r / min through the first stirred tank, and stir for 15 minutes to stir evenly;

[0057] (4) Add copper powder 22kg and expansion agent 22kg in the first stirring tank...

Embodiment 2

[0068] A mass concrete made by the following steps:

[0069] (1) Add 64kg of optically active polytrityl methacrylate and 32kg of silane coupling agent into the kneader, raise the temperature to 165°C, and stir at constant temperature for 180s to form a premix;

[0070] (2) Add 275kg of Portland cement, 14kg of water reducer and 156kg of water into the first stirring tank at a rotating speed of 80r / min and stir for 10min to form cement slurry;

[0071] (3) 64kg of acetone is added in the second stirred tank, and the premix is ​​cooled to room temperature and then added into the second stirred tank at a speed of 40r / min, and stirred until the premix is ​​completely dissolved to form a premix solution;

[0072] Then add the premix solution into the cement slurry in the first stirred tank, and stir with a rotating speed of 120r / min through the first stirred tank, and stir for 15 minutes to stir evenly;

[0073] (4) Add copper powder 24kg and expansion agent 24kg in the first sti...

Embodiment 3

[0084] A mass concrete made by the following steps:

[0085] (1) Add 68kg of optically active polytrityl methacrylate and 34kg of silane coupling agent into the kneader, raise the temperature to 165°C, and stir at constant temperature for 180s to form a premix;

[0086] (2) Add 275kg of Portland cement, 15kg of water reducer and 156kg of water into the first stirring tank at a rotating speed of 80r / min, and stir for 10min to form cement slurry;

[0087] (3) Add 68kg of acetone in the second stirred tank, add the premix in the second stirred tank after being cooled to room temperature, and stir until the premix is ​​completely dissolved to form a premix solution;

[0088] Then add the premix solution into the cement slurry in the first stirred tank, and stir with a rotating speed of 120r / min through the first stirred tank, and stir for 15 minutes to stir evenly;

[0089] (4) Add copper powder 25kg and expansion agent 26kg in the first stirring tank, rotating speed 85r / min, sti...

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Abstract

The invention relates to the technical field of concrete materials and provides mass concrete aiming to solve the problem of cracking of the mass concrete. The technical scheme is that the mass concrete is prepared from the following components in parts by mass: 275 parts of Portland cement, 80-90 parts of fly ash, 60-70 parts of mineral powder, 12-16 parts of a water reducer, 22-28 parts of an expansive agent and 1780-1850 parts of concrete r recycled packing. By adding the expansive agent, when the mass concrete cracks due to hydration heat of cement, the mass concrete expands towards a low-pressure place, then cracked part of the mass concrete is filled, and strength stability of the mass concrete is better; waste of waste and old concrete can be reduced by adopting the concrete recycled packing, and treatment cost of recycled concrete is reduced.

Description

technical field [0001] The invention relates to the technical field of concrete materials, in particular to a large-volume concrete. Background technique [0002] my country's "Code for Construction of Mass Concrete" GB50496-2009 stipulates that the minimum geometric size of the concrete structure is not less than 1m, or it is expected to cause harmful cracks due to temperature changes and shrinkage caused by the hydration of the cementitious material in the concrete. The resulting concrete is called mass concrete. [0003] Due to the large volume of mass concrete, its surface coefficient is relatively small, the release of cement hydration heat is relatively concentrated, and the heat dissipation is slow, resulting in relatively rapid internal temperature rise. When the temperature difference between the inside and outside of mass concrete is large, cracks will occur in mass concrete. , affecting the safety and normal use of the structure, so there is still room for improve...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B24/26C04B14/34C04B111/34
CPCC04B14/34C04B24/2641C04B28/04C04B2111/343C04B2201/50C04B18/08C04B18/141C04B24/24C04B2103/0068C04B24/42C04B22/002C04B24/008C04B18/16
Inventor 刘鹏张峰杨雪琴
Owner 陕西天石实业有限责任公司