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Special composite anti-cracking agent for ultra-high-performance concrete

An ultra-high-performance, anti-cracking agent technology, applied in the field of building materials, can solve problems such as high risk of cracking, high dosage, and restrictions on the application of ultra-high-performance concrete engineering

Active Publication Date: 2020-04-10
CCCC SECOND HARBOR ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large amount of cementitious materials used in ultra-high performance concrete, the extremely low water-to-binder ratio, the high content of active mineral admixtures, and the absence of coarse aggregates, it is accompanied by a large amount of damage during the setting and hardening and service after hardening. Shrinkage, high risk of early cracking, which restricts the engineering application of ultra-high performance concrete to a certain extent

Method used

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  • Special composite anti-cracking agent for ultra-high-performance concrete
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  • Special composite anti-cracking agent for ultra-high-performance concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Composite anti-cracking agent for ultra-high performance concrete, composed of the following components by weight: 40 parts of calcined magnesite; 25 parts of aged dehydrated phosphogypsum; 16 parts of quicklime; 8 parts of finely ground steel slag powder; sulfoaluminate 17 parts of cement clinker; 8 parts of polymer surfactant.

[0026] The calcined magnesite is magnesite crushed to a particle size of 10 cm. After being calcined and kept at temperatures of 700° C. and 1100° C. for 3 hours, the calcined magnesite is mixed and ground at a mass ratio of 3:1 to an average particle size of 80 μm.

[0027] The phosphogypsum is a by-product in the wet process of phosphoric acid production. After being discharged, landfilled and aged for more than 1 year, it is dried at 110°C for 4 hours until it is completely dehydrated, and finally ground into powder to obtain aged dehydrated Phosphogypsum powder.

[0028] The quicklime is calcareous lime in accordance with JC / T 621, and me...

Embodiment 2

[0035] Composite anti-cracking agent for ultra-high performance concrete, composed of the following components by weight fraction: 45 parts of calcined magnesite; 25 parts of aged dehydrated phosphogypsum; 11 parts of quicklime; 8 parts of finely ground steel slag powder; sulfoaluminate 17 parts of cement clinker; 8 parts of polymer surfactant.

[0036] The calcined magnesite is magnesite crushed to a particle size of 10 cm. After being calcined and kept at 700° C. and 1100° C. for 3 hours, the calcined magnesite was mixed and ground at a mass ratio of 3:1 to an average particle size of 80 μm.

[0037] The phosphogypsum is a by-product in the process of wet-process phosphoric acid production. After being discharged, landfilled, and aged for more than 1 year, it is dried at 110°C for 4 hours until it is completely dehydrated, and finally ground into powder to obtain aged and dehydrated Phosphogypsum powder.

[0038] The quicklime is calcareous lime in accordance with JC / T 621,...

Embodiment 3

[0045] Composite anti-cracking agent for ultra-high performance concrete, composed of the following components by weight: 50 parts of calcined magnesite; 20 parts of aged dehydrated phosphogypsum; 16 parts of quicklime; 8 parts of finely ground steel slag powder; sulfoaluminate 12 parts of cement clinker; 8 parts of polymer surfactant.

[0046] The calcined magnesite is magnesite crushed to a particle size of 10 cm. After being calcined and kept at 700° C. and 1100° C. for 3 hours, the calcined magnesite was mixed and ground at a mass ratio of 3:1 to an average particle size of 80 μm.

[0047] The phosphogypsum is a by-product in the process of wet-process phosphoric acid production. After being discharged, landfilled, and aged for more than 1 year, it is dried at 110°C for 4 hours until it is completely dehydrated, and finally ground into powder to obtain aged and dehydrated Phosphogypsum powder.

[0048] The quicklime is calcareous lime in accordance with JC / T 621, and meet...

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Abstract

The invention discloses a special composite anti-cracking agent for ultra-high-performance concrete. The composite anti-cracking agent is prepared from the following components in parts by weight: 30-60 parts of calcined magnesite; 20-50 parts of aged dehydrated phosphogypsum; 10-30 parts of quick lime; 8-16 parts of finely grinding steel slag powder; 5-20 parts of sulphoaluminate cement clinker;and 7-10 parts of a polymer surfactant. The composite anti-cracking agent has the effects of improving the volume deformation performance of the ultra-high performance concrete, reducing the crackingrisk of the ultra-high performance concrete and improving the long-term durability of the ultra-high performance concrete.

Description

technical field [0001] The invention relates to the technical field of building materials. More specifically, the invention relates to a special composite anti-cracking agent for ultra-high performance concrete. Background technique [0002] Ultra High Performance Concrete (UHPC) is a new type of cement-based engineering material with ultra-high strength, toughness and durability. It solves the needs of structural engineering to develop towards higher heights, larger spans, and heavier loads, and at the same time adapts to the use in various harsh environments. It is the most creative cement-based engineering material in the past 30 years. A great leap forward in the performance of engineering materials. However, due to the large amount of cementitious materials used in ultra-high performance concrete, the extremely low water-to-binder ratio, the high content of active mineral admixtures, and the absence of coarse aggregates, it is accompanied by a large amount of damage d...

Claims

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Application Information

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IPC IPC(8): C04B24/32C08F283/06C08F222/20
CPCC04B24/32C04B40/0039C08F283/065C04B22/066C04B22/144C04B22/064C04B22/0006C04B22/142C08F222/20
Inventor 张国志杨荣辉陈飞翔覃宗华王敏郑和晖巫兴发田飞代浩彭志辉王江成彭成明刘力杨建平奉思东
Owner CCCC SECOND HARBOR ENG
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