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A high-ductility cement-based composite material for repairing hydraulic concrete structures

A technology of hydraulic concrete and composite materials, which is applied in the field of building materials, can solve the problems of insufficient durability and weak synergy, and achieve the effects of excellent durability, high efficiency and uniform dispersion, and improved bending deformation resistance and earthquake resistance

Active Publication Date: 2020-03-17
NANJING HYDRAULIC RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of insufficient durability of traditional repair materials under severe service conditions and weak synergy with existing structures, the present invention provides a hydraulic concrete structure repair with high durability, high bonding capacity and high deformation capacity high ductility cementitious composites

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The material composition ratio is shown in Table 1:

[0035] Table 1 Mixing ratio of high ductility cement-based composite materials for repairing hydraulic concrete structures (mass parts)

[0036] cement fly ash slag light calcium powder nano-SiO 2

fine aggregate water Superplasticizer polyvinyl alcohol fiber 20 20 60 5 1 25 40 0.1 0.5

[0037] The cement is P·O 42.5 ordinary Portland cement of Nanjing Conch Cement Co., Ltd.; the fly ash is Class I F fly ash of Nanjing Thermal Power Plant; the finely ground slag is S75 grade slag of Maanshan Iron and Steel Co., Ltd.; Chenyang Yuhuashi Filter Material Co., Ltd.’s finely ground quartz sand has a maximum particle size of 1.18mm; light calcium powder is produced by Zibo Longchang Fine Chemical Factory, with an average particle size of 20μm; nano-SiO 2 Produced by Beijing Deke Daojin Technology Co., Ltd., active SiO 2 The content is 95%, and the volume average diameter D(4,3) ...

Embodiment 2

[0040] The material composition ratio is shown in Table 2:

[0041] Table 2 Mixing ratio of high ductility cement-based composite materials for hydraulic concrete structure repair (mass parts)

[0042] cement fly ash slag light calcium powder nano-SiO 2

fine aggregate water Superplasticizer polyvinyl alcohol fiber 60 20 20 10 5 40 20 1 2.5

[0043]The cement is R·SAC 42.5 sulfoaluminate cement from Nanjing Conch Cement Co., Ltd.; the fly ash is Class II F fly ash from Nanjing Thermal Power Plant; the finely ground slag is S95 class slag from Maanshan Iron and Steel Co., Ltd.; the fine aggregate is Nanjing local Natural river sand with a maximum particle size of 5mm; light calcium powder produced by Zibo Longchang Fine Chemical Factory with an average particle size of 45μm; nano-SiO 2 Produced by Beijing Deke Daojin Technology Co., Ltd., active SiO 2 The content is 95%, and the volume average diameter D(4,3) is 95nm; the water redu...

Embodiment 3

[0046] The material composition ratio is shown in Table 3:

[0047] Table 3 Mixing ratio of high ductility cement-based composite materials for hydraulic concrete structure repair (mass parts)

[0048] cement fly ash slag light calcium powder nano-SiO 2

fine aggregate water Superplasticizer polyvinyl alcohol fiber 20 80 0 7.5 2.5 35 30 0.75 2

[0049] The cement is P·MH 42.5 medium-heat cement from Jiahua Special Cement Co., Ltd.; the fly ash is Class I F fly ash of Nanjing Thermal Power Plant; the fine aggregate is artificial sand produced in Nanjing Liuhe, with a maximum particle size of 2.5mm; The powder is produced by Zibo Longchang Fine Chemical Factory, with an average particle size of 35 μm; nano-SiO 2 Produced by Beijing Deke Daojin Technology Co., Ltd., active SiO 2 The content is 97%, and the volume average diameter D(4,3) is 85nm; the water reducing agent is Nanjing Ruidi High-tech Co., Ltd. HLC-Ⅸ polycarboxylate high-p...

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Abstract

The invention discloses a high-ductility cement-based composite material for repairing a hydraulic concrete structure. The cement-based composite material is prepared from the following components in parts by mass: 20 to 60 parts of cement, 0 to 80 parts of fly ash, 0 to 80 parts of pulverized slag powder, 5 to 10 parts of light-weight calcium powder, 1 to 5 parts of nanometer SiO2, 25 to 40 parts of a fine aggregate, 20 to 40 parts of water, 0.1 to 1 part of a water reducing agent and 0.5 to 2.5 parts of polyvinyl alcohol fibers. According to the high-ductility cement-based composite material for repairing the hydraulic concrete structure, the air content of a mixture is 7 to 10 percent; at the 28-day age, the uniaxial tensile strain is greater than or equal to 5.0 percent, the cube compressive strength is greater than or equal to 60MPa, the frost resistance is greater than or equal to F500, the sulfate corrosion resistance is greater than or equal to KS300, the chloride ion penetration resistance DRCM is less than or equal to 2.0*10<-12>m<2> / s, and the tensile bonding strength with base structure concrete is greater than or equal to 5.0MPa. Under the condition of not mixing any air-entraining agent, preservative or thickening agent, the high-ductility cement-based composite material for repairing the hydraulic concrete structure provided by the invention has high durability, enhanced capability in synergistically acting with an existing structure and a remarkable repairing and reinforcing effect.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a high-ductility cement-based composite material for repairing hydraulic concrete structures and an application thereof. Background technique [0002] my country's water conservancy and hydropower projects have exerted huge social and economic benefits in hydropower generation, flood control and disaster reduction, industrial and agricultural water use, shipping, aquatic products, and environmental protection tourism. Like other buildings, hydraulic concrete buildings gradually enter the "middle-aged and old age" after they are completed and put into operation. Various aging and disease problems have gradually emerged, and some have seriously affected the safe operation of the project. The repair and reinforcement of hydraulic concrete buildings has become a very prominent problem in my country's current water conservancy and hydropower projects. [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B28/06C04B14/28C04B14/06C04B16/06C04B111/74C04B111/20
CPCC04B14/062C04B14/28C04B16/0641C04B28/04C04B28/06C04B2111/20C04B2111/2015C04B2111/74C04B2201/10C04B2201/50C04B18/08C04B18/141C04B14/06C04B22/002C04B24/24C04B14/068
Inventor 陈波郭丽萍白银宁逢伟
Owner NANJING HYDRAULIC RES INST
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