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Nano-modified alkali-activated cementitious materials for rapid repair

A cementitious material, nano-modified technology, used in climate sustainability, sustainable waste treatment, cement production, etc., can solve problems such as high transportation costs, damage chemistry, burns, etc.

Active Publication Date: 2018-03-20
NANO & ADVANCED MATERIALS INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the presence of liquid alkali in traditional alkali-activated cement systems is a potential safety hazard that can cause serious injury (such as chemical burns) during its use
Other disadvantages of traditional alkali-activated cement systems include the inconvenience of material storage, higher transportation costs, potential leakage of alkali solution, etc.

Method used

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  • Nano-modified alkali-activated cementitious materials for rapid repair
  • Nano-modified alkali-activated cementitious materials for rapid repair
  • Nano-modified alkali-activated cementitious materials for rapid repair

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] As a starting example, according to the above steps, the OPgC gel material without nano-modifier was prepared according to the following components and samples were prepared under the following conditions.

[0067]

[0068]

[0069]

[0070] Geopolymers are generally considered to be more environmentally friendly alternative cements compared to conventional Portland cement.

[0071] The presence of liquid alkali in traditional alkali-activated cement systems is a potential safety hazard, which may cause serious injury (such as chemical burns) during its use. Other disadvantages of traditional alkali-activated cement systems include inconvenient storage of materials, higher transportation costs, potential leakage of alkali solution, etc. Therefore, the dry blended geopolymer in the form of dry powder can obtain high early mechanical strength only by adding water and stirring at the construction site. Its easy storage and transportation characteristics are the m...

Embodiment 2

[0074] According to the above steps, the nano-modified OPgC gelling material was prepared according to the following components and samples were prepared under the following conditions.

[0075] Components of OPgC

Weight (g)

slag

93-98

fly ash

3-5

Metakaolin

2-5

Feldspar

1-3

sodium hydroxide powder

2.0

Potassium Hydroxide Powder

0.2

Sodium silicate powder

5.4

Nano silica

3.2

Silica fume

0

[0076] The mixing ratio

5kg OPgC: 1.6kg water

Coagulation time (at 23±2℃)

80min

Conservation conditions

23±2℃, airtight curing

Measured early strength (24 hours)

33.8 MPa

[0077] This example gives an example of a repair material of nano-modified OPgC. The addition of nano-modifiers improved the setting time. Compared with Example 1, the coagulation time has been shortened from more than 200 minutes to 80 minutes, which is conducive...

Embodiment 3

[0083] According to the above steps, OPgC paste was prepared according to the following components and samples were prepared under the following conditions.

[0084]

[0085]

[0086]

[0087] This example gives another successful example of OPgC. The control of the amount of base activator plays an important role in OPgC. The change of ASRM components affects its reactivity, and the deployment of alkali activator has a decisive effect on the workability of the fresh mixture and the chemical reaction process during the hardening process.

[0088] Compared with Example 1, the consumption of sodium silicate powder component increases in the present embodiment, and the consumption of alkali metal hydroxide remains basically unchanged. The formulation of the base activator induces an increase in early strength, while the setting time of the mixture is significantly shortened.

[0089] Comparing Example 1 and Example 3, adjusting the consumption of ASRM components and al...

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Abstract

A nano-modified dry-mixed alkali-activated cementitious, or one-part geopolymer cement (OPgC), material with high early strength is provided for rapid repair of cement-based infrastructure components.The OPgC may include an aluminosilicate rich material, an alkali material and a nano-modifier, and optionally include other functional admixtures and fibers. The OPgC can be freshly mixed with waterto obtain a repairing material. The OPgC may mix with water and fine or coarse aggregate to form mortar or concrete. The OPgC can be an alternative binding matrix for the development of an environmentally friendly and cost effective rapid repair material and can replace conventional adhesive matrix (including Portland cement, organic adhesives, etc.).

Description

technical field [0001] The present application relates to materials based on alkali activated gelling materials or geopolymers. More specifically, the present application provides a nano-modified dry-mix alkali-activated cementitious material with high early strength for rapid repair of cement-based building facilities. Background technique [0002] The maintenance work of cement-based building facilities can be broadly divided into emergency / temporary repairs and scheduled maintenance. Repair work includes the repair of concrete infrastructure such as sidewalks, sewer systems, buildings, and bridges. Under the background of high traffic flow demand, serious land shortage and growing social demand in modern cities, all lane repair work needs to be completed within a few hours to a few days at most, and the construction time is very limited. On the other hand, modern cities have complex sewer systems, which are usually built between a large number of infrastructures, so the...

Claims

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Application Information

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IPC IPC(8): C04B7/153C04B7/24C04B12/00
CPCC04B7/1535C04B7/243C04B12/005C04B28/006C04B28/008C04B28/26C04B28/08C04B2111/72Y02P40/10Y02W30/91C04B14/043C04B14/06C04B14/106C04B14/12C04B14/303C04B16/0633C04B16/0641C04B16/0691C04B18/08C04B18/106C04B18/141C04B18/142C04B18/145C04B18/146C04B20/008C04B2103/0088C04B22/064C04B22/06C04B22/062
Inventor 周颂刚关西文张濒予沈文龙
Owner NANO & ADVANCED MATERIALS INST
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