Chlorine ion curing agent for reinforced concrete and preparation method and applications thereof

A technology of reinforced concrete and curing agent, which is applied in the field of chloride ion curing agent for reinforced concrete and its preparation, can solve the problems of high cost of replacing steel bars, high desorption rate, poor adhesion and toughness, etc. stability, complete crystal structure, and the effect of reducing stress concentration

A technology of reinforced concrete and curing agent, which is applied in the field of chloride ion curing agent for reinforced concrete and its preparation, can solve the problems of high cost of replacing steel bars, high desorption rate, poor adhesion and toughness, etc. stability, complete crystal structure, and the effect of reducing stress concentration

CN110803880AActive Publication Date: 2020-02-18UNIV OF JINAN
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  • Chlorine ion curing agent for reinforced concrete and preparation method and applications thereof
  • Chlorine ion curing agent for reinforced concrete and preparation method and applications thereof
  • Chlorine ion curing agent for reinforced concrete and preparation method and applications thereof

Examples

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Effect test

Embodiment 1

[0041] A preparation method of a chloride ion curing agent for reinforced concrete, comprising the steps of:

[0042] 1. CaFe-NO 3 Synthesis and preparation of LDHs: Dissolve 10mmol of calcium nitrate and 5mmol of ferric nitrate in 100mL of distilled water to make solution A; add solution A dropwise into 30mL of 1mol / L sodium hydroxide solution (air flow rate is 100ml / min Nitrogen protection), magnetic stirring for 36 hours after the titration is completed, then filtered to neutral, dried in a vacuum oven at 80°C for 12 hours, and the obtained product was ground into powder to obtain the final product.

[0043] 2. CaFeAl-NO 3 Synthesis and preparation of LDHs: Dissolve 100mmol of calcium nitrate, 10mmol of iron nitrate, and 40mmol of aluminum nitrate in 100mL of distilled water to prepare solution B; dissolve 240mmol of sodium hydroxide and 120mmol of sodium nitrate in 100mL of distilled water to prepare C solution; add B solution and C solution dropwise into a three-necke...

Embodiment 2

[0045] A preparation method of a chloride ion curing agent for reinforced concrete, comprising the steps of:

[0046] 1. CaFe-NO 3 Synthesis and preparation of LDHs: Dissolve 40mmol of calcium nitrate and 15mmol of ferric nitrate in 100mL of distilled water to make solution A; add solution A dropwise to 100mL of 1mol / L sodium hydroxide solution (air flow rate is 100ml / min Nitrogen protection), magnetic stirring for 12 hours after the titration, then filtering to neutrality, drying in a vacuum oven at 60°C for 24 hours, and grinding the obtained product into powder to obtain the final product.

[0047] 2. CaFeAl-NO 3 Synthesis and preparation of LDHs: Dissolve 30mmol of calcium nitrate, 5mmol of iron nitrate, and 10mmol of aluminum nitrate in 120mL of distilled water to prepare solution B; dissolve 80mmol of sodium hydroxide and 100mmol of sodium nitrate in 120mL of distilled water to prepare C solution; add B solution and C solution dropwise into a three-necked flask at th...

Embodiment 3

[0049] A preparation method of a chloride ion curing agent for reinforced concrete, comprising the steps of:

[0050] 1. CaFeL-NO 3 Synthesis and preparation of DHs: Dissolve 50mmol of calcium nitrate and 25mmol of ferric nitrate in 120mL of distilled water to form solution A; add solution A dropwise into 140mL of 1mol / L sodium hydroxide solution (air flow rate is 100ml / min Nitrogen protection), magnetically stirred for 48 hours after the titration, filtered until neutral, dried in a vacuum oven at 120°C for 6 hours, and ground the obtained product into powder.

[0051] 2. CaFeAl-NO 3 Synthesis and preparation of LDHs: Dissolve 150mmol of calcium nitrate, 20mmol of iron nitrate, and 50mmol of aluminum nitrate in 150mL of distilled water to prepare solution B; dissolve 300mmol of sodium hydroxide and 200mmol of sodium nitrate in 150mL of distilled water to prepare C solution; add B solution and C solution dropwise into a three-necked flask at the same time, stir for 2 hours...

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Abstract

The invention belongs to the technical field of chlorine ion curing agents, and especially relates to a chlorine ion curing agent for reinforced concrete and a preparation method and applications thereof. The curing agent is metal dihydroxide with a layered structure, has a micro-nano level granular shape, and is prepared by compounding 50 to 80 parts by weight of CaFe-NO3LDHs and 20 to 50 parts by weight of CaFeAl-NO3LDHs. The prepared chlorine ion curing agent does not damage a cement based material, and can stably and efficiently adsorb chlorine ions in a simulated concrete hole solution. In a cement paste sample, which has been soaked in a sodium chloride solution (3.5%), the corrosive performance of chlorine ions is obviously reduced, the effect is excellent, and the provided chlorineion curing agent is efficient and stable.

Description

technical field [0001] The invention belongs to the technical field of chloride ion curing agents, in particular to a chloride ion curing agent for reinforced concrete and its preparation method and application. Background technique [0002] The information disclosed in the Background of the Invention is only intended to increase the understanding of the general background of the invention, and is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes the prior art that is already known to those skilled in the art. [0003] Free chloride ions (Cl - ) is easy to cause deterioration of reinforced concrete structure and performance, endangering the safety, reliability and service life of the project. This is mainly manifested as: when chloride ions enter the concrete, it will promote the electrochemical corrosion of steel bars (anode: Fe→Fe 2+ +2e - ; Cathode: O 2 +2H 2 O+4e - →4OH - ). When the corrosion of steel bar...

Claims

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Application Information

Patent Timeline
18 Feb 2020
Publication
CN110803880A
IPC
C04B22/08
CPC
C04B22/085; C04B40/0042
Inventors
芦令超; 杨磊