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A kind of phosphate cement retarder and using method thereof

A phosphate cement and retarder technology, which is applied in the field of phosphate cement retarders, can solve the problems of affecting structural safety, adverse effects on later strength and water resistance, and greater influence on the strength of phosphate cement, so as to prolong the setting Time, the effect of meeting the requirements of construction operability

Active Publication Date: 2020-10-02
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the use effect of above-mentioned retarder is not very ideal, there are some problems, as: retardation effect is not obvious when the amount of borate is little, when the amount is many, there is adverse effect on the later stage strength and water resistance of MPC; : The strength of phosphate cement is greatly affected by the addition of chlorine salt, and due to the presence of chloride ions, if used in a structure with steel bars, it will cause steel bars to corrode and affect structural safety.

Method used

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  • A kind of phosphate cement retarder and using method thereof
  • A kind of phosphate cement retarder and using method thereof
  • A kind of phosphate cement retarder and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A phosphate cement retarder, the retarder comprises the following components according to mass percentage:

[0029] Iron Sulfate Dodecahydrate 95%

[0030] Sodium Sulfate Decahydrate 4%

[0031] Trisodium Phosphate Dodecahydrate 1%.

[0032] in:

[0033] The phosphate cement retarder is in powder form, and the particle size of the powder is 20-200 μm.

[0034] Sodium sulfate decahydrate is a colorless monoclinic crystalline powder with a purity of ≥98.0wt%.

[0035] The iron sulfate dodecahydrate is lavender octahedral crystal powder with a purity of ≥99.0wt%.

[0036] Trisodium phosphate dodecahydrate is a colorless or white crystalline powder with a purity of ≥99.0wt%.

[0037] A kind of using method of phosphate cement retarder, comprises the following steps:

[0038] 1) uniformly mixing ferric sulfate dodecahydrate, sodium sulfate decahydrate, and trisodium phosphate dodecahydrate in proportion to obtain a phosphate cement retarder;

[0039] 2) Add phosphate ...

Embodiment 2

[0045] A phosphate cement retarder, the retarder comprises the following components according to mass percentage:

[0046] Iron Sulfate Dodecahydrate 80%

[0047] Sodium Sulfate Decahydrate 10%

[0048] Trisodium Phosphate Dodecahydrate 10%.

[0049] in:

[0050] The phosphate cement retarder is in powder form, and the particle size of the powder is 20-200 μm.

[0051] Sodium sulfate decahydrate is a colorless monoclinic crystalline powder with a purity of ≥98.0wt%.

[0052] The iron sulfate dodecahydrate is lavender octahedral crystal powder with a purity of ≥99.0wt%.

[0053] Trisodium phosphate dodecahydrate is a colorless or white crystalline powder with a purity of ≥99.0wt%.

[0054] A kind of using method of phosphate cement retarder, comprises the following steps:

[0055] 1) uniformly mixing iron sulfate dodecahydrate, sodium sulfate decahydrate, and trisodium phosphate dodecahydrate in proportion to obtain a phosphate cement retarder;

[0056] 2) Add phosphate ...

Embodiment 3

[0063] A phosphate cement retarder, the retarder comprises the following components according to mass percentage:

[0064] Iron Sulfate Dodecahydrate 90%

[0065] Sodium Sulfate Decahydrate 5%

[0066] Trisodium Phosphate Dodecahydrate 5%.

[0067] in:

[0068] The phosphate cement retarder is in powder form, and the particle size of the powder is 20-200 μm.

[0069] Sodium sulfate decahydrate is a colorless monoclinic crystalline powder with a purity of ≥98.0%wt%.

[0070] The dodecahydrate ferric sulfate is a lavender octahedral crystal powder, and its purity is ≥99.0%wt%.

[0071] Trisodium phosphate dodecahydrate is a colorless or white crystalline powder with a purity of ≥99.0%wt%.

[0072] A kind of using method of phosphate cement retarder, comprises the following steps:

[0073] 1) uniformly mixing ferric sulfate dodecahydrate, sodium sulfate decahydrate, and trisodium phosphate dodecahydrate in proportion to obtain a phosphate cement retarder;

[0074] 2) Add pho...

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Abstract

The invention discloses a phosphate cement retarder and a use method thereof. The retarder is prepared from the following components in percentage by mass: 80 to 95 percent of ferrite sulfate dodecahydrate, 1 to 10 percent of sodium sulfate decahydrate and 1 to 10 percent of trisodium phosphate dodecahydrate, wherein the sum of the components is 100 percent. A preparation method of the phosphate cement retarder comprises the following steps: firstly, uniformly mixing the ferrite sulfate dodecahydrate, the sodium sulfate decahydrate and the trisodium phosphate dodecahydrate according to proportions to obtain the phosphate cement retarder; secondly, doping the phosphate cement retarder into phosphate cement, uniformly mixing and adding water for later use. The phosphate cement retarder provided by the invention has the advantages that the condensation time can be effectively prolonged by 14 to 60 minutes and gradual loss of phosphate slurry fluidity can be reduced; the influence on earlycompressive strength is less and the requirements of construction operability are met.

Description

technical field [0001] The invention relates to a phosphate cement retarder and a using method thereof, belonging to the technical field of phosphate cement admixtures. Background technique [0002] Phosphate cement (MPC) is prepared by burning magnesia, phosphoric acid or acid phosphate and setting material in a certain proportion. Magnesium phosphate cement reacts with water to obtain a material with a highly crystalline structure, which is why it is also known as "chemically bonded magnesium phosphate ceramic". MPC has the following technical performance characteristics: rapid solidification and hardening, high early strength, solidification and hardening in a low temperature environment of 20±5°C, strong bonding ability, and excellent durability. In the 1980s, the United States and other western countries took advantage of the characteristics of rapid hardening and high strength of magnesium phosphate cement, and used it in large quantities for the repair and emergency ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/16C04B12/02C04B103/22
CPCC04B12/025C04B40/0039C04B2103/22C04B22/149C04B22/147C04B22/16
Inventor 钱春香戴俊
Owner SOUTHEAST UNIV