Retarder-free waterproof magnesium ammonium phosphate cement and preparation method thereof

A magnesium ammonium phosphate cement and water resistance technology, which is applied in the field of civil engineering materials, can solve the problems of reducing the strength of MPC materials and the improvement effect of the water resistance of MPC materials is limited, and achieves the effects of reducing porosity, prolonging setting time and reducing costs.

Active Publication Date: 2017-05-31
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods generally reduce the strength of the MPC material, and have a limited effect on improving the water resistance of the MPC material.

Method used

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  • Retarder-free waterproof magnesium ammonium phosphate cement and preparation method thereof
  • Retarder-free waterproof magnesium ammonium phosphate cement and preparation method thereof
  • Retarder-free waterproof magnesium ammonium phosphate cement and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032]1. Preparation of graphene oxide-coated dead-burned magnesia: Dissolve graphene oxide powder in absolute ethanol, and use an ultrasonic cleaner to sonicate for 40-60 minutes to obtain a uniformly dispersed graphene oxide solution. Put the graphene oxide solution into a three-necked flask, and under the condition of continuous stirring (300r / min), add the deadened magnesium oxide powder in 5 to 8 times, and add all the deadened magnesium oxide powder and graphene oxide within 30 minutes. The mass ratio is 100:60 in turn. After the addition, keep the water bath at a constant temperature of 65°C for 12 hours. During the reaction, add absolute ethanol to the three-necked flask continuously so that the content of absolute ethanol meets the mass ratio of graphene oxide to 100:1. After the reaction, the reaction solution is dried in a freeze dryer to obtain graphene oxide-coated dead-burned magnesium oxide.

[0033] 2. Preparation of magnesium ammonium phosphate cement: take g...

Embodiment 2

[0035] 1. Preparation of graphene oxide-coated dead-burned magnesia: Dissolve graphene oxide powder in absolute ethanol, and use an ultrasonic cleaner to sonicate for 40-60 minutes to obtain a uniformly dispersed graphene oxide solution. Put the graphene oxide solution into a three-necked flask, and under the condition of continuous stirring (300r / min), add the deadened magnesium oxide powder in 5 to 8 times, and add all the deadened magnesium oxide powder and graphene oxide within 30 minutes. The mass ratio is 100:80 in turn. After the addition, keep the water bath at a constant temperature of 65°C for 12 hours. During the reaction, add absolute ethanol to the three-necked flask continuously so that the content of absolute ethanol meets the mass ratio of graphene oxide to 100:1. After the reaction, the reaction solution is dried in a freeze dryer to obtain graphene oxide-coated dead-burned magnesium oxide.

[0036] 2. Preparation of magnesium ammonium phosphate cement: take ...

Embodiment 3

[0038] 1. Preparation of graphene oxide-coated dead-burned magnesia: Dissolve graphene oxide powder in absolute ethanol, and use an ultrasonic cleaner to sonicate for 40-60 minutes to obtain a uniformly dispersed graphene oxide solution. Put the graphene oxide solution into a three-necked flask, and under the condition of continuous stirring (300r / min), add the deadened magnesium oxide powder in 5 to 8 times, and add all the deadened magnesium oxide powder and graphene oxide within 30 minutes. The mass ratio is 100:50 in turn. After the addition, keep the water bath at a constant temperature of 65°C for 12 hours. During the reaction, add absolute ethanol to the three-necked flask continuously so that the content of absolute ethanol meets the mass ratio of graphene oxide to 100:1. After the reaction, the reaction solution is dried in a freeze dryer to obtain graphene oxide-coated dead-burned magnesium oxide.

[0039] 2. Preparation of magnesium ammonium phosphate cement: take ...

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Abstract

The invention discloses retarder-free waterproof magnesium ammonium phosphate cement and a preparation method thereof. The cement comprises dead burned magnesia coated with graphene oxide, ammonium dihydrogen phosphate and mineral admixtures, wherein the mass ratio of dead burned magnesia coated with graphene oxide and ammonium dihydrogen phosphate is (62-78):(22-38), and the mineral admixtures are 5-15% of the total mass of dead burned magnesia and ammonium dihydrogen phosphate. According to the cement, dead burned magnesia powder is pretreated by graphene oxide, so that a comparatively obvious isolation effect is formed between magnesia and an external environment, therefore, the dissolution rate of magnesia is greatly decreased, a forming process of a hydration product is delayed, and the heat release of a whole reaction system is reduced; macroscopically, the time of coagulation is greatly prolonged, and any retarders do not need to be added. Moreover, a dissolution process of the hydration product and phosphate is inhibited, a large amount of pores are prevented from being formed in the cement, and the strength of hardened cement paste is ensured.

Description

technical field [0001] The invention relates to a water-resistant magnesium ammonium phosphate cement without a retarder and a preparation method thereof, belonging to the technical field of civil engineering materials. Background technique [0002] Magnesium phosphate cement (MPC for short) is prepared by reburning magnesium oxide powder, soluble phosphate, retarder and mineral admixture in a certain proportion. It is a kind of chemical bond formed by chemical reaction to produce strength The cementitious materials, which have performance characteristics similar to those of ceramics, have received more and more attention as a new type of cementitious materials. Compared with traditional Portland cement, MPC has many special properties: first, it presents an approximately neutral environment after setting and hardening; second, the setting and hardening time is very short; third, it has very high strength and compactness after setting and hardening ; Fourth, it has excellen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B12/02
CPCC04B12/025
Inventor 叶正茂景国建王振兴
Owner UNIV OF JINAN
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