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Alkali magnesium sulfate air hardening cementing material and preparation method thereof

An air-hardening glue and magnesium sulfate technology, applied in the field of basic magnesium sulfate air-hardening cementitious materials and their preparation, can solve the problems of reduced strength, slow setting and hardening, prolonged cement setting time, etc., so as to improve stability and accelerate setting. The effect of hardening and shortening the induction period

Inactive Publication Date: 2018-09-28
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has been found through practice that the setting and hardening of basic magnesium sulfate cement is slow (the final setting time is above 3h), and with the extension of the storage time of cement powder, the setting time of cement will be further extended and the early strength will be reduced.

Method used

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  • Alkali magnesium sulfate air hardening cementing material and preparation method thereof

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Effect test

Embodiment 1

[0035] A preparation method of basic magnesium sulfate air-hardening gelling material, comprising the following steps:

[0036] A, batching: after limestone and magnesite are ground (crossing 80 mesh sieves without sieving), mix uniformly and make raw meal, the content of limestone in the raw meal is 12wt%;

[0037] b. Calcination: place the raw meal at 830°C for 60 minutes and then cool it to room temperature to obtain clinker;

[0038] c. Preparation of cementitious material: take clinker, magnesium sulfate heptahydrate, and admixture in a mass ratio of 1:0.6:0.02, mix and grind to 200 mesh without sieve residue, and obtain basic magnesium sulfate air-hardening cementitious material .

[0039] The admixture is a mixture of citric acid, cellulose ether and polycarboxylate powder superplasticizer in a mass ratio of 1:1:3.

[0040] A basic magnesium sulfate air-hardening gelling material, which is prepared by the above method.

Embodiment 2

[0042] A preparation method of basic magnesium sulfate air-hardening gelling material, comprising the following steps:

[0043]a, batching: after finely grinding calcareous dolomite and magnesite (passing through 80 mesh sieve without sieve), mix uniformly to make raw meal, the content of calcareous dolomite in the raw meal is 15wt%;

[0044] b. Calcination: place the mixture at 900°C for 60 minutes and then cool to room temperature to obtain clinker;

[0045] c. Preparation of cementitious material: take clinker, magnesium sulfate heptahydrate, and admixture in a mass ratio of 1:0.5:0.01, mix and grind to 200 mesh without sieve residue, and obtain basic magnesium sulfate air-hardening cementitious material .

[0046] The admixture is a mixture of citric acid, cellulose ether and polycarboxylic acid powder superplasticizer in a mass ratio of 1:0.5:2.

[0047] A basic magnesium sulfate air-hardening gelling material, which is prepared by the above method.

Embodiment 3

[0049] A preparation method of basic magnesium sulfate air-hardening gelling material, comprising the following steps:

[0050] a, batching: the magnesia dolomite and magnesite are ground (through 80 mesh sieves without sieve residue) and mixed uniformly to obtain raw meal, the content of magnesia dolomite in the raw meal is 33wt%;

[0051] b. Calcination: place the mixture at 870°C for 150 minutes and then cool to room temperature to obtain clinker;

[0052] c. Preparation of cementitious material: take clinker, magnesium sulfate heptahydrate, and admixture in a mass ratio of 1:0.5:0.02, mix and grind to 200 mesh without sieve residue, and obtain basic magnesium sulfate air-hardening cementitious material .

[0053] The admixture is a mixture of citric acid, cellulose ether and polycarboxylic acid powder superplasticizer in a mass ratio of 1:1:2.

[0054] A basic magnesium sulfate air-hardening gelling material, which is prepared by the above method.

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Abstract

The invention discloses an alkali magnesium sulfate air hardening cementing material and a preparation method thereof. The preparation method comprises the following steps that 1, materials are prepared, wherein a calcium raw material and a magnesium raw material are crushed, ground and uniformly mixed to prepare a raw batch, and the content of the calcium raw material in the raw batch is 2-50 wt%; 2, calcining is carried out, wherein the raw batch is calcined at 700-900 DEG C for 30-150 minutes and then cooled to room temperature to prepare a clinker; 3, the cementing material is prepared, wherein the clinker, magnesium sulfate heptahydrate and an additive are mixed in the mass ratio of 1:(0.4-0.8):(0.005-0.02) and ground to obtain the alkali magnesium sulfate air hardening cementing material. The alkali magnesium sulfate air hardening cementing material prepared through the method has the advantages of being convenient to store, simple in production process, convenient to use and capable of being widely applied to production of prefabricated parts such as building blocks and wallboards and internal wall plastering materials.

Description

technical field [0001] The invention relates to a basic magnesium sulfate air-hardening gelling material and a preparation method thereof, belonging to the field of preparation methods of gelling materials in the construction industry. Background technique [0002] Basic magnesium sulfate cement is a new air-hardening magnesium cementitious material developed after magnesium oxychloride cement and magnesium oxysulfide cement. Compared with magnesium oxychloride cement, it has the following advantages: 1) It is not sensitive to high temperature, and it is especially suitable for prefabricated components that require high temperature resistance; 2) It has good reinforcement performance; 3) It has good water resistance; 4) It is not easy to absorb moisture and return halogen. Similar to magnesium oxysulfate cement, it belongs to MgO-MgSO 4 -H 2 O Ternary cementitious system, but basic magnesium sulfate cement is a kind of magnesium cementitious material with high strength, w...

Claims

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Application Information

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IPC IPC(8): C04B9/04C04B9/20
CPCC04B9/04C04B9/20
Inventor 高建明陈雪梅韩龙
Owner SOUTHEAST UNIV
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