Basic magnesium sulfate cement and preparation method thereof

A magnesium sulfate, basic technology, applied in the field of building materials, can solve the problems of prolonging the setting time, unable to speed up the setting rate of basic magnesium sulfate cement system, slow product hardening, etc., to improve the setting and hardening speed, reduce the risk of cracking, early high intensity effect

Inactive Publication Date: 2021-03-16
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the late strength of basic magnesium sulfate cement is higher, based on the retarding effect of the admixture, the product hardens slowly. The final setting time at room temperature generally exceeds 6 hours, and its 1-day strength is also much lower than that of magnesium oxychloride cement. Many, which pose very difficult problems for the production efficiency and scale produc...

Method used

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  • Basic magnesium sulfate cement and preparation method thereof
  • Basic magnesium sulfate cement and preparation method thereof
  • Basic magnesium sulfate cement and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The present embodiment provides a kind of preparation of basic magnesium sulfate cement:

[0025] The preparation of magnesium oxysulfide crystal nucleating agent:

[0026] Mix 100 parts of light-burned magnesite powder with active MgO mass fraction of 55%, 0.05 part of phosphoric acid and 143 parts of magnesium sulfate solution with a mass fraction of 20%; Cure for 28 days at ℃ to accelerate hardening. Finally, the hardened sample is ground into powder by ball milling to obtain the magnesium oxysulfide crystal nucleating agent, the main composition of which is Mg(OH) 2 · MgSO 4 ·5H 2 O(1.1.5).

[0027] Preparation of basic magnesium sulfate cement:

[0028] 100 parts of active magnesium oxide powder with a mass fraction of 55% of active MgO, 0.01 part of potassium dihydrogen phosphate, and 1 part of 1.1.5 magnesium oxysulfide crystal nucleating agent are mixed and ground and passed through a 100-mesh sieve, and 100 parts of 20wt% The magnesium sulfate heptahydrat...

Embodiment 2

[0030] The present embodiment provides a kind of preparation of basic magnesium sulfate cement:

[0031] The preparation of magnesium oxysulfide crystal nucleating agent:

[0032] 100 parts of light-burned magnesite powder with active MgO mass fraction of 62%, 0.05 part of phosphoric acid and 106.2 parts of magnesium sulfate solution with mass fraction of 20% were mixed; Cure for 28 days at ℃ to accelerate hardening. Finally, the hardened sample is ground into powder by ball milling to obtain a magnesium oxysulfide crystal nucleating agent, the main composition of which is 2Mg(OH) 2 · MgSO 4 ·3H 2 O(2 1 3).

[0033] Preparation of basic magnesium sulfate cement:

[0034] 100 parts of active magnesium oxide powder with a mass fraction of 75% of active MgO, 0.03 parts of sodium dihydrogen phosphate, and 3 parts of 2.1.3 magnesium oxysulfide crystal nucleating agent were mixed and ground and passed through a 100-mesh sieve, and 94 parts of 20wt% The magnesium sulfate pentah...

Embodiment 3

[0036] The present embodiment provides a kind of preparation of basic magnesium sulfate cement:

[0037] The preparation of magnesium oxysulfide crystal nucleating agent:

[0038] Mix 100 parts of light-burned magnesite powder with an active MgO mass fraction of 68%, 0.05 parts of phosphoric acid and 300 parts of a 20% magnesium sulfate solution; Cure for 28 days at ℃ to accelerate hardening. Finally, the hardened sample is ground into powder by ball milling to obtain a magnesium oxysulfide crystal nucleating agent, the main composition of which is 3Mg(OH) 2 · MgSO 4 ·8H 2 O(3 1 8).

[0039] Preparation of basic magnesium sulfate cement:

[0040] 100 parts of active MgO mass fractions are 64% active magnesium oxide powder, 0.05 parts of ammonium dihydrogen phosphate, 5 parts of 3.1.8 magnesium sulfate crystal nucleating agent are mixed and ground and passed through a 100 mesh sieve, and 73 parts of 20wt% The magnesium sulfate trihydrate solution is mixed and hardened to ...

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Abstract

The invention discloses basic magnesium sulfate cement which comprises the following components in parts by mass: 100 parts of active magnesium oxide powder, 30-100 parts of a magnesium sulfate solution, 0.01-0.05 part of an additive and 0.1-5 parts of a magnesium oxysulfate crystal nucleating agent, the magnesium sulfate solution is an aqueous solution of crystallized magnesium sulfate, and the mass fraction of the magnesium sulfate solution is 15-20%; the magnesium oxysulfate crystal nucleating agent is prepared by the following method: step 1, mixing 50-100 parts by mass of light calcined magnesite powder with the active MgO mass fraction of 55%-85%, 70-300 parts by mass of a magnesium sulfate solution with the active MgO mass fraction of 10%-25% and 0.01-0.05 part by mass of phosphoricacid; and 2, putting the paste obtained in the step 1 into a sealed bag, curing at 20+/-3 DEG C for 28 days to promote hardening, and finally grinding the hardened sample into powder through ball milling to obtain the actual magnesium oxysulfide crystal nucleating agent. The basic magnesium sulfate cement has the advantages of short setting time, early strength, high strength and the like.

Description

technical field [0001] The invention belongs to the field of building materials, and relates to cement, in particular to basic magnesium sulfate cement and a preparation method thereof. Background technique [0002] MgO-MgSO 4 -H 2 O cement is an inorganic gelling material formed by mixing magnesium oxide and magnesium sulfate solution and adding certain admixtures. It belongs to an air-hardening magnesium material, and its main hydration product is 3Mg(OH) 2 · MgSO 4 ·8H 2 O (referred to as 3.1.8). Currently for MgO-MgSO 4 -H 2 O The modification technology of the ternary gelling system mostly uses organic carboxylic acid and other retarders to obtain a basic magnesium sulfate cement with excellent performance, and its main hydration product is 5Mg(OH) 2 · MgSO 4 ·7H 2 O (referred to as 5.1.7). The addition of these admixtures improves the strength and volume stability of basic magnesium sulfate cement by changing the composition of its hydration phase. Although ...

Claims

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Application Information

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IPC IPC(8): C04B9/04
CPCC04B9/04
Inventor 余红发吴成友宗京平罗轲嘉巩旭寇西湖麻海燕
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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