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A kind of magnesium phosphate cement with good water resistance and its application method

A magnesium phosphate cement, high-performance technology, applied in the field of building materials, can solve the problem of low overall utilization rate

Inactive Publication Date: 2018-07-03
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Many scholars in China have applied finely ground steel slag powder to building materials. There are three main ways to use steel slag powder in cement production: as a raw meal component mixed with fired cement clinker; as a clinker substitute to produce Clinker-less or clinker-free steel slag cement; as an active admixture for cement and concrete, but the overall utilization rate is not high, only 50%-60%

Method used

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  • A kind of magnesium phosphate cement with good water resistance and its application method

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Experimental program
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Effect test

Embodiment 1

[0042]Embodiment 1, a kind of magnesium phosphate cement with good water resistance performance, according to overburned magnesium oxide 100, potassium dihydrogen phosphate 31.8, coagulation regulator 2, desulfurization gypsum 6.0, fly ash 45, steel slag powder 20, limestone powder 0, reduce The weight ratio of water agent 0.15 and defoamer 0.10 is prepared. According to the water-cement ratio of 0.30, add water and stir evenly before forming. The performance test results are shown in Table 1.

Embodiment 2

[0043] Embodiment 2, a kind of magnesium phosphate cement with good water resistance performance, according to overburned magnesium oxide 100, potassium dihydrogen phosphate 15.8, coagulation regulator 12, desulfurization gypsum 4.0, fly ash 20, steel slag powder 10, limestone powder 8.0, reduce The weight ratio of water agent 0.25 and defoamer 0.30 is prepared. According to the water-cement ratio of 0.30, add water and stir evenly before forming. The performance test results are shown in Table 1.

Embodiment 3

[0044] Embodiment 3, a kind of magnesium phosphate cement with good water resistance performance, according to overburned magnesium oxide 100, potassium dihydrogen phosphate 23.8, coagulation regulator 5, desulfurization gypsum 5.0, fly ash 30, steel slag powder 10.5, limestone powder 7.1, reduce The water agent is 0.22, and the weight ratio of the defoamer is 0.15. According to the water-cement ratio of 0.30, add water and stir evenly before forming. The performance test results are shown in Table 1.

[0045] Table 1 Example performance test results

[0046]

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Abstract

The invention belongs to the technical field of building materials, and particularly relates to preparation of magnesium phosphate cement with good hydrolytic resistance and a using method thereof. The magnesium phosphate cement is prepared from calcined magnesia, monopotassium phosphate, retarder, desulphurization gypsum, coal ash, steel slag powder, limestone flour, a water reducing agent and a defoaming agent. The defects that traditional magnesium phosphate cement is insufficient in early strength, low in later strength, poor in water resistance, high in cost and the like can be overcome, and the additional value of the industrial byproducts such as the coal ash, the steel slag powder and the desulphurization gypsum can be improved. The magnesium phosphate cement with good hydrolytic resistance can be used as a rapid repair material, has the excellent properties that preparation technology is simple, fluidity is good, early strength development is fast, later strength is not reduced and permeability and erosion resistance is good, is applicable to rapid repair engineering of bridges, wharfs, municipal engineering and the like, and has good economic benefits and social benefits.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a magnesium phosphate cement with good water resistance and a using method thereof. Background technique [0002] Magnesium phosphate cement (MPC) is generally used in areas that are not in contact with water for a long time, but as a quick repair material for road surfaces, if it is in a humid or rainy area, it will inevitably have an adverse effect on its durability. limit its wide application. There have been many studies on the water resistance and modification of magnesium oxychloride cement at home and abroad, but there are relatively few studies on magnesium phosphate cement, which is also a magnesium cementitious material. Therefore, the present invention has certain practical significance for the research on the improvement of the water resistance of magnesium phosphate cement. [0003] Fly ash and steel slag are both solid wastes. If they are di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B12/02C04B28/34
CPCC04B12/025C04B28/344
Inventor 孙振平张世杰水亮亮郭二飞蒋晓星唐晓博
Owner TONGJI UNIV
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