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Phosphate base cementing agent

A technology of phosphate and cementitious materials, applied in the field of building materials and phosphate-based cementitious materials, can solve the problems of poor workability and short setting time.

Inactive Publication Date: 2012-08-01
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to prepare a phosphate cementitious slurry with excellent working performance and solve the technical problems of too short setting time and poor workability in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] [Example 1]: The phosphate-based cementitious slurry of the present invention is uniformly mixed with a phosphate cement mixture and water, and the materials and mass percentages are: 65%-75% of the phosphate cement mixture and 25%-35% of water; The phosphate cement mixture is composed of dihydrogen phosphate, magnesia, inorganic mineral filler, retarder, and a small amount of sand can also be added. Powdery and granular dihydrogen phosphate can be used. When granular materials are used, the particle size is ≤2.0mm, and the effective substance content in phosphate is ≥98%. Fused magnesia, one of seawater magnesia or their combination, the content of magnesia in magnesia is 80% to 95%, and the fineness is 5% to 40% of the 45 micron square hole sieve; fly ash It is low-calcium ash, the fineness of which is 5% to 40% sieved by a 45-micron square hole sieve, and the fineness of wollastonite is 5% to 40% sieved by a 45-micron square-hole sieve. The setting retarder is sod...

Embodiment 2

[0018] [Example 2]: Prepare the phosphate cement mixture according to the following material mass ratio, 27% of dead-burned magnesia, 46% of potassium dihydrogen phosphate, 27% of fly ash, and 10% of borax in dead-burned magnesia. Accurately weigh the material and mix evenly in the mixing pot, then add water according to the water-to-cement ratio of 30% and mix to form a slurry. The initial setting time of the slurry was determined to be 30 minutes, and the extended fluidity was 190 mm.

Embodiment 3

[0019] [Example 3] : Prepare the phosphate cement mixture according to the following material mass ratio, 30% of dead-burned magnesia, 20% of potassium dihydrogen phosphate, 30% of fly ash, and 10% of borax in dead-burned magnesia. Accurately weigh the material and mix it evenly in the mixing pot, then add water according to the water-to-cement ratio of 30% and mix it into a slurry. The initial setting time of the slurry was determined to be 30 minutes, and the extended fluidity was 200mm.

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Abstract

The invention discloses phosphate base cementing agent which is formed by uniformly mixing phosphate cementing mixture and water. The phosphate cementing mixture comprises the following component according to mass percent: 65 to 80 percent of phosphate cementing mixture and 20 to 35 percent of water; the phosphate cementing mixture comprises the following components according to mass percent: 20 to 60 percent of dihydric phosphate, 20 to 40 percent of magnesite, and 0 to 40 percent of inorganic mineral filler, wherein the mass of retarder occupies 5 to 15 percent of that of the magnesite; and the mass of sand occupies 0 to 30 percent of that of the phosphate cementing mixture. Phosphate gelling slurry can be served as structural adhesive to prepare fibrous composite material for concrete reinforcement, to improve the compatibility between the phosphate gelling slurry and concrete, and can also be served as gelling material to prepare artificial composite board material, self-leveling slurry, protective paint and the like.

Description

technical field [0001] The invention relates to building materials in the technical field of building engineering, in particular to a phosphate-based cementing material. Background technique [0002] Magnesium phosphate cementitious material has superior properties, such as fast drying and early strength, long-term stability and high mechanical properties; it can be hydrated and hardened at low temperature, and can develop strength under negative temperature conditions; it has good bonding properties with other materials ; It has good density and acid and alkali corrosion resistance, dry shrinkage, good wear resistance and frost resistance. After hardening, the magnesium phosphate cementitious material has the characteristics of certain ceramic products, also known as chemically bonded ceramics. But unlike sintered ceramic products, it is also different from the material formed by hydration and hardening of ordinary Portland cement. It is a material in between, which can me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B12/02
Inventor 丁铸
Owner SHENZHEN UNIV
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