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CN-122010522-A - Magnesium phosphate-based rapid hardening repair material and application method thereof

CN122010522ACN 122010522 ACN122010522 ACN 122010522ACN-122010522-A

Abstract

The invention belongs to the field of building materials, and particularly relates to a magnesium phosphate-based rapid hardening repair material and a use method thereof. The magnesium phosphate-based rapid hardening repair material comprises 24 mass percent (43-72) of phosphate, 3-15 mass percent (3-15) of magnesium oxide, 3-5 mass percent of slag, retarder and alkali activator, wherein the alkali activator is sodium silicate or a mixture of sodium silicate and sodium hydroxide, the molar ratio of silicon content calculated by SiO 2 in the alkali activator to sodium content calculated by Na 2 O is less than or equal to 1.5:1, and the dosage of the alkali activator is 2-10wt% of the total mass of the steel slag and the slag. The magnesium phosphate-based rapid hardening repair material provided by the invention has high solid waste content and higher strength and water resistance after construction is completed.

Inventors

  • WANG GUOQING
  • LI ZHENG
  • WANG MINGZE

Assignees

  • 海南大学

Dates

Publication Date
20260512
Application Date
20260212

Claims (10)

  1. 1. The magnesium phosphate-based rapid hardening repair material is characterized by comprising 24-72 of (43-15) of (3-15) of (2-5) of (3-15) of (3-5) of (3-15) phosphate, or a mixture of sodium silicate and sodium hydroxide, wherein the molar ratio of silicon content calculated by SiO 2 to sodium content calculated by Na 2 O in the alkaline activator is less than or equal to 1.5:1, and the alkaline activator is used in an amount of 2-10wt% of the total mass of the steel slag and the slag.
  2. 2. A magnesium phosphate-based rapid hardening repair material according to claim 1, wherein the phosphate is potassium dihydrogen phosphate and/or ammonium dihydrogen phosphate.
  3. 3. The magnesium phosphate-based rapid hardening repair material according to claim 1, wherein the particle size of the phosphate is 0.6-1.2 mm.
  4. 4. The magnesium phosphate-based rapid hardening repair material according to claim 1, wherein the magnesium oxide is a dead-burned magnesium oxide.
  5. 5. The rapid hardening repair material based on magnesium phosphate according to claim 1, wherein the steel slag has a D 50 particle size of 15-20 μm and a specific surface area of 300-400 m 2 /kg.
  6. 6. The magnesium phosphate-based rapid hardening repair material according to claim 1, wherein the slag has a D 50 particle size of 10 to 15 μm and a specific surface area of 400 to 500m 2 /kg.
  7. 7. The magnesium phosphate-based rapid hardening repair material according to claim 1, wherein the retarder is borax.
  8. 8. The magnesium phosphate-based rapid hardening repair material according to claim 1, wherein the molar ratio of the silicon content in terms of SiO 2 to the sodium content in terms of Na 2 O in the alkaline activator is 1.3:1.
  9. 9. A method of using the magnesium phosphate-based rapid hardening repair material according to any one of claims 1 to 8, comprising the steps of: And mixing the magnesium phosphate-based rapid hardening repair material with water, and then performing construction and maintenance.
  10. 10. The method of claim 9, wherein the mass ratio of magnesium phosphate based rapid hardening repair material to water is 1 (0.1-0.2).

Description

Magnesium phosphate-based rapid hardening repair material and application method thereof Technical Field The invention belongs to the field of building materials, and particularly relates to a magnesium phosphate-based rapid hardening repair material and a use method thereof. Background Concrete structures such as roads, bridges, tunnels and the like generally face early damage and functional degradation problems under the action of multiple factors such as extreme climate events or geological disasters (such as freeze thawing cycles, landslide) and overload operation. Therefore, the development of high performance concrete rapid hardening repair materials has become a key topic for guaranteeing the durability of infrastructure. The ideal rapid hardening repair material needs to meet the multi-dimensional performance requirements of controllable setting time and good fluidity in the aspect of construction performance, and needs to realize rapid development of early strength and long-term strength stability in the aspect of mechanical performance. The magnesium phosphate-based material is a common concrete rapid hardening repair material at present, but the traditional magnesium phosphate-based material has the problem of poor water resistance. In addition, in order to reduce the production cost of the concrete rapid hardening repair material, some solid waste materials such as steel slag, slag and the like are often mixed in the raw materials, but the mixing amount is often lower in order to avoid adverse effects on the performance of the concrete rapid hardening repair material because the activity of the solid waste materials is lower. Disclosure of Invention In view of the above, the present invention aims to provide a magnesium phosphate-based rapid hardening repair material and a method for using the same, wherein the magnesium phosphate-based rapid hardening repair material has high solid waste content, and has high strength and water resistance after construction. The invention provides a magnesium phosphate-based rapid hardening repair material which comprises 24 mass percent (43-72 mass percent) (3-15 mass percent) (2-5 mass percent) of phosphate, magnesium oxide, steel slag, retarder and alkaline activator, wherein the alkaline activator is sodium silicate or a mixture of sodium silicate and sodium hydroxide, the molar ratio of silicon content calculated by SiO 2 in the alkaline activator to sodium content calculated by Na 2 O is less than or equal to 1.5:1, and the use amount of the alkaline activator is 2-10wt% of the total mass of the steel slag and the slag. Preferably, the phosphate is potassium dihydrogen phosphate and/or ammonium dihydrogen phosphate. Preferably, the particle size of the phosphate is 0.6-1.2 mm. Preferably, the magnesium oxide is a dead burned magnesium oxide. Preferably, the D 50 particle size of the steel slag is 15-20 mu m, and the specific surface area is 300-400 m 2/kg. Preferably, the D 50 particle size of the slag is 10-15 mu m, and the specific surface area is 400-500 m 2/kg. Preferably, the retarder is borax. Preferably, the molar ratio of the silicon content in terms of SiO 2 to the sodium content in terms of Na 2 O in the alkaline activator is 1.3:1. The invention provides a use method of the magnesium phosphate-based rapid hardening repair material, which comprises the following steps: And mixing the magnesium phosphate-based rapid hardening repair material with water, and then performing construction and maintenance. Preferably, the mass ratio of the magnesium phosphate-based rapid hardening repair material to water is 1 (0.1-0.2). Compared with the prior art, the invention provides a magnesium phosphate-based rapid hardening repair material and a use method thereof. The magnesium phosphate-based rapid hardening repair material comprises 24 mass percent (43-72) of phosphate, 3-15 mass percent (3-15) of magnesium oxide, 3-5 mass percent of slag, retarder and alkali activator, wherein the alkali activator is sodium silicate or a mixture of sodium silicate and sodium hydroxide, the molar ratio of silicon content calculated by SiO 2 in the alkali activator to sodium content calculated by Na 2 O is less than or equal to 1.5:1, and the dosage of the alkali activator is 2-10wt% of the total mass of the steel slag and the slag. The invention uses the steel slag after the excitation of the specific alkali activator to replace part of magnesium oxide in the magnesium phosphate cement-based material, and improves the strength and water resistance of the material while maintaining the rapid hardening characteristic of the magnesium phosphate cement-based material. The magnesium phosphate-based rapid-hardening repair material provided by the invention has high solid waste mixing amount, higher strength and water resistance after construction is finished, solves the contradiction of high mixing amount and low strength of the traditional rapid-hardening repair material, and p