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High-early-strength magnesium phosphate concrete and preparation method thereof

A technology of strong magnesium phosphate and concrete, which is applied in the field of building materials, can solve the problems of high material cost, unfavorable popularization and application, and fast setting speed, and achieve good resistance to seawater erosion, easy popularization and application, and low drying shrinkage.

Inactive Publication Date: 2009-03-18
汪宏涛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This fast hard road repair material utilizes the characteristics of high strength and fast setting speed of magnesium phosphate cement, but the ammonium dihydrogen phosphate used in it will release irritating ammonia gas during the hydration reaction process, which will not only pollute the environment, but also It will cause harm to the human body, which is not conducive to the promotion and application of this material
Moreover, this repair material and other magnesium phosphate cements are limited to the form of cement paste and mortar, without coarse aggregate, resulting in high material costs and the problem of large shrinkage

Method used

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  • High-early-strength magnesium phosphate concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) according to the percentage by weight of each following component get the raw materials ready:

[0033] Magnesium oxide (specific surface area is 3500cm 2 / g): 23.3%

[0034] Potassium dihydrogen phosphate: 8.0%

[0035] Sodium dihydrogen phosphate: 3.7%

[0036] Boric acid: 1.9%

[0037] River sand (fineness modulus 2.6): 19.2%

[0038] Stones (limestone crushed stone with particle size less than 10mm) 36.1%

[0039] Water (tap): 7.8%

[0040] (2) Preparation of concrete

[0041] Start the concrete mixer, add magnesium oxide, boric acid, potassium dihydrogen phosphate, sodium dihydrogen phosphate, river sand and stones in sequence while stirring, and mix until uniform; finally, add tap water to the concrete mixer and stir quickly for 2 minutes to obtain concrete slurry .

[0042] (3) Performance testing

[0043] ①Mechanical performance testing

[0044] After pouring the concrete slurry for 2 hours, the measured compressive strength was 21.1MPa, the 1d com...

Embodiment 2

[0052](1) according to the percentage by weight of each following component get the raw materials ready:

[0053] Magnesium oxide (specific surface area is 4000cm 2 / g): 23.2%

[0054] Potassium dihydrogen phosphate: 9.2%

[0055] Sodium dihydrogen phosphate: 2.5%

[0056] Borax: 1.5%

[0057] Sodium polyphosphate: 0.3%

[0058] Zhanjiang sea sand (fineness modulus 1.8): 19.1%

[0059] Stones (broken pebbles with particle size less than 20mm): 35.9%

[0060] Water (Zhanjiang Seawater): 8.3%

[0061] (2) Preparation of concrete

[0062] Start the concrete mixer, add magnesia, borax, sodium polyphosphate, potassium dihydrogen phosphate, sodium dihydrogen phosphate, sea sand and pebbles in sequence while stirring, and mix until uniform; finally add sea water to the concrete mixer and stir quickly for 2 minutes , to get concrete slurry.

[0063] (3) Mechanical performance testing

[0064] After the concrete slurry was poured for 2 hours, the measured compressive strength...

Embodiment 3

[0066] (1) according to the percentage by weight of each following component get the raw materials ready:

[0067] Magnesium oxide (specific surface area is 4500cm 2 / g): 12.7%

[0068] Potassium dihydrogen phosphate: 8.7%

[0069] Sodium dihydrogen phosphate: 4.0%

[0070] Boric acid: 0.9%

[0071] Sodium polyphosphate: 0.3%

[0072] River sand (fineness modulus 2.6): 21.4%

[0073] Stones (limestone gravel with particle size less than 20mm): 44.5%

[0074] Water (tap water): 7.5%

[0075] (2) Preparation of concrete

[0076] Start the concrete mixer, add magnesium oxide, boric acid, sodium polyphosphate, potassium dihydrogen phosphate, sodium dihydrogen phosphate, river sand and stones in sequence while stirring, and mix until uniform; finally, add tap water to the concrete mixer and stir quickly for 2 minutes , to get concrete slurry.

[0077] (3) Mechanical performance testing

[0078] After the concrete slurry was poured for 2 hours, the measured compressive str...

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Abstract

The invention discloses a quick-hardening early strength magnesium phosphate concrete, which is mainly prepared from the following components in weight percentage: 12.7 to 30 percent of magnesia, 8.7 to 20 percent of phosphate, 1.2 to 15 percent of retarder, 10 to 25 percent of fine aggregate, 10 to 50 percent of water and the balance being water. The concrete material has the characteristics of quick coagulation and hardening, high early strength, good erosion resistance and the like, and can be widely applied to the quick repairing in projects or structures such as railways, airfields, bridges, harbors and docks and the quick solidification and closing of toxic and harmful substances, and can also be applied to the civil engineering and building construction under the sever conditions of sulfate erosion, marine corrosion, low temperature and the like. The invention has the advantages of simple preparation method, process and necessary equipment, low cost, no pungent ammonia gas generation in the construction and convenient popularization and application.

Description

technical field [0001] The present invention relates to a building material, specifically, a rapid-hardening and early-strength magnesium phosphate concrete, which can be used for rapid repair of roads, airports, bridges, port wharves and other projects or structures, and rapid curing and sealing of toxic and harmful substances , It can also be used in civil engineering projects under harsh conditions such as sulfate erosion, seawater erosion, and low temperature environments. Background technique [0002] Magnesium phosphate cement (MPC) is prepared by a certain proportion of MgO, phosphate, retarder and mineral admixture. Among them, MgO as one of the main raw materials is made of magnesite (MgCO 3 ) is calcined at a high temperature of about 1700°C; phosphate is another important raw material for the production of magnesium phosphate cement, which mainly provides an acidic environment and phosphate ions for the hydration reaction. At present, ammonium dihydrogen phosphat...

Claims

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Application Information

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IPC IPC(8): C04B28/34C04B14/06
CPCC04B28/34C04B2111/2015C04B2111/24C04B2111/00767C04B2111/72Y02W30/91C04B14/02C04B14/043C04B14/06C04B14/26C04B18/08C04B22/066C04B2103/22
Inventor 汪宏涛
Owner 汪宏涛
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