Quick-setting brucite-phosphate-based cementing material as well as preparation method and application thereof
A technology of cementitious materials and phosphates, applied in the field of building materials, can solve the problems affecting the large-scale popularization and application of MPC-based materials, increase the micro-defects of the bonding interface of repair materials, and reduce the durability of repair projects, and achieve good durability, Dry shrinkage, fast development effect
Inactive Publication Date: 2020-10-23
TONGJI UNIV
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Problems solved by technology
In the process of field application, this hidden danger is often questioned and worried by field engineers, which affects the large-scale promotion and application of MPC-based materials
[0005] In addition, another disadvantage of MPC is that its hydration reaction is a rapid exothermic reaction process, and the heat of hydration is very large. The temperature of the slurry can rise rapidly or even exceed 80°C in a short time, which will increase the internal temperature of the repair material. Micro-defects in its bonded interface, as well as the risk of brittleness and cracking of the repair material, thereby reducing the durability of its restoration project, especially for large-volume restoration projects; when used for bone and tooth restoration, the temperature is too high cause discomfort to patients
Method used
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Experimental program
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Effect test
Embodiment 1
[0030] Cementitious and building materials are prepared by:
[0031] (1) Mix 100 parts of ammonium dihydrogen phosphate, 150 parts of brucite and 20 parts of borax in a mixer for 10-30 minutes to obtain a quick-setting brucite-phosphate-based cementitious material.
[0032] (2) Mix 1 part of cementitious material, 0.16 part of water and 1 part of sand, and stir fully to form a slurry (mortar);
[0033] (3) Pour the slurry into the mould, then vibrate for compaction and smoothing;
[0034] (4) Release the mold after curing for 1-3h, and maintain in the air for 3h-28 days, the temperature is 20±5°C, and the humidity is 70±10rh%. It is forbidden to directly put in water or spray water for curing to obtain building materials. Performance indicators are shown in Table 1.
Embodiment 2
[0036] The difference from Example 1 is that the composition of the gelling material is: 100 parts of ammonium dihydrogen phosphate, 200 parts of brucite and 25 parts of borax. Its performance indicators are shown in Table 1.
Embodiment 3
[0038] The difference from Example 1 is that the composition of the gelling material is: 100 parts of ammonium dihydrogen phosphate, 250 parts of brucite and 30 parts of borax. Its performance indicators are shown in Table 1.
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Abstract
The invention relates to a quick-setting brucite-phosphate-based cementing material as well as a preparation method and application thereof. Natural brucite minerals are used for completely replacingmagnesium oxide raw material which is prepared at high temperature to prepare a novel brucite-phosphate-based low-carbon cementing material. The invention particularly relates to a formula and a preparation technology of the brucite-phosphate-based low-carbon cementing material. The core content of the invention is a material formula which is composed of brucite, ammonium dihydrogen phosphate andborax. The preparation method of the cementing material comprises the following steps: preparing according to a required ratio, and mixing in a mixer for 10-30 minutes to obtain the product. The cementing material can be used by adding water and stirring, and the recommended water-binder ratio is 0.12-0.20. Compared with the prior art, the phosphate cementing material disclosed by the invention isequivalent in performance, but lower in production energy consumption and CO2 emission, and the system does not contain free magnesium oxide with potential stability hazards, so that the hydration heat release and setting time of the phosphate cementing material can be regulated and controlled.
Description
technical field [0001] The invention relates to the technical field of building materials, in particular to a fast-setting brucite-phosphate-based cementitious material and its preparation method and application. Background technique [0002] Magnesium-based cements, including magnesium phosphate cement (MPC), activated magnesium oxide cement, magnesium oxychloride cement, magnesium oxysulfate cement, etc., are considered to be one of the most potential candidates for low-carbon building materials, among which MPC has the most Good overall performance. Magnesium oxide is the most important raw material for the preparation of magnesia-based cement, and it is also the main source of energy consumption and greenhouse gas CO in its production. 2 largest source of emissions. It can generally be produced by dry method, that is, calcining magnesite at high temperature, and wet method, that is, processing magnesium-containing brine or seawater, among which dry method is the main m...
Claims
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IPC IPC(8): C04B12/02C04B28/34C04B111/72
CPCC04B12/02C04B28/34C04B2111/72C04B22/0013C04B22/066C04B14/06
Inventor 杨全兵
Owner TONGJI UNIV