Cement-based composite material and preparation method thereof

A composite material and cement-based technology, applied in cement production and other directions, can solve the problems of failing to meet the high strength and fluidity requirements of ultra-high-performance cement-based composite materials, increasing the safety hazards of building structures, and increasing costs. The effect of increasing strength and reducing the amount of cement

Inactive Publication Date: 2014-03-26
NANJING EFFUL
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  • Claims
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Problems solved by technology

[0002] Ultra-high-performance cement-based composite materials generally refer to cement-based composite materials with a strength greater than 100 MPa and good fluidity and workability. They have broad application prospects in protection engineering, civil high-rise buildings, and nuclear waste disposal projects. The fatal point is that the strength is not high and the brittleness is high, which increases the safety hazard of the building structure and limits its wide application
Although the toughness can be significantly increased by mixing steel fibers, carbon fibers and polypropylene fibers, it is often necessary to compound ultra-fine slag, fly ash and steel slag, and even add some early strength agents and water reducing agents, otherwise it will not be possible to achieve super strength. The high strength and fluidity requirements of high-performance cement-based composite materials greatly increase the cost of production

Method used

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  • Cement-based composite material and preparation method thereof
  • Cement-based composite material and preparation method thereof
  • Cement-based composite material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0017] The components of this embodiment: including main materials and auxiliary materials, the main materials are all ordinary Portland cement, and the auxiliary materials include gypsum whiskers and urea. The mass fraction of urea in gypsum whiskers is 0.08%; the table in this embodiment shows that when the mass fraction of gypsum whiskers in the main material is 1%, 2%, 3%, 4%, the cement-based composite Various performance parameters of the material. In addition, various performance parameters of the cement-based composite material without gypsum whiskers are given.

[0018] The preparation method of this embodiment is as follows: adding desulfurized gypsum to a reactor containing water, and controlling the mass fraction ratio of desulfurized gypsum to water to be 0.025:1, 0.05:1, 0.75:1, and 0.1:1; Hydrothermal method, the control temperature is 150℃, the pressure is 0.2MPa, the reaction time is 2h, and the speed of the stirrer in the reactor is 200r / min; during the prepara...

Embodiment 2

[0023] The components of this embodiment: include main materials and auxiliary materials, the main materials include 90% ordinary Portland cement and 10% fly ash, and the auxiliary materials include gypsum whiskers and sodium oleate. The mass fraction of sodium oleate in gypsum whiskers is 0.6%; the table in this example shows that when the mass fraction of gypsum whiskers in the main material is 1%, 2%, 3%, and 4%, the cement The performance parameters of composite materials. In addition, various performance parameters of the cement-based composite material without gypsum whiskers are given.

[0024] The preparation method of this embodiment is as follows: adding desulfurized gypsum to a reactor containing water, and controlling the mass fraction ratio of desulfurized gypsum to water to be 0.025:1, 0.05:1, 0.75:1, and 0.1:1; Hydrothermal method, the control temperature is 165℃, the pressure is 0.23MPa, the reaction time is 2.5h, the speed of the stirrer in the reactor is 250r / m...

Embodiment 3

[0029] The components of this embodiment include main materials and auxiliary materials. The main materials include 85% ordinary Portland cement and 15% slag, and the auxiliary materials include gypsum whiskers and sodium stearate. The mass fraction of sodium stearate in gypsum whiskers is 0.6%; the table in this example shows that when the mass fraction of gypsum whiskers in the main material is 1%, 2%, 3%, 4%, the Various performance parameters of cement-based composite materials. In addition, various performance parameters of the cement-based composite material without gypsum whiskers are given.

[0030] The preparation method of this embodiment is as follows: adding desulfurized gypsum to a reactor containing water, and controlling the mass fraction ratio of desulfurized gypsum to water to be 0.025:1, 0.05:1, 0.75:1, and 0.1:1; Hydrothermal method, the control temperature is 174℃, the pressure is 0.28MPa, the reaction time is 3.0h, the speed of the stirrer in the reactor is ...

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Abstract

The invention discloses a cement-based composite material and a preparation method thereof. The cement-based composite material comprises a main material and auxiliary materials, wherein the main material comprises common Portland cement and a mineral admixture, and the auxiliary materials comprise gypsum whiskers and a whisker modifying agent. The preparation method comprises the steps of preparing gypsum whisker suspension liquid by using desulfurized gypsum, compounding the common Portland cement and the mineral admixture so as to obtain the main material, then pouring the gypsum whisker suspension liquid into the main material according to certain proportions, and then uniformly stirring, thus obtaining the high-strength cement-based composite material. According to the preparation method, the majority of gypsum whiskers which do not participate in hydration are tightly interpenetrated in the cement by using the micro-sized gypsum whiskers, and the toughness is improved through a crack bridging effect; the gypsum whiskers can be gradually hydrated and promote cement hydration in an alkaline environment, the hydrated gypsum whiskers participate in the hydration reaction of the cement so as to generate Aft, and the system strength is improved.

Description

technical field [0001] The invention relates to a building material, in particular to a high-strength cement-based composite material and a preparation method thereof. Background technique [0002] Ultra-high-performance cement-based composite materials generally refer to cement-based composite materials with a strength greater than 100 MPa and good fluidity and workability. They have broad application prospects in protection engineering, civil high-rise buildings, and nuclear waste disposal projects. The fatal point is that the strength is not high and the brittleness is large, which increases the safety hazard of the building structure and limits its wide application. Although the toughness can be significantly increased by mixing steel fibers, carbon fibers and polypropylene fibers, it is often necessary to compound ultra-fine slag, fly ash and steel slag, and even add some early strength agents and water reducing agents, otherwise it will not be possible to achieve supe...

Claims

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Application Information

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IPC IPC(8): C04B7/24C04B7/26C04B7/147
CPCY02P40/10
Inventor 何玉鑫万建东唐绍林瞿县唐永波
Owner NANJING EFFUL
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