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High-strength recycled cementing material product preparation method

A technology for regenerating cementitious materials and products, applied in cement production, etc., can solve the problems of low strength and large difference in hydration activity, etc., and achieve the effects of high utilization rate, short maintenance period, good mechanical properties and volume stability

Active Publication Date: 2018-06-19
HUBEI UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

This plan emphasizes that the calcination temperature can improve the hydration activity of the gelled material, but the hydration activity varies greatly at different temperatures, and the strength is low

Method used

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  • High-strength recycled cementing material product preparation method

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Experimental program
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Effect test

Embodiment 1-6

[0020] 1) The waste concrete is crushed, separated and ground to obtain waste cement stone powder, and the waste cement stone powder obtained by the crushing, separation and grinding is passed through an 80 μm square-hole sieve with no more than 10%. ;

[0021] 2) Heat the waste cement stone powder to 400-1000°C, keep it at the highest temperature for 1-3h, and then quench it or cool it naturally with the furnace to room temperature to obtain a recycled cementitious material;

[0022] 3) Add water to mature the cementitious material for 0.5-2h, add sand and gravel and the remaining water to mix evenly at the same time or after aging, then press to shape, and finally carbonize to obtain recycled cementitious material products; among them, recycled cementitious materials, water and sand The mass ratio of the three is 1:0.15-0.30:1-3; the carbonization condition is: CO 2 The concentration is not less than 99%, CO 2 The pressure is 0.3MPa and the carbonization time is 8h.

[0023] Speci...

Embodiment 7

[0028] The heating temperature of waste cement stone powder is 900℃, the holding time is 2h, and it is cooled with the furnace. The mass ratio of the regenerated cementitious material, water and sand is 1:0.25:1, the curing time is 2h, and the carbonization condition is CO 2 The concentration is greater than 99%, the carbonization pressure is 0.2MPa, and the carbonization time is 8h. The compressive strength of the product is 63MPa, without cracking.

Embodiment 8

[0030] The heating temperature of waste cement stone powder is 900℃, the holding time is 2h, and it is cooled with the furnace. The mass ratio of the regenerated cementitious material, water and sand is 1:0.25:1, the curing time is 2h, and the carbonization condition is CO 2 The concentration is greater than 99%, the carbonization pressure is 0.3MPa, and the carbonization time is 2h. The compressive strength of the product is 66MPa, without cracking.

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Abstract

The invention discloses a high-strength recycled cementing material product preparation method. The technical scheme comprises: crushing waste concrete, separating, and grinding to obtain waste cementstone powder; heating the waste cement stone powder to a temperature of 400-1000 DEG C, and cooling to a room temperature to obtain a recycled cementing material; and adding gravel and water to the recycled cementing material, uniformly stirring, carrying out pressing molding, and carbonizing to obtain the high-strength recycled cementing material product. According to the present invention, thepreparation method has advantages of simple process, low production cost, short production period and stable product performance.

Description

[0001] Technical solutions [0002] The invention belongs to the technical field of building materials, and specifically relates to a preparation method of a high-strength regenerated cementitious material product. Background technique [0003] Cement concrete is the largest construction and structural engineering material. With the ongoing large-scale infrastructure construction, the amount of waste concrete produced has increased sharply in recent years. If these waste concrete is not used, it will take up a lot of valuable land resources and serious Environmental pollution has become a social, economic and environmental issue that cannot be ignored. Therefore, how to fully, efficiently and economically utilize construction waste, especially waste concrete, has become a topic of joint research in many countries. [0004] At present, the technology and methods of recycling waste concrete at home and abroad are mainly concentrated in two aspects: one is the use of crushed waste conc...

Claims

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Application Information

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IPC IPC(8): C04B7/24C04B28/00
CPCC04B7/246C04B28/00C04B2111/00017C04B2201/50C04B14/06Y02P40/10
Inventor 张运华刘芷怡闵捷袁颂东张志鹏
Owner HUBEI UNIV OF TECH
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