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Preparation method of calcium oxide expansion agents

A calcium oxide and expansion agent technology, applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of destroying cement concrete structure, long duration of hydration reaction, limited shrinkage compensation effect, etc., to achieve High expansion efficiency, reduced risk of drying shrinkage cracking, fast expansion rate

Active Publication Date: 2010-07-14
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Calcium oxide as a kind of expanded clinker was first invented and popularized in Japan. However, the expanded clinker produced in Japan is obtained by calcining limestone at a high temperature of 1400°C to 1600°C, and it is easy to produce a dense and non-porous superstructure. Burned calcium oxide, this kind of perburned calcium oxide has low reactivity, and the hydration reaction lasts for a long time, and this "extended expansion" performance may destroy the structure of cement concrete and affect the durability of concrete
There are relatively few domestic studies on using calcium oxide as an expanding clinker. Patent CN101333083A also has a report on using calcium oxide as an expanding clinker, but it is prepared by calcining limestone and bauxite at high temperature. Calcium oxide-calcium sulfoaluminate composite expansion clinker with two hydration products of calcium vanadium stone as the expansion source, calcium oxide is not a single expansion component
Although the introduction of calcium sulfoaluminate expansion source increases the expansion performance of expansive clinker, its hydration requires a large amount of water molecules, which determines that this type of expansion clinker with dual expansion sources is difficult to dry in water-deficient curing. Effective expansion under dry conditions, so limited compensation for shrinkage of cement concrete under dry conditions

Method used

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  • Preparation method of calcium oxide expansion agents
  • Preparation method of calcium oxide expansion agents
  • Preparation method of calcium oxide expansion agents

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Limestone with a mass ratio of 90:10 is mixed with a composite mineralizer and ground together by a ball mill to a fineness of 200m 2 / kg of raw meal powder, in which the composite mineralizer is composed of 55% gypsum and 45% copper slag. The ground raw meal powder was calcined at 1200°C, and kept at this temperature for 120 minutes (that is, the calcination time at 1200°C was 120 minutes). After the heat preservation was completed, the fired sample was taken out and quenched in air to obtain Calcium expanded clinker. Grind the prepared calcium oxide expanded clinker and dispersive carrier material together according to the ratio until the specific surface area is 300m 2 / kg, the mixing mass ratio is 80:20, and the dispersive carrier material is porous zeolite. After homogenization, it is sealed and packaged to obtain a calcium oxide expansion agent CEA-1 of the present invention that can effectively expand cement concrete in a dry environment. The product meets the ...

Embodiment 2

[0022] Limestone with a mass ratio of 90:10 is mixed with a composite mineralizer and ground together by a ball mill to a fineness of 200m 2 / kg of raw meal powder, in which the composite mineralizer is composed of 50% gypsum and 50% copper slag. The ground raw meal powder was calcined at 1250°C, and kept at this temperature for 80 minutes. After the heat preservation was completed, the fired sample was immediately taken out and quenched in the air to obtain calcium oxide expanded clinker. Grind the prepared calcium oxide expanded clinker and the dispersive carrier material together according to the ratio to a fineness of specific surface area of ​​250m 2 / kg, the mixing mass ratio is 77:23, and the dispersive carrier material is high-quality Class I fly ash. After homogenization, it is sealed and packaged to obtain a calcium oxide expansion agent CEA-2 of the present invention that can effectively expand cement concrete in a dry environment. The product meets the requirement...

Embodiment 3

[0024] Limestone with a mass ratio of 92:8 is mixed with a composite mineralizer and then ground together by a ball mill to a fineness of 200m 2 / kg of raw meal powder, in which the composite mineralizer is composed of 65% gypsum and 35% copper slag. The ground raw meal powder was calcined at 1300°C, and kept at this temperature for 50 minutes. After the heat preservation was completed, the fired sample was immediately taken out and quenched in the air to obtain calcium oxide expanded clinker. Grind the prepared calcium oxide expanded clinker and dispersive carrier material together according to the ratio until the specific surface area is 300m 2 / kg, the mixing mass ratio is 85:15, and the dispersive carrier material is composed of 60% porous zeolite and 40% high-quality Class I fly ash. After homogenization, it is sealed and packaged to obtain a calcium oxide expansion agent CEA-3 of the present invention that can effectively expand cement concrete in a dry environment. The...

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Abstract

The invention relates to a preparation method of calcium oxide expansion agents. The method comprises the following steps: mixing and grinding lime stone and composite mineralizer to obtain raw material, calcining at 1100-1300 DEG C to obtain calcium oxide expansion agent chamotte, and mixing and grinding the chamotte with disperse carrier to obtain the calcium oxide expansion agents, wherein composite mineralizer is composed of 50-70wt% of gypsum and 30-50wt% of copper slag, the weight ratio of composite mineralizer to lime stone is 5:95-10:90, and the weight ratio of calcium oxide expansion agent chamotte to disperse carrier is 75:25-90:10. The calcining heat of the calcium oxide expansion agents of the invention is relatively lower, calcium oxide is not easy to overheat; the water requirement of hydrated product is small, the expansion efficiency is high, the expansion rate is high; and cement concrete can realize effective expansion in dry environment.

Description

technical field [0001] The invention relates to a preparation method of calcium oxide expansion agent. Background technique [0002] Since the invention of expansive cement in France in the 1930s, especially since Japan separated the expansive component on the basis of expansive cement as a separate expansion agent, the concrete expansive agent has gradually developed into the largest amount used in the concrete industry. One of the admixtures, it is widely used in underground waterproof and anti-seepage projects, super-long structures and various large-scale concrete construction projects, and has become an effective technology to prevent concrete shrinkage and cracking. At present, most of the existing expansion agents in China are calcium vanadium type expansion agents with calcium sulfoaluminate hydrate as the main expansion source. They have many advantages in application, but the essential demand for water during hydration determines In addition, its compensation effe...

Claims

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Application Information

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IPC IPC(8): C04B22/06
CPCC04B40/0046C04B20/04Y02W30/91C04B14/047C04B14/28C04B18/08C04B18/144C04B20/002C04B22/143C04B28/02C04B2103/408
Inventor 刘加平张守治田倩缪昌文郭飞王育江姚婷张建业
Owner JIANGSU SOBUTE NEW MATERIALS
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