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Rice hull ash-paraffin wax phase-change aggregate and preparation method thereof

A technology of rice husk ash and paraffin, which is applied in the field of rice husk ash-paraffin phase change aggregate, can solve the problems of large water demand and affect the popularization and application of concrete, and achieves lower temperature peak, good work adaptability, delayed heating and cooling effect of speed

Inactive Publication Date: 2012-01-04
WUHAN UNIV OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rice husk ash has a rich pore structure, and when it is mixed into fresh concrete, it needs a lot of water, which seriously affects its popularization and application in concrete

Method used

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  • Rice hull ash-paraffin wax phase-change aggregate and preparation method thereof
  • Rice hull ash-paraffin wax phase-change aggregate and preparation method thereof
  • Rice hull ash-paraffin wax phase-change aggregate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Take 3Kg of rice husk ash with a particle size of less than 1.18mm, and 3Kg of paraffin particles with a particle size of not more than 2.36mm (the temperature corresponding to the highest peak of the endothermic peak of phase transition is 52°C), mix them evenly, and place them in a metal container to seal . Then place the metal container in a high temperature environment of 78°C for 10 hours, open the release valve of the metal container, release the air for 5 seconds, and close the valve to balance the air pressure in the container and the high temperature environment.

[0054] Then the metal container was transferred to another 42°C low temperature environment for 6 hours. In a lower environment, a negative pressure state is formed in the metal container, which is more conducive to the entry of paraffin into the pore structure of the rice husk ash.

[0055] Take out the metal container, disperse the composite product of rice husk ash and paraffin into particles wit...

Embodiment 2

[0059] Take 3Kg of rice husk ash with a particle size of 1.18mm, and 2Kg of paraffin wax particles with a particle size of no more than 2.36mm (the temperature corresponding to the highest peak of the endothermic peak of phase transition is 48°C), mix them evenly, and place them in a metal container to seal . Then place the metal container in an oven at 160°C to keep it warm.

[0060] After heating for 6 hours, open the vent valve of the metal container, vent for 5 seconds, and close the valve. In order to balance the air pressure in the container with the air pressure in the oven at 160°C.

[0061] The metal container was transferred to another oven at 72°C for 2 hours. In a lower environment, a negative pressure state is formed in the metal container, which is more conducive to the entry of paraffin into the pore structure of the rice husk ash.

[0062] Take out the metal container, disperse the composite product of rice husk ash and paraffin into particles with a particl...

Embodiment 3

[0066] Take 3Kg of rice husk ash with a particle size of less than 1.18mm, and 2.4Kg of paraffin wax particles with a particle size of not more than 2.36mm (the temperature corresponding to the highest peak of the endothermic peak of phase transition is 48°C), mix them evenly, and place them in a metal container seal. Then place the metal container in an oven at 120°C to keep it warm.

[0067] After heating for 8 hours, open the vent valve of the metal container, vent for 5 seconds, and close the valve. In order to balance the air pressure in the container with the air pressure in the oven at 120°C.

[0068] The metal container was transferred to another oven at 58°C for 4 hours. In a lower environment, a negative pressure state is formed in the metal container, which is more conducive to the entry of paraffin into the pore structure of the rice husk ash.

[0069] Take out the metal container, quickly sieve the composite product of rice husk ash and paraffin into a clean en...

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Abstract

The invention relates to a rice hull ash-paraffin wax phase-change aggregate and a preparation method thereof. The rice hull ash-paraffin wax phase-change aggregate is characterized by comprising three materials including rice hull ash, paraffin wax and mineral powder, wherein the mass of the mineral powder accounts for 35 to 50 percent of the total mass of the rice hull ash, paraffin wax and mineral powder; and the mass ratio of paraffin wax to rice hull ash ranges from 1:1 to 1:5. The method comprises: mixing industrial rice hull ash and paraffin wax, and heating the mixture to allow the paraffin wax to melt into the pores in the rice hull ash, wherein a certain negative pressure is generated in the container by high-low temperature regulation to increase the melt amount of paraffin wax in the rice hull ash; sieving the mixed product of the rice hull ash and paraffin wax to obtain small particles of the mixed product; covering the small particles with powder; and thus, obtaining the rice hull ash-paraffin wax phase-change aggregate. The preparation process of the rice hull ash-paraffin wax phase-change aggregate is simple and low in cost, the paraffin wax content in the aggregate is high, the temperature control effect is desirable, and the adaptability to concrete is high.

Description

technical field [0001] The invention relates to the field of phase change materials, in particular to rice husk ash-paraffin phase change aggregates used for temperature control of cement concrete. Background technique [0002] The temperature damage of mass concrete has always been a very serious engineering problem. At present, the application of phase change materials in concrete has become a research hotspot. Phase change materials have heat storage characteristics. When the temperature rises to the phase transition point, the phase change absorbs heat, and when the temperature drops to the phase transition point, it can also phase change and release heat. Therefore, it can be used to suppress the heat of hydration of mass concrete Temperature rise rate, so as to avoid deformation and damage of concrete. [0003] According to the phase change mode, phase change materials can be generally divided into four categories: solid-solid phase change materials, solid-liquid phas...

Claims

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Application Information

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IPC IPC(8): C04B18/06C09K5/06
CPCY02W30/91
Inventor 马保国王军张建亮杨文牛翠峰
Owner WUHAN UNIV OF TECH
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