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Method for preparing high-strength lightweight aggregate by using floating beads

A lightweight aggregate and floating beads technology, applied in the field of concrete lightweight aggregate, can solve the problems of high requirements for production equipment, high sintering temperature, and large energy consumption

Active Publication Date: 2021-06-08
NANJING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the preparation of light and high-strength ceramsite is mainly through sintering, that is, the material produces a high-viscosity liquid phase at high temperature. At this time, the material generates gas, and the viscous green body restricts the gas from overflowing, so that the volume of ceramsite expands during sintering. , a large number of holes appear in the interior, and the apparent density decreases
The sintering method to prepare ceramsite, because the sintering temperature is high, not only has high requirements for production equipment, but also consumes a lot of energy, which is not economical and environmentally friendly.

Method used

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  • Method for preparing high-strength lightweight aggregate by using floating beads
  • Method for preparing high-strength lightweight aggregate by using floating beads

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this embodiment, a method for preparing high-strength lightweight aggregate by using floating beads is as follows:

[0037] The first step is to weigh according to the mass percentage of fly ash floating beads: cement: fly ash: water: water glass (modulus 2, concentration greater than 35wt%) = 3.5: 224: 1381: 402: 2.3, first weigh the Pour the dry powder of the material into the stirring pot and stir for 2 minutes, then weigh the ball water and the water glass solution in proportion, mix them evenly, pour them into the stirring pot, and continue stirring for 2 minutes to obtain the wet mixture;

[0038] In the second step, pour the prepared wet mixture into the pelletizing pan and roll it centrifugally, until the pellets with a size of 5-30 mm are formed in the pelletizing tray, then unload the pellets;

[0039] The third step is to place the unloaded balls in a cool place indoors for 24 hours for pre-curing to make them have a certain initial strength;

[0040] The...

Embodiment 2

[0042] In this embodiment, a method for preparing high-strength lightweight aggregate by using floating beads is as follows:

[0043] The first step is to weigh according to the mass percentage of fly ash floating beads: cement: fly ash: water: water glass (modulus 1.6, concentration greater than 35wt%) = 90: 240: 1093: 356: 4.6, first weigh the Pour the dry powder of the material into the stirring pot and stir for 2 minutes, then weigh the ball water and the water glass solution in proportion, mix them evenly, pour them into the stirring pot, and continue stirring for 2 minutes to obtain the wet mixture;

[0044] In the second step, pour the prepared wet mixture into the pelletizing pan and roll it centrifugally, until the pellets with a size of 5-30 mm are formed in the pelletizing tray, then unload the pellets;

[0045] The third step is to place the unloaded balls in a cool place indoors for 24 hours for pre-curing to make them have a certain initial strength;

[0046] Th...

Embodiment 3

[0048] In this embodiment, a method for preparing high-strength lightweight aggregate by using floating beads is as follows:

[0049] The first step is to weigh according to the mass percentage of fly ash floating beads: cement: fly ash: water: water glass (modulus 1.4, concentration greater than 35wt%) = 135: 256: 914: 326: 6.3, first weigh the Pour the dry powder of the material into the stirring pot and stir for 2 minutes, then weigh the ball water and the water glass solution in proportion, mix them evenly, pour them into the stirring pot, and continue stirring for 2 minutes to obtain the wet mixture;

[0050] In the second step, pour the prepared wet mixture into the pelletizing pan and roll it centrifugally, until the pellets with a size of 5-30 mm are formed in the pelletizing tray, then unload the pellets;

[0051] The third step is to place the unloaded balls in a cool place indoors for 24 hours for pre-curing to make them have a certain initial strength;

[0052]The...

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Abstract

The invention discloses a method for preparing a high-strength lightweight aggregate by using floating beads. The method comprises the following four steps: pre-wetting and stirring a mixture, balling the mixture, standing and pre-curing a lightweight aggregate, and carrying out hydrothermal reaction, and specifically comprises the following steps: firstly, pre-wetting and stirring the raw materials such as the floating beads, fly ash, cement, water, water glass and the like to prepare the mixture, feeding the mixture into a rolling balling disc, performing centrifugal rolling to gradually form the lightweight aggregate, and subjecting the lightweight aggregate to static curing and hydrothermal reaction, so that the strength of the lightweight aggregate is further improved, and the lightweight high-strength floating bead lightweight aggregate is obtained.

Description

technical field [0001] The invention relates to a preparation method of artificial lightweight high-strength lightweight aggregate, which belongs to the technical field of concrete lightweight aggregate. Background technique [0002] As an artificial aggregate, ceramsite plays an important role in improving the performance of concrete. Adding an appropriate amount of ceramsite in concrete can firstly reduce the apparent density of concrete and reduce the self-weight of components, and secondly, it can improve the workability of concrete mixture and improve the working performance of concrete. In addition, after adding ceramsite in concrete, the bleeding phenomenon of concrete is reduced, the hydration of cement is promoted, and the water retention performance of concrete is improved. Ceramsite can be adjusted according to the particle gradation required by concrete. Well-graded ceramsite can have the largest bulk density. Ceramsite replaces gravel as concrete coarse aggrega...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B38/08C04B111/40
CPCC04B28/04C04B2111/40C04B2201/20C04B2201/50C04B18/082C04B18/08C04B38/0067Y02W30/91
Inventor 崔崇张耀崔晓昱
Owner NANJING UNIV OF SCI & TECH
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