Preparation method and application of coated lightweight aggregate

A lightweight aggregate and cladding technology, applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of not finding lightweight aggregate, and achieve the effect of low cost and superior high temperature resistance

Active Publication Date: 2015-04-22
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are currently no relevant literature reports on lightweight aggregate pre-wrapping.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The preparation method of coating lightweight aggregate described in this embodiment specifically comprises the following steps:

[0018] (1) Prepare sodium carbonate solution with a concentration of 6mol / L;

[0019] (2) Sodium carbonate solution and fly ash were mixed at a mass ratio of 1:5 to prepare a sodium carbonate-activated fly ash coating slurry;

[0020] (3) Wrap the slurry obtained in step (2) on the surface of dry ceramsite according to the slurry: ceramsite mass ratio of 1:1, and filter the excess slurry;

[0021] (4) Place the ceramsite after slurry coating treatment in fly ash for secondary coating until the ceramsite particles are distinct;

[0022] (5) The coated ceramsite was obtained after drying at 60°C for 24 hours.

[0023] The coated lightweight aggregate prepared in this example is used to prepare high temperature resistant concrete: slag Portland cement, sodium carbonate activated fly ash coated ceramsite, sand and water at 350kg / m 3 、450kg / m ...

Embodiment 2

[0025] The preparation method of coating lightweight aggregate described in this embodiment specifically comprises the following steps:

[0026] (1) Prepare sodium sulfate solution with a concentration of 8mol / L;

[0027] (2) Sodium sulfate solution and fly ash were mixed at a mass ratio of 1:6 to prepare a sodium sulfate-activated fly ash coating slurry;

[0028] (3) Wrap the slurry obtained in step (2) on the surface of the dry expanded perlite according to the slurry: expanded perlite mass ratio of 2:1, and filter the excess slurry;

[0029] (4) The expanded perlite after slurry coating treatment is placed in fly ash for secondary coating until the expanded perlite particles are distinct;

[0030] (5) Coated expanded perlite was obtained after drying at 70°C for 24 hours.

[0031] The coated lightweight aggregate prepared in this example is used to prepare high temperature resistant concrete: fly ash Portland cement, sodium sulfate stimulates fly ash coated expanded perli...

Embodiment 3

[0033] The preparation method of coating lightweight aggregate described in this embodiment specifically comprises the following steps:

[0034] (1) Prepare sodium hydroxide solution with a concentration of 10mol / L;

[0035] (2) Sodium hydroxide solution and granulated blast furnace slag are mixed at a mass ratio of 1:8 to prepare a sodium hydroxide-inspired granulated blast furnace slag coating slurry;

[0036] (3) Wrap the slurry obtained in step (2) on the surface of the dry pumice according to the slurry: pumice mass ratio of 3:1, and filter the excess slurry;

[0037] (4) Place the pumice after slurry coating treatment in granulated blast furnace slag for secondary coating until the pumice particles are distinct;

[0038] (5) Coated pumice was obtained after drying at 80°C for 5 hours.

[0039] The coated lightweight aggregate prepared in this example is used to prepare high temperature resistant concrete: high alumina cement, sodium hydroxide stimulates granulated blas...

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PUM

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Abstract

The invention discloses a preparation method and application of a coated lightweight aggregate, and belongs to the field of a concrete preparation technology. According to the invention, an alkali-activator solution, industrial waste residue and lightweight aggregate are used as raw materials to prepare the coated lightweight aggregate. Under high temperature effect of 1200 DEG C for 10 hours, concrete prepared from the coated lightweight aggregate prepared by the method provided by the invention has no crack phenomenon, and there is 30-40% residual mechanical strength. The concrete has characteristics of low cost, excellent high temperature resistance and the like. The coated lightweight aggregate can be applied to foundational facilities construction of high-temperature operations such as smelting, oil exploitation, nucleus and the like and sprayed on the surface of a general concrete structure as a fire protection layer.

Description

technical field [0001] The invention relates to a preparation method and application of coated lightweight aggregate, belonging to the technical field of concrete preparation. Background technique [0002] Concrete structures are often placed in high temperature environments or fire hazards. The effect of high temperature will attenuate the mechanical properties of concrete, and may burst, destroying the integrity of the concrete structure, causing economic losses, and threatening personal and property safety. The lightweight aggregate is made by volcanic eruption or artificial calcination, with low thermal conductivity and excellent high temperature resistance. After the high temperature of 800-1000 ℃, the relative residual mechanical properties of lightweight aggregate concrete are obviously better than ordinary aggregate concrete, and still have a certain bearing capacity (Sun Hongmei et al., high-alumina cement refractory concrete fire-resistant strength and durability ...

Claims

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Application Information

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IPC IPC(8): C04B18/08C04B18/14C04B14/18C04B14/04C04B28/08C04B28/04C04B28/06
CPCY02W30/91
Inventor 郭荣鑫马倩敏孙彦琳林志伟颜峰赵志曼
Owner KUNMING UNIV OF SCI & TECH
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