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A kind of coated lightweight aggregate and its preparation method and application

A lightweight aggregate and coating technology, applied in the field of concrete preparation, can solve the problem of not finding lightweight aggregates

Active Publication Date: 2016-12-07
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

[0019] The coated lightweight aggregate described in this embodiment is aluminum oxide-triphenyl phosphate-chitosan coated ceramsite, and the preparation method of the coated lightweight aggregate is as follows:

[0020] (1) Chitosan: triphenyl phosphate: aluminum oxide: water in a ratio of 1:0.05:0.5:90 to prepare a coating slurry;

[0021] (2) Slurry: ceramsite is 1:1 to coat the surface of dry ceramsite, and filter excess slurry;

[0022] (3) Place the ceramsite after slurry coating treatment in alumina powder for secondary coating until the ceramsite particles are distinct;

[0023] (4) Dry the coated ceramsite at 40°C for 10 hours.

[0024] Slag portland cement, alumina-triphenyl phosphate-chitosan coated ceramsite, sand and water at 350kg / m 3 、400kg / m 3 、600kg / m 3 and 150kg / m 3 The concrete is mixed with the specific mix ratio, and the standard curing is 28 days. After 10 hours of high temperature at 1200 ℃, there is no bursting, and 20% of the mechanical strength r...

Embodiment 2

[0026] The coated lightweight aggregate described in this embodiment is silica-polysiloxane-polyurethane coated ceramsite, and the preparation method of the coated lightweight aggregate is as follows:

[0027] (1) Polyurethane: polysiloxane: silicon oxide: water in the ratio of 1:0.072:0.8:95 to prepare coating slurry;

[0028] (2) Slurry: Expanded perlite is 2:1 to coat the surface of dry expanded perlite, and filter excess slurry;

[0029] (3) The expanded perlite after slurry coating treatment is placed in silicon oxide powder for secondary coating until the expanded perlite particles are distinct;

[0030] (4) Dry the coated expanded perlite at 55°C for 6 hours.

[0031] Fly ash Portland cement, silica-polysiloxane-polyurethane coated expanded perlite, sand and water at 400kg / m 3 、450kg / m 3 、700kg / m 3 and 200kg / m 3 Mixed concrete with the specific mix ratio, standard curing for 28 days, after 10 hours of high temperature at 1200 ℃, no bursting, and 25% of the remainin...

Embodiment 3

[0033] The preparation of silicon oxide-sodium methyl silicate-acrylic resin coated pumice described in this embodiment, the preparation method of the coated lightweight aggregate is as follows:

[0034] (1) Acrylic resin: sodium methyl silicate: silicon oxide: water in a ratio of 1:0.1:1:100 to prepare coating slurry;

[0035] (2) Slurry: Pumice is 3:1 wrapped on the surface of dry pumice, and excess slurry is filtered;

[0036] (3) Place the pumice after slurry coating treatment in silicon oxide powder for secondary coating until the pumice particles are distinct;

[0037] (4) Dry the coated pumice stone at 60°C for 5 hours.

[0038] High alumina cement, silica-sodium methyl silicate-acrylic resin coated pumice, sand and water at 450kg / m 3 、500kg / m 3 、750kg / m 3 and 300kg / m 3 The concrete is mixed with the specific mix ratio, and the standard curing is 28 days. After 10 hours of high temperature at 1200 ℃, there is no bursting, and 30% of the mechanical strength remains. ...

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PUM

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Abstract

The invention discloses a coated light-weight aggregate, and a preparation method and application thereof, belonging to the technical field of concrete preparation. The coated light-weight aggregate is prepared from a film forming polymer, a film forming assistant, refractory oxide and water. The concrete prepared from the coated light-weight aggregate does not have the blowout condition under the high-temperature condition of 1200 DEG C for 10 hours, and the residual mechanical strength is 20-30%. The coated light-weight aggregate can be used for basic facility construction for smelting, petroleum extraction, nucleus and other high-temperature operations, and can also be sprayed on a common concrete structure surface as a fireproof layer.

Description

technical field [0001] The invention relates to a coated lightweight aggregate, a preparation method and application thereof, and belongs 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 d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/12
Inventor 郭荣鑫马倩敏孙彦琳林志伟颜峰赵志曼
Owner KUNMING UNIV OF SCI & TECH