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A conductive porous lightweight aggregate loaded with modified agar gel, its preparation method and application

A technology of agar gel and lightweight aggregate, which is applied in the field of conductive concrete, can solve the problems of small length-to-diameter ratio, reduced concrete strength, and high price, and achieve the effects of reduced resistivity, lower resistivity, and good mechanical properties

Active Publication Date: 2017-03-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conductive materials such as granular or powdered graphite powder, carbon powder, coke and steel shavings have a small aspect ratio. When the dosage is small, the conductive materials are difficult to contact each other and cannot form a good conductive network. Poor; when the dosage is large, on the one hand, due to the low strength of carbon black, coke, etc., and on the other hand, due to the water absorption of conductive materials, the water demand (water-cement ratio) during concrete mixing will be increased, so that The strength of concrete is greatly reduced, and it is difficult to meet the needs of civil engineering for mechanical properties
Although carbon fiber can form a conductive network at a low content, but because the contact surface of the fiber overlap is small, the electrical conductivity is low, and it is necessary to increase the fiber content to improve its conductivity; and too high fiber content will make it The fibers are agglomerated into bundles during stirring, which is difficult to disperse, and a large number of air bubbles are easily introduced during molding, which reduces the strength of concrete
Due to the thicker diameter, it is difficult for the steel fibers to form an overlapping conductive network when the content is low, and the electrical conductivity is poor; when the fiber content is high, the concrete workability is poor, and it is difficult to use conventional methods for construction
Therefore, it is difficult for the currently researched conductive concrete to better meet the requirements of electrical conductivity.
In addition, due to the high price of conductive component materials such as graphite and carbon fiber, the cost of conductive concrete is generally high, which is much higher than that of ordinary concrete.

Method used

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  • A conductive porous lightweight aggregate loaded with modified agar gel, its preparation method and application
  • A conductive porous lightweight aggregate loaded with modified agar gel, its preparation method and application
  • A conductive porous lightweight aggregate loaded with modified agar gel, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Conductive lightweight porous ceramsite loaded with modified agar is prepared by immersing thermally modified agar aqueous solution, and cement-based material products for conductivity or antistatic are prepared by this method:

[0028] (1) According to the mass ratio of 100:6:0.6:3, weigh water and NaNO 2 , NaOH and agar powder;

[0029] (2) Add the agar powder into the water first, keep stirring and heat until boiling until the agar is completely dissolved, then add NaOH, NaNO 2 Add the weighed modified electrolyte in the following order, keep the solution temperature above 90°C and keep stirring for 30s to prepare the modified agar aqueous solution;

[0030] (3) Add porous ceramsite smaller than the volume of the solution into the aqueous solution, continue to stir for 5 minutes, then remove the impregnated ceramsite, and quickly air-cool until the agar is solidified into a gel, and peel off the excess surface of the agar. Agar gel, which is to obtain porous cerams...

Embodiment 2

[0032] Conductive lightweight porous ceramsite loaded with modified agar is prepared by immersing thermally modified agar aqueous solution, and cement-based material products for conductivity or antistatic are prepared by this method:

[0033] (1) According to the mass ratio of 100:6:0.5:3, weigh water and NaNO 2 , NaOH and agar powder;

[0034](2) Add the agar powder into the water first, keep stirring and heat until boiling until the agar is completely dissolved, then add NaOH, NaNO 2 Add the weighed modified electrolyte in the following order, keep the solution temperature above 90°C and keep stirring for 30s to prepare the modified agar aqueous solution;

[0035] (3) Add porous ceramsite smaller than the volume of the solution into the aqueous solution, continue to stir for 5 minutes, then remove the impregnated ceramsite, and quickly air-cool until the agar is solidified into a gel, and peel off the excess surface of the agar. Agar gel, which is to obtain porous ceramsi...

Embodiment 3

[0037] The above-mentioned conductive particles are used as lightweight aggregates for the preparation of cement mortar, and the mortar ratio is as follows:

[0038] Table 1

[0039] Example Cement (PII 42.5R) (g) Composite ceramsite (g) water (g) 1 540 430 238 2 540 550 238

[0040] The mortar prepared according to the ratio of No. 1 in the above table is formed into image 3 After the 40*40*160mm mortar size specimen is in good condition, the four-point test method is adopted within a certain age period, and the resistivity data is tested by applying a 3V DC power supply, and the calculated figure 2 Trend chart of resistivity change. The siliceous aggregate group in the figure is the trend diagram of resistivity change of standard mortar produced by the national standard method, and the empty ceramsite group is the trend diagram of resistivity change of mortar made of the same blank ceramsite. It can be seen from the information in the di...

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Abstract

The invention discloses conductive porous lightweight aggregate loaded with modified agar gel, and a preparation method and application of the conductive porous lightweight aggregate. The preparation method comprises the following steps: (1) preparing a modified agar aqueous solution: firstly adding agar powder into water to obtain a mixture, heating the mixture until agar is completely dissolved, adding inorganic salt electrolytes, keeping the temperature of the solution to be higher than 90 DEG C and continuously stirring the solution for more than 30 seconds, thereby obtaining the modified agar aqueous solution; (2) immersing porous ceramsite into the modified agar aqueous solution, keeping the temperature of the solution to be higher than 90 DEG C, and continuously stirring the solution for more than 5 minutes; and fishing out the immersed ceramsite, carrying out air-cooling on the immersed ceramsite quickly until agar is solidified into gel, and peeling off excessive agar gel on the surface of the ceramsite, thereby obtaining the conductive porous lightweight aggregate loaded with modified agar gel. The porous ceramsite composite modified agar conductive lightweight aggregate disclosed by the invention is applied to conductive concrete, so that the volume-weight of mortar / concrete can be further reduced while resistivity of the concrete is remarkably reduced.

Description

technical field [0001] The invention belongs to a functional building material in the field of conductive concrete, and in particular relates to a preparation method and application of a conductive porous lightweight aggregate loaded with modified agar gel. Background technique [0002] Concrete has been widely used in the field of civil engineering because of its excellent mechanical properties, and it is currently the most widely used building material. Ordinary concrete has a high resistivity and is a poor conductor of electricity. Adding a certain amount of conductive components to ordinary concrete can greatly improve its conductivity and prepare conductive concrete. Conductive concrete not only has the characteristics of structural materials, but also has the characteristics of conductivity and alertness, so that concrete can not only be used as structural materials, but also in electrical engineering, electromagnetic interference shielding, industrial anti-static, el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B14/02C04B41/82
Inventor 余其俊郭文昊胡捷张漳敏朱洋洋王羊洋韦江雄李方贤范庆新马玉玮
Owner SOUTH CHINA UNIV OF TECH
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