Preparation method of nano carbon black modified conductive cement

A technology of nano-carbon black and conductive cement, which is applied in the field of preparation of nano-carbon black modified conductive cement, which can solve the problems of poor compatibility, low sensitivity, and poor durability of concrete structures, and achieve good conductivity and high softness , Improve the effect of strength and toughness

Inactive Publication Date: 2018-07-03
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these sensors have disadvantages such as poor durability, low sensitivity, high cost, and poor compatibility with concrete structures.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A preparation method of nano carbon black modified conductive cement, comprising the following steps:

[0019] (1) Add 45 parts of water, 2 to 5 parts of water-based dispersant HPMA and stir for 1 to 2 minutes, add 2 parts of nano-carbon black and stir for 1 to 2 minutes in parts by weight; add 85 parts of Portland cement, powder 9 parts of coal ash, 5 parts of stainless steel microfilament, 0.02 parts of superplasticizer and stir for 5-10 minutes;

[0020] (2) pouring the mixture obtained in step (1) into the mould;

[0021] (3) Put the mold into a curing box for curing for 15 days and then demould; the temperature of the curing box is 18° C., and the relative humidity is 92%.

[0022] The particle size of the nano-carbon black is 36-40nm, and the specific surface area is 1612-1856m 2 / g, and the resistivity is 0.2-5.6Ω·cm.

[0023] The strength grade of the Portland cement is C35.

[0024] The specific surface of the fly ash is 520~760m 2 / kg.

[0025] The diame...

Embodiment 2

[0027] A preparation method of nano carbon black modified conductive cement, comprising the following steps:

[0028] (1) Add 55 parts of water, 5 parts of water-based dispersant HPMA and stir for 1 to 2 minutes in order by weight in the cement slurry mixer, add 8 parts of nano-carbon black and stir for 1 to 2 minutes; add 98 parts of Portland cement, fly ash 12 parts, 8 parts of stainless steel microwire, 0.08 parts of superplasticizer and stir for 10 minutes;

[0029] (2) pouring the mixture obtained in step (1) into the mould;

[0030] (3) Put the mold in a curing box for curing for 20 days and then demould; the temperature of the curing box is 22° C., and the relative humidity is 94%.

[0031] The particle size of the nano-carbon black is 36-40nm, and the specific surface area is 1612-1856m 2 / g, and the resistivity is 0.2-2.6Ω·cm.

[0032] The strength grade of the Portland cement is C40.

[0033] The specific surface of the fly ash is 520~760m 2 / kg.

[0034] The d...

Embodiment 3

[0036] A preparation method of nano carbon black modified conductive cement, comprising the following steps:

[0037] (1) Add 50 parts of water, 4 parts of water-based dispersant HPMA and stir for 1 to 2 minutes, add 5 parts of nano-carbon black and stir for 1 to 2 minutes according to parts by weight; add 90 parts of Portland cement, fly ash 10 parts, 6 parts of stainless steel microwire, 0.05 parts of water reducer and stir for 5 minutes;

[0038] (2) pouring the mixture obtained in step (1) into the mould;

[0039] (3) Put the mold into a curing box for curing for 16 days and then remove the mold; the temperature of the curing box is 20° C., and the relative humidity is 94%.

[0040] The particle size of the nano-carbon black is 36-40nm, and the specific surface area is 1612-1856m 2 / g, and the resistivity is 0.2-5.6Ω·cm.

[0041] The strength grade of the Portland cement is C35.

[0042] The specific surface of the fly ash is 520~760m 2 / kg.

[0043] The diameter of ...

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Abstract

The invention discloses a preparation method of nano carbon black modified conductive cement, wherein the nano carbon black modified conductive cementis prepared from the following components in partsby weight: 80-95 parts of silicate cement, 9-12 parts of coal ash, 5-8 parts of stainless microfilaments, 0.02-1.00 part of a water reducer, 2-8 parts of nano carbon black and 2-5 parts of an aqueousdispersant, wherein the grain sizes of the nano carbon black are 36-40nm, the specific surface area is 1612-1856 m<2>/g and the resistivity is 0.2-5.6 ohm.cm. The cement obtained by the method disclosed by the invention has excellent conductivity, pressure sensitivity and durability, and has good compatibility with a concrete structure.

Description

technical field [0001] The invention relates to a preparation method of nano carbon black modified conductive cement. Background technique [0002] Concrete is the most widely used building material in modern times. It has the advantages of abundant raw materials, low price, simple process, high strength and good durability. Ready-mixed concrete is a kind of concrete, which refers to cement, aggregates, water, admixtures, mineral admixtures and other components mixed in according to a certain proportion in a mixing station after being measured and mixed, and sold. Concrete mixture transported to the place of use within the specified time by transport truck. Because of the high environmental impact of on-site construction, ready-mixed concrete has received increasing attention. Due to environmental conditions such as external loads and corrosion, material aging and fatigue, concrete structures such as bridges and house buildings are prone to failure during service, threaten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/94
CPCC04B28/04C04B2111/94C04B2103/408C04B14/022C04B18/08C04B14/48C04B2103/302
Inventor 张庆亮赵岩张志伟
Owner DALIAN UNIV OF TECH
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