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Method for measuring heat conductivity coefficient of lightweight aggregate

A technology of thermal conductivity and lightweight aggregate, which is applied in the intersecting field of building materials and mesomechanics, can solve problems such as the difficulty in measuring the thermal conductivity of lightweight aggregate, and achieve the effect of reducing the possibility of error and ensuring integrity

Active Publication Date: 2017-05-10
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for measuring the thermal conductivity of lightweight aggregates in view of the defect that it is difficult to measure the thermal conductivity of lightweight aggregates in the prior art

Method used

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  • Method for measuring heat conductivity coefficient of lightweight aggregate
  • Method for measuring heat conductivity coefficient of lightweight aggregate
  • Method for measuring heat conductivity coefficient of lightweight aggregate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] The composition is cement mortar with a bulk density of 792kg / m 3 Determination of thermal conductivity of shale pottery sands.

[0096] Preparation of raw materials:

[0097] Fine aggregate: shale ceramsite, particle size 0-3mm, bulk density 792kg / m3 .

[0098] Cement: Ordinary Portland cement with strength grade 42.5, relative density 3.1, specific surface area 3590cm 2 / g.

[0099] A method for measuring thermal conductivity of lightweight fine aggregate, the steps of which are:

[0100] 1) Prepare test pieces and conduct tests to determine thermal conductivity

[0101] (a) Determine the mix ratio: when the water-cement ratio is 0.35, 0.45, 0.55, the following table determines the mix ratio of each component material of cement mortar (Table 1). In addition, when the volume ratio of light and fine aggregate is 0, it means cement slurry and will not be listed separately.

[0102] Table 1. Mixing ratio of cement slurry and cement mortar

[0103]

[0104] (b) M...

Embodiment 2

[0135] The bulk density is 877kg / m 3 Determination of thermal conductivity of shale ceramsite.

[0136] Preparation of raw materials:

[0137] Light and coarse aggregate: particle size 4-10mm, bulk density 877kg / m 3 , apparent dry density ρ a =1662kg / m 3 .

[0138] Cement: Ordinary Portland cement with strength grade 42.5, relative density 3.1, specific surface area 3590cm 2 / g.

[0139] Fine aggregate: river sand, bulk density 1539kg / m 3 .

[0140] A method for measuring the thermal conductivity of lightweight aggregates, the steps of which are:

[0141] Table 5. Mixing ratio of cement mortar and concrete

[0142]

[0143] 1) Preparation of specimens and mechanical tests to determine mechanical parameters

[0144] (a) Determining the mix ratio: when the volume ratio of the light-coarse aggregate is =23.2%, the above table determines the mix ratio of each component material of the concrete (Table 5). In addition, when the volume ratio of light-to-coarse aggregate...

Embodiment 3

[0155] The bulk density is 785kg / m 3 Determination of thermal conductivity of shale ceramsite.

[0156] Preparation of raw materials:

[0157] Lightweight aggregate: particle size 4-10mm, bulk density 785kg / m 3 , apparent dry density ρ a =1533kg / m 3 .

[0158] Cement: Ordinary Portland cement with strength grade 42.5, relative density 3.1, specific surface area 3590cm 2 / g.

[0159] Fine aggregate: river sand, bulk density 1539kg / m 3 .

[0160] A method for measuring the thermal conductivity of lightweight aggregates, the steps of which are:

[0161] 1) Preparation of specimens and mechanical tests to determine mechanical parameters

[0162] (a) Determine the mix ratio: when the volume ratio of lightweight aggregate is V a =44.8%, the following table determines the mix ratio of each component material of concrete (Table 7). In addition, when the volume ratio of lightweight aggregate is 0, it means cement mortar and will not be listed separately.

[0163] Table 7. Mix...

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Abstract

The invention discloses a method for measuring the heat conductivity coefficient of a lightweight aggregate. The method comprises the following steps: S1, preparing a concrete test piece and determining the heat conductivity coefficient through a test: determining the mixture ratio of components of cement paste, cement mortar or concrete, manufacturing the test piece according to the standard, and measuring the heat conductivity coefficient of the cement paste, the cement mortar or the concrete through the test; and S2, deducing the heat conductivity coefficient of the lightweight aggregate by an iterative dilution model of a homogenizing method, evaluating the calculation value of the heat conductivity coefficient of concrete or the cement mortar under a certain volume ratio of the lightweight aggregate by combining the heat conductivity coefficient of the cement mortar or the cement paste determined by the test, and comparing the calculation value and the test value to evaluate deviation. The method provided by the invention is simple and convenient to operate, the integrity of a measuring object is guaranteed, the heat conductivity coefficient of the lightweight aggregate evaluated through measurement accurately reflects the heat conductivity coefficient feature of the lightweight aggregate in the concrete material, and high-quality test data are provided for the preparation of lightweight aggregate concrete.

Description

technical field [0001] The invention relates to the intersecting fields of building materials and mesomechanics, in particular to a method for measuring the thermal conductivity of lightweight aggregates. Background technique [0002] Thermal conductivity is an important performance parameter of engineering materials. It can be regarded as a measure of the thermal insulation performance of materials under a certain temperature difference. The larger the value, the greater the heat transfer between the two sides when the material is at different temperatures on both sides. That is, the worse the insulation performance is. Correctly obtaining the thermal conductivity of lightweight aggregate is the basis for determining the thermal insulation performance of lightweight aggregate concrete under a certain temperature field and developing high-strength lightweight aggregate concrete. At present, the main products of light coarse aggregate are clay ceramsite and shale ceramsite, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 柯杨周琴谷倩郑康高飞邓东
Owner WUHAN UNIV OF TECH
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