Method for measuring elastic modulus of lightweight aggregate

An elastic modulus, lightweight aggregate technology, applied in the intersection of building materials and micromechanics, can solve the problems of incomplete lightweight aggregates, large discrete intervals, unable to fully reflect the comprehensive information of lightweight aggregate particles, etc. Possibility of error, effect of guaranteed integrity

Active Publication Date: 2013-01-09
CCCC SECOND HIGHWAY CONSULTANTS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The formula gives the average value of the elastic modulus, but the actual discrete interval is very large
In addition, the formula only relies on one parameter: "density" to estimate the elastic modulus of light aggregate is not comprehensive, and cannot fully reflect the comprehensive information of light aggregate particles

Method used

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  • Method for measuring elastic modulus of lightweight aggregate
  • Method for measuring elastic modulus of lightweight aggregate
  • Method for measuring elastic modulus of lightweight aggregate

Examples

Experimental program
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Effect test

Embodiment 1

[0048] The bulk density is 600kg / m 3 Determination of Elastic Modulus of Clay Ceramsite

[0049] Preparation of raw materials:

[0050] Light aggregate: particle size 0-4mm, bulk density 600kg / m 3 , apparent dry density ρ a =927kg / m 3 .

[0051] Cement: Ordinary Portland cement with strength grade 52.5, relative density 3.1, specific surface area 3590cm 2 / g.

[0052] Water reducer: polycarboxylate high-efficiency water reducer (Fusle Structuro 311), pH value 5.5, dry particle ratio 25%, cement dosage 0.2-5%.

[0053] Fine aggregate: river sand, particle size 0-2mm, relative density 2.5.

[0054] A method for measuring the elastic modulus of light aggregates, the steps are:

[0055] 1) Preparation of specimens and mechanical tests to determine mechanical parameters

[0056] (1) Determine the mix ratio: when the volume ratio of light aggregate is V a =25%; 37.5%; 45%, the following table determines the mix ratio of each component material of concrete (Table 1). In ad...

Embodiment 2

[0090] The bulk density is 560kg / m 3 Determination of elastic modulus of clay ceramsite.

[0091] Preparation of raw materials:

[0092] Light aggregate: particle size 4-10mm, bulk density 560kg / m 3 , apparent dry density ρ a =921kg / m 3 .

[0093] Cement: Ordinary Portland cement with strength grade 52.5, relative density 3.1, specific surface area 3590cm 2 / g.

[0094] Fine aggregate: river sand, particle size 0-2mm, relative density 2.5.

[0095] A method for measuring the elastic modulus of light aggregates, the steps are:

[0096] 1) Preparation of specimens and mechanical tests to determine mechanical parameters

[0097] (1) Determine the mix ratio: when the volume ratio of light aggregate is V a = 25%; 37.5%; 45%, the following table determines the mix ratio of each component of concrete (Table 3). In addition, when the volume ratio of light aggregate is 0, it means cement mortar, which is not listed separately.

[0098] Table 3. Mixing ratio of cement mortar ...

Embodiment 3

[0116] The bulk density is 490kg / m 3 Elastic modulus determination of shale ceramsite.

[0117] Preparation of raw materials:

[0118] Light aggregate: particle size 4-10mm, bulk density 490kg / m 3 , apparent dry density ρ a =900kg / m 3 .

[0119] Cement: Ordinary Portland cement with strength grade 52.5, relative density 3.1, specific surface area 3590cm 2 / g.

[0120] Water reducer: polycarboxylate high-efficiency water reducer (Fusle Structuro 311), pH value 5.5, dry particle ratio 25%, cement dosage 0.2-5%,

[0121] Silica fume: relative density 2.1, specific surface area 1820cm 2 / g.

[0122] Fine aggregate: river sand, particle size 0-2mm, relative density 2.5.

[0123] A method for measuring the elastic modulus of light aggregates, the steps are:

[0124] 1) Preparation of specimens and mechanical tests to determine mechanical parameters

[0125] (a) Determine the mix ratio: when the volume ratio of light aggregate is V a = 25%; 37.5%; 45%, the following table...

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Abstract

The invention discloses a method for measuring elastic modulus of lightweight aggregate, and the method comprises the following steps of (1) determining a mix proportion of each component of cement mortar and concrete, producing a test specimen according to a standard, and determining Yang modulus of the cement mortar and the concrete; and (2) utilizing an iterative dilution model of a homogenous method to deduce the elastic modulus of the lightweight aggregate: solving a calculation value of the elastic modulus of the concrete under a volume ratio of the lightweight aggregate through the elastic modulus of the cement mortar determined in the experiment of the first step, comparing the calculation value with an experimental value of the first step, and solving a deviation. By adjusting the elastic modulus of the lightweight aggregate, the deviation is controlled within a stipulated range, and the deviation is a measurement value of the elastic modulus of the lightweight aggregate. The method is simple and convenient to operate, is particularly suitable for the situation that the particles of the aggregate are small and a traditional method for measuring the modulus cannot be used and guarantees the completeness of a measurement target; and through the measured elastic modulus of the lightweight aggregate, the elastic characteristic of the lightweight aggregate in the concrete material can be accurately reflected, and excellent test data can be provided for preparing the lightweight aggregate concrete.

Description

technical field [0001] The invention belongs to the cross field of building materials and micro-mechanics, and more specifically relates to a method for measuring the elastic modulus of light aggregates using the iterative dilution model of the homogeneous method of micro-mechanics combined with test data. The method is suitable for correctly evaluating the mechanical properties of light aggregates. performance parameters. Background technique [0002] The elastic modulus is an important performance parameter of engineering materials, which can be regarded as an index to measure the difficulty of elastic deformation of the material. The larger the value, the greater the stress that causes the material to undergo a certain elastic deformation, that is, the greater the material stiffness, that is Under a certain stress, the elastic deformation is smaller. Correctly obtaining the elastic modulus of lightweight aggregate is the basis for determining the internal stress distribu...

Claims

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Application Information

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IPC IPC(8): G01N3/08
Inventor 柯杨
Owner CCCC SECOND HIGHWAY CONSULTANTS CO LTD
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