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Method for rapid measurement of material water content and water absorption

A technology of moisture content and water absorption rate, which is applied in the field of measurement of moisture content and water absorption rate of solid materials, and can solve problems such as loss, uncertain material moisture content, and project quality hazards

Inactive Publication Date: 2014-08-20
BEIJING NELD INSTR
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AI Technical Summary

Problems solved by technology

[0007] The uncertainty of the moisture content of the material in the concrete mix ratio brings serious harm to the quality of the project, especially the national key project, which seriously endangers the national interests and the loss of safety when the structure collapses.

Method used

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  • Method for rapid measurement of material water content and water absorption

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Embodiment Construction

[0032] The content of the present invention is described as follows in conjunction with accompanying drawing:

[0033] The method is to put the water-containing test material (4) into a sealable container (1) with a known volume V, and a pressure testing device (2) is connected to the airtight container (1). When measuring, weigh the quality M of the airtight container (1) with a balance (3), then load the test material (4) and weigh the quality M1 of the airtight container (1) after the test material (4), then put the After the airtight container (1) is filled with water, weigh out the mass M2, measure the air content A% in the airtight container after it is filled with water, and then calculate the moisture content and water absorption rate of the material according to the formula.

[0034] The test data is calculated by the formula, the water content or water absorption of the material = (V-V W -A%×V-(M 测 / ρ 0 ) / [M 测 ×(1 / ρ W -1 / ρ 0 )]. Among them, V is the volume of ...

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Abstract

The invention discloses a method for rapid measurement of material water content and water absorption. Precise weighing and measurement of the gas content A% are carried out on a test material, and then the material water content and water absorption are calculated according to a formula as the following: the material water content and water absorption=(V-VW-A%*V-(Mtest / rho0) / [Mtest*(1 / rhoW-1 / rho0)]. Specifically, V is the volume of a sealed container, VW is the water volume under a finally water filled state, VW=(M2-M1) / rhoW, A% is the measured gas content, M is the mass of the sealed container, M1 is the mass of the material-loaded sealed container, M2 is the mass of the material-loaded sealed container filled with water, Mtest is the mass of the test material, Mtest=M1-M, rho0 is the density of the material under a saturated surface dry condition, and rhoW is the density of water. If the calculated data is a positive value, the data refers to the water, and if the calculated data is a negative value, the data refers to the water absorption of the test material.

Description

[0001] Field [0002] The content of the invention belongs to a rapid method for measuring the moisture content and water absorption rate of materials by the bulk density method. The invention is used for quickly measuring the moisture content and water absorption rate of solid materials (hereinafter referred to as materials) that do not change in volume after water absorption and saturation, and belongs to the technical field of solid material moisture content and water absorption rate measurement. Background technique [0003] Solid materials (hereinafter referred to as materials) generally maintain a certain water content, especially the determination of the water content of aggregates in the concrete industry is very important. [0004] For example, in the concrete mixing plant of mixed engineering, it is often seen that piles of stones, sand and other materials are placed in the open air, exposed to wind, sun and rain, and the internal and external moisture content of the...

Claims

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Application Information

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IPC IPC(8): G01N5/00
Inventor 张卉伊
Owner BEIJING NELD INSTR
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